@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(20, 20, 35, 0.7);
  --border-glow: rgba(100, 100, 255, 0.15);
  --text-primary: #e8e8f0;
  --text-secondary: #8888a0;
  --text-muted: #555570;
  --accent: #6366f1;
  --military: #ef4444;
  --diplomacy: #eab308;
  --ceasefire: #22c55e;
  --nuclear: #3b82f6;
  --protest: #a855f7;
  --leadership: #f97316;
  --gradient-1: linear-gradient(135deg, #1a1a2e 0%, #0a0a0f 100%);
  --glass: rgba(255,255,255,0.03);
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ─── Hero ─── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  background: radial-gradient(ellipse at 50% 30%, rgba(99,102,241,0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 80%, rgba(239,68,68,0.08) 0%, transparent 50%),
              var(--bg-primary);
}
.hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 200px;
  background: linear-gradient(to top, var(--bg-primary), transparent);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--military);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  animation: pulse-border 2s infinite;
}
@keyframes pulse-border {
  0%, 100% { border-color: rgba(239,68,68,0.3); }
  50% { border-color: rgba(239,68,68,0.6); }
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 0%, #8888a0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero h1 span {
  background: linear-gradient(135deg, var(--military), #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 2rem;
}
.hero-stats {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2.5rem;
}
.hero-stat {
  text-align: center;
  padding: 1rem 1.5rem;
  background: var(--glass);
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  backdrop-filter: blur(10px);
}
.hero-stat .number {
  font-size: 1.8rem;
  font-weight: 800;
  color: #fff;
}
.hero-stat .label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.scroll-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  animation: float 3s ease-in-out infinite;
  cursor: pointer;
  z-index: 1;
}
.scroll-cta .arrow {
  width: 24px; height: 24px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(45deg);
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* ─── Filters ─── */
.filters-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.8rem 2rem;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}
.filter-btn {
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.1);
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.filter-btn:hover { border-color: rgba(255,255,255,0.25); color: #fff; }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.filter-btn .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  display: inline-block;
}

/* ─── Timeline ─── */
.timeline-section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
  position: relative;
}
.phase-header {
  text-align: center;
  margin: 4rem 0 2rem;
  position: relative;
}
.phase-header:first-child { margin-top: 0; }
.phase-label {
  display: inline-block;
  padding: 0.4rem 1.2rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.phase-header h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
}
.phase-header .phase-dates {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.timeline {
  position: relative;
  padding: 2rem 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--border-glow) 5%, var(--border-glow) 95%, transparent);
  transform: translateX(-50%);
}

/* ─── Event Cards ─── */
.event {
  display: flex;
  align-items: flex-start;
  margin-bottom: 2.5rem;
  position: relative;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.event.visible {
  opacity: 1;
  transform: translateY(0);
}
.event.hidden-by-filter {
  display: none !important;
}
.event:nth-child(odd) { flex-direction: row; }
.event:nth-child(even) { flex-direction: row-reverse; }

.event-content {
  width: calc(50% - 30px);
  padding: 1.2rem 1.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 14px;
  backdrop-filter: blur(10px);
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
}
.event-content:hover {
  border-color: rgba(150,150,255,0.3);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}
.event-content::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: 14px 14px 0 0;
}
.event[data-category="military"] .event-content::before { background: var(--military); }
.event[data-category="diplomacy"] .event-content::before { background: var(--diplomacy); }
.event[data-category="ceasefire"] .event-content::before { background: var(--ceasefire); }
.event[data-category="nuclear"] .event-content::before { background: var(--nuclear); }
.event[data-category="protest"] .event-content::before { background: var(--protest); }
.event[data-category="leadership"] .event-content::before { background: var(--leadership); }

.event-dot {
  position: absolute;
  left: 50%;
  top: 1.4rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  transform: translateX(-50%);
  z-index: 2;
  transition: transform 0.3s, box-shadow 0.3s;
}
.event:hover .event-dot {
  transform: translateX(-50%) scale(1.3);
  box-shadow: 0 0 12px var(--accent);
}
.event[data-category="military"] .event-dot { background: var(--military); }
.event[data-category="diplomacy"] .event-dot { background: var(--diplomacy); }
.event[data-category="ceasefire"] .event-dot { background: var(--ceasefire); }
.event[data-category="nuclear"] .event-dot { background: var(--nuclear); }
.event[data-category="protest"] .event-dot { background: var(--protest); }
.event[data-category="leadership"] .event-dot { background: var(--leadership); }

.event-date {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
}
.event-cat-badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}
.event[data-category="military"] .event-cat-badge { background: rgba(239,68,68,0.15); color: var(--military); }
.event[data-category="diplomacy"] .event-cat-badge { background: rgba(234,179,8,0.15); color: var(--diplomacy); }
.event[data-category="ceasefire"] .event-cat-badge { background: rgba(34,197,94,0.15); color: var(--ceasefire); }
.event[data-category="nuclear"] .event-cat-badge { background: rgba(59,130,246,0.15); color: var(--nuclear); }
.event[data-category="protest"] .event-cat-badge { background: rgba(168,85,247,0.15); color: var(--protest); }
.event[data-category="leadership"] .event-cat-badge { background: rgba(249,115,22,0.15); color: var(--leadership); }

.event-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: #fff;
}
.event-summary {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.event-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, margin 0.3s;
}
.event-detail.open {
  max-height: 500px;
  margin-top: 0.8rem;
}
.event-detail-inner {
  padding-top: 0.8rem;
  border-top: 1px solid var(--border-glow);
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.event-source {
  margin-top: 0.5rem;
  font-size: 0.65rem;
  color: var(--text-muted);
  font-style: italic;
}
.expand-hint {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
  transition: color 0.2s;
}
.event-content:hover .expand-hint { color: var(--accent); }

/* ─── Footer ─── */
footer {
  text-align: center;
  padding: 3rem 2rem;
  border-top: 1px solid var(--border-glow);
  color: var(--text-muted);
  font-size: 0.75rem;
}
footer p { margin-bottom: 0.3rem; }
footer .sources { max-width: 700px; margin: 0.8rem auto 0; font-size: 0.65rem; line-height: 1.8; }

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .timeline::before { left: 20px; }
  .event, .event:nth-child(odd), .event:nth-child(even) {
    flex-direction: row !important;
    padding-left: 45px;
  }
  .event-content { width: 100%; }
  .event-dot { left: 20px !important; }
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 1rem; }
  .hero-stat { padding: 0.7rem 1rem; }
  .hero-stat .number { font-size: 1.3rem; }
  .filters-bar { padding: 0.6rem 1rem; }
}