:root {
  --bg: #0b0d10;
  --surface: #ffffff;
  --text: #eef2f7;
  --muted: #b9c2cf;
  --line: #273041;
  --card-text: #16181d;
  --card-muted: #5f6673;
  --accent: #0f766e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  padding: 2rem 0 1rem;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1.2fr 0.8fr;
}

.hero h1 {
  margin: 0.35rem 0 0.75rem;
  font-size: clamp(1.6rem, 3.3vw, 2.3rem);
  line-height: 1.15;
  font-family: "Space Grotesk", sans-serif;
}

.eyebrow {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 800;
}

.hero-copy p,
.panel p,
.hero-panel p {
  margin: 0;
  color: var(--muted);
}

.inline-greek {
  margin-top: 0.9rem;
  padding: 0.5rem 0.6rem;
  background: #f1f6f6;
  border: 1px solid #d4e6e3;
  border-radius: 6px;
  color: var(--card-text);
}

.greek-table-wrap {
  max-height: 190px;
  overflow: auto;
}

.greek-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.greek-table th,
.greek-table td {
  text-align: left;
  padding: 0.45rem 0.4rem;
  border-bottom: 1px solid #dde7e5;
  vertical-align: middle;
}

.greek-table th {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #4a5867;
}

.greek-table td.symbol {
  width: 68px;
  text-align: center;
  line-height: 1;
}

.symbol-glyph {
  display: inline-block;
  font-size: 1.32rem;
  min-width: 1.4rem;
}

.greek-table td:not(.symbol) {
  font-size: 0.98rem;
}

.symbol-glyph .katex {
  font-size: 1.15em;
  line-height: 1;
}

.hero-panel,
.panel {
  padding: 0.1rem 0;
}

.hero-panel h2,
.panel h2 {
  margin: 0 0 0.55rem;
  font-family: "Space Grotesk", sans-serif;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.3rem;
  padding-bottom: 2rem;
}

.explain {
  grid-column: span 2;
}

.explain > p {
  margin-bottom: 0.75rem;
}

.concepts {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.concepts article {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.concepts h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--text);
}

.concepts p {
  margin: 0;
  font-size: 0.97rem;
  color: var(--muted);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

.plot {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #0f131a;
  min-height: 220px;
  object-fit: contain;
}

.card {
  background: var(--surface);
  border: 1px solid #e4e6eb;
  border-radius: 8px;
  padding: 1rem;
  color: var(--card-text);
}

.card .muted {
  color: var(--card-muted);
}

.canvas-wrap {
  width: min(100%, 360px);
  background: #fafafa;
  border: 1px solid #e4e6eb;
  border-radius: 6px;
  padding: 0.4rem;
}

#drawCanvas {
  width: 100%;
  height: auto;
  border: 1px dashed #d9dde5;
  border-radius: 5px;
  background: #ffffff;
  touch-action: none;
}

.controls {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.55rem;
}

.btn {
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0.52rem 0.78rem;
  font-weight: 700;
  cursor: pointer;
}

.btn.primary {
  background: var(--accent);
  color: #fff;
}

.btn.secondary {
  background: #f4f5f8;
  border-color: #d8dce4;
  color: #2c3340;
}

.result {
  margin-top: 0.8rem;
  font-weight: 700;
}

.top-list {
  list-style: none;
  margin: 0.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.top-list li {
  background: #f8fafb;
  border: 1px solid #e4e6eb;
  border-radius: 5px;
  padding: 0.45rem 0.55rem;
  font-size: 0.92rem;
}

.muted {
  color: var(--muted);
}

.site-footer {
  padding: 0.4rem 0 0.9rem;
}

.footer-inner {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
  color: #8a93a2;
  font-size: 0.82rem;
  opacity: 0.82;
}

.author {
  letter-spacing: 0.01em;
}

.footer-links {
  display: flex;
  gap: 0.42rem;
}

.footer-links a {
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #8a93a2;
  text-decoration: none;
  opacity: 0.76;
}

.footer-links a svg {
  width: 13px;
  height: 13px;
  fill: currentColor;
}

.footer-links a:hover {
  color: #c4ccd8;
  opacity: 1;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .explain {
    grid-column: span 1;
  }

  .concepts {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    font-size: 0.78rem;
  }
}