:root{
    /* tokens */
    --bg: #010a4f;
    --panel: rgba(255,255,255,0.06);
    --panel-2: rgba(255,255,255,0.10);
    --text: rgba(255,255,255,0.92);
    --muted: rgba(255,255,255,0.68);
    --border: rgba(255,255,255,0.14);
    --shadow: 0 16px 48px rgba(0,0,0,0.45);

    --r-lg: 18px;
    --r-md: 14px;

    --pad-lg: 18px;
    --pad-md: 14px;

    --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    /* semantic accents */
    --primary: #3b82f6;
    --danger: #ef4444;
    --ok: #22c55e;
    --warn: #f59e0b;
  }

  *{ box-sizing: border-box; }
  html, body { height: 100%; }
  body{
    margin: 0;
    font-family: var(--font);
    background: radial-gradient(1200px 600px at 30% 10%, rgba(59,130,246,0.22), transparent 60%),
                radial-gradient(900px 700px at 80% 30%, rgba(245,158,11,0.10), transparent 65%),
                var(--bg);
    color: var(--text);
  }

  h1,h2{ margin: 0; }
  h1{ font-size: 18px; letter-spacing: 0.2px; }
  h2{ font-size: 16px; letter-spacing: 0.2px; }

  .muted{ color: var(--muted); }
  .mono{ font-family: var(--mono); }

  .app{
    max-width: 1400px;
    margin: 0 auto;
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .topbar{
    display: flex;
    gap: 12px;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    border: 1px solid var(--border);
    background: var(--panel);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow);
  }

  .topbar__title p{ margin: 6px 0 0; font-size: 13px; }
  .topbar__actions{ display: flex; gap: 10px; }

  .card{
    border: 1px solid var(--border);
    background: var(--panel);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow);
  }

  .controls{
    padding: var(--pad-lg);
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .controls__row{
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
    align-items: end;
  }
  .controls__row--stats{
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: center;
  }

  .control{ display: flex; flex-direction: column; gap: 8px; }
  .control__label{ font-size: 12px; color: var(--muted); }
  .control--inline{ align-self: center; }

  .input{
    height: 38px;
    border-radius: var(--r-md);
    border: 1px solid var(--border);
    background: rgba(0,0,0,0.22);
    color: var(--text);
    padding: 0 10px;
    outline: none;
  }
  input[type="range"]{ width: 100%; }

  .checkbox{
    display: flex;
    gap: 10px;
    align-items: center;
    font-size: 13px;
    color: var(--muted);
  }

  .btn{
    height: 38px;
    padding: 0 14px;
    border-radius: var(--r-md);
    border: 1px solid var(--border);
    background: rgba(255,255,255,0.08);
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
  }
  .btn:hover{ background: rgba(255,255,255,0.12); }
  .btn--primary{ background: rgba(59,130,246,0.22); border-color: rgba(59,130,246,0.35); }
  .btn--danger{ background: rgba(239,68,68,0.20); border-color: rgba(239,68,68,0.35); }

  .stat{
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--r-md);
    border: 1px solid rgba(255,255,255,0.10);
    background: rgba(0,0,0,0.18);
  }
  .stat__k{ color: var(--muted); font-size: 12px; }
  .stat__v{ font-size: 12px; }

  .main{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .panel{
    padding: var(--pad-lg);
    display: flex;
    flex-direction: column;
  }
  .panel__header{ margin-bottom: 12px; }
  .panel__header p{ margin: 6px 0 0; font-size: 13px; }

  canvas{
    width: 100%;
    aspect-ratio: 1;
    display: block;
    border-radius: var(--r-md);
    border: 1px solid rgba(255,255,255,0.12);
    background: rgba(0,0,0,0.22);
  }

  .footer{
    text-align: center;
    font-size: 12px;
    padding: 8px;
  }

  @media (max-width: 1100px){
    .controls__row{ grid-template-columns: 1fr 1fr; }
    .controls__row--stats{ grid-template-columns: 1fr 1fr; }
    .main{ grid-template-columns: 1fr; }
  }