/* roulang page: index */
:root{
            --ink:#14263d;
            --muted:#66758a;
            --blue:#1b5da7;
            --blue-dark:#123d70;
            --sky:#eaf3ff;
            --paper:#f7f9fc;
            --white:#ffffff;
            --line:#dce5ef;
            --gold:#e7ae52;
            --success:#2f8f6b;
            --radius:18px;
            --shadow:0 18px 45px rgba(28,57,92,.10);
            --shadow-soft:0 8px 24px rgba(28,57,92,.08);
            --container:1180px;
        }
        *{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth}
        body{
            font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",Arial,sans-serif;
            color:var(--ink);
            background:var(--paper);
            line-height:1.7;
            font-size:16px;
        }
        a{color:inherit;text-decoration:none}
        img{display:block;width:100%;height:100%;object-fit:cover}
        button,input{font:inherit}
        button{cursor:pointer;border:0}
        :focus-visible{outline:3px solid rgba(231,174,82,.8);outline-offset:4px}
        .container{width:min(var(--container),calc(100% - 48px));margin:0 auto}
        .site-header{
            height:78px;
            background:rgba(255,255,255,.96);
            border-bottom:1px solid var(--line);
            position:sticky;
            top:0;
            z-index:20;
            backdrop-filter:blur(12px);
        }
        .nav-wrap{height:100%;display:flex;align-items:center;justify-content:space-between;gap:28px}
        .brand{display:flex;align-items:center;gap:12px;font-weight:800;white-space:nowrap}
        .brand-mark{
            width:38px;height:38px;border-radius:11px;background:var(--blue);
            color:#fff;display:grid;place-items:center;font-weight:900;font-size:15px;
            box-shadow:0 7px 16px rgba(27,93,167,.22)
        }
        .brand-name{font-size:17px;letter-spacing:0}
        .nav-links{display:flex;align-items:center;gap:7px}
        .nav-links a{
            padding:9px 13px;border-radius:9px;color:var(--muted);font-size:14px;
            transition:.2s ease;
        }
        .nav-links a:hover,.nav-links a.active{color:var(--blue);background:var(--sky)}
        .nav-cta{
            display:inline-flex;align-items:center;gap:8px;padding:11px 17px;border-radius:10px;
            color:#fff!important;background:var(--blue)!important;font-weight:700!important;
            box-shadow:0 7px 15px rgba(27,93,167,.18)
        }
        .nav-cta:hover{background:var(--blue-dark)!important;transform:translateY(-1px)}
        .menu-toggle{display:none;background:transparent;color:var(--ink);font-size:25px}
        .hero{
            position:relative;overflow:hidden;background:#153e6c;color:#fff;
            min-height:620px;display:flex;align-items:center;
        }
        .hero:before{
            content:"";position:absolute;inset:0 31% 0 0;background:#1d6bb8;
            clip-path:polygon(0 0,88% 0,100% 50%,88% 100%,0 100%);
        }
        .hero:after{
            content:"";position:absolute;right:0;top:0;width:43%;height:100%;
            background:url("https://images.unsplash.com/photo-1489599849927-2ee91cede3ba?auto=format&fit=crop&w=1400&q=85") center/cover;
            opacity:.76;
        }
        .hero-inner{position:relative;z-index:1;padding:86px 0 92px;max-width:760px}
        .eyebrow{color:#d7eaff;font-size:13px;font-weight:800;letter-spacing:.12em;margin-bottom:18px}
        h1{font-size:clamp(38px,5vw,68px);line-height:1.14;letter-spacing:0;font-weight:900;max-width:760px}
        h1 span{color:#ffd989}
        .hero-lead{font-size:18px;color:#eaf3ff;max-width:680px;margin:24px 0 30px}
        .hero-copy{font-size:15px;line-height:1.9;color:#d5e5f7;max-width:710px}
        .hero-actions{display:flex;gap:13px;flex-wrap:wrap;margin-top:32px}
        .button{
            display:inline-flex;align-items:center;justify-content:center;gap:8px;
            min-height:48px;padding:0 21px;border-radius:10px;font-weight:800;
            transition:transform .2s ease,box-shadow .2s ease,background .2s ease;
        }
        .button:hover{transform:translateY(-2px);box-shadow:0 9px 20px rgba(0,0,0,.14)}
        .button-primary{background:var(--gold);color:#25334a}
        .button-secondary{background:#fff;color:var(--blue)}
        .button-outline{border:1px solid var(--line);background:#fff;color:var(--blue)}
        .section{padding:88px 0}
        .section-light{background:#fff}
        .section-blue{background:var(--sky)}
        .section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:34px}
        .section-kicker{font-size:12px;color:var(--blue);font-weight:900;letter-spacing:.12em;margin-bottom:8px}
        h2{font-size:clamp(27px,3vw,40px);line-height:1.25;letter-spacing:0}
        .section-intro{max-width:610px;color:var(--muted);font-size:15px}
        .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:-42px;position:relative;z-index:3}
        .stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:var(--shadow-soft)}
        .stat strong{font-size:29px;color:var(--blue);display:block;line-height:1.2}
        .stat span{display:block;color:var(--muted);font-size:14px;margin-top:7px}
        .feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
        .feature{padding:27px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-soft);transition:.25s}
        .feature:hover,.content-card:hover,.news-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
        .feature-icon{width:45px;height:45px;border-radius:12px;background:var(--sky);color:var(--blue);display:grid;place-items:center;font-size:21px;margin-bottom:20px}
        .feature h3{font-size:19px;margin-bottom:9px}
        .feature p{font-size:14px;color:var(--muted)}
        .lane-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px}
        .lane{border-radius:var(--radius);overflow:hidden;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-soft)}
        .lane-media{height:235px;position:relative}
        .lane-media:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(12,38,68,.68),transparent 65%)}
        .lane-label{position:absolute;left:22px;bottom:18px;z-index:1;color:#fff;font-weight:800;font-size:20px}
        .lane-body{padding:22px}
        .lane-body p{font-size:14px;color:var(--muted)}
        .lane-small{display:grid;grid-template-columns:155px 1fr}
        .lane-small .lane-media{height:100%}
        .verify{background:#153e6c;color:#fff}
        .verify-box{display:grid;grid-template-columns:1fr .85fr;gap:58px;align-items:center}
        .verify h2{color:#fff;margin-bottom:14px}
        .verify p{color:#d5e5f7;max-width:650px}
        .verify-panel{background:#fff;color:var(--ink);border-radius:16px;padding:26px;box-shadow:var(--shadow)}
        .verify-panel h3{font-size:20px;margin-bottom:7px}
        .verify-panel p{font-size:14px;color:var(--muted);margin-bottom:16px}
        .check-row{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--muted);margin:15px 0}
        .check-row input{margin-top:6px;accent-color:var(--blue)}
        .verify-message{display:none;color:var(--success);font-size:14px;margin-top:13px;font-weight:700}
        .verify-message.show{display:block}
        .content-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
        .content-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.25s;box-shadow:var(--shadow-soft)}
        .card-image{height:180px;position:relative}
        .badge{position:absolute;top:13px;left:13px;background:#fff;color:var(--blue);font-size:11px;font-weight:900;padding:4px 8px;border-radius:5px}
        .card-body{padding:17px}
        .card-body h3{font-size:16px;line-height:1.4;margin-bottom:8px}
        .card-meta{font-size:13px;color:var(--muted);display:flex;justify-content:space-between;gap:8px}
        .rating{color:#b57919;font-weight:800}
        .topic-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
        .topic{min-height:156px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:14px;display:flex;flex-direction:column;justify-content:space-between;transition:.2s}
        .topic:hover{border-color:#9dbfe2;box-shadow:var(--shadow-soft)}
        .topic b{font-size:18px}.topic p{font-size:13px;color:var(--muted)}
        .topic em{font-style:normal;color:var(--blue);font-weight:800;font-size:13px}
        .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
        .step{padding:25px 22px 0;border-right:1px solid var(--line);position:relative}
        .step:last-child{border-right:0}.step:before{content:"";display:block;width:13px;height:13px;border:3px solid var(--blue);background:#fff;border-radius:50%;position:absolute;top:-8px;left:22px}
        .step strong{display:block;color:var(--blue);font-size:14px;margin-bottom:8px}.step h3{font-size:18px;margin-bottom:7px}.step p{font-size:13px;color:var(--muted)}
        .quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
        .quote{padding:25px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-soft)}
        .quote p{font-size:15px;margin-bottom:18px}.quote footer{font-size:13px;color:var(--muted)}
        .compare{display:grid;grid-template-columns:1fr 1fr;gap:20px}
        .compare-col{padding:28px;border-radius:15px;border:1px solid var(--line);background:#fff}
        .compare-col.highlight{border:2px solid #8eb8df;background:#f5faff}
        .compare-col h3{font-size:20px;margin-bottom:18px}.compare-col ul{list-style:none}
        .compare-col li{padding:12px 0;border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}
        .compare-col li:last-child{border-bottom:0}.compare-col li:before{content:"✓";color:var(--success);font-weight:900;margin-right:9px}
        .news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:19px}
        .news-card{display:grid;grid-template-columns:112px 1fr;gap:16px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:13px;transition:.25s}
        .news-thumb{height:90px;border-radius:9px;overflow:hidden}
        .news-card h3{font-size:15px;line-height:1.5;margin-bottom:6px}.news-card time{font-size:12px;color:var(--muted)}
        .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
        details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px}
        summary{cursor:pointer;font-weight:800;list-style:none;position:relative;padding-right:25px}
        summary::-webkit-details-marker{display:none}
        summary:after{content:"+";position:absolute;right:0;color:var(--blue);font-size:21px;top:-3px}
        details[open] summary:after{content:"−"}
        details p{font-size:14px;color:var(--muted);padding-top:13px}
        .closing{padding:72px 0;background:#eaf3ff;text-align:center}
        .closing h2{max-width:720px;margin:0 auto 12px}.closing p{max-width:620px;margin:0 auto 25px;color:var(--muted)}
        .footer{background:#102b49;color:#c7d7e8;padding:56px 0 22px}
        .footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:35px;padding-bottom:38px}
        .footer .brand{color:#fff;margin-bottom:15px}.footer .brand-mark{background:var(--gold);color:#102b49}
        .footer p,.footer a{font-size:13px;color:#aebfd2}.footer h3{font-size:15px;color:#fff;margin-bottom:14px}.footer ul{list-style:none}.footer li{margin:7px 0}.footer a:hover{color:#fff}
        .copyright{border-top:1px solid rgba(255,255,255,.16);padding-top:18px;font-size:12px;color:#8fa7bf;display:flex;justify-content:space-between;gap:20px}
        @media (max-width:1024px){
            .hero:before{inset:0 22% 0 0}.hero:after{width:43%;opacity:.38}
            .content-grid{grid-template-columns:repeat(3,1fr)}.topic-grid{grid-template-columns:repeat(3,1fr)}
        }
        @media (max-width:768px){
            .container{width:min(var(--container),calc(100% - 32px))}
            .site-header{height:68px}.nav-links{display:none}.menu-toggle{display:block}
            .hero{min-height:650px}.hero:before{inset:0}.hero:after{display:none}.hero-inner{padding:74px 0}
            .hero-copy{font-size:14px}.stats{grid-template-columns:repeat(2,1fr);margin-top:20px}
            .section{padding:65px 0}.section-head{display:block}.section-intro{margin-top:12px}
            .feature-grid,.quote-grid,.news-grid{grid-template-columns:1fr}
            .lane-grid,.verify-box,.compare{grid-template-columns:1fr;gap:20px}
            .lane-small{grid-template-columns:125px 1fr}.content-grid{grid-template-columns:repeat(2,1fr)}
            .topic-grid{grid-template-columns:repeat(2,1fr)}.timeline{grid-template-columns:1fr 1fr;border-top:0;gap:22px}
            .step{border-right:0;border-top:1px solid var(--line);padding-top:21px}.step:before{top:-8px}
            .faq-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}
        }
        @media (max-width:520px){
            h1{font-size:39px}.hero-lead{font-size:16px}.hero-actions .button{width:100%}
            .stats,.content-grid,.topic-grid{grid-template-columns:1fr}.stat{padding:19px}
            .lane-small{display:block}.lane-small .lane-media{height:180px}.timeline{grid-template-columns:1fr}
            .footer-grid{grid-template-columns:1fr;gap:24px}.copyright{display:block}.copyright span{display:block;margin-top:7px}
        }