/* roulang page: index */
:root {
            --ink: #172436;
            --muted: #647386;
            --soft: #8b98a8;
            --blue: #2469a9;
            --blue-deep: #174a7b;
            --blue-pale: #edf5fb;
            --coral: #ef684f;
            --coral-deep: #d84d39;
            --coral-pale: #fff1ed;
            --green: #23906c;
            --yellow: #edaa3d;
            --line: #dfe7ee;
            --warm: #fcfbf8;
            --white: #ffffff;
            --dark: #172536;
            --radius: 12px;
            --shadow: 0 10px 28px rgba(35, 63, 91, .08);
            --shadow-hover: 0 16px 34px rgba(35, 63, 91, .15);
            --container: 1240px;
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            color: var(--ink);
            background: var(--warm);
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        body.menu-open { overflow: hidden; }
        a { color: inherit; text-decoration: none; }
        img { display: block; max-width: 100%; }
        button, input, textarea, select { font: inherit; }
        button { cursor: pointer; }
        :focus-visible {
            outline: 3px solid rgba(239, 104, 79, .36);
            outline-offset: 3px;
        }
        .container {
            width: min(var(--container), calc(100% - 40px));
            margin: 0 auto;
        }
        .skip-link {
            position: fixed;
            left: 16px;
            top: -60px;
            z-index: 100;
            padding: 10px 16px;
            color: #fff;
            background: var(--blue-deep);
            border-radius: 6px;
        }
        .skip-link:focus { top: 16px; }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255,255,255,.96);
            border-bottom: 1px solid var(--line);
            box-shadow: 0 3px 16px rgba(28, 53, 76, .04);
        }
        .nav-wrap {
            min-height: 76px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 11px;
            flex: 0 0 auto;
        }
        .brand-mark {
            position: relative;
            width: 38px;
            height: 38px;
            display: grid;
            place-items: center;
            color: #fff;
            background: var(--coral);
            border-radius: 9px;
            box-shadow: 4px 4px 0 #f8c4b8;
            font-size: 19px;
            font-weight: 800;
        }
        .brand-mark::after {
            content: "";
            position: absolute;
            width: 7px;
            height: 7px;
            right: 6px;
            top: 6px;
            border-radius: 50%;
            background: #ffd6cb;
        }
        .brand-name {
            font-size: 20px;
            line-height: 1;
            font-weight: 800;
            letter-spacing: 0;
        }
        .brand-name small {
            display: block;
            margin-top: 5px;
            color: var(--soft);
            font-size: 10px;
            line-height: 1;
            font-weight: 600;
            letter-spacing: 1px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 5px;
            margin-left: auto;
        }
        .main-nav a {
            position: relative;
            padding: 26px 12px 23px;
            color: var(--muted);
            font-size: 14px;
            font-weight: 650;
            white-space: nowrap;
            transition: color .2s ease;
        }
        .main-nav a::after {
            content: "";
            position: absolute;
            left: 12px;
            right: 12px;
            bottom: 15px;
            height: 2px;
            background: var(--coral);
            transform: scaleX(0);
            transition: transform .2s ease;
        }
        .main-nav a:hover, .main-nav a.active { color: var(--blue-deep); }
        .main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }
        .nav-cta, .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            min-height: 44px;
            padding: 10px 19px;
            border: 1px solid transparent;
            border-radius: 8px;
            font-weight: 750;
            transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
        }
        .nav-cta {
            color: #fff;
            background: var(--coral);
            box-shadow: 0 6px 14px rgba(239,104,79,.2);
            font-size: 14px;
        }
        .nav-cta:hover, .btn-primary:hover {
            background: var(--coral-deep);
            box-shadow: 0 9px 18px rgba(216,77,57,.22);
            transform: translateY(-2px);
        }
        .menu-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border: 1px solid var(--line);
            border-radius: 8px;
            color: var(--blue-deep);
            background: #fff;
            font-size: 20px;
        }

        .hero {
            position: relative;
            min-height: 570px;
            display: flex;
            align-items: center;
            overflow: hidden;
            color: #fff;
            background: var(--blue-deep);
        }
        .hero-media {
            position: absolute;
            inset: 0;
            background-image: linear-gradient(90deg, rgba(18,39,62,.92) 0%, rgba(18,39,62,.72) 43%, rgba(18,39,62,.25) 100%), url("https://images.unsplash.com/photo-1489599849927-2ee91cede3ba?auto=format&fit=crop&w=1800&q=88");
            background-size: cover;
            background-position: center;
        }
        .hero::after {
            content: "";
            position: absolute;
            right: -12%;
            top: -22%;
            width: 58%;
            height: 150%;
            background: rgba(239,104,79,.83);
            clip-path: polygon(27% 0, 100% 0, 100% 100%, 0 100%);
            mix-blend-mode: multiply;
        }
        .hero-inner {
            position: relative;
            z-index: 1;
            width: 100%;
            padding: 82px 0 76px;
        }
        .hero-copy { max-width: 700px; }
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 20px;
            color: #ffd9d1;
            font-size: 13px;
            font-weight: 750;
            letter-spacing: 1px;
        }
        .eyebrow::before {
            content: "";
            width: 27px;
            height: 2px;
            background: var(--coral);
        }
        .hero h1 {
            max-width: 620px;
            margin: 0 0 20px;
            font-size: clamp(38px, 5vw, 66px);
            line-height: 1.12;
            letter-spacing: 0;
            font-weight: 800;
        }
        .hero h1 strong {
            display: inline-block;
            padding: 0 9px 4px;
            color: var(--blue-deep);
            background: #ffe0d8;
        }
        .hero-lead {
            max-width: 650px;
            margin: 0 0 16px;
            color: #f5f8fb;
            font-size: 19px;
            line-height: 1.8;
            font-weight: 500;
        }
        .hero-note {
            max-width: 650px;
            margin: 0 0 30px;
            color: #dce8f1;
            font-size: 15px;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
        .btn-primary { color: #fff; background: var(--coral); }
        .btn-light {
            color: #fff;
            border-color: rgba(255,255,255,.6);
            background: rgba(255,255,255,.08);
        }
        .btn-light:hover { background: #fff; color: var(--blue-deep); transform: translateY(-2px); }
        .hero-signal {
            display: flex;
            flex-wrap: wrap;
            gap: 22px;
            margin-top: 50px;
        }
        .signal {
            padding-left: 15px;
            border-left: 2px solid rgba(255,255,255,.55);
        }
        .signal b { display: block; font-size: 24px; line-height: 1.2; }
        .signal span { color: #dce8f1; font-size: 13px; }

        .section { padding: 92px 0; }
        .section-soft { background: var(--blue-pale); }
        .section-coral { background: var(--coral-pale); }
        .section-dark { color: #fff; background: var(--dark); }
        .section-heading {
            display: flex;
            align-items: end;
            justify-content: space-between;
            gap: 30px;
            margin-bottom: 36px;
        }
        .section-heading > div { max-width: 720px; }
        .section-kicker {
            margin: 0 0 9px;
            color: var(--coral-deep);
            font-size: 12px;
            font-weight: 800;
            letter-spacing: 1.5px;
        }
        .section h2 {
            margin: 0;
            color: inherit;
            font-size: clamp(27px, 3vw, 40px);
            line-height: 1.22;
            letter-spacing: 0;
            font-weight: 800;
        }
        .section-intro {
            margin: 13px 0 0;
            color: var(--muted);
            font-size: 16px;
        }
        .section-dark .section-intro { color: #b7c7d5; }
        .section-link {
            flex: 0 0 auto;
            color: var(--blue);
            font-size: 14px;
            font-weight: 750;
        }
        .section-link:hover { color: var(--coral-deep); }

        .metrics {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }
        .metric {
            min-height: 170px;
            padding: 30px 28px;
            border-right: 1px solid var(--line);
        }
        .metric:last-child { border-right: 0; }
        .metric-top { display: flex; justify-content: space-between; gap: 12px; }
        .metric-label { color: var(--muted); font-size: 14px; font-weight: 650; }
        .metric-icon { color: var(--coral); font-size: 20px; }
        .metric-value {
            margin: 15px 0 4px;
            color: var(--blue-deep);
            font-size: 39px;
            line-height: 1;
            font-weight: 800;
        }
        .metric-note { color: var(--soft); font-size: 13px; }
        .meter { height: 4px; margin-top: 18px; background: #e8eef3; border-radius: 5px; overflow: hidden; }
        .meter i { display: block; height: 100%; background: var(--coral); }

        .matrix {
            display: grid;
            grid-template-columns: 1.2fr .8fr .95fr;
            grid-template-rows: 1fr 1fr;
            gap: 14px;
        }
        .matrix-item {
            min-height: 165px;
            padding: 26px;
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: #fff;
            box-shadow: var(--shadow);
            transition: transform .2s ease, box-shadow .2s ease;
        }
        .matrix-item:first-child { grid-row: span 2; background: var(--blue-deep); color: #fff; }
        .matrix-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .matrix-icon {
            display: inline-grid;
            place-items: center;
            width: 36px;
            height: 36px;
            margin-bottom: 20px;
            color: #fff;
            background: var(--coral);
            border-radius: 8px;
            font-weight: 800;
        }
        .matrix-item h3 { margin: 0 0 8px; font-size: 19px; }
        .matrix-item p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
        .matrix-item:first-child p { color: #ccdae6; }

        .media-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }
        .media-card {
            min-width: 0;
            overflow: hidden;
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: #fff;
            box-shadow: var(--shadow);
            transition: transform .22s ease, box-shadow .22s ease;
        }
        .media-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
        .media-image {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: #dbe5ec;
        }
        .media-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .35s ease;
        }
        .media-card:hover .media-image img { transform: scale(1.05); }
        .play-mark {
            position: absolute;
            left: 13px;
            bottom: 12px;
            display: grid;
            place-items: center;
            width: 31px;
            height: 31px;
            color: #fff;
            background: rgba(23,37,54,.82);
            border-radius: 50%;
            font-size: 13px;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            min-height: 23px;
            padding: 2px 8px;
            border-radius: 5px;
            font-size: 11px;
            line-height: 1.3;
            font-weight: 750;
        }
        .badge-blue { color: #1d669d; background: #e3f2fb; }
        .badge-green { color: #197458; background: #e3f5ee; }
        .badge-coral { color: #b74432; background: #ffe8e2; }
        .badge-gray { color: #697789; background: #edf0f3; }
        .media-body { padding: 15px 16px 17px; }
        .media-body h3 {
            display: -webkit-box;
            min-height: 52px;
            margin: 0 0 9px;
            overflow: hidden;
            color: var(--ink);
            font-size: 16px;
            line-height: 1.6;
            font-weight: 750;
            -webkit-box-orient: vertical;
            -webkit-line-clamp: 2;
        }
        .media-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 8px;
            color: var(--soft);
            font-size: 12px;
        }
        .rating { color: var(--yellow); font-weight: 800; }
        .rating span { color: var(--ink); margin-left: 4px; }

        .feature-showcase {
            display: grid;
            grid-template-columns: 1.15fr .85fr;
            gap: 20px;
        }
        .feature-main {
            position: relative;
            min-height: 390px;
            display: flex;
            align-items: end;
            overflow: hidden;
            color: #fff;
            border-radius: var(--radius);
            background: #243b51;
        }
        .feature-main img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
        .feature-main::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(15,30,44,.9), rgba(15,30,44,.03) 72%);
        }
        .feature-copy { position: relative; z-index: 1; padding: 30px; }
        .feature-copy h3 { margin: 13px 0 8px; font-size: 28px; line-height: 1.3; }
        .feature-copy p { max-width: 470px; margin: 0; color: #dce7ee; }
        .compact-list { display: grid; gap: 12px; }
        .compact-item {
            display: grid;
            grid-template-columns: 104px 1fr;
            gap: 15px;
            min-height: 85px;
            padding: 10px;
            border: 1px solid var(--line);
            border-radius: 10px;
            background: #fff;
            transition: transform .2s ease, border-color .2s ease;
        }
        .compact-item:hover { transform: translateX(4px); border-color: #b8d0e2; }
        .compact-item img { width: 104px; height: 64px; object-fit: cover; border-radius: 6px; }
        .compact-item h4 { margin: 2px 0 6px; font-size: 15px; line-height: 1.4; }
        .compact-item p { margin: 0; color: var(--muted); font-size: 12px; }

        .category-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 15px;
        }
        .category-item {
            position: relative;
            min-height: 160px;
            padding: 25px;
            overflow: hidden;
            border: 1px solid var(--line);
            background: #fff;
            border-radius: var(--radius);
        }
        .category-item::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 5px;
            background: var(--coral);
        }
        .category-no { color: var(--blue); font-size: 13px; font-weight: 800; }
        .category-item h3 { margin: 9px 0 8px; font-size: 20px; }
        .category-item p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }

        .compare {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .compare-box {
            padding: 27px;
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: #fff;
        }
        .compare-box.featured { border: 2px solid var(--coral); }
        .compare-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--line);
        }
        .compare-head h3 { margin: 0; font-size: 20px; }
        .compare-list { display: grid; gap: 13px; margin: 19px 0 0; padding: 0; list-style: none; }
        .compare-list li { display: flex; justify-content: space-between; gap: 18px; color: var(--muted); font-size: 14px; }
        .compare-list b { color: var(--ink); font-weight: 750; text-align: right; }

        .timeline {
            position: relative;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            padding-top: 22px;
        }
        .timeline::before {
            content: "";
            position: absolute;
            top: 35px;
            left: 5%;
            right: 5%;
            height: 2px;
            background: #355671;
        }
        .milestone { position: relative; padding-top: 34px; }
        .milestone-dot {
            position: absolute;
            top: 0;
            left: 0;
            width: 17px;
            height: 17px;
            border: 4px solid var(--dark);
            border-radius: 50%;
            background: var(--coral);
            box-shadow: 0 0 0 4px rgba(239,104,79,.2);
        }
        .milestone time { color: #ffb7aa; font-size: 13px; font-weight: 750; }
        .milestone h3 { margin: 8px 0; font-size: 19px; }
        .milestone p { margin: 0; color: #b8c7d4; font-size: 14px; }

        .ranking-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 18px 34px;
        }
        .rank-list { display: grid; gap: 10px; }
        .rank-item {
            display: grid;
            grid-template-columns: 38px 1fr auto;
            align-items: center;
            gap: 13px;
            padding: 14px 16px;
            border-bottom: 1px solid var(--line);
            background: #fff;
        }
        .rank-no {
            display: grid;
            place-items: center;
            width: 29px;
            height: 29px;
            color: var(--blue-deep);
            background: var(--blue-pale);
            border-radius: 6px;
            font-size: 13px;
            font-weight: 800;
        }
        .rank-item:nth-child(-n+3) .rank-no { color: #fff; background: var(--coral); }
        .rank-title { min-width: 0; }
        .rank-title strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 15px; }
        .rank-title span { color: var(--soft); font-size: 12px; }
        .rank-score { color: var(--coral-deep); font-size: 14px; font-weight: 800; text-align: right; }

        .news-layout {
            display: grid;
            grid-template-columns: 1.1fr .9fr;
            gap: 28px;
        }
        .news-lead {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            overflow: hidden;
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: #fff;
        }
        .news-lead img { width: 100%; height: 100%; min-height: 240px; object-fit: cover; }
        .news-copy { padding: 25px; }
        .news-date { color: var(--coral-deep); font-size: 12px; font-weight: 800; }
        .news-copy h3 { margin: 13px 0 10px; font-size: 23px; line-height: 1.4; }
        .news-copy p { margin: 0; color: var(--muted); font-size: 14px; }
        .news-list { display: grid; gap: 12px; }
        .news-item {
            display: grid;
            grid-template-columns: 100px 1fr;
            gap: 14px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--line);
        }
        .news-item img { width: 100px; height: 72px; object-fit: cover; border-radius: 7px; }
        .news-item h3 { margin: 3px 0 5px; font-size: 15px; line-height: 1.5; }
        .news-item time { color: var(--soft); font-size: 12px; }

        .guarantee-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
        .guarantee {
            padding: 14px 25px;
            border-right: 1px solid #cad8e3;
        }
        .guarantee:first-child { padding-left: 0; }
        .guarantee:last-child { border-right: 0; }
        .guarantee-icon { color: var(--coral); font-size: 23px; font-weight: 800; }
        .guarantee h3 { margin: 9px 0 5px; font-size: 17px; }
        .guarantee p { margin: 0; color: var(--muted); font-size: 13px; }

        .quick-faq {
            display: grid;
            grid-template-columns: .85fr 1.15fr;
            gap: 60px;
            align-items: start;
        }
        .quick-list { display: grid; gap: 12px; margin-top: 25px; }
        .quick-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 16px;
            color: var(--blue-deep);
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            font-size: 14px;
            font-weight: 700;
        }
        .quick-item b { color: var(--coral); }
        .faq-list { display: grid; gap: 10px; }
        details {
            border-bottom: 1px solid var(--line);
            background: #fff;
        }
        summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            padding: 18px 4px;
            color: var(--ink);
            cursor: pointer;
            list-style: none;
            font-size: 16px;
            font-weight: 750;
        }
        summary::-webkit-details-marker { display: none; }
        summary::after { content: "+"; color: var(--coral); font-size: 22px; font-weight: 400; }
        details[open] summary::after { content: "−"; }
        details p { margin: -5px 28px 18px 4px; color: var(--muted); font-size: 14px; }

        .contact-section { background: #eaf3fa; }
        .contact-wrap {
            display: grid;
            grid-template-columns: .8fr 1.2fr;
            gap: 70px;
            align-items: start;
        }
        .contact-copy h2 { max-width: 430px; }
        .contact-copy p { max-width: 470px; margin: 17px 0 0; color: var(--muted); }
        .contact-points { display: grid; gap: 10px; margin-top: 26px; color: var(--blue-deep); font-size: 14px; font-weight: 700; }
        .contact-points span { display: flex; gap: 9px; align-items: center; }
        .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
        .field { display: grid; gap: 7px; }
        .field-full { grid-column: 1 / -1; }
        label { color: var(--ink); font-size: 13px; font-weight: 750; }
        label em { color: var(--coral); font-style: normal; }
        input, textarea, select {
            width: 100%;
            border: 1px solid #cbd9e4;
            border-radius: 7px;
            outline: 0;
            color: var(--ink);
            background: #fff;
            transition: border-color .2s ease, box-shadow .2s ease;
        }
        input, select { height: 46px; padding: 9px 13px; }
        textarea { min-height: 116px; padding: 11px 13px; resize: vertical; }
        input:hover, textarea:hover, select:hover { border-color: #9db8ce; }
        input:focus, textarea:focus, select:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(36,105,169,.12); }
        .form-bottom { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 18px; }
        .privacy { color: var(--soft); font-size: 12px; }
        .form-message { display: none; margin-top: 14px; padding: 11px 14px; color: var(--green); border: 1px solid #b9dfd1; border-radius: 7px; background: #effaf5; font-size: 13px; }
        .form-message.show { display: block; }

        .site-footer { color: #c3d0db; background: var(--dark); }
        .footer-main {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 45px;
            padding: 65px 0 48px;
        }
        .footer-brand .brand-name { color: #fff; }
        .footer-brand p { max-width: 290px; margin: 20px 0 0; color: #9fb0bf; font-size: 14px; }
        .footer-col h3 { margin: 0 0 17px; color: #fff; font-size: 15px; }
        .footer-col a { display: block; width: fit-content; margin: 8px 0; color: #aebdca; font-size: 13px; }
        .footer-col a:hover { color: #ffb0a2; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            padding: 20px 0;
            border-top: 1px solid #344656;
            color: #8799a9;
            font-size: 12px;
        }
        .back-top {
            position: fixed;
            right: 22px;
            bottom: 22px;
            z-index: 20;
            width: 42px;
            height: 42px;
            display: grid;
            place-items: center;
            border: 1px solid var(--line);
            border-radius: 8px;
            color: var(--blue-deep);
            background: #fff;
            box-shadow: var(--shadow);
            opacity: 0;
            pointer-events: none;
            transition: opacity .2s ease, transform .2s ease;
        }
        .back-top.visible { opacity: 1; pointer-events: auto; }
        .back-top:hover { transform: translateY(-3px); }

        @media (max-width: 1024px) {
            .main-nav { gap: 0; }
            .main-nav a { padding-left: 8px; padding-right: 8px; }
            .nav-cta { padding-left: 13px; padding-right: 13px; }
            .media-grid { grid-template-columns: repeat(3, 1fr); }
            .feature-showcase, .news-layout { grid-template-columns: 1fr; }
            .feature-main { min-height: 320px; }
            .footer-main { grid-template-columns: 1.5fr 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .container { width: min(100% - 32px, var(--container)); }
            .nav-wrap { min-height: 68px; }
            .menu-toggle { display: inline-grid; place-items: center; }
            .nav-cta { display: none; }
            .main-nav {
                position: fixed;
                top: 68px;
                left: 0;
                right: 0;
                display: none;
                align-items: stretch;
                flex-direction: column;
                padding: 14px 16px 22px;
                border-bottom: 1px solid var(--line);
                background: #fff;
                box-shadow: 0 14px 24px rgba(28,53,76,.12);
            }
            .main-nav.open { display: flex; }
            .main-nav a { padding: 13px 8px; border-bottom: 1px solid #eef2f5; }
            .main-nav a::after { left: 8px; right: auto; bottom: 8px; width: 25px; }
            .hero { min-height: 580px; }
            .hero::after { right: -35%; width: 85%; opacity: .65; }
            .hero-inner { padding: 62px 0 54px; }
            .hero h1 { font-size: 42px; }
            .hero-lead { font-size: 17px; }
            .section { padding: 66px 0; }
            .section-heading { display: block; margin-bottom: 26px; }
            .section-link { display: inline-block; margin-top: 18px; }
            .metrics { grid-template-columns: repeat(2, 1fr); }
            .metric:nth-child(2) { border-right: 0; }
            .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
            .matrix { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: auto; }
            .matrix-item:first-child { grid-column: 1 / -1; grid-row: auto; }
            .media-grid { grid-template-columns: repeat(2, 1fr); gap: 13px; }
            .category-grid, .ranking-layout { grid-template-columns: 1fr 1fr; }
            .timeline { grid-template-columns: repeat(2, 1fr); row-gap: 30px; }
            .timeline::before { display: none; }
            .guarantee-grid { grid-template-columns: repeat(2, 1fr); gap: 20px 0; }
            .guarantee { border-right: 0; border-bottom: 1px solid #cad8e3; }
            .guarantee:nth-child(odd) { padding-left: 0; }
            .guarantee:nth-child(even) { padding-right: 0; }
            .quick-faq, .contact-wrap { grid-template-columns: 1fr; gap: 35px; }
            .footer-main { grid-template-columns: 1.4fr 1fr 1fr; gap: 25px; }
            .footer-brand { grid-column: 1 / -1; }
        }

        @media (max-width: 520px) {
            .brand-name { font-size: 18px; }
            .brand-name small { display: none; }
            .hero h1 { font-size: 37px; }
            .hero-signal { gap: 14px; margin-top: 38px; }
            .signal { padding-left: 10px; }
            .signal b { font-size: 20px; }
            .metrics, .matrix, .category-grid, .ranking-layout { grid-template-columns: 1fr; }
            .metric { border-right: 0; border-bottom: 1px solid var(--line); }
            .metric:last-child { border-bottom: 0; }
            .matrix-item:first-child { grid-column: auto; }
            .media-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            .media-body { padding: 12px; }
            .media-body h3 { min-height: 48px; font-size: 14px; }
            .feature-main { min-height: 290px; }
            .feature-copy { padding: 22px; }
            .feature-copy h3 { font-size: 23px; }
            .compact-item { grid-template-columns: 88px 1fr; }
            .compact-item img { width: 88px; }
            .timeline { grid-template-columns: 1fr; gap: 21px; padding-left: 23px; }
            .milestone { padding-top: 0; padding-left: 18px; }
            .milestone-dot { left: -23px; top: 2px; }
            .news-lead { grid-template-columns: 1fr; }
            .news-lead img { min-height: 190px; }
            .form-grid { grid-template-columns: 1fr; }
            .field-full { grid-column: auto; }
            .form-bottom, .footer-bottom { align-items: flex-start; flex-direction: column; }
            .footer-main { grid-template-columns: 1fr 1fr; }
            .footer-brand { grid-column: 1 / -1; }
        }