@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Syne:wght@400;700;800&display=swap');

  :root {
    --bg: #0a0a0f;
    --panel: #11111a;
    --border: #1e1e30;
    --accent: #00e5ff;
    --hot: #ff4d6d;
    --cool: #4dffb4;
    --mid: #ffd166;
    --text: #c8c8e8;
    --dim: #555570;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Space Mono', monospace;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 16px;
  }

  h1 {
    font-family: 'Syne', sans-serif;
    font-weight: 800;
    font-size: clamp(1.4rem, 4vw, 2.2rem);
    color: #fff;
    letter-spacing: -0.03em;
    margin-bottom: 4px;
  }

  .subtitle {
    font-size: 0.72rem;
    color: var(--dim);
    letter-spacing: 0.15em;
    margin-bottom: 28px;
    text-transform: uppercase;
  }

  .layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    width: 100%;
    max-width: 960px;
  }

  @media (max-width: 680px) {
    .layout { grid-template-columns: 1fr; }
  }

  .panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px;
  }

  .panel-title {
    font-family: 'Syne', sans-serif;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 14px;
  }

  /* Network canvas */
  #netCanvas {
    width: 100%;
    height: 260px;
    display: block;
  }

  /* Network canvas */
  #inputCanvas {
    width: 100%;
    height: 260px;
    display: block;
  }

  /* Decision boundary */
  #boundaryCanvas {
    width: 100%;
    height: 320px;
    display: block;
    border-radius: 6px;
  }

  /* Loss chart */
  #lossCanvas {
    width: 100%;
    height: 180px;
    display: block;
  }

  /* Stats row */
  .stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 4px;
  }

  .stat {
    background: #0d0d18;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px;
    text-align: center;
  }

  .stat-label {
    font-size: 0.6rem;
    color: var(--dim);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 4px;
  }

  .stat-value {
    font-family: 'Syne', sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
  }

  /* Controls */
  .controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    margin-top: 14px;
  }

  button {
    font-family: 'Space Mono', monospace;
    font-size: 0.72rem;
    padding: 9px 18px;
    border-radius: 6px;
    border: 1px solid var(--accent);
    background: transparent;
    color: var(--accent);
    cursor: pointer;
    transition: all 0.15s;
    letter-spacing: 0.05em;
  }

  button:hover { background: var(--accent); color: #000; }
  button:disabled { opacity: 0.3; cursor: default; }
  button.primary { background: var(--accent); color: #000; border-color: var(--accent); }
  button.primary:hover { background: #00c4dd; }
  button.danger { border-color: var(--hot); color: var(--hot); }
  button.danger:hover { background: var(--hot); color: #fff; }

  .speed-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.65rem;
    color: var(--dim);
    margin-left: auto;
  }

  .dataset-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.65rem;
    color: var(--dim);
    width: 100%;
    margin-top: 10px;
  }

  select#datasetSelect {
    font-family: 'Space Mono', monospace;
    font-size: 0.68rem;
    background: #0d0d18;
    color: var(--text);
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
    flex: 1;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%2300e5ff'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 28px;
  }

  select#datasetSelect:focus { outline: none; border-color: var(--cool); }

  input[type=range] {
    accent-color: var(--accent);
    width: 80px;
  }

  /* Log */
  .log {
    font-size: 0.65rem;
    color: var(--dim);
    height: 56px;
    overflow-y: auto;
    background: #0d0d18;
    border-radius: 6px;
    padding: 8px 10px;
    margin-top: 12px;
    line-height: 1.7;
  }

  .log span { color: var(--accent); }

  /* Legend */
  .legend {
    display: flex;
    gap: 16px;
    font-size: 0.62rem;
    color: var(--dim);
    margin-top: 8px;
  }

  .dot {
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 50%;
    margin-right: 4px;
    vertical-align: middle;
  }