/* roulang page: index */
:root {
            --bg: #08090f;
            --bg-soft: #0d111e;
            --panel: #111827;
            --panel-light: #162033;
            --blue: #0052ff;
            --cyan: #00f0ff;
            --cyan-soft: #9ff8ff;
            --text: #f7fbff;
            --muted: #a8b5c8;
            --line: rgba(112, 154, 218, .22);
            --line-bright: rgba(0, 240, 255, .58);
            --danger: #ff5572;
            --success: #55e6a5;
            --radius: 18px;
            --radius-sm: 12px;
            --shadow: 0 20px 70px rgba(0, 0, 0, .35);
            --glow: 0 0 28px rgba(0, 240, 255, .18);
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            color: var(--text);
            background:
                linear-gradient(rgba(8,9,15,.9), rgba(8,9,15,.98)),
                url('/assets/images/backpic/back-2.jpg') center top / cover fixed;
            font-family: "Be Vietnam Pro", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.65;
            overflow-x: hidden;
        }
        body::before {
            content: "";
            position: fixed;
            inset: 0;
            pointer-events: none;
            opacity: .16;
            background-image: linear-gradient(rgba(0,240,255,.12) 1px, transparent 1px), linear-gradient(90deg, rgba(0,240,255,.12) 1px, transparent 1px);
            background-size: 42px 42px;
            mask-image: linear-gradient(to bottom, black, transparent 80%);
        }
        a { color: inherit; text-decoration: none; transition: .25s ease; }
        img { display: block; max-width: 100%; }
        button, input { font: inherit; }
        button { cursor: pointer; }
        :focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; }
        h1, h2, h3, p { margin-top: 0; }
        h1, h2, h3 { font-family: "Space Grotesk", "Be Vietnam Pro", sans-serif; line-height: 1.16; }
        h2 { font-size: clamp(1.85rem, 3vw, 2.8rem); margin-bottom: 14px; letter-spacing: -.04em; }
        h3 { font-size: 1.12rem; margin-bottom: 9px; }
        .container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
        .section { padding: 92px 0; position: relative; }
        .section-head { max-width: 700px; margin-bottom: 38px; }
        .section-head p { color: var(--muted); max-width: 680px; margin-bottom: 0; }
        .eyebrow, .label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--cyan-soft);
            font-size: .75rem;
            font-weight: 700;
            letter-spacing: .12em;
            text-transform: uppercase;
        }
        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--cyan);
            box-shadow: 0 0 12px var(--cyan);
        }
        .muted { color: var(--muted); }

        .site-header {
            position: fixed;
            z-index: 100;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(8,9,15,.82);
            border-bottom: 1px solid rgba(0,240,255,.16);
            backdrop-filter: blur(18px);
        }
        .nav-wrap {
            min-height: 76px;
            display: flex;
            align-items: center;
            gap: 26px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 11px;
            min-width: 235px;
            font-family: "Space Grotesk", sans-serif;
            font-weight: 700;
            font-size: .98rem;
            line-height: 1.12;
        }
        .brand-mark {
            width: 38px;
            height: 38px;
            display: grid;
            place-items: center;
            color: var(--bg);
            background: linear-gradient(145deg, var(--cyan), #6b73ff);
            clip-path: polygon(18% 0, 100% 0, 82% 100%, 0 100%);
            font-weight: 800;
        }
        .main-nav { display: flex; align-items: center; gap: 5px; flex: 1; }
        .main-nav a {
            color: #b9c6d9;
            font-size: .88rem;
            padding: 9px 13px;
            border-radius: 9px;
            white-space: nowrap;
        }
        .main-nav a:hover, .main-nav a.active {
            color: var(--text);
            background: rgba(0,240,255,.09);
            box-shadow: inset 0 -2px var(--cyan);
        }
        .nav-actions { display: flex; align-items: center; gap: 8px; }
        .login-link {
            color: var(--muted);
            font-size: .86rem;
            padding: 10px 8px;
        }
        .login-link:hover { color: var(--cyan); }
        .button {
            border: 0;
            border-radius: 8px;
            padding: 12px 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            font-weight: 700;
            font-size: .9rem;
            line-height: 1.2;
            transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
        }
        .button:hover { transform: translateY(-3px); }
        .button:active { transform: translateY(1px); }
        .button-primary {
            color: #fff;
            background: linear-gradient(120deg, var(--blue), #387bff);
            box-shadow: 0 10px 26px rgba(0,82,255,.3);
        }
        .button-primary:hover { box-shadow: 0 12px 32px rgba(0,240,255,.3); }
        .button-outline {
            color: var(--cyan-soft);
            border: 1px solid var(--line-bright);
            background: rgba(0,240,255,.04);
        }
        .button-outline:hover { background: rgba(0,240,255,.12); }
        .menu-toggle {
            display: none;
            color: var(--cyan);
            background: transparent;
            border: 1px solid var(--line-bright);
            border-radius: 8px;
            padding: 7px 10px;
        }

        .hero {
            min-height: 750px;
            padding: 158px 0 80px;
            display: flex;
            align-items: center;
            background:
                linear-gradient(90deg, rgba(8,9,15,.96) 0%, rgba(8,9,15,.74) 48%, rgba(8,9,15,.86) 100%),
                url('/assets/images/backpic/back-1.jpg') center / cover;
            border-bottom: 1px solid var(--line);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: minmax(0, 1.15fr) minmax(380px, .85fr);
            gap: 70px;
            align-items: center;
        }
        .hero h1 {
            max-width: 780px;
            margin: 18px 0 23px;
            font-size: clamp(2.5rem, 5.3vw, 5.1rem);
            letter-spacing: -.065em;
        }
        .hero h1 span { color: var(--cyan); }
        .hero-copy {
            max-width: 650px;
            color: #c1ccdc;
            font-size: 1.08rem;
            line-height: 1.75;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 34px; }
        .hero-points { display: flex; flex-wrap: wrap; gap: 22px; }
        .hero-point { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: .88rem; }
        .status-dot { width: 9px; height: 9px; background: var(--success); border-radius: 50%; box-shadow: 0 0 13px var(--success); }
        .icon-matrix {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 12px;
            max-width: 480px;
            margin: 0 auto;
            transform: rotate(-3deg);
        }
        .matrix-item {
            min-height: 112px;
            padding: 18px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            background: linear-gradient(145deg, rgba(22,32,51,.9), rgba(11,20,36,.78));
            border: 1px solid var(--line);
            clip-path: polygon(7% 0, 100% 0, 93% 100%, 0 100%, 0 9%);
            box-shadow: var(--glow);
        }
        .matrix-item:nth-child(2), .matrix-item:nth-child(5) { transform: translateY(24px); border-color: rgba(0,240,255,.45); }
        .matrix-icon { color: var(--cyan); font-size: 1.65rem; font-weight: 700; }
        .matrix-item strong { font-family: "Space Grotesk"; font-size: .86rem; }
        .matrix-item small { color: var(--muted); font-size: .73rem; }
        .status-bar {
            margin-top: 35px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 15px;
            padding: 15px 18px;
            max-width: 480px;
            border-left: 3px solid var(--success);
            background: rgba(15,26,42,.75);
            color: #c7d5e5;
            font-size: .82rem;
        }
        .status-bar b { color: var(--success); }

        .progress-section { background: linear-gradient(180deg, #0d111e, #08090f); }
        .progress-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 60px; align-items: end; }
        .progress-number { font-family: "Space Grotesk"; font-size: clamp(3.5rem, 8vw, 7rem); color: var(--cyan); line-height: .95; letter-spacing: -.09em; }
        .progress-number small { font-size: 1.1rem; color: var(--muted); letter-spacing: 0; }
        .progress-track { height: 13px; margin: 25px 0 11px; background: #202b40; border-radius: 50px; overflow: hidden; }
        .progress-fill { width: 76%; height: 100%; background: linear-gradient(90deg, var(--blue), var(--cyan)); box-shadow: 0 0 18px var(--cyan); }
        .progress-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: .82rem; }
        .metric-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
        .metric { padding: 22px 0; border-top: 1px solid var(--line); }
        .metric strong { display: block; color: var(--text); font: 700 1.7rem "Space Grotesk"; }
        .metric span { color: var(--muted); font-size: .84rem; }

        .benefit-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
        .benefit {
            position: relative;
            min-height: 265px;
            padding: 29px;
            background: rgba(17,24,39,.76);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            overflow: hidden;
            transition: .28s ease;
        }
        .benefit::after {
            content: "";
            position: absolute;
            width: 150px; height: 150px;
            right: -60px; bottom: -80px;
            background: var(--blue);
            opacity: .13;
            filter: blur(25px);
        }
        .benefit:hover { transform: translateY(-7px); border-color: var(--cyan); box-shadow: var(--glow); }
        .benefit-icon { color: var(--cyan); font-size: 1.85rem; margin-bottom: 35px; }
        .benefit p { color: var(--muted); font-size: .9rem; margin-bottom: 0; }

        .tiers-section { background: #0d111e; }
        .tier-layout { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
        .tier {
            padding: 29px;
            min-height: 230px;
            border-right: 1px solid var(--line);
            position: relative;
        }
        .tier:last-child { border-right: 0; }
        .tier.featured { background: linear-gradient(145deg, rgba(0,82,255,.2), rgba(0,240,255,.05)); }
        .tier-badge { color: var(--cyan); font-size: .74rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
        .tier h3 { margin-top: 16px; }
        .tier p { color: var(--muted); font-size: .88rem; }
        .tier ul { margin: 0; padding: 0; list-style: none; color: #cbd7e7; font-size: .84rem; }
        .tier li { margin: 7px 0; }
        .tier li::before { content: "→"; color: var(--cyan); margin-right: 8px; }

        .community-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 70px; align-items: center; }
        .quote-line { padding: 22px 0; border-bottom: 1px solid var(--line); color: #d5deeb; font-size: 1.08rem; }
        .quote-line:last-child { border-bottom: 0; }
        .quote-line span { display: block; margin-top: 8px; color: var(--muted); font-size: .78rem; }
        .user-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
        .user-tile {
            aspect-ratio: 1 / 1.05;
            padding: 15px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            background: var(--panel);
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
        }
        .avatar {
            width: 42px; height: 42px; display: grid; place-items: center;
            border-radius: 50%; color: var(--bg); font-weight: 800;
            background: linear-gradient(135deg, var(--cyan), #6579ff);
        }
        .user-tile strong { font-size: .84rem; }
        .user-tile small { color: var(--success); font-size: .72rem; }

        .news-section { background: linear-gradient(180deg, #08090f, #0d111e); }
        .news-layout { display: grid; grid-template-columns: 1.4fr .6fr; gap: 42px; }
        .news-list { border-top: 1px solid var(--line); }
        .news-item {
            display: grid;
            grid-template-columns: 110px 1fr auto;
            gap: 20px;
            align-items: center;
            padding: 22px 0;
            border-bottom: 1px solid var(--line);
        }
        .news-item:hover h3 { color: var(--cyan); }
        .news-date { color: var(--cyan); font-size: .76rem; font-weight: 700; }
        .news-item h3 { font-family: "Be Vietnam Pro"; font-size: 1rem; margin: 0 0 5px; }
        .news-item p { color: var(--muted); font-size: .82rem; margin: 0; }
        .news-arrow { color: var(--cyan); font-size: 1.3rem; }
        .side-highlight {
            padding: 28px;
            min-height: 100%;
            background:
                linear-gradient(180deg, rgba(8,9,15,.1), rgba(8,9,15,.94)),
                url('/assets/images/coverpic/cover-3.jpg') center / cover;
            border-radius: var(--radius);
            border: 1px solid var(--line);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
        }
        .side-highlight p { color: #cbd6e5; font-size: .88rem; }
        .side-highlight .button { align-self: flex-start; }

        .download-section { background: #0d111e; }
        .download-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
        .app-image { height: 340px; object-fit: cover; width: 100%; border-radius: var(--radius); border: 1px solid var(--line-bright); filter: saturate(.9) contrast(1.05); }
        .steps { counter-reset: step; margin-top: 30px; }
        .step { position: relative; padding: 0 0 24px 53px; border-left: 1px solid var(--line-bright); }
        .step:last-child { border-left-color: transparent; }
        .step::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            left: -17px;
            top: -4px;
            width: 32px; height: 32px;
            display: grid; place-items: center;
            background: var(--blue); color: white;
            border: 1px solid var(--cyan);
            border-radius: 50%;
            font-weight: 800;
        }
        .step h3 { margin-bottom: 5px; }
        .step p { color: var(--muted); font-size: .86rem; margin: 0; }

        .faq-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 70px; }
        .faq-list { border-top: 1px solid var(--line); }
        .faq-item { border-bottom: 1px solid var(--line); }
        .faq-item summary {
            list-style: none;
            cursor: pointer;
            padding: 20px 40px 20px 0;
            position: relative;
            font-weight: 700;
        }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after { content: "+"; position: absolute; right: 4px; color: var(--cyan); font-size: 1.4rem; }
        .faq-item[open] summary::after { content: "−"; }
        .faq-answer { color: var(--muted); font-size: .88rem; padding: 0 30px 21px 0; }

        .cta-section { padding: 80px 0; text-align: center; background: linear-gradient(120deg, #05277b, #061b37 58%, #0d111e); }
        .cta-section h2 { max-width: 760px; margin: 0 auto 14px; }
        .cta-section p { color: #c5d4e8; max-width: 650px; margin: 0 auto 26px; }
        .countdown { display: inline-flex; align-items: center; gap: 12px; padding: 10px 15px; margin-bottom: 22px; border: 1px solid rgba(0,240,255,.4); color: var(--cyan-soft); border-radius: 8px; font-size: .8rem; }

        .site-footer { padding: 55px 0 25px; background: #05060a; border-top: 1px solid var(--line); }
        .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 35px; }
        .footer-brand { margin-bottom: 14px; }
        .footer-copy { color: var(--muted); font-size: .84rem; max-width: 360px; }
        .footer-title { color: var(--text); font-size: .86rem; font-weight: 700; margin-bottom: 14px; }
        .footer-links { list-style: none; margin: 0; padding: 0; }
        .footer-links li { margin: 7px 0; }
        .footer-links a { color: var(--muted); font-size: .82rem; }
        .footer-links a:hover { color: var(--cyan); }
        .trust-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
        .trust-badge { padding: 6px 9px; border: 1px solid var(--line); border-radius: 6px; color: #b6c5d8; font-size: .7rem; }
        .copyright { margin-top: 43px; padding-top: 20px; border-top: 1px solid var(--line); color: #718097; font-size: .75rem; display: flex; justify-content: space-between; gap: 15px; }
        .fab {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            min-width: 58px;
            min-height: 50px;
            padding: 0 16px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--cyan);
            background: rgba(0,0,0,.76);
            border: 1px solid var(--cyan);
            clip-path: polygon(10% 0, 100% 0, 90% 100%, 0 100%, 0 18%);
            box-shadow: 0 0 18px rgba(0,240,255,.45);
            animation: breathe 3s ease-in-out infinite;
        }
        .fab:hover { color: white; box-shadow: 0 0 32px rgba(0,240,255,.8); transform: scale(1.08); }
        .fab-icon { font-size: 1.25rem; }
        .fab-dot { width: 7px; height: 7px; position: absolute; top: 5px; right: 7px; background: var(--danger); border-radius: 50%; box-shadow: 0 0 10px var(--danger); animation: blink 1.5s infinite; }
        @keyframes breathe { 0%,100% { opacity: .7; } 50% { opacity: 1; } }
        @keyframes blink { 50% { opacity: .25; } }

        @media (max-width: 1024px) {
            .hero-grid { gap: 35px; }
            .brand { min-width: auto; }
            .main-nav a { padding-inline: 8px; font-size: .8rem; }
            .community-grid, .faq-layout { gap: 35px; }
        }
        @media (max-width: 768px) {
            .container { width: min(100% - 30px, 620px); }
            .nav-wrap { min-height: 68px; gap: 12px; }
            .brand { flex: 1; font-size: .85rem; }
            .brand-mark { width: 34px; height: 34px; flex: 0 0 34px; }
            .menu-toggle { display: block; }
            .main-nav {
                display: none;
                position: absolute;
                left: 15px; right: 15px; top: 70px;
                padding: 10px;
                flex-direction: column;
                align-items: stretch;
                background: rgba(13,17,30,.98);
                border: 1px solid var(--line-bright);
                border-radius: 12px;
            }
            .main-nav.open { display: flex; }
            .main-nav a { padding: 12px; }
            .nav-actions { gap: 4px; }
            .login-link { font-size: .78rem; }
            .nav-actions .button { padding: 10px 11px; font-size: .76rem; }
            .hero { min-height: auto; padding: 130px 0 70px; }
            .hero-grid, .progress-layout, .community-grid, .news-layout, .download-layout, .faq-layout { grid-template-columns: 1fr; }
            .hero-grid { gap: 55px; }
            .hero h1 { font-size: clamp(2.35rem, 11vw, 4rem); }
            .icon-matrix { max-width: 430px; }
            .section { padding: 68px 0; }
            .benefit-grid { grid-template-columns: 1fr 1fr; }
            .tier-layout { grid-template-columns: 1fr; }
            .tier { border-right: 0; border-bottom: 1px solid var(--line); }
            .tier:last-child { border-bottom: 0; }
            .news-layout { gap: 28px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 520px) {
            .container { width: calc(100% - 24px); }
            .brand { max-width: 170px; }
            .brand-mark { display: none; }
            .login-link { display: none; }
            .hero-actions, .hero-actions .button { width: 100%; }
            .hero-points { gap: 11px; flex-direction: column; }
            .icon-matrix { gap: 8px; }
            .matrix-item { min-height: 95px; padding: 13px; }
            .matrix-icon { font-size: 1.3rem; }
            .benefit-grid, .metric-list, .user-wall { grid-template-columns: 1fr 1fr; gap: 10px; }
            .benefit { min-height: 245px; padding: 20px; }
            .benefit-icon { margin-bottom: 24px; }
            .news-item { grid-template-columns: 1fr auto; gap: 4px 12px; }
            .news-date { grid-column: 1 / -1; }
            .news-item p { grid-column: 1 / -1; }
            .news-arrow { grid-row: 2; grid-column: 2; }
            .app-image { height: 245px; }
            .footer-grid { grid-template-columns: 1fr; gap: 25px; }
            .copyright { flex-direction: column; margin-top: 28px; }
            .fab { left: 12px; bottom: 78px; }
        }

/* roulang page: category1 */
:root {
            --bg: #08090f;
            --bg-soft: #0d111e;
            --panel: #111827;
            --panel-light: #162033;
            --blue: #0052ff;
            --cyan: #00f0ff;
            --cyan-soft: #9ff8ff;
            --text: #f7fbff;
            --muted: #a8b5c8;
            --line: rgba(112,154,218,.22);
            --line-bright: rgba(0,240,255,.58);
            --danger: #ff5572;
            --success: #55e6a5;
            --radius: 18px;
            --radius-sm: 12px;
            --shadow: 0 20px 70px rgba(0,0,0,.35);
            --glow: 0 0 28px rgba(0,240,255,.18);
        }

        html { scroll-behavior: smooth; }
        *, *::before, *::after { box-sizing: border-box; }
        body {
            margin: 0;
            color: var(--text);
            background:
                linear-gradient(rgba(8,9,15,.92), rgba(8,9,15,.98)),
                url('/assets/images/backpic/back-2.jpg') center top / cover fixed;
            font-family: "Be Vietnam Pro", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.65;
            overflow-x: hidden;
        }
        body::before {
            content: "";
            position: fixed;
            inset: 0;
            pointer-events: none;
            opacity: .16;
            background-image:
                linear-gradient(rgba(0,240,255,.12) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0,240,255,.12) 1px, transparent 1px);
            background-size: 42px 42px;
            mask-image: linear-gradient(to bottom, black, transparent 80%);
        }
        a { color: inherit; text-decoration: none; transition: .25s ease; }
        img { display: block; max-width: 100%; }
        button, input { font: inherit; }
        button { cursor: pointer; }
        h1, h2, h3, p { margin-top: 0; }
        h1, h2, h3 { font-family: "Space Grotesk", sans-serif; line-height: 1.12; }
        h2 { font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -.045em; margin-bottom: 16px; }
        h3 { font-size: 1.25rem; margin-bottom: 10px; }
        .container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
        .section { padding: 96px 0; position: relative; }
        .section-head { max-width: 720px; margin-bottom: 42px; }
        .section-head p { color: var(--muted); max-width: 680px; margin-bottom: 0; }
        .eyebrow, .label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--cyan-soft);
            font-size: .74rem;
            font-weight: 700;
            letter-spacing: .12em;
            text-transform: uppercase;
        }
        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--cyan);
            box-shadow: 0 0 12px var(--cyan);
        }
        .muted { color: var(--muted); }

        .site-header {
            position: fixed;
            z-index: 100;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(8,9,15,.84);
            border-bottom: 1px solid rgba(0,240,255,.16);
            backdrop-filter: blur(18px);
        }
        .nav-wrap {
            min-height: 76px;
            display: flex;
            align-items: center;
            gap: 26px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 11px;
            min-width: 235px;
            font-family: "Space Grotesk", sans-serif;
            font-weight: 700;
            font-size: .98rem;
            line-height: 1.12;
        }
        .brand-mark {
            width: 38px;
            height: 38px;
            display: grid;
            place-items: center;
            flex: 0 0 38px;
            color: var(--bg);
            background: linear-gradient(145deg, var(--cyan), #6b73ff);
            clip-path: polygon(18% 0, 100% 0, 82% 100%, 0 100%);
            font-weight: 800;
        }
        .main-nav { display: flex; align-items: center; gap: 5px; flex: 1; }
        .main-nav a {
            color: #b9c6d9;
            font-size: .87rem;
            padding: 9px 13px;
            border-radius: 9px;
            white-space: nowrap;
        }
        .main-nav a:hover, .main-nav a.active {
            color: var(--text);
            background: rgba(0,240,255,.09);
            box-shadow: inset 0 -2px var(--cyan);
        }
        .nav-actions { display: flex; align-items: center; gap: 8px; }
        .button {
            border: 0;
            border-radius: 8px;
            padding: 12px 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            font-weight: 700;
            font-size: .9rem;
            line-height: 1.2;
            transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
        }
        .button:hover { transform: translateY(-3px); }
        .button:active { transform: translateY(1px); }
        .button:focus-visible, a:focus-visible, button:focus-visible {
            outline: 3px solid rgba(0,240,255,.6);
            outline-offset: 3px;
        }
        .button-primary {
            color: #fff;
            background: linear-gradient(120deg, var(--blue), #387bff);
            box-shadow: 0 10px 26px rgba(0,82,255,.3);
        }
        .button-primary:hover { box-shadow: 0 12px 32px rgba(0,240,255,.3); }
        .button-outline {
            color: var(--cyan-soft);
            border: 1px solid var(--line-bright);
            background: rgba(0,240,255,.04);
        }
        .button-outline:hover { background: rgba(0,240,255,.12); }
        .button-ghost { color: var(--cyan-soft); padding-inline: 10px; }
        .menu-toggle {
            display: none;
            color: var(--cyan);
            background: transparent;
            border: 1px solid var(--line-bright);
            border-radius: 8px;
            padding: 7px 10px;
        }

        .inner-hero {
            min-height: 570px;
            padding: 150px 0 82px;
            display: flex;
            align-items: center;
            background:
                linear-gradient(90deg, rgba(8,9,15,.96), rgba(8,9,15,.72)),
                url('/assets/images/backpic/back-1.jpg') center / cover;
            border-bottom: 1px solid var(--line);
        }
        .inner-hero-grid {
            display: grid;
            grid-template-columns: minmax(0, 5fr) minmax(320px, 7fr);
            align-items: center;
            gap: 54px;
        }
        .inner-hero-copy { position: relative; z-index: 2; }
        .inner-hero h1 {
            max-width: 700px;
            margin: 17px 0 22px;
            font-size: clamp(2.35rem, 5vw, 4.7rem);
            letter-spacing: -.065em;
        }
        .inner-hero h1 span { color: var(--cyan); }
        .lead {
            color: #c1ccdc;
            font-size: 1.06rem;
            line-height: 1.78;
            max-width: 650px;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
        .hero-media {
            position: relative;
            transform: translate(22px, 24px) skewY(-2deg);
            border: 1px solid var(--line-bright);
            box-shadow: var(--shadow), 0 0 40px rgba(0,240,255,.18);
            overflow: hidden;
            background: var(--panel);
        }
        .hero-media::before {
            content: "";
            position: absolute;
            inset: 0;
            z-index: 1;
            background: linear-gradient(135deg, rgba(0,240,255,.18), transparent 44%, rgba(0,82,255,.34));
            pointer-events: none;
        }
        .hero-media img { width: 100%; height: 390px; object-fit: cover; filter: saturate(1.1) contrast(1.05); }
        .media-caption {
            position: absolute;
            z-index: 2;
            right: 18px;
            bottom: 18px;
            max-width: 245px;
            padding: 14px 16px;
            color: #e8fdff;
            background: rgba(8,9,15,.78);
            border-left: 2px solid var(--cyan);
            backdrop-filter: blur(10px);
            font-size: .84rem;
            line-height: 1.45;
        }
        .hero-stats {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            margin-top: 32px;
        }
        .stat strong {
            display: block;
            color: var(--cyan);
            font: 700 1.65rem/1 "Space Grotesk", sans-serif;
        }
        .stat span { color: var(--muted); font-size: .78rem; }

        .intro-layout {
            display: grid;
            grid-template-columns: .9fr 1.1fr;
            gap: 70px;
            align-items: start;
        }
        .intro-layout h2 { max-width: 470px; }
        .intro-text p { color: var(--muted); margin-bottom: 18px; }
        .signal-list { list-style: none; margin: 0; padding: 0; }
        .signal-list li {
            display: flex;
            gap: 16px;
            padding: 19px 0;
            border-bottom: 1px solid var(--line);
        }
        .signal-list li:first-child { border-top: 1px solid var(--line); }
        .signal-icon {
            width: 34px;
            height: 34px;
            flex: 0 0 34px;
            display: grid;
            place-items: center;
            color: var(--bg);
            background: var(--cyan);
            clip-path: polygon(15% 0,100% 0,85% 100%,0 100%);
            font-weight: 800;
        }
        .signal-list strong { display: block; margin-bottom: 3px; }
        .signal-list span { color: var(--muted); font-size: .9rem; }

        .dark-band {
            background: linear-gradient(110deg, rgba(13,17,30,.94), rgba(17,24,39,.72));
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }
        .benefit-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }
        .benefit {
            min-height: 218px;
            padding: 26px;
            background: rgba(17,24,39,.72);
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
            transition: .3s ease;
        }
        .benefit:hover {
            transform: translateY(-6px);
            border-color: var(--cyan);
            box-shadow: var(--glow);
        }
        .benefit-number {
            color: var(--cyan);
            font: 700 1rem/1 "Space Grotesk", sans-serif;
            letter-spacing: .08em;
        }
        .benefit h3 { margin-top: 24px; }
        .benefit p { color: var(--muted); font-size: .92rem; margin-bottom: 0; }

        .steps-layout {
            display: grid;
            grid-template-columns: 1.05fr .95fr;
            gap: 64px;
            align-items: center;
        }
        .step-list { list-style: none; margin: 0; padding: 0; }
        .step-list li {
            position: relative;
            display: grid;
            grid-template-columns: 54px 1fr;
            gap: 18px;
            padding: 0 0 30px;
        }
        .step-list li:not(:last-child)::after {
            content: "";
            position: absolute;
            top: 48px;
            left: 25px;
            width: 1px;
            height: calc(100% - 38px);
            background: linear-gradient(var(--cyan), transparent);
        }
        .step-no {
            width: 50px;
            height: 50px;
            display: grid;
            place-items: center;
            color: var(--cyan);
            border: 1px solid var(--cyan);
            background: var(--bg);
            border-radius: 50%;
            font: 700 1.05rem "Space Grotesk", sans-serif;
            box-shadow: 0 0 18px rgba(0,240,255,.17);
        }
        .step-list h3 { margin: 5px 0 6px; }
        .step-list p { color: var(--muted); font-size: .91rem; margin-bottom: 0; }
        .download-panel {
            position: relative;
            padding: 34px;
            background: linear-gradient(145deg, rgba(0,82,255,.22), rgba(0,240,255,.04));
            border: 1px solid var(--line-bright);
            clip-path: polygon(0 0, 94% 0, 100% 13%, 100% 100%, 6% 100%, 0 87%);
        }
        .download-panel img { height: 250px; width: 100%; object-fit: cover; margin-bottom: 28px; opacity: .86; }
        .download-panel h3 { font-size: 1.5rem; }
        .download-panel p { color: var(--muted); }
        .device-tags { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
        .tag {
            display: inline-flex;
            align-items: center;
            padding: 7px 11px;
            border: 1px solid var(--line-bright);
            border-radius: 999px;
            color: var(--cyan-soft);
            background: rgba(0,240,255,.06);
            font-size: .78rem;
        }

        .scenario-section { background: rgba(8,9,15,.45); }
        .scenario-layout {
            display: grid;
            grid-template-columns: 1.2fr .8fr;
            gap: 52px;
        }
        .scenario-table { border-top: 1px solid var(--line); }
        .scenario-row {
            display: grid;
            grid-template-columns: 1fr 1.3fr;
            gap: 20px;
            padding: 21px 0;
            border-bottom: 1px solid var(--line);
        }
        .scenario-row strong { color: var(--text); }
        .scenario-row span { color: var(--muted); font-size: .9rem; }
        .note-block {
            padding: 26px;
            border-left: 3px solid var(--success);
            background: rgba(85,230,165,.06);
        }
        .note-block .label { color: var(--success); }
        .note-block p { color: #c4d5d2; font-size: .92rem; margin: 18px 0 0; }

        .proof-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1px;
            background: var(--line);
            border: 1px solid var(--line);
        }
        .proof-item { padding: 25px 22px; background: rgba(13,17,30,.9); }
        .proof-item strong {
            display: block;
            color: var(--cyan);
            font: 700 1.8rem/1.1 "Space Grotesk", sans-serif;
            margin-bottom: 8px;
        }
        .proof-item span { color: var(--muted); font-size: .84rem; }

        .faq-wrap {
            display: grid;
            grid-template-columns: .72fr 1.28fr;
            gap: 64px;
            align-items: start;
        }
        .faq-wrap > div:first-child p { color: var(--muted); }
        .accordion {
            margin: 0;
            background: transparent;
            border: 0;
        }
        .accordion-item {
            background: rgba(17,24,39,.58);
            border: 1px solid var(--line);
            margin-bottom: 12px;
            border-radius: var(--radius-sm);
            overflow: hidden;
        }
        .accordion-title {
            color: var(--text);
            border: 0;
            padding: 20px 24px;
            font-size: .98rem;
            font-weight: 700;
        }
        .accordion-title:hover { color: var(--cyan); background: rgba(0,240,255,.05); }
        .accordion-content {
            color: var(--muted);
            background: rgba(8,9,15,.55);
            border-top: 1px solid var(--line);
            padding: 16px 24px 20px;
            font-size: .92rem;
        }
        .accordion-title::before { color: var(--cyan); }

        .cta-section { padding: 80px 0 96px; }
        .cta-box {
            position: relative;
            overflow: hidden;
            display: grid;
            grid-template-columns: 1.3fr .7fr;
            gap: 30px;
            align-items: center;
            padding: 48px 54px;
            background:
                linear-gradient(110deg, rgba(0,82,255,.7), rgba(0,240,255,.13)),
                url('/assets/images/backpic/back-3.jpg') center / cover;
            border: 1px solid rgba(0,240,255,.7);
            box-shadow: var(--shadow), var(--glow);
        }
        .cta-box::after {
            content: "TX";
            position: absolute;
            right: 35px;
            bottom: -45px;
            color: rgba(255,255,255,.08);
            font: 800 13rem/1 "Space Grotesk", sans-serif;
        }
        .cta-box h2 { position: relative; z-index: 1; max-width: 650px; margin-bottom: 12px; }
        .cta-box p { position: relative; z-index: 1; color: #d9faff; max-width: 620px; margin-bottom: 0; }
        .cta-action { position: relative; z-index: 2; display: flex; justify-content: flex-end; }

        .site-footer {
            padding: 68px 0 24px;
            background: rgba(5,7,12,.95);
            border-top: 1px solid var(--line);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr repeat(3, 1fr);
            gap: 38px;
        }
        .footer-brand { min-width: 0; margin-bottom: 19px; }
        .footer-copy { max-width: 350px; color: var(--muted); font-size: .88rem; }
        .trust-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 20px; }
        .trust-badge {
            color: var(--cyan-soft);
            border: 1px solid var(--line);
            padding: 6px 9px;
            border-radius: 6px;
            font-size: .7rem;
        }
        .footer-title {
            margin-bottom: 18px;
            color: var(--text);
            font: 700 1rem "Space Grotesk", sans-serif;
        }
        .footer-links { list-style: none; margin: 0; padding: 0; }
        .footer-links li { margin-bottom: 10px; }
        .footer-links a { color: var(--muted); font-size: .86rem; }
        .footer-links a:hover { color: var(--cyan); padding-left: 4px; }
        .copyright {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            margin-top: 48px;
            padding-top: 20px;
            border-top: 1px solid var(--line);
            color: #718098;
            font-size: .76rem;
        }

        .fab {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            min-width: 58px;
            min-height: 58px;
            display: flex;
            align-items: center;
            gap: 9px;
            padding: 0 16px;
            color: var(--cyan);
            background: rgba(0,0,0,.72);
            border: 1px solid var(--cyan);
            box-shadow: 0 0 15px rgba(0,240,255,.5);
            clip-path: polygon(10% 0,100% 0,90% 100%,0 100%);
            font-size: .78rem;
            font-weight: 700;
            opacity: .72;
            animation: float 3s ease-in-out infinite;
        }
        .fab:hover { opacity: 1; transform: scale(1.08); box-shadow: 0 0 30px rgba(0,240,255,.75); }
        .fab:active { transform: scale(.95); }
        .fab-icon { font-size: 1.25rem; animation: flicker 2.8s infinite; }
        .fab-dot {
            position: absolute;
            top: 5px;
            right: 6px;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--danger);
            box-shadow: 0 0 10px var(--danger);
        }
        @keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
        @keyframes flicker { 0%,90%,100% { opacity: 1; } 93% { opacity: .38; } }

        @media (max-width: 1024px) {
            .nav-wrap { gap: 14px; }
            .brand { min-width: 205px; font-size: .88rem; }
            .main-nav a { padding-inline: 8px; font-size: .8rem; }
            .inner-hero-grid { gap: 32px; }
            .hero-media { transform: translate(0, 16px) skewY(-2deg); }
            .footer-grid { grid-template-columns: 1.3fr repeat(3, 1fr); gap: 22px; }
        }
        @media (max-width: 768px) {
            .container { width: min(100% - 32px, 620px); }
            .section { padding: 70px 0; }
            .nav-wrap { min-height: 68px; justify-content: space-between; }
            .brand { min-width: auto; max-width: 215px; }
            .menu-toggle { display: block; }
            .main-nav {
                position: absolute;
                top: 68px;
                left: 16px;
                right: 16px;
                display: none;
                flex-direction: column;
                align-items: stretch;
                padding: 10px;
                background: rgba(13,17,30,.98);
                border: 1px solid var(--line-bright);
                box-shadow: var(--shadow);
            }
            .main-nav.is-open { display: flex; }
            .main-nav a { padding: 12px 14px; }
            .nav-actions { gap: 3px; }
            .nav-actions .button { padding: 10px 11px; font-size: .76rem; }
            .inner-hero { min-height: auto; padding: 125px 0 72px; }
            .inner-hero-grid, .intro-layout, .steps-layout, .scenario-layout, .faq-wrap, .cta-box {
                grid-template-columns: 1fr;
                gap: 35px;
            }
            .inner-hero h1 { font-size: clamp(2.25rem, 9vw, 3.7rem); }
            .hero-media { order: -1; transform: none; }
            .hero-media img { height: 290px; }
            .benefit-grid { grid-template-columns: 1fr 1fr; }
            .proof-strip { grid-template-columns: 1fr 1fr; }
            .cta-box { padding: 35px 28px; }
            .cta-action { justify-content: flex-start; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid > div:first-child { grid-column: 1 / -1; }
            .copyright { flex-direction: column; gap: 7px; margin-top: 35px; }
        }
        @media (max-width: 520px) {
            body { font-size: 15px; }
            .container { width: min(100% - 24px, 460px); }
            .brand { font-size: .78rem; gap: 7px; }
            .brand-mark { width: 32px; height: 32px; flex-basis: 32px; font-size: .8rem; }
            .nav-actions .button-ghost { display: none; }
            .nav-actions .button { padding: 9px 10px; }
            .inner-hero { padding-top: 112px; }
            .inner-hero h1 { font-size: 2.35rem; }
            .lead { font-size: .98rem; }
            .hero-actions .button { width: 100%; }
            .hero-stats { gap: 17px; }
            .benefit-grid, .proof-strip, .footer-grid { grid-template-columns: 1fr; }
            .footer-grid > div:first-child { grid-column: auto; }
            .scenario-row { grid-template-columns: 1fr; gap: 4px; }
            .download-panel { padding: 23px; }
            .download-panel img { height: 210px; }
            .cta-box h2 { font-size: 2rem; }
            .fab { left: 12px; bottom: 78px; min-width: 52px; min-height: 52px; padding: 0 13px; }
            .fab-text { display: none; }
        }

/* roulang page: article */
:root {
            --bg: #08090f;
            --bg-soft: #0d111e;
            --panel: #111827;
            --panel-light: #162033;
            --blue: #0052ff;
            --blue-deep: #123ca5;
            --cyan: #00f0ff;
            --cyan-soft: #9ff8ff;
            --text: #f7fbff;
            --muted: #a8b5c8;
            --line: rgba(112, 154, 218, .22);
            --line-bright: rgba(0, 240, 255, .58);
            --danger: #ff5572;
            --success: #55e6a5;
            --radius: 18px;
            --radius-sm: 12px;
            --shadow: 0 20px 70px rgba(0, 0, 0, .35);
            --glow: 0 0 28px rgba(0, 240, 255, .18);
        }

        html {
            scroll-behavior: smooth;
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            color: var(--text);
            background:
                linear-gradient(rgba(8,9,15,.92), rgba(8,9,15,.98)),
                url('/assets/images/backpic/back-2.jpg') center top / cover fixed;
            font-family: "Be Vietnam Pro", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.65;
            overflow-x: hidden;
        }

        body::before {
            content: "";
            position: fixed;
            inset: 0;
            pointer-events: none;
            opacity: .14;
            background-image:
                linear-gradient(rgba(0,240,255,.12) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0,240,255,.12) 1px, transparent 1px);
            background-size: 42px 42px;
            mask-image: linear-gradient(to bottom, black, transparent 80%);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: .25s ease;
        }

        img {
            display: block;
            max-width: 100%;
        }

        button,
        input {
            font: inherit;
        }

        button {
            cursor: pointer;
        }

        .container {
            width: min(1180px, calc(100% - 40px));
            margin-inline: auto;
        }

        .section {
            position: relative;
            padding: 92px 0;
        }

        .section-head {
            max-width: 740px;
            margin-bottom: 38px;
        }

        .section-head p {
            color: var(--muted);
            max-width: 680px;
            margin: 10px 0 0;
        }

        .eyebrow,
        .label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--cyan-soft);
            font-size: .75rem;
            font-weight: 700;
            letter-spacing: .12em;
            text-transform: uppercase;
        }

        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--cyan);
            box-shadow: 0 0 12px var(--cyan);
        }

        .muted {
            color: var(--muted);
        }

        h1,
        h2,
        h3,
        h4 {
            font-family: "Space Grotesk", "Be Vietnam Pro", sans-serif;
            line-height: 1.14;
            letter-spacing: -.035em;
        }

        h1,
        h2,
        h3,
        p {
            margin-top: 0;
        }

        h2 {
            font-size: clamp(2rem, 4vw, 3.45rem);
            margin-bottom: 0;
        }

        h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
        }

        .site-header {
            position: fixed;
            z-index: 100;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(8,9,15,.84);
            border-bottom: 1px solid rgba(0,240,255,.16);
            backdrop-filter: blur(18px);
        }

        .nav-wrap {
            min-height: 76px;
            display: flex;
            align-items: center;
            gap: 24px;
        }

        .brand {
            display: inline-flex;
            align-items: center;
            gap: 11px;
            min-width: 235px;
            font-family: "Space Grotesk", sans-serif;
            font-weight: 700;
            font-size: .98rem;
            line-height: 1.12;
        }

        .brand:hover {
            color: var(--cyan-soft);
        }

        .brand-mark {
            width: 38px;
            height: 38px;
            display: grid;
            place-items: center;
            color: var(--bg);
            background: linear-gradient(145deg, var(--cyan), #6b73ff);
            clip-path: polygon(18% 0, 100% 0, 82% 100%, 0 100%);
            font-weight: 800;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 5px;
            flex: 1;
        }

        .main-nav a {
            color: #b9c6d9;
            font-size: .88rem;
            padding: 9px 13px;
            border-radius: 9px;
            white-space: nowrap;
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text);
            background: rgba(0,240,255,.09);
            box-shadow: inset 0 -2px var(--cyan);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }

        .nav-login {
            color: var(--cyan-soft);
            padding: 10px 10px;
            font-size: .86rem;
            font-weight: 700;
        }

        .nav-login:hover {
            color: #fff;
        }

        .button {
            border: 0;
            border-radius: 8px;
            padding: 12px 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            font-weight: 700;
            font-size: .9rem;
            line-height: 1.2;
            transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
        }

        .button:hover {
            transform: translateY(-3px);
        }

        .button:active {
            transform: translateY(1px);
        }

        .button:focus-visible,
        .menu-toggle:focus-visible,
        .video-play:focus-visible,
        summary:focus-visible {
            outline: 3px solid rgba(0,240,255,.45);
            outline-offset: 3px;
        }

        .button-primary {
            color: #fff;
            background: linear-gradient(120deg, var(--blue), #387bff);
            box-shadow: 0 10px 26px rgba(0,82,255,.3);
        }

        .button-primary:hover {
            box-shadow: 0 12px 32px rgba(0,240,255,.3);
        }

        .button-outline {
            color: var(--cyan-soft);
            border: 1px solid var(--line-bright);
            background: rgba(0,240,255,.04);
        }

        .button-outline:hover {
            color: #fff;
            background: rgba(0,240,255,.12);
        }

        .menu-toggle {
            display: none;
            color: var(--cyan);
            background: transparent;
            border: 1px solid var(--line-bright);
            border-radius: 8px;
            padding: 7px 10px;
        }

        .article-hero {
            position: relative;
            min-height: 600px;
            padding: 158px 0 80px;
            display: flex;
            align-items: center;
            overflow: hidden;
            background:
                linear-gradient(90deg, rgba(8,9,15,.97) 0%, rgba(8,9,15,.76) 48%, rgba(8,9,15,.9) 100%),
                url('/assets/images/backpic/back-1.jpg') center / cover;
            border-bottom: 1px solid var(--line);
        }

        .article-hero::after {
            content: "";
            position: absolute;
            width: 440px;
            height: 440px;
            right: -130px;
            top: 80px;
            border-radius: 50%;
            background: rgba(0,240,255,.13);
            filter: blur(70px);
            pointer-events: none;
        }

        .hero-grid {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: minmax(0, 1.03fr) minmax(360px, .97fr);
            align-items: center;
            gap: 70px;
        }

        .crumbs {
            display: flex;
            flex-wrap: wrap;
            gap: 9px;
            align-items: center;
            color: var(--muted);
            font-size: .82rem;
            margin-bottom: 22px;
        }

        .crumbs a:hover {
            color: var(--cyan);
        }

        .crumbs span {
            color: rgba(168,181,200,.5);
        }

        .article-hero h1 {
            max-width: 760px;
            font-size: clamp(2.45rem, 5vw, 4.75rem);
            margin: 0 0 22px;
        }

        .article-hero h1 span {
            color: var(--cyan);
        }

        .hero-summary {
            max-width: 690px;
            color: #c5d0df;
            font-size: 1.08rem;
            line-height: 1.75;
            margin-bottom: 28px;
        }

        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            color: var(--muted);
            font-size: .84rem;
        }

        .hero-meta strong {
            color: var(--text);
            font-weight: 600;
        }

        .video-stage {
            position: relative;
            min-height: 360px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(0,240,255,.42);
            border-radius: 22px;
            overflow: hidden;
            background:
                linear-gradient(135deg, rgba(0,82,255,.28), rgba(0,0,0,.6)),
                url('/assets/images/coverpic/cover-6.jpg') center / cover;
            box-shadow: var(--shadow), var(--glow);
        }

        .video-stage::before {
            content: "";
            position: absolute;
            inset: 16px;
            border: 1px solid rgba(159,248,255,.24);
            border-radius: 15px;
            pointer-events: none;
        }

        .video-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(8,9,15,.08), rgba(8,9,15,.78));
        }

        .video-caption {
            position: absolute;
            left: 27px;
            right: 27px;
            bottom: 23px;
            display: flex;
            align-items: end;
            justify-content: space-between;
            gap: 20px;
            z-index: 2;
        }

        .video-caption small {
            display: block;
            color: var(--cyan-soft);
            font-size: .72rem;
            letter-spacing: .11em;
            text-transform: uppercase;
            margin-bottom: 5px;
        }

        .video-caption strong {
            display: block;
            font-family: "Space Grotesk", sans-serif;
            font-size: 1.1rem;
        }

        .video-play {
            position: relative;
            z-index: 3;
            width: 76px;
            height: 76px;
            border: 1px solid var(--cyan);
            border-radius: 50%;
            display: grid;
            place-items: center;
            color: var(--bg);
            background: var(--cyan);
            box-shadow: 0 0 0 10px rgba(0,240,255,.12), 0 0 34px rgba(0,240,255,.55);
            transition: transform .25s ease, box-shadow .25s ease;
        }

        .video-play:hover {
            transform: scale(1.08);
            box-shadow: 0 0 0 15px rgba(0,240,255,.12), 0 0 44px rgba(0,240,255,.7);
        }

        .video-play svg {
            width: 27px;
            height: 27px;
            margin-left: 4px;
            fill: currentColor;
        }

        .article-shell {
            padding: 74px 0 40px;
        }

        .article-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 310px;
            gap: 48px;
            align-items: start;
        }

        .article-content {
            min-width: 0;
            padding: 4px 0 28px;
        }

        .article-content > p:first-child {
            color: #d9e3ef;
            font-size: 1.15rem;
            line-height: 1.8;
        }

        .article-content h2 {
            font-size: clamp(1.65rem, 3vw, 2.4rem);
            margin: 42px 0 14px;
            padding-top: 28px;
            border-top: 1px solid var(--line);
        }

        .article-content h3 {
            color: var(--cyan-soft);
            margin: 30px 0 10px;
        }

        .article-content p,
        .article-content li {
            color: #bdc9d9;
        }

        .article-content ul,
        .article-content ol {
            padding-left: 23px;
            margin-bottom: 24px;
        }

        .article-content li {
            margin-bottom: 9px;
        }

        .article-content a {
            color: var(--cyan-soft);
            text-decoration: underline;
            text-decoration-color: rgba(0,240,255,.4);
            text-underline-offset: 4px;
        }

        .article-content a:hover {
            color: #fff;
        }

        .article-content blockquote {
            margin: 30px 0;
            padding: 22px 25px;
            border-left: 3px solid var(--cyan);
            background: rgba(0,240,255,.06);
            color: #e6faff;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        }

        .article-content img {
            width: 100%;
            border-radius: var(--radius);
            border: 1px solid var(--line);
            margin: 28px 0;
        }

        .article-aside {
            position: sticky;
            top: 98px;
        }

        .aside-panel {
            padding: 24px;
            background: rgba(17,24,39,.83);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }

        .aside-panel + .aside-panel {
            margin-top: 16px;
        }

        .aside-panel h3 {
            margin-bottom: 17px;
        }

        .aside-image {
            height: 150px;
            margin: -24px -24px 22px;
            border-radius: var(--radius) var(--radius-sm) 0 0;
            background: url('/assets/images/coverpic/cover-4.jpg') center / cover;
            border-bottom: 1px solid var(--line);
        }

        .check-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .check-list li {
            display: flex;
            gap: 10px;
            align-items: flex-start;
            color: var(--muted);
            font-size: .9rem;
            padding: 10px 0;
            border-bottom: 1px solid rgba(112,154,218,.13);
        }

        .check-list li:last-child {
            border-bottom: 0;
            padding-bottom: 0;
        }

        .check-list span {
            flex: 0 0 20px;
            height: 20px;
            display: grid;
            place-items: center;
            border-radius: 50%;
            color: var(--bg);
            background: var(--success);
            font-size: .72rem;
            font-weight: 800;
        }

        .support-note {
            color: var(--muted);
            font-size: .88rem;
            margin-bottom: 17px;
        }

        .article-strip {
            padding: 30px 0 84px;
        }

        .strip-inner {
            display: grid;
            grid-template-columns: 1.2fr .8fr;
            gap: 24px;
            align-items: stretch;
        }

        .topic-banner,
        .payment-banner {
            min-height: 190px;
            padding: 31px;
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: linear-gradient(120deg, rgba(17,24,39,.96), rgba(13,17,30,.76));
        }

        .topic-banner {
            background:
                linear-gradient(90deg, rgba(13,17,30,.94), rgba(13,17,30,.55)),
                url('/assets/images/coverpic/cover-2.jpg') center / cover;
        }

        .topic-banner h2,
        .payment-banner h2 {
            font-size: 1.65rem;
            margin: 10px 0 11px;
        }

        .topic-banner p,
        .payment-banner p {
            color: var(--muted);
            max-width: 570px;
            margin-bottom: 20px;
        }

        .payment-list {
            display: flex;
            flex-wrap: wrap;
            gap: 9px;
            margin-top: 18px;
        }

        .payment-list span,
        .trust-badge,
        .category-badge {
            display: inline-flex;
            align-items: center;
            min-height: 30px;
            padding: 6px 10px;
            border: 1px solid rgba(0,240,255,.25);
            border-radius: 7px;
            color: var(--cyan-soft);
            background: rgba(0,240,255,.06);
            font-size: .75rem;
            font-weight: 700;
        }

        .faq-section {
            padding: 70px 0 86px;
            background: rgba(13,17,30,.62);
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }

        .faq-grid {
            display: grid;
            grid-template-columns: .75fr 1.25fr;
            gap: 68px;
            align-items: start;
        }

        .faq-intro p {
            color: var(--muted);
            margin: 16px 0 23px;
        }

        .faq-list details {
            border-bottom: 1px solid var(--line);
            padding: 0;
        }

        .faq-list details:first-child {
            border-top: 1px solid var(--line);
        }

        .faq-list summary {
            list-style: none;
            position: relative;
            padding: 20px 38px 20px 0;
            color: var(--text);
            font-weight: 700;
            cursor: pointer;
        }

        .faq-list summary::-webkit-details-marker {
            display: none;
        }

        .faq-list summary::after {
            content: "+";
            position: absolute;
            right: 4px;
            top: 15px;
            color: var(--cyan);
            font-size: 1.55rem;
            font-weight: 400;
        }

        .faq-list details[open] summary::after {
            content: "−";
        }

        .faq-answer {
            color: var(--muted);
            padding: 0 38px 20px 0;
            font-size: .94rem;
        }

        .cta-section {
            padding: 84px 0;
            text-align: center;
        }

        .cta-box {
            position: relative;
            overflow: hidden;
            padding: 58px 30px;
            border: 1px solid var(--line-bright);
            border-radius: 24px;
            background:
                linear-gradient(110deg, rgba(0,82,255,.24), rgba(0,240,255,.07)),
                rgba(17,24,39,.82);
            box-shadow: var(--glow);
        }

        .cta-box::before,
        .cta-box::after {
            content: "";
            position: absolute;
            width: 180px;
            height: 180px;
            border: 1px solid rgba(0,240,255,.2);
            transform: rotate(45deg);
        }

        .cta-box::before {
            left: -100px;
            top: -80px;
        }

        .cta-box::after {
            right: -100px;
            bottom: -80px;
        }

        .cta-box > * {
            position: relative;
            z-index: 1;
        }

        .cta-box h2 {
            max-width: 760px;
            margin: 10px auto 14px;
            font-size: clamp(2rem, 4vw, 3.1rem);
        }

        .cta-box p {
            max-width: 680px;
            color: var(--muted);
            margin: 0 auto 25px;
        }

        .cta-actions {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 12px;
        }

        .site-footer {
            padding: 65px 0 25px;
            background: #06070c;
            border-top: 1px solid var(--line);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.45fr .8fr .95fr 1fr;
            gap: 35px;
        }

        .footer-brand {
            min-width: 0;
            margin-bottom: 17px;
        }

        .footer-copy {
            max-width: 390px;
            color: var(--muted);
            font-size: .88rem;
            line-height: 1.7;
        }

        .trust-row {
            display: flex;
            flex-wrap: wrap;
            gap: 7px;
            margin-top: 19px;
        }

        .trust-badge {
            font-size: .68rem;
            border-color: rgba(85,230,165,.28);
            color: #a7f5d2;
            background: rgba(85,230,165,.06);
        }

        .footer-title {
            color: var(--text);
            font-family: "Space Grotesk", sans-serif;
            font-size: .93rem;
            font-weight: 700;
            margin: 5px 0 16px;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: var(--muted);
            font-size: .86rem;
        }

        .footer-links a:hover {
            color: var(--cyan);
            padding-left: 4px;
        }

        .copyright {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            padding-top: 27px;
            margin-top: 40px;
            border-top: 1px solid rgba(112,154,218,.15);
            color: #77869d;
            font-size: .77rem;
        }

        .fab-support {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            width: 58px;
            height: 48px;
            display: grid;
            place-items: center;
            color: var(--cyan);
            background: rgba(0,0,0,.72);
            border: 1px solid var(--cyan);
            clip-path: polygon(10% 0, 100% 0, 90% 100%, 0 100%);
            box-shadow: 0 0 18px rgba(0,240,255,.45);
            opacity: .72;
            transition: .25s ease;
        }

        .fab-support:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(0,240,255,.7);
        }

        .fab-support svg {
            width: 23px;
            height: 23px;
            fill: none;
            stroke: currentColor;
            stroke-width: 1.8;
        }

        .fab-dot {
            position: absolute;
            width: 8px;
            height: 8px;
            top: 5px;
            right: 7px;
            border-radius: 50%;
            background: var(--danger);
            box-shadow: 0 0 11px var(--danger);
        }

        .modal-backdrop {
            display: none;
            position: fixed;
            z-index: 200;
            inset: 0;
            align-items: center;
            justify-content: center;
            padding: 20px;
            background: rgba(2,4,10,.82);
            backdrop-filter: blur(12px);
        }

        .modal-backdrop.is-visible {
            display: flex;
        }

        .video-modal {
            position: relative;
            width: min(680px, 100%);
            padding: 34px;
            border: 1px solid var(--line-bright);
            border-radius: var(--radius);
            background: var(--panel);
            box-shadow: 0 25px 90px rgba(0,0,0,.65), var(--glow);
        }

        .video-modal h2 {
            font-size: 1.8rem;
            margin: 0 0 12px;
        }

        .video-modal p {
            color: var(--muted);
            margin-bottom: 22px;
        }

        .modal-close {
            position: absolute;
            top: 13px;
            right: 16px;
            border: 0;
            color: var(--muted);
            background: transparent;
            font-size: 1.7rem;
        }

        .modal-close:hover {
            color: var(--cyan);
        }

        @media (max-width: 1024px) {
            .nav-wrap {
                gap: 12px;
            }

            .brand {
                min-width: 205px;
                font-size: .88rem;
            }

            .main-nav a {
                padding-inline: 8px;
                font-size: .8rem;
            }

            .hero-grid {
                gap: 38px;
            }

            .article-layout {
                grid-template-columns: minmax(0, 1fr) 275px;
                gap: 30px;
            }

            .footer-grid {
                grid-template-columns: 1.2fr 1fr 1fr;
            }

            .footer-grid > div:last-child {
                grid-column: 2 / 4;
            }
        }

        @media (max-width: 768px) {
            .container {
                width: min(100% - 30px, 620px);
            }

            .nav-wrap {
                min-height: 70px;
                flex-wrap: nowrap;
            }

            .brand {
                min-width: 0;
                flex: 1;
            }

            .brand-mark {
                width: 34px;
                height: 34px;
            }

            .menu-toggle {
                display: inline-block;
                order: 3;
            }

            .main-nav {
                display: none;
                position: absolute;
                top: 70px;
                left: 15px;
                right: 15px;
                padding: 12px;
                flex-direction: column;
                align-items: stretch;
                background: rgba(13,17,30,.98);
                border: 1px solid var(--line-bright);
                border-radius: var(--radius-sm);
                box-shadow: var(--shadow);
            }

            .site-header.open .main-nav {
                display: flex;
            }

            .main-nav a {
                padding: 12px 13px;
            }

            .nav-actions {
                gap: 2px;
            }

            .nav-login {
                font-size: .75rem;
                padding-inline: 5px;
            }

            .nav-actions .button {
                padding: 10px 11px;
                font-size: .75rem;
            }

            .article-hero {
                min-height: auto;
                padding: 130px 0 60px;
            }

            .hero-grid,
            .article-layout,
            .strip-inner,
            .faq-grid {
                grid-template-columns: 1fr;
            }

            .hero-grid {
                gap: 40px;
            }

            .article-hero h1 {
                font-size: clamp(2.25rem, 9vw, 3.7rem);
            }

            .video-stage {
                min-height: 280px;
            }

            .article-shell {
                padding-top: 58px;
            }

            .article-aside {
                position: static;
            }

            .faq-grid {
                gap: 35px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px 22px;
            }

            .footer-grid > div:last-child {
                grid-column: auto;
            }

            .copyright {
                flex-direction: column;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            body {
                font-size: 15px;
            }

            .container {
                width: min(100% - 24px, 480px);
            }

            .brand {
                font-size: .75rem;
                gap: 7px;
            }

            .brand-mark {
                width: 30px;
                height: 30px;
                font-size: .78rem;
            }

            .nav-login {
                display: none;
            }

            .nav-actions .button {
                padding: 9px 9px;
                font-size: .7rem;
            }

            .article-hero {
                padding-top: 117px;
            }

            .article-hero h1 {
                font-size: 2.2rem;
            }

            .hero-summary {
                font-size: .98rem;
            }

            .hero-actions,
            .cta-actions {
                flex-direction: column;
                align-items: stretch;
            }

            .hero-actions .button,
            .cta-actions .button {
                width: 100%;
            }

            .video-stage {
                min-height: 235px;
            }

            .video-caption {
                left: 18px;
                right: 18px;
                bottom: 17px;
            }

            .video-caption strong {
                font-size: .9rem;
            }

            .video-play {
                width: 62px;
                height: 62px;
            }

            .topic-banner,
            .payment-banner {
                padding: 24px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }

            .fab-support {
                left: 12px;
                bottom: 75px;
            }
        }

/* roulang page: category2 */
:root {
            --bg: #08090f;
            --bg-soft: #0d111e;
            --panel: #111827;
            --panel-light: #162033;
            --blue: #0052ff;
            --cyan: #00f0ff;
            --cyan-soft: #9ff8ff;
            --text: #f7fbff;
            --muted: #a8b5c8;
            --line: rgba(112,154,218,.22);
            --line-bright: rgba(0,240,255,.58);
            --danger: #ff5572;
            --success: #55e6a5;
            --radius: 18px;
            --radius-sm: 12px;
            --shadow: 0 20px 70px rgba(0,0,0,.35);
            --glow: 0 0 28px rgba(0,240,255,.18);
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            color: var(--text);
            background:
                linear-gradient(rgba(8,9,15,.91), rgba(8,9,15,.98)),
                url('/assets/images/backpic/back-2.jpg') center top / cover fixed;
            font-family: "Be Vietnam Pro", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.65;
            overflow-x: hidden;
        }
        body::before {
            content: "";
            position: fixed;
            inset: 0;
            z-index: -1;
            pointer-events: none;
            opacity: .15;
            background-image:
                linear-gradient(rgba(0,240,255,.12) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0,240,255,.12) 1px, transparent 1px);
            background-size: 42px 42px;
            mask-image: linear-gradient(to bottom, black, transparent 80%);
        }
        a { color: inherit; text-decoration: none; transition: .25s ease; }
        img { display: block; max-width: 100%; }
        button, input { font: inherit; }
        button { cursor: pointer; }
        h1, h2, h3, p { margin-top: 0; }
        h2, h3 { letter-spacing: -.035em; }
        .container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
        .section { position: relative; padding: 92px 0; }
        .section-head { max-width: 720px; margin-bottom: 38px; }
        .section-head p { max-width: 680px; margin-bottom: 0; color: var(--muted); }
        .eyebrow, .label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--cyan-soft);
            font-size: .75rem;
            font-weight: 700;
            letter-spacing: .12em;
            text-transform: uppercase;
        }
        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--cyan);
            box-shadow: 0 0 12px var(--cyan);
        }
        .muted { color: var(--muted); }
        .site-header {
            position: fixed;
            z-index: 100;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(8,9,15,.84);
            border-bottom: 1px solid rgba(0,240,255,.16);
            backdrop-filter: blur(18px);
        }
        .nav-wrap {
            min-height: 76px;
            display: flex;
            align-items: center;
            gap: 24px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 11px;
            min-width: 235px;
            font-family: "Space Grotesk", sans-serif;
            font-weight: 700;
            font-size: .98rem;
            line-height: 1.12;
        }
        .brand-mark {
            width: 38px;
            height: 38px;
            display: grid;
            place-items: center;
            color: var(--bg);
            background: linear-gradient(145deg, var(--cyan), #6b73ff);
            clip-path: polygon(18% 0,100% 0,82% 100%,0 100%);
            font-weight: 800;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 5px;
            flex: 1;
        }
        .main-nav a {
            color: #b9c6d9;
            font-size: .88rem;
            padding: 9px 13px;
            border-radius: 9px;
            white-space: nowrap;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text);
            background: rgba(0,240,255,.09);
            box-shadow: inset 0 -2px var(--cyan);
        }
        .nav-actions { display: flex; align-items: center; gap: 8px; }
        .button {
            border: 0;
            border-radius: 8px;
            padding: 12px 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            font-weight: 700;
            font-size: .9rem;
            line-height: 1.2;
            transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
        }
        .button:hover { transform: translateY(-3px); }
        .button:active { transform: translateY(1px); }
        .button:focus-visible,
        a:focus-visible,
        summary:focus-visible {
            outline: 3px solid rgba(0,240,255,.55);
            outline-offset: 3px;
        }
        .button-primary {
            color: #fff;
            background: linear-gradient(120deg, var(--blue), #387bff);
            box-shadow: 0 10px 26px rgba(0,82,255,.3);
        }
        .button-primary:hover { box-shadow: 0 12px 32px rgba(0,240,255,.3); }
        .button-outline {
            color: var(--cyan-soft);
            border: 1px solid var(--line-bright);
            background: rgba(0,240,255,.04);
        }
        .button-outline:hover { background: rgba(0,240,255,.12); }
        .button-quiet {
            color: #d6e3f4;
            background: transparent;
            padding-inline: 10px;
        }
        .button-quiet:hover { color: var(--cyan); }
        .menu-toggle {
            display: none;
            color: var(--cyan);
            background: transparent;
            border: 1px solid var(--line-bright);
            border-radius: 8px;
            padding: 7px 10px;
        }

        .page-banner {
            min-height: 590px;
            padding: 150px 0 76px;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            background:
                linear-gradient(90deg, rgba(8,9,15,.96) 5%, rgba(8,9,15,.78) 58%, rgba(8,9,15,.92)),
                url('/assets/images/backpic/back-3.jpg') center / cover;
            border-bottom: 1px solid var(--line);
        }
        .page-banner::after {
            content: "";
            position: absolute;
            width: 360px;
            height: 360px;
            right: 5%;
            bottom: -180px;
            border: 1px solid rgba(0,240,255,.25);
            transform: rotate(45deg);
            box-shadow: 0 0 80px rgba(0,82,255,.2);
        }
        .banner-grid {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: minmax(0, 1fr) minmax(320px, .72fr);
            gap: 64px;
            align-items: center;
        }
        .page-banner h1 {
            max-width: 780px;
            margin: 17px 0 20px;
            font-size: clamp(2.3rem, 5vw, 4.65rem);
            line-height: 1.05;
            letter-spacing: -.065em;
        }
        .page-banner h1 span { color: var(--cyan); }
        .banner-copy {
            max-width: 675px;
            color: #c5d1e2;
            font-size: 1.08rem;
        }
        .banner-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
        .signal-panel {
            position: relative;
            min-height: 315px;
            padding: 27px;
            background: rgba(13,17,30,.78);
            border: 1px solid var(--line-bright);
            clip-path: polygon(0 16px,16px 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%);
            box-shadow: var(--glow), var(--shadow);
        }
        .signal-panel::before {
            content: "SECURE LINK";
            position: absolute;
            top: 18px;
            right: 24px;
            color: var(--success);
            font: 700 .68rem "Space Grotesk", sans-serif;
            letter-spacing: .12em;
        }
        .signal-panel h2 {
            max-width: 250px;
            margin: 37px 0 24px;
            font-size: 1.55rem;
        }
        .signal-line {
            height: 104px;
            margin: 10px 0 20px;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid rgba(0,240,255,.28);
            background: linear-gradient(180deg, rgba(0,240,255,.06), transparent);
        }
        .signal-line::after {
            content: "";
            position: absolute;
            inset: 38px 0 auto;
            height: 2px;
            background: var(--cyan);
            transform: skewY(-13deg) rotate(-2deg);
            box-shadow: 26px 17px 0 var(--cyan), 61px 2px 0 var(--cyan), 97px 28px 0 var(--cyan), 138px 4px 0 var(--cyan), 182px 31px 0 var(--cyan), 224px 8px 0 var(--cyan), 270px 25px 0 var(--cyan);
            filter: drop-shadow(0 0 7px var(--cyan));
        }
        .signal-data { display: flex; justify-content: space-between; gap: 15px; }
        .signal-data strong { display: block; color: var(--success); font: 700 1.35rem "Space Grotesk", sans-serif; }
        .signal-data span { color: var(--muted); font-size: .78rem; }

        .split-section {
            display: grid;
            grid-template-columns: .88fr 1.12fr;
            gap: 68px;
            align-items: start;
        }
        .split-section h2,
        .section-head h2 {
            margin: 14px 0 14px;
            font-size: clamp(1.9rem, 3.4vw, 3rem);
            line-height: 1.12;
        }
        .feature-image {
            position: relative;
            min-height: 415px;
            overflow: hidden;
            border: 1px solid var(--line);
            box-shadow: var(--shadow);
            clip-path: polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,22px 100%,0 calc(100% - 22px));
        }
        .feature-image img { width: 100%; height: 100%; min-height: 415px; object-fit: cover; opacity: .82; }
        .feature-image::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0,240,255,.2), transparent 45%, rgba(0,82,255,.35));
        }
        .feature-tag {
            position: absolute;
            z-index: 2;
            left: 22px;
            bottom: 22px;
            padding: 9px 13px;
            color: var(--text);
            background: rgba(8,9,15,.78);
            border-left: 3px solid var(--cyan);
            font-size: .8rem;
            font-weight: 700;
        }
        .benefit-list { margin: 30px 0 0; list-style: none; }
        .benefit-list li {
            display: grid;
            grid-template-columns: 44px 1fr;
            gap: 16px;
            padding: 20px 0;
            border-top: 1px solid var(--line);
        }
        .benefit-icon {
            width: 42px;
            height: 42px;
            display: grid;
            place-items: center;
            color: var(--cyan);
            border: 1px solid var(--line-bright);
            background: rgba(0,240,255,.07);
            font: 700 1.1rem "Space Grotesk", sans-serif;
        }
        .benefit-list h3 { margin: 0 0 4px; font-size: 1.08rem; }
        .benefit-list p { margin: 0; color: var(--muted); font-size: .92rem; }

        .dark-band {
            background: linear-gradient(110deg, rgba(13,17,30,.96), rgba(17,24,39,.82));
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }
        .process-layout {
            display: grid;
            grid-template-columns: .72fr 1.28fr;
            gap: 62px;
            align-items: center;
        }
        .process-intro p { color: var(--muted); }
        .process-steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .step {
            min-height: 210px;
            padding: 23px 20px;
            background: rgba(8,9,15,.54);
            border: 1px solid var(--line);
            transition: .25s ease;
        }
        .step:hover {
            transform: translateY(-5px);
            border-color: var(--cyan);
            box-shadow: var(--glow);
        }
        .step-number {
            display: block;
            margin-bottom: 35px;
            color: var(--cyan);
            font: 700 1.5rem "Space Grotesk", sans-serif;
        }
        .step h3 { margin-bottom: 8px; font-size: 1rem; }
        .step p { margin: 0; color: var(--muted); font-size: .86rem; }

        .scenario-grid {
            display: grid;
            grid-template-columns: 1.15fr .85fr;
            gap: 22px;
        }
        .scenario {
            min-height: 205px;
            padding: 27px;
            position: relative;
            overflow: hidden;
            background: var(--panel);
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
        }
        .scenario.large { grid-row: span 2; min-height: 432px; }
        .scenario:hover { border-color: var(--line-bright); box-shadow: var(--glow); }
        .scenario img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: .2;
            transition: transform .45s ease, opacity .35s ease;
        }
        .scenario:hover img { transform: scale(1.06); opacity: .3; }
        .scenario-content { position: relative; z-index: 1; max-width: 390px; }
        .scenario .label { margin-bottom: 48px; }
        .scenario h3 { font-size: 1.3rem; margin-bottom: 8px; }
        .scenario p { color: #c0ccdc; margin-bottom: 0; font-size: .92rem; }

        .evidence-section { padding-bottom: 70px; }
        .evidence-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }
        .evidence-item { padding: 25px 24px; border-right: 1px solid var(--line); }
        .evidence-item:last-child { border-right: 0; }
        .evidence-item strong {
            display: block;
            color: var(--cyan);
            font: 700 clamp(1.55rem, 3vw, 2.3rem) "Space Grotesk", sans-serif;
            line-height: 1.1;
        }
        .evidence-item span { display: block; margin-top: 7px; color: var(--muted); font-size: .86rem; }

        .faq-layout {
            display: grid;
            grid-template-columns: .78fr 1.22fr;
            gap: 70px;
            align-items: start;
        }
        .faq-layout .section-head { margin-bottom: 0; }
        .faq-list { border-top: 1px solid var(--line); }
        .faq-item { border-bottom: 1px solid var(--line); }
        .faq-item summary {
            list-style: none;
            cursor: pointer;
            padding: 20px 38px 20px 0;
            position: relative;
            color: var(--text);
            font-weight: 700;
        }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after {
            content: "+";
            position: absolute;
            top: 18px;
            right: 4px;
            color: var(--cyan);
            font-size: 1.5rem;
            font-weight: 400;
        }
        .faq-item[open] summary::after { content: "−"; }
        .faq-answer { padding: 0 35px 20px 0; color: var(--muted); font-size: .93rem; }

        .cta-section { padding: 72px 0 96px; }
        .cta-box {
            position: relative;
            overflow: hidden;
            padding: 48px 55px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 35px;
            background:
                linear-gradient(110deg, rgba(0,82,255,.72), rgba(0,240,255,.14)),
                url('/assets/images/backpic/back-1.jpg') center / cover;
            border: 1px solid rgba(0,240,255,.65);
            box-shadow: 0 0 45px rgba(0,82,255,.25);
            clip-path: polygon(0 18px,18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
        }
        .cta-box h2 { max-width: 650px; margin: 10px 0 0; font-size: clamp(1.7rem, 3.4vw, 2.8rem); line-height: 1.12; }
        .cta-box p { max-width: 610px; margin: 12px 0 0; color: #dbeeff; }
        .cta-box .button { flex-shrink: 0; color: var(--bg); background: var(--cyan); box-shadow: 0 0 24px rgba(0,240,255,.38); }
        .cta-box .button:hover { background: #fff; }

        .site-footer {
            padding: 67px 0 24px;
            background: rgba(5,7,12,.96);
            border-top: 1px solid var(--line);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.35fr .8fr .95fr .95fr;
            gap: 42px;
        }
        .footer-brand { min-width: 0; }
        .footer-copy { max-width: 360px; margin: 21px 0; color: var(--muted); font-size: .88rem; }
        .footer-title {
            margin: 7px 0 17px;
            color: var(--cyan-soft);
            font-size: .82rem;
            font-weight: 700;
            letter-spacing: .08em;
            text-transform: uppercase;
        }
        .footer-links { margin: 0; list-style: none; }
        .footer-links li { margin: 9px 0; }
        .footer-links a { color: var(--muted); font-size: .88rem; }
        .footer-links a:hover { color: var(--cyan); padding-left: 4px; }
        .trust-row { display: flex; flex-wrap: wrap; gap: 8px; }
        .trust-badge {
            padding: 6px 9px;
            color: #bce8ef;
            border: 1px solid rgba(0,240,255,.28);
            background: rgba(0,240,255,.06);
            font-size: .7rem;
            border-radius: 5px;
        }
        .copyright {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            margin-top: 48px;
            padding-top: 20px;
            color: #718096;
            border-top: 1px solid rgba(112,154,218,.14);
            font-size: .76rem;
        }
        .fab {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            min-width: 54px;
            min-height: 54px;
            display: grid;
            place-items: center;
            color: var(--cyan);
            background: rgba(0,0,0,.7);
            border: 1px solid var(--cyan);
            border-radius: 12px;
            box-shadow: 0 0 15px rgba(0,240,255,.5);
            font: 700 1.15rem "Space Grotesk", sans-serif;
            opacity: .72;
            transition: .28s ease;
        }
        .fab:hover { opacity: 1; transform: scale(1.1); box-shadow: 0 0 28px rgba(0,240,255,.8); }
        .fab::after {
            content: "MỚI";
            position: absolute;
            right: -17px;
            top: -11px;
            padding: 2px 5px;
            color: var(--bg);
            background: var(--success);
            border-radius: 4px;
            font-size: .57rem;
            animation: blink 1.7s infinite;
        }
        @keyframes blink { 50% { opacity: .35; } }

        @media (max-width: 1024px) {
            .brand { min-width: 205px; }
            .nav-wrap { gap: 12px; }
            .main-nav a { padding-inline: 8px; font-size: .8rem; }
            .banner-grid, .split-section, .process-layout, .faq-layout { gap: 38px; }
            .footer-grid { grid-template-columns: 1.2fr 1fr 1fr; }
            .footer-grid > div:first-child { grid-column: 1 / -1; }
        }
        @media (max-width: 768px) {
            .container { width: min(100% - 30px, 620px); }
            .section { padding: 68px 0; }
            .nav-wrap { min-height: 68px; flex-wrap: wrap; }
            .brand { flex: 1; min-width: 0; font-size: .86rem; }
            .menu-toggle { display: block; order: 2; }
            .nav-actions { order: 3; gap: 3px; }
            .nav-actions .button { padding: 9px 10px; font-size: .75rem; }
            .main-nav {
                display: none;
                order: 4;
                flex-basis: 100%;
                padding: 8px 0 14px;
                flex-direction: column;
                align-items: stretch;
                gap: 3px;
            }
            .main-nav.is-open { display: flex; }
            .main-nav a { padding: 10px 12px; }
            .page-banner { min-height: auto; padding: 135px 0 70px; }
            .banner-grid, .split-section, .process-layout, .faq-layout, .scenario-grid { grid-template-columns: 1fr; }
            .signal-panel { min-height: 280px; }
            .feature-image, .feature-image img { min-height: 300px; }
            .scenario.large { grid-row: auto; min-height: 280px; }
            .process-steps { grid-template-columns: 1fr; }
            .step { min-height: auto; }
            .step-number { margin-bottom: 18px; }
            .evidence-row { grid-template-columns: repeat(2, 1fr); }
            .evidence-item:nth-child(2) { border-right: 0; }
            .evidence-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
            .cta-box { padding: 35px 28px; display: block; }
            .cta-box .button { margin-top: 25px; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 28px 22px; }
            .copyright { display: block; }
            .copyright span { display: block; margin-bottom: 7px; }
        }
        @media (max-width: 520px) {
            body { font-size: 15px; }
            .container { width: min(100% - 24px, 470px); }
            .brand-mark { width: 34px; height: 34px; }
            .brand { font-size: .76rem; gap: 7px; }
            .nav-actions .button-quiet { padding-inline: 5px; }
            .nav-actions .button-primary { padding-inline: 8px; }
            .page-banner h1 { font-size: 2.3rem; }
            .page-banner h1 span { display: inline; }
            .banner-actions .button { width: 100%; }
            .signal-panel { padding: 21px; }
            .signal-line { margin-top: 18px; }
            .evidence-row { display: block; }
            .evidence-item,
            .evidence-item:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
            .evidence-item:last-child { border-bottom: 0; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-grid > div:first-child { grid-column: auto; }
            .fab { left: 12px; bottom: 76px; }
        }

/* roulang page: category3 */
:root {
            --bg: #08090f;
            --bg-soft: #0d111e;
            --panel: #111827;
            --panel-light: #162033;
            --blue: #0052ff;
            --cyan: #00f0ff;
            --cyan-soft: #9ff8ff;
            --text: #f7fbff;
            --muted: #a8b5c8;
            --line: rgba(112,154,218,.22);
            --line-bright: rgba(0,240,255,.58);
            --danger: #ff5572;
            --success: #55e6a5;
            --radius: 18px;
            --radius-sm: 12px;
            --shadow: 0 20px 70px rgba(0,0,0,.35);
            --glow: 0 0 28px rgba(0,240,255,.18);
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            color: var(--text);
            background:
                linear-gradient(rgba(8,9,15,.91), rgba(8,9,15,.98)),
                url('/assets/images/backpic/back-2.jpg') center top / cover fixed;
            font-family: "Be Vietnam Pro", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.65;
            overflow-x: hidden;
        }
        body::before {
            content: "";
            position: fixed;
            inset: 0;
            z-index: -1;
            pointer-events: none;
            opacity: .16;
            background-image:
                linear-gradient(rgba(0,240,255,.12) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0,240,255,.12) 1px, transparent 1px);
            background-size: 42px 42px;
            mask-image: linear-gradient(to bottom, black, transparent 80%);
        }
        a { color: inherit; text-decoration: none; transition: .25s ease; }
        a:hover { color: var(--cyan); }
        img { display: block; max-width: 100%; }
        button, input { font: inherit; }
        button { cursor: pointer; }
        ul { margin: 0; padding: 0; list-style: none; }
        h1, h2, h3, h4, p { margin-top: 0; }
        h1, h2, h3, h4 { font-family: "Space Grotesk", sans-serif; line-height: 1.15; }
        h2 { font-size: clamp(2rem, 4vw, 3.25rem); letter-spacing: -.045em; margin-bottom: 16px; }
        h3 { font-size: 1.25rem; margin-bottom: 10px; }
        p { color: var(--muted); }
        .container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
        .section { padding: 92px 0; position: relative; }
        .section-head { max-width: 720px; margin-bottom: 38px; }
        .section-head p { max-width: 680px; margin-bottom: 0; }
        .eyebrow, .label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--cyan-soft);
            font-size: .75rem;
            font-weight: 700;
            letter-spacing: .12em;
            text-transform: uppercase;
        }
        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--cyan);
            box-shadow: 0 0 12px var(--cyan);
        }
        .muted { color: var(--muted); }

        .site-header {
            position: fixed;
            z-index: 100;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(8,9,15,.84);
            border-bottom: 1px solid rgba(0,240,255,.16);
            backdrop-filter: blur(18px);
        }
        .nav-wrap {
            min-height: 76px;
            display: flex;
            align-items: center;
            gap: 24px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 11px;
            min-width: 235px;
            font-family: "Space Grotesk", sans-serif;
            font-weight: 700;
            font-size: .98rem;
            line-height: 1.12;
        }
        .brand-mark {
            width: 38px;
            height: 38px;
            flex: 0 0 38px;
            display: grid;
            place-items: center;
            color: var(--bg);
            background: linear-gradient(145deg, var(--cyan), #6b73ff);
            clip-path: polygon(18% 0,100% 0,82% 100%,0 100%);
            font-weight: 800;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
        }
        .main-nav a {
            color: #b9c6d9;
            font-size: .86rem;
            padding: 9px 12px;
            border-radius: 9px;
            white-space: nowrap;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text);
            background: rgba(0,240,255,.09);
            box-shadow: inset 0 -2px var(--cyan);
        }
        .nav-actions { display: flex; align-items: center; gap: 8px; }
        .nav-login {
            color: var(--cyan-soft);
            padding: 10px 8px;
            font-size: .88rem;
            font-weight: 700;
        }
        .button {
            border: 0;
            border-radius: 8px;
            padding: 12px 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            font-weight: 700;
            font-size: .9rem;
            line-height: 1.2;
            transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
        }
        .button:hover { transform: translateY(-3px); color: #fff; }
        .button:active { transform: translateY(1px); }
        .button-primary {
            color: #fff;
            background: linear-gradient(120deg, var(--blue), #387bff);
            box-shadow: 0 10px 26px rgba(0,82,255,.3);
        }
        .button-primary:hover { box-shadow: 0 12px 32px rgba(0,240,255,.3); }
        .button-outline {
            color: var(--cyan-soft);
            border: 1px solid var(--line-bright);
            background: rgba(0,240,255,.04);
        }
        .button-outline:hover { background: rgba(0,240,255,.12); }
        .menu-toggle {
            display: none;
            color: var(--cyan);
            background: transparent;
            border: 1px solid var(--line-bright);
            border-radius: 8px;
            padding: 7px 10px;
        }

        .page-banner {
            min-height: 570px;
            padding: 150px 0 78px;
            display: flex;
            align-items: center;
            background:
                linear-gradient(90deg, rgba(8,9,15,.96) 0%, rgba(8,9,15,.78) 52%, rgba(8,9,15,.88) 100%),
                url('/assets/images/backpic/back-3.jpg') center / cover;
            border-bottom: 1px solid var(--line);
        }
        .banner-layout {
            display: grid;
            grid-template-columns: minmax(0,1fr) 380px;
            gap: 68px;
            align-items: end;
        }
        .page-banner h1 {
            max-width: 820px;
            margin: 17px 0 23px;
            font-size: clamp(2.45rem, 5vw, 5rem);
            letter-spacing: -.065em;
        }
        .page-banner h1 span { color: var(--cyan); }
        .banner-copy {
            max-width: 670px;
            color: #c1ccdc;
            font-size: 1.06rem;
            line-height: 1.75;
        }
        .banner-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
        .banner-panel {
            padding: 25px;
            background: rgba(17,24,39,.78);
            border: 1px solid var(--line-bright);
            border-radius: var(--radius);
            box-shadow: var(--glow);
            position: relative;
            overflow: hidden;
        }
        .banner-panel::after {
            content: "";
            position: absolute;
            width: 150px;
            height: 150px;
            right: -60px;
            top: -65px;
            border: 1px solid rgba(0,240,255,.35);
            transform: rotate(45deg);
        }
        .panel-kicker { color: var(--success); font-size: .78rem; font-weight: 700; }
        .panel-number {
            margin: 8px 0 2px;
            color: var(--text);
            font-family: "Space Grotesk", sans-serif;
            font-size: 2.6rem;
            font-weight: 700;
            letter-spacing: -.06em;
        }
        .panel-number span { color: var(--cyan); }
        .panel-note { margin-bottom: 20px; font-size: .88rem; }
        .signal-line {
            height: 6px;
            margin-bottom: 10px;
            background: linear-gradient(90deg, var(--cyan), var(--blue), transparent);
            border-radius: 20px;
            box-shadow: 0 0 15px rgba(0,240,255,.5);
        }
        .signal-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: .78rem; }

        .subnav {
            border-bottom: 1px solid var(--line);
            background: rgba(13,17,30,.82);
        }
        .subnav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            min-height: 64px;
        }
        .subnav-title { color: var(--text); font-weight: 700; }
        .subnav-links { display: flex; gap: 23px; color: var(--muted); font-size: .88rem; }
        .subnav-links a:hover { color: var(--cyan); }

        .intro-grid {
            display: grid;
            grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
            gap: 72px;
            align-items: start;
        }
        .intro-grid h2 { max-width: 460px; }
        .intro-lead { color: #d6e0ec; font-size: 1.04rem; }
        .intro-content p { max-width: 720px; }
        .info-list { margin-top: 25px; border-top: 1px solid var(--line); }
        .info-list li {
            display: grid;
            grid-template-columns: 42px 1fr;
            gap: 15px;
            padding: 18px 0;
            border-bottom: 1px solid var(--line);
        }
        .list-icon {
            width: 32px;
            height: 32px;
            display: grid;
            place-items: center;
            color: var(--cyan);
            border: 1px solid var(--line-bright);
            border-radius: 8px;
            font-size: .84rem;
            font-weight: 800;
        }
        .info-list strong { display: block; margin-bottom: 3px; color: var(--text); }
        .info-list span { display: block; color: var(--muted); font-size: .91rem; }

        .benefit-section { background: rgba(13,17,30,.66); }
        .benefit-layout {
            display: grid;
            grid-template-columns: 1.05fr .95fr;
            gap: 65px;
            align-items: center;
        }
        .benefit-visual {
            min-height: 410px;
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--line);
            box-shadow: var(--shadow);
        }
        .benefit-visual img { width: 100%; height: 100%; min-height: 410px; object-fit: cover; opacity: .68; }
        .benefit-visual::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0,240,255,.15), rgba(8,9,15,.86));
        }
        .visual-caption {
            position: absolute;
            z-index: 1;
            left: 28px;
            right: 28px;
            bottom: 25px;
        }
        .visual-caption strong { display: block; margin-bottom: 5px; font-family: "Space Grotesk"; font-size: 1.5rem; }
        .visual-caption p { margin: 0; font-size: .9rem; }
        .benefit-copy h2 { max-width: 580px; }
        .benefit-copy > p { max-width: 570px; }
        .benefit-points {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 22px 28px;
            margin-top: 30px;
        }
        .benefit-point { position: relative; padding-left: 22px; }
        .benefit-point::before {
            content: "";
            position: absolute;
            left: 0;
            top: 9px;
            width: 7px;
            height: 7px;
            background: var(--cyan);
            box-shadow: 0 0 12px var(--cyan);
            border-radius: 50%;
        }
        .benefit-point strong { display: block; margin-bottom: 4px; font-size: .98rem; }
        .benefit-point p { margin: 0; font-size: .87rem; }

        .steps-section { padding-top: 82px; }
        .steps-layout {
            display: grid;
            grid-template-columns: .72fr 1.28fr;
            gap: 70px;
        }
        .steps-intro { position: sticky; top: 110px; align-self: start; }
        .steps-intro p { max-width: 390px; }
        .step-list { counter-reset: steps; }
        .step-item {
            counter-increment: steps;
            display: grid;
            grid-template-columns: 70px 1fr;
            gap: 22px;
            padding: 0 0 32px;
            margin-bottom: 32px;
            border-bottom: 1px solid var(--line);
        }
        .step-item:last-child { margin-bottom: 0; }
        .step-item::before {
            content: counter(steps, decimal-leading-zero);
            width: 57px;
            height: 57px;
            display: grid;
            place-items: center;
            color: var(--cyan);
            border: 1px solid var(--line-bright);
            border-radius: 50%;
            font-family: "Space Grotesk";
            font-weight: 700;
            box-shadow: inset 0 0 18px rgba(0,240,255,.07);
        }
        .step-item h3 { margin: 2px 0 7px; }
        .step-item p { margin: 0; max-width: 630px; font-size: .94rem; }

        .offer-section { background: linear-gradient(90deg, rgba(0,82,255,.1), rgba(0,240,255,.035)); }
        .offer-heading {
            display: flex;
            justify-content: space-between;
            align-items: end;
            gap: 30px;
            margin-bottom: 34px;
        }
        .offer-heading p { max-width: 500px; margin: 0; }
        .offer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }
        .offer-card {
            min-height: 270px;
            padding: 26px;
            position: relative;
            background: rgba(17,24,39,.8);
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
            transition: .3s ease;
        }
        .offer-card:hover {
            transform: translateY(-7px);
            border-color: var(--line-bright);
            box-shadow: var(--glow);
        }
        .offer-card.featured { border-color: rgba(0,240,255,.62); }
        .offer-card.featured::before {
            content: "Được quan tâm";
            position: absolute;
            right: 17px;
            top: 17px;
            padding: 4px 8px;
            color: var(--bg);
            background: var(--cyan);
            border-radius: 5px;
            font-size: .68rem;
            font-weight: 800;
        }
        .offer-tag { color: var(--success); font-size: .76rem; font-weight: 700; letter-spacing: .08em; }
        .offer-card h3 { margin-top: 20px; font-size: 1.35rem; }
        .offer-card p { font-size: .9rem; }
        .offer-meta {
            display: flex;
            justify-content: space-between;
            gap: 10px;
            margin-top: 23px;
            padding-top: 15px;
            border-top: 1px solid var(--line);
            color: var(--cyan-soft);
            font-size: .79rem;
            font-weight: 600;
        }

        .trust-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) minmax(330px, .8fr);
            gap: 70px;
            align-items: center;
        }
        .trust-layout h2 { max-width: 580px; }
        .trust-layout > div > p { max-width: 630px; }
        .trust-metrics {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1px;
            background: var(--line);
            border: 1px solid var(--line);
        }
        .metric {
            min-height: 125px;
            padding: 23px;
            background: rgba(17,24,39,.9);
        }
        .metric strong {
            display: block;
            margin-bottom: 3px;
            color: var(--cyan);
            font-family: "Space Grotesk";
            font-size: 1.9rem;
        }
        .metric span { color: var(--muted); font-size: .84rem; }

        .faq-section { background: rgba(13,17,30,.68); }
        .faq-layout {
            display: grid;
            grid-template-columns: .75fr 1.25fr;
            gap: 80px;
        }
        .faq-intro p { max-width: 360px; }
        .faq-item {
            border-top: 1px solid var(--line);
        }
        .faq-item:last-child { border-bottom: 1px solid var(--line); }
        .faq-question {
            width: 100%;
            display: flex;
            justify-content: space-between;
            gap: 25px;
            padding: 21px 0;
            color: var(--text);
            text-align: left;
            background: transparent;
            border: 0;
            font-weight: 700;
        }
        .faq-question span:last-child {
            color: var(--cyan);
            font-size: 1.25rem;
            line-height: 1;
            transition: transform .25s ease;
        }
        .faq-answer {
            display: none;
            padding: 0 45px 21px 0;
        }
        .faq-answer p { margin: 0; font-size: .93rem; }
        .faq-item.open .faq-answer { display: block; }
        .faq-item.open .faq-question span:last-child { transform: rotate(45deg); }

        .cta {
            padding: 76px 0;
            text-align: center;
            background:
                linear-gradient(100deg, rgba(0,82,255,.88), rgba(0,157,190,.8)),
                url('/assets/images/backpic/back-1.jpg') center / cover;
            border-top: 1px solid rgba(0,240,255,.45);
            border-bottom: 1px solid rgba(0,240,255,.45);
        }
        .cta h2 { max-width: 780px; margin: 0 auto 15px; }
        .cta p { max-width: 650px; margin: 0 auto 28px; color: #e1faff; }
        .cta .button-primary { color: var(--bg); background: var(--cyan); box-shadow: 0 12px 30px rgba(0,0,0,.22); }
        .cta .button-primary:hover { color: var(--bg); background: #fff; }

        .site-footer {
            padding: 70px 0 22px;
            background: #07080d;
            border-top: 1px solid var(--line);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 35px;
            padding-bottom: 48px;
        }
        .footer-brand { min-width: auto; margin-bottom: 20px; }
        .footer-copy { max-width: 350px; font-size: .88rem; }
        .trust-row { display: flex; flex-wrap: wrap; gap: 8px; }
        .trust-badge {
            padding: 6px 9px;
            color: var(--cyan-soft);
            border: 1px solid var(--line);
            border-radius: 5px;
            font-size: .68rem;
        }
        .footer-title {
            margin: 4px 0 17px;
            color: var(--text);
            font-family: "Space Grotesk";
            font-weight: 700;
        }
        .footer-links { display: grid; gap: 10px; }
        .footer-links a { color: var(--muted); font-size: .86rem; }
        .footer-links a:hover { color: var(--cyan); padding-left: 4px; }
        .copyright {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            padding-top: 19px;
            color: #718098;
            border-top: 1px solid var(--line);
            font-size: .76rem;
        }

        .fab {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            width: 58px;
            height: 58px;
            display: grid;
            place-items: center;
            color: var(--cyan);
            background: rgba(0,0,0,.72);
            border: 1px solid var(--cyan);
            border-radius: 50%;
            box-shadow: 0 0 15px rgba(0,240,255,.5);
            font-family: "Space Grotesk";
            font-size: .78rem;
            font-weight: 800;
            opacity: .72;
            animation: fabFloat 3s ease-in-out infinite;
        }
        .fab::after {
            content: "MỚI";
            position: absolute;
            top: -8px;
            right: -14px;
            padding: 2px 5px;
            color: var(--bg);
            background: var(--cyan);
            border-radius: 4px;
            font-size: .52rem;
            animation: blink 1.8s infinite;
        }
        .fab:hover { color: #fff; opacity: 1; transform: scale(1.1); box-shadow: 0 0 28px rgba(0,240,255,.8); }
        .fab:active { transform: scale(.95); }
        @keyframes fabFloat { 0%,100% { translate: 0 0; } 50% { translate: 0 -7px; } }
        @keyframes blink { 0%,45%,100% { opacity: 1; } 55%,85% { opacity: .35; } }

        :focus-visible { outline: 3px solid rgba(0,240,255,.75); outline-offset: 3px; }

        @media (max-width: 1024px) {
            .nav-wrap { gap: 14px; }
            .brand { min-width: 205px; font-size: .88rem; }
            .main-nav a { padding-inline: 8px; font-size: .78rem; }
            .banner-layout, .benefit-layout, .trust-layout { gap: 40px; }
            .intro-grid, .steps-layout, .faq-layout { gap: 42px; }
        }

        @media (max-width: 768px) {
            .container { width: min(100% - 30px, 620px); }
            .site-header { position: fixed; }
            .nav-wrap { min-height: 68px; }
            .brand { min-width: 0; flex: 1; }
            .brand-mark { width: 34px; height: 34px; flex-basis: 34px; }
            .menu-toggle { display: block; }
            .main-nav {
                display: none;
                position: absolute;
                top: 68px;
                left: 15px;
                right: 15px;
                padding: 10px;
                flex-direction: column;
                align-items: stretch;
                background: rgba(13,17,30,.98);
                border: 1px solid var(--line-bright);
                border-radius: 12px;
                box-shadow: var(--shadow);
            }
            .main-nav.is-open { display: flex; }
            .main-nav a { padding: 12px 14px; }
            .nav-actions { gap: 4px; }
            .nav-login { padding: 8px 4px; font-size: .76rem; }
            .nav-actions .button { padding: 10px 11px; font-size: .76rem; }
            .page-banner { min-height: auto; padding: 130px 0 62px; }
            .banner-layout, .intro-grid, .benefit-layout, .steps-layout, .trust-layout, .faq-layout { grid-template-columns: 1fr; }
            .banner-panel { max-width: 480px; }
            .section { padding: 66px 0; }
            .steps-intro { position: static; }
            .offer-heading { display: block; }
            .offer-heading p { margin-top: 12px; }
            .offer-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .copyright { display: block; }
            .copyright span { display: block; margin-bottom: 7px; }
        }

        @media (max-width: 520px) {
            body { font-size: 15px; }
            .container { width: min(100% - 26px, 440px); }
            .brand { font-size: .76rem; }
            .brand-mark { width: 31px; height: 31px; flex-basis: 31px; font-size: .75rem; }
            .nav-actions .nav-login { display: none; }
            .page-banner h1 { font-size: 2.35rem; }
            .banner-copy { font-size: .96rem; }
            .banner-actions, .banner-actions .button { width: 100%; }
            .banner-actions .button { justify-content: center; }
            .subnav-inner { display: block; padding: 15px 0; }
            .subnav-links { overflow-x: auto; padding-top: 9px; gap: 18px; white-space: nowrap; }
            .benefit-points, .offer-grid, .trust-metrics, .footer-grid { grid-template-columns: 1fr; }
            .benefit-visual, .benefit-visual img { min-height: 300px; }
            .step-item { grid-template-columns: 52px 1fr; gap: 15px; }
            .step-item::before { width: 47px; height: 47px; }
            .cta { padding: 60px 0; }
            .cta h2 { font-size: 2rem; }
            .fab { left: 12px; bottom: 75px; }
        }