:root {
  --bg: #e7eaf0;
  --panel: #ffffff;
  --border: #d4d9e1;
  --text: #1f2430;
  --text-muted: #636b78;
  --accent: #2563eb;
  --ink: #1b2030;
  --ink-text: #f3f5f8;
  --ink-muted: #a7aec0;
  --radius: 10px;
  --header-h: 108px;
  --footer-h: 64px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* ---------- Header ---------- */

.site-header {
  background: var(--ink);
}

.site-header__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 32px;
}

.site-title {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink-text);
}

.site-tagline {
  margin: 6px 0 0;
  color: var(--ink-muted);
  font-size: 1rem;
}

/* ---------- Layout ---------- */

.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 32px 48px;
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 28px;
  align-items: start;
}

/* ---------- Years / sidebar ---------- */

.years {
  display: flex;
  flex-direction: column;
  gap: 22px;
  position: sticky;
  top: 24px;
}

.year-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.year-heading {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.year-events {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  --series-color: var(--accent);
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border-left: 4px solid var(--series-color);
  transition: background 0.12s ease, color 0.12s ease, box-shadow 0.12s ease;
}

.pill:hover {
  background: #dde2ea;
}

.pill.is-active {
  background: var(--series-color);
  border-color: var(--series-color);
  color: #fff;
  box-shadow: 0 2px 6px -2px rgba(0, 0, 0, 0.35);
}

/* ---------- Detail panel ---------- */

.detail {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  min-height: 320px;
  box-shadow: 0 1px 2px rgba(20, 24, 36, 0.04), 0 8px 20px -12px rgba(20, 24, 36, 0.18);
}

.detail__empty {
  color: var(--text-muted);
}

.detail__tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  color: #fff;
  background: var(--series-color, var(--accent));
  margin-bottom: 14px;
}

.detail__title {
  margin: 0 0 6px;
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.detail__meta {
  margin: 0 0 18px;
  color: var(--text-muted);
  font-size: 0.95rem;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.detail__meta span::before {
  content: "•";
  margin-right: 10px;
  color: var(--border);
}

.detail__meta span:first-child::before {
  content: none;
  margin-right: 0;
}

.detail__blurb {
  line-height: 1.6;
  font-size: 1rem;
  max-width: 640px;
}

.detail__link {
  display: inline-block;
  margin-top: 20px;
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.detail__link:hover {
  text-decoration: underline;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--ink);
}

.site-footer__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.site-footer__by {
  margin: 0;
}

.site-footer__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 0;
  padding: 0;
}

.site-footer__links a {
  color: var(--ink-text);
  text-decoration: none;
  font-weight: 600;
}

.site-footer__links a:hover {
  color: #8ab4ff;
  text-decoration: underline;
}

/* ---------- Responsive ---------- */

@media (max-width: 760px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .years {
    position: static;
  }
}