:root {
  --bg: #f4efe7;
  --panel: rgba(255, 250, 243, 0.88);
  --ink: #1a1d1a;
  --muted: #5d6258;
  --line: rgba(38, 42, 36, 0.12);
  --accent: #0f766e;
  --accent-soft: rgba(15, 118, 110, 0.14);
  --secondary: #9a3412;
  --shadow: 0 18px 50px rgba(34, 33, 29, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.16), transparent 30%),
    radial-gradient(circle at bottom right, rgba(154, 52, 18, 0.18), transparent 35%),
    linear-gradient(180deg, #f8f4ec 0%, var(--bg) 100%);
}

button,
input {
  font: inherit;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.page {
  width: min(1380px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0 44px;
}

.hero {
  display: flex;
  gap: 20px;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3.25rem);
  line-height: 1.04;
}

.lead {
  max-width: 60ch;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(100px, 1fr));
  gap: 12px;
  width: min(420px, 100%);
}

.stat,
.panel,
.canvas-card {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.stat {
  border-radius: 5px;
  padding: 14px 16px;
}

.stat-label {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  margin-bottom: 8px;
}

.layout {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 18px;
}

.panel {
  border-radius: 5px;
  padding: 18px;
}

.panel-header h2,
.formula-card h3 {
  margin: 0;
  font-size: 1.1rem;
}

.panel-header p,
.small {
  color: var(--muted);
}

.slider-group {
  display: grid;
  gap: 16px;
  margin: 18px 0 22px;
}

.slider {
  display: grid;
  gap: 7px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.92rem;
}

.slider label {
  font-weight: 600;
}

.slider output {
  color: var(--secondary);
  font-variant-numeric: tabular-nums;
}

.slider input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

button {
  border: none;
  border-radius: 999px;
  padding: 10px 16px;
  background: var(--accent);
  color: white;
  cursor: pointer;
  min-width: 5rem;
}

button.secondary {
  background: var(--accent-soft);
  color: var(--ink);
}

.metrics {
  /* display: grid; */
  display: none;
  gap: 10px;
  margin-bottom: 20px;
}

.metric {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.metric strong {
  font-variant-numeric: tabular-nums;
}

.formula-card {
  padding-top: 4px;
}

.visual-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.model-panel {
  margin-top: 20px;
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.model-card {
  border: 1px solid var(--line);
  border-radius: 5px;
  background: rgba(255, 253, 249, 0.8);
  padding: 16px;
}

.model-card h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.model-card p {
  margin: 0 0 10px;
  line-height: 1.6;
}

.equation-block {
  margin: 12px 0;
  padding: 12px 14px;
  border-left: 4px solid var(--accent);
  border-radius: 5px;
  background: rgba(15, 118, 110, 0.08);
}

.equation-block p:last-child,
.model-card p:last-child {
  margin-bottom: 0;
}

.canvas-card {
  margin: 0;
  border-radius: 5px;
  overflow: hidden;
  padding: 14px;
}

.canvas-card figcaption {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.92rem;
}

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

canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  border-radius: 0px;
  image-rendering: pixelated;
  background: #f8f8f4;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .visual-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 760px) {
  .page {
    width: min(100vw - 20px, 100%);
    padding-top: 18px;
  }

  .hero {
    flex-direction: column;
    align-items: start;
  }

  .hero-stats,
  .visual-grid {
    grid-template-columns: 1fr;
  }
}