:root {
  --bg: #f4f6f8;
  --bg-soft: #ffffff;
  --surface: #ffffff;
  --text: #1d2430;
  --muted: #5f6b7b;
  --line: #d9dee7;
  --accent: #d64045;
  --accent-soft: #ffe9ea;
  --green: #2f9e44;
  --green-soft: #e8f7ec;
  --blue: #1f6feb;
  --blue-soft: #e9f1ff;
  --purple: #7c4dff;
  --purple-soft: #f0eaff;
  --card-shadow: 0 10px 30px rgba(19, 35, 64, 0.08);
  --radius: 14px;
  --transition: 0.3s ease;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: linear-gradient(180deg, #f7f8fb 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.85rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.03em;
  text-decoration: none;
}

.top-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.top-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.42rem 0.75rem;
  border-radius: 10px;
  transition: background-color var(--transition), color var(--transition);
}

.top-nav a.active,
.top-nav a:hover,
.top-nav a:focus-visible {
  color: var(--text);
  background: #eef2f7;
  outline: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.2rem 1rem 2.2rem;
}

.hero {
  grid-template-columns: 1.2fr 1fr;
  gap: 1rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 1.2rem;
}

.hero h1 { margin: 0 0 0.6rem; font-size: clamp(1.5rem, 2.5vw, 2.3rem); }
.hero p { margin: 0; color: var(--muted); }

.quick-links {
  display: grid;
  gap: 0.65rem;
  margin-top: 0.9rem;
}

.quick-links a {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
  transition: transform var(--transition), border-color var(--transition);
}

.quick-links a:hover { transform: translateX(3px); border-color: #c3cedd; }

.stats { display: grid; gap: 0.7rem; }
.stats .item {
  border-radius: 10px;
  padding: 0.75rem;
  border: 1px solid var(--line);
  background: #fbfcfe;
}

.layout-archive {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 1rem;
}

aside.timeline-pane {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 1rem 0.8rem;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  position: sticky;
  top: 76px;
}

.timeline-title {
  margin: 0 0 0.8rem;
  color: var(--accent);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; }
.timeline a {
  text-decoration: none;
  display: flex;
  gap: 0.5rem;
  padding: 0.55rem 0.65rem;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: transform var(--transition), background-color var(--transition), border-color var(--transition);
}
.timeline a .year { color: var(--muted); min-width: 3rem; }
.timeline a:hover,
.timeline a:focus-visible {
  background: #f2f5fa;
  border-color: #d4dce8;
  transform: translateX(3px);
  outline: none;
}

.search-wrap { margin: 0.9rem; }
.search-wrap input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  font-size: 0.97rem;
}
.search-wrap input:focus { outline: none; border-color: #b7c4d9; }

.accordion { display: grid; gap: 0.8rem; }
.treaty-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.treaty-card:hover { transform: translateY(-2px); }
.treaty-card[data-color="green"] { border-left-color: var(--green); }
.treaty-card[data-color="blue"] { border-left-color: var(--blue); }
.treaty-card[data-color="purple"] { border-left-color: var(--purple); }

.accordion-toggle {
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  padding: 0.95rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.meta { display: flex; gap: 0.7rem; align-items: baseline; }
.meta .year { color: var(--muted); font-size: 0.92rem; }
.arrow { color: var(--muted); transition: transform var(--transition), color var(--transition); }
.treaty-card.active .arrow { transform: rotate(90deg); color: var(--accent); }

.accordion-content {
  max-height: 0;
  overflow: hidden;
  border-top: 1px solid #edf1f6;
  transition: max-height 0.35s ease;
}
.content-inner { padding: 0.9rem 1rem 1rem; color: #2a3442; }

.person { color: #ba8b00; }
.treaty-text { color: var(--green); }
.treaty-history { color: var(--blue); }
.person, .treaty-text, .treaty-history {
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.extras-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}
.extras-grid article { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 0.85rem; }

section.block-spaced { margin-top: 1rem; }
.cards-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.8rem; }
.hidden { display: none; }

footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 960px) {
  .hero, .cards-3, .extras-grid { grid-template-columns: 1fr; }
  .layout-archive { grid-template-columns: 1fr; }
  aside.timeline-pane { position: relative; top: 0; max-height: 240px; }
}


.content-inner a { text-decoration-thickness: 1.5px; }
.content-inner a:hover { opacity: 0.8; }