/* roulang page: index */
:root{
      --ink:#080e18;--ink-2:#0d1623;--ink-3:#121e2b;--surface:#142130;
      --surface-soft:rgba(18,31,45,.82);--text:#f2f6f7;--muted:#9aabb7;
      --line:rgba(182,215,225,.13);--teal:#78ead6;--teal-dark:#35bda8;
      --orange:#ffad72;--violet:#aaa5ff;--radius:14px;
      --shadow:0 20px 55px rgba(0,0,0,.24);--container:1240px;
    }
    *,*::before,*::after{box-sizing:border-box}
    html{scroll-behavior:smooth;scroll-padding-top:92px}
    body{margin:0;background:var(--ink);color:var(--text);font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;font-size:15px;line-height:1.75}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none;transition:color .2s ease,background .2s ease,border-color .2s ease,transform .2s ease}
    button,input,select{font:inherit}
    button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid rgba(120,234,214,.75);outline-offset:3px}
    ::selection{background:var(--teal);color:var(--ink)}
    .container{width:min(var(--container),calc(100% - 48px));margin-inline:auto}
    .skip-link{position:absolute;left:12px;top:-60px;z-index:2000;background:var(--teal);color:var(--ink);padding:8px 14px;border-radius:8px}
    .skip-link:focus{top:12px}
    .site-header{position:sticky;top:0;z-index:1000;background:rgba(8,14,24,.91);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
    .nav-shell{min-height:76px;display:flex;align-items:center;gap:28px}
    .brand{display:flex;align-items:center;gap:11px;min-width:max-content;font-weight:800;font-size:16px;line-height:1.2}
    .brand-mark{width:37px;height:37px;display:grid;place-items:center;border:1px solid rgba(120,234,214,.38);border-radius:11px;background:rgba(120,234,214,.09);color:var(--teal);font-size:17px}
    .brand-copy small{display:block;color:var(--muted);font-size:10px;font-weight:500;margin-top:4px}
    .main-nav{display:flex;align-items:center;gap:6px;margin-left:8px}
    .main-nav a{padding:9px 13px;color:#bac6cd;border-radius:8px;font-size:13px}
    .main-nav a:hover,.main-nav a.active{color:var(--text);background:rgba(255,255,255,.07)}
    .main-nav a.active{box-shadow:inset 0 -2px var(--teal)}
    .nav-tools{margin-left:auto;display:flex;align-items:center;gap:12px}
    .nav-search{height:42px;width:210px;display:flex;align-items:center;gap:9px;padding:0 12px;border:1px solid var(--line);border-radius:9px;background:rgba(255,255,255,.035);color:var(--muted)}
    .nav-search input{width:100%;min-width:0;color:var(--text);background:transparent;border:0;outline:0;font-size:12px}
    .nav-search input::placeholder{color:#788994}
    .nav-search button{padding:0;border:0;background:none;color:var(--teal);line-height:1}
    .btn-main,.btn-quiet{min-height:42px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:0 17px;border:1px solid transparent;border-radius:9px;font-size:13px;font-weight:700;white-space:nowrap}
    .btn-main{background:var(--teal);color:#09201e;box-shadow:0 0 22px rgba(71,211,187,.17)}
    .btn-main:hover{background:#a2f6e6;color:#061817;transform:translateY(-2px);box-shadow:0 7px 25px rgba(71,211,187,.25)}
    .btn-quiet{border-color:var(--line);background:rgba(255,255,255,.035);color:var(--text)}
    .btn-quiet:hover{border-color:rgba(120,234,214,.45);background:rgba(120,234,214,.08);color:var(--teal);transform:translateY(-2px)}
    .menu-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:9px;background:transparent;color:var(--text)}
    .hero{position:relative;overflow:hidden;min-height:590px;display:flex;align-items:center;background:#0b1420}
    .hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,13,21,.97) 0%,rgba(7,13,21,.91) 39%,rgba(7,13,21,.25) 74%,rgba(7,13,21,.1) 100%);z-index:1}
    .hero-media{position:absolute;inset:0 0 0 34%;background-image:url("https://images.unsplash.com/photo-1489599849927-2ee91cede3ba?auto=format&fit=crop&w=2000&q=88");background-size:cover;background-position:center 43%;filter:saturate(.78)}
    .hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(8,14,24,.78),transparent 44%),linear-gradient(90deg,rgba(8,14,24,.4),transparent 55%)}
    .hero-inner{position:relative;z-index:2;padding-block:86px 76px}
    .hero-copy{max-width:620px}
    .eyebrow{display:inline-flex;align-items:center;gap:9px;color:var(--teal);font-size:11px;font-weight:700;letter-spacing:1px}
    .eyebrow::before{content:"";width:22px;height:1px;background:var(--teal)}
    h1,h2,h3,p{margin-top:0}
    .hero h1{max-width:650px;margin:18px 0 19px;font-size:clamp(36px,4vw,56px);font-weight:800;line-height:1.2}
    .hero-copy>p{max-width:570px;color:#c1cbd0;font-size:15px;line-height:1.95;margin-bottom:25px}
    .hero-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
    .hero-meta{display:flex;gap:22px;flex-wrap:wrap;margin-top:31px;color:#b5c2c9;font-size:12px}
    .hero-meta span{display:inline-flex;align-items:center;gap:7px}
    .hero-meta i{color:var(--teal)}
    .hero-stamp{position:absolute;z-index:2;right:max(24px,calc((100vw - var(--container))/2));bottom:32px;padding:12px 16px;border:1px solid rgba(255,255,255,.2);border-radius:10px;background:rgba(9,17,27,.64);backdrop-filter:blur(12px);font-size:11px;color:#d8e1e4}
    .hero-stamp strong{color:var(--teal);font-size:14px;margin-right:8px}
    main{overflow:hidden}
    .section{padding:82px 0;border-top:1px solid rgba(182,215,225,.07)}
    .section.alt{background:var(--ink-2)}
    .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:34px}
    .section-head h2{margin:10px 0 0;font-size:29px;line-height:1.35;font-weight:800}
    .section-head p{max-width:510px;margin:0;color:var(--muted);font-size:13px;line-height:1.85}
    .section-index{color:#61727d;font-size:11px;font-variant-numeric:tabular-nums}
    .metrics-band{display:grid;grid-template-columns:repeat(4,1fr);border-block:1px solid var(--line)}
    .metric{min-height:135px;padding:25px 26px;border-right:1px solid var(--line)}
    .metric:last-child{border-right:0}
    .metric strong{display:block;color:var(--teal);font-size:23px;font-weight:800;margin-bottom:6px}
    .metric span{display:block;color:#d5dfe2;font-size:13px;font-weight:700}
    .metric small{display:block;color:var(--muted);font-size:11px;margin-top:5px}
    .feature-layout{display:grid;grid-template-columns:1fr 1.4fr;gap:42px;align-items:start}
    .feature-intro{padding:12px 0}
    .feature-intro h2{font-size:29px;line-height:1.4;margin:12px 0}
    .feature-intro p{color:var(--muted);font-size:13px}
    .feature-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border-top:1px solid var(--line)}
    .feature-item{padding:23px 18px 23px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:38px 1fr;gap:13px}
    .feature-item:nth-child(odd){margin-right:20px}
    .feature-icon{width:36px;height:36px;display:grid;place-items:center;border:1px solid var(--line);border-radius:10px;color:var(--teal);background:rgba(120,234,214,.05)}
    .feature-item h3{font-size:14px;margin:1px 0 6px}
    .feature-item p{color:var(--muted);font-size:12px;line-height:1.8;margin:0}
    .search-panel{display:grid;grid-template-columns:1.4fr repeat(4,1fr) auto;gap:10px;padding:16px;border:1px solid var(--line);border-radius:12px;background:rgba(16,29,42,.76)}
    .search-panel .form-control,.search-panel .form-select{height:45px;border-color:var(--line);background-color:#0c1722;color:var(--text);font-size:12px}
    .search-panel .form-control::placeholder{color:#7b8c98}
    .search-panel .form-select{background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%239aabb7' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e")}
    .search-panel .form-control:focus,.search-panel .form-select:focus{border-color:var(--teal-dark);box-shadow:0 0 0 3px rgba(120,234,214,.12)}
    .search-panel .btn-main{height:45px}
    .filter-tags{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:18px;color:var(--muted);font-size:11px}
    .tag{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.025);color:#c4d0d5;font-size:11px}
    .tag:hover,.tag.selected{border-color:rgba(120,234,214,.45);color:var(--teal);background:rgba(120,234,214,.07)}
    .scene-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:14px;align-items:stretch}
    .scene{position:relative;min-height:205px;overflow:hidden;border:1px solid var(--line);border-radius:12px;background:#101b28}
    .scene:first-child{grid-row:span 2;min-height:424px}
    .scene img{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;transition:transform .5s ease}
    .scene:hover img{transform:scale(1.04)}
    .scene::after{content:"";position:absolute;inset:25% 0 0;background:linear-gradient(0deg,rgba(5,11,18,.91),transparent)}
    .scene-caption{position:absolute;z-index:1;left:18px;right:18px;bottom:16px}
    .scene-caption small{color:var(--teal);font-size:10px}
    .scene-caption h3{font-size:16px;margin:5px 0}
    .scene-caption p{font-size:11px;color:#c0ccd1;margin:0}
    .demo-stage{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(240px,.7fr);border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#101b28;box-shadow:var(--shadow)}
    .demo-image{position:relative;min-height:390px;background:#121d28}
    .demo-image img{position:absolute;width:100%;height:100%;inset:0;object-fit:cover}
    .demo-image::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(5,10,17,.8),transparent 45%)}
    .play-button{position:absolute;z-index:1;left:50%;top:50%;transform:translate(-50%,-50%);width:70px;height:70px;border-radius:50%;display:grid;place-items:center;color:#09201e;background:var(--teal);font-size:23px;box-shadow:0 0 0 10px rgba(120,234,214,.14),0 8px 34px rgba(0,0,0,.36)}
    .play-button:hover{transform:translate(-50%,-50%) scale(1.07);background:#a2f6e6}
    .demo-label{position:absolute;z-index:1;left:20px;bottom:17px;padding:6px 9px;border-radius:6px;background:rgba(5,10,17,.72);font-size:10px;color:#e7eeee}
    .demo-info{padding:27px 24px;display:flex;flex-direction:column}
    .demo-info .eyebrow{font-size:10px}
    .demo-info h3{font-size:20px;line-height:1.5;margin:13px 0}
    .demo-info p{color:var(--muted);font-size:12px}
    .demo-meta{display:grid;gap:12px;padding:15px 0;border-block:1px solid var(--line);margin:8px 0 17px}
    .demo-meta span{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:11px}
    .demo-meta strong{color:#dce5e7;font-weight:600}
    .progress-line{height:3px;background:#293844;margin-top:auto}
    .progress-line span{display:block;width:38%;height:100%;background:var(--orange)}
    .poster-rail{display:grid;grid-template-columns:1.2fr .8fr .8fr 1fr;gap:14px}
    .poster{min-width:0}
    .poster-frame{position:relative;aspect-ratio:4/3;overflow:hidden;border-radius:12px;border:1px solid var(--line);background:#131f2c}
    .poster:first-child .poster-frame{aspect-ratio:4/4.4}
    .poster-frame img{width:100%;height:100%;object-fit:cover;transition:transform .45s ease}
    .poster:hover .poster-frame img{transform:scale(1.05)}
    .poster-type{position:absolute;left:11px;top:11px;padding:5px 8px;border:1px solid rgba(255,255,255,.25);border-radius:6px;background:rgba(7,13,21,.72);color:#e8f0f0;font-size:9px}
    .poster h3{font-size:14px;line-height:1.55;margin:12px 0 5px}
    .poster-meta{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:10px}
    .case-strip{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:28px;padding:28px 32px;border-block:1px solid var(--line)}
    .case-step small{color:var(--muted);font-size:10px}
    .case-step h3{font-size:17px;margin:6px 0}
    .case-step p{color:var(--muted);font-size:12px;margin:0}
    .case-arrow{width:42px;height:42px;display:grid;place-items:center;border:1px solid rgba(120,234,214,.3);border-radius:50%;color:var(--teal)}
    .plans{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
    .plan{padding:26px 25px;border-right:1px solid var(--line)}
    .plan:last-child{border-right:0}
    .plan-featured{background:rgba(120,234,214,.045)}
    .plan-label{color:var(--teal);font-size:10px;font-weight:700}
    .plan h3{font-size:20px;margin:9px 0}
    .plan p{color:var(--muted);font-size:12px;min-height:42px}
    .plan ul{list-style:none;padding:0;margin:16px 0 20px}
    .plan li{font-size:11px;color:#c9d4d8;padding:7px 0;border-bottom:1px solid rgba(182,215,225,.08)}
    .plan li i{color:var(--teal);margin-right:8px}
    .plan .btn-quiet,.plan .btn-main{width:100%}
    .review-track{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .review{padding:20px 21px;border:1px solid var(--line);border-radius:12px;background:var(--surface-soft)}
    .review-stars{color:var(--orange);font-size:12px;letter-spacing:2px}
    .review blockquote{margin:12px 0 17px;color:#d8e1e3;font-size:13px;line-height:1.85}
    .review-by{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:12px;color:var(--muted);font-size:10px}
    .review-by strong{color:#e5ecee;font-size:11px}
    .word-of-mouth{display:grid;grid-template-columns:.8fr 1.2fr;align-items:center;gap:50px}
    .word-stat{border-left:2px solid var(--teal);padding:10px 0 10px 22px}
    .word-stat strong{display:block;font-size:35px;line-height:1.2}
    .word-stat span{display:block;color:var(--muted);font-size:12px;margin-top:8px}
    .quote-wall{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}
    .quote{padding:19px 21px;background:rgba(255,255,255,.025);border:1px solid var(--line);border-radius:10px}
    .quote p{margin:0 0 10px;color:#d8e1e3;font-size:13px}
    .quote small{color:var(--muted);font-size:10px}
    .faq-list{border-top:1px solid var(--line)}
    .faq-list details{border-bottom:1px solid var(--line)}
    .faq-list summary{list-style:none;position:relative;padding:20px 42px 20px 0;cursor:pointer;color:#e8eff0;font-size:14px;font-weight:700}
    .faq-list summary::-webkit-details-marker{display:none}
    .faq-list summary::after{content:"+";position:absolute;right:4px;top:15px;color:var(--teal);font-size:22px;font-weight:400}
    .faq-list details[open] summary::after{content:"−"}
    .faq-list details p{max-width:820px;padding:0 28px 18px 0;margin:0;color:var(--muted);font-size:12px;line-height:1.9}
    .guide-steps{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
    .guide-step{position:relative;padding:24px 20px 25px 0}
    .guide-step:not(:last-child)::after{content:"";position:absolute;right:18px;top:33px;width:20px;height:1px;background:var(--line)}
    .guide-step small{color:var(--teal);font-size:10px}
    .guide-step h3{font-size:14px;margin:8px 0}
    .guide-step p{color:var(--muted);font-size:11px;margin:0}
    .news-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:40px}
    .news-feature{position:relative;min-height:285px;overflow:hidden;border-radius:12px}
    .news-feature img{position:absolute;width:100%;height:100%;inset:0;object-fit:cover}
    .news-feature::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(6,12,19,.94),rgba(6,12,19,.02) 75%)}
    .news-feature-copy{position:absolute;z-index:1;left:22px;right:22px;bottom:20px}
    .news-feature-copy small{color:var(--teal);font-size:10px}
    .news-feature-copy h3{font-size:19px;line-height:1.5;margin:7px 0}
    .news-feature-copy p{color:#c1ccd0;font-size:11px;margin:0}
    .news-list{border-top:1px solid var(--line)}
    .news-item{display:grid;grid-template-columns:72px 1fr;gap:15px;padding:15px 0;border-bottom:1px solid var(--line)}
    .news-date{color:var(--teal);font-size:10px;padding-top:4px}
    .news-item h3{font-size:13px;margin:0 0 5px}
    .news-item p{color:var(--muted);font-size:11px;margin:0}
    .category-tiles{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
    .category-tile{min-height:150px;padding:21px;border-right:1px solid var(--line);transition:background .2s ease}
    .category-tile:last-child{border-right:0}
    .category-tile:hover{background:rgba(120,234,214,.055)}
    .category-tile small{color:var(--teal);font-size:10px}
    .category-tile h3{font-size:16px;margin:12px 0 7px}
    .category-tile p{color:var(--muted);font-size:11px;margin:0}
    .category-tile i{float:right;color:#71848e}
    .closing-band{position:relative;overflow:hidden;padding:42px 46px;border:1px solid rgba(120,234,214,.24);border-radius:14px;background:#101f2a}
    .closing-band::after{content:"";position:absolute;right:0;top:0;width:37%;height:100%;background-image:linear-gradient(90deg,#101f2a,rgba(16,31,42,.2)),url("https://images.unsplash.com/photo-1517604931442-7e0c8ed2963c?auto=format&fit=crop&w=800&q=80");background-size:cover;background-position:center;opacity:.45}
    .closing-content{position:relative;z-index:1;max-width:660px}
    .closing-content h2{font-size:27px;margin:11px 0}
    .closing-content p{max-width:540px;color:#b9c7cb;font-size:13px;margin-bottom:21px}
    .site-footer{background:#070c13;border-top:1px solid var(--line);padding:48px 0 22px}
    .footer-main{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:34px}
    .footer-brand p{max-width:390px;color:var(--muted);font-size:12px;margin:15px 0 0}
    .footer-column h3{font-size:12px;margin:4px 0 14px}
    .footer-links{display:grid;gap:9px}
    .footer-links a{width:max-content;max-width:100%;color:var(--muted);font-size:11px}
    .footer-links a:hover{color:var(--teal)}
    .footer-bottom{display:flex;justify-content:space-between;gap:18px;padding-top:17px;border-top:1px solid var(--line);color:#75848c;font-size:10px}
    .footer-bottom a{color:#9eabb1}
    .footer-bottom a:hover{color:var(--teal)}
    .to-top{position:fixed;right:20px;bottom:20px;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:rgba(10,18,27,.88);color:var(--teal);z-index:20}
    .to-top:hover{background:var(--teal);color:var(--ink)}
    .empty-state{display:none;padding:22px;text-align:center;border:1px dashed var(--line);border-radius:10px;color:var(--muted);font-size:12px}
    @media(max-width:1199px){
      .nav-shell{gap:15px}.main-nav a{padding-inline:9px}.nav-search{width:175px}
      .search-panel{grid-template-columns:1.4fr repeat(2,1fr) auto}
      .search-panel .form-select:nth-of-type(4),.search-panel .form-select:nth-of-type(5){display:none}
    }
    @media(max-width:991px){
      .menu-toggle{display:grid;place-items:center;margin-left:auto}
      .nav-tools{margin-left:0}
      .main-nav{display:none;position:absolute;top:76px;left:0;right:0;padding:12px 24px 18px;background:rgba(8,14,24,.98);border-bottom:1px solid var(--line);flex-wrap:wrap}
      .main-nav.open{display:flex}
      .nav-tools .nav-search{width:190px}
      .hero{min-height:555px}.hero-media{left:20%}
      .scene-grid{grid-template-columns:1fr 1fr}.scene:first-child{grid-row:auto;grid-column:span 2;min-height:330px}
      .poster-rail{grid-template-columns:repeat(2,minmax(0,1fr))}
      .poster:first-child .poster-frame{aspect-ratio:4/3}
      .news-layout{gap:25px}
      .category-tiles{grid-template-columns:repeat(2,1fr)}
      .category-tile:nth-child(2){border-right:0}.category-tile:nth-child(-n+2){border-bottom:1px solid var(--line)}
    }
    @media(max-width:767px){
      .container{width:min(100% - 36px,var(--container))}
      .nav-shell{min-height:68px}.main-nav{top:68px}
      .brand{font-size:14px}.brand-mark{width:34px;height:34px}
      .nav-tools{display:none}.main-nav.open{display:grid;grid-template-columns:1fr 1fr}
      .main-nav a{padding:11px}
      .hero{min-height:570px;align-items:flex-end}
      .hero-media{inset:0;background-position:58% center}
      .hero::before{background:linear-gradient(0deg,rgba(7,13,21,.98),rgba(7,13,21,.76) 53%,rgba(7,13,21,.18))}
      .hero-inner{padding-block:230px 45px}
      .hero h1{font-size:37px}
      .hero-copy>p{font-size:13px}
      .hero-stamp{right:18px;bottom:15px}
      .section{padding:61px 0}
      .section-head{display:block;margin-bottom:25px}
      .section-head h2{font-size:24px}
      .section-head p{margin-top:12px}
      .metrics-band{grid-template-columns:repeat(2,1fr)}
      .metric{min-height:115px;padding:20px 16px;border-bottom:1px solid var(--line)}
      .metric:nth-child(2){border-right:0}
      .metric:nth-child(n+3){border-bottom:0}
      .feature-layout{grid-template-columns:1fr;gap:15px}
      .feature-list{grid-template-columns:1fr 1fr}
      .feature-item:nth-child(odd){margin-right:12px}
      .search-panel{grid-template-columns:1fr 1fr}
      .search-panel .form-control{grid-column:span 2}
      .search-panel .form-select:nth-of-type(4){display:block}
      .search-panel .btn-main{grid-column:span 2}
      .demo-stage{grid-template-columns:1fr}
      .demo-image{min-height:320px}
      .demo-info{padding:21px}
      .demo-meta{grid-template-columns:1fr 1fr}
      .case-strip{gap:15px;padding:22px 0}
      .case-step h3{font-size:14px}
      .plans{grid-template-columns:1fr}
      .plan{border-right:0;border-bottom:1px solid var(--line)}
      .plan:last-child{border-bottom:0}
      .plan p{min-height:0}
      .review-track{grid-template-columns:1fr}
      .word-of-mouth{grid-template-columns:1fr;gap:25px}
      .quote-wall{grid-template-columns:1fr}
      .guide-steps{grid-template-columns:repeat(2,1fr)}
      .guide-step:nth-child(2)::after{display:none}
      .guide-step:nth-child(-n+2){border-bottom:1px solid var(--line)}
      .news-layout{grid-template-columns:1fr}
      .footer-main{grid-template-columns:1fr 1fr;gap:28px}
      .footer-brand{grid-column:span 2}
      .closing-band{padding:31px 25px}
      .closing-band::after{width:55%;opacity:.22}
      .footer-bottom{flex-direction:column}
    }
    @media(max-width:520px){
      .container{width:calc(100% - 30px)}
      .brand-copy small{display:none}
      .hero-inner{padding-top:205px}
      .hero h1{font-size:33px}
      .hero-actions .btn-main,.hero-actions .btn-quiet{min-height:40px;padding-inline:13px;font-size:12px}
      .hero-meta{gap:12px;margin-top:22px}
      .section-head h2{font-size:22px}
      .feature-list{grid-template-columns:1fr}
      .feature-item:nth-child(odd){margin-right:0}
      .search-panel{grid-template-columns:1fr 1fr;padding:12px}
      .search-panel .form-select{min-width:0;padding-right:28px}
      .scene-grid{grid-template-columns:1fr 1fr;gap:10px}
      .scene:first-child{min-height:280px}
      .scene{min-height:185px}
      .scene-caption{left:12px;right:12px;bottom:12px}
      .scene-caption h3{font-size:13px}
      .scene-caption p{font-size:10px}
      .poster-rail{gap:12px}
      .poster h3{font-size:12px}
      .demo-image{min-height:250px}
      .case-strip{grid-template-columns:1fr;gap:12px}
      .case-arrow{width:34px;height:34px;transform:rotate(90deg);margin-left:12px}
      .guide-steps{grid-template-columns:1fr 1fr}
      .category-tile{padding:16px;min-height:137px}
      .category-tile h3{font-size:14px}
      .news-feature{min-height:235px}
      .footer-main{grid-template-columns:1fr}
      .footer-brand{grid-column:auto}
      .closing-content h2{font-size:23px}
      .to-top{right:12px;bottom:12px}
    }
    @media(prefers-reduced-motion:reduce){
      *,*::before,*::after{scroll-behavior:auto!important;transition:none!important}
    }

/* roulang page: category1 */
:root{
      --ink:#080e18;--ink-2:#0d1623;--ink-3:#121e2b;--surface:#142130;
      --surface-soft:rgba(18,31,45,.82);--text:#f2f6f7;--muted:#9aabb7;
      --line:rgba(182,215,225,.13);--teal:#78ead6;--teal-dark:#35bda8;
      --orange:#ffad72;--violet:#aaa5ff;--radius:14px;
      --shadow:0 20px 55px rgba(0,0,0,.24);--container:1240px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth;scroll-padding-top:92px}
    body{margin:0;background:var(--ink);color:var(--text);font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;font-size:15px;line-height:1.75}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none;transition:color .2s ease,background .2s ease,border-color .2s ease,transform .2s ease}
    button,input,select{font:inherit}
    button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid rgba(120,234,214,.75);outline-offset:3px}
    .container{width:min(var(--container),calc(100% - 48px));margin-inline:auto}
    .site-header{position:sticky;top:0;z-index:1000;background:rgba(8,14,24,.93);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
    .nav-shell{min-height:76px;display:flex;align-items:center;gap:28px}
    .brand{display:flex;align-items:center;gap:11px;min-width:max-content;font-weight:800;font-size:16px;line-height:1.2}
    .brand-mark{width:37px;height:37px;display:grid;place-items:center;border:1px solid rgba(120,234,214,.38);border-radius:11px;background:rgba(120,234,214,.09);color:var(--teal);font-size:17px}
    .brand-copy small{display:block;color:var(--muted);font-size:10px;font-weight:500;margin-top:4px}
    .main-nav{display:flex;align-items:center;gap:6px;margin-left:8px}
    .main-nav a{padding:9px 13px;color:#bac6cd;border-radius:8px;font-size:13px}
    .main-nav a:hover,.main-nav a.active{color:var(--text);background:rgba(255,255,255,.07)}
    .main-nav a.active{box-shadow:inset 0 -2px var(--teal)}
    .nav-tools{margin-left:auto;display:flex;align-items:center;gap:12px}
    .nav-search{height:42px;width:210px;display:flex;align-items:center;gap:9px;padding:0 12px;border:1px solid var(--line);border-radius:9px;background:rgba(255,255,255,.035);color:var(--muted)}
    .nav-search input{width:100%;min-width:0;color:var(--text);background:transparent;border:0;outline:0;font-size:12px}
    .nav-search input::placeholder{color:#788994}
    .nav-search button{padding:0;border:0;background:none;color:var(--teal);line-height:1}
    .btn-main,.btn-quiet{min-height:42px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:0 17px;border:1px solid transparent;border-radius:9px;font-size:13px;font-weight:700;white-space:nowrap}
    .btn-main{background:var(--teal);color:#09201e;box-shadow:0 0 22px rgba(71,211,187,.17)}
    .btn-main:hover{background:#a2f6e6;color:#061817;transform:translateY(-2px);box-shadow:0 7px 25px rgba(71,211,187,.25)}
    .btn-quiet{border-color:var(--line);background:rgba(255,255,255,.035);color:var(--text)}
    .btn-quiet:hover{border-color:rgba(120,234,214,.45);background:rgba(120,234,214,.08);color:var(--teal);transform:translateY(-2px)}
    .menu-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:9px;background:transparent;color:var(--text)}
    .page-intro{position:relative;overflow:hidden;padding:37px 0 38px;background:linear-gradient(110deg,#101c29 0%,#0c1722 62%,#14212c 100%);border-bottom:1px solid var(--line)}
    .page-intro::after{content:"";position:absolute;right:0;top:0;bottom:0;width:34%;opacity:.32;background:repeating-linear-gradient(135deg,transparent 0 19px,rgba(120,234,214,.12) 20px 21px)}
    .intro-content{position:relative;z-index:1}
    .breadcrumb{--bs-breadcrumb-divider:"/";margin-bottom:14px;font-size:11px;color:var(--muted)}
    .breadcrumb-item a{color:#b7c5cb}
    .breadcrumb-item a:hover{color:var(--teal)}
    .breadcrumb-item.active{color:#71828d}
    .breadcrumb-item+.breadcrumb-item::before{color:#647680}
    .eyebrow{display:inline-flex;align-items:center;gap:9px;color:var(--teal);font-size:11px;font-weight:700}
    .eyebrow::before{content:"";width:22px;height:1px;background:var(--teal)}
    .page-intro h1{max-width:850px;margin:9px 0 9px;font-size:36px;font-weight:800;line-height:1.3}
    .intro-summary{max-width:770px;margin:0;color:#bcc8ce;font-size:13px;line-height:1.9}
    .intro-meta{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:18px;color:#aebdc4;font-size:11px}
    .intro-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--orange)}
    main{overflow:hidden}
    .section{padding:57px 0;border-top:1px solid rgba(182,215,225,.07)}
    .section.alt{background:var(--ink-2)}
    .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:25px}
    .section-head h2{margin:9px 0 0;font-size:25px;line-height:1.4;font-weight:800}
    .section-head p{max-width:510px;margin:0;color:var(--muted);font-size:12px;line-height:1.85}
    .section-index{color:#71818b;font-size:10px;font-variant-numeric:tabular-nums;white-space:nowrap}
    .search-panel{display:grid;grid-template-columns:1.45fr repeat(4,minmax(112px,1fr)) auto;gap:10px;padding:15px;border:1px solid var(--line);border-radius:12px;background:rgba(18,31,45,.78);box-shadow:var(--shadow)}
    .search-panel .form-control,.search-panel .form-select{height:43px;min-width:0;border-color:var(--line);border-radius:8px;background-color:#0b1520;color:var(--text);font-size:12px}
    .search-panel .form-control::placeholder{color:#748590}
    .search-panel .form-select{--bs-form-select-bg-img:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%239aabb7' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e")}
    .search-panel .form-control:focus,.search-panel .form-select:focus{border-color:rgba(120,234,214,.7);box-shadow:0 0 0 .2rem rgba(120,234,214,.12)}
    .filter-submit{min-height:43px;padding:0 16px;border:1px solid rgba(120,234,214,.36);border-radius:8px;background:rgba(120,234,214,.12);color:var(--teal);font-size:12px;font-weight:700}
    .filter-submit:hover{background:var(--teal);color:#08201d}
    .filter-submit:disabled{opacity:.45;cursor:not-allowed}
    .filter-tags{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:14px}
    .filter-caption{color:#768792;font-size:11px;margin-right:4px}
    .filter-chip,.tag{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border:1px solid var(--line);border-radius:20px;background:rgba(255,255,255,.025);color:#b7c4ca;font-size:10px}
    .filter-chip:hover{border-color:rgba(120,234,214,.4);color:var(--teal)}
    .filter-chip.selected{border-color:rgba(120,234,214,.34);background:rgba(120,234,214,.1);color:var(--teal)}
    .content-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:30px;align-items:start}
    .result-bar{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:0 0 14px;border-bottom:1px solid var(--line);margin-bottom:17px}
    .result-count{font-size:12px;color:#d8e0e3}
    .result-count strong{color:var(--teal);font-size:15px;margin-right:5px}
    .sort-control{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:11px}
    .sort-control select{background:#0b1520;color:var(--text);border:1px solid var(--line);border-radius:7px;padding:6px 26px 6px 9px;font-size:11px}
    .feature-result{display:grid;grid-template-columns:280px minmax(0,1fr);min-height:210px;margin-bottom:15px;overflow:hidden;border:1px solid var(--line);border-radius:13px;background:linear-gradient(110deg,rgba(20,33,48,.95),rgba(15,26,39,.82));transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease}
    .feature-result:hover{transform:translateY(-2px);border-color:rgba(120,234,214,.32);box-shadow:0 14px 36px rgba(0,0,0,.23)}
    .result-image{position:relative;min-height:210px;overflow:hidden;background:#101923}
    .result-image img{width:100%;height:100%;min-height:210px;object-fit:cover;transition:transform .5s ease}
    .feature-result:hover .result-image img,.mini-result:hover img{transform:scale(1.035)}
    .result-image::after{content:"";position:absolute;inset:45% 0 0;background:linear-gradient(0deg,rgba(4,9,14,.72),transparent)}
    .image-label{position:absolute;left:13px;bottom:12px;z-index:1;display:inline-flex;gap:6px;align-items:center;padding:5px 8px;border:1px solid rgba(255,255,255,.18);border-radius:6px;background:rgba(8,14,24,.72);backdrop-filter:blur(8px);color:#e5ecee;font-size:10px}
    .result-body{display:flex;flex-direction:column;justify-content:center;padding:20px 22px}
    .result-kicker{display:flex;align-items:center;gap:8px;margin-bottom:7px;color:var(--teal);font-size:10px}
    .result-kicker .tag{padding:3px 8px;border-color:rgba(120,234,214,.22);background:rgba(120,234,214,.06);color:var(--teal)}
    .result-body h3{margin:0 0 8px;font-size:19px;line-height:1.45;font-weight:750}
    .result-body h3 a:hover{color:var(--teal)}
    .result-body p{max-width:680px;margin:0 0 14px;color:var(--muted);font-size:12px;line-height:1.85}
    .result-meta{display:flex;align-items:center;gap:13px;flex-wrap:wrap;color:#899aa4;font-size:10px}
    .result-meta span{display:inline-flex;align-items:center;gap:5px}
    .result-meta i{color:#9bcfc5}
    .result-actions{display:flex;align-items:center;gap:9px;margin-top:15px}
    .mini-button{display:inline-flex;align-items:center;gap:7px;padding:7px 11px;border:1px solid rgba(120,234,214,.3);border-radius:7px;background:rgba(120,234,214,.08);color:var(--teal);font-size:10px;font-weight:700}
    .mini-button:hover{background:var(--teal);color:#09201e}
    .text-link{color:#b4c1c7;font-size:10px}
    .text-link:hover{color:var(--teal)}
    .secondary-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .mini-result{display:grid;grid-template-columns:112px minmax(0,1fr);min-height:118px;overflow:hidden;border:1px solid var(--line);border-radius:11px;background:rgba(18,31,45,.58);transition:border-color .2s ease,transform .2s ease}
    .mini-result:hover{border-color:rgba(120,234,214,.3);transform:translateY(-2px)}
    .mini-image{overflow:hidden;min-height:118px;background:#111d29}
    .mini-image img{width:100%;height:100%;object-fit:cover;transition:transform .45s ease}
    .mini-copy{align-self:center;padding:12px}
    .mini-copy .tag{margin-bottom:6px;padding:3px 7px;font-size:9px}
    .mini-copy h3{margin:0 0 5px;font-size:12px;line-height:1.55}
    .mini-copy p{margin:0;color:var(--muted);font-size:10px;line-height:1.7}
    .mini-copy .mini-meta{margin-top:7px;color:#7f909a;font-size:9px}
    .empty-state{display:none;padding:30px 18px;border:1px dashed rgba(182,215,225,.22);border-radius:11px;text-align:center;color:var(--muted);font-size:12px}
    .empty-state i{display:block;margin-bottom:8px;color:#81939d;font-size:22px}
    .side-panel{position:sticky;top:100px}
    .side-block{padding:19px 18px;border:1px solid var(--line);border-radius:12px;background:rgba(18,31,45,.6)}
    .side-block+.side-block{margin-top:16px}
    .side-title{display:flex;align-items:center;justify-content:space-between;gap:10px;padding-bottom:13px;border-bottom:1px solid var(--line);margin-bottom:7px}
    .side-title h2{margin:0;font-size:14px;font-weight:750}
    .side-title span{color:#72848e;font-size:9px}
    .rank-list{list-style:none;padding:0;margin:0;counter-reset:rank}
    .rank-list li{counter-increment:rank}
    .rank-link{display:grid;grid-template-columns:24px minmax(0,1fr);gap:9px;padding:11px 0;border-bottom:1px solid rgba(182,215,225,.08)}
    .rank-link:last-child{border-bottom:0}
    .rank-number{color:#70818b;font-size:12px;font-variant-numeric:tabular-nums}
    .rank-list li:nth-child(-n+3) .rank-number{color:var(--orange)}
    .rank-name{display:block;font-size:11px;line-height:1.5}
    .rank-detail{display:block;margin-top:3px;color:#7f9099;font-size:9px}
    .rank-link:hover .rank-name{color:var(--teal)}
    .topic-cloud{display:flex;flex-wrap:wrap;gap:7px;margin-top:13px}
    .topic-cloud a{padding:6px 9px;border:1px solid var(--line);border-radius:7px;color:#adbcc3;font-size:10px}
    .topic-cloud a:hover{border-color:rgba(120,234,214,.4);color:var(--teal);background:rgba(120,234,214,.05)}
    .side-note{padding:15px;border-left:2px solid var(--teal-dark);background:rgba(120,234,214,.045);color:#aebcc2;font-size:11px;line-height:1.85}
    .side-note strong{display:block;margin-bottom:4px;color:var(--text);font-size:12px}
    .more-row{display:flex;justify-content:center;padding-top:29px}
    .more-button{min-height:43px;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:0 21px;border:1px solid rgba(120,234,214,.37);border-radius:9px;background:rgba(120,234,214,.08);color:var(--teal);font-size:12px;font-weight:700}
    .more-button:hover{transform:translateY(-2px);background:var(--teal);color:#08201d;box-shadow:0 7px 25px rgba(71,211,187,.18)}
    .update-track{position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;margin-top:5px}
    .update-track::before{content:"";position:absolute;top:8px;left:8px;right:8px;height:1px;background:linear-gradient(90deg,var(--teal-dark),rgba(182,215,225,.12))}
    .update-item{position:relative;padding:27px 20px 0 0}
    .update-item::before{content:"";position:absolute;top:3px;left:0;width:11px;height:11px;border:2px solid var(--teal);border-radius:50%;background:var(--ink-2);box-shadow:0 0 12px rgba(120,234,214,.2)}
    .update-date{color:var(--teal);font-size:10px;font-variant-numeric:tabular-nums}
    .update-item h3{margin:7px 0 5px;font-size:13px;line-height:1.55}
    .update-item p{margin:0;color:var(--muted);font-size:10px;line-height:1.75}
    .update-type{display:inline-block;margin-top:9px;padding:3px 7px;border-radius:5px;background:rgba(255,173,114,.1);color:var(--orange);font-size:9px}
    .faq-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:45px}
    .faq-intro h2{margin:10px 0;font-size:24px;line-height:1.4}
    .faq-intro p{margin:0;color:var(--muted);font-size:12px;line-height:1.9}
    .faq-list{border-top:1px solid var(--line)}
    .faq-list details{border-bottom:1px solid var(--line)}
    .faq-list summary{position:relative;list-style:none;padding:16px 34px 16px 0;color:#e5ebed;font-size:12px;font-weight:650;cursor:pointer}
    .faq-list summary::-webkit-details-marker{display:none}
    .faq-list summary::after{content:"+";position:absolute;right:4px;top:12px;color:var(--teal);font-size:18px;font-weight:400}
    .faq-list details[open] summary::after{content:"−"}
    .faq-list details p{max-width:690px;margin:-3px 0 16px;color:var(--muted);font-size:11px;line-height:1.85}
    .site-footer{padding:47px 0 20px;background:#070c13;border-top:1px solid rgba(182,215,225,.1)}
    .footer-main{display:grid;grid-template-columns:1.35fr .75fr .75fr;gap:50px;padding-bottom:33px}
    .footer-brand .brand{margin-bottom:15px}
    .footer-brand p{max-width:440px;margin:0;color:#8999a3;font-size:11px;line-height:1.9}
    .footer-column h3{margin:5px 0 14px;color:#e5ecee;font-size:12px}
    .footer-links{display:grid;gap:8px}
    .footer-links a{width:max-content;color:#8d9ca5;font-size:10px}
    .footer-links a:hover,.footer-bottom a:hover{color:var(--teal)}
    .footer-bottom{display:flex;justify-content:space-between;gap:18px;padding-top:17px;border-top:1px solid rgba(182,215,225,.09);color:#697982;font-size:9px}
    .footer-bottom a{color:#8998a0}
    @media(max-width:1199px){
      .nav-shell{gap:18px}.nav-search{width:175px}
      .search-panel{grid-template-columns:repeat(3,minmax(0,1fr))}
      .filter-submit{grid-column:span 1}
      .content-layout{grid-template-columns:minmax(0,1fr) 265px;gap:20px}
      .feature-result{grid-template-columns:245px minmax(0,1fr)}
    }
    @media(max-width:991px){
      .nav-shell{min-height:70px;flex-wrap:wrap;gap:0}
      .brand{padding:15px 0}
      .menu-toggle{display:grid;place-items:center;margin-left:auto}
      .nav-tools{display:none;width:100%;order:3;margin:0;padding:0 0 14px}
      .nav-tools.is-open{display:flex}
      .nav-search{width:auto;flex:1}
      .main-nav{display:none;order:4;width:100%;margin:0;padding:0 0 12px}
      .main-nav.is-open{display:flex}
      .content-layout{grid-template-columns:1fr}
      .side-panel{position:static;display:grid;grid-template-columns:1fr 1fr;gap:14px}
      .side-block+.side-block{margin-top:0}
      .side-block:last-child{grid-column:span 2}
      .page-intro::after{width:25%}
      .footer-main{gap:30px}
    }
    @media(max-width:767px){
      .container{width:min(var(--container),calc(100% - 32px))}
      .page-intro{padding:28px 0 30px}
      .page-intro h1{font-size:29px}
      .intro-summary{font-size:12px}
      .section{padding:43px 0}
      .section-head{display:block;margin-bottom:20px}
      .section-head h2{font-size:21px}
      .section-head p{margin-top:8px}
      .section-index{display:block;margin-top:7px}
      .search-panel{grid-template-columns:repeat(2,minmax(0,1fr));padding:12px}
      .search-panel .search-keyword{grid-column:span 2}
      .filter-submit{grid-column:span 2}
      .feature-result{grid-template-columns:210px minmax(0,1fr)}
      .result-image,.result-image img{min-height:220px}
      .result-body{padding:16px}
      .result-body h3{font-size:16px}
      .result-body p{font-size:11px}
      .secondary-results{grid-template-columns:1fr}
      .update-track{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:22px}
      .update-track::before{display:none}
      .update-item{padding-top:0;padding-left:18px}
      .update-item::before{top:5px}
      .faq-grid{grid-template-columns:1fr;gap:22px}
      .footer-main{grid-template-columns:1fr 1fr}
      .footer-brand{grid-column:span 2}
      .footer-bottom{flex-direction:column;gap:8px}
    }
    @media(max-width:575px){
      .brand{font-size:14px}
      .brand-mark{width:34px;height:34px}
      .nav-tools.is-open{flex-wrap:wrap}
      .nav-search{flex-basis:100%}
      .nav-tools .btn-main{width:100%}
      .main-nav{gap:4px}
      .main-nav a{padding:8px 11px;font-size:12px}
      .page-intro::after{width:42%;opacity:.17}
      .page-intro h1{font-size:25px}
      .intro-meta{gap:7px}
      .search-panel{gap:8px}
      .search-panel .form-control,.search-panel .form-select{font-size:11px}
      .content-layout{gap:24px}
      .feature-result{grid-template-columns:1fr}
      .result-image,.result-image img{height:auto;min-height:0;aspect-ratio:16/9}
      .result-body{padding:16px}
      .mini-result{grid-template-columns:100px minmax(0,1fr)}
      .side-panel{grid-template-columns:1fr}
      .side-block:last-child{grid-column:auto}
      .update-track{grid-template-columns:1fr 1fr}
      .footer-main{grid-template-columns:1fr;gap:24px}
      .footer-brand{grid-column:auto}
      .footer-bottom{font-size:9px}
    }
    @media(prefers-reduced-motion:reduce){
      *,*::before,*::after{scroll-behavior:auto!important;transition:none!important}
    }