:root {
  --ink: #141414;
  --paper: #FBFBF9;
  --cobalt: #1E4FD9;
  --free: #2E7D32;
  --taken: #C62828;
  --jump: #E08A1E;
  --muted: #8A8A85;

  --font-display: 'Fraunces', Georgia, serif;
  --font-mono: 'Geist Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --card-shadow: 0 1px 2px rgba(20, 20, 20, 0.04), 0 4px 16px rgba(20, 20, 20, 0.06);
  --card-radius: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: #F3F2ED;
  color: var(--ink);
  font-family: var(--font-body);
  min-width: 320px;
}

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

.app-header {
  background: var(--cobalt);
  color: #fff;
  padding: 14px 20px;
  position: sticky;
  top: 0;
  z-index: 5;
  box-shadow: 0 2px 8px rgba(30, 79, 217, 0.25);
}

.app-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.01em;
}

main {
  padding: 20px 16px 100px;
  max-width: 760px;
  margin: 0 auto;
}

a { color: var(--cobalt); }

:focus-visible {
  outline: 2px solid var(--cobalt);
  outline-offset: 2px;
}

/* ---------- Landing ---------- */

.status-line {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1.35;
  margin: 4px 0 20px;
  color: var(--ink);
}

/* ---------- Booking form ---------- */

.book-panel {
  background: #fff;
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  padding: 22px 20px;
  margin-bottom: 20px;
}

.book-panel label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.sap-input {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid #e2e0d8;
  border-radius: 10px;
  background: var(--paper);
  color: var(--ink);
}

.sap-input:focus { border-color: var(--cobalt); }

.digit-preview {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  letter-spacing: 0.35em;
  color: var(--muted);
  min-height: 1.6em;
  margin: 10px 2px 4px;
}

.btn {
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  border-radius: 10px;
  padding: 14px 22px;
  background: var(--cobalt);
  color: #fff;
  cursor: pointer;
  width: 100%;
  margin-top: 8px;
  box-shadow: 0 2px 6px rgba(30, 79, 217, 0.28);
  transition: transform 0.06s ease, box-shadow 0.06s ease;
}

.btn:active { transform: translateY(1px); box-shadow: 0 1px 3px rgba(30, 79, 217, 0.28); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; }

.btn.secondary {
  background: transparent;
  color: var(--muted);
  box-shadow: none;
  font-weight: 500;
  font-size: 0.9rem;
  padding: 8px;
  margin-top: 4px;
}

/* ---------- Result cards ---------- */

.card {
  background: #fff;
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  padding: 22px 20px;
  margin-bottom: 20px;
  border-left: 4px solid var(--free);
}

.card .seat-code {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
}

.card .descriptor {
  margin-top: 6px;
  font-size: 1rem;
  color: #3a3a38;
}

.card.pair-card,
.card:has(.headline) {
  border-left-color: var(--muted);
}

.headline {
  font-size: 1.1rem;
  font-weight: 600;
}

.subnote {
  color: var(--muted);
  margin-top: 8px;
  font-size: 0.9rem;
}

.forfeit-link {
  display: inline-block;
  margin-top: 14px;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  color: var(--cobalt);
  text-decoration: underline;
}

/* ---------- Bus diagrams ---------- */

.buses {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

@media (max-width: 640px) {
  .buses { grid-template-columns: 1fr; }
}

.bus-panel {
  background: #fff;
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  padding: 16px 16px 10px;
}

.bus-panel h3 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0 0 2px;
  text-align: center;
  font-size: 1.05rem;
}

.seat-count {
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 10px;
}

.bus-diagram {
  width: 100%;
  height: auto;
  display: block;
}

.bus-outline {
  fill: var(--paper);
  stroke: #ddd9cd;
  stroke-width: 2;
}

.windscreen {
  fill: none;
  stroke: var(--muted);
  stroke-width: 2;
}

.driver {
  fill: #e2e0d8;
  stroke: #c9c6bb;
  stroke-width: 1.5;
}

.row-pod {
  fill: #00000006;
  stroke: #00000010;
  stroke-width: 1;
}

.door-marker rect {
  fill: none;
  stroke: var(--muted);
  stroke-dasharray: 3 3;
}

.door-label {
  font-size: 7px;
  fill: var(--muted);
  letter-spacing: 0.1em;
}

.seat use {
  fill: var(--free);
  stroke: rgba(20, 20, 20, 0.08);
  stroke-width: 1;
  transition: fill 0.15s ease, filter 0.15s ease, transform 0.1s ease;
  transform-box: fill-box;
  transform-origin: center;
  filter: drop-shadow(0 0 4px rgba(46, 125, 50, 0.55));
}

.seat.taken use { fill: var(--taken); filter: drop-shadow(0 0 5px rgba(198, 40, 40, 0.6)); }
.seat.jump-deployed use { fill: var(--jump); filter: drop-shadow(0 0 5px rgba(224, 138, 30, 0.6)); }
.seat.jump-empty use {
  fill: none;
  stroke: var(--muted);
  stroke-width: 2;
  filter: none;
}

.seat { cursor: pointer; }

.seat:hover use { transform: scale(1.1); }
.seat:not(.taken):not(.jump-deployed):hover use { filter: drop-shadow(0 0 9px rgba(46, 125, 50, 0.85)); }
.seat.taken:hover use { filter: drop-shadow(0 0 9px rgba(198, 40, 40, 0.9)); }
.seat.jump-deployed:hover use { filter: drop-shadow(0 0 9px rgba(224, 138, 30, 0.9)); }
.seat.jump-empty:hover use { filter: drop-shadow(0 0 6px rgba(138, 138, 133, 0.7)); transform: scale(1.06); }

.seat-sap {
  font-family: var(--font-mono);
  font-size: 9px;
  fill: #fff;
  text-anchor: middle;
  dominant-baseline: middle;
  pointer-events: none;
  x: 22;
  y: 26;
}

.jump-empty .seat-sap { fill: var(--muted); }

.seat.mine use { animation: seat-pulse 1.2s ease-out 1; }

@keyframes seat-pulse {
  0% { transform: scale(1); }
  30% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .seat.mine use { animation: none; }
}

/* ---------- Tooltip ---------- */

#tooltip {
  position: fixed;
  z-index: 10;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  max-width: 260px;
  pointer-events: none;
  display: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

#tooltip.visible { display: block; }

/* ---------- Empty / error states ---------- */

.notice {
  background: #fff;
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  padding: 14px 18px;
  margin-bottom: 16px;
  border-left: 4px solid var(--muted);
  font-size: 0.92rem;
}

.notice.error { border-left-color: var(--taken); color: var(--taken); }

/* ---------- Footer ---------- */

footer.privacy {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(251, 251, 249, 0.95);
  backdrop-filter: blur(4px);
  border-top: 1px solid #e5e3dc;
  padding: 8px 16px;
  font-size: 0.7rem;
  color: var(--muted);
  text-align: center;
}

.hidden { display: none !important; }