:root {
  --dome-night: #071520;
  --dome-panel: #0d2230;
  --dome-line: rgba(148, 193, 204, 0.24);
  --dome-cyan: #85d7dd;
  --dome-gold: #f2c66d;
  --dome-copy: #e7f0ee;
  --dome-muted: #9bb3b6;
}

.dome-page {
  background:
    radial-gradient(circle at 18% 4%, rgba(58, 117, 128, 0.18), transparent 30rem),
    linear-gradient(180deg, #f8f1e8 0 21rem, #06131d 21rem 100%);
  padding-bottom: 0;
}

.dome-nav { display: flex; align-items: center; gap: 1rem; }
.dome-nav > a:not(.button-secondary) { color: var(--muted); font-weight: 650; }

.dome-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 2rem;
  padding-top: 4.2rem;
  padding-bottom: 2.5rem;
}

.dome-intro h1 {
  max-width: 760px;
  margin-top: 1rem;
  font: 500 clamp(2.6rem, 6vw, 5.4rem)/0.98 Georgia, "Times New Roman", serif;
  letter-spacing: -0.055em;
}

.dome-intro .lead { max-width: 760px; }

.model-status {
  width: min(280px, 100%);
  padding: 1rem 1.15rem;
  border: 1px solid rgba(94, 72, 53, 0.14);
  border-radius: 18px;
  background: rgba(255, 253, 249, 0.72);
}

.model-status span, .model-status strong { display: block; }
.model-status span { color: var(--primary-dark); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.11em; text-transform: uppercase; }
.model-status strong { margin-top: 0.25rem; font-size: 0.96rem; }

.dome-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.62fr) minmax(290px, 0.62fr);
  align-items: start;
  gap: 1.15rem;
  color: var(--dome-copy);
}

.model-card, .control-card {
  border: 1px solid rgba(133, 215, 221, 0.16);
  border-radius: 24px;
  background: rgba(9, 28, 40, 0.96);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
}

.model-card { overflow: hidden; }
.control-card { padding: 1.25rem; }

.model-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem;
  border-bottom: 1px solid var(--dome-line);
  background: rgba(255, 255, 255, 0.025);
}

.preset-tabs, .playback { display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem; }
.model-toolbar button {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.55rem 0.78rem;
  background: transparent;
  color: var(--dome-muted);
  font: inherit;
  font-size: 0.76rem;
  font-weight: 750;
  cursor: pointer;
}
.model-toolbar button:hover, .model-toolbar button:focus-visible { color: #fff; border-color: var(--dome-line); }
.model-toolbar button.is-active, .model-toolbar .play-button[aria-pressed="true"] { background: rgba(133, 215, 221, 0.13); border-color: rgba(133, 215, 221, 0.25); color: var(--dome-cyan); }

.canvas-shell {
  position: relative;
  min-height: 590px;
  background:
    radial-gradient(circle at 50% 47%, rgba(63, 117, 125, 0.12), transparent 43%),
    linear-gradient(180deg, #081925, #050f17);
  overflow: hidden;
  touch-action: none;
}

[data-dome-canvas] { width: 100%; height: 590px; display: block; cursor: grab; }
[data-dome-canvas]:active { cursor: grabbing; }

.canvas-hint {
  position: absolute;
  left: 1rem;
  bottom: 0.9rem;
  color: rgba(212, 230, 229, 0.52);
  font-size: 0.69rem;
  pointer-events: none;
}

.canvas-legend {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.8rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--dome-line);
  border-radius: 999px;
  background: rgba(4, 14, 21, 0.66);
  color: var(--dome-muted);
  font-size: 0.67rem;
  backdrop-filter: blur(8px);
}
.canvas-legend span { display: inline-flex; align-items: center; gap: 0.35rem; }
.canvas-legend i { width: 0.55rem; height: 0.55rem; border-radius: 50%; }
.legend-sun { background: var(--dome-gold); box-shadow: 0 0 8px var(--dome-gold); }
.legend-moon { background: #dbe8ef; }
.legend-observer { background: #7ad9a8; }

.readout-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--dome-line);
}
.readout-grid > div { padding: 0.9rem 1rem; border-right: 1px solid var(--dome-line); }
.readout-grid > div:last-child { border-right: 0; }
.readout-grid span, .readout-grid strong { display: block; }
.readout-grid span { color: var(--dome-muted); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; }
.readout-grid strong { margin-top: 0.18rem; color: var(--dome-copy); font-size: 0.88rem; }

.control-heading { margin-bottom: 1.1rem; }
.control-heading .eyebrow, .source-panel .eyebrow { border-color: rgba(133, 215, 221, 0.2); background: rgba(133, 215, 221, 0.08); color: var(--dome-cyan); }
.control-heading h2 { margin-top: 0.75rem; font: 500 1.65rem/1.1 Georgia, "Times New Roman", serif; }

.control-group { min-width: 0; margin-bottom: 0.9rem; }
.control-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.control-group label { display: flex; justify-content: space-between; gap: 0.5rem; margin-bottom: 0.4rem; color: var(--dome-muted); font-size: 0.72rem; font-weight: 700; }
.control-group output { color: var(--dome-copy); font-variant-numeric: tabular-nums; }
.control-group input[type="range"] { width: 100%; height: 4px; padding: 0; border: 0; border-radius: 99px; accent-color: var(--dome-cyan); background: var(--dome-line); }

.layer-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem 0.7rem;
  margin: 0.3rem 0 1rem;
  padding: 0.9rem;
  border: 1px solid var(--dome-line);
  border-radius: 16px;
}
.layer-controls legend { padding: 0 0.35rem; color: var(--dome-muted); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.layer-controls label { display: flex; align-items: center; gap: 0.45rem; color: var(--dome-copy); font-size: 0.72rem; cursor: pointer; }
.layer-controls input { width: auto; accent-color: var(--dome-cyan); }

.model-note { padding: 0.95rem; border-radius: 16px; background: rgba(133, 215, 221, 0.07); }
.model-note strong { color: var(--dome-cyan); font-size: 0.78rem; }
.model-note p { margin: 0.4rem 0 0; color: var(--dome-muted); font-size: 0.72rem; line-height: 1.55; }

.explanation-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.15rem;
  padding-top: 1.15rem;
  color: var(--dome-copy);
}
.explanation-card { position: relative; min-height: 220px; padding: 1.4rem; overflow: hidden; border: 1px solid rgba(133, 215, 221, 0.13); border-radius: 22px; background: rgba(10, 31, 43, 0.82); }
.card-index { color: var(--dome-gold); font-size: 0.72rem; font-weight: 900; letter-spacing: 0.12em; }
.explanation-card h2 { margin-top: 2.6rem; font: 500 1.45rem/1.1 Georgia, "Times New Roman", serif; }
.explanation-card p { margin-bottom: 0; color: var(--dome-muted); font-size: 0.86rem; }

.source-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 2rem;
  margin-top: 1.15rem;
  margin-bottom: 4rem;
  padding: 1.8rem;
  border: 1px solid rgba(133, 215, 221, 0.13);
  border-radius: 22px;
  background: rgba(10, 31, 43, 0.82);
  color: var(--dome-copy);
}
.source-panel h2 { margin-top: 0.85rem; font: 500 1.7rem/1.1 Georgia, "Times New Roman", serif; }
.source-panel p { max-width: 720px; margin-bottom: 0; color: var(--dome-muted); font-size: 0.87rem; }
.source-actions { display: flex; flex-direction: column; gap: 0.65rem; }
.source-actions .button-secondary { border-color: var(--dome-line); background: rgba(255,255,255,0.035); color: var(--dome-copy); font-size: 0.78rem; }

@media (max-width: 1000px) {
  .dome-workspace { grid-template-columns: 1fr; }
  .control-card { display: grid; grid-template-columns: 1fr 1fr; gap: 0 1.2rem; }
  .control-heading, .layer-controls, .model-note { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .dome-nav > a:not(.button-secondary) { display: none; }
  .dome-intro { grid-template-columns: 1fr; padding-top: 2.7rem; }
  .model-status { display: none; }
  .model-toolbar { align-items: flex-start; flex-direction: column; }
  .canvas-shell { min-height: 470px; }
  [data-dome-canvas] { height: 470px; }
  .canvas-legend { left: 0.65rem; right: auto; top: 0.65rem; }
  .canvas-hint { display: none; }
  .readout-grid { grid-template-columns: 1fr 1fr; }
  .readout-grid > div:nth-child(2) { border-right: 0; }
  .readout-grid > div:nth-child(-n+2) { border-bottom: 1px solid var(--dome-line); }
  .control-card { display: block; }
  .explanation-grid { grid-template-columns: 1fr; }
  .explanation-card { min-height: 0; }
  .explanation-card h2 { margin-top: 1.5rem; }
  .source-panel { grid-template-columns: 1fr; }
  .source-actions { flex-direction: row; flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .dome-intro h1 { font-size: 2.65rem; }
  .model-card, .control-card { border-radius: 18px; }
  .canvas-shell { min-height: 420px; }
  [data-dome-canvas] { height: 420px; }
  .preset-tabs button:nth-child(3) { display: none; }
  .control-grid { grid-template-columns: 1fr; gap: 0; }
  .layer-controls { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .model-toolbar button { transition: none; }
}