#chart-svg { position: absolute; top: 0; left: 0; overflow: visible; }
#overlay { position: absolute; top: 0; left: 0; }

#world {
  background:
    repeating-linear-gradient(90deg, transparent 0 199px, rgba(107,91,75,.07) 199px 200px),
    linear-gradient(135deg, #f5e6c8, #eedcb5 25%, #f0e2c4 50%, #e8d5a8 75%, #f2e4c0);
  border: 3px solid var(--border-ornate);
  box-shadow: inset 0 0 80px rgba(42,31,20,.15);
}

.century-line { stroke: rgba(42,31,20,.13); stroke-width: 1; }
.century-line.major { stroke: rgba(42,31,20,.22); stroke-width: 2; }

.century-label {
  position: absolute; transform: translateX(-50%);
  font-family: var(--font-display); font-size: 11px; font-weight: 700;
  color: var(--ink-light); white-space: nowrap; pointer-events: none;
  text-shadow: 1px 1px 2px rgba(240,226,196,.9);
}
.century-label.major { font-size: 13px; color: var(--red-accent); }

.era-banner {
  position: absolute; top: 30px; height: 22px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 10px; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase; color: rgba(255,255,255,.95);
  text-shadow: 0 1px 2px rgba(0,0,0,.5); pointer-events: none;
  border: 1px solid rgba(255,255,255,.15); border-radius: 3px;
}

.region-label {
  position: absolute; left: 6px;
  font-family: var(--font-display); font-size: 11px; font-weight: 900;
  letter-spacing: 3px; text-transform: uppercase; color: var(--ink-faint);
  writing-mode: vertical-rl; transform: rotate(180deg); pointer-events: none;
}

/* Ríos */
.river-connector { opacity: .45; pointer-events: none; }
.river { cursor: pointer; transition: filter .18s; }
.river:hover { filter: brightness(1.12) saturate(1.15); }
.civ-label {
  position: absolute; font-family: var(--font-label); font-size: 11px; font-weight: 600;
  color: rgba(255,255,255,.96); text-shadow: 0 1px 3px rgba(0,0,0,.7);
  white-space: nowrap; pointer-events: none; transform: translateY(-50%);
}
.civ-label.dark { color: rgba(0,0,0,.82); text-shadow: 0 1px 2px rgba(255,255,255,.5); }

/* Marcadores de evento */
.event-marker { position: absolute; width: 9px; height: 9px; border-radius: 50%;
  background: var(--red-accent); border: 1.5px solid var(--gold); cursor: pointer; z-index: 8;
  transform: translate(-50%,-50%); transition: transform .18s, box-shadow .18s; }
.event-marker:hover { transform: translate(-50%,-50%) scale(2); box-shadow: 0 0 12px rgba(139,26,26,.6); z-index: 20; }
.event-marker.golden { background: var(--gold); border-color: var(--gold-light); width: 11px; height: 11px; }