/* =========
   Tokens
   ========= */
   :root {
    /* Colours */
    --panel-bg: #ffffff;
    --panel-text: #111111;
    --accent: #7aa2ff;
  
    /* Layout */
    --sidebar-w: 360px;
    --sidebar-w-min: 280px;
    --wrap-pad: 24px;
    --gap: 24px;
    --radius: 10px;
  
    /* Shadow */
    --shadow-sm: 0 2px 12px rgba(0,0,0,.08);
    --shadow-md: 0 8px 40px rgba(0,0,0,.12);
  
    color-scheme: light dark;
  }
  
  @media (prefers-color-scheme: dark) {
    :root {
      --panel-bg: #121212;
      --panel-text: #f2f2f2;
      --shadow-sm: 0 2px 12px rgba(0,0,0,.4);
      --shadow-md: 0 8px 40px rgba(0,0,0,.5);
    }
  }
  
  /* =========
     Base a11y + motion
     ========= */
  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
  
  @media (prefers-reduced-motion: reduce) {
    * {
      animation-duration: .001ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: .001ms !important;
      scroll-behavior: auto !important;
    }
  }
  
  /* Improve form hit targets on touch */
  @media (pointer: coarse) {
    :where(select, button) { padding-block: 14px; }
  }
  
  /* =========
     Layout: fixed-width controls + fluid stage
     ========= */
  .shell {
    display: grid;
    grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
    gap: var(--gap);
    inline-size: 100%;
    padding: var(--wrap-pad) clamp(1rem, 4vw, 2rem);
    box-sizing: border-box;
    align-items: start;
  }
  
  .sidebar {
    position: sticky;
    inset-block-start: var(--wrap-pad);
    align-self: start;
    display: flex;
    align-items: flex-start;
  }
  
  /* Panel */
  .controls {
    inline-size: 100%;
    max-inline-size: var(--sidebar-w);
    min-inline-size: var(--sidebar-w-min);
    background: var(--panel-bg);
    color: var(--panel-text);
    border-radius: var(--radius);
    padding: 16px;
    display: grid;
    gap: 12px;
    align-content: start;
    box-shadow: var(--shadow-sm);
  }
  
  /* Rows and labels */
  .row {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
  }
  
  label {
    display: flex;
    gap: 8px;
    align-items: center;
  }
  
  /* =========
     Controls: buttons, selects, range
     ========= */
  select,
  button {
    appearance: none;
    border: 0;
    border-radius: var(--radius);
    padding: 10px 14px;
    cursor: pointer;
    background: #111;
    color: #fff;
    line-height: 1;
    transition: transform .06s ease, filter .2s ease;
  }
  
  @media (prefers-color-scheme: dark) {
    select,
    button {
      background: #e9e9e9;
      color: #111;
    }
  }
  
  select:focus-visible,
  button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
  
  button:active { transform: translateY(1px); }
  button:disabled { opacity: .6; cursor: not-allowed; }
  
  input[type="range"] {
    inline-size: min(320px, 100%);
    accent-color: var(--accent);
  }
  
  /* Keep width stable when label text changes */
  .sidesValue {
    display: inline-block;
    min-inline-size: 10ch;
    text-align: start;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
  }
  
  /* =========
     Stage + Canvas
     ========= */
  .stage {
    /* min-block-size: 60svh; */
    display: grid;
    place-items: center;
  }
  
  .canvasWrap {
    inline-size: 100%;
    max-inline-size: 800px;
    aspect-ratio: 8 / 11;
    display: grid;
    place-items: center;
  }
  
  /* Let CSS control size; height follows width */
  canvas {
    inline-size: 100%;
    block-size: auto;
    background: #fff;
    border-radius: 6px;
    box-shadow: var(--shadow-md);
  }
  
  /* If your JS sets canvas width/height attributes, keep them
     for pixel density but DO NOT set style="width/height" inline. */
  
  /* =========
     Breakpoint: stack controls above canvas
     ========= */
  @media (max-width: 900px) {
    .shell {
      grid-template-columns: 1fr;
      gap: 16px;
      padding: 16px;
    }
    .sidebar { position: static; }
    .controls {
      max-inline-size: 560px;
      min-inline-size: 0;
      margin-inline: auto;
    }
    .canvasWrap {
      max-inline-size: 100%;
      padding: 12px;
    }
  }