/* roulang page: index */
:root{--ink:#171a18;--ink-soft:#222724;--paper:#f3f5f2;--white:#fff;--lime:#b6ed45;--cyan:#8ee4d1;--text:#202522;--muted:#69716b;--line:#dce1dc;--line-dark:#373e39;--radius:6px;--shadow:0 8px 24px rgba(20,28,22,.08);--max:1240px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--paper);color:var(--text);font-family:Inter,"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.65}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
img{display:block;max-width:100%}
.container{width:min(var(--max),calc(100% - 48px));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(23,26,24,.97);border-bottom:1px solid #303733;color:#f5f7f3}
.nav-shell{height:74px;display:flex;align-items:center;gap:30px}
.brand{display:flex;align-items:center;gap:12px;min-width:max-content}
.brand-mark{display:grid;place-items:center;width:38px;height:38px;background:var(--lime);color:var(--ink);font-size:16px;font-weight:900;border-radius:5px}
.brand-name{font-size:15px;font-weight:750;line-height:1.2}
.brand-sub{display:block;margin-top:4px;color:#aeb8b0;font-size:10px;font-weight:500}
.main-nav{display:flex;align-items:center;gap:27px;margin-left:auto}
.main-nav a{padding:9px 0;color:#c3cbc4;font-size:13px;transition:color .18s}
.main-nav a:hover,.main-nav a:focus-visible,.main-nav a[aria-current="page"]{color:var(--lime)}
.nav-action{display:inline-flex;align-items:center;justify-content:center;background:var(--lime);color:var(--ink);padding:10px 15px;border-radius:4px;font-size:12px;font-weight:800;transition:transform .18s,background .18s}
.nav-action:hover{transform:translateY(-1px);background:#c6f56a}
.menu-toggle{display:none;margin-left:auto;background:none;border:1px solid #48504a;border-radius:4px;color:white;padding:8px 11px}
.hero{position:relative;overflow:hidden;background:#171a18;color:white}
.hero::before{position:absolute;inset:0;content:"";background:linear-gradient(90deg,rgba(16,20,18,.95) 0%,rgba(16,20,18,.82) 52%,rgba(16,20,18,.26) 100%),url("https://images.unsplash.com/photo-1500375592092-40eb2168fd21?auto=format&fit=crop&w=2000&q=88") center 52%/cover no-repeat}
.hero-inner{position:relative;min-height:440px;display:flex;align-items:center;padding-top:50px;padding-bottom:52px}
.hero-copy{max-width:780px}
.hero-kicker{display:inline-flex;align-items:center;gap:9px;margin-bottom:20px;color:var(--lime);font-size:11px;font-weight:800;text-transform:uppercase}
.hero-kicker::before{content:"";width:22px;height:2px;background:var(--lime)}
.hero h1{max-width:760px;margin:0;font-size:clamp(36px,5vw,62px);line-height:1.14;font-weight:850}
.hero h1 span{color:var(--lime)}
.hero-subtitle{margin:17px 0 10px;color:#dce4dd;font-size:17px;font-weight:650}
.hero-description{max-width:680px;margin:0;color:#c0c9c1;font-size:14px;line-height:1.9}
.hero-actions{display:flex;gap:11px;margin-top:25px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:43px;padding:10px 17px;border-radius:4px;font-size:13px;font-weight:750;transition:transform .18s,background .18s,border-color .18s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--lime);color:var(--ink);border:1px solid var(--lime)}
.btn-primary:hover{background:#c8f679}
.btn-outline{border:1px solid #a6b0a7;color:#f4f7f3;background:rgba(20,24,21,.35)}
.btn-outline:hover{border-color:var(--lime);color:var(--lime)}
:focus-visible{outline:3px solid #28a98c;outline-offset:3px}
.section{padding:76px 0}
.section-tight{padding:58px 0}
.section-dark{background:var(--ink);color:#f5f7f3}
.section-white{background:#fff}
.section-line{border-top:1px solid var(--line)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:30px}
.section-label{display:block;margin-bottom:8px;color:#78817a;font-size:10px;font-weight:800;letter-spacing:1.2px}
.section-dark .section-label{color:#b6ed45}
.section-title{margin:0;font-size:clamp(23px,3vw,34px);line-height:1.25;font-weight:820}
.section-intro{max-width:660px;margin:10px 0 0;color:var(--muted);font-size:13px;line-height:1.8}
.section-dark .section-intro{color:#b6c0b7}
.section-link{flex:none;color:#4c6040;font-size:12px;font-weight:750}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);background:#fff}
.metric{padding:22px 24px;border-right:1px solid var(--line)}
.metric:last-child{border:0}
.metric-value{display:block;color:var(--ink);font-size:28px;font-weight:850;line-height:1.1}
.metric-name{display:block;margin-top:8px;font-size:12px;font-weight:750}
.metric-note{display:block;margin-top:3px;color:var(--muted);font-size:10px}
.poster-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:18px}
.poster{min-width:0}
.poster-image{position:relative;overflow:hidden;aspect-ratio:2/3;background:#d8ddd8;border-radius:var(--radius)}
.poster-image img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
.poster:hover .poster-image img{transform:scale(1.035)}
.poster-badge{position:absolute;top:9px;left:9px;padding:4px 7px;border-radius:3px;background:var(--lime);color:var(--ink);font-size:9px;font-weight:850}
.poster-rating{position:absolute;right:8px;bottom:8px;padding:4px 7px;border-radius:3px;background:rgba(23,26,24,.86);color:white;font-size:9px;font-weight:700}
.poster-title{margin:10px 0 2px;font-size:13px;font-weight:780}
.poster-meta{color:var(--muted);font-size:10px}
.note-line{margin:18px 0 0;color:#838b84;font-size:10px}
.popular-list{display:grid;grid-template-columns:repeat(2,1fr);gap:0 40px;border-top:1px solid var(--line-dark)}
.popular-item{display:grid;grid-template-columns:48px 1fr auto;align-items:center;gap:14px;padding:18px 0;border-bottom:1px solid var(--line-dark)}
.popular-no{color:var(--lime);font-size:18px;font-weight:850}
.popular-name{margin:0;font-size:14px;font-weight:750}
.popular-desc{margin:3px 0 0;color:#aeb8b0;font-size:11px}
.tag{display:inline-flex;align-items:center;min-height:23px;padding:3px 8px;border:1px solid #59625b;border-radius:3px;color:#d5ddd6;font-size:9px;font-weight:750}
.topic-grid{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.topic{padding:22px 18px 24px 0;border-right:1px solid var(--line);margin-right:18px}
.topic:last-child{border-right:0;margin-right:0}
.topic-no{color:#88928a;font-size:10px;font-weight:800}
.topic h3{margin:13px 0 8px;font-size:15px;font-weight:800}
.topic p{margin:0;color:var(--muted);font-size:11px;line-height:1.8}
.service-band{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark)}
.service{padding:22px 20px 22px 0}
.service + .service{padding-left:20px;border-left:1px solid var(--line-dark)}
.service-index{color:var(--lime);font-size:10px;font-weight:850}
.service h3{margin:9px 0 5px;font-size:14px}
.service p{margin:0;color:#b5beb6;font-size:11px;line-height:1.75}
.compare-wrap{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);background:#fff}
.compare-col{padding:24px 28px}
.compare-col + .compare-col{border-left:1px solid var(--line)}
.compare-title{display:flex;align-items:center;gap:9px;margin:0 0 17px;font-size:14px;font-weight:800}
.compare-title span{width:8px;height:8px;border-radius:50%;background:#adb5ad}
.compare-col:last-child .compare-title span{background:#78bd3a}
.compare-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}
.compare-list li{display:flex;justify-content:space-between;gap:18px;padding-bottom:10px;border-bottom:1px solid #edf0ed;font-size:11px}
.compare-list li span:last-child{color:var(--muted);text-align:right}
.rank-table{width:100%;border-collapse:collapse;text-align:left}
.rank-table th{padding:12px 16px;background:#e8ece8;color:#68716a;font-size:10px;font-weight:800}
.rank-table td{padding:13px 16px;border-bottom:1px solid var(--line);font-size:12px}
.rank-table tbody tr:hover{background:#fff}
.rank-no{color:#67716a;font-weight:850}
.rank-no.top{color:#679c24}
.rank-title{font-weight:760}
.rank-category{color:var(--muted)}
.rank-score{font-weight:750}
.timeline{display:grid;grid-template-columns:repeat(4,1fr);position:relative}
.timeline::before{position:absolute;top:8px;left:0;right:0;height:1px;background:#465049;content:""}
.milestone{position:relative;padding:28px 25px 0 0}
.milestone::before{position:absolute;top:3px;left:0;width:10px;height:10px;border-radius:50%;background:var(--lime);border:2px solid var(--ink);content:""}
.milestone-date{color:var(--lime);font-size:10px;font-weight:800}
.milestone h3{margin:9px 0 6px;font-size:14px}
.milestone p{margin:0;color:#b2bcb4;font-size:11px;line-height:1.75}
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 28px}
.news-item{display:grid;grid-template-columns:126px 1fr;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.news-item img{width:126px;height:84px;object-fit:cover;border-radius:4px}
.news-date{color:#818a82;font-size:10px}
.news-title{margin:4px 0 5px;font-size:13px;font-weight:800;line-height:1.5}
.news-desc{margin:0;color:var(--muted);font-size:10px;line-height:1.7}
.assurance-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.assurance{padding-top:16px;border-top:2px solid #404842}
.assurance-icon{display:grid;place-items:center;width:34px;height:34px;margin-bottom:12px;border:1px solid #566057;border-radius:4px;color:var(--lime);font-size:13px;font-weight:900}
.assurance h3{margin:0 0 7px;font-size:14px}
.assurance p{margin:0;color:#b5beb6;font-size:11px;line-height:1.75}
.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0 26px}
.quick{padding:18px 18px 18px 0;border-bottom:1px solid var(--line)}
.quick:nth-child(3n+2),.quick:nth-child(3n+3){padding-left:18px;border-left:1px solid var(--line)}
.quick h3{margin:0 0 7px;font-size:13px}
.quick p{margin:0;color:var(--muted);font-size:11px;line-height:1.75}
.faq-list{border-top:1px solid var(--line-dark)}
.faq-item{border-bottom:1px solid var(--line-dark)}
.faq-item summary{position:relative;padding:17px 35px 17px 0;cursor:pointer;list-style:none;font-size:13px;font-weight:750}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{position:absolute;right:2px;top:13px;content:"+";color:var(--lime);font-size:21px;font-weight:400}
.faq-item[open] summary::after{content:"−"}
.faq-item p{max-width:900px;margin:0;padding:0 28px 18px 0;color:#b8c1b9;font-size:12px;line-height:1.8}
.feedback-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:70px}
.feedback-copy h2{margin:0;font-size:30px;line-height:1.3}
.feedback-copy p{margin:13px 0 0;color:#bac3bb;font-size:12px;line-height:1.8}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{display:grid;gap:6px}
.field-full{grid-column:1/-1}
.field label{font-size:11px;font-weight:750}
.field input,.field select,.field textarea{width:100%;border:1px solid #4c554e;border-radius:4px;background:#202521;color:#f5f7f3;padding:10px 11px;font-size:12px}
.field input::placeholder,.field textarea::placeholder{color:#8e9990}
.field textarea{min-height:92px;resize:vertical}
.form-foot{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:13px}
.consent{display:flex;align-items:flex-start;gap:8px;color:#b6c0b7;font-size:10px;line-height:1.6}
.consent input{margin-top:3px;accent-color:var(--lime)}
.feedback-status{min-height:22px;margin-top:9px;color:var(--lime);font-size:11px}
.site-footer{background:#111412;color:#edf1ed}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding:42px 0 34px}
.footer-brand{font-size:15px;font-weight:800}
.footer-copy{max-width:290px;margin:10px 0 0;color:#a7b0a8;font-size:11px;line-height:1.8}
.footer-col h3{margin:0 0 12px;font-size:11px;color:#fff}
.footer-col a,.footer-col p{display:block;margin:7px 0;color:#aab3ab;font-size:10px}
.footer-col a:hover{color:var(--lime)}
.copyright{display:flex;justify-content:space-between;gap:20px;padding:15px 0;border-top:1px solid #333a34;color:#939d94;font-size:10px}
@media(max-width:1024px){
 .main-nav{gap:16px}.main-nav a{font-size:12px}
 .poster-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
 .topic-grid{grid-template-columns:repeat(3,1fr)}
 .topic:nth-child(3){border-right:0;margin-right:0}
 .topic:nth-child(n+4){border-top:1px solid var(--line)}
 .footer-grid{grid-template-columns:1.3fr 1fr 1fr}
}
@media(max-width:768px){
 .container{width:min(var(--max),calc(100% - 34px))}
 .nav-shell{height:66px;gap:14px}
 .brand-name{font-size:13px}
 .menu-toggle{display:block}
 .nav-action{display:none}
 .main-nav{display:none;position:absolute;top:66px;left:0;right:0;margin:0;padding:10px 17px 16px;background:#171a18;border-bottom:1px solid #303733;flex-direction:column;align-items:stretch;gap:0}
 .main-nav.is-open{display:flex}
 .main-nav a{padding:11px 2px;border-bottom:1px solid #303733;font-size:13px}
 .hero-inner{min-height:400px;padding-top:44px;padding-bottom:42px}
 .hero h1{font-size:42px}
 .section{padding:58px 0}.section-tight{padding:46px 0}
 .section-head{align-items:flex-start;flex-direction:column;gap:10px}
 .metrics{grid-template-columns:repeat(2,1fr)}
 .metric:nth-child(2){border-right:0}
 .metric:nth-child(n+3){border-top:1px solid var(--line)}
 .poster-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px 12px}
 .topic-grid{grid-template-columns:repeat(2,1fr)}
 .topic,.topic:nth-child(3){padding:18px 12px 20px 0;margin-right:12px;border-right:1px solid var(--line)}
 .topic:nth-child(2n){padding-left:12px;padding-right:0;margin-right:0;border-right:0}
 .topic:nth-child(n+3){border-top:1px solid var(--line)}
 .service-band{grid-template-columns:repeat(2,1fr)}
 .service:nth-child(3){padding-left:0;border-left:0}
 .service:nth-child(n+3){border-top:1px solid var(--line-dark)}
 .compare-col{padding:19px 17px}
 .rank-table th,.rank-table td{padding:11px 9px}
 .rank-category{font-size:10px}
 .timeline{grid-template-columns:repeat(2,1fr);row-gap:24px}
 .timeline::before{display:none}
 .milestone{padding-top:0}
 .milestone::before{top:4px}
 .news-grid{grid-template-columns:1fr}
 .assurance-grid{grid-template-columns:repeat(2,1fr);gap:24px}
 .quick-grid{grid-template-columns:repeat(2,1fr)}
 .quick:nth-child(3n+2),.quick:nth-child(3n+3){padding-left:0;border-left:0}
 .quick:nth-child(even){padding-left:15px;border-left:1px solid var(--line)}
 .feedback-layout{grid-template-columns:1fr;gap:24px}
 .footer-grid{grid-template-columns:repeat(2,1fr);gap:26px}
}
@media(max-width:520px){
 .container{width:calc(100% - 30px)}
 .brand-mark{width:34px;height:34px}
 .brand-name{max-width:225px;font-size:12px}
 .hero::before{background:linear-gradient(90deg,rgba(16,20,18,.94),rgba(16,20,18,.68)),url("https://images.unsplash.com/photo-1500375592092-40eb2168fd21?auto=format&fit=crop&w=1000&q=82") center/cover no-repeat}
 .hero-inner{min-height:390px}
 .hero h1{font-size:36px}
 .hero-subtitle{font-size:15px}
 .hero-description{font-size:12px}
 .hero-actions{flex-wrap:wrap}
 .btn{min-height:41px;padding:9px 13px;font-size:12px}
 .metric{padding:18px 15px}
 .metric-value{font-size:24px}
 .poster-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 12px}
 .poster-title{font-size:12px}
 .popular-list{grid-template-columns:1fr}
 .popular-item{grid-template-columns:38px 1fr auto}
 .topic-grid{grid-template-columns:1fr}
 .topic,.topic:nth-child(3),.topic:nth-child(2n){padding:16px 0;margin:0;border-right:0;border-top:1px solid var(--line)}
 .topic:first-child{border-top:0}
 .compare-wrap{grid-template-columns:1fr}
 .compare-col + .compare-col{border-left:0;border-top:1px solid var(--line)}
 .rank-table th{font-size:9px}
 .rank-table td{padding:10px 6px;font-size:10px}
 .rank-category{display:none}
 .rank-table th:nth-child(3),.rank-table td:nth-child(3){display:none}
 .timeline{grid-template-columns:1fr}
 .milestone{padding:0 0 0 19px}
 .milestone::before{left:0}
 .news-item{grid-template-columns:96px 1fr;gap:12px}
 .news-item img{width:96px;height:72px}
 .assurance-grid{gap:20px 15px}
 .quick-grid{grid-template-columns:1fr}
 .quick,.quick:nth-child(even){padding:15px 0;border-left:0}
 .form-grid{grid-template-columns:1fr}
 .field-full{grid-column:auto}
 .form-foot{align-items:flex-start;flex-direction:column}
 .footer-grid{grid-template-columns:1fr 1fr;gap:22px 16px}
 .footer-grid > div:first-child{grid-column:1/-1}
 .copyright{flex-direction:column;gap:5px}
}