/* roulang page: index */
:root{
      --color-primary:#635bff;
      --color-primary-dark:#4740d9;
      --color-primary-soft:#ecebff;
      --color-secondary:#00b894;
      --color-accent:#ffb020;
      --color-danger:#ff5a6a;
      --color-ink:#101828;
      --color-text:#334155;
      --color-muted:#64748b;
      --color-light:#f8fafc;
      --color-panel:#ffffff;
      --color-panel-2:#f1f5f9;
      --color-border:#e2e8f0;
      --color-dark:#0f172a;
      --shadow-sm:0 8px 24px rgba(15,23,42,.08);
      --shadow-md:0 18px 45px rgba(15,23,42,.12);
      --shadow-lg:0 30px 80px rgba(15,23,42,.18);
      --radius-sm:12px;
      --radius-md:18px;
      --radius-lg:28px;
      --radius-xl:36px;
      --container:1160px;
      --nav-height:78px;
      --ease:all .22s ease;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      color:var(--color-text);
      background:
        radial-gradient(circle at top left, rgba(99,91,255,.12), transparent 32rem),
        radial-gradient(circle at 85% 8%, rgba(0,184,148,.10), transparent 28rem),
        linear-gradient(180deg,#fbfdff 0%,#f8fafc 42%,#ffffff 100%);
      line-height:1.78;
      -webkit-font-smoothing:antialiased;
      text-rendering:optimizeLegibility;
    }
    a{color:inherit;text-decoration:none;transition:var(--ease)}
    a:hover{color:var(--color-primary)}
    img{max-width:100%;height:auto;display:block}
    button,input,textarea,select{font:inherit}
    button{cursor:pointer}
    ::selection{background:var(--color-primary);color:#fff}

    .site-container{
      width:min(100% - 36px,var(--container));
      margin-inline:auto;
    }

    .site-header{
      position:sticky;
      top:0;
      z-index:50;
      background:rgba(255,255,255,.82);
      backdrop-filter:blur(18px);
      border-bottom:1px solid rgba(226,232,240,.78);
    }
    .brand-row{
      min-height:var(--nav-height);
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:18px;
    }
    .brand{
      display:inline-flex;
      align-items:center;
      gap:12px;
      font-weight:900;
      letter-spacing:.2px;
      color:var(--color-ink);
      font-size:22px;
    }
    .brand-mark{
      width:42px;
      height:42px;
      border-radius:15px;
      display:grid;
      place-items:center;
      color:#fff;
      background:
        linear-gradient(135deg,var(--color-primary),#7c3aed 52%,var(--color-secondary));
      box-shadow:0 12px 28px rgba(99,91,255,.28);
      font-size:18px;
    }
    .nav-area{
      display:flex;
      align-items:center;
      gap:14px;
      flex:1;
      justify-content:flex-end;
    }
    .icon-nav{
      display:grid;
      grid-auto-flow:column;
      grid-auto-columns:max-content;
      gap:10px;
      align-items:center;
    }
    .nav-tile{
      display:inline-flex;
      align-items:center;
      gap:9px;
      padding:11px 15px;
      border:1px solid transparent;
      border-radius:16px;
      color:var(--color-muted);
      font-weight:750;
      background:rgba(248,250,252,.7);
    }
    .nav-tile i{font-size:15px;color:var(--color-primary)}
    .nav-tile:hover{
      background:#fff;
      border-color:var(--color-border);
      box-shadow:var(--shadow-sm);
      transform:translateY(-1px);
      color:var(--color-ink);
    }
    .nav-tile.active{
      background:var(--color-primary-soft);
      color:var(--color-primary-dark);
      border-color:rgba(99,91,255,.18);
    }
    .nav-search{
      width:246px;
      position:relative;
    }
    .nav-search i{
      position:absolute;
      left:14px;
      top:50%;
      transform:translateY(-50%);
      color:#94a3b8;
      pointer-events:none;
    }
    .nav-search input{
      width:100%;
      height:44px;
      border:1px solid var(--color-border);
      border-radius:16px;
      background:#fff;
      color:var(--color-ink);
      padding:0 14px 0 40px;
      outline:none;
      transition:var(--ease);
    }
    .nav-search input:focus{
      border-color:rgba(99,91,255,.55);
      box-shadow:0 0 0 4px rgba(99,91,255,.12);
    }
    .header-cta{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:12px 16px;
      border-radius:16px;
      color:#fff;
      font-weight:850;
      background:var(--color-dark);
      box-shadow:0 12px 30px rgba(15,23,42,.16);
    }
    .header-cta:hover{
      color:#fff;
      background:var(--color-primary);
      transform:translateY(-1px);
    }
    .mobile-menu-button{
      display:none;
      width:44px;
      height:44px;
      border:1px solid var(--color-border);
      border-radius:14px;
      background:#fff;
      color:var(--color-ink);
      align-items:center;
      justify-content:center;
    }
    .mobile-menu-button:focus,
    .btn:focus,
    .form-control:focus{
      outline:3px solid rgba(99,91,255,.20);
      outline-offset:3px;
    }

    .hero{
      padding:58px 0 34px;
    }
    .hero-stage{
      border:1px solid rgba(226,232,240,.95);
      border-radius:var(--radius-xl);
      background:
        linear-gradient(135deg,rgba(15,23,42,.97),rgba(39,38,86,.96) 55%,rgba(20,184,166,.92)),
        radial-gradient(circle at 10% 10%,rgba(255,255,255,.12),transparent 24rem);
      color:#fff;
      overflow:hidden;
      position:relative;
      box-shadow:var(--shadow-lg);
    }
    .hero-stage:before{
      content:"";
      position:absolute;
      inset:0;
      background-image:
        linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
        linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
      background-size:38px 38px;
      mask-image:linear-gradient(120deg,rgba(0,0,0,.95),rgba(0,0,0,.12));
      pointer-events:none;
    }
    .hero-inner{
      position:relative;
      display:grid;
      grid-template-columns:1.2fr .8fr;
      gap:28px;
      padding:42px;
      align-items:stretch;
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 12px;
      border-radius:999px;
      background:rgba(255,255,255,.10);
      border:1px solid rgba(255,255,255,.16);
      color:rgba(255,255,255,.92);
      font-size:14px;
      font-weight:800;
      margin-bottom:18px;
    }
    h1{
      margin:0;
      font-size:clamp(34px,5.2vw,64px);
      line-height:1.08;
      letter-spacing:-1.8px;
      color:#fff;
      max-width:860px;
    }
    .hero-lead{
      margin:20px 0 0;
      max-width:780px;
      color:rgba(255,255,255,.82);
      font-size:18px;
      line-height:1.9;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:28px;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:9px;
      min-height:48px;
      padding:13px 18px;
      border-radius:16px;
      border:1px solid transparent;
      font-weight:900;
      transition:var(--ease);
      white-space:nowrap;
    }
    .btn-primary{
      background:#fff;
      color:var(--color-dark);
      box-shadow:0 16px 32px rgba(0,0,0,.18);
    }
    .btn-primary:hover{
      color:var(--color-primary-dark);
      transform:translateY(-2px);
      box-shadow:0 20px 42px rgba(0,0,0,.24);
    }
    .btn-ghost{
      background:rgba(255,255,255,.10);
      border-color:rgba(255,255,255,.20);
      color:#fff;
    }
    .btn-ghost:hover{
      background:rgba(255,255,255,.16);
      color:#fff;
      transform:translateY(-2px);
    }
    .btn-dark{
      background:var(--color-dark);
      color:#fff;
      box-shadow:0 16px 35px rgba(15,23,42,.16);
    }
    .btn-dark:hover{
      background:var(--color-primary);
      color:#fff;
      transform:translateY(-2px);
    }
    .btn-light{
      background:#fff;
      color:var(--color-primary-dark);
      border-color:var(--color-border);
    }
    .btn-light:hover{
      border-color:rgba(99,91,255,.38);
      box-shadow:var(--shadow-sm);
      transform:translateY(-1px);
    }
    .hero-points{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:12px;
      margin-top:30px;
      max-width:820px;
    }
    .point{
      padding:14px;
      border-radius:18px;
      background:rgba(255,255,255,.08);
      border:1px solid rgba(255,255,255,.12);
    }
    .point strong{
      display:block;
      color:#fff;
      font-size:22px;
      line-height:1.1;
      margin-bottom:4px;
    }
    .point span{color:rgba(255,255,255,.74);font-size:13px}

    .course-card{
      align-self:stretch;
      border-radius:28px;
      background:rgba(255,255,255,.96);
      color:var(--color-ink);
      padding:22px;
      box-shadow:0 26px 70px rgba(0,0,0,.25);
      display:flex;
      flex-direction:column;
      justify-content:space-between;
      min-height:360px;
    }
    .card-topline{
      display:flex;
      justify-content:space-between;
      align-items:center;
      gap:10px;
      margin-bottom:18px;
    }
    .badge{
      display:inline-flex;
      align-items:center;
      gap:7px;
      padding:7px 10px;
      border-radius:999px;
      font-size:13px;
      font-weight:850;
      color:var(--color-primary-dark);
      background:var(--color-primary-soft);
      border:1px solid rgba(99,91,255,.14);
    }
    .status-dot{
      width:8px;
      height:8px;
      border-radius:999px;
      background:var(--color-secondary);
      box-shadow:0 0 0 5px rgba(0,184,148,.12);
    }
    .course-card h2{
      font-size:26px;
      line-height:1.2;
      color:var(--color-ink);
      margin:0 0 12px;
      letter-spacing:-.7px;
    }
    .course-card p{
      color:var(--color-muted);
      margin:0 0 18px;
      line-height:1.8;
    }
    .lesson-list{
      list-style:none;
      padding:0;
      margin:0;
      display:grid;
      gap:10px;
    }
    .lesson-list li{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:12px;
      padding:12px;
      background:var(--color-light);
      border:1px solid var(--color-border);
      border-radius:16px;
    }
    .lesson-list span{
      display:flex;
      align-items:center;
      gap:9px;
      font-weight:800;
      color:var(--color-ink);
    }
    .lesson-list small{
      color:var(--color-muted);
      font-weight:700;
    }
    .course-footer{
      display:flex;
      gap:10px;
      flex-wrap:wrap;
      margin-top:20px;
    }

    main{overflow:hidden}
    .section{
      padding:58px 0;
    }
    .section-alt{
      background:linear-gradient(180deg,rgba(241,245,249,.75),rgba(255,255,255,.92));
      border-top:1px solid rgba(226,232,240,.75);
      border-bottom:1px solid rgba(226,232,240,.75);
    }
    .section-head{
      display:flex;
      align-items:flex-end;
      justify-content:space-between;
      gap:26px;
      margin-bottom:26px;
    }
    .section-title{
      margin:0;
      color:var(--color-ink);
      font-size:clamp(26px,3vw,42px);
      line-height:1.18;
      letter-spacing:-1px;
      font-weight:950;
    }
    .section-desc{
      margin:12px 0 0;
      color:var(--color-muted);
      max-width:720px;
      line-height:1.9;
      font-size:16px;
    }
    .section-link{
      flex:0 0 auto;
      display:inline-flex;
      align-items:center;
      gap:8px;
      color:var(--color-primary-dark);
      font-weight:900;
    }
    .section-link:hover{gap:12px}

    .metric-board{
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:18px;
      align-items:stretch;
    }
    .metric-main{
      border-radius:var(--radius-lg);
      background:#fff;
      border:1px solid var(--color-border);
      box-shadow:var(--shadow-md);
      padding:24px;
      position:relative;
      overflow:hidden;
    }
    .metric-main:after{
      content:"";
      position:absolute;
      right:-60px;
      top:-60px;
      width:190px;
      height:190px;
      background:rgba(99,91,255,.10);
      border-radius:999px;
    }
    .metric-row{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:14px;
      margin-top:20px;
    }
    .metric-item{
      padding:18px;
      border-radius:20px;
      background:var(--color-light);
      border:1px solid var(--color-border);
    }
    .metric-item strong{
      display:block;
      color:var(--color-ink);
      font-size:34px;
      line-height:1.1;
      letter-spacing:-1px;
      margin-bottom:8px;
    }
    .metric-item span{
      color:var(--color-muted);
      font-size:14px;
      display:block;
      line-height:1.7;
    }
    .notice-card{
      border-radius:var(--radius-lg);
      padding:24px;
      background:linear-gradient(145deg,#111827,#1e1b4b);
      color:#fff;
      box-shadow:var(--shadow-md);
      position:relative;
      overflow:hidden;
    }
    .notice-card:before{
      content:"";
      position:absolute;
      inset:auto -40px -70px auto;
      width:210px;
      height:210px;
      background:rgba(0,184,148,.18);
      border-radius:999px;
    }
    .notice-card h3,
    .metric-main h3{
      margin:0 0 10px;
      font-size:24px;
      line-height:1.28;
      color:inherit;
      font-weight:950;
    }
    .notice-card p{
      position:relative;
      color:rgba(255,255,255,.78);
      margin:0 0 18px;
    }
    .check-list{
      list-style:none;
      padding:0;
      margin:0;
      display:grid;
      gap:12px;
      position:relative;
    }
    .check-list li{
      display:flex;
      gap:10px;
      align-items:flex-start;
      color:rgba(255,255,255,.86);
    }
    .check-list i{
      color:var(--color-secondary);
      margin-top:6px;
    }

    .material-layout{
      display:grid;
      grid-template-columns:.75fr 1.25fr;
      gap:22px;
      align-items:start;
    }
    .side-panel{
      border-radius:var(--radius-lg);
      background:var(--color-dark);
      color:#fff;
      padding:26px;
      min-height:100%;
      box-shadow:var(--shadow-md);
    }
    .side-panel h3{
      margin:0 0 12px;
      font-size:28px;
      color:#fff;
      line-height:1.25;
    }
    .side-panel p{color:rgba(255,255,255,.76);margin:0 0 20px}
    .mini-code{
      border-radius:18px;
      background:rgba(255,255,255,.08);
      border:1px solid rgba(255,255,255,.12);
      padding:16px;
      font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
      color:#d1fae5;
      line-height:1.8;
      font-size:13px;
      overflow:auto;
    }
    .material-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:16px;
    }
    .material-card,
    .topic-card,
    .compare-card,
    .faq-item,
    .news-panel,
    .settle-card{
      background:#fff;
      border:1px solid var(--color-border);
      border-radius:var(--radius-md);
      box-shadow:var(--shadow-sm);
      transition:var(--ease);
    }
    .material-card{
      padding:20px;
      min-height:176px;
    }
    .material-card:hover,
    .topic-card:hover,
    .compare-card:hover,
    .faq-item:hover,
    .settle-card:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow-md);
      border-color:rgba(99,91,255,.24);
    }
    .icon-box{
      width:46px;
      height:46px;
      border-radius:16px;
      display:grid;
      place-items:center;
      background:var(--color-primary-soft);
      color:var(--color-primary);
      font-size:19px;
      margin-bottom:14px;
    }
    .material-card h3,
    .topic-card h3,
    .compare-card h3,
    .settle-card h3{
      margin:0 0 8px;
      color:var(--color-ink);
      font-size:20px;
      line-height:1.35;
      font-weight:950;
    }
    .material-card p,
    .topic-card p,
    .compare-card p,
    .settle-card p{
      margin:0;
      color:var(--color-muted);
      line-height:1.8;
    }

    .compare-wrap{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:18px;
    }
    .compare-card{
      padding:24px;
      position:relative;
      overflow:hidden;
    }
    .compare-card.featured{
      background:linear-gradient(180deg,#ffffff,#f5f3ff);
      border-color:rgba(99,91,255,.22);
    }
    .compare-list{
      list-style:none;
      padding:0;
      margin:18px 0 0;
      display:grid;
      gap:12px;
    }
    .compare-list li{
      display:flex;
      gap:10px;
      align-items:flex-start;
      color:var(--color-text);
    }
    .compare-list i{
      margin-top:6px;
      color:var(--color-primary);
    }
    .compare-card:not(.featured) .compare-list i{color:#94a3b8}

    .topic-grid{
      display:grid;
      grid-template-columns:1.2fr .8fr .8fr;
      gap:16px;
    }
    .topic-card{
      padding:22px;
      min-height:190px;
      display:flex;
      flex-direction:column;
      justify-content:space-between;
    }
    .topic-card.large{
      grid-row:span 2;
      background:
        linear-gradient(145deg,rgba(99,91,255,.94),rgba(0,184,148,.88)),
        radial-gradient(circle at top right,rgba(255,255,255,.22),transparent 16rem);
      color:#fff;
      box-shadow:var(--shadow-md);
    }
    .topic-card.large h3{color:#fff;font-size:30px}
    .topic-card.large p{color:rgba(255,255,255,.84)}
    .tag-row{
      display:flex;
      gap:8px;
      flex-wrap:wrap;
      margin-top:18px;
    }
    .tag{
      display:inline-flex;
      align-items:center;
      padding:6px 10px;
      border-radius:999px;
      background:var(--color-panel-2);
      color:var(--color-muted);
      font-size:13px;
      font-weight:800;
    }
    .topic-card.large .tag{
      background:rgba(255,255,255,.14);
      color:#fff;
      border:1px solid rgba(255,255,255,.16);
    }

    .media-strip{
      display:flex;
      gap:16px;
      overflow-x:auto;
      padding:4px 4px 18px;
      scroll-snap-type:x mandatory;
    }
    .media-strip::-webkit-scrollbar{height:8px}
    .media-strip::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:999px}
    .media-card{
      flex:0 0 310px;
      scroll-snap-align:start;
      border:1px solid var(--color-border);
      background:#fff;
      border-radius:24px;
      overflow:hidden;
      box-shadow:var(--shadow-sm);
      transition:var(--ease);
    }
    .media-card:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow-md);
    }
    .media-thumb{
      height:150px;
      padding:18px;
      display:flex;
      align-items:flex-end;
      background:
        linear-gradient(135deg,rgba(99,91,255,.92),rgba(15,23,42,.88)),
        radial-gradient(circle at 20% 20%,rgba(255,255,255,.28),transparent 12rem);
      color:#fff;
      position:relative;
      overflow:hidden;
    }
    .media-thumb:after{
      content:"";
      position:absolute;
      right:-26px;
      top:-26px;
      width:110px;
      height:110px;
      border-radius:30px;
      border:1px solid rgba(255,255,255,.22);
      transform:rotate(18deg);
    }
    .media-type{
      position:relative;
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:7px 10px;
      border-radius:999px;
      background:rgba(255,255,255,.14);
      border:1px solid rgba(255,255,255,.18);
      font-weight:850;
      font-size:13px;
    }
    .media-body{padding:18px}
    .media-body h3{
      margin:0 0 8px;
      color:var(--color-ink);
      font-size:19px;
      line-height:1.35;
      font-weight:950;
    }
    .media-body p{
      margin:0;
      color:var(--color-muted);
      line-height:1.75;
    }

    .news-layout{
      display:grid;
      grid-template-columns:1.25fr .75fr;
      gap:20px;
      align-items:start;
    }
    .news-panel{
      padding:22px;
    }
    .news-list{
      list-style:none;
      padding:0;
      margin:0;
      display:grid;
      gap:0;
    }
    .news-list li + li{border-top:1px solid var(--color-border)}
    .news-link{
      display:grid;
      grid-template-columns:auto 1fr auto;
      gap:14px;
      align-items:center;
      padding:16px 0;
      color:var(--color-ink);
    }
    .news-date{
      color:var(--color-muted);
      font-size:13px;
      font-weight:850;
      min-width:72px;
    }
    .news-link strong{
      font-size:17px;
      line-height:1.45;
      transition:var(--ease);
    }
    .news-link span{
      color:var(--color-muted);
      font-size:14px;
    }
    .news-link:hover strong{color:var(--color-primary)}
    .recommend-card{
      border-radius:var(--radius-lg);
      background:#fff;
      border:1px solid var(--color-border);
      padding:24px;
      box-shadow:var(--shadow-md);
    }
    .recommend-card h3{
      margin:0 0 10px;
      color:var(--color-ink);
      font-size:24px;
      line-height:1.25;
    }
    .recommend-card p{
      margin:0 0 16px;
      color:var(--color-muted);
    }
    .recommend-meta{
      display:grid;
      gap:10px;
      margin:18px 0;
    }
    .recommend-meta div{
      display:flex;
      justify-content:space-between;
      gap:12px;
      padding:12px;
      border-radius:14px;
      background:var(--color-light);
      border:1px solid var(--color-border);
      font-weight:800;
      color:var(--color-ink);
    }
    .recommend-meta span{color:var(--color-muted);font-weight:700}

    .settle-grid{
      display:grid;
      grid-template-columns:repeat(4,1fr);
      gap:16px;
      counter-reset:step;
    }
    .settle-card{
      padding:22px;
      position:relative;
    }
    .settle-card:before{
      counter-increment:step;
      content:"0" counter(step);
      display:inline-grid;
      place-items:center;
      width:42px;
      height:42px;
      border-radius:15px;
      background:var(--color-dark);
      color:#fff;
      font-weight:950;
      margin-bottom:16px;
    }
    .settle-note{
      margin-top:18px;
      padding:16px 18px;
      border-radius:18px;
      background:#fff7ed;
      border:1px solid #fed7aa;
      color:#9a3412;
      font-weight:750;
    }

    .faq-layout{
      display:grid;
      grid-template-columns:.72fr 1.28fr;
      gap:22px;
      align-items:start;
    }
    .faq-aside{
      border-radius:var(--radius-lg);
      background:linear-gradient(145deg,#0f172a,#312e81);
      color:#fff;
      padding:26px;
      position:sticky;
      top:104px;
      box-shadow:var(--shadow-md);
    }
    .faq-aside h3{
      color:#fff;
      margin:0 0 12px;
      font-size:28px;
      line-height:1.25;
    }
    .faq-aside p{color:rgba(255,255,255,.76);margin:0}
    .faq-list{
      display:grid;
      gap:14px;
    }
    .faq-item{
      padding:20px 22px;
    }
    .faq-item summary{
      list-style:none;
      cursor:pointer;
      color:var(--color-ink);
      font-size:18px;
      font-weight:950;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary:after{
      content:"+";
      width:30px;
      height:30px;
      border-radius:999px;
      display:grid;
      place-items:center;
      background:var(--color-primary-soft);
      color:var(--color-primary);
      flex:0 0 auto;
      transition:var(--ease);
    }
    .faq-item[open] summary:after{
      content:"−";
      background:var(--color-primary);
      color:#fff;
    }
    .faq-item p{
      margin:14px 0 0;
      color:var(--color-muted);
      line-height:1.9;
    }

    .join-box{
      border-radius:var(--radius-xl);
      background:
        linear-gradient(135deg,#ffffff 0%,#f5f3ff 52%,#ecfeff 100%);
      border:1px solid rgba(99,91,255,.18);
      box-shadow:var(--shadow-lg);
      overflow:hidden;
    }
    .join-inner{
      display:grid;
      grid-template-columns:.9fr 1.1fr;
      gap:0;
    }
    .join-copy{
      padding:34px;
      border-right:1px solid rgba(99,91,255,.14);
    }
    .countdown{
      display:grid;
      grid-template-columns:repeat(4,1fr);
      gap:10px;
      margin:24px 0;
    }
    .count-cell{
      padding:14px 8px;
      border-radius:18px;
      background:#fff;
      border:1px solid var(--color-border);
      text-align:center;
      box-shadow:var(--shadow-sm);
    }
    .count-cell strong{
      display:block;
      color:var(--color-primary-dark);
      font-size:28px;
      line-height:1.1;
    }
    .count-cell span{
      color:var(--color-muted);
      font-size:12px;
      font-weight:850;
    }
    .join-form{
      padding:34px;
      background:rgba(255,255,255,.72);
    }
    .form-grid{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:14px;
    }
    .form-field{
      display:grid;
      gap:8px;
    }
    .form-field.full{grid-column:1/-1}
    .form-field label{
      color:var(--color-ink);
      font-weight:900;
      font-size:14px;
    }
    .form-control{
      width:100%;
      min-height:48px;
      border:1px solid var(--color-border);
      border-radius:16px;
      background:#fff;
      padding:12px 14px;
      color:var(--color-ink);
      outline:none;
      transition:var(--ease);
    }
    textarea.form-control{
      min-height:112px;
      resize:vertical;
    }
    .form-control:focus{
      border-color:rgba(99,91,255,.56);
      box-shadow:0 0 0 4px rgba(99,91,255,.12);
    }
    .form-hint{
      margin:12px 0 18px;
      color:var(--color-muted);
      font-size:14px;
      line-height:1.7;
    }

    .site-footer{
      padding:42px 0 26px;
      background:#0b1120;
      color:rgba(255,255,255,.76);
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:28px;
      align-items:start;
    }
    .footer-brand{
      display:flex;
      align-items:center;
      gap:12px;
      color:#fff;
      font-size:22px;
      font-weight:950;
      margin-bottom:14px;
    }
    .footer-brand .brand-mark{box-shadow:none}
    .footer-text{
      max-width:680px;
      color:rgba(255,255,255,.70);
      margin:0;
      line-height:1.9;
    }
    .footer-links{
      display:flex;
      gap:12px;
      flex-wrap:wrap;
      justify-content:flex-end;
    }
    .footer-links a{
      padding:10px 12px;
      border-radius:14px;
      background:rgba(255,255,255,.06);
      border:1px solid rgba(255,255,255,.10);
      color:rgba(255,255,255,.78);
      font-weight:800;
    }
    .footer-links a:hover{
      color:#fff;
      background:rgba(255,255,255,.11);
    }
    .copyright{
      margin-top:28px;
      padding-top:20px;
      border-top:1px solid rgba(255,255,255,.10);
      display:flex;
      justify-content:space-between;
      gap:18px;
      flex-wrap:wrap;
      color:rgba(255,255,255,.55);
      font-size:14px;
    }

    @media (max-width:1024px){
      .nav-search{display:none}
      .hero-inner{grid-template-columns:1fr;padding:34px}
      .course-card{min-height:auto}
      .metric-board,
      .material-layout,
      .news-layout,
      .faq-layout,
      .join-inner{grid-template-columns:1fr}
      .join-copy{border-right:0;border-bottom:1px solid rgba(99,91,255,.14)}
      .settle-grid{grid-template-columns:repeat(2,1fr)}
      .topic-grid{grid-template-columns:1fr 1fr}
      .topic-card.large{grid-row:auto;grid-column:1/-1}
      .faq-aside{position:relative;top:auto}
    }

    @media (max-width:768px){
      :root{--nav-height:auto}
      .site-container{width:min(100% - 28px,var(--container))}
      .brand-row{
        flex-wrap:wrap;
        padding:14px 0;
      }
      .mobile-menu-button{display:inline-flex}
      .nav-area{
        width:100%;
        display:none;
        flex-direction:column;
        align-items:stretch;
      }
      .site-header.menu-open .nav-area{display:flex}
      .icon-nav{
        grid-auto-flow:row;
        grid-template-columns:repeat(2,1fr);
        width:100%;
      }
      .nav-tile{justify-content:center}
      .header-cta{justify-content:center}
      .hero{padding-top:30px}
      .hero-inner{padding:26px}
      .hero-points,
      .metric-row,
      .compare-wrap,
      .material-grid,
      .form-grid{
        grid-template-columns:1fr;
      }
      .section{padding:46px 0}
      .section-head{
        display:block;
        margin-bottom:22px;
      }
      .section-link{margin-top:12px}
      .countdown{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:1fr}
      .footer-links{justify-content:flex-start}
      h1{letter-spacing:-1.2px}
    }

    @media (max-width:520px){
      .brand{font-size:20px}
      .brand-mark{width:38px;height:38px;border-radius:13px}
      .hero-inner{padding:22px;border-radius:24px}
      .hero-stage{border-radius:26px}
      .hero-actions .btn,
      .course-footer .btn{
        width:100%;
      }
      .course-card{padding:18px;border-radius:22px}
      .course-card h2{font-size:23px}
      .metric-main,
      .notice-card,
      .side-panel,
      .recommend-card,
      .faq-aside,
      .join-copy,
      .join-form{
        padding:20px;
      }
      .settle-grid,
      .topic-grid{
        grid-template-columns:1fr;
      }
      .news-link{
        grid-template-columns:1fr auto;
      }
      .news-date{grid-column:1/-1}
      .media-card{flex-basis:278px}
      .count-cell strong{font-size:24px}
      .copyright{display:block}
    }