:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --border: #2d3a4f;
  --text: #e8edf4;
  --muted: #9aa8bc;
  --accent: #5eb3ff;
  --accent-dim: #3d7ab8;
  --card-hover: #243044;
  font-family: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: #9ed0ff;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #141c28 0%, var(--bg) 100%);
  padding: 2.5rem 1.5rem 2rem;
}

.site-header__inner,
.site-main {
  max-width: 52rem;
  margin: 0 auto;
}

.site-pill {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  margin-bottom: 1rem;
}

.site-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.site-lede {
  margin: 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.site-main {
  padding: 2rem 1.5rem 3rem;
}

.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  margin: 1.25rem 0 2rem;
}

.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.2rem;
  color: var(--text);
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  background: var(--card-hover);
  border-color: var(--accent-dim);
  color: var(--text);
}

.card__label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.card__title {
  font-weight: 600;
  font-size: 1.05rem;
}

.section {
  margin-bottom: 2.5rem;
}

.section h2 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  font-weight: 600;
}

.slide-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.slide-list li {
  border-bottom: 1px solid var(--border);
}

.slide-list li:last-child {
  border-bottom: none;
}

.slide-list a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.85rem 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.slide-list a:hover {
  background: var(--card-hover);
}

.slide-list__num {
  flex: 0 0 4.5rem;
  font-size: 0.8rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.slide-list__title {
  flex: 1;
}

.site-footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--muted);
}

.note {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
}

.back-link {
  display: inline-block;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
}