:root {
  color-scheme: dark;
  --bg: #0b1020;
  --bg-soft: #121935;
  --panel: rgba(16, 21, 43, 0.82);
  --panel-strong: #141c3a;
  --text: #eef1ff;
  --muted: #aab2d8;
  --accent: #7dd3fc;
  --accent-2: #fbbf24;
  --line: rgba(255, 255, 255, 0.12);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(125, 211, 252, 0.16), transparent 30%),
    radial-gradient(circle at 80% 10%, rgba(251, 191, 36, 0.12), transparent 24%),
    linear-gradient(180deg, #080b16 0%, #0b1020 42%, #080b16 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  padding: 24px;
}

a {
  color: inherit;
  text-decoration: none;
}

#app {
  max-width: 1400px;
  margin: 0 auto;
}

.hero,
.viewer-shell {
  display: grid;
  gap: 20px;
}

.hero-grid {
  grid-template-columns: minmax(0, 2.1fr) minmax(300px, 0.9fr);
  margin-bottom: 28px;
}

.hero-copy,
.hero-panel,
.example-card,
.viewer-info,
.viewer-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-copy,
.hero-panel,
.viewer-info,
.viewer-panel {
  border-radius: 24px;
  padding: 24px;
}

.hero-copy h1,
.viewer-title h1,
.card-header h2,
.viewer-panel-header h2 {
  margin: 10px 0 10px;
  font-size: clamp(2rem, 4vw, 4.5rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.viewer-title h1,
.card-header h2,
.viewer-panel-header h2 {
  font-size: clamp(1.4rem, 2.2vw, 2.5rem);
}

.lede {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.6;
  max-width: 70ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  color: var(--accent);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.meta-pill {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(125, 211, 252, 0.12);
  border: 1px solid rgba(125, 211, 252, 0.28);
  color: var(--text);
  font-size: 0.88rem;
}

.hero-panel h2,
.info-block h2 {
  margin: 0 0 12px;
  font-size: 1.04rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.hero-list,
.card-bullets,
.info-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.example-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 18px;
}

.example-card {
  border-radius: 22px;
  padding: 22px;
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

.card-summary {
  color: var(--muted);
  line-height: 1.65;
}

.card-footer,
.viewer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: auto;
  padding-top: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, rgba(125, 211, 252, 0.9), rgba(251, 191, 36, 0.8));
  color: #07111f;
}

.button-secondary {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line);
}

.viewer-shell {
  grid-template-columns: minmax(320px, 380px) minmax(0, 1fr);
  align-items: start;
}

.viewer-info {
  position: sticky;
  top: 24px;
}

.info-block + .info-block {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.equation {
  margin: 0;
  white-space: pre-wrap;
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  color: #dbeafe;
  background: rgba(255, 255, 255, 0.03);
  padding: 14px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.field-select {
  width: 100%;
  min-height: 42px;
  border-radius: 12px;
  padding: 0 12px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
}

.field-hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.viewer-panel {
  min-height: calc(100vh - 72px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.viewer-canvas {
  flex: 1 1 auto;
  min-height: 72vh;
  border-radius: 18px;
  overflow: hidden;
  background: radial-gradient(circle at top left, rgba(125, 211, 252, 0.06), rgba(0, 0, 0, 0.2));
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.viewer-canvas canvas {
  display: block;
}

@media (max-width: 980px) {
  .hero-grid,
  .viewer-shell {
    grid-template-columns: 1fr;
  }

  .viewer-info {
    position: static;
  }

  body {
    padding: 16px;
  }
}