/* roulang page: index */
:root{--ink:#17202a;--muted:#68737d;--paper:#f6f7f3;--white:#fff;--line:#dfe5e2;--green:#1e8c68;--lime:#c6ef65;--orange:#f18b4f;--night:#17262b;--radius:18px;--shadow:0 18px 45px rgba(23,38,43,.10)}
    *{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth}
    body{font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);line-height:1.7}
    a{text-decoration:none;color:inherit}
    img{display:block;width:100%;object-fit:cover}
    button{font:inherit;border:0;cursor:pointer}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(246,247,243,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(223,229,226,.8)}
    .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
    .brand{display:flex;align-items:center;gap:11px;font-size:18px;font-weight:800;white-space:nowrap}
    .brand-mark{width:38px;height:38px;background:var(--green);color:var(--lime);display:grid;place-items:center;border-radius:10px;font-weight:900}
    .nav-links{display:flex;align-items:center;gap:25px;color:#58636a;font-size:14px}
    .nav-links a{transition:.25s}
    .nav-links a:hover,.nav-links a.active{color:var(--green)}
    .nav-action{padding:10px 17px;border-radius:10px;background:var(--ink);color:#fff;font-size:14px;transition:.25s}
    .nav-action:hover{background:var(--green);transform:translateY(-2px)}
    .menu-btn{display:none;background:transparent;font-size:24px}
    .hero{position:relative;overflow:hidden;background:var(--night);color:#fff;padding:92px 0 78px;clip-path:polygon(0 0,100% 0,100% 91%,0 100%)}
    .hero:after{content:"";position:absolute;right:-120px;top:-180px;width:520px;height:520px;border:1px solid rgba(198,239,101,.25);border-radius:50%;box-shadow:0 0 0 36px rgba(198,239,101,.04),0 0 0 72px rgba(198,239,101,.03)}
    .hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:70px;align-items:center;position:relative;z-index:1}
    .eyebrow{color:var(--lime);font-size:13px;letter-spacing:2px;margin-bottom:18px}
    h1{font-size:clamp(38px,5vw,68px);line-height:1.1;letter-spacing:0;font-weight:800;max-width:650px}
    h1 span{color:var(--lime)}
    .hero-copy{margin-top:22px;color:#c8d1d0;font-size:17px;max-width:620px}
    .hero-buttons{display:flex;gap:13px;margin-top:31px;flex-wrap:wrap}
    .btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 21px;border-radius:11px;font-weight:700;transition:.25s}
    .btn-primary{background:var(--lime);color:var(--ink)}
    .btn-primary:hover{background:#e0ff91;transform:translateY(-2px)}
    .btn-ghost{border:1px solid rgba(255,255,255,.25);color:#fff}
    .btn-ghost:hover{background:rgba(255,255,255,.1)}
    .survey{background:#f7faf2;color:var(--ink);padding:25px;border-radius:20px;box-shadow:var(--shadow);transform:rotate(2deg)}
    .survey-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}
    .survey-title{font-size:20px;font-weight:800}
    .survey-step{color:var(--green);font-size:13px;font-weight:700}
    .question{font-size:18px;font-weight:700;margin-bottom:16px}
    .choices{display:grid;gap:10px}
    .choice{padding:13px 15px;border:1px solid var(--line);border-radius:10px;background:#fff;display:flex;justify-content:space-between;font-size:14px;transition:.2s}
    .choice:hover{border-color:var(--green);color:var(--green)}
    .choice b{color:#a5b0ab}
    .survey-foot{margin-top:19px;padding-top:17px;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}
    section{padding:78px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:25px;margin-bottom:28px}
    .section-kicker{color:var(--green);font-size:13px;font-weight:800;letter-spacing:1px;margin-bottom:8px}
    h2{font-size:32px;line-height:1.25;letter-spacing:0}
    .section-desc{color:var(--muted);max-width:580px;font-size:15px}
    .text-link{color:var(--green);font-weight:700;font-size:14px;white-space:nowrap}
    .category-band{background:#e9f0e7}
    .category-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
    .category{padding:24px 20px;background:#fff;border:1px solid #dfe8de;border-radius:var(--radius);min-height:170px;transition:.25s}
    .category:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .category-icon{font-size:25px;color:var(--green);margin-bottom:16px}
    .category h3{font-size:18px;margin-bottom:8px}
    .category p{color:var(--muted);font-size:13px;line-height:1.7}
    .content-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
    .content-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s}
    .content-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .card-image{height:205px;position:relative;background:#d9dfda}
    .card-image img{height:100%}
    .badge{position:absolute;left:12px;top:12px;background:var(--lime);color:var(--ink);padding:4px 8px;border-radius:6px;font-size:11px;font-weight:800}
    .card-body{padding:15px 16px}
    .card-body h3{font-size:16px;margin-bottom:6px}
    .meta{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:12px}
    .rating{color:#d57936;font-weight:800}
    .feature-section{background:#fff}
    .feature-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:22px}
    .feature-main{min-height:370px;border-radius:22px;overflow:hidden;position:relative;background:#263b3e}
    .feature-main img{height:100%;opacity:.78}
    .feature-overlay{position:absolute;inset:auto 0 0;padding:30px;color:#fff;background:linear-gradient(transparent,rgba(10,25,28,.9))}
    .feature-overlay h3{font-size:28px;margin:7px 0}
    .feature-side{display:grid;gap:16px}
    .mini-card{display:grid;grid-template-columns:135px 1fr;gap:15px;background:var(--paper);border-radius:15px;overflow:hidden}
    .mini-card img{height:120px}
    .mini-card div{padding:15px 15px 10px 0}
    .mini-card h3{font-size:16px;margin-bottom:8px}
    .mini-card p{font-size:13px;color:var(--muted)}
    .news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .news-item{display:grid;grid-template-columns:125px 1fr;gap:15px;align-items:center;padding:13px;border-bottom:1px solid var(--line)}
    .news-item img{height:90px;border-radius:10px}
    .news-item h3{font-size:15px;line-height:1.45}
    .news-date{font-size:12px;color:var(--muted);display:block;margin-top:6px}
    .ranking-section{background:var(--night);color:#fff}
    .ranking-section .section-desc{color:#aebcba}
    .ranking-list{display:grid;grid-template-columns:repeat(2,1fr);gap:0 50px}
    .rank-item{display:grid;grid-template-columns:40px 1fr auto auto;gap:15px;align-items:center;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.13)}
    .rank-num{font-size:22px;color:var(--lime);font-weight:800}
    .rank-item h3{font-size:15px}
    .rank-item small{color:#99aaa7}
    .heat{color:#f6aa68;font-size:13px}
    .evidence{background:#eef3ed}
    .evidence-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .evidence-card{background:#fff;padding:25px;border-radius:var(--radius);border:1px solid #dfe7df}
    .quote{font-size:17px;line-height:1.8;margin-bottom:20px}
    .quote:before{content:"“";font-size:40px;color:var(--green);line-height:0;vertical-align:-15px;margin-right:5px}
    .profile{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px}
    .profile-dot{width:32px;height:32px;border-radius:50%;background:var(--orange)}
    .partner-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .partner{padding:12px 20px;background:#fff;border:1px solid var(--line);border-radius:10px;color:#5b686c;font-size:14px}
    .trust-strip{padding:34px 0;background:var(--lime)}
    .trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
    .trust strong{display:block;font-size:26px;color:var(--ink)}
    .trust span{font-size:13px;color:#52604d}
    .faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}
    details{background:#fff;border:1px solid var(--line);border-radius:13px;padding:18px 20px}
    summary{font-weight:700;cursor:pointer;list-style:none}
    summary::-webkit-details-marker{display:none}
    details p{color:var(--muted);font-size:14px;padding-top:12px}
    .final-cta{padding:72px 0;background:var(--orange);color:#fff}
    .cta-wrap{display:flex;justify-content:space-between;align-items:center;gap:30px}
    .cta-wrap h2{max-width:650px}
    .cta-wrap p{margin-top:10px;color:#fff2e8}
    .cta-wrap .btn-primary{background:#fff;color:var(--ink)}
    footer{background:#152326;color:#b7c3c0;padding:56px 0 23px}
    .footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:35px;padding-bottom:42px}
    footer .brand{color:#fff;margin-bottom:15px}
    footer h3{color:#fff;font-size:14px;margin-bottom:14px}
    footer a,footer p{display:block;color:#9aa9a6;font-size:13px;margin:8px 0}
    footer a:hover{color:var(--lime)}
    .copyright{border-top:1px solid rgba(255,255,255,.12);padding-top:19px;font-size:12px;color:#7d8e8b}
    @media(max-width:1024px){.hero-grid{gap:35px}.category-grid{grid-template-columns:repeat(3,1fr)}.content-grid{grid-template-columns:repeat(3,1fr)}.footer-grid{grid-template-columns:1.3fr repeat(3,1fr)}}
    @media(max-width:768px){.container{width:min(100% - 30px,620px)}.nav-links,.nav-action{display:none}.menu-btn{display:block}.hero{padding:65px 0 75px;clip-path:polygon(0 0,100% 0,100% 96%,0 100%)}.hero-grid,.feature-grid{grid-template-columns:1fr}.survey{transform:none}.category-grid,.content-grid,.news-grid,.evidence-grid{grid-template-columns:repeat(2,1fr)}.ranking-list{grid-template-columns:1fr}.section-head{display:block}.text-link{display:inline-block;margin-top:13px}.trust-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:520px){section{padding:55px 0}h2{font-size:27px}.hero-copy{font-size:15px}.category-grid,.content-grid,.news-grid,.evidence-grid,.faq-grid{grid-template-columns:1fr}.card-image{height:220px}.mini-card{grid-template-columns:115px 1fr}.mini-card img{height:125px}.cta-wrap{display:block}.cta-wrap .btn{margin-top:22px}.footer-grid{grid-template-columns:1fr}.trust strong{font-size:22px}}
    :focus-visible{outline:3px solid var(--orange);outline-offset:3px}

@media(max-width:768px){
    .nav-links.mobile-open{display:flex;position:absolute;left:15px;right:15px;top:68px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);flex-direction:column;align-items:flex-start;gap:12px}
  }