:root {
    --bg-color: #131319;
    --text-color: #e0e0e0;
    --edge-color: #334;
    --edge-label-color: #667;
    --panel-border: #334;
    --panel-border-hover: #556;
    --panel-text: #667;
    --panel-hover: #aab;
    --panel-text-active: #d0d0d0;
    --panel-fill: rgba(255, 255, 255, 0.03);
    --modal-surface: #1a1a22;
    --modal-backdrop: rgba(8, 10, 16, 0.72);
    --input-fill: rgba(255, 255, 255, 0.04);
    --credit-color: rgba(170, 170, 187, 0.48);
    --credit-hover-color: rgba(208, 208, 208, 0.78);
    --color-swatch-border: rgba(255, 255, 255, 0.18);
    --control-height: 2.75rem;
    --font-workhorse: "Switzer", system-ui, sans-serif;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    background: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-workhorse);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    min-height: 100dvh;
    width: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    user-select: none;
    -webkit-user-select: none;
  }
  body.timer-modal-open {
    overflow: hidden;
  }
  .canvas-container {
    position: relative;
    overflow: hidden;
  }
  canvas {
    touch-action: none;
    cursor: default;
    position: absolute;
    top: 0;
    left: 0;
  }
  #canvas2d { z-index: 1; }
  #canvasGL { z-index: 2; }
  #phase-label {
    font-family: var(--font-workhorse);
    font-size: 1.6rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: min(calc(100vw - 1.5rem), 32rem);
    min-height: 4.4rem;
    padding: max(1rem, calc(env(safe-area-inset-top) + 0.35rem)) 0.75rem 1rem;
    line-height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    text-transform: uppercase;
    z-index: 12;
    color: var(--panel-text-active);
    pointer-events: none;
  }
  #mode-toggle {
    display: flex;
    gap: 0.6rem;
    z-index: 3;
    position: relative;
  }
  .mode-btn {
    background: transparent;
    border: 1px solid var(--panel-border);
    color: var(--panel-text);
    font-family: var(--font-workhorse);
    font-size: 0.84rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    min-height: var(--control-height);
    padding: 0 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }
  .mode-btn:hover {
    color: var(--panel-hover);
    border-color: var(--panel-border-hover);
  }
  .mode-btn.active {
    color: var(--panel-text-active);
    border-color: var(--panel-text);
    background: var(--panel-fill);
  }
  #chime-test[hidden] { display: none; }
  #timer-toggle,
  #chime-test {
    border-radius: 999px;
    padding: 0 0.85rem;
    background: var(--panel-fill);
    gap: 0.4rem;
  }
  #timer-toggle .timer-badge {
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    line-height: 1;
  }
  #timer-toggle .timer-badge[hidden] { display: none; }
  .mode-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
  }
  #controls-stack {
    position: fixed;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    width: min(calc(100vw - 1.5rem), 24rem);
    padding: 0 0.75rem max(1rem, calc(env(safe-area-inset-bottom) + 0.6rem));
    z-index: 12;
  }
  .timer-modal-backdrop {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: max(1rem, env(safe-area-inset-top)) 1rem max(1rem, env(safe-area-inset-bottom));
    background: var(--modal-backdrop);
    z-index: 30;
  }
  .timer-modal-backdrop[hidden] { display: none; }
  .timer-modal {
    width: min(calc(100vw - 2rem), 22rem);
    background: var(--modal-surface);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 1rem 1rem 1.1rem;
    color: var(--panel-text-active);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.44);
  }
  .timer-modal-title {
    font-size: 0.92rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--panel-text-active);
    margin-bottom: 0.4rem;
  }
  .timer-modal-hint {
    font-size: 0.85rem;
    color: var(--panel-text);
    margin-bottom: 1rem;
    line-height: 1.4;
  }
  .timer-input {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--panel-text);
    margin-bottom: 1.3rem;
  }
  .timer-input input {
    background: var(--input-fill);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    color: var(--panel-text-active);
    font: inherit;
    font-size: 1rem;
    font-weight: 400;
    text-transform: none;
    letter-spacing: 0;
    padding: 0.6rem 0.75rem;
    min-height: var(--control-height);
    appearance: none;
    -webkit-appearance: none;
  }
  .timer-input input:focus {
    outline: none;
    border-color: var(--panel-text);
  }
  .timer-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.6rem;
  }
  #controls {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-top: 0;
    z-index: 3;
    position: relative;
    flex-wrap: wrap;
    justify-content: center;
  }
  #site-credit {
    position: fixed;
    right: max(0.85rem, calc(env(safe-area-inset-right) + 0.85rem));
    bottom: max(0.85rem, calc(env(safe-area-inset-bottom) + 0.65rem));
    z-index: 12;
    color: var(--credit-color);
    font-family: var(--font-workhorse);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    line-height: 1;
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.24s ease;
    -webkit-tap-highlight-color: transparent;
  }
  #site-credit:hover,
  #site-credit:focus-visible {
    color: var(--credit-hover-color);
    outline: none;
  }
  #bg-control[hidden] { display: none; }
  #bg-control {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    min-height: var(--control-height);
    padding: 0 0.75rem;
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    color: var(--panel-text-active);
    background: var(--panel-fill);
    font-size: 0.84rem;
    font-weight: 500;
    line-height: 1;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
  #bg-color-input {
    width: 1.55rem;
    height: 1.55rem;
    display: block;
    border: 0;
    padding: 0;
    background: transparent;
    cursor: pointer;
  }
  #bg-color-input::-webkit-color-swatch-wrapper { padding: 0; }
  #bg-color-input::-webkit-color-swatch {
    border: 1px solid var(--color-swatch-border);
    border-radius: 999px;
  }
  #bg-color-input::-moz-color-swatch {
    border: 1px solid var(--color-swatch-border);
    border-radius: 999px;
  }
  @media (max-width: 640px) {
    #controls-stack {
      padding-bottom: max(2.65rem, calc(env(safe-area-inset-bottom) + 2.25rem));
    }
    #site-credit {
      left: 50%;
      right: auto;
      bottom: max(0.85rem, calc(env(safe-area-inset-bottom) + 0.65rem));
      transform: translateX(-50%);
      width: max-content;
      max-width: calc(100vw - 1.5rem);
      text-align: center;
    }
    #controls {
      gap: 0.7rem;
    }
    #bg-control {
      font-size: 0.78rem;
      letter-spacing: 0.06em;
    }
  }