:root {
      --bg: #0b0e14;
      --panel: rgba(255,255,255,0.06);
      --panel-strong: rgba(255,255,255,0.12);
      --text: #e6e6e6;
      --muted: #9aa4b2;
      --accent: #8b5cf6; /* violet */
      --accent-2: #22d3ee; /* cyan */
      --danger: #ef4444;
      --ok: #10b981;
      --shadow: 0 10px 30px rgba(0,0,0,0.45);
      --radius: 16px;
    }
    * { box-sizing: border-box; }
    html, body { height: 100%; }
    body {
      margin: 0; background: var(--bg); color: var(--text);
      font: 14px/1.35 Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
      overflow: hidden;
    }
    #three-container { position: absolute; inset: 0; }
    .topbar {
      position: fixed; top: 16px; left: 50%; transform: translateX(-50%);
      display: flex; gap: 8px; align-items: center;
      background: var(--panel);
      backdrop-filter: blur(10px);
      border: 1px solid var(--panel-strong);
      border-radius: var(--radius);
      padding: 8px 10px;
      box-shadow: var(--shadow);
      z-index: 30;
    }
    .topbar .btn {
      border: 1px solid var(--panel-strong);
      background: transparent; color: var(--text);
      padding: 8px 12px; border-radius: 12px; cursor: pointer;
      transition: transform .05s ease, background .2s ease, border-color .2s ease;
    }
    .topbar .btn:hover { background: rgba(255,255,255,0.08); }
    .topbar .btn:active { transform: translateY(1px); }
    .topbar .btn.primary { border-color: var(--accent); }
    .topbar .btn.ok { border-color: var(--ok); }
    .sidebar {
      position: fixed; right: 16px; top: 16px; bottom: 16px; width: 340px;
      background: var(--panel);
      border: 1px solid var(--panel-strong);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 14px 14px 90px;
      transform: translateX(0);
      transition: transform .25s ease;
      display: grid; grid-template-rows: auto 1fr auto;
      backdrop-filter: blur(10px);
      z-index: 40;
    }
    .sidebar.hidden { transform: translateX(360px); }
    .sidebar .head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
    .sidebar .title { font-weight: 650; letter-spacing: .2px; }
    .sidebar .muted { color: var(--muted); font-size: 12px; }
    .sections { overflow: auto; padding-right: 4px; }
    .section { border: 1px solid var(--panel-strong); border-radius: 14px; margin: 10px 0; }
    .section summary { list-style: none; cursor: pointer; padding: 10px 12px; font-weight: 600; }
    .section[open] summary { border-bottom: 1px dashed var(--panel-strong); }
    .section .body { padding: 10px 12px 12px; display: grid; gap: 10px; }
    .row { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 10px; }
    .row label { font-size: 12px; color: var(--muted); }
    .row input[type="number"],
    .row input[type="range"],
    .row select {
      width: 140px; border: 1px solid var(--panel-strong);
      background: rgba(0,0,0,0.25); color: var(--text);
      border-radius: 10px; padding: 6px 8px;
    }
    input[type="range"] { height: 28px; }
    .grid {
      display: grid; gap: 4px;
    }
    .grid .cell {
      height: 32px; width: 40px; display: grid; place-items: center;
      background: rgba(255,255,255,0.06); border: 1px solid var(--panel-strong);
      border-radius: 6px; user-select: none; cursor: pointer; font-weight: 600;
    }
    .grid .hdr { color: #000; font-weight: 700; }
    .footer {
      position: absolute; left: 14px; right: 14px; bottom: 14px;
      display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
    }
    .footer .btn { padding: 10px 12px; border-radius: 12px; border: 1px solid var(--panel-strong); background: rgba(255,255,255,0.03); color: var(--text); cursor: pointer; }
    .footer .btn.danger { border-color: var(--danger); color: #ffd9d9; }
    .burger {
      position: fixed; right: 16px; top: 16px; z-index: 50;
      width: 42px; height: 42px; border-radius: 50%;
      display: grid; place-items: center; cursor: pointer;
      background: var(--panel); border: 1px solid var(--panel-strong);
      box-shadow: var(--shadow);
    }
    .burger div { width: 18px; height: 2px; background: var(--text); margin: 2px 0; }
    .badge { font-size: 11px; color: var(--muted); }