:root {
  --bg: radial-gradient(circle at top left, #1e293b 0%, #0f172a 60%, #020617 100%);
  --surface: rgba(15, 23, 42, 0.85);
  --surface-strong: rgba(15, 23, 42, 0.95);
  --card-bg: rgba(30, 41, 59, 0.8);
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.2);
  --text-primary: #f8fafc;
  --text-muted: #94a3b8;
  --border: rgba(148, 163, 184, 0.25);
  --shadow: 0 40px 70px -35px rgba(15, 23, 42, 0.9);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  overflow: hidden;
}

.site-container {
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 3rem 5vw 2rem;
}

.app-header h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.app-header p {
  margin: 0;
  max-width: 42ch;
  color: var(--text-muted);
  line-height: 1.6;
}

.layout {
  display: grid;
  gap: 2.5rem;
  padding: 0 5vw 3rem;
  flex: 1;
}

.timeline-shell {
  position: relative;
  padding-bottom: 2.5rem;
  overflow: hidden;
}

.timeline-shell::after {
  content: "";
  position: absolute;
  inset: auto 0 2.2rem 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(148, 163, 184, 0.3) 15%,
    rgba(148, 163, 184, 0.3) 85%,
    transparent 100%
  );
  pointer-events: none;
}

.timeline-scroll {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 1rem 0.75rem 2.5rem;
  scroll-snap-type: x proximity;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(56, 189, 248, 0.4);
  border-radius: 999px;
  transition: background 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(56, 189, 248, 0.6);
}

::-webkit-scrollbar-thumb:active {
  background: rgba(56, 189, 248, 0.8);
}

/* Firefox scrollbar styling */
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(56, 189, 248, 0.4) transparent;
}

.timeline-node {
  position: relative;
  min-width: clamp(190px, 24vw, 260px);
  border-radius: 24px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: inherit;
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  cursor: pointer;
  scroll-snap-align: center;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  text-align: left;
  box-shadow: var(--shadow);
}

.timeline-node::before {
  content: "";
  position: absolute;
  inset: auto 50% -1.65rem;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft);
}

.timeline-node .date {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.timeline-node .headline {
  font-size: 1.05rem;
  line-height: 1.45;
  font-weight: 600;
}

.timeline-node .summary {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.timeline-node.is-active {
  border-color: var(--accent);
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 25px 60px -25px rgba(56, 189, 248, 0.75);
}

.timeline-node.is-active::before {
  box-shadow: 0 0 0 10px rgba(56, 189, 248, 0.3);
}

.details-panel {
  background: var(--surface-strong);
  border-radius: 30px;
  padding: 2.2rem;
  border: 1px solid rgba(56, 189, 248, 0.18);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  box-shadow: var(--shadow);
  overflow-y: auto;
  max-height: 70vh;
}

.details-panel .day-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: baseline;
}

.details-panel .day-header h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
}

.details-panel .day-header span {
  color: var(--text-muted);
}

.details-panel .lead {
  margin: 0;
  font-size: 1.05rem;
  color: rgba(248, 250, 252, 0.85);
  line-height: 1.6;
}

.event-list {
  display: grid;
  gap: 1.25rem;
}

.event-card {
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 24px;
  padding: 1.5rem;
  display: grid;
  gap: 0.85rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.event-card:hover {
  border-color: rgba(56, 189, 248, 0.45);
  transform: translateY(-2px);
}

.event-card h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.5;
}

.event-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.6;
}

.event-card a {
  justify-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}

.event-card a:hover {
  text-decoration: underline;
}

.event-card a::after {
  content: "↗";
  font-size: 0.9rem;
}

.app-footer {
  padding: 2rem 5vw 3rem;
  color: rgba(148, 163, 184, 0.7);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .app-header {
    padding: 2.5rem 1.5rem 1.5rem;
  }

  .layout {
    padding: 0 1.5rem 2rem;
  }

  .timeline-node {
    min-width: 80vw;
  }

  .details-panel {
    padding: 1.75rem;
  }
}