/* ==========================================================================
   Interactive Timeline — core styles
   Pure CSS, no build step, no framework. Themeable via the custom
   properties in :root — change colors there and everything follows.

   Palette: mostly white / light grey, with two brand accents —
   blue rgb(0, 34, 99) and orange #FF5300. The animated background
   (bg-swoop.css/js) paints behind everything at z-index 0; the app UI
   sits above it at z-index 1 with mostly-transparent midground panels
   so the swoop reads through in the timeline viewport.
   ========================================================================== */

:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --panel-alt: #f1f2f5;
  --panel-border: #e3e5ea;
  --text: #17203a;
  --text-dim: #5b6478;
  --text-faint: #9aa1b0;
  --blue: rgb(0, 34, 99);
  --blue-soft: rgba(0, 34, 99, 0.08);
  --orange: #ff5300;
  --accent: var(--blue);
  --accent-2: var(--orange);
  --axis: #dadde5;
  --shadow: 0 12px 32px -16px rgba(0, 34, 99, 0.22);
  --shadow-sm: 0 4px 16px -10px rgba(0, 34, 99, 0.2);
  --radius: 14px;
  --radius-sm: 9px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --card-w: 260px;
  --lane-gap: 18px;
  --card-gap: 46px;

  /* motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 0.15s;
  --dur: 0.28s;
  --dur-slow: 0.42s;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: var(--font);
  background: linear-gradient(180deg, #ffffff 0%, #f5f6f9 100%);
  color: var(--text);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ---------------------------------------------------------------- header */

.app-header {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 16px 26px;
  border-bottom: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  z-index: 20;
}

.app-header .titles { margin-right: auto; min-width: 220px; }

.app-header h1 {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--blue) 0%, var(--blue) 55%, var(--orange) 160%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.app-header .subtitle {
  margin: 2px 0 0;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-box input {
  background: var(--panel-alt);
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 14px 9px 34px;
  font-size: 0.85rem;
  width: 190px;
  transition: width var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.search-box input:focus {
  outline: none;
  border-color: var(--blue);
  background: var(--panel);
  width: 240px;
}

.search-box svg {
  position: absolute;
  left: 12px;
  width: 14px;
  height: 14px;
  color: var(--text-faint);
  pointer-events: none;
}

.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--panel-alt);
  color: var(--text-dim);
  font-size: 0.78rem;
  cursor: pointer;
  user-select: none;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease),
    background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
  white-space: nowrap;
}

.filter-chip .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}

.filter-chip.active {
  color: var(--text);
  border-color: var(--chip-color, var(--blue));
  background: color-mix(in srgb, var(--chip-color, var(--blue)) 14%, var(--panel));
}

.filter-chip:hover {
  border-color: var(--chip-color, var(--blue));
  color: var(--text);
  transform: translateY(-1px);
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--panel-alt);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 4px;
}

.zoom-controls button {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.zoom-controls button:hover { background: var(--panel); color: var(--blue); }
.zoom-controls .zoom-label { font-size: 0.72rem; color: var(--text-faint); padding: 0 6px; min-width: 40px; text-align: center; }

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--panel-border);
  background: var(--panel-alt);
  color: var(--text-dim);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.icon-btn:hover { color: var(--blue); border-color: var(--blue); transform: translateY(-1px); }
.icon-btn svg { width: 16px; height: 16px; }

/* --------------------------------------------------------------- viewport */

.timeline-viewport {
  position: relative;
  flex: 1;
  overflow: hidden;
  cursor: grab;
}

.timeline-viewport.grabbing { cursor: grabbing; }

.timeline-viewport.dragging .event-card,
.timeline-viewport.dragging .era-band { pointer-events: none; }

.timeline-track {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  will-change: transform;
}

.timeline-track.animated-pan {
  transition: transform var(--dur-slow) var(--ease);
}

/* fade masks at each edge so content doesn't hard-clip */
.viewport-fade {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 90px;
  pointer-events: none;
  z-index: 15;
}
.viewport-fade.left { left: 0; background: linear-gradient(90deg, var(--bg) 0%, transparent 100%); }
.viewport-fade.right { right: 0; background: linear-gradient(270deg, var(--bg) 0%, transparent 100%); }

/* year ruler */

.axis-line {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--axis) 4%, var(--axis) 96%, transparent 100%);
  top: 50%;
  transform: translateY(-1px);
}

.tick {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
  z-index: 1;
}

.tick .tick-mark {
  width: 1px;
  height: 34px;
  background: var(--axis);
}

.tick .tick-label {
  position: absolute;
  top: 24px;
  font-size: 0.72rem;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.tick.major .tick-mark { height: 46px; background: #b9bfcd; }
.tick.major .tick-label { color: var(--text-dim); font-weight: 600; top: 30px; }

/* era bands */

.era-band {
  position: absolute;
  top: 50%;
  height: 52px;
  transform: translateY(-50%);
  border-radius: 999px;
  background: color-mix(in srgb, var(--era-color, var(--blue)) 10%, var(--panel));
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.era-band:hover {
  background: color-mix(in srgb, var(--era-color, var(--blue)) 58%, var(--panel));
  transform: translateY(-50%) translateY(-1px);
}

.era-band .era-label {
  position: absolute;
  top: -30px;
  left: 16px;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--era-color, var(--blue));
  white-space: nowrap;
}

/* event nodes + cards */

.event-node {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--node-color, var(--blue));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--node-color, var(--blue)) 18%, transparent);
  cursor: pointer;
  z-index: 5;
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.event-node:hover {
  transform: translate(-50%, -50%) scale(1.3);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--node-color, var(--blue)) 22%, transparent);
}

.event-stem {
  position: absolute;
  width: 2px;
  background: var(--axis);
  z-index: 2;
}

.event-card {
  position: absolute;
  width: var(--card-w);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  z-index: 6;
}

.event-card:hover {
  transform: translateY(-3px);
  border-color: var(--node-color, var(--blue));
  box-shadow: 0 18px 36px -18px color-mix(in srgb, var(--node-color, var(--blue)) 55%, transparent);
}

.event-card .card-date {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--node-color, var(--blue));
  text-transform: uppercase;
}

.event-card .card-title {
  margin: 4px 0 2px;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
}

.event-card .card-desc {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.event-card .card-media-badge {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.68rem;
  color: var(--text-faint);
}
.event-card .card-media-badge svg { width: 12px; height: 12px; }

.event-card.dimmed { opacity: 0.32; filter: grayscale(0.5); }
.event-node.dimmed { opacity: 0.32; }
.era-band.dimmed { opacity: 0.3; }

.event-card.dimmed,
.event-node.dimmed,
.era-band.dimmed {
  transition: opacity var(--dur) var(--ease), filter var(--dur) var(--ease);
}

/* start / end caps */

.timeline-cap {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  pointer-events: none;
}

.timeline-cap.cap-start { flex-direction: row; }
.timeline-cap.cap-end { flex-direction: row; }

.timeline-cap .cap-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-faint);
}

.timeline-cap.cap-end .cap-dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 83, 0, 0.16);
  animation: pulse 2.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(255, 83, 0, 0.16); }
  50% { box-shadow: 0 0 0 9px rgba(255, 83, 0, 0.04); }
}

.timeline-cap .cap-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
}

.timeline-cap.cap-end .cap-text {
  color: var(--orange);
  font-style: italic;
}

.cap-trail {
  width: 140px;
  height: 2px;
  background-image: linear-gradient(90deg, var(--axis) 40%, transparent 0%);
  background-size: 10px 2px;
  background-repeat: repeat-x;
}

/* ------------------------------------------------------------- minimap */

.minimap {
  position: relative;
  height: 64px;
  border-top: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  padding: 0 26px;
  display: flex;
  align-items: center;
}

.minimap-track {
  position: relative;
  width: 100%;
  height: 30px;
  background: var(--panel-alt);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  cursor: pointer;
}

.minimap-mark {
  position: absolute;
  top: 50%;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--node-color, var(--blue));
  opacity: 0.85;
}

.minimap-viewport {
  position: absolute;
  top: -1px;
  bottom: -1px;
  border: 2px solid var(--blue);
  border-radius: 999px;
  background: rgba(0, 34, 99, 0.06);
  cursor: grab;
  min-width: 24px;
  transition: background var(--dur-fast) var(--ease);
}
.minimap-viewport:active { cursor: grabbing; }

.minimap-years {
  position: absolute;
  bottom: 4px;
  left: 26px;
  right: 26px;
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-faint);
  pointer-events: none;
}

/* -------------------------------------------------------------- modal */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 16, 34, 0.42);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }

.modal-card {
  width: min(680px, 92vw);
  max-height: 86vh;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 28px;
  transform: translateY(16px) scale(0.98);
  transition: transform var(--dur-slow) var(--ease);
}
.modal-overlay.open .modal-card { transform: translateY(0) scale(1); }

.modal-card .modal-close {
  float: right;
  margin-left: 12px;
}

.modal-card .modal-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--modal-color, var(--blue));
}
.modal-card .modal-eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: currentColor; }

.modal-card h2 {
  margin: 10px 0 4px;
  font-size: 1.5rem;
  color: var(--text);
}

.modal-card .modal-date {
  margin: 0 0 16px;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.modal-card .modal-desc {
  color: var(--text);
  line-height: 1.6;
  font-size: 0.95rem;
  white-space: pre-line;
}

.modal-media {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

.modal-media figure {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--panel-border);
  background: #0d1120;
}

.modal-media img,
.modal-media video {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  background: #0d1120;
}

.embed-wrap {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  background: #0d1120;
}
.embed-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}
.embed-wrap .embed-broken {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 20px;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.85rem;
}

.modal-media figcaption {
  padding: 8px 12px;
  font-size: 0.78rem;
  color: var(--text-dim);
  background: var(--panel-alt);
}

.modal-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--panel-border);
}

.modal-nav button {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.82rem;
  cursor: pointer;
  padding: 6px 4px;
  transition: color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.modal-nav button:hover:not(:disabled) { color: var(--blue); }
.modal-nav button:disabled { opacity: 0.3; cursor: default; }

/* --------------------------------------------------------------- empty */

.empty-state {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  color: var(--text-faint);
  text-align: center;
  padding: 20px;
  background: var(--bg);
  z-index: 200;
}

/* --------------------------------------------------------------- misc */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.hint {
  position: absolute;
  bottom: 76px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  border: 1px solid var(--panel-border);
  padding: 6px 14px;
  border-radius: 999px;
  pointer-events: none;
  opacity: 1;
  transition: opacity var(--dur-slow) var(--ease);
  z-index: 30;
}
.hint.hidden { opacity: 0; }

/* ==========================================================================
   Mobile layout (<= 760px)
   A vertical feed (earliest at top, latest at bottom) with a persistent
   scrubber rail docked to the right edge. Both this and the desktop `.app`
   are always in the DOM; this media query is the only thing deciding which
   one is visible, so rotating a tablet or resizing needs no reload.
   ========================================================================== */

.mobile-app { display: none; }

@media (max-width: 760px) {
  .app { display: none; }
  .mobile-app { display: flex; }
}

.mobile-app {
  position: relative;
  z-index: 1;
  flex-direction: column;
  height: 100dvh;
  height: 100vh;
}

.mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  padding-top: max(14px, env(safe-area-inset-top));
  border-bottom: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  flex: none;
}

.m-titles h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--blue);
}

.m-subtitle {
  margin: 2px 0 0;
  font-size: 0.72rem;
  color: var(--text-dim);
}

.mobile-filters {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px 16px;
  border-bottom: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.92);
  flex: none;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.mobile-filters::-webkit-scrollbar { display: none; }
.mobile-filters .filter-chip { flex: none; }

.mobile-search-bar {
  max-height: 0;
  overflow: hidden;
  padding: 0 16px;
  border-bottom: 1px solid transparent;
  background: rgba(255, 255, 255, 0.92);
  transition: max-height var(--dur) var(--ease), padding var(--dur) var(--ease);
  flex: none;
}
.mobile-search-bar.open {
  max-height: 60px;
  padding: 10px 16px;
  border-bottom-color: var(--panel-border);
}
.mobile-search-bar input {
  width: 100%;
  background: var(--panel-alt);
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 0.88rem;
  transition: border-color var(--dur-fast) var(--ease);
}
.mobile-search-bar input:focus { outline: none; border-color: var(--blue); }

.mobile-body {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.mobile-list {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
  padding: 20px 16px 40px 14px;
}

.mobile-track {
  position: relative;
  padding-left: 34px;
}

.mobile-track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--axis);
}

.m-row {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
}

.m-row-marker {
  position: absolute;
  left: -34px;
  top: 4px;
  width: 34px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.m-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--node-color, var(--blue));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--node-color, var(--blue)) 18%, transparent);
}

.m-card {
  flex: 1;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.m-row:active .m-card { border-color: var(--node-color, var(--blue)); transform: scale(0.99); }

.m-row.dimmed { opacity: 0.4; transition: opacity var(--dur) var(--ease); }

.m-spacer {
  position: relative;
  width: 100%;
}

.m-gap-label {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.66rem;
  color: var(--text-faint);
  background: var(--bg);
  border: 1px solid var(--panel-border);
  padding: 3px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.m-era-row {
  position: relative;
  margin-left: -34px;
  width: calc(100% + 34px);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  background: color-mix(in srgb, var(--era-color, var(--blue)) 12%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--era-color, var(--blue)) 35%, transparent);
  border-left: 4px solid var(--era-color, var(--blue));
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease);
}
.m-era-row.dimmed { opacity: 0.4; }

.m-era-title {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--era-color, var(--blue));
}

.m-era-range {
  font-size: 0.7rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.m-cap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 0 22px;
  text-align: center;
}
.m-cap .cap-text { font-size: 0.82rem; font-weight: 600; color: var(--text-dim); }
.m-cap.cap-end .cap-text { color: var(--orange); font-style: italic; }

.m-cap-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-faint);
}
.m-cap.cap-end .m-cap-dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 83, 0, 0.16);
  animation: pulse 2.2s ease-in-out infinite;
}

/* ---------------------------------------------------------------- rail */

.mobile-rail {
  width: 60px;
  flex: none;
  position: relative;
  border-left: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.92);
  padding-bottom: env(safe-area-inset-bottom);
}

.rail-track {
  position: absolute;
  top: 16px;
  bottom: 30px;
  left: 0;
  right: 0;
}

.rail-axis {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--axis);
  transform: translateX(-50%);
}

.rail-tick {
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}
.rail-tick-mark {
  width: 8px;
  height: 2px;
  background: #b9bfcd;
  transform: translateX(-50%);
}

.rail-dot {
  position: absolute;
  left: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--node-color, var(--blue));
  transform: translate(-50%, -50%);
  z-index: 1;
  opacity: 0.9;
}

.rail-thumb {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 34px;
  min-height: 28px;
  border-radius: 999px;
  border: 2px solid var(--blue);
  background: rgba(0, 34, 99, 0.06);
  z-index: 2;
  cursor: grab;
}
.rail-thumb:active { cursor: grabbing; }

.rail-bubble {
  position: absolute;
  right: calc(100% + 10px);
  transform: translateY(-50%);
  background: var(--blue);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 8px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease);
  z-index: 3;
}
.rail-bubble::after {
  content: "";
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 5px solid transparent;
  border-left-color: var(--blue);
}
.rail-bubble.visible { opacity: 1; }

.rail-years {
  position: absolute;
  top: 2px;
  bottom: 8px;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  font-size: 0.62rem;
  color: var(--text-faint);
  pointer-events: none;
}

/* ------------------------------------------------------- shared modal
   The modal DOM is shared with desktop; on mobile it becomes a bottom
   sheet that slides up and can be swiped down to dismiss. */

.sheet-handle { display: none; }

@media (max-width: 760px) {
  .modal-overlay { align-items: flex-end; background: rgba(10, 16, 34, 0.36); }
  .modal-card {
    width: 100%;
    max-height: 88vh;
    border-radius: 20px 20px 0 0;
    padding: 10px 20px 24px;
    padding-bottom: max(24px, env(safe-area-inset-bottom));
    transform: translateY(100%);
  }
  .modal-overlay.open .modal-card { transform: translateY(0); }
  .modal-card.dragging { transition: none; }
  .sheet-handle {
    display: block;
    width: 40px;
    height: 4px;
    border-radius: 999px;
    background: var(--panel-border);
    margin: 4px auto 14px;
  }
  .modal-card .modal-close { position: absolute; top: 14px; right: 16px; }
  .modal-card h2 { font-size: 1.3rem; }
}