/* ==========================================================================
   FlightDrop — design tokens
   Direction: airport split-flap departures board. Prices and statuses are
   rendered like flap-board tiles; navy night sky background; amber + teal
   as the two "flap" accent colors (price drop vs. holding steady).
   ========================================================================== */

:root {
  --navy-950: #0b1220;
  --navy-900: #0e1526;
  --panel-900: #141b2c;
  --panel-800: #1b2338;
  --hairline: #2a3450;

  --amber: #f5c842;
  --amber-dim: #a98a2e;
  --teal: #2dd4bf;
  --coral: #ff6b5e;

  --ink-0: #f1f0ec;
  --ink-1: #c7cede;
  --ink-2: #7c89a6;

  --radius-sm: 6px;
  --radius-md: 10px;

  --font-display: "SFMono-Regular", ui-monospace, Menlo, Consolas, "Liberation Mono", monospace;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--navy-950);
  color: var(--ink-0);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100dvh;
  padding-bottom: 84px; /* clear the bottom nav */
  background-image:
    radial-gradient(ellipse at top, rgba(245, 200, 66, 0.06), transparent 55%),
    radial-gradient(ellipse at bottom, rgba(45, 212, 191, 0.05), transparent 50%);
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

/* ---------------------------------------------------------------------- */
/* Top bar                                                                 */
/* ---------------------------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 20px 20px 14px;
  background: linear-gradient(var(--navy-950) 70%, transparent);
}

.topbar .wordmark {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.topbar .wordmark span { color: var(--ink-2); }

.topbar .subline {
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.06em;
}

main {
  padding: 0 16px 24px;
  max-width: 560px;
  margin: 0 auto;
}

/* ---------------------------------------------------------------------- */
/* Split-flap tile primitive — the signature element                      */
/* ---------------------------------------------------------------------- */

.flap {
  display: inline-flex;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.flap .digit {
  background: var(--panel-800);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  padding: 2px 4px;
  margin-right: 2px;
  min-width: 1ch;
  text-align: center;
  box-shadow: inset 0 -6px 8px -6px rgba(0,0,0,0.5);
}

.flap.updated .digit {
  animation: flap-flip 420ms ease;
}

@keyframes flap-flip {
  0% { transform: rotateX(90deg); opacity: 0.2; }
  60% { transform: rotateX(-8deg); opacity: 1; }
  100% { transform: rotateX(0deg); }
}

@media (prefers-reduced-motion: reduce) {
  .flap.updated .digit { animation: none; }
}

/* ---------------------------------------------------------------------- */
/* Cards                                                                   */
/* ---------------------------------------------------------------------- */

.card {
  background: var(--panel-900);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 12px;
}

.watch-card {
  display: block;
  position: relative;
  padding-left: 18px;
  overflow: hidden;
}

.watch-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--ink-2);
}

.watch-card[data-status="dropped"]::before,
.watch-card[data-status="below-target"]::before { background: var(--teal); }
.watch-card[data-status="unchanged"]::before { background: var(--ink-2); }
.watch-card[data-status="above-target"]::before { background: var(--coral); }

.watch-card .row-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.watch-card .name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-0);
}

.watch-card .route {
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 2px;
}

.watch-card .price-block {
  text-align: right;
}

.watch-card .price-block .flap { font-size: 20px; color: var(--amber); }
.watch-card[data-status="dropped"] .price-block .flap,
.watch-card[data-status="below-target"] .price-block .flap { color: var(--teal); }

.watch-card .target {
  font-size: 11px;
  color: var(--ink-2);
  margin-top: 4px;
}

.status-pill {
  display: inline-block;
  margin-top: 10px;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--hairline);
  color: var(--ink-1);
}

.watch-card[data-status="dropped"] .status-pill,
.watch-card[data-status="below-target"] .status-pill {
  color: var(--teal);
  border-color: rgba(45, 212, 191, 0.4);
}
.watch-card[data-status="above-target"] .status-pill {
  color: var(--coral);
  border-color: rgba(255, 107, 94, 0.4);
}

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

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--ink-2);
}

.empty-state .flap { font-size: 28px; margin-bottom: 12px; color: var(--ink-2); }
.empty-state h2 { font-family: var(--font-display); font-size: 14px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-1); margin: 0 0 6px; }
.empty-state p { font-size: 13px; margin: 0 0 18px; line-height: 1.5; }

/* ---------------------------------------------------------------------- */
/* Forms                                                                   */
/* ---------------------------------------------------------------------- */

.field { margin-bottom: 16px; }

.field label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: 6px;
}

.field input[type="text"],
.field input[type="number"],
.field input[type="date"],
.field input[type="email"],
.field select,
.field textarea {
  width: 100%;
  background: var(--panel-800);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--ink-0);
  padding: 11px 12px;
  font-size: 15px;
  font-family: var(--font-body);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--amber);
  outline-offset: 1px;
}

.field textarea { min-height: 70px; resize: vertical; }

.leg-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 8px;
  margin-bottom: 8px;
  align-items: center;
}

.leg-row input { width: 100%; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: var(--radius-sm);
  padding: 13px 18px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
}

.btn-primary { background: var(--amber); color: var(--navy-950); }
.btn-secondary { background: var(--panel-800); color: var(--ink-0); border: 1px solid var(--hairline); }
.btn-ghost { background: transparent; color: var(--ink-2); border: 1px dashed var(--hairline); }
.btn-danger { background: transparent; color: var(--coral); border: 1px solid rgba(255,107,94,0.4); }
.btn-sm { padding: 8px 12px; font-size: 12px; width: auto; }

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------------------------------------------------------------------- */
/* Section headers                                                         */
/* ---------------------------------------------------------------------- */

.section-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 20px 0 10px;
}

.section-label:first-child { margin-top: 4px; }

/* ---------------------------------------------------------------------- */
/* Bottom nav                                                              */
/* ---------------------------------------------------------------------- */

.bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  display: flex;
  background: var(--navy-900);
  border-top: 1px solid var(--hairline);
  padding: 10px 10px calc(10px + env(safe-area-inset-bottom));
  z-index: 20;
}

.bottom-nav a {
  flex: 1;
  text-align: center;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding: 6px 0;
  border-radius: var(--radius-sm);
}

.bottom-nav a.active { color: var(--amber); }
.bottom-nav a .icon { display: block; font-size: 18px; margin-bottom: 2px; }

/* ---------------------------------------------------------------------- */
/* Toast                                                                   */
/* ---------------------------------------------------------------------- */

.toast {
  position: fixed;
  bottom: 92px;
  left: 16px; right: 16px;
  background: var(--panel-800);
  border: 1px solid var(--hairline);
  color: var(--ink-0);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  z-index: 30;
  transform: translateY(12px);
  opacity: 0;
  transition: transform 200ms ease, opacity 200ms ease;
  pointer-events: none;
}

.toast.show { transform: translateY(0); opacity: 1; }
.toast.error { border-color: rgba(255,107,94,0.5); color: var(--coral); }
.toast.success { border-color: rgba(45,212,191,0.5); color: var(--teal); }

/* ---------------------------------------------------------------------- */
/* Misc                                                                    */
/* ---------------------------------------------------------------------- */

.divider { border: none; border-top: 1px solid var(--hairline); margin: 16px 0; }

.link-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.link-row a {
  font-size: 12px;
  color: var(--ink-1);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 6px 12px;
}

.event-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--hairline);
  font-size: 13px;
}

.event-row:last-child { border-bottom: none; }
.event-row .meta { color: var(--ink-2); font-size: 11px; margin-top: 2px; }

.badge {
  display: inline-block;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--panel-800);
  color: var(--ink-2);
  border: 1px solid var(--hairline);
  margin-left: 6px;
}

code {
  font-family: var(--font-display);
  background: var(--panel-800);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
  color: var(--amber);
}

ol.steps { padding-left: 20px; color: var(--ink-1); font-size: 14px; line-height: 1.7; }