/* ═══════════════════════════════════════════════════════════════
   CONCOURSE — morning departures
   A bright terminal hall: white concourse, charcoal flap board,
   signal yellow, wayfinding blue. Barlow superfamily throughout.
   ═══════════════════════════════════════════════════════════════ */

:root {
  --hall: oklch(98.6% 0.002 250);
  --ink: oklch(21% 0.015 260);
  --ink-70: oklch(36% 0.012 260);
  --ink-50: oklch(50% 0.01 260);
  --line: oklch(89% 0.005 250);

  --board: oklch(24% 0.015 265);
  --board-edge: oklch(31% 0.015 265);
  --flap: oklch(19% 0.015 265);
  --signal: oklch(85% 0.15 92);          /* board lettering yellow */
  --signal-deep: oklch(56% 0.12 85);     /* yellow usable on white */
  --way: oklch(43% 0.13 255);            /* wayfinding blue */
  --go: oklch(52% 0.13 155);             /* on-time green */

  --sans: "Barlow", "Segoe UI", Arial, sans-serif;
  --cond: "Barlow Semi Condensed", "Arial Narrow", sans-serif;

  --measure: 68ch;
  --gutter: clamp(1rem, 4vw, 3rem);
  --z-skip: 100;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--hall);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { text-wrap: balance; }
p { text-wrap: pretty; }
a { color: var(--way); text-underline-offset: 2px; }
::selection { background: oklch(90% 0.09 92); }

.skip-link {
  position: absolute; left: 1rem; top: -4rem;
  background: var(--board); color: var(--signal);
  padding: 0.6rem 1.1rem; font-weight: 700;
  z-index: var(--z-skip); text-decoration: none; transition: top 0.2s ease-out;
}
.skip-link:focus { top: 1rem; }

/* ═══ Hall header ═══ */
.hall {
  max-width: 82rem; margin-inline: auto;
  padding: clamp(1.2rem, 3vw, 2.2rem) var(--gutter) clamp(0.9rem, 2vw, 1.4rem);
  display: flex; align-items: end; justify-content: space-between; gap: 1.5rem;
}
.hall-name {
  margin: 0 0 0.2rem;
  font-weight: 800;
  font-size: clamp(2rem, 4.6vw, 2.9rem);
  letter-spacing: -0.02em;
  line-height: 1;
  display: flex; align-items: center; gap: 0.5rem;
}
.hall-tick {
  width: 0.55em; height: 0.55em; border-radius: 50%;
  background: var(--signal);
  box-shadow: inset 0 0 0 2px oklch(70% 0.13 88);
}
.hall-line { margin: 0; font-size: 1.02rem; color: var(--ink-70); font-weight: 500; }
.hall-dim { margin: 0.15rem 0 0; font-size: 0.88rem; color: var(--ink-50); }
.hall-clock {
  display: flex; flex-direction: column; align-items: end; gap: 0.1rem;
  font-family: var(--cond); font-weight: 600;
  color: var(--ink);
}
#clockTime { font-size: clamp(1.6rem, 3vw, 2.2rem); font-variant-numeric: tabular-nums; letter-spacing: 0.04em; }
.clock-tz { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-50); }

/* ═══ Departure board ═══ */
.board-wrap { max-width: 82rem; margin-inline: auto; padding: 0 var(--gutter); }
.board {
  background: var(--board);
  border-radius: 0.9rem;
  padding: clamp(0.7rem, 1.6vw, 1.2rem) clamp(0.8rem, 2vw, 1.6rem);
  box-shadow: 0 24px 60px -24px oklch(20% 0.02 265 / 0.55), inset 0 1px 0 var(--board-edge);
  overflow-x: auto;
  overscroll-behavior-x: contain;
}
.note-swipe { display: none; }
@media (max-width: 880px) {
  .board {
    -webkit-mask-image: linear-gradient(90deg, #000 0 88%, transparent 99%);
    mask-image: linear-gradient(90deg, #000 0 88%, transparent 99%);
  }
  .note-swipe { display: inline; }
}
.board-head, .board-row {
  display: grid;
  grid-template-columns: 4.2rem 11rem minmax(0, 1fr) 8.6rem;
  gap: clamp(0.6rem, 1.6vw, 1.4rem);
  align-items: center;
  min-width: 40rem;
}
.board-head {
  font-family: var(--cond); font-weight: 600; font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.16em;
  color: oklch(66% 0.02 265);
  padding: 0.3rem 0.4rem 0.55rem;
  border-bottom: 1px solid var(--board-edge);
}
.board-row {
  width: 100%; text-align: left;
  background: none; border: none; cursor: pointer;
  padding: clamp(0.5rem, 1.2vw, 0.75rem) 0.4rem;
  border-bottom: 1px solid var(--board-edge);
  font: inherit; color: inherit;
  transition: background 0.2s ease-out;
}
.board-row:last-child { border-bottom: none; }
.board-row:hover, .board-row:focus-visible { background: oklch(28% 0.02 265); outline: none; }
.board-row:focus-visible { box-shadow: inset 0 0 0 2px var(--signal); }

.brd-gate {
  font-family: var(--cond); font-weight: 700; font-size: 1.05rem;
  color: var(--hall);
  background: oklch(33% 0.02 265);
  border-radius: 0.35rem;
  padding: 0.18rem 0; text-align: center;
}
.brd-dest { display: flex; flex-direction: column; gap: 0.1rem; min-width: 0; }
.brd-dest .d1 {
  font-family: var(--cond); font-weight: 700; font-size: 1rem;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--hall); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.brd-dest .d2 { font-size: 0.76rem; color: oklch(63% 0.02 265); }

/* split-flap lead line */
.flapline { display: flex; flex-wrap: nowrap; gap: 2px; overflow: hidden; }
.flap {
  position: relative;
  width: 1.05ch; height: 1.5em;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--cond); font-weight: 600; font-size: 0.98rem;
  text-transform: uppercase;
  color: var(--signal);
  background: linear-gradient(180deg, var(--flap) 0 48%, oklch(16% 0.015 265) 48% 52%, var(--flap) 52% 100%);
  border-radius: 2px;
  perspective: 120px;
}
.flap.space { background: none; }
.brd-status {
  font-family: var(--cond); font-weight: 700; font-size: 0.86rem;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: oklch(80% 0.13 155);
  white-space: nowrap;
}
.brd-status.busy { color: var(--signal); }
.board-note {
  margin: 0.7rem 0 0;
  font-size: 0.86rem; color: var(--ink-50);
  padding-left: 0.2rem;
}

/* ═══ Atrium ═══ */
.atrium {
  max-width: 82rem; margin-inline: auto;
  padding: clamp(1.6rem, 4vw, 3rem) var(--gutter) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  gap: clamp(1.4rem, 4vw, 3.4rem);
  align-items: center;
}
.atrium-head {
  margin: 0 0 0.7rem;
  font-size: clamp(2.3rem, 5.2vw, 3.9rem);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.025em;
}
.atrium-sub { margin: 0 0 0.7rem; max-width: 50ch; font-size: 1.1rem; color: var(--ink-70); }
.atrium-note { margin: 0; font-family: var(--cond); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-50); }
#pylon { width: 100%; height: clamp(300px, 40vw, 430px); display: block; }

/* ═══ Gates ═══ */
#gates { max-width: 82rem; margin-inline: auto; padding: clamp(1.5rem, 4vw, 2.6rem) var(--gutter) 0; }
.gate { padding: clamp(1.8rem, 4vw, 3rem) 0; border-top: 1px solid var(--line); scroll-margin-top: 1.2rem; }
.gate:first-child { border-top: none; }
.gate-head {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.8rem 1.1rem;
  margin-bottom: 0.5rem;
}
.gate-chip {
  font-family: var(--cond); font-weight: 700; font-size: 1.02rem;
  background: var(--board); color: var(--hall);
  border-radius: 0.45rem;
  padding: 0.32rem 0.7rem;
  letter-spacing: 0.05em;
}
.gate-title {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.15rem);
  font-weight: 800; letter-spacing: -0.02em; line-height: 1.05;
}
.gate-status {
  font-family: var(--cond); font-weight: 700; font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--go);
}
.gate-deck { margin: 0 0 1.4rem; max-width: 72ch; color: var(--ink-70); font-size: 0.98rem; }

.gate-flow { display: flex; flex-direction: column; gap: clamp(1.5rem, 3vw, 2.2rem); max-width: var(--measure); }

/* Departure (story) */
.dep { display: grid; grid-template-columns: 5.2rem minmax(0, 1fr); gap: clamp(0.8rem, 2vw, 1.6rem); }
.dep-time {
  font-family: var(--cond); font-weight: 700; font-size: 1.06rem;
  color: var(--ink); font-variant-numeric: tabular-nums;
  display: flex; flex-direction: column; gap: 0.15rem; align-items: start;
}
.dep-time .dt-src {
  font-size: 0.68rem; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-50);
  max-width: 5.2rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.dep-head {
  margin: 0 0 0.45rem;
  font-size: clamp(1.24rem, 2.3vw, 1.54rem);
  font-weight: 800; line-height: 1.14; letter-spacing: -0.012em;
}
.dep-head a { color: inherit; text-decoration: none; }
.dep-head a:hover { color: var(--way); text-decoration: underline; text-decoration-thickness: 2px; }
.dep-sum { margin: 0 0 0.7rem; }
.dep-why {
  margin: 0 0 0.75rem;
  padding: 0.55rem 0.85rem;
  border-radius: 0.55rem;
  background: oklch(95.5% 0.025 92);
  font-size: 0.97rem; line-height: 1.55; color: var(--ink-70);
}
.dep-why strong {
  font-family: var(--cond); font-weight: 700; font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--signal-deep);
}
.dep-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 0.7rem; }
.dep-tag {
  font-family: var(--cond); font-weight: 600; font-size: 0.76rem;
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--ink-70);
  border: 1px solid var(--line); border-radius: 0.35rem;
  padding: 0.16rem 0.5rem;
}

/* Traveler information (glossary) */
.tinfo {
  margin: 0 0 0.7rem;
  border: 1px solid var(--line); border-radius: 0.6rem;
  background: oklch(97% 0.008 250);
}
.tinfo summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; gap: 0.55rem;
  padding: 0.5rem 0.85rem;
  font-family: var(--cond); font-weight: 700; font-size: 0.84rem;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--ink-70);
}
.tinfo summary::-webkit-details-marker { display: none; }
.tinfo summary::before {
  content: "i";
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.15rem; height: 1.15rem; border-radius: 50%;
  background: var(--way); color: var(--hall);
  font-family: var(--sans); font-weight: 700; font-size: 0.78rem;
  font-style: italic; text-transform: none;
}
.tinfo summary:hover { color: var(--ink); }
.tinfo-body { padding: 0.15rem 0.9rem 0.75rem; display: grid; gap: 0.5rem; }
.tinfo-term { margin: 0; font-size: 0.95rem; line-height: 1.55; }
.tinfo-term strong { color: var(--ink); }
.tinfo-term .t-why { color: var(--ink-70); font-size: 0.88rem; }

.dep-meta {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.3rem 1.2rem;
  font-size: 0.85rem; color: var(--ink-50);
}
.dep-meta .learn { color: var(--way); font-weight: 600; }

.gate-empty { margin: 0; color: var(--ink-50); font-style: italic; }

/* ═══ Error + foot ═══ */
.wire-error { max-width: 82rem; margin-inline: auto; padding: 2.5rem var(--gutter); }
.foot {
  max-width: 82rem; margin-inline: auto;
  padding: clamp(2rem, 5vw, 3rem) var(--gutter) clamp(2.4rem, 5vw, 3.4rem);
  color: var(--ink-70); font-size: 0.95rem;
  border-top: 1px solid var(--line);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}
.foot p { margin: 0.25rem 0; }
.foot-name { font-weight: 800; font-size: 1.3rem; color: var(--ink); }
.foot-dim { color: var(--ink-50); }

/* ═══ Responsive ═══ */
@media (max-width: 880px) {
  .hall { flex-direction: column; align-items: start; gap: 0.6rem; }
  .hall-clock { flex-direction: row; align-items: baseline; gap: 0.6rem; }
  .atrium { grid-template-columns: 1fr; }
  .atrium-stage { order: 2; }
  #pylon { height: clamp(260px, 60vw, 340px); }
  .dep { grid-template-columns: 1fr; gap: 0.3rem; }
  .dep-time { flex-direction: row; align-items: baseline; gap: 0.6rem; }
  .dep-time .dt-src { max-width: none; }
  .board-head, .board-row { grid-template-columns: 3.4rem 8rem minmax(0, 1fr) 6.4rem; min-width: 34rem; }
}

@media (prefers-reduced-motion: reduce) {
  .board-row { transition: none; }
}