:root {
      --bg: #0a0b0f;
      --panel: #10131a;
      --accent: #7c5cff;
      --accent-2: #2ee6a6;
      --text: #e6e7ee;
      --muted: #9aa0a6;
      --danger: #ff5c7c;
      --layer-bg: rgba(255,255,255,.05);
      --footer-glow: #7c5cff;
    }
    html, body {
      height: 100%;
      margin: 0;
      background: radial-gradient(1200px 800px at 70% -20%, rgba(124,92,255,.24), transparent 60%),
                  radial-gradient(1000px 700px at 0% 100%, rgba(46,230,166,.18), transparent 60%),
                  var(--bg);
      color: var(--text);
      font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
      overflow: hidden;
    }
    .app {
      display: grid;
      grid-template-rows: auto 1fr auto auto;
      height: 100%;
    }
    .topbar {
      display: flex;
      gap: .5rem;
      align-items: center;
      padding: .5rem .75rem;
      background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(0,0,0,.1));
      border-bottom: 1px solid rgba(255,255,255,.06);
      box-shadow: 0 10px 40px rgba(0,0,0,.35);
      backdrop-filter: blur(6px);
      position: relative;
      z-index: 10;
      flex-wrap: wrap;
    }
    .brand {
      font-weight: 700;
      letter-spacing: .3px;
      font-size: 1rem;
      opacity: .95;
      display: flex;
      align-items: center;
      gap: .5rem;
    }
    .glow-dot {
      width: 8px; height: 8px; border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 10px var(--accent), 0 0 20px var(--accent);
    }
    .toolbar {
      display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; margin-left: auto;
    }
    .btn {
      appearance: none; border: 1px solid rgba(255,255,255,.09); color: var(--text);
      background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(0,0,0,.25));
      padding: .4rem .6rem; border-radius: 10px; cursor: pointer; font-weight: 600;
      box-shadow: inset 0 0 0 1px rgba(255,255,255,.03), 0 6px 16px rgba(0,0,0,.25);
      transition: transform .08s ease, box-shadow .2s ease, border-color .2s ease;
      user-select: none; position: relative;
      font-size: .9rem;
    }
    .btn:hover { border-color: rgba(255,255,255,.18); }
    .btn:active { transform: translateY(1px) scale(.99); }
    .btn.primary {
      border-color: rgba(124,92,255,.5);
      box-shadow: 0 0 20px rgba(124,92,255,.25), inset 0 0 0 1px rgba(124,92,255,.22);
      text-shadow: 0 0 12px rgba(124,92,255,.6);
    }
    .btn.danger { border-color: rgba(255,92,124,.45); }
    .btn.active { outline: 2px solid var(--accent-2); text-shadow: 0 0 10px var(--accent-2); }
    .sep { width: 1px; height: 24px; background: rgba(255,255,255,.08); margin: 0 .2rem; }
    .control {
      display: inline-flex; align-items: center; gap: .4rem; padding: .3rem .5rem; border-radius: 10px;
      background: rgba(255,255,255,.03); border: 1px solid rgba(255,255,255,.08);
    }
    .control select, .control input[type="color"], .control input[type="range"] {
      border: none; background: transparent; color: var(--text); cursor: pointer;
    }
    .control input[type="color"] {
      width: 28px; height: 24px; padding: 0; border-radius: 6px; overflow: hidden;
    }
    .control input[type="range"] { width: 100px; }
    .control select { padding: .2rem; border-radius: 6px; }
    .label { font-size: .8rem; color: var(--muted); }
    .tooltip {
      position: absolute; top: 100%; left: 50%; transform: translateX(-50%); margin-top: 6px;
      background: var(--panel); color: var(--text); padding: .4rem .6rem; border-radius: 6px;
      font-size: .75rem; white-space: nowrap; opacity: 0; visibility: hidden;
      transition: opacity .2s ease, visibility .2s ease; z-index: 20;
      border: 1px solid rgba(255,255,255,.1);
    }
    .btn:hover .tooltip, .control:hover .tooltip { opacity: 1; visibility: visible; }
    .board-wrap { position: relative; overflow: hidden; }
    canvas { display: block; width: 100vw; height: calc(100vh - 140px); background: transparent; cursor: crosshair; touch-action: none; }
    .statusbar {
      display: flex; align-items: center; justify-content: space-between; gap: .4rem;
      padding: .4rem .6rem; font-size: .8rem; color: var(--muted);
      background: linear-gradient(0deg, rgba(255,255,255,.02), rgba(0,0,0,.15));
      border-top: 1px solid rgba(255,255,255,.06);
      flex-wrap: wrap;
    }
    .badge { padding: .2rem .4rem; border-radius: 999px; background: rgba(124,92,255,.12); color: #d9d1ff; border: 1px solid rgba(124,92,255,.35); }
    .layer-panel {
      position: absolute; top: 70px; right: 10px; width: 180px; background: var(--layer-bg);
      border: 1px solid rgba(255,255,255,.1); border-radius: 10px; padding: .4rem;
      box-shadow: 0 4px 20px rgba(0,0,0,.3); backdrop-filter: blur(6px); z-index: 5;
    }
    .layer-item {
      display: flex; align-items: center; gap: .4rem; padding: .3rem; border-radius: 6px;
      background: rgba(255,255,255,.03); margin-bottom: .2rem; cursor: pointer;
    }
    .layer-item.active { background: rgba(124,92,255,.15); border: 1px solid var(--accent); }
    .layer-item input[type="checkbox"] { margin: 0; }
    .layer-item span { flex: 1; font-size: .8rem; }
    .footer {
      text-align: center;
      padding: .5rem;
      font-size: .8rem;
      color: var(--text);
      background: linear-gradient(0deg, rgba(255,255,255,.02), rgba(0,0,0,.15));
      border-top: 1px solid rgba(255,255,255,.06);
      text-shadow: 0 0 10px var(--footer-glow), 0 0 20px var(--footer-glow);
      animation: neonGlow 1.5s ease-in-out infinite alternate;
    }
    .modal {
      position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
      background: var(--panel); color: var(--text); padding: 1rem; border-radius: 12px;
      box-shadow: 0 0 20px rgba(124,92,255,.5), inset 0 0 0 1px rgba(124,92,255,.22);
      z-index: 100; display: none; flex-direction: column; gap: .5rem;
      border: 1px solid rgba(255,255,255,.1); backdrop-filter: blur(6px);
      max-width: 300px; width: 90%;
    }
    .modal.show { display: flex; }
    .modal p { margin: 0; font-size: .9rem; text-align: center; }
    .modal-buttons { display: flex; justify-content: center; gap: .5rem; }
    @keyframes neonGlow {
      from { text-shadow: 0 0 5px var(--footer-glow), 0 0 10px var(--footer-glow); }
      to { text-shadow: 0 0 10px var(--footer-glow), 0 0 20px var(--footer-glow); }
    }
    @media (max-width: 768px) {
      .topbar { padding: .4rem .6rem; gap: .4rem; }
      .brand { font-size: .9rem; }
      .btn { padding: .3rem .5rem; font-size: .85rem; }
      .control input[type="range"] { width: 80px; }
      .control input[type="color"] { width: 24px; height: 20px; }
      .control { padding: .25rem .4rem; gap: .3rem; }
      .sep { height: 20px; }
      .layer-panel { width: 140px; top: 60px; right: 8px; }
      .layer-item { padding: .25rem; }
      .layer-item span { font-size: .75rem; }
      .statusbar { font-size: .75rem; flex-direction: column; align-items: flex-start; }
      canvas { height: calc(100vh - 160px); }
      .footer { font-size: .75rem; }
      .modal { max-width: 250px; }
      .modal p { font-size: .85rem; }
    }
    @media (max-width: 480px) {
      .brand { display: none; }
      .toolbar { margin-left: 0; justify-content: center; }
      .btn { padding: .25rem .4rem; font-size: .8rem; }
      .control input[type="range"] { width: 60px; }
      .control input[type="color"] { width: 20px; height: 18px; }
      .control { padding: .2rem .3rem; }
      .sep { display: none; }
      .layer-panel { width: 120px; top: 50px; }
      .statusbar { font-size: .7rem; }
      canvas { height: calc(100vh - 180px); }
      .tooltip { font-size: .7rem; }
      .modal { max-width: 200px; }
      .modal p { font-size: .8rem; }
    }