/* Time-labeled chapter timelines — one visual system per [data-variant]
   Typography aligned with pulse-article.css + DESIGN_SYSTEM.md:
   — Primary reading / nav labels: Space Grotesk (--font-primary), ~14–17px
   — Mono labels/captions: DM Mono, minimum 12px (no 8–9px micro type)
   — Comfortable line-height for 45+ readers */

.demo-timeline-mount {
  --tl-range: clamp(14px, 1.2vw, 17px);
  --tl-mono: clamp(12px, 0.95vw, 14px);
  --tl-title: clamp(14px, 1.05vw, 16px);
  --tl-cap: clamp(13px, 0.9vw, 15px);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.tl-mount--ghost {
  height: 0;
  margin: 0 !important;
  padding: 0 !important;
  border: 0 !important;
  overflow: hidden;
  visibility: hidden;
  pointer-events: none;
}

[id^='ch-'] {
  scroll-margin-top: clamp(120px, 18vh, 160px);
  scroll-margin-left: 16px;
  scroll-margin-right: 8px;
}

.tl-cap {
  font-family: var(--font-mono);
  font-size: var(--tl-cap);
  color: var(--muted);
  text-transform: lowercase;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  line-height: 1.55;
  letter-spacing: 0.04em;
}

/* ── 01 rail-spine ── */
.tl-rail-spine {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--white) 94%, transparent);
  backdrop-filter: blur(8px);
  border: 2px solid var(--dark);
  border-radius: var(--radius-card-lg);
  padding: 16px 14px 18px;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.06);
}

.tl-rail-spine-track {
  display: flex;
  align-items: flex-start;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.tl-rail-spine-seg {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  max-width: 120px;
  min-height: 72px;
  text-decoration: none;
  color: var(--dark);
  text-transform: lowercase;
  padding: 6px 8px;
  font-family: var(--font-primary);
}

.tl-rail-spine-seg:hover .tl-rail-spine-dot,
.tl-rail-spine-seg:focus-visible .tl-rail-spine-dot {
  background: var(--yel);
  transform: scale(1.08);
}

.tl-rail-spine-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 3px solid var(--dark);
  background: var(--white);
  flex-shrink: 0;
  transition: background 0.15s, transform 0.12s;
}

.tl-rail-spine-range {
  font-family: var(--font-primary);
  font-size: var(--tl-range);
  font-weight: 600;
  line-height: 1.3;
  text-align: center;
  letter-spacing: -0.02em;
  hyphens: auto;
}

.tl-rail-spine-seg--split {
  border-left: 2px solid var(--dark);
  padding-left: 16px;
  margin-left: 8px;
}

/* ── 02 magazine-rail ── */
.tl-magazine-rail {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--white);
  border-bottom: 4px solid var(--dark);
  padding-bottom: 16px;
  margin-bottom: 6px;
}

.tl-magazine-rail-row {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 6px 2px 10px;
  -webkit-overflow-scrolling: touch;
}

.tl-magazine-pill {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 156px;
  max-width: 240px;
  min-height: 76px;
  padding: 12px 14px;
  border: 2px solid var(--dark);
  border-radius: var(--radius-card);
  background: #fafaf8;
  text-decoration: none;
  color: var(--dark);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.08);
  transition: background 0.15s;
}

.tl-magazine-pill:hover,
.tl-magazine-pill:focus-visible {
  background: var(--yel);
  outline: none;
}

.tl-magazine-pill-range {
  font-family: var(--font-mono);
  font-size: var(--tl-mono);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  color: var(--muted);
}

.tl-magazine-pill:hover .tl-magazine-pill-range {
  color: var(--dark);
}

.tl-magazine-pill-title {
  font-family: var(--font-primary);
  font-size: var(--tl-title);
  font-weight: 600;
  line-height: 1.35;
  text-transform: lowercase;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  letter-spacing: -0.02em;
}

/* ── 03 card-calendar ── */
.tl-card-calendar {
  padding: 14px 0;
}

.tl-card-cal-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 8px;
}

.tl-card-cal-chip {
  font-family: var(--font-primary);
  font-size: var(--tl-range);
  font-weight: 600;
  padding: 10px 16px;
  border: 2px dashed var(--dark);
  border-radius: 999px;
  background: var(--white);
  text-decoration: none;
  color: var(--dark);
  text-transform: lowercase;
  max-width: 280px;
  letter-spacing: -0.02em;
}

.tl-card-cal-chip:hover,
.tl-card-cal-chip:focus-visible {
  border-style: solid;
  background: var(--yel);
  outline: none;
}

.tl-card-cal-arr {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--tl-mono);
  user-select: none;
}

/* ── 04 newspaper-rule ── */
.tl-newspaper-rule {
  text-align: center;
  padding: 12px 0 18px;
  border-top: 4px double var(--dark);
  border-bottom: 4px double var(--dark);
  margin-bottom: 10px;
}

.tl-np-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: 8px 6px;
  font-family: var(--font-primary);
  font-size: var(--tl-range);
  font-weight: 500;
  line-height: 1.55;
}

.tl-np-sep {
  color: var(--yel);
  font-size: 12px;
  margin: 0 4px;
  text-shadow: 0 0 0 var(--dark);
}

.tl-np-link {
  color: var(--dark);
  text-transform: lowercase;
  text-decoration: underline;
  text-underline-offset: 4px;
  max-width: 28ch;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.tl-np-link:hover,
.tl-np-link:focus-visible {
  background: var(--yel);
  outline: none;
}

/* ── 05 terminal-trace ── */
.tl-terminal-trace {
  border: 1px solid #444;
  border-radius: var(--radius-card);
  background: #0f0f0f;
  padding: 16px 18px;
  font-family: var(--font-mono);
}

.tl-term-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tl-term-line {
  display: flex;
  align-items: center;
  color: #b0b0ad;
  text-decoration: none;
  font-size: var(--tl-mono);
  line-height: 1.55;
  text-transform: lowercase;
  padding: 4px 0;
  min-height: 44px;
  box-sizing: border-box;
}

.tl-term-line:hover .tl-term-range,
.tl-term-line:focus-visible .tl-term-range {
  color: var(--yel);
  outline: none;
}

.tl-term-brkt {
  color: #555;
}

.tl-term-range {
  color: #e8e8e6;
  font-weight: 500;
}

.tl-term-arrow {
  color: #4ade80;
  margin: 0 8px;
}

/* ── 06 filmstrip ── */
.tl-filmstrip {
  position: sticky;
  top: 0;
  z-index: 50;
  background: linear-gradient(180deg, var(--white) 90%, transparent);
  padding: 12px 0 16px;
}

.tl-film-row {
  display: flex;
  width: 100%;
  border: 2px solid var(--dark);
  border-radius: 8px;
  overflow: hidden;
}

.tl-film-cell {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  text-decoration: none;
  color: var(--dark);
  border-right: 2px solid var(--dark);
  background: #fafaf8;
  transition: background 0.12s;
  min-height: 56px;
}

.tl-film-cell:last-child {
  border-right: none;
}

.tl-film-cell:hover,
.tl-film-cell:focus-visible {
  background: var(--yel);
  outline: none;
}

.tl-film-range {
  font-family: var(--font-primary);
  font-size: clamp(13px, 1vw, 16px);
  font-weight: 600;
  line-height: 1.3;
  text-transform: lowercase;
  padding: 10px 8px 8px;
  text-align: center;
  hyphens: auto;
  overflow-wrap: anywhere;
  letter-spacing: -0.02em;
}

.tl-film-perf {
  height: 6px;
  margin: 0 10px 8px;
  background: repeating-linear-gradient(
    90deg,
    var(--dark) 0 3px,
    transparent 3px 8px
  );
  opacity: 0.35;
  border-radius: 2px;
}

/* ── 07 zigzag-spine ── */
.tl-zigzag {
  padding: 10px 0 22px;
}

.tl-zz-axis {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
  padding: 10px 0;
}

.tl-zz-axis::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 14px;
  bottom: 14px;
  width: 3px;
  background: var(--dark);
  transform: translateX(-50%);
  border-radius: 2px;
}

.tl-zz-row {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  margin: 6px 0;
}

.tl-zz-row--up .tl-zz-hit {
  margin-right: auto;
  margin-left: 0;
  width: calc(50% - 24px);
  text-align: right;
  flex-direction: row-reverse;
}

.tl-zz-row--dn .tl-zz-hit {
  margin-left: auto;
  margin-right: 0;
  width: calc(50% - 24px);
  text-align: left;
  flex-direction: row;
}

.tl-zz-hit {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--dark);
  text-transform: lowercase;
  z-index: 1;
  font-family: var(--font-primary);
}

.tl-zz-range {
  font-size: var(--tl-range);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.tl-zz-dot {
  width: 14px;
  height: 14px;
  background: var(--yel);
  border: 2px solid var(--dark);
  border-radius: 50%;
  flex-shrink: 0;
}

.tl-zz-hit:hover .tl-zz-dot,
.tl-zz-hit:focus-visible .tl-zz-dot {
  transform: scale(1.15);
}

/* ── 08 toc-spine (dates via JS) ── */
.tl-toc-spine-date {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--tl-mono);
  font-weight: 600;
  color: var(--yel);
  background: var(--dark);
  padding: 5px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
  width: fit-content;
  text-transform: lowercase;
  line-height: 1.35;
  letter-spacing: 0.04em;
}

.tl-toc-window-cap {
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px solid var(--dark);
  opacity: 0.85;
  font-size: var(--tl-cap);
  line-height: 1.55;
}

/* ── 09 ledger-marks ── */
.tl-ledger {
  padding: 10px 0 20px;
}

.tl-ledger-ticks {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 6px;
  border-top: 3px solid var(--dark);
  padding-top: 16px;
  position: relative;
}

.tl-ledger-tick {
  flex: 1 1 0;
  min-width: 0;
  text-align: center;
}

.tl-ledger-a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--dark);
}

.tl-ledger-mark {
  width: 3px;
  height: 16px;
  background: var(--dark);
  margin-top: -28px;
}

.tl-ledger-range {
  font-family: var(--font-primary);
  font-size: clamp(12px, 0.95vw, 15px);
  font-weight: 600;
  line-height: 1.3;
  text-transform: lowercase;
  hyphens: auto;
  letter-spacing: -0.02em;
}

.tl-ledger-a:hover .tl-ledger-mark,
.tl-ledger-a:focus-visible .tl-ledger-mark {
  background: var(--yel);
  width: 5px;
}

/* ── 10 bento-meter ── */
.tl-meter {
  padding: 8px 0 18px;
}

.tl-meter-strip {
  display: flex;
  border: 2px solid var(--dark);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.1);
}

.tl-meter-seg {
  flex: 1 1 0;
  min-width: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  text-decoration: none;
  border-right: 2px solid var(--dark);
  padding: 10px 8px;
  box-sizing: border-box;
}

.tl-meter-seg:last-child {
  border-right: none;
}

.tl-meter-seg:nth-child(4n + 1) .tl-meter-fill {
  background: rgba(255, 229, 0, 0.45);
}
.tl-meter-seg:nth-child(4n + 2) .tl-meter-fill {
  background: rgba(0, 0, 0, 0.06);
}
.tl-meter-seg:nth-child(4n + 3) .tl-meter-fill {
  background: rgba(255, 229, 0, 0.25);
}
.tl-meter-seg:nth-child(4n) .tl-meter-fill {
  background: rgba(0, 0, 0, 0.04);
}

.tl-meter-fill {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.tl-meter-seg:hover .tl-meter-fill,
.tl-meter-seg:focus-visible .tl-meter-fill {
  background: var(--yel) !important;
  opacity: 1;
}

.tl-meter-lbl {
  position: relative;
  z-index: 1;
  font-family: var(--font-primary);
  font-size: clamp(12px, 0.9vw, 15px);
  font-weight: 600;
  line-height: 1.25;
  text-transform: lowercase;
  text-align: center;
  color: var(--dark);
  hyphens: auto;
  letter-spacing: -0.02em;
}

/* Dark page (05) */
body.demo-timeline--dark .tl-cap {
  color: #9a9a98;
  border-top-color: #333;
}

body.demo-timeline--dark .demo-timeline-mount .tl-cap {
  color: #888;
  border-top-color: #333;
}

@media (prefers-reduced-motion: reduce) {
  .tl-rail-spine-dot,
  .tl-zz-dot {
    transition: none;
  }
}