:root {
  --fg: #0f172a;
  --muted: #64748b;
  --bg: #ffffff;
  --card: #f8fafc;
  --border: #e2e8f0;

  --link: #0b62d6;
  --link-dark: #60a5fa;

  --code-bg: #f1f5f9;
  --code-fg: #0f172a;
  --code-bg-dark: #334155;
  --code-fg-dark: #e2e8f0;

  --radius: 12px;
  --container: 900px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f8fafc;
    --muted: #94a3b8;
    --bg: #0f172a;
    --card: #1e293b;
    --border: #334155;
    --link: var(--link-dark);
  }
}

/* --- Base --- */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
  margin: 0;
  color: var(--fg);
  background: var(--bg);
}

main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 32px 18px 64px;
}

header { margin-bottom: 22px; }

h1 { font-size: 28px; margin: 0 0 8px; }
h2 { margin-top: 28px; font-size: 20px; }
h3 { margin-top: 18px; font-size: 16px; }

p, li { line-height: 1.7; }

.meta {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

ul { padding-left: 20px; }

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

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.small { font-size: 13px; color: var(--muted); }

.hr {
  height: 1px;
  background: var(--border);
  margin: 22px 0;
}

code {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 2px 6px;
  border-radius: 6px;
}

@media (prefers-color-scheme: dark) {
  code {
    background: var(--code-bg-dark);
    color: var(--code-fg-dark);
  }
}

/* --- Footer --- */
footer {
  margin-top: 80px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
  color: var(--muted);
  font-size: 0.85rem;
}

footer a {
  color: inherit;
  text-decoration: none;
  margin: 0 8px;
}

footer a:hover { text-decoration: underline; }


/* LANDING PAGE */

main.landing {
  max-width: 800px;
  padding: 60px 20px;
  text-align: center;
  line-height: 1.6;
}

main.landing h1 {
  font-size: 3rem;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
  line-height: 1.1;
}

main.landing h2 {
  font-size: 1.5rem;
  margin-top: 40px;
  margin-bottom: 12px;
}

.subhead {
  font-size: 1.25rem;
  color: var(--muted);
  max-width: 500px;
  margin: 0 auto 32px;
  font-weight: 400;
}

/* Buttons */
.cta-container {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: var(--fg);
  color: var(--bg);
  text-decoration: none;
  border-radius: 99px;
  font-weight: 600;
  transition: opacity 0.2s;
  min-width: 140px;
}

.btn:hover { opacity: 0.9; }

.btn.secondary {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  .btn { background: var(--fg); color: var(--bg); }
}

.divider {
  height: 1px;
  background: var(--border);
  width: 100px;
  margin: 0 auto;
}

/* Feature Grid */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin: 40px 0;
  text-align: left;
}

@media (min-width: 640px) {
  .grid { grid-template-columns: 1fr 1fr; }
}

main.landing .card {
  border-radius: 16px;
  padding: 24px;
}

main.landing .card h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

main.landing .card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.icon {
  font-size: 24px;
  margin-bottom: 12px;
  display: block;
}