:root {
  --red: #c8102e;
  --gold: #ffc72c;
  --cream: #f5f1e3;
  --paper: #f5f1e3;
  --brown: #5c3d2e;
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --max: 960px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--paper) 0%, #fff 240px);
  line-height: 1.6;
}

a { color: var(--red); }

header {
  background: linear-gradient(135deg, var(--red), #8b0000);
  color: #fff;
  padding: 3rem 1.5rem 2.5rem;
}

header .wrap,
main .wrap,
footer .wrap {
  max-width: var(--max);
  margin: 0 auto;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 5vw, 2.75rem);
}

header p {
  margin: 0;
  max-width: 40rem;
  opacity: 0.92;
}

.badge {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

main { padding: 2rem 1.5rem 4rem; }

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: #fff;
  border-radius: 16px;
  padding: 1.25rem 1.35rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.card h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.button {
  display: inline-block;
  background: var(--red);
  color: #fff !important;
  text-decoration: none;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  font-weight: 600;
}

.button.secondary {
  background: #fff;
  color: var(--red) !important;
  border: 2px solid var(--red);
}

footer {
  border-top: 1px solid #eee;
  padding: 2rem 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

footer nav a {
  margin-right: 1rem;
  color: var(--muted);
}

.hero-emoji { font-size: 3rem; margin-bottom: 0.5rem; }

.bmi-mark,
.layer-mark {
  display: block;
  margin: 0 auto 1.25rem;
  width: min(180px, 42vw);
  height: auto;
  aspect-ratio: 1;
}

.landing {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, var(--paper) 0%, #fff 50%);
}

.landing-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
}

.landing-content {
  text-align: center;
  max-width: 24rem;
}

.landing-content h1 {
  margin: 0 0 0.5rem;
  font-family: "New York", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.landing-content .tagline {
  margin: 0 0 1.75rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.landing-content .button {
  margin-top: 0;
}

.landing-footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid #eee;
  color: var(--muted);
  font-size: 0.9rem;
}

.landing-footer p {
  margin: 0 0 0.5rem;
}

.landing-footer nav a {
  margin: 0 0.75rem;
  color: var(--muted);
  text-decoration: none;
}

.landing-footer nav a:hover {
  color: var(--red);
}

.prose h2 { margin-top: 2rem; }
.prose ul { padding-left: 1.25rem; }

.deep-link-box {
  background: var(--cream);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-top: 1rem;
}

.deep-link-box code {
  word-break: break-all;
}

.open-app {
  margin-top: 1rem;
}

@media (prefers-color-scheme: dark) {
  body { background: #111; color: #f5f5f5; }
  .card { background: #1c1c1e; }
  footer { border-color: #333; }
}