/* --- Variables --- */
:root {
  --bg: #0a0e12;
  --text: #e8eaed;
  --text-muted: rgba(232, 234, 237, 0.75);
  --link: #7dd3fc;
  --link-hover: #bae6fd;
  --link-underline: rgba(125, 211, 252, 0.4);
  --line-123: #e53935;
  --line-456: #43a047;
  --line-nqr: #f9a825;
  --overlay-bg: rgba(10, 14, 18, 0.85);
  --min-tap: 44px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
}

/* --- Vertical split: left = canvas + text, right = map panel --- */
.page-wrap {
  display: flex;
  flex-direction: row;
  height: 100vh;
  min-height: 100vh;
  overflow: hidden;
}

.main-column {
  flex: 1;
  min-width: 0;
  position: relative;
  min-height: 100vh;
}

/* --- Canvas (p5) --- */
#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

#canvas-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  object-fit: cover;
}

/* --- Overlays --- */
.overlay {
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.overlay * {
  pointer-events: auto;
}

/* --- Header --- */
header.overlay {
  padding: clamp(0.5rem, 2vw, 1rem) clamp(1rem, 5vw, 3rem);
  max-width: 38rem;
}

header.overlay h1 {
  margin: 0;
  font-size: clamp(0.95rem, 2.2vw, 1.2rem);
  font-weight: 600;
  letter-spacing: 0.02em;
}

header.overlay .subtitle {
  margin: 0.15em 0 0;
  font-size: clamp(0.75rem, 1.6vw, 0.9rem);
  color: var(--text-muted);
}

header.overlay .dates {
  margin: 0.25em 0 0;
  font-size: clamp(0.7rem, 1.4vw, 0.8rem);
  color: var(--text-muted);
}

/* --- Intro blurb --- */
.intro.overlay {
  padding: 0 clamp(1rem, 5vw, 3rem);
  max-width: 34rem;
  margin-top: 0.35rem;
}

.intro.overlay p {
  margin: 0;
  font-size: clamp(0.7rem, 1.4vw, 0.8rem);
  line-height: 1.45;
  color: var(--text-muted);
}

/* --- Links --- */
a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid var(--link-underline);
  transition: color 0.2s, border-color 0.2s;
}

a:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

a:focus-visible {
  color: var(--link-hover);
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

/* Map/catalog links keep their own styles */
.map-station,
a.art-item {
  border-bottom: none;
}

/* --- Map panel (right column) --- */
.map-panel.overlay {
  width: 360px;
  min-width: 320px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: clamp(0.75rem, 3vw, 1.25rem) clamp(1rem, 2vw, 1.5rem);
  background: #0a0a0a;
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
  align-self: stretch;
}

.map-panel .map-label,
.map-panel .minimal-map,
.map-panel .catalog-label,
.map-panel .catalog-tabs {
  flex-shrink: 0;
}

.map-label {
  margin: 0 0 0.4rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.minimal-map {
  width: 100%;
  max-width: 220px;
  height: auto;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

/* Bold subway lines (schematic style) */
.map-line {
  stroke-width: 4;
}
.map-line-123 { color: var(--line-123); }
.map-line-456 { color: var(--line-456); }
.map-line-nqr { color: var(--line-nqr); }

/* Line ID circles (e.g. 1, 4, N) */
.map-line-id { color: inherit; }
.map-line-id-123 { color: var(--line-123); }
.map-line-id-456 { color: var(--line-456); }
.map-line-id-nqr { color: var(--line-nqr); }
.map-line-text {
  font-size: 11px;
  font-weight: 700;
  fill: #fff;
  font-family: inherit;
}

/* Station dots along lines */
.map-dot {
  fill: #fff;
}

/* Region label */
.map-region-label {
  font-size: 9px;
  fill: var(--text-muted);
  font-family: inherit;
  letter-spacing: 0.06em;
}

.map-station {
  cursor: pointer;
  color: var(--text);
  text-decoration: none;
  transition: opacity 0.2s;
}

@media (hover: hover) {
  .map-station:hover {
    opacity: 0.9;
  }
  .map-station:hover .map-station-circle {
    transform: scale(1);
  }
}
.map-station:focus-visible {
  opacity: 0.9;
}
.map-station:focus-visible .map-station-circle {
  transform: scale(1);
}

.map-station-circle {
  transition: transform 0.2s;
  transform-origin: center;
}

.station-label {
  font-size: 8px;
  fill: #fff;
  font-family: inherit;
}

/* Reference stations (Sol LeWitt, Dan Flavin) — highlighted on map */
.map-station-reference .map-station-circle {
  stroke-width: 2;
  filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.5));
}
.map-station-reference .station-label {
  font-weight: 700;
  font-size: 9px;
}

/* --- MTA Art catalog --- */
.catalog-label {
  margin: 0.75rem 0 0.35rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.catalog-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.catalog-tab {
  padding: 0.35rem 0.6rem;
  font-size: 0.75rem;
  font-family: inherit;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.catalog-tab:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.4);
}

.catalog-tab.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.35);
}

.catalog-list {
  flex: 1 1 0;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  font-size: 0.75rem;
  line-height: 1.45;
  -webkit-overflow-scrolling: touch;
}

.art-item {
  display: block;
  padding: 0.3rem 0;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: color 0.2s, background 0.2s;
}

a.art-item:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.art-station {
  color: var(--text);
  font-weight: 500;
}

.art-item-reference {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  padding-left: 0.5rem;
  border-left: 3px solid rgba(255, 255, 255, 0.5);
}

.art-item-reference .art-station {
  font-weight: 700;
}

.reference-badge {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.1rem 0.35rem;
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--bg);
  background: var(--text-muted);
  border-radius: 2px;
}

.catalog-error {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Mobile: stacked layout --- */
@media (max-width: 768px) {
  .page-wrap {
    flex-direction: column;
    height: auto;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .main-column {
    flex: none;
    height: 32vh;
    height: 32dvh;
    min-height: 160px;
    max-height: 38vh;
    max-height: 38dvh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .map-panel.overlay {
    width: 100%;
    min-width: 0;
    flex: 1 1 auto;
    min-height: 50vh;
    min-height: 50dvh;
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
    padding-bottom: max(clamp(0.75rem, 3vw, 1.25rem), env(safe-area-inset-bottom));
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }

  .minimal-map {
    max-width: 200px;
    min-height: 64px;
    flex-shrink: 0;
  }

  .map-panel .map-label,
  .map-panel .catalog-label,
  .map-panel .catalog-tabs {
    flex-shrink: 0;
  }

  .catalog-list {
    flex: 1 1 0;
    min-height: 120px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  header.overlay {
    padding: 0.35rem max(clamp(0.75rem, 3vw, 1.25rem), env(safe-area-inset-left)) 0.25rem max(clamp(0.75rem, 3vw, 1.25rem), env(safe-area-inset-right));
  }

  header.overlay h1 {
    font-size: 0.85rem;
  }

  header.overlay .subtitle {
    font-size: 0.68rem;
    margin-top: 0.1em;
  }

  header.overlay .dates {
    font-size: 0.62rem;
    margin-top: 0.15em;
  }

  .intro.overlay {
    padding: 0 max(clamp(0.75rem, 3vw, 1.25rem), env(safe-area-inset-left)) 0 max(clamp(0.75rem, 3vw, 1.25rem), env(safe-area-inset-right));
    margin-top: 0.2rem;
  }

  .intro.overlay p {
    font-size: 0.65rem;
    line-height: 1.4;
  }

  .map-label {
    font-size: 0.6rem;
    margin-bottom: 0.25rem;
  }

  .catalog-label {
    font-size: 0.6rem;
    margin-top: 0.5rem;
    margin-bottom: 0.25rem;
  }

  .catalog-tabs {
    margin-bottom: 0.35rem;
    gap: 0.35rem;
  }

  .catalog-tab {
    padding: 0.28rem 0.5rem;
    font-size: 0.65rem;
  }

  .catalog-list {
    font-size: 0.68rem;
    line-height: 1.35;
  }

  .map-panel.overlay {
    padding-top: 0.5rem;
    padding-bottom: max(clamp(0.5rem, 2vw, 1rem), env(safe-area-inset-bottom));
  }
}

/* Touch targets and small-screen tweaks */
@media (max-width: 600px) {
  .map-station {
    min-height: var(--min-tap);
    min-width: var(--min-tap);
  }

  .catalog-tab {
    min-height: 36px;
    padding: 0.35rem 0.5rem;
    font-size: 0.62rem;
  }

  .art-item {
    padding: 0.35rem 0;
    min-height: 32px;
    display: flex;
    align-items: center;
  }

  header.overlay h1 {
    font-size: 0.78rem;
  }

  header.overlay .subtitle {
    font-size: 0.62rem;
  }

  header.overlay .dates {
    font-size: 0.58rem;
  }

  .intro.overlay p {
    font-size: 0.6rem;
  }

  .catalog-list {
    font-size: 0.62rem;
  }

  .map-label,
  .catalog-label {
    font-size: 0.55rem;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .map-station circle,
  .map-station:hover circle { transition: none; }
  .catalog-tab,
  .art-item { transition: none; }
}