:root{
      --bg:#f6f8ff;
      --text:rgba(15,23,42,.92);
      --muted:rgba(15,23,42,.65);
      --border:rgba(15,23,42,.12);
      --shadow:0 18px 45px rgba(2,6,23,.10);
      --shadow2:0 10px 22px rgba(2,6,23,.08);
      --radius:18px;
      --maxw:1200px;

      --a1:#7c3aed;
      --a2:#06b6d4;
      --a3:#f97316;

      --topbarH:74px;
    }

    *{box-sizing:border-box}
    html,body{height:100%}
    body{
      margin:0;
      font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;
      background:
        radial-gradient(900px 500px at 15% -10%, rgba(124,58,237,.14), transparent 60%),
        radial-gradient(900px 500px at 85% -20%, rgba(6,182,212,.12), transparent 55%),
        linear-gradient(180deg, var(--bg), #ffffff 55%, var(--bg) 120%);
      color:var(--text);
      line-height:1.55;
    }

    a{color:inherit;text-decoration:none}
    .container{width:min(var(--maxw),calc(100% - 32px));margin:auto}

    /* ===== TOP HEADER ===== */
    .topbar{
      position:sticky;top:0;z-index:60;
      background:rgba(255,255,255,.72);
      border-bottom:1px solid var(--border);
      backdrop-filter:blur(12px);
    }
    .topbar-row{
      height:var(--topbarH);
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:14px;
    }

    .brand{display:flex;align-items:center;gap:12px;min-width:220px}
    .brand-logo{
      width:46px;height:46px;border-radius:14px;
      border:1px solid rgba(15,23,42,.14);
      background: linear-gradient(135deg, rgba(124,58,237,.10), rgba(6,182,212,.10));
      box-shadow: var(--shadow2);
      display:grid;place-items:center;overflow:hidden;flex:0 0 auto;
    }
    .brand-logo img{width:100%;height:100%;object-fit:contain;display:block}
    .brand-text{display:flex;flex-direction:column;line-height:1.08}
    .brand-text strong{font-size:14.8px;letter-spacing:.2px}
    .brand-text span{font-size:12px;color:var(--muted)}

    .menu-btn{
      width:46px;height:46px;border-radius:14px;
      border:1px solid rgba(15,23,42,.14);
      background:rgba(255,255,255,.92);
      box-shadow: var(--shadow2);
      cursor:pointer;
      display:flex;align-items:center;justify-content:center;
      padding:0;
    }
    .menu-btn svg{width:20px;height:20px}

    /* ===== DESKTOP MENU BAR ===== */
    nav.menu-bar{
      background: rgba(255,255,255,.82);
      border-bottom:1px solid var(--border);
      backdrop-filter: blur(10px);
    }
    .menu-row{
      display:flex;
      justify-content:center;
      gap:6px;
      padding:12px 0;
      flex-wrap:wrap;
    }
    .menu-row a{
      padding:10px 12px;
      border-radius:14px;
      font-weight:800;
      font-size:13.2px;
      color: rgba(15,23,42,.86);
      border:1px solid transparent;
      transition: transform .12s ease, background .12s ease, border-color .12s ease;
      white-space:nowrap;
    }
    .menu-row a:hover{
      transform: translateY(-1px);
      background: rgba(124,58,237,.08);
      border-color: rgba(124,58,237,.18);
    }
    .menu-row a[aria-current="page"]{
      background: linear-gradient(135deg, rgba(124,58,237,.14), rgba(6,182,212,.12));
      border-color: rgba(15,23,42,.14);
    }

    /* ===== MOBILE DRAWER ===== */
    #mobileMenu{
      background: rgba(255,255,255,.92);
      border-bottom:1px solid var(--border);
    }
    .drawer-inner{
      padding:12px 0 16px;
      display:grid;
      gap:8px;
    }
    .drawer-inner a{
      display:flex;
      align-items:center;
      justify-content:space-between;
      padding:12px 14px;
      font-weight:900;
      border-radius:16px;
      border:1px solid rgba(15,23,42,.12);
      background: rgba(255,255,255,.92);
      box-shadow: 0 10px 22px rgba(2,6,23,.06);
    }
    .drawer-inner a span.chev{opacity:.6}

    /* ✅ hide desktop menu bar on mobile ALWAYS */
    @media (max-width: 980px){
      nav.menu-bar{ display:none !important; }
    }

    /* Desktop: hide hamburger + mobile drawer */
    @media (min-width: 981px){
      .menu-btn{ display:none; }
      #mobileMenu{ display:none !important; }
      nav.menu-bar{ display:block; }
    }

    /* ===== MAIN ===== */
    main{padding:26px 0 34px}

    .page-shell{
      background:rgba(255,255,255,.84);
      border-radius:22px;
      border:1px solid var(--border);
      padding:22px;
      box-shadow: var(--shadow);
      overflow:hidden;
    }

    /* Content typography */
    .hero{
      display:grid;
      grid-template-columns: 1.2fr .8fr;
      gap:18px;
      align-items:start;
      margin-bottom:18px;
    }

    .kicker{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 12px;
      border-radius:999px;
      border:1px solid rgba(15,23,42,.12);
      background: rgba(255,255,255,.85);
      font-weight:900;
      font-size:12.5px;
      color: rgba(15,23,42,.82);
      box-shadow: 0 10px 22px rgba(2,6,23,.05);
    }
    .dot{
      width:10px;height:10px;border-radius:999px;
      background: linear-gradient(135deg, var(--a1), var(--a2), var(--a3));
      box-shadow: 0 10px 20px rgba(124,58,237,.20);
    }

    h1{
      margin:12px 0 8px;
      font-size: clamp(24px, 3.2vw, 36px);
      letter-spacing:-.3px;
      line-height:1.12;
    }
    .lead{
      margin:0;
      color: var(--muted);
      font-size: 14.8px;
      max-width: 72ch;
    }

    .hero-card{
      border:1px solid rgba(15,23,42,.12);
      border-radius:20px;
      background: rgba(255,255,255,.92);
      box-shadow: 0 18px 42px rgba(2,6,23,.06);
      overflow:hidden;
    }
    .hero-card .img-wrap{
      aspect-ratio: 16/10;
      background:
        radial-gradient(700px 240px at 20% 0%, rgba(124,58,237,.10), transparent 60%),
        radial-gradient(700px 240px at 80% 0%, rgba(6,182,212,.10), transparent 60%),
        rgba(255,255,255,.85);
      display:block;
    }
    .hero-card img{
      width:100%;
      height:100%;
      object-fit:contain;
      display:block;
    }
    .hero-card .cap{
      padding:12px 14px;
      border-top:1px solid rgba(15,23,42,.10);
      color: var(--muted);
      font-size: 12.8px;
    }
    .hero-card .cap b{color: rgba(15,23,42,.86)}

    .grid{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap:14px;
      margin-top:14px;
    }
    .card{
      border:1px solid rgba(15,23,42,.12);
      border-radius:20px;
      background: rgba(255,255,255,.92);
      box-shadow: 0 18px 42px rgba(2,6,23,.06);
      padding:14px;
    }
    .card h2{
      margin:0 0 8px;
      font-size:16px;
      letter-spacing:-.2px;
    }
    .card p{margin:0;color:var(--muted);font-size:13.8px}

    .toc{
      margin-top:14px;
      display:flex;
      flex-wrap:wrap;
      gap:8px;
    }
    .pill{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:9px 12px;
      border-radius:999px;
      border:1px solid rgba(15,23,42,.12);
      background: rgba(255,255,255,.92);
      font-weight:900;
      font-size:12.6px;
      box-shadow: 0 10px 22px rgba(2,6,23,.05);
      transition: transform .12s ease, border-color .12s ease, background .12s ease;
    }
    .pill:hover{
      transform: translateY(-1px);
      background: rgba(124,58,237,.06);
      border-color: rgba(124,58,237,.20);
    }

    .section{
      margin-top:18px;
      padding-top:18px;
      border-top:1px solid rgba(15,23,42,.10);
    }
    .section h2{
      margin:0 0 8px;
      font-size:20px;
      letter-spacing:-.2px;
    }
    .section .sub{
      margin:0 0 14px;
      color:var(--muted);
      font-size:14px;
      max-width: 80ch;
    }

    .cols{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap:14px;
    }
    .list{
      margin:0;
      padding:0;
      list-style:none;
      display:grid;
      gap:10px;
    }
    .li{
      border:1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.92);
      border-radius:18px;
      padding:12px 12px;
      box-shadow: 0 12px 26px rgba(2,6,23,.05);
    }
    .li b{
      display:block;
      font-size:13.8px;
      margin-bottom:4px;
      letter-spacing:-.1px;
    }
    .li span{
      display:block;
      color:var(--muted);
      font-size:13.2px;
    }

    .note{
      margin-top:14px;
      border:1px solid rgba(6,182,212,.22);
      background: linear-gradient(135deg, rgba(6,182,212,.10), rgba(124,58,237,.08));
      border-radius:18px;
      padding:12px 14px;
      color: rgba(15,23,42,.86);
      box-shadow: 0 18px 40px rgba(2,6,23,.05);
    }
    .note b{display:block;margin-bottom:6px}
    .note p{margin:0;color:rgba(15,23,42,.78);font-size:13.6px}

    /* Responsive */
    @media (max-width: 980px){
      .hero{grid-template-columns: 1fr; }
      .grid{grid-template-columns: 1fr;}
      .cols{grid-template-columns: 1fr;}
    }
    @media(max-width:520px){
      .topbar-row{height:68px}
      main{padding:18px 0 26px}
      .page-shell{padding:16px}
    }

    /* ===== FOOTER ===== */
    footer{
      margin-top:34px;
      border-top:1px solid var(--border);
      background:
        radial-gradient(800px 320px at 20% 0%, rgba(124,58,237,.10), transparent 60%),
        radial-gradient(800px 320px at 80% 0%, rgba(6,182,212,.10), transparent 60%),
        rgba(255,255,255,.88);
      backdrop-filter: blur(10px);
    }

    .footer-inner{padding:22px 0;display:grid;gap:14px}
    .footer-top{
      display:flex;align-items:flex-start;justify-content:space-between;
      gap:14px;flex-wrap:wrap;
    }

    .footer-title{font-weight:1000;font-size:13px;letter-spacing:.2px;margin:0}
    .footer-sub{
      margin:6px 0 0;
      font-size:12.6px;
      color:var(--muted);
      max-width:760px;
    }

    .footer-links{
      display:flex;gap:10px;flex-wrap:wrap;
      justify-content:flex-end;align-items:center;
    }
    .footer-links a{
      padding:9px 12px;border-radius:999px;
      border:1px solid rgba(15,23,42,.12);
      background: rgba(255,255,255,.86);
      font-weight:900;font-size:12.5px;
      box-shadow: 0 10px 22px rgba(2,6,23,.05);
      transition: transform .12s ease, background .12s ease, border-color .12s ease;
    }
    .footer-links a:hover{
      transform: translateY(-1px);
      background: rgba(6,182,212,.08);
      border-color: rgba(6,182,212,.28);
    }

    .footer-bottom{
      display:flex;align-items:center;justify-content:space-between;
      gap:10px;flex-wrap:wrap;padding-top:10px;
      border-top:1px solid rgba(15,23,42,.10);
    }
    .copyright{font-size:12px;color:var(--muted)}

    @media(max-width:520px){
      .footer-links{justify-content:flex-start}
      .footer-bottom{flex-direction:column;align-items:flex-start}
    }