/* roulang page: index */
:root{
      --blue:#2563eb;
      --blue-dark:#1745aa;
      --ink:#17233d;
      --muted:#66738b;
      --line:#dce6f4;
      --pale:#f5f8fd;
      --sky:#eaf3ff;
      --orange:#ef8f4b;
      --shadow:0 18px 50px rgba(39,76,133,.10);
      --soft-shadow:0 8px 28px rgba(39,76,133,.08);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased}
    a{color:inherit;text-decoration:none}
    img{display:block;width:100%;max-width:100%;object-fit:cover}
    button,input,textarea{font:inherit}
    button{cursor:pointer}
    :focus-visible{outline:3px solid rgba(37,99,235,.32);outline-offset:3px}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);border-bottom:1px solid rgba(220,230,244,.9);backdrop-filter:blur(12px)}
    .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .logo{display:inline-flex;align-items:center;gap:10px;font-size:21px;font-weight:800;letter-spacing:-.04em;color:var(--ink);white-space:nowrap}
    .logo-mark{width:34px;height:34px;border-radius:11px;background:var(--blue);display:grid;place-items:center;color:#fff;font-size:15px;box-shadow:0 7px 16px rgba(37,99,235,.22)}
    .nav-links{display:flex;align-items:center;gap:26px;margin-left:auto}
    .nav-links a{font-size:14px;color:#59677f;transition:.2s}
    .nav-links a:hover,.nav-links a.active{color:var(--blue)}
    .nav-search{height:40px;display:flex;align-items:center;gap:8px;padding:0 13px;border:1px solid var(--line);border-radius:12px;color:var(--muted);background:#fff}
    .nav-search input{width:118px;border:0;outline:0;font-size:13px;color:var(--ink)}
    .nav-cta,.primary-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--blue);background:var(--blue);color:#fff;border-radius:11px;padding:11px 18px;font-size:14px;font-weight:700;transition:.2s;box-shadow:0 8px 18px rgba(37,99,235,.17)}
    .nav-cta:hover,.primary-btn:hover{background:var(--blue-dark);transform:translateY(-2px)}
    .secondary-btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:#fff;color:var(--blue);border-radius:11px;padding:11px 18px;font-size:14px;font-weight:700;transition:.2s}
    .secondary-btn:hover{border-color:var(--blue);background:var(--sky);transform:translateY(-2px)}
    .section{padding:96px 0}
    .section.alt{background:var(--pale)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-size:13px;font-weight:800;letter-spacing:.08em}
    .eyebrow:before{content:"";width:22px;height:2px;background:var(--blue);border-radius:3px}
    h1,h2,h3,p{margin-top:0}
    h1{font-size:clamp(36px,5vw,58px);line-height:1.18;letter-spacing:-.055em;margin-bottom:24px}
    h2{font-size:clamp(28px,3.3vw,38px);line-height:1.25;letter-spacing:-.045em;margin-bottom:16px}
    h3{font-size:19px;line-height:1.4;margin-bottom:9px}
    .section-head{max-width:690px;margin-bottom:42px}
    .section-head p,.hero-copy p{color:var(--muted);font-size:16px}
    .hero{padding:74px 0 86px;background:linear-gradient(180deg,#f7fbff 0%,#fff 100%);overflow:hidden}
    .hero-layout{display:grid;grid-template-columns:1fr 1.06fr;gap:70px;align-items:center}
    .hero-copy{max-width:600px}
    .hero-copy p{font-size:17px;line-height:1.9;margin-bottom:28px}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap}
    .hero-note{display:flex;align-items:center;gap:15px;margin-top:25px;color:#718097;font-size:13px}
    .note-dot{width:9px;height:9px;border-radius:50%;background:#34b88a;box-shadow:0 0 0 5px #e5f8f0}
    .hero-visual{position:relative;min-height:435px}
    .hero-image{height:435px;border-radius:26px;box-shadow:var(--shadow);object-fit:cover}
    .hero-overlay{position:absolute;inset:auto 22px 22px 22px;background:rgba(255,255,255,.94);border:1px solid rgba(255,255,255,.8);padding:20px;border-radius:17px;box-shadow:var(--soft-shadow)}
    .hero-overlay small{color:var(--blue);font-weight:800}
    .hero-overlay strong{display:block;font-size:20px;margin-top:4px}
    .chip-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:22px}
    .chip,.badge{display:inline-flex;align-items:center;border-radius:999px;padding:6px 11px;background:#edf4ff;color:var(--blue);font-size:12px;font-weight:700}
    .badge.orange{background:#fff2e8;color:#c96b2e}
    .entry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .entry{padding:22px 20px;border:1px solid var(--line);border-radius:15px;background:#fff;transition:.25s}
    .entry:hover,.topic:hover,.scene:hover,.resource:hover{transform:translateY(-4px);box-shadow:var(--soft-shadow);border-color:#b9d1f8}
    .entry-num{font-size:13px;color:var(--blue);font-weight:800;margin-bottom:22px}
    .entry p,.topic p,.scene p,.resource p{font-size:14px;color:var(--muted);margin:0}
    .topic-layout{display:grid;grid-template-columns:1.25fr .75fr;gap:18px}
    .topic{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:28px;min-height:190px;transition:.25s}
    .topic.featured{grid-row:span 2;min-height:398px;display:flex;flex-direction:column;justify-content:flex-end;color:#fff;position:relative;overflow:hidden;background:linear-gradient(180deg,rgba(15,45,98,.04),rgba(16,42,87,.8)),url('/assets/images/7233231499642510.jpg') center/cover}
    .topic.featured p{color:#e8f1ff}.topic.featured h3{font-size:27px}.topic.featured .badge{background:rgba(255,255,255,.18);color:#fff}
    .topic-stack{display:grid;gap:18px}
    .service-strip{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:20px;overflow:hidden;background:#fff;box-shadow:var(--soft-shadow)}
    .service-step{padding:28px 24px;border-right:1px solid var(--line);position:relative}
    .service-step:last-child{border-right:0}
    .step-icon{width:38px;height:38px;border-radius:12px;background:var(--sky);color:var(--blue);display:grid;place-items:center;font-weight:800;margin-bottom:21px}
    .service-step p{color:var(--muted);font-size:14px;margin:0}
    .data-band{display:grid;grid-template-columns:repeat(4,1fr);background:#173b82;color:#fff;border-radius:22px;padding:34px 30px;gap:20px;box-shadow:var(--shadow)}
    .data-item{border-right:1px solid rgba(255,255,255,.2);padding-right:20px}
    .data-item:last-child{border-right:0}
    .data-item strong{display:block;font-size:25px;margin-bottom:3px}
    .data-item span{color:#c9d8f1;font-size:13px}
    .timeline{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
    .timeline:before{content:"";position:absolute;top:20px;left:8%;right:8%;height:1px;background:#cbdcf4}
    .timeline-item{position:relative;background:#fff;padding-top:50px}
    .timeline-dot{position:absolute;top:10px;left:0;width:21px;height:21px;border:5px solid #dceaff;background:var(--blue);border-radius:50%;z-index:1}
    .timeline-item p{color:var(--muted);font-size:14px;margin:0}
    .wall{display:grid;grid-template-columns:1.25fr .75fr .75fr;grid-template-rows:190px 190px;gap:16px}
    .wall-card{position:relative;overflow:hidden;border-radius:17px;min-width:0;background:#dce9fa}
    .wall-card:first-child{grid-row:span 2}
    .wall-card img{height:100%;transition:.4s}
    .wall-card:hover img{transform:scale(1.04)}
    .wall-card:after{content:"";position:absolute;inset:35% 0 0;background:linear-gradient(transparent,rgba(9,30,67,.8))}
    .wall-caption{position:absolute;z-index:2;bottom:17px;left:18px;right:18px;color:#fff}
    .wall-caption h3{font-size:17px;margin:7px 0 0}
    .scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .scene{padding:25px;border:1px solid var(--line);border-radius:17px;background:#fff;transition:.25s}
    .scene-icon{font-size:24px;color:var(--blue);margin-bottom:18px}
    .news-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:40px;align-items:start}
    .news-feature{padding:30px;border-radius:20px;background:var(--sky);min-height:245px}
    .news-list{border-top:1px solid var(--line)}
    .news-item{display:flex;gap:24px;padding:20px 0;border-bottom:1px solid var(--line)}
    .news-date{min-width:74px;color:var(--blue);font-size:13px;font-weight:800}
    .news-item h3{font-size:16px;margin-bottom:4px}
    .news-item p{color:var(--muted);font-size:14px;margin:0}
    .resource-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .resource{border:1px solid var(--line);border-radius:15px;background:#fff;padding:23px;transition:.25s}
    .resource strong{display:block;margin-bottom:8px;color:var(--blue)}
    .faq-wrap{display:grid;grid-template-columns:.72fr 1.28fr;gap:65px;align-items:start}
    .faq-list{border-top:1px solid var(--line)}
    details{border-bottom:1px solid var(--line);padding:20px 0}
    summary{cursor:pointer;font-weight:800;list-style:none;padding-right:30px;position:relative}
    summary::-webkit-details-marker{display:none}
    summary:after{content:"+";position:absolute;right:0;color:var(--blue);font-size:22px;font-weight:400}
    details[open] summary:after{content:"−"}
    details p{color:var(--muted);font-size:14px;margin:13px 0 0;max-width:650px}
    .assure{background:#edf6ff;border-top:1px solid #d8eaff;border-bottom:1px solid #d8eaff;padding:28px 0}
    .assure-inner{display:flex;align-items:center;justify-content:space-between;gap:30px}
    .assure-list{display:flex;gap:28px;flex-wrap:wrap;color:#435674;font-size:14px;font-weight:700}
    .assure-list span:before{content:"✓";color:#22a276;margin-right:8px}
    .contact-box{display:grid;grid-template-columns:.9fr 1.1fr;gap:55px;align-items:start}
    .contact-form{background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px;box-shadow:var(--soft-shadow)}
    .field{margin-bottom:15px}
    .field label{display:block;font-size:13px;font-weight:700;margin-bottom:7px}
    .field input,.field textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:12px 13px;outline:0;color:var(--ink);background:#fbfdff}
    .field textarea{min-height:100px;resize:vertical}
    .field input:focus,.field textarea:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(37,99,235,.1)}
    .site-footer{background:#f5f8fd;border-top:1px solid var(--line);padding:54px 0 25px}
    .footer-top{display:flex;justify-content:space-between;gap:40px;padding-bottom:36px}
    .footer-brand{max-width:330px;color:var(--muted);font-size:14px}
    .footer-links{display:flex;gap:25px;flex-wrap:wrap;align-items:flex-start}
    .footer-links a{font-size:14px;color:#53627b}
    .footer-links a:hover{color:var(--blue)}
    .footer-bottom{border-top:1px solid var(--line);padding-top:19px;display:flex;justify-content:space-between;gap:20px;color:#8793a7;font-size:12px}
    .mobile-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:10px;padding:8px 11px;color:var(--blue)}
    @media(max-width:900px){
      .nav-links{display:none}.nav-search{display:none}.mobile-toggle{display:block}
      .hero-layout,.news-layout,.faq-wrap,.contact-box{grid-template-columns:1fr;gap:35px}
      .hero-visual{min-height:340px}.hero-image{height:340px}
      .entry-grid,.scene-grid,.resource-grid{grid-template-columns:repeat(2,1fr)}
      .service-strip,.timeline{grid-template-columns:repeat(2,1fr)}
      .service-step:nth-child(2){border-right:0}.service-step:nth-child(-n+2){border-bottom:1px solid var(--line)}
      .timeline:before{display:none}.wall{grid-template-columns:1fr 1fr;grid-template-rows:220px 160px}.wall-card:first-child{grid-row:span 1;grid-column:span 2}
      .topic-layout{grid-template-columns:1fr}.topic.featured{min-height:300px}.topic-stack{grid-template-columns:1fr 1fr}
      .assure-inner{align-items:flex-start;flex-direction:column}
    }
    @media(max-width:560px){
      .container{width:min(100% - 28px,1180px)}.section{padding:68px 0}.nav-wrap{height:68px}
      h1{font-size:37px}.hero{padding:54px 0 65px}.hero-copy p{font-size:15px}
      .entry-grid,.scene-grid,.resource-grid,.service-strip,.timeline{grid-template-columns:1fr}
      .service-step{border-right:0!important;border-bottom:1px solid var(--line)!important}.service-step:last-child{border-bottom:0!important}
      .topic-stack{grid-template-columns:1fr}.data-band{grid-template-columns:1fr 1fr;padding:24px 20px}.data-item{border-right:0;padding:0}
      .wall{display:flex;flex-direction:column}.wall-card,.wall-card:first-child{height:210px;flex:none}
      .footer-top,.footer-bottom{flex-direction:column}.footer-links{gap:15px}.contact-form{padding:20px}
    }