/* Engineering workbench: palettes and responsive composition. */
:root {
  --bg: #f5f6f2;
  --fg: #1e2a2b;
  --dim: #687472;
  --accent-bg: #e2eeea;
  --accent-fg: #367b70;
  --muted-bg: #fafbf8;
  --muted-border: #d9dfd9;
  --rule: #839b94;
  --scene-grid: rgba(64, 103, 94, 0.1);
  --scene-halo: rgba(147, 195, 171, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1113;
    --fg: #e0e8e3;
    --dim: #93a49c;
    --accent-bg: #182d28;
    --accent-fg: #95cdb5;
    --muted-bg: #10191b;
    --muted-border: #263532;
    --rule: #698d7e;
    --scene-grid: rgba(117, 168, 146, 0.1);
    --scene-halo: rgba(50, 114, 89, 0.1);
  }
}

:root[data-theme="dark"] {
  --bg: #0b1113;
  --fg: #e0e8e3;
  --dim: #93a49c;
  --accent-bg: #182d28;
  --accent-fg: #95cdb5;
  --muted-bg: #10191b;
  --muted-border: #263532;
  --rule: #698d7e;
  --scene-grid: rgba(117, 168, 146, 0.1);
  --scene-halo: rgba(50, 114, 89, 0.1);
}

body {
  isolation: isolate;
  padding-bottom: 88px;
}

.bg-art {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.bg-art::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at center, var(--scene-grid) 0.7px, transparent 0.9px);
  background-size: 24px 24px;
  mask-image: linear-gradient(90deg, #000, transparent 38%, transparent 62%, #000);
}

.bg-art::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 14% 53%, var(--scene-halo), transparent 35%),
    radial-gradient(ellipse at 86% 53%, var(--scene-halo), transparent 35%);
}

.bg-art canvas {
  display: block;
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
}

.header b {
  color: var(--dim);
  font-weight: 450;
  letter-spacing: 0.025em;
}

.theme-toggle {
  top: 22px;
  right: 24px;
  width: 38px;
  height: 38px;
  color: var(--dim);
}

.theme-toggle .theme-sun,
.theme-toggle.is-dark .theme-moon {
  display: none;
}

.theme-toggle.is-dark .theme-sun {
  display: block;
}

.motion-toggle {
  position: fixed;
  z-index: 5;
  bottom: 24px;
  left: 28px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 36px;
  padding: 7px 12px;
  border: 1px solid var(--muted-border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--dim);
  font: 10px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 0.035em;
  cursor: pointer;
}

.motion-toggle[hidden],
.motion-toggle .motion-play,
.motion-toggle[aria-pressed="true"] .motion-pause {
  display: none;
}

.motion-toggle[aria-pressed="true"] .motion-play {
  display: block;
}

.motion-toggle:hover {
  color: var(--fg);
  border-color: var(--rule);
}

.motion-toggle:focus-visible,
.theme-toggle:focus-visible {
  outline: 2px solid var(--accent-fg);
  outline-offset: 4px;
}

.mobile-scene-space {
  display: none;
}

.scene-views {
  display: none;
}

@media (max-width: 1199px) {
  .header {
    margin: 40px 0 28px;
  }

  .mobile-scene-space {
    display: block;
    height: 480px;
    margin-top: 12px;
  }

  .mobile-scene-space[data-view="schematic"] {
    height: 550px;
  }

  .scene-views:not([hidden]) {
    display: flex;
    width: fit-content;
    gap: 0;
    margin: 22px auto 0;
    border: 1px solid var(--muted-border);
    border-radius: 4px;
  }

  .scene-views button {
    border: 0;
    border-radius: 3px;
    padding: 8px 12px;
    min-height: 36px;
    background: transparent;
    color: var(--dim);
    font: 10px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    cursor: pointer;
  }

  .scene-views button[aria-pressed="true"] {
    background: var(--accent-bg);
    color: var(--accent-fg);
  }

  .scene-views button:focus-visible {
    outline: 2px solid var(--accent-fg);
    outline-offset: 3px;
  }

  .bg-art::before {
    mask-image: radial-gradient(ellipse at 50% 30%, #000, transparent 75%);
  }

  .bg-art::after {
    background: radial-gradient(ellipse at 50% 34%, var(--scene-halo), transparent 60%);
  }

  .motion-toggle {
    position: absolute;
    top: 22px;
    bottom: auto;
    left: 20px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 36px 20px 48px;
  }

  .header {
    margin-top: 58px;
    margin-bottom: 12px;
  }

  .header .logo {
    width: min(300px, 82vw);
  }

  .header b {
    font-size: 13px;
  }

  .mobile-scene-space {
    height: 456px;
  }

  .mobile-scene-space[data-view="schematic"] {
    height: 448px;
  }

  .theme-toggle {
    right: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
  }
}

@media print {
  .bg-art, .motion-toggle, .theme-toggle, .mobile-scene-space, .scene-views {
    display: none !important;
  }

  .header {
    margin: 0 0 32px;
  }
}