:root{
      --bg: #0f1226;
      --panel: #1c2145;
      --panel-2: #242a5c;
      --text: #e7e9ff;
      --muted: #b8bced;
      --accent: #8aa1ff;
      --accent-2: #ffd166;
      --border: #2a3066;
      --success: #67e8a3;
      --danger: #ff7a7a;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
      background: radial-gradient(1200px 600px at 20% -10%, #2a2f61 0%, rgba(15,18,38,0) 60%),
                  radial-gradient(1000px 500px at 120% 10%, #3a2f7a 0%, rgba(15,18,38,0) 55%),
                  var(--bg);
      color:var(--text);
    }

    /* Layout */
    .layout{display:grid; grid-template-columns: 280px 1fr; gap:0; min-height:100vh}
    aside{
      position:sticky; top:0; align-self:start; height:100vh; overflow:auto;
      background:linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
      border-right:1px solid var(--border);
      padding:24px 18px;
    }
    main{padding:32px; max-width:980px}

    /* Sidebar */
    .brand{display:flex; align-items:center; gap:12px; margin-bottom:18px}
    .brand-logo{
      width:40px; height:40px; display:grid; place-items:center;
      background:linear-gradient(145deg,#2e356d,#1b1f42); border:1px solid var(--border);
      box-shadow: 0 6px 18px rgba(0,0,0,.35);
      font-weight:900; color:var(--accent-2)
    }
    .brand h1{font-size:16px; margin:0}

    nav{display:flex; flex-direction:column; gap:6px; margin-top:8px}
    .nav-title{font-size:12px; text-transform:uppercase; letter-spacing:.08em; color:var(--muted); margin:16px 8px 6px}
    .nav a{
      display:block; padding:10px 12px; border-radius:10px; color:var(--text); text-decoration:none; font-size:14px;
      border:1px solid transparent;
    }
    .nav a:hover{background:rgba(255,255,255,.04); border-color:var(--border)}
    .nav a.active{background:rgba(138,161,255,.12); border-color:rgba(138,161,255,.45)}

    /* Content */
    h2{margin:0 0 10px; font-size:28px}
    h3{margin:24px 0 8px; font-size:20px}
    p{line-height:1.6; color:#dfe3ff}
    .muted{color:var(--muted)}

    .card{
      background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.01));
      border:1px solid var(--border); border-radius:16px; padding:18px; margin:16px 0; box-shadow: 0 10px 30px rgba(0,0,0,.25);
    }
    .callout{display:flex; gap:12px; align-items:flex-start; border-left:4px solid var(--accent); padding:12px 14px; border-radius:10px; background:rgba(138,161,255,.08)}
    .kbd{font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; background:#0c0f24; border:1px solid var(--border); padding:2px 6px; border-radius:6px}
    .pill{display:inline-block; padding:4px 8px; border-radius:999px; border:1px solid var(--border); background:rgba(255,255,255,.04); font-size:12px; color:var(--muted)}

    .grid{display:grid; gap:18px}
    .grid.cols-2{grid-template-columns:1fr 1fr}

    .img-frame{border:1px dashed var(--border); border-radius:14px; overflow:hidden; background:#0c0f24; aspect-ratio: 16/7; display:grid; place-items:center; color:var(--muted)}
    .legend{font-size:13px; color:var(--muted); margin-top:6px}

    .footer{margin:40px 0 20px; font-size:13px; color:var(--muted)}

    /* Responsive */
    @media (max-width: 980px){
      .layout{grid-template-columns: 1fr}
      aside{position:static; height:auto}
      main{padding:22px}
    }