/* roulang page: index */
:root {
            --ink: #152b3a;
            --ink-soft: #385466;
            --navy: #102633;
            --blue: #2b6f91;
            --blue-deep: #1f526c;
            --gold: #d29a48;
            --gold-light: #f5e5c9;
            --paper: #f7f8f6;
            --white: #ffffff;
            --muted: #71808a;
            --line: #dbe3e6;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 26px;
            --shadow-sm: 0 8px 22px rgba(20, 48, 63, .07);
            --shadow-md: 0 18px 42px rgba(20, 48, 63, .12);
            --ease: 220ms ease;
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            background: var(--paper);
            color: var(--ink);
            font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            font-size: 16px;
            line-height: 1.75;
        }
        h1, h2, h3, h4, p { margin-top: 0; }
        h1, h2, h3, h4 { color: var(--ink); font-weight: 800; line-height: 1.25; }
        a { color: inherit; text-decoration: none; transition: color var(--ease), background var(--ease), transform var(--ease), box-shadow var(--ease); }
        img { display: block; max-width: 100%; }
        button, input, textarea, select { font: inherit; }
        button { cursor: pointer; }
        :focus-visible { outline: 3px solid rgba(210, 154, 72, .7); outline-offset: 3px; }

        .container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
        .section { padding: 100px 0; }
        .section--tight { padding: 72px 0; }
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--blue);
            font-size: 12px;
            font-weight: 800;
            letter-spacing: .16em;
            text-transform: uppercase;
            margin-bottom: 18px;
        }
        .eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--gold); }
        .section-heading { max-width: 680px; margin-bottom: 44px; }
        .section-heading h2 { font-size: clamp(30px, 4vw, 46px); margin-bottom: 16px; }
        .section-heading p { color: var(--muted); font-size: 17px; margin-bottom: 0; }

        .site-header {
            position: sticky;
            z-index: 20;
            top: 0;
            background: rgba(16, 38, 51, .97);
            border-bottom: 1px solid rgba(255,255,255,.1);
            box-shadow: 0 8px 22px rgba(7, 25, 35, .12);
        }
        .topbar { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
        .brand { display: inline-flex; align-items: center; gap: 12px; color: var(--white); font-size: 19px; font-weight: 900; white-space: nowrap; }
        .brand-mark {
            width: 36px; height: 36px; border: 2px solid var(--gold);
            display: grid; place-items: center; border-radius: 50%;
            color: var(--gold); font-size: 13px; font-weight: 900;
        }
        .brand:hover { color: var(--gold-light); }
        .main-nav { display: flex; align-items: center; gap: 28px; margin-left: auto; }
        .main-nav a { color: #d7e4e8; font-size: 14px; font-weight: 700; position: relative; }
        .main-nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -9px; height: 2px; background: var(--gold); transform: scaleX(0); transition: transform var(--ease); }
        .main-nav a:hover, .main-nav a.active { color: var(--white); }
        .main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }
        .nav-cta, .button-primary {
            display: inline-flex; align-items: center; justify-content: center; gap: 9px;
            border: 0; border-radius: 7px; background: var(--gold); color: #182e38;
            font-size: 14px; font-weight: 900; padding: 12px 20px;
            box-shadow: 0 7px 16px rgba(210,154,72,.2);
        }
        .nav-cta:hover, .button-primary:hover { color: #102633; background: #e5b566; transform: translateY(-2px); box-shadow: 0 11px 22px rgba(210,154,72,.28); }
        .menu-toggle { display: none; border: 1px solid rgba(255,255,255,.2); background: transparent; color: var(--white); border-radius: 6px; padding: 7px 10px; }

        .hero {
            position: relative; overflow: hidden; background: var(--navy); color: var(--white);
            padding: 88px 0 92px;
        }
        .hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(112deg, rgba(16,38,51,.98) 20%, rgba(16,38,51,.82) 55%, rgba(16,38,51,.58)); }
        .hero::after { content: ""; position: absolute; width: 520px; height: 520px; border: 1px solid rgba(210,154,72,.22); border-radius: 50%; right: -180px; top: -170px; }
        .hero .container { position: relative; z-index: 1; }
        .hero-grid { display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(400px, .97fr); gap: 72px; align-items: center; }
        .hero h1 { max-width: 680px; color: var(--white); font-size: clamp(42px, 6vw, 76px); letter-spacing: -.04em; margin-bottom: 24px; }
        .hero h1 span { color: var(--gold); }
        .hero-copy { max-width: 630px; color: #cbd9dd; font-size: 18px; margin-bottom: 30px; }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-bottom: 38px; }
        .button-ghost { display: inline-flex; align-items: center; justify-content: center; padding: 11px 19px; border: 1px solid rgba(255,255,255,.34); color: var(--white); border-radius: 7px; font-weight: 800; }
        .button-ghost:hover { background: rgba(255,255,255,.1); color: var(--white); border-color: var(--gold); }
        .hero-metrics { display: flex; flex-wrap: wrap; gap: 32px; }
        .metric strong { display: block; color: var(--white); font-size: 27px; line-height: 1.1; }
        .metric span { color: #9fb2b9; font-size: 13px; }
        .hero-stage { position: relative; min-height: 430px; }
        .stage-main { position: absolute; inset: 20px 0 0 48px; overflow: hidden; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); border: 8px solid rgba(255,255,255,.09); }
        .stage-main img { width: 100%; height: 100%; object-fit: cover; }
        .stage-main::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, rgba(11,28,38,.82)); }
        .stage-label { position: absolute; z-index: 2; left: 26px; right: 26px; bottom: 22px; color: var(--white); }
        .stage-label small { color: var(--gold-light); font-weight: 800; }
        .stage-label strong { display: block; font-size: 23px; margin-top: 5px; }
        .stage-note { position: absolute; z-index: 3; left: 0; top: 0; width: 180px; padding: 18px; background: var(--white); color: var(--ink); border-radius: 12px; box-shadow: var(--shadow-md); }
        .stage-note b { display: block; color: var(--blue); font-size: 27px; }
        .stage-note span { display: block; color: var(--muted); font-size: 13px; line-height: 1.5; }
        .stage-stamp { position: absolute; z-index: 3; right: -12px; bottom: 24px; width: 100px; height: 100px; border: 1px solid var(--gold); border-radius: 50%; display: grid; place-items: center; color: var(--gold-light); text-align: center; font-size: 12px; line-height: 1.35; background: rgba(16,38,51,.9); }

        .intro-band { background: var(--white); border-bottom: 1px solid var(--line); }
        .intro-band .container { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
        .intro-band h2 { font-size: 32px; margin: 0; }
        .intro-band p { margin: 0; color: var(--muted); }

        .selling-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
        .selling-card { min-height: 245px; padding: 30px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease); }
        .selling-card:hover { transform: translateY(-5px); border-color: #b8cfd8; box-shadow: var(--shadow-md); }
        .icon-tile { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 10px; background: var(--gold-light); color: var(--blue-deep); font-weight: 900; font-size: 18px; margin-bottom: 26px; }
        .selling-card h3 { font-size: 22px; margin-bottom: 10px; }
        .selling-card p { color: var(--muted); font-size: 15px; margin: 0; }

        .stats-section { background: #edf3f4; }
        .stats-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 64px; align-items: center; }
        .stats-layout h2 { font-size: 39px; margin-bottom: 18px; }
        .stats-layout > div > p { color: var(--muted); }
        .stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
        .stat-box { padding: 24px; background: var(--white); border-left: 4px solid var(--gold); border-radius: 5px; box-shadow: var(--shadow-sm); }
        .stat-box strong { display: block; color: var(--blue-deep); font-size: 34px; line-height: 1; margin-bottom: 8px; }
        .stat-box span { color: var(--muted); font-size: 14px; }

        .path-section { background: var(--white); }
        .path-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 70px; align-items: start; }
        .path-image { height: 430px; overflow: hidden; border-radius: var(--radius-lg); }
        .path-image img { width: 100%; height: 100%; object-fit: cover; }
        .path-list { border-top: 1px solid var(--line); }
        .path-item { display: grid; grid-template-columns: 46px 1fr; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--line); }
        .path-num { color: var(--gold); font-size: 22px; font-weight: 900; }
        .path-item h3 { font-size: 20px; margin-bottom: 5px; }
        .path-item p { margin: 0; color: var(--muted); font-size: 15px; }

        .feature-section { background: var(--paper); }
        .feature-board { display: grid; grid-template-columns: 1.25fr .75fr; gap: 18px; }
        .feature-card { position: relative; min-height: 280px; overflow: hidden; border-radius: var(--radius-md); background: var(--navy); }
        .feature-card.large { min-height: 450px; }
        .feature-card img { width: 100%; height: 100%; object-fit: cover; opacity: .65; transition: transform .5s ease; }
        .feature-card:hover img { transform: scale(1.04); }
        .feature-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 30%, rgba(10,26,36,.92)); }
        .feature-content { position: absolute; z-index: 1; left: 28px; right: 28px; bottom: 26px; color: var(--white); }
        .feature-content h3 { color: var(--white); font-size: 25px; margin: 8px 0; }
        .feature-content p { color: #d4e0e3; font-size: 14px; margin-bottom: 0; }
        .feature-stack { display: grid; gap: 18px; }
        .feature-stack .feature-card { min-height: 216px; }

        .news-section { background: var(--white); }
        .news-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 70px; }
        .news-list { border-top: 1px solid var(--line); }
        .news-item { display: flex; justify-content: space-between; gap: 20px; align-items: center; padding: 19px 0; border-bottom: 1px solid var(--line); }
        .news-item a { font-size: 16px; font-weight: 800; }
        .news-item a:hover { color: var(--blue); }
        .news-date { color: var(--muted); white-space: nowrap; font-size: 13px; }
        .recommend { padding: 28px; border-radius: var(--radius-md); background: var(--navy); color: var(--white); }
        .recommend h3 { color: var(--white); font-size: 23px; }
        .recommend p { color: #b8c8cd; font-size: 14px; }
        .tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
        .tag { display: inline-flex; padding: 6px 11px; border-radius: 30px; background: rgba(255,255,255,.11); color: #d8e6e9; font-size: 12px; }

        .faq-section { background: #edf3f4; }
        .faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
        .faq-item { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-sm); }
        .faq-item summary { cursor: pointer; list-style: none; padding: 20px 24px; font-weight: 800; position: relative; padding-right: 54px; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after { content: "+"; position: absolute; right: 22px; color: var(--gold); font-size: 24px; line-height: 1; }
        .faq-item[open] summary::after { content: "−"; }
        .faq-answer { padding: 0 24px 22px; color: var(--muted); font-size: 14px; }

        .contact-section { background: var(--white); }
        .contact-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; align-items: center; }
        .contact-layout h2 { font-size: 40px; }
        .contact-layout p { color: var(--muted); }
        .contact-form { padding: 30px; border: 1px solid var(--line); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
        label { display: block; color: var(--ink-soft); font-size: 13px; font-weight: 800; margin-bottom: 7px; }
        input, textarea { width: 100%; border: 1px solid var(--line); border-radius: 6px; background: #fbfcfb; padding: 12px 14px; color: var(--ink); margin-bottom: 17px; }
        input:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(43,111,145,.12); outline: none; }
        textarea { min-height: 106px; resize: vertical; }
        .form-note { color: var(--muted); font-size: 12px; margin: 13px 0 0; }
        .button-primary { padding: 13px 24px; }

        .fixed-cta { position: fixed; z-index: 18; right: 24px; bottom: 24px; display: inline-flex; align-items: center; gap: 10px; padding: 13px 18px; color: #172c37; background: var(--gold); border-radius: 30px; font-size: 13px; font-weight: 900; box-shadow: 0 14px 30px rgba(35,52,60,.2); }
        .fixed-cta:hover { background: #e5b566; transform: translateY(-2px); }

        .site-footer { padding: 46px 0 28px; background: var(--navy); color: #aebfc5; }
        .footer-top { display: flex; justify-content: space-between; gap: 50px; padding-bottom: 32px; border-bottom: 1px solid rgba(255,255,255,.13); }
        .footer-brand { color: var(--white); font-weight: 900; font-size: 18px; margin-bottom: 10px; }
        .footer-top p { max-width: 480px; margin: 0; font-size: 13px; }
        .footer-links { display: flex; align-items: flex-start; gap: 26px; }
        .footer-links a { color: #c7d5d9; font-size: 13px; }
        .footer-links a:hover { color: var(--gold); }
        .footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 22px; color: #80969e; font-size: 12px; }

        @media (max-width: 1024px) {
            .hero-grid, .stats-layout, .path-layout, .contact-layout { gap: 38px; }
            .hero h1 { font-size: 58px; }
            .stage-main { left: 25px; }
        }
        @media (max-width: 768px) {
            .container { width: min(100% - 34px, 620px); }
            .section { padding: 70px 0; }
            .topbar { min-height: 66px; }
            .menu-toggle { display: block; }
            .main-nav { display: none; position: absolute; top: 66px; left: 0; right: 0; padding: 18px; background: var(--navy); border-top: 1px solid rgba(255,255,255,.1); flex-direction: column; align-items: stretch; gap: 0; }
            .main-nav.is-open { display: flex; }
            .main-nav a { padding: 12px 4px; }
            .nav-cta { margin-top: 8px; text-align: center; }
            .hero { padding: 66px 0 72px; }
            .hero-grid, .intro-band .container, .stats-layout, .path-layout, .news-layout, .contact-layout { grid-template-columns: 1fr; }
            .hero h1 { font-size: clamp(40px, 11vw, 58px); }
            .hero-stage { min-height: 390px; margin-top: 25px; }
            .selling-grid, .faq-grid { grid-template-columns: 1fr; }
            .feature-board { grid-template-columns: 1fr; }
            .feature-card.large { min-height: 360px; }
            .feature-stack { grid-template-columns: 1fr 1fr; }
            .feature-stack .feature-card { min-height: 240px; }
            .footer-top, .footer-bottom { flex-direction: column; gap: 18px; }
        }
        @media (max-width: 520px) {
            .container { width: min(100% - 28px, 460px); }
            .brand { font-size: 15px; }
            .brand-mark { width: 31px; height: 31px; font-size: 11px; }
            .hero-copy { font-size: 16px; }
            .hero-actions a { width: 100%; }
            .hero-metrics { gap: 20px; }
            .stage-main { inset: 42px 0 0 0; }
            .stage-note { width: 155px; padding: 14px; }
            .stage-stamp { right: -3px; bottom: 12px; width: 78px; height: 78px; font-size: 10px; }
            .stats-grid, .feature-stack { grid-template-columns: 1fr; }
            .feature-stack .feature-card { min-height: 220px; }
            .news-item { align-items: flex-start; flex-direction: column; gap: 4px; }
            .contact-form { padding: 22px; }
            .fixed-cta { right: 14px; bottom: 14px; }
        }