/* timeline.css */

/* Container for timeline */
#timeline-container {
  display: flex;
  width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Left Nav */
#epoch-nav {
  position: fixed;
  top: 80px;
  left: 20px;
  width: 240px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  background-color: var(--white);
  border: 1px solid #ccc;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  padding: var(--spacing-md);
  z-index: 10;
}
#epoch-nav h2 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-md);
  color: #333;
}

/* Epoch & Subepoch Buttons */
.epoch-item {
  margin-bottom: var(--spacing-sm);
}
.epoch-btn {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  margin-bottom: var(--spacing-xs);
  padding: var(--spacing-sm);
  border-left: 6px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  color: #333;
  font-weight: 600;
  background-color: #f9f9f9;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
  outline: none;
}
.epoch-btn:hover {
  background-color: #f2f2f2;
}
.epoch-btn.active {
  background-color: #ebebeb;
  border-left-color: var(--brand-color);
}

.subepoch-list {
  margin-left: var(--spacing-sm);
  padding-left: var(--spacing-sm);
  border-left: 3px solid #ddd;
  display: none;
}
.epoch-item.active .subepoch-list {
  display: block;
}
.subepoch-btn {
  display: block;
  width: 100%;
  border: none;
  margin-bottom: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-left: 4px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  color: #333;
  background-color: #fafafa;
  font-size: 0.9rem;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}
.subepoch-btn:hover {
  background-color: #f1f1f1;
}
.subepoch-btn.active {
  background-color: #e7e7e7;
  border-left-color: var(--brand-color);
}

/* Timeline content */
#timeline-content {
  margin-left: 260px;
  width: calc(100% - 260px);
  position: relative;
  padding: var(--spacing-lg) var(--spacing-md);
  overflow-x: hidden;
}

/* Central timeline line */
#timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  width: 4px;
  height: 100%;
  background-color: var(--brand-color);
  transform: translateX(-50%);
  z-index: 1;
}

/* Wrapper for all epoch blocks */
#timeline-wrapper {
  position: relative;
  width: 100%;
}

/* ===================== EPOCH BLOCK ===================== */
.epoch-block {
  position: relative;
  margin-bottom: calc(var(--spacing-xl) * 7.5);
  padding-bottom: var(--spacing-md);
  text-align: center;
}

/* EPOCH HEADER */
.epoch-header {
  margin-bottom: var(--spacing-md);
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 6px;
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  z-index: 2;
  position: relative;
}
.epoch-title {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: var(--spacing-xs);
  color: #444;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.15);
}
.epoch-timeframe {
  font-size: 1rem;
  color: #666;
  opacity: 0.9;
}

/* SUB-EPOCH BOX */
.subepoch-block {
  position: relative;
  width: 25%;
  margin: calc(var(--spacing-xl) * 1.5) auto; 
  background-color: #fbf8ff;
  border: 2px solid rgba(0,0,0,0.06);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  padding: var(--spacing-md);
  z-index: 5;
  text-align: center;
}
.subepoch-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: #333;
}
.subepoch-timeframe {
  font-size: 0.9rem;
  opacity: 0.7;
  margin-bottom: var(--spacing-xs);
  color: #666;
}
.subepoch-description {
  font-size: 0.9rem;
  color: #444;
  line-height: 1.4;
}

/* ===================== EVENT BLOCK ===================== */
.event-wrapper {
  position: relative;
  width: 40%;
  margin: var(--spacing-sm) 0;
  border-radius: 6px;
  box-shadow: none;
  cursor: pointer;
  transition: transform 0.3s;
  z-index: 2;
  overflow: visible;
  background: none;
  padding: 0;
}
.event-content {
  position: relative;
  z-index: 2;
  width: 100%;
  box-sizing: border-box;
  padding: 8px; /* your 8px padding here */
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  transition: transform 0.3s;
}
.event-wrapper:hover .event-content {
  transform: scale(1.03);
}
.event-left {
  margin-right: auto;
  position: relative; 
  text-align: right;
}
.event-right {
  margin-left: auto;
  position: relative;
  text-align: left;
}
.event-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
  color: #333;
}
.event-date {
  font-style: italic;
  font-size: 0.85rem;
  margin-bottom: var(--spacing-xs);
  color: #666;
}
.event-description {
  font-size: 0.85rem;
  line-height: 1.4;
  color: #444;
}

/* CONNECTOR & DOT */
.connector-line {
  position: absolute;
  top: 28px;
  height: 4px;
  background-color: #888;
  z-index: 1;
  transition: none;
}
.event-dot {
  position: absolute;
  top: 24px;
  width: 30px;
  height: 30px;
  border: 3px solid #fff;
  border-radius: 50%;
  z-index: 1;
  transition: none;
}
/* The line from the event box to the timeline */
.event-left .connector-line {
  position: absolute;
  top: 25%;
  left: 125%;
  transform: translate(-100%, -50%);
  width: 25%;
  height: 4px;
  background-color: #666;
  transition: background-color 0.3s;
}
.event-left .event-dot {
  position: absolute;
  top: 25%;
  left: 125%;
  transform: translate(-50%, -50%); 
  width: 24px;
  height: 24px;
  border: 3px solid #fff;
  border-radius: 50%;
  background-color: #ff5b5b;
  z-index: 2;
  transition: transform 0.3s;
}

.event-right .connector-line {
  position: absolute;
  top: 25%;
  right: 125%;
  transform: translate(100%, -50%);
  width: 25%;
  height: 4px;
  background-color: #666;
  transition: background-color 0.3s;
}
.event-right .event-dot {
  position: absolute;
  top: 25%;
  right: 125%;
  transform: translate(50%, -50%);
  width: 24px;
  height: 24px;
  border: 3px solid #fff;
  border-radius: 50%;
  background-color: #ff5b5b;
  z-index: 2;
  transition: transform 0.3s;
}

/* ========== OVERLAY ========== */
#event-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}
#event-overlay.hidden {
  display: none;
}
.overlay-content {
  background-color: var(--white);
  padding: var(--spacing-lg);
  width: 90%;
  max-width: 800px;
  border-radius: 8px;
  position: relative;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  max-height: 90vh;
  overflow-y: auto;
}
.close-btn {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  font-size: 2rem;
  cursor: pointer;
  color: #333;
}
#overlay-details h2 {
  margin-bottom: var(--spacing-sm);
}
#overlay-details img {
  max-width: 100%;
  height: auto;
  margin: var(--spacing-md) 0;
  display: block;
  border-radius: 6px;
}
.extended-desc {
  margin-top: var(--spacing-sm);
  font-size: 0.95rem;
  line-height: 1.4;
  color: #333;
}