/* roulang page: index */
:root{
            --ink:#18212b;
            --muted:#687582;
            --soft:#f4f7f8;
            --paper:#ffffff;
            --line:#e5ebee;
            --teal:#087f82;
            --teal-dark:#075d62;
            --mint:#d8f2ee;
            --coral:#f06d56;
            --gold:#e9b95e;
            --shadow:0 18px 45px rgba(20,47,55,.10);
            --small-shadow:0 8px 22px rgba(20,47,55,.08);
            --radius:18px;
            --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:15px}
        img{display:block;width:100%;object-fit:cover}
        a{color:inherit;text-decoration:none}
        button,input{font:inherit}
        button{cursor:pointer;border:0}
        .container{width:min(var(--container),calc(100% - 40px));margin:0 auto}
        .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--teal);font-size:12px;font-weight:800;letter-spacing:1.2px;text-transform:uppercase}
        .eyebrow:before{content:"";width:24px;height:2px;background:var(--coral)}
        h1,h2,h3{line-height:1.2;letter-spacing:0}
        h2{font-size:clamp(27px,3vw,40px);margin:10px 0 14px}
        .section-head{max-width:700px;margin-bottom:30px}
        .section-head p{color:var(--muted);font-size:15px;max-width:680px}
        .site-header{height:78px;display:flex;align-items:center;border-bottom:1px solid rgba(229,235,238,.85);background:rgba(255,255,255,.94);position:sticky;top:0;z-index:20;backdrop-filter:blur(16px)}
        .nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:28px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:900;white-space:nowrap}
        .brand-mark{width:37px;height:37px;border-radius:11px;background:var(--teal);display:grid;place-items:center;color:white;font-size:17px;box-shadow:0 6px 16px rgba(8,127,130,.24)}
        .brand-name{font-size:17px}
        .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{background:var(--mint);color:var(--teal-dark)}
        .nav-action{padding:10px 17px!important;background:var(--ink)!important;color:white!important;border-radius:9px!important}
        .nav-action:hover{background:var(--teal-dark)!important}
        .menu-btn{display:none;background:none;font-size:24px;color:var(--ink)}
        .hero{min-height:590px;background:#eaf4f3;position:relative;overflow:hidden;display:flex;align-items:center}
        .hero:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(234,244,243,.98) 0%,rgba(234,244,243,.83) 42%,rgba(234,244,243,.08) 100%);z-index:1}
        .hero-photo{position:absolute;inset:0 0 0 43%;background:url("https://images.unsplash.com/photo-1492724441997-5dc865305da7?auto=format&fit=crop&w=1600&q=88") center/cover}
        .hero-inner{position:relative;z-index:2;padding:82px 0 78px}
        .hero-copy{max-width:590px}
        .hero h1{font-size:clamp(40px,5vw,67px);max-width:600px;margin:18px 0 19px}
        .hero h1 em{font-style:normal;color:var(--coral)}
        .hero-lead{font-size:17px;color:#4b6268;line-height:1.9;max-width:570px}
        .hero-actions{display:flex;gap:12px;margin-top:29px;flex-wrap:wrap}
        .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:9px;padding:12px 20px;font-weight:800;transition:.22s ease}
        .btn-primary{background:var(--teal);color:white;box-shadow:0 8px 18px rgba(8,127,130,.2)}
        .btn-primary:hover{background:var(--teal-dark);transform:translateY(-2px)}
        .btn-outline{border:1px solid #a9c9c7;color:var(--teal-dark);background:rgba(255,255,255,.6)}
        .btn-outline:hover{background:white;border-color:var(--teal)}
        .hero-note{display:flex;gap:24px;margin-top:43px;padding-top:18px;border-top:1px solid rgba(8,127,130,.18);max-width:520px}
        .hero-note strong{display:block;font-size:22px;color:var(--teal-dark)}
        .hero-note span{font-size:12px;color:var(--muted)}
        section{padding:88px 0}
        .section-soft{background:var(--soft)}
        .section-dark{background:#172d34;color:white}
        .section-dark .section-head p{color:#afc6c8}
        .category-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
        .category{min-height:154px;padding:22px 18px;border:1px solid var(--line);background:white;border-radius:var(--radius);position:relative;overflow:hidden;transition:.22s}
        .category:after{content:"↗";position:absolute;right:17px;bottom:12px;color:var(--coral);font-size:22px}
        .category:hover{transform:translateY(-5px);box-shadow:var(--small-shadow);border-color:#b9dcd8}
        .category-icon{font-size:26px;margin-bottom:12px}
        .category h3{font-size:17px;margin-bottom:7px}
        .category p{font-size:13px;color:var(--muted);line-height:1.65}
        .feature-row{display:grid;grid-template-columns:1.45fr .8fr .8fr;gap:16px}
        .feature-card{height:350px;border-radius:var(--radius);overflow:hidden;position:relative;background:#244b50}
        .feature-card img{height:100%;transition:.4s}
        .feature-card:hover img{transform:scale(1.04)}
        .feature-card:after{content:"";position:absolute;inset:35% 0 0;background:linear-gradient(transparent,rgba(7,27,31,.9))}
        .feature-copy{position:absolute;z-index:2;left:22px;right:22px;bottom:20px;color:white}
        .feature-copy h3{font-size:22px;margin:9px 0 5px}
        .feature-copy p{font-size:13px;color:#d7e5e4}
        .tag{display:inline-flex;align-items:center;padding:4px 8px;border-radius:5px;background:var(--coral);color:white;font-size:11px;font-weight:800}
        .tag.teal{background:var(--teal)}
        .tag.gold{background:var(--gold);color:#4c3916}
        .stats-band{padding:32px 0;background:#0f6267;color:white}
        .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
        .stat{border-left:1px solid rgba(255,255,255,.25);padding-left:20px}
        .stat strong{display:block;font-size:30px;line-height:1.2}
        .stat span{font-size:13px;color:#c2dddd}
        .rank-layout{display:grid;grid-template-columns:1.15fr .85fr;gap:50px;align-items:start}
        .rank-list{list-style:none;border-top:1px solid var(--line)}
        .rank-item{display:grid;grid-template-columns:42px 1fr auto auto;gap:16px;align-items:center;padding:15px 0;border-bottom:1px solid var(--line)}
        .rank-no{font-size:21px;font-weight:900;color:#b9c4c5}
        .rank-item:nth-child(-n+3) .rank-no{color:var(--coral)}
        .rank-title{font-weight:800}
        .rank-meta{display:block;font-size:12px;color:var(--muted)}
        .heat{font-size:12px;color:var(--teal);font-weight:800}
        .score{font-weight:900;color:#c28426}
        .quote-panel{background:#e7f4f1;border-radius:var(--radius);padding:30px}
        .quote-panel .quote-mark{font-size:54px;color:var(--coral);line-height:.8}
        .quote-panel blockquote{font-size:21px;font-weight:800;line-height:1.55;margin:15px 0 23px}
        .quote-author{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px}
        .avatar{width:38px;height:38px;border-radius:50%;background:url("https://images.unsplash.com/photo-1494790108377-be9c29b29330?auto=format&fit=crop&w=100&q=80") center/cover}
        .promise-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
        .promise{padding:24px 20px;background:#20434a;border:1px solid rgba(255,255,255,.12);border-radius:14px}
        .promise b{display:block;color:#8de1d1;font-size:23px;margin-bottom:10px}
        .promise h3{font-size:17px;margin-bottom:8px}
        .promise p{font-size:13px;color:#bdd0d0;line-height:1.7}
        .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative}
        .steps:before{content:"";position:absolute;top:26px;left:8%;right:8%;height:1px;background:#cbdedd}
        .step{position:relative;padding:0 20px;text-align:center}
        .step-no{width:52px;height:52px;border-radius:50%;margin:0 auto 20px;background:white;border:1px solid #b5d7d3;color:var(--teal);display:grid;place-items:center;font-size:17px;font-weight:900;position:relative;z-index:1}
        .step h3{font-size:17px;margin-bottom:9px}
        .step p{font-size:13px;color:var(--muted)}
        .news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}
        .news-card{display:grid;grid-template-columns:120px 1fr;gap:15px;padding:12px;border:1px solid var(--line);border-radius:13px;transition:.2s}
        .news-card:hover{box-shadow:var(--small-shadow);transform:translateY(-3px)}
        .news-card img{height:100px;border-radius:9px}
        .news-card time{font-size:11px;color:var(--coral)}
        .news-card h3{font-size:16px;margin:5px 0}
        .news-card p{font-size:12px;color:var(--muted);line-height:1.55}
        .topics{display:flex;flex-wrap:wrap;gap:10px}
        .topic{padding:10px 15px;border:1px solid #c9dfdc;border-radius:30px;color:var(--teal-dark);background:#f4fbfa;transition:.2s}
        .topic:hover{background:var(--teal);color:white}
        .calendar{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
        .day{padding:18px 15px;border-left:3px solid var(--teal);background:white;box-shadow:var(--small-shadow)}
        .day time{color:var(--coral);font-size:12px;font-weight:800}
        .day h3{font-size:15px;margin:8px 0}
        .day p{font-size:12px;color:var(--muted)}
        .faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:13px}
        .faq{padding:22px;background:white;border:1px solid var(--line);border-radius:12px}
        .faq h3{font-size:16px;margin-bottom:9px}
        .faq p{font-size:13px;color:var(--muted);line-height:1.75}
        .contact-panel{background:#f1f8f6;padding:44px;border-radius:var(--radius);display:flex;align-items:center;justify-content:space-between;gap:30px}
        .contact-panel h2{max-width:620px}
        .contact-panel p{color:var(--muted);max-width:650px}
        .site-footer{background:#13262d;color:#d5e1e1;padding:58px 0 25px}
        .footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:38px;padding-bottom:45px}
        .footer-brand p{color:#91abad;font-size:13px;max-width:270px;margin-top:15px}
        .site-footer h3{font-size:14px;color:white;margin-bottom:15px}
        .site-footer li{list-style:none;margin:8px 0;color:#91abad;font-size:13px}
        .site-footer a:hover{color:#8de1d1}
        .copyright{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;color:#789496;font-size:12px;display:flex;justify-content:space-between;gap:20px}
        :focus-visible{outline:3px solid rgba(240,109,86,.55);outline-offset:3px}
        @media(max-width:1024px){
            .category-grid{grid-template-columns:repeat(3,1fr)}
            .feature-row{grid-template-columns:1.2fr 1fr}
            .feature-card:last-child{display:none}
            .promise-grid{grid-template-columns:repeat(2,1fr)}
            .news-grid{grid-template-columns:repeat(2,1fr)}
            .calendar{grid-template-columns:repeat(3,1fr)}
            .footer-grid{grid-template-columns:1.4fr repeat(2,1fr)}
        }
        @media(max-width:768px){
            .site-header{height:68px}
            .menu-btn{display:block}
            .nav-links{display:none;position:absolute;top:68px;left:0;right:0;padding:12px 20px 18px;background:white;border-bottom:1px solid var(--line);box-shadow:var(--small-shadow);flex-direction:column;align-items:stretch}
            .nav-links.open{display:flex}
            .nav-links a{padding:12px}
            .hero{min-height:650px}
            .hero-photo{inset:0;opacity:.25}
            .hero:after{background:rgba(234,244,243,.88)}
            .hero-inner{padding:65px 0}
            .hero h1{font-size:44px}
            section{padding:65px 0}
            .stats{grid-template-columns:repeat(2,1fr);gap:24px}
            .rank-layout{grid-template-columns:1fr;gap:30px}
            .steps{grid-template-columns:repeat(2,1fr);gap:28px 0}
            .steps:before{display:none}
            .contact-panel{display:block;padding:30px}
            .contact-panel .btn{margin-top:20px}
        }
        @media(max-width:520px){
            .container{width:min(100% - 28px,var(--container))}
            .brand-name{font-size:15px}
            .hero h1{font-size:38px}
            .hero-lead{font-size:15px}
            .hero-note{gap:14px}
            .category-grid,.feature-row,.promise-grid,.news-grid,.faq-grid,.calendar{grid-template-columns:1fr}
            .feature-card{height:285px}
            .feature-card:last-child{display:block}
            .rank-item{grid-template-columns:30px 1fr auto}
            .rank-item .score{display:none}
            .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
            .footer-brand{grid-column:1/-1}
            .copyright{display:block}
            .copyright span{display:block;margin-top:8px}
        }