/* roulang page: index */
:root{--bg:#141916;--bg-soft:#1c231f;--bg-card:#202923;--bg-light:#e9eee6;--ink:#f4f5ee;--ink-dark:#18211b;--muted:#aab4a8;--muted-dark:#58645a;--line:#354139;--line-light:#d3dbd1;--accent:#8bd6a5;--accent-dark:#183d2c;--coral:#ff946f;--white:#fffdf8;--radius:7px;--shadow:0 12px 28px rgba(0,0,0,.18);--container:1180px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif}
a{color:inherit;text-decoration:none}
button{font:inherit}
img{display:block;max-width:100%}
.container{width:min(var(--container),calc(100% - 48px));margin-inline:auto}
.skip-link{position:absolute;left:-9999px;top:8px;z-index:100;background:var(--accent);color:var(--ink-dark);padding:10px 14px}
.skip-link:focus{left:8px}
.site-header{position:sticky;top:0;z-index:20;background:rgba(20,25,22,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.nav-wrap{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.brand{display:flex;align-items:center;gap:11px;font-size:16px;font-weight:750;white-space:nowrap}
.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:6px;background:var(--accent);color:var(--accent-dark);font-weight:900;font-size:19px}
.nav-links{display:flex;align-items:center;gap:25px}
.nav-links a{font-size:14px;color:#d5ddd5;transition:color .18s ease}
.nav-links a:hover,.nav-links a:focus-visible,.nav-links a[aria-current="page"]{color:var(--accent)}
.nav-action{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 17px;background:var(--accent);color:var(--accent-dark);border-radius:5px;font-size:14px;font-weight:750;transition:background .18s ease,transform .18s ease}
.nav-action:hover,.button-primary:hover{background:#a6e5b7;transform:translateY(-1px)}
.menu-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:5px;background:transparent;color:var(--ink);cursor:pointer}
.menu-toggle:focus-visible,.button:focus-visible,.nav-links a:focus-visible,.nav-action:focus-visible,summary:focus-visible{outline:3px solid var(--coral);outline-offset:3px}
.hero{position:relative;min-height:575px;display:flex;align-items:flex-end;overflow:hidden;background:#26352d}
.hero-image{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 42%;opacity:.73}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(13,20,16,.88) 0%,rgba(13,20,16,.53) 48%,rgba(13,20,16,.05) 100%),linear-gradient(0deg,rgba(13,20,16,.66),transparent 58%)}
.hero-inner{position:relative;z-index:1;padding:74px 0 68px}
.hero-kicker,.eyebrow{color:var(--accent);font-size:12px;letter-spacing:1.2px;font-weight:750;text-transform:uppercase}
.hero h1{max-width:680px;margin:13px 0 10px;font-size:54px;line-height:1.12;font-weight:800}
.hero h1 span{color:var(--accent)}
.hero-subtitle{margin:0 0 16px;color:#e9eee7;font-size:19px}
.hero-copy{max-width:630px;margin:0;color:#d3dbd3;font-size:15px}
.hero-actions{display:flex;gap:12px;margin-top:27px}
.button{min-height:46px;padding:0 19px;display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:5px;font-weight:700;font-size:14px;transition:background .18s ease,border-color .18s ease,transform .18s ease}
.button-primary{background:var(--accent);color:var(--accent-dark)}
.button-secondary{border-color:#b8c4b9;color:var(--white);background:rgba(20,25,22,.28)}
.button-secondary:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}
.section{padding:72px 0;border-bottom:1px solid var(--line)}
.section-light{background:var(--bg-light);color:var(--ink-dark);border-color:var(--line-light)}
.section-soft{background:var(--bg-soft)}
.section-head{max-width:720px;margin-bottom:30px}
.section-head h2{margin:6px 0 10px;font-size:30px;line-height:1.25}
.section-head p{margin:0;color:var(--muted);font-size:15px}
.section-light .section-head p{color:var(--muted-dark)}
.eyebrow{font-size:11px;letter-spacing:1px}
.problem-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line)}
.problem-item{padding:22px 23px 18px 0;border-bottom:1px solid var(--line)}
.problem-item:not(:first-child){padding-left:23px;border-left:1px solid var(--line)}
.problem-item h3{margin:0 0 7px;font-size:17px}
.problem-item p{margin:0;color:var(--muted);font-size:14px}
.solution-row{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.solution-item{padding-top:14px;border-top:3px solid var(--accent)}
.solution-item .step-label{color:#a0b8a4;font-size:12px;font-weight:750}
.solution-item h3{margin:8px 0;font-size:18px}
.solution-item p{margin:0;color:var(--muted);font-size:14px}
.method-list{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:method}
.method-item{counter-increment:method;padding:19px 17px;border:1px solid var(--line-light);border-radius:5px}
.method-item::before{content:"0" counter(method);display:block;color:#447255;font-size:13px;font-weight:800}
.method-item h3{margin:9px 0 6px;font-size:16px}
.method-item p{margin:0;color:var(--muted-dark);font-size:13px}
.metric-strip{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.metric{padding:22px 18px 22px 0}
.metric+.metric{padding-left:22px;border-left:1px solid var(--line)}
.metric strong{display:block;color:var(--accent);font-size:26px;line-height:1.15}
.metric span{display:block;margin-top:7px;color:var(--muted);font-size:13px}
.metric-note{margin:14px 0 0;color:var(--muted);font-size:12px}
.experience-band{display:grid;grid-template-columns:1.15fr 2fr;gap:40px;align-items:start}
.experience-band h2{margin:0;font-size:27px;line-height:1.3}
.experience-band p{margin:10px 0 0;color:var(--muted);font-size:14px}
.experience-list{display:grid;grid-template-columns:repeat(2,1fr);gap:0 24px}
.experience-list div{padding:14px 0;border-bottom:1px solid var(--line)}
.experience-list strong{display:block;font-size:15px}
.experience-list span{display:block;color:var(--muted);font-size:13px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tag{display:inline-flex;align-items:center;min-height:29px;padding:3px 9px;border:1px solid var(--line);border-radius:4px;color:#d1dbd1;font-size:12px}
.section-light .tag{border-color:var(--line-light);color:#47594b}
.poster-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:23px 16px}
.poster-card{min-width:0}
.poster-link{display:block;overflow:hidden;border-radius:5px;background:#29332c}
.poster-image{width:100%;aspect-ratio:2/3;object-fit:cover;transition:transform .3s ease,filter .3s ease}
.poster-link:hover .poster-image{transform:scale(1.035);filter:brightness(1.08)}
.poster-meta{display:flex;justify-content:space-between;gap:5px;margin-top:10px}
.badge{display:inline-flex;align-items:center;padding:3px 7px;border-radius:3px;background:#283d30;color:#b4e4bd;font-size:10px;line-height:1.4}
.badge-blue{background:#293c3a;color:#b5dcd0}
.rating{color:#ffd09a;font-size:12px;font-weight:700;white-space:nowrap}
.poster-card h3{margin:7px 0 0;font-size:14px;line-height:1.4;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.poster-sub{margin:3px 0 0;color:var(--muted);font-size:12px}
.featured-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.featured-card{display:grid;grid-template-columns:112px 1fr;min-height:178px;overflow:hidden;border:1px solid var(--line);border-radius:5px;background:#1b221e}
.featured-card img{width:112px;height:100%;min-height:178px;object-fit:cover}
.featured-copy{padding:16px 14px}
.featured-copy .tag{margin-bottom:8px}
.featured-copy h3{margin:0 0 6px;font-size:16px}
.featured-copy p{margin:0;color:var(--muted);font-size:13px}
.featured-foot{display:flex;justify-content:space-between;align-items:center;margin-top:12px;color:var(--muted);font-size:12px}
.category-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:0 25px}
.category-item{padding:16px 0;border-top:1px solid var(--line-light)}
.category-item h3{margin:0 0 7px;font-size:17px}
.category-item p{margin:0;color:var(--muted-dark);font-size:13px}
.category-item a{display:inline-block;margin-top:9px;color:#356346;font-size:12px;font-weight:700}
.category-item a:hover{color:#1d4229;text-decoration:underline}
.ranking-columns{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.rank-list{list-style:none;margin:0;padding:0}
.rank-row{display:grid;grid-template-columns:40px minmax(0,1fr) 92px 45px;align-items:center;gap:10px;padding:13px 0;border-bottom:1px solid var(--line)}
.rank-number{color:var(--accent);font-size:17px;font-weight:800}
.rank-name{font-size:14px;font-weight:650}
.rank-type{display:block;color:var(--muted);font-size:11px}
.rank-heat{color:var(--muted);font-size:11px;text-align:right}
.rank-score{color:#ffd09a;font-size:12px;text-align:right;font-weight:700}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.news-item{display:grid;grid-template-columns:90px 1fr;gap:14px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}
.news-thumb{width:90px;aspect-ratio:1.25;object-fit:cover;border-radius:4px}
.news-item time{color:var(--muted);font-size:11px}
.news-item h3{margin:4px 0 0;font-size:14px;line-height:1.45}
.news-item a:hover h3{color:var(--accent)}
.topic-feature{display:grid;grid-template-columns:1.15fr 1fr;min-height:260px;align-items:center;gap:45px}
.topic-art{position:relative;min-height:250px;overflow:hidden;background:#4a5b4b;border-radius:5px}
.topic-art img{position:absolute;width:100%;height:100%;object-fit:cover;opacity:.78}
.topic-art::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(15,22,17,.7),transparent 75%)}
.topic-art span{position:absolute;z-index:1;left:22px;bottom:18px;color:white;font-size:20px;font-weight:750}
.topic-copy h2{margin:0 0 10px;font-size:27px}
.topic-copy p{margin:0;color:var(--muted);font-size:14px}
.topic-links{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}
.topic-links a{padding:8px 11px;border:1px solid var(--line);border-radius:4px;color:#e0e7df;font-size:12px;transition:background .18s ease,border-color .18s ease}
.topic-links a:hover{background:#29382e;border-color:var(--accent)}
.device-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0 28px}
.device-item{padding:18px 0;border-top:1px solid var(--line)}
.device-icon{display:grid;place-items:center;width:38px;height:38px;border:1px solid #526056;border-radius:5px;color:var(--accent);font-size:18px}
.device-item h3{margin:10px 0 5px;font-size:16px}
.device-item p{margin:0;color:var(--muted);font-size:13px}
.update-layout{display:grid;grid-template-columns:1fr 1fr;gap:44px}
.update-day h3{margin:0 0 10px;color:#447255;font-size:15px}
.update-row{display:flex;justify-content:space-between;gap:18px;padding:12px 0;border-bottom:1px solid var(--line-light);font-size:13px}
.update-row span:last-child{color:var(--muted-dark);white-space:nowrap}
.faq-list{max-width:850px}
.faq-item{border-top:1px solid var(--line)}
.faq-item:last-child{border-bottom:1px solid var(--line)}
.faq-item summary{position:relative;list-style:none;padding:17px 35px 17px 0;cursor:pointer;font-weight:700}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:4px;top:12px;color:var(--accent);font-size:23px}
.faq-item[open] summary::after{content:"−"}
.faq-item p{margin:0;padding:0 30px 18px 0;color:var(--muted);font-size:14px}
.index-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}
.index-block{padding-top:14px;border-top:2px solid var(--accent)}
.index-block strong{display:block;font-size:17px}
.index-block span{display:block;margin-top:5px;color:var(--muted);font-size:13px}
.cta-section{padding:58px 0;background:#24382b}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px}
.cta-inner h2{margin:0;font-size:27px}
.cta-inner p{margin:7px 0 0;color:#c5d3c8;font-size:14px}
.site-footer{padding:46px 0 0;background:#101512}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:35px;padding-bottom:35px}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:750}
.footer-about p{max-width:270px;margin:12px 0 0;color:var(--muted);font-size:13px}
.footer-col h3{margin:0 0 12px;font-size:14px}
.footer-col a{display:block;width:fit-content;margin:7px 0;color:var(--muted);font-size:13px}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{padding:15px 0;border-top:1px solid var(--line);color:#859187;font-size:12px}
@media(max-width:1023px){
 .nav-links{gap:15px}.nav-links a{font-size:13px}.nav-action{display:none}
 .hero{min-height:520px}.poster-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
 .featured-grid{grid-template-columns:repeat(2,1fr)}.category-grid{grid-template-columns:repeat(3,1fr)}
 .news-grid{grid-template-columns:repeat(2,1fr)}.experience-band{grid-template-columns:1fr;gap:22px}
}
@media(max-width:767px){
 .container{width:min(100% - 36px,var(--container))}
 .nav-wrap{min-height:66px}.brand{font-size:14px}.brand-mark{width:35px;height:35px}
 .menu-toggle{display:block}.nav-links{display:none;position:absolute;left:0;right:0;top:65px;padding:12px 18px 18px;background:#171e19;border-bottom:1px solid var(--line);align-items:stretch;gap:0}
 .nav-links.is-open{display:flex;flex-direction:column}.nav-links a{padding:12px 4px;border-bottom:1px solid var(--line);font-size:15px}
 .hero{min-height:530px}.hero-image{object-position:58% center;opacity:.55}.hero::after{background:linear-gradient(90deg,rgba(13,20,16,.83),rgba(13,20,16,.35)),linear-gradient(0deg,rgba(13,20,16,.72),transparent 70%)}
 .hero-inner{padding:66px 0 48px}.hero h1{max-width:500px;font-size:42px}.hero-subtitle{font-size:17px}.hero-copy{font-size:14px}
 .section{padding:54px 0}.section-head h2{font-size:25px}.problem-grid{grid-template-columns:1fr}
 .problem-item,.problem-item:not(:first-child){padding:16px 0;border-left:0}
 .solution-row{grid-template-columns:1fr;gap:20px}.method-list{grid-template-columns:repeat(2,1fr);gap:12px}
 .metric-strip{grid-template-columns:repeat(2,1fr)}.metric{padding:18px 10px 18px 0}.metric:nth-child(3){padding-left:0;border-left:0;border-top:1px solid var(--line)}
 .metric:nth-child(4){border-top:1px solid var(--line)}
 .experience-list{grid-template-columns:1fr 1fr;gap:0 15px}
 .poster-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 13px}
 .featured-grid{grid-template-columns:1fr 1fr;gap:12px}.featured-card{grid-template-columns:82px 1fr;min-height:145px}
 .featured-card img{width:82px;min-height:145px}.featured-copy{padding:11px 9px}.featured-copy p{display:none}.featured-copy h3{font-size:14px}.featured-foot{margin-top:10px;font-size:11px}
 .category-grid{grid-template-columns:repeat(2,1fr);gap:0 16px}
 .ranking-columns{grid-template-columns:1fr;gap:0}.rank-row{grid-template-columns:34px minmax(0,1fr) 79px 40px}
 .news-grid{grid-template-columns:1fr;gap:0}
 .topic-feature{grid-template-columns:1fr;gap:23px}.topic-art{min-height:215px}.topic-copy h2{font-size:24px}
 .device-grid{grid-template-columns:1fr 1fr;gap:0 18px}.update-layout{grid-template-columns:1fr;gap:28px}
 .index-grid{grid-template-columns:repeat(2,1fr);gap:20px}
 .cta-inner{align-items:flex-start;flex-direction:column}.cta-inner h2{font-size:23px}
 .footer-grid{grid-template-columns:1fr 1fr;gap:26px 18px}
}
@media(max-width:420px){
 .hero h1{font-size:36px}.hero-actions{gap:8px}.button{padding:0 13px;font-size:13px}
 .method-item{padding:15px 12px}.featured-card{grid-template-columns:72px 1fr}.featured-card img{width:72px}
 .rank-heat{font-size:10px}.rank-row{grid-template-columns:30px minmax(0,1fr) 68px 37px;gap:7px}
 .footer-grid{gap:24px 12px}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}