/* roulang page: index */
:root{
      --bg:#050b1e;
      --bg2:#07122a;
      --panel:rgba(12,20,44,.62);
      --panel-strong:rgba(10,18,38,.82);
      --line:rgba(132,202,255,.18);
      --line-strong:rgba(132,202,255,.28);
      --text:#eaf2ff;
      --muted:#93a6c7;
      --accent:#37f3dd;
      --accent2:#6f8cff;
      --accent3:#7de4ff;
      --radius:24px;
      --radius-sm:18px;
      --shadow:0 18px 50px rgba(2,8,23,.42);
      --shadow-soft:0 12px 30px rgba(2,8,23,.26);
      --container:1280px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--text);
      background:
        radial-gradient(1200px 700px at 15% 10%, rgba(111,140,255,.16), transparent 45%),
        radial-gradient(900px 540px at 85% 15%, rgba(55,243,221,.11), transparent 42%),
        radial-gradient(900px 620px at 50% 100%, rgba(59,130,246,.10), transparent 48%),
        linear-gradient(180deg, #040816 0%, #061028 48%, #040816 100%);
      font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
      line-height:1.75;
      overflow-x:hidden;
      padding-top:88px;
    }
    body::before{
      content:"";
      position:fixed;
      inset:0;
      pointer-events:none;
      background-image:
        linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
      background-size: 34px 34px;
      mask-image: linear-gradient(180deg, rgba(0,0,0,.5), transparent 85%);
      opacity:.35;
      z-index:0;
    }
    a{color:inherit;text-decoration:none;transition:all .22s ease}
    img{max-width:100%;display:block}
    button,input,textarea,select{font:inherit}
    ::selection{background:rgba(55,243,221,.22);color:#fff}
    .site-wrap{position:relative;z-index:1}
    .container-site{
      width:min(var(--container), calc(100% - 2rem));
      margin-inline:auto;
    }
    .glass{
      background:linear-gradient(180deg, rgba(16,24,52,.74), rgba(8,15,36,.62));
      border:1px solid rgba(155, 196, 255, .14);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      box-shadow: var(--shadow-soft);
    }
    .glass-strong{
      background:linear-gradient(180deg, rgba(13,21,46,.90), rgba(8,14,30,.82));
      border:1px solid rgba(155, 196, 255, .16);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      box-shadow: var(--shadow);
    }
    .section-block{
      padding: clamp(3.5rem, 4vw, 5.5rem) 0;
      position:relative;
    }
    .section-title{
      letter-spacing:-0.03em;
      line-height:1.12;
    }
    .section-kicker{
      display:inline-flex;
      align-items:center;
      gap:.5rem;
      padding:.45rem .85rem;
      border-radius:999px;
      border:1px solid rgba(125,228,255,.18);
      background:rgba(125,228,255,.08);
      color:#cdf8ff;
      font-size:.86rem;
      letter-spacing:.02em;
    }
    .section-note{
      color:var(--muted);
      max-width: 62rem;
      font-size:1.02rem;
    }
    .nav-shell{
      position:fixed;
      inset: 16px 0 auto 0;
      z-index:50;
      pointer-events:none;
    }
    .nav-inner{
      width:min(var(--container), calc(100% - 1rem));
      margin:0 auto;
      pointer-events:auto;
    }
    .nav-pill{
      border-radius:999px;
      background:linear-gradient(180deg, rgba(18,26,53,.82), rgba(10,18,38,.62));
      border:1px solid rgba(146, 188, 255, .16);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      box-shadow:0 12px 40px rgba(2,8,23,.36);
    }
    .brand-mark{
      display:inline-flex;
      align-items:center;
      gap:.72rem;
      font-weight:800;
      letter-spacing:-0.04em;
    }
    .brand-dot{
      width:1.1rem;height:1.1rem;border-radius:999px;
      background:radial-gradient(circle at 30% 30%, #fff 0 12%, var(--accent) 18%, rgba(55,243,221,.12) 70%, transparent 72%),
                 linear-gradient(135deg, var(--accent2), var(--accent));
      box-shadow:0 0 0 6px rgba(55,243,221,.06), 0 0 22px rgba(55,243,221,.28);
    }
    .nav-link{
      position:relative;
      padding:.72rem 1rem;
      color:#d7e5ff;
      border-radius:999px;
      font-size:.96rem;
      line-height:1;
      white-space:nowrap;
    }
    .nav-link:hover,
    .nav-link:focus-visible{
      background:rgba(125,228,255,.08);
      color:#fff;
      transform:translateY(-1px);
      outline:none;
    }
    .nav-link.active{
      background:linear-gradient(135deg, rgba(55,243,221,.15), rgba(111,140,255,.14));
      color:#fff;
      box-shadow: inset 0 0 0 1px rgba(55,243,221,.18);
    }
    .menu-btn{
      width:2.75rem;height:2.75rem;
      border-radius:999px;
      border:1px solid rgba(146, 188, 255, .16);
      background:rgba(255,255,255,.03);
      color:#eaf2ff;
      display:inline-flex;
      align-items:center;
      justify-content:center;
    }
    .menu-btn:hover,
    .menu-btn:focus-visible{
      background:rgba(125,228,255,.09);
      box-shadow:0 0 0 3px rgba(55,243,221,.10);
      outline:none;
    }
    .mobile-drawer{
      display:none;
      margin-top:.75rem;
      border-radius: 22px;
      padding:.9rem;
      border:1px solid rgba(146, 188, 255, .14);
      background:linear-gradient(180deg, rgba(14,22,44,.96), rgba(8,15,32,.92));
      box-shadow: var(--shadow-soft);
    }
    .mobile-drawer.open{display:block}
    .chip{
      display:inline-flex;
      align-items:center;
      gap:.45rem;
      padding:.48rem .78rem;
      border-radius:999px;
      border:1px solid rgba(125,228,255,.16);
      background:rgba(125,228,255,.06);
      color:#dff8ff;
      font-size:.88rem;
    }
    .chip:hover,
    .chip:focus-visible{
      background:rgba(55,243,221,.1);
      border-color:rgba(55,243,221,.22);
      transform:translateY(-1px);
      outline:none;
    }
    .btn-primary,
    .btn-secondary{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:.55rem;
      min-height:3.1rem;
      padding:.85rem 1.2rem;
      border-radius:999px;
      font-weight:700;
      letter-spacing:-0.01em;
      transition:all .22s ease;
      border:1px solid transparent;
      user-select:none;
    }
    .btn-primary{
      color:#04111b;
      background:linear-gradient(135deg, var(--accent) 0%, #a8fff4 55%, #7de4ff 100%);
      box-shadow:0 12px 35px rgba(55,243,221,.24), 0 0 0 1px rgba(255,255,255,.1) inset;
    }
    .btn-primary:hover,
    .btn-primary:focus-visible{
      transform:translateY(-2px);
      box-shadow:0 14px 38px rgba(55,243,221,.30), 0 0 0 1px rgba(255,255,255,.14) inset;
      outline:none;
    }
    .btn-primary:active{transform:translateY(0)}
    .btn-secondary{
      color:#eaf2ff;
      border-color:rgba(146,188,255,.18);
      background:rgba(255,255,255,.03);
      box-shadow: inset 0 0 0 1px rgba(255,255,255,.02);
    }
    .btn-secondary:hover,
    .btn-secondary:focus-visible{
      transform:translateY(-2px);
      border-color:rgba(125,228,255,.30);
      background:rgba(125,228,255,.08);
      outline:none;
    }
    .btn-secondary:active{transform:translateY(0)}
    .btn-ghost{
      color:#d7e5ff;
      border:1px solid rgba(146,188,255,.12);
      background:rgba(255,255,255,.02);
    }
    .btn-ghost:hover{background:rgba(125,228,255,.07)}
    .panel{
      border-radius:var(--radius);
      border:1px solid rgba(146,188,255,.14);
      background:linear-gradient(180deg, rgba(14,22,45,.7), rgba(8,14,29,.66));
      box-shadow:var(--shadow-soft);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
    }
    .panel:hover{
      border-color:rgba(125,228,255,.22);
      box-shadow:0 20px 45px rgba(2,8,23,.4);
    }
    .panel-soft{
      border-radius:22px;
      border:1px solid rgba(146,188,255,.12);
      background:rgba(255,255,255,.03);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
    }
    .hero-title{
      letter-spacing:-0.05em;
      line-height:1.02;
    }
    .hero-search{
      position:relative;
    }
    .hero-search input{
      width:100%;
      border-radius:999px;
      border:1px solid rgba(146,188,255,.16);
      background:rgba(3,8,21,.55);
      color:var(--text);
      padding:1rem 1.1rem 1rem 1.2rem;
      outline:none;
      transition:all .22s ease;
      box-shadow: inset 0 0 0 1px rgba(255,255,255,.01);
    }
    .hero-search input::placeholder{color:#7f92b4}
    .hero-search input:focus{
      border-color:rgba(55,243,221,.28);
      box-shadow:0 0 0 4px rgba(55,243,221,.10), 0 16px 40px rgba(2,8,23,.32);
    }
    .hero-search button{
      position:absolute;
      right:.45rem;
      top:.45rem;
      bottom:.45rem;
      min-width:7.7rem;
      border:none;
    }
    .stat-mini{
      border-radius:20px;
      border:1px solid rgba(146,188,255,.14);
      background:linear-gradient(180deg, rgba(8,16,34,.7), rgba(12,20,44,.56));
      padding:1rem;
    }
    .stat-mini .num{
      display:block;
      font-size:1.45rem;
      line-height:1.05;
      font-weight:800;
      letter-spacing:-0.04em;
      background:linear-gradient(135deg, #fff 0%, #c9fdf8 30%, #7de4ff 70%, #b8c7ff 100%);
      -webkit-background-clip:text;
      background-clip:text;
      color:transparent;
    }
    .stat-mini .label{color:var(--muted);font-size:.86rem}
    .notebook-card{
      position:relative;
      overflow:hidden;
      padding:1.2rem;
      border-radius:22px;
      border:1px solid rgba(146,188,255,.14);
      background:
        linear-gradient(180deg, rgba(11,20,42,.78), rgba(8,14,29,.62)),
        linear-gradient(90deg, rgba(55,243,221,.04), transparent 30%);
    }
    .notebook-card::before{
      content:"";
      position:absolute;
      inset:0 auto 0 0;
      width:4px;
      background:linear-gradient(180deg, var(--accent), var(--accent2));
      box-shadow:0 0 18px rgba(55,243,221,.4);
    }
    .notebook-tag{
      display:inline-flex;
      align-items:center;
      gap:.35rem;
      font-size:.82rem;
      color:#dff8ff;
      padding:.26rem .65rem;
      border-radius:999px;
      background:rgba(55,243,221,.08);
      border:1px solid rgba(55,243,221,.14);
    }
    .arrow-link{
      display:inline-flex;
      align-items:center;
      gap:.4rem;
      color:#dff8ff;
      font-weight:700;
    }
    .arrow-link:hover{color:#fff;transform:translateX(2px)}
    .metric-card{
      border-radius:22px;
      border:1px solid rgba(146,188,255,.14);
      background:linear-gradient(180deg, rgba(9,16,36,.8), rgba(12,20,44,.58));
      padding:1.15rem;
      transition:all .22s ease;
    }
    .metric-card:hover{
      transform:translateY(-3px);
      border-color:rgba(55,243,221,.22);
      box-shadow:0 18px 40px rgba(2,8,23,.35);
    }
    .metric-num{
      font-size:clamp(1.5rem, 2vw, 2.2rem);
      line-height:1;
      font-weight:800;
      letter-spacing:-0.05em;
      background:linear-gradient(135deg, #fff 0%, #baf7ff 35%, #7de4ff 100%);
      -webkit-background-clip:text;
      background-clip:text;
      color:transparent;
    }
    .metric-desc{color:var(--muted);font-size:.92rem}
    .list-link{
      display:flex;
      gap:1rem;
      padding:1rem 1rem;
      border-radius:22px;
      border:1px solid rgba(146,188,255,.12);
      background:rgba(255,255,255,.03);
      transition:all .22s ease;
    }
    .list-link:hover{
      transform:translateY(-2px);
      border-color:rgba(55,243,221,.20);
      background:rgba(55,243,221,.05);
      box-shadow:0 12px 34px rgba(2,8,23,.28);
    }
    .list-meta{
      color:#9db0d2;
      font-size:.84rem;
    }
    .list-title{
      font-weight:700;
      line-height:1.35;
      color:#f4f8ff;
    }
    .list-summary{
      color:var(--muted);
      font-size:.93rem;
      margin-top:.45rem;
    }
    .result-badge{
      display:inline-flex;
      align-items:center;
      gap:.42rem;
      padding:.36rem .7rem;
      border-radius:999px;
      color:#defcff;
      background:rgba(55,243,221,.08);
      border:1px solid rgba(55,243,221,.16);
      font-size:.82rem;
    }
    .timeline{
      position:relative;
    }
    .timeline::before{
      content:"";
      position:absolute;
      left:1rem;
      right:1rem;
      top:2rem;
      height:2px;
      background:linear-gradient(90deg, rgba(55,243,221,.05), rgba(55,243,221,.38), rgba(111,140,255,.3), rgba(55,243,221,.08));
    }
    .timeline-step{
      position:relative;
      padding-top:3.2rem;
    }
    .timeline-step::before{
      content:"";
      position:absolute;
      top:1.55rem;
      left:50%;
      width:.9rem;
      height:.9rem;
      border-radius:999px;
      transform:translateX(-50%);
      background:linear-gradient(135deg, var(--accent), var(--accent2));
      box-shadow:0 0 0 6px rgba(55,243,221,.08), 0 0 22px rgba(55,243,221,.22);
    }
    .quote-card{
      border-radius:24px;
      padding:1.25rem;
      border:1px solid rgba(146,188,255,.14);
      background:linear-gradient(180deg, rgba(13,21,44,.72), rgba(7,13,29,.58));
      position:relative;
      overflow:hidden;
    }
    .quote-card::after{
      content:"";
      position:absolute;
      inset:auto -12% -34% auto;
      width:180px;height:180px;
      border-radius:999px;
      background:radial-gradient(circle, rgba(55,243,221,.14), transparent 68%);
      pointer-events:none;
    }
    .quote-mark{
      font-size:2.2rem;
      line-height:1;
      color:rgba(125,228,255,.55);
      margin-bottom:.3rem;
    }
    .avatar{
      width:2.7rem;height:2.7rem;border-radius:999px;
      background:linear-gradient(135deg, rgba(55,243,221,.24), rgba(111,140,255,.36));
      border:1px solid rgba(255,255,255,.10);
      box-shadow:0 0 0 4px rgba(255,255,255,.03);
    }
    details.faq-item{
      border-radius:22px;
      border:1px solid rgba(146,188,255,.14);
      background:rgba(255,255,255,.03);
      overflow:hidden;
      transition:all .22s ease;
    }
    details.faq-item:hover{
      border-color:rgba(55,243,221,.20);
      background:rgba(55,243,221,.04);
    }
    details.faq-item summary{
      list-style:none;
      cursor:pointer;
      padding:1.05rem 1.1rem;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:1rem;
      font-weight:700;
      color:#f4f8ff;
    }
    details.faq-item summary::-webkit-details-marker{display:none}
    .faq-answer{
      padding:0 1.1rem 1.1rem;
      color:var(--muted);
    }
    details[open].faq-item summary{
      color:#fff;
      border-bottom:1px solid rgba(146,188,255,.12);
      background:rgba(255,255,255,.02);
    }
    .field{
      display:flex;
      flex-direction:column;
      gap:.55rem;
    }
    .field label{
      color:#d8e5ff;
      font-size:.92rem;
      font-weight:600;
    }
    .field input,
    .field textarea{
      width:100%;
      border-radius:18px;
      border:1px solid rgba(146,188,255,.16);
      background:rgba(3,8,21,.52);
      color:var(--text);
      padding:.95rem 1rem;
      outline:none;
      transition:all .22s ease;
    }
    .field textarea{
      min-height:112px;
      resize:vertical;
    }
    .field input::placeholder,
    .field textarea::placeholder{color:#7f92b4}
    .field input:focus,
    .field textarea:focus{
      border-color:rgba(55,243,221,.28);
      box-shadow:0 0 0 4px rgba(55,243,221,.10);
    }
    .floating-cta{
      position:fixed;
      left:50%;
      bottom:18px;
      transform:translateX(-50%);
      width:min(980px, calc(100% - 1rem));
      z-index:40;
    }
    .floating-cta-inner{
      border-radius:999px;
      border:1px solid rgba(146,188,255,.14);
      background:linear-gradient(180deg, rgba(12,20,44,.86), rgba(8,15,32,.76));
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      box-shadow:0 18px 45px rgba(2,8,23,.38);
      padding:.85rem .95rem;
    }
    .toast{
      position:fixed;
      right:18px;
      bottom:92px;
      z-index:60;
      opacity:0;
      transform:translateY(10px);
      pointer-events:none;
      transition:all .25s ease;
    }
    .toast.show{
      opacity:1;
      transform:translateY(0);
    }
    .footer-link{
      color:#cddcff;
    }
    .footer-link:hover,
    .footer-link:focus-visible{
      color:#fff;
      text-decoration:none;
      outline:none;
    }
    .empty-state{
      border-radius:24px;
      border:1px dashed rgba(146,188,255,.22);
      background:rgba(255,255,255,.03);
      color:#cddcff;
      padding:1.4rem;
      text-align:center;
    }
    .soft-divider{
      height:1px;
      background:linear-gradient(90deg, transparent, rgba(146,188,255,.16), transparent);
    }
    @media (max-width: 1024px){
      body{padding-top:82px}
      .floating-cta{display:none}
    }
    @media (max-width: 768px){
      .nav-shell{inset:10px 0 auto 0}
      .mobile-hide{display:none !important}
      .hero-title{font-size:clamp(2.2rem, 8vw, 3.7rem)}
      .section-block{padding:3.2rem 0}
      .timeline::before{display:none}
      .timeline-step{padding-top:0}
      .timeline-step::before{display:none}
      body{padding-top:80px}
    }
    @media (max-width: 640px){
      .container-site{width:min(var(--container), calc(100% - 1.1rem))}
      .section-note{font-size:.96rem}
      .btn-primary,.btn-secondary{width:100%}
      .hero-search button{position:static; width:100%; margin-top:.6rem}
      .hero-search input{padding-right:1rem}
    }

/* roulang page: article */
:root{
      --bg:#050b1e;
      --bg2:#07122a;
      --panel:rgba(12,20,44,.62);
      --panel-strong:rgba(10,18,38,.82);
      --line:rgba(132,202,255,.18);
      --line-strong:rgba(132,202,255,.28);
      --text:#eaf2ff;
      --muted:#93a6c7;
      --accent:#37f3dd;
      --accent2:#6f8cff;
      --accent3:#7de4ff;
      --radius:24px;
      --radius-sm:18px;
      --shadow:0 18px 50px rgba(2,8,23,.42);
      --shadow-soft:0 12px 30px rgba(2,8,23,.26);
      --container:1280px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--text);
      background:
        radial-gradient(1200px 700px at 15% 10%, rgba(111,140,255,.16), transparent 45%),
        radial-gradient(900px 540px at 85% 15%, rgba(55,243,221,.11), transparent 42%),
        radial-gradient(900px 620px at 50% 100%, rgba(59,130,246,.10), transparent 48%),
        linear-gradient(180deg, #040816 0%, #061028 48%, #040816 100%);
      font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
      line-height:1.75;
      overflow-x:hidden;
      padding-top:88px;
    }
    body::before{
      content:"";
      position:fixed;
      inset:0;
      pointer-events:none;
      background-image:
        linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
      background-size:34px 34px;
      mask-image: linear-gradient(180deg, rgba(0,0,0,.45), transparent 84%);
      opacity:.35;
      z-index:0;
    }
    a{
      color:inherit;
      text-decoration:none;
      transition:all .22s ease;
    }
    a:hover{color:#fff}
    img{max-width:100%;display:block}
    button,input,textarea,select{
      font:inherit;
    }
    button{
      cursor:pointer;
    }
    :focus-visible{
      outline:2px solid rgba(55,243,221,.55);
      outline-offset:3px;
    }
    ::selection{
      background:rgba(55,243,221,.22);
      color:#fff;
    }
    ::-webkit-scrollbar{width:10px;height:10px}
    ::-webkit-scrollbar-track{background:rgba(255,255,255,.03)}
    ::-webkit-scrollbar-thumb{
      background:linear-gradient(180deg, rgba(55,243,221,.45), rgba(111,140,255,.5));
      border-radius:999px;
      border:2px solid rgba(5,11,30,.9);
    }

    .container-site{
      width:min(var(--container), calc(100% - 2rem));
      margin-inline:auto;
      position:relative;
      z-index:1;
    }
    .section-block{
      padding: clamp(3.5rem, 4vw, 5.5rem) 0;
      position:relative;
      z-index:1;
    }
    .soft-divider{
      height:1px;
      width:100%;
      background:linear-gradient(90deg, transparent, rgba(125,228,255,.34), rgba(55,243,221,.18), transparent);
    }
    .glass-card{
      background:linear-gradient(180deg, rgba(16,26,54,.72), rgba(8,15,34,.58));
      border:1px solid var(--line);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      position:relative;
      overflow:hidden;
    }
    .glass-card::before{
      content:"";
      position:absolute;
      inset:0;
      background:linear-gradient(135deg, rgba(255,255,255,.07), transparent 28%, transparent 72%, rgba(55,243,221,.06));
      pointer-events:none;
      opacity:.65;
    }
    .glass-card:hover{
      border-color:var(--line-strong);
      box-shadow:0 20px 60px rgba(2,8,23,.52);
    }
    .section-kicker{
      display:inline-flex;
      align-items:center;
      gap:.5rem;
      padding:.45rem .85rem;
      border-radius:999px;
      border:1px solid rgba(125,228,255,.18);
      background:rgba(125,228,255,.08);
      color:#cdf8ff;
      font-size:.86rem;
      letter-spacing:.02em;
    }
    .section-note{
      color:var(--muted);
      max-width:62rem;
      font-size:1.02rem;
    }
    .brand-mark{
      display:inline-flex;
      align-items:center;
      gap:.72rem;
      font-weight:800;
      letter-spacing:-0.04em;
      color:#fff;
    }
    .brand-dot{
      width:1.08rem;
      height:1.08rem;
      border-radius:999px;
      background:
        radial-gradient(circle at 30% 30%, #fff 0 12%, var(--accent) 18%, rgba(55,243,221,.12) 70%, transparent 72%),
        linear-gradient(135deg, var(--accent2), var(--accent));
      box-shadow:0 0 0 6px rgba(55,243,221,.06), 0 0 22px rgba(55,243,221,.28);
      flex:0 0 auto;
    }
    .nav-shell{
      position:fixed;
      inset:16px 0 auto 0;
      z-index:50;
      pointer-events:none;
    }
    .nav-inner{
      width:min(var(--container), calc(100% - 1rem));
      margin:0 auto;
      pointer-events:auto;
    }
    .nav-pill{
      border-radius:999px;
      background:linear-gradient(180deg, rgba(18,26,53,.84), rgba(10,18,38,.66));
      border:1px solid rgba(146,188,255,.16);
      backdrop-filter:blur(18px);
      -webkit-backdrop-filter:blur(18px);
      box-shadow:0 12px 40px rgba(2,8,23,.36);
    }
    .nav-link{
      position:relative;
      padding:.72rem 1rem;
      color:#d7e5ff;
      border-radius:999px;
      font-size:.96rem;
      line-height:1;
      white-space:nowrap;
    }
    .nav-link:hover,
    .nav-link:focus-visible{
      background:rgba(125,228,255,.08);
      color:#fff;
      transform:translateY(-1px);
      outline:none;
    }
    .nav-link.active{
      background:linear-gradient(135deg, rgba(55,243,221,.15), rgba(111,140,255,.14));
      color:#fff;
      box-shadow: inset 0 0 0 1px rgba(55,243,221,.18);
    }
    .menu-btn{
      width:2.75rem;
      height:2.75rem;
      border-radius:999px;
      border:1px solid rgba(146,188,255,.16);
      background:rgba(255,255,255,.03);
      color:#eaf2ff;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      transition:all .22s ease;
    }
    .menu-btn:hover,
    .menu-btn:focus-visible{
      background:rgba(125,228,255,.09);
      box-shadow:0 0 0 3px rgba(55,243,221,.10);
      outline:none;
    }
    .mobile-drawer{
      display:none;
      margin-top:.75rem;
      border-radius:22px;
      padding:.9rem;
      border:1px solid rgba(146,188,255,.14);
      background:linear-gradient(180deg, rgba(14,22,44,.96), rgba(8,15,32,.92));
      box-shadow:var(--shadow-soft);
    }
    .mobile-drawer.open{display:block}
    .chip{
      display:inline-flex;
      align-items:center;
      gap:.45rem;
      padding:.48rem .78rem;
      border-radius:999px;
      border:1px solid rgba(125,228,255,.16);
      background:rgba(125,228,255,.06);
      color:#dff8ff;
      font-size:.88rem;
    }
    .chip:hover,
    .chip:focus-visible{
      background:rgba(55,243,221,.1);
      border-color:rgba(55,243,221,.22);
      transform:translateY(-1px);
      outline:none;
    }
    .btn-primary,
    .btn-secondary,
    .btn-ghost{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:.55rem;
      min-height:3.1rem;
      padding:.85rem 1.2rem;
      border-radius:999px;
      font-weight:700;
      letter-spacing:-0.01em;
      transition:all .22s ease;
      border:1px solid transparent;
      user-select:none;
      white-space:nowrap;
    }
    .btn-primary{
      color:#04111b;
      background:linear-gradient(135deg, var(--accent) 0%, #a8fff4 55%, #7de4ff 100%);
      box-shadow:0 12px 35px rgba(55,243,221,.24), 0 0 0 1px rgba(255,255,255,.1) inset;
    }
    .btn-primary:hover,
    .btn-primary:focus-visible{
      transform:translateY(-2px);
      box-shadow:0 14px 38px rgba(55,243,221,.30), 0 0 0 1px rgba(255,255,255,.14) inset;
      outline:none;
      color:#02101a;
    }
    .btn-primary:active{transform:translateY(0)}
    .btn-secondary{
      color:#eaf2ff;
      border-color:rgba(146,188,255,.18);
      background:rgba(255,255,255,.03);
      box-shadow: inset 0 0 0 1px rgba(255,255,255,.02);
    }
    .btn-secondary:hover,
    .btn-secondary:focus-visible{
      transform:translateY(-2px);
      border-color:rgba(125,228,255,.30);
      background:rgba(125,228,255,.08);
      outline:none;
      color:#fff;
    }
    .btn-secondary:active{transform:translateY(0)}
    .btn-ghost{
      color:#d7e5ff;
      border:1px solid rgba(146,188,255,.12);
      background:rgba(255,255,255,.02);
    }
    .btn-ghost:hover,
    .btn-ghost:focus-visible{
      transform:translateY(-2px);
      background:rgba(255,255,255,.05);
      border-color:rgba(125,228,255,.24);
      outline:none;
    }
    .badge{
      display:inline-flex;
      align-items:center;
      gap:.4rem;
      padding:.34rem .68rem;
      border-radius:999px;
      font-size:.78rem;
      font-weight:700;
      color:#dff8ff;
      border:1px solid rgba(55,243,221,.2);
      background:linear-gradient(135deg, rgba(55,243,221,.10), rgba(111,140,255,.10));
    }
    .tag{
      display:inline-flex;
      align-items:center;
      gap:.4rem;
      padding:.38rem .7rem;
      border-radius:999px;
      font-size:.82rem;
      color:#d4e4ff;
      border:1px solid rgba(146,188,255,.16);
      background:rgba(255,255,255,.03);
    }
    .meta-line{
      display:flex;
      flex-wrap:wrap;
      gap:.6rem;
      align-items:center;
    }
    .meta-chip{
      display:inline-flex;
      align-items:center;
      gap:.42rem;
      padding:.48rem .76rem;
      border-radius:999px;
      border:1px solid rgba(146,188,255,.14);
      background:rgba(255,255,255,.035);
      color:#dfe9ff;
      font-size:.88rem;
    }
    .meta-chip strong{color:#fff}
    .stat-card{
      border-radius:22px;
      border:1px solid rgba(125,228,255,.16);
      background:linear-gradient(180deg, rgba(13,23,48,.72), rgba(9,16,34,.56));
      padding:1rem 1.05rem;
      box-shadow:var(--shadow-soft);
    }
    .stat-value{
      font-size:1.55rem;
      line-height:1.1;
      font-weight:800;
      letter-spacing:-0.04em;
      color:#fff;
    }
    .stat-label{
      margin-top:.35rem;
      color:var(--muted);
      font-size:.88rem;
    }
    .article-topbar{
      display:flex;
      flex-wrap:wrap;
      gap:.7rem;
      align-items:center;
      justify-content:space-between;
    }
    .article-shell{
      display:grid;
      grid-template-columns: minmax(0, 1fr);
      gap:1.5rem;
    }
    .hero-frame{
      padding:1.2rem;
    }
    .avatar{
      width:4.2rem;
      height:4.2rem;
      border-radius:28px;
      display:grid;
      place-items:center;
      font-weight:800;
      letter-spacing:-.05em;
      color:#02101a;
      background:linear-gradient(135deg, #7de4ff 0%, #a9fff3 52%, #6f8cff 100%);
      box-shadow:0 14px 34px rgba(55,243,221,.24), inset 0 0 0 1px rgba(255,255,255,.38);
      flex:0 0 auto;
    }
    .cover-grid{
      display:grid;
      grid-template-columns:1.2fr .8fr;
      gap:1rem;
      align-items:stretch;
    }
    .cover-mini{
      border-radius:20px;
      border:1px solid rgba(125,228,255,.14);
      background:linear-gradient(180deg, rgba(10,18,38,.82), rgba(11,17,35,.52));
      padding:1rem;
      min-height:100%;
    }
    .cover-mini .line{
      height:1px;
      background:linear-gradient(90deg, rgba(125,228,255,.24), transparent);
      margin:1rem 0;
    }
    .article-content{
      color:#eaf2ff;
      font-size:1.03rem;
    }
    .article-content h2,
    .article-content h3,
    .article-content h4{
      scroll-margin-top:110px;
      letter-spacing:-0.03em;
      line-height:1.18;
      color:#fff;
      margin-top:1.7em;
      margin-bottom:.72em;
    }
    .article-content h2{font-size:1.55rem;font-weight:800}
    .article-content h3{font-size:1.2rem;font-weight:700}
    .article-content p{
      margin:0 0 1.05rem;
      color:#eaf2ff;
    }
    .article-content p + p{margin-top:.1rem}
    .article-content ul,
    .article-content ol{
      margin:0 0 1.1rem 1.25rem;
      padding:0;
      color:#d8e5ff;
    }
    .article-content li{margin:.35rem 0}
    .article-content blockquote{
      margin:1.35rem 0;
      padding:1rem 1.1rem;
      border-left:3px solid var(--accent);
      border-radius:16px;
      background:rgba(55,243,221,.06);
      color:#e8fbff;
    }
    .article-content code{
      padding:.18rem .36rem;
      border-radius:8px;
      border:1px solid rgba(146,188,255,.16);
      background:rgba(255,255,255,.04);
      color:#aefcff;
      font-size:.92em;
    }
    .article-content pre{
      overflow:auto;
      padding:1rem 1.05rem;
      border-radius:18px;
      border:1px solid rgba(146,188,255,.14);
      background:rgba(5,10,24,.82);
      box-shadow:inset 0 0 0 1px rgba(255,255,255,.02);
      color:#dff4ff;
      margin:1.2rem 0;
    }
    .article-content pre code{
      border:0;
      background:transparent;
      padding:0;
      color:inherit;
    }
    .article-content table{
      width:100%;
      border-collapse:collapse;
      margin:1.25rem 0;
      overflow:hidden;
      border-radius:18px;
      border:1px solid rgba(146,188,255,.14);
      background:rgba(255,255,255,.03);
    }
    .article-content th,
    .article-content td{
      padding:.9rem 1rem;
      border-bottom:1px solid rgba(146,188,255,.10);
      text-align:left;
      vertical-align:top;
      color:#eaf2ff;
    }
    .article-content th{
      background:rgba(125,228,255,.06);
      color:#fff;
      font-weight:700;
    }
    .article-content hr{
      border:0;
      height:1px;
      margin:1.4rem 0;
      background:linear-gradient(90deg, transparent, rgba(125,228,255,.34), transparent);
    }
    .article-content img{
      border-radius:20px;
      border:1px solid rgba(125,228,255,.16);
      box-shadow:var(--shadow-soft);
      margin:1.2rem 0;
    }
    .article-content a{
      color:#8ef8ef;
      text-decoration:underline;
      text-decoration-color:rgba(142,248,239,.4);
      text-underline-offset:3px;
    }
    .article-content a:hover{color:#fff;text-decoration-color:#fff}
    .toc-card{
      position:sticky;
      top:108px;
    }
    .toc-link{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:.8rem;
      padding:.78rem .85rem;
      border-radius:16px;
      border:1px solid rgba(146,188,255,.10);
      background:rgba(255,255,255,.02);
      color:#d8e5ff;
    }
    .toc-link:hover,
    .toc-link:focus-visible{
      background:rgba(125,228,255,.08);
      border-color:rgba(125,228,255,.22);
      transform:translateY(-1px);
      color:#fff;
      outline:none;
    }
    .related-card{
      display:flex;
      gap:.9rem;
      align-items:flex-start;
      padding:1rem 1rem;
      border-radius:20px;
      border:1px solid rgba(146,188,255,.12);
      background:rgba(255,255,255,.03);
      transition:all .22s ease;
    }
    .related-card:hover{
      transform:translateY(-2px);
      border-color:rgba(125,228,255,.24);
      box-shadow:0 16px 34px rgba(2,8,23,.24);
    }
    .related-card .icon{
      width:2.6rem;
      height:2.6rem;
      border-radius:16px;
      flex:0 0 auto;
      display:grid;
      place-items:center;
      color:#04111b;
      background:linear-gradient(135deg, #7de4ff 0%, #a9fff3 55%, #6f8cff 100%);
      box-shadow:0 12px 24px rgba(55,243,221,.22);
    }
    .faq-item{
      border-radius:20px;
      border:1px solid rgba(146,188,255,.12);
      background:rgba(255,255,255,.03);
      overflow:hidden;
    }
    .faq-trigger{
      width:100%;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:1rem;
      padding:1rem 1.05rem;
      color:#fff;
      background:transparent;
      border:0;
      text-align:left;
      font-weight:700;
    }
    .faq-trigger:hover,
    .faq-trigger:focus-visible{
      background:rgba(125,228,255,.05);
      outline:none;
    }
    .faq-panel{
      display:none;
      padding:0 1.05rem 1rem;
      color:#d8e5ff;
    }
    .faq-item.open .faq-panel{display:block}
    .faq-item.open .faq-arrow{transform:rotate(180deg)}
    .faq-arrow{
      transition:transform .2s ease;
      flex:0 0 auto;
      color:#8ef8ef;
    }
    .footer-link{
      color:#b9caea;
      display:inline-flex;
      width:fit-content;
      padding:.16rem 0;
    }
    .footer-link:hover,
    .footer-link:focus-visible{
      color:#fff;
      transform:translateX(2px);
      outline:none;
    }
    .footer-shell{
      position:relative;
      z-index:1;
    }
    .muted-text{color:var(--muted)}
    .prose-soft{
      color:#dbe8ff;
    }

    @media (max-width: 1023px){
      body{padding-top:84px}
      .toc-card{position:relative;top:auto}
      .cover-grid{grid-template-columns:1fr}
    }
    @media (max-width: 767px){
      .nav-shell{inset:12px 0 auto 0}
      .section-block{padding:3rem 0}
      .article-content{font-size:1rem}
      .hero-frame{padding:1rem}
    }
    @media (max-width: 639px){
      .container-site{width:min(var(--container), calc(100% - 1rem))}
      .nav-link{padding:.64rem .82rem;font-size:.92rem}
      .btn-primary,
      .btn-secondary,
      .btn-ghost{width:100%}
    }