@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:wght@400;700&family=Source+Sans+3:wght@400;600&display=swap');

:root {
  --bg: #f7f4ee;
  --paper: #ffffff;
  --ink: #1f2428;
  --muted: #5b646d;
  --accent: #226f74;
  --accent-2: #d7b56d;
  --border: #e6e1d9;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(1200px 400px at 20% -10%, #fff7e6 0%, transparent 60%),
              radial-gradient(900px 500px at 90% 0%, #e9f4f4 0%, transparent 55%),
              var(--bg);
  font-family: 'Source Sans 3', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
}

.container {
  width: min(1000px, 92vw);
  margin: 0 auto;
}

.site-header {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  font-family: 'Libre Baskerville', serif;
  font-size: 1.8rem;
  text-decoration: none;
  color: var(--ink);
}

.site-subtitle {
  margin: 0.4rem 0 0;
  color: var(--muted);
}

main {
  padding: 2rem 0 4rem;
}

.intro h1 {
  font-family: 'Libre Baskerville', serif;
  font-size: 2.2rem;
  margin-bottom: 0.6rem;
}

.algorithm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.algo-card {
  background: var(--paper);
  border: 1px solid var(--border);
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.algo-card h2 {
  margin: 0;
  font-family: 'Libre Baskerville', serif;
  font-size: 1.3rem;
}

.algo-card a {
  color: var(--accent);
  text-decoration: none;
}

.read-more {
  margin-top: auto;
  font-weight: 600;
}

.tag-list {
  list-style: none;
  display: flex;
  gap: 0.4rem;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

.tag-list li {
  background: #f1efe9;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--muted);
}

.algorithm h1 {
  font-family: 'Libre Baskerville', serif;
  font-size: 2.1rem;
}

.lede {
  color: var(--muted);
  font-size: 1.05rem;
}

.algorithm-section {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.4rem;
  margin: 1.2rem 0;
}

.algorithm-section h2 {
  margin-top: 0;
  font-family: 'Libre Baskerville', serif;
  font-size: 1.2rem;
}

.section-body pre,
.section-body code {
  background: #f3f1ec;
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
}

.site-footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .site-header {
    padding-top: 2rem;
  }

  .algo-card {
    padding: 1.2rem;
  }
}