/* Flight Price Tracker. BB readability contract: body 16px+ at every viewport,
   list copy 15px+, labels 12px+, 44px tap targets, single column below 560px,
   no horizontal overflow at 375px and up. */

:root {
  --bg: #07101d;
  --card: #0d1a2d;
  --card-alt: #122139;
  --ink: #eef6ff;
  --muted: #9fb1c9;
  --green: #7df0b3;
  --blue: #63d8ff;
  --orange: #ffb45b;
  --line: #263850;
  --red: #ff8a8a;
}

* , *::before, *::after {
  box-sizing: border-box;
  min-width: 0;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  overflow-wrap: anywhere;
  -webkit-text-size-adjust: 100%;
}

img, svg {
  max-width: 100%;
  height: auto;
}

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

.page {
  max-width: 1024px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

.site-header h1 {
  font-size: 1.75rem;
  line-height: 1.2;
  margin: 8px 0 4px;
}

.tagline {
  color: var(--muted);
  margin: 4px 0 12px;
}

.data-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
}

.label {
  font-size: 0.75rem; /* 12px floor */
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.value {
  font-size: 0.9375rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.chip-neutral { color: var(--muted); }
.chip-first { color: var(--blue); border-color: var(--blue); }
.chip-up { color: var(--orange); border-color: var(--orange); }
.chip-down { color: var(--green); border-color: var(--green); }
.chip-same { color: var(--muted); }
.chip-new { color: var(--blue); }
.chip-preferred { color: var(--orange); border-color: var(--orange); }

.route-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.tab {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--ink);
  font-size: 1rem;
  cursor: pointer;
}

.tab[aria-selected="true"] {
  background: var(--card-alt);
  border-color: var(--blue);
  color: var(--blue);
}

.tab:focus-visible, .price-link:focus-visible, a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.route-meta {
  color: var(--muted);
  font-size: 0.9375rem;
  margin: 0 0 16px;
}

.route-summary {
  color: var(--muted);
  margin: 0 0 12px;
  font-size: 0.9375rem;
}

.airline-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin: 0 0 12px;
}

.airline-filter label {
  font-size: 0.875rem;
  color: var(--muted);
}

.airline-filter select {
  min-height: 44px;
  max-width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--ink);
  font-size: 1rem;
}

.airline-filter-status {
  width: 100%;
  margin: 0;
  color: var(--blue);
  font-size: 0.9375rem;
  font-weight: 600;
}

.movement-summary {
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 12px 16px;
  margin: 0 0 16px;
}

.movement-title {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 700;
}

.movement-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 4px;
}

.movement-word {
  font-size: 1.125rem;
  font-weight: 700;
}

.movement-arrow {
  font-size: 1.25rem;
  line-height: 1;
}

.movement-detail {
  color: var(--muted);
  font-size: 0.9375rem;
  margin: 0 0 4px;
}

.movement-freshness {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0;
}

.movement-stale {
  font-size: 0.875rem;
  color: var(--orange);
  font-weight: 600;
  margin: 4px 0 0;
}

.movement-up { border-left-color: var(--orange); }
.movement-up .movement-word, .movement-up .movement-arrow { color: var(--orange); }
.movement-down { border-left-color: var(--green); }
.movement-down .movement-word, .movement-down .movement-arrow { color: var(--green); }
.movement-mixed { border-left-color: var(--blue); }
.movement-mixed .movement-word, .movement-mixed .movement-arrow { color: var(--blue); }
.movement-same { border-left-color: var(--muted); }
.movement-baseline, .movement-incomparable { border-left-color: var(--blue); }

.best-now {
  margin: 0 0 16px;
}

.section-head h2 {
  font-size: 1.375rem;
  margin: 0;
}

.section-head p {
  color: var(--muted);
  margin: 2px 0 10px;
}

.best-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.best-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 12px;
}

.best-date, .best-airline {
  font-weight: 700;
}

.best-airline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
}

.best-meta {
  color: var(--muted);
  font-size: 0.9375rem;
}

.best-price {
  flex: 0 0 auto;
}

.notice {
  border: 1px solid var(--line);
  border-left: 4px solid var(--blue);
  background: var(--card);
  border-radius: 10px;
  padding: 12px 16px;
  margin: 12px 0;
  font-size: 0.9375rem;
}

.notice-failed {
  border-left-color: var(--red);
  color: var(--ink);
}

.notice-empty {
  border-left-color: var(--orange);
}

.trend {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 12px 16px 16px;
  margin: 0 0 20px;
}

.trend h2 {
  font-size: 1.125rem;
  margin: 0 0 4px;
}

.trend-caption {
  color: var(--muted);
  font-size: 0.9375rem;
  margin: 0 0 8px;
}

.trend svg {
  display: block;
  width: 100%;
  max-height: 180px;
}

.weekly-cheapest {
  margin: 0 0 20px;
}

.week-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
}

.week-card {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 12px 14px 14px;
}

.week-range {
  font-size: 1.0625rem;
  margin: 0 0 8px;
}

.week-tie-note {
  color: var(--muted);
  font-size: 0.9375rem;
  margin: 0 0 8px;
}

.week-tie-more {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 6px 0 0;
}

.week-date-row {
  display: grid;
  grid-template-columns: 1fr minmax(96px, auto);
  gap: 4px 12px;
  align-items: center;
  border-top: 1px solid var(--line);
  padding: 8px 0;
}

.week-date-row:first-of-type {
  border-top: none;
  padding-top: 0;
}

.week-date-main {
  font-size: 0.9375rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.week-date {
  font-weight: 700;
}

.week-airline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
}

.week-meta {
  color: var(--muted);
}

.week-price {
  justify-self: end;
}

.data-details {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--muted);
}

.data-details summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  cursor: pointer;
  padding: 8px 14px;
  color: var(--ink);
  font-weight: 600;
}

.data-details p {
  margin: 0;
  padding: 0 14px 14px;
  font-size: 0.9375rem;
}

.date-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 12px;
}

.date-card {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 12px 14px 14px;
}

.date-card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.date-card-head h3 {
  font-size: 1.0625rem;
  margin: 0;
}

.gap-state {
  color: var(--muted);
  font-size: 0.9375rem;
  margin: 4px 0 0;
}

.option {
  display: grid;
  grid-template-columns: minmax(96px, auto) 1fr;
  gap: 4px 12px;
  align-items: center;
  border-top: 1px solid var(--line);
  padding: 10px 0;
}

.option:last-child {
  padding-bottom: 2px;
}

.price-link {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 4px 10px;
  border-radius: 10px;
  background: var(--card-alt);
  color: var(--blue);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
  border: 1px solid var(--line);
}

.price-link .native {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--muted);
}

.option-main {
  font-size: 0.9375rem; /* 15px floor for list copy */
}

.option-airline {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.option-meta, .option-baggage {
  color: var(--muted);
}

.option-engine {
  color: var(--orange);
}

.return-line {
  border-top: 1px dashed var(--line);
  margin-top: 8px;
  padding-top: 8px;
  font-size: 0.9375rem;
}

.return-note {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.875rem;
}

.site-footer {
  margin-top: 32px;
  color: var(--muted);
  font-size: 0.9375rem;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.loading-state {
  color: var(--muted);
}

@media (max-width: 560px) {
  .airline-filter select {
    width: 100%;
  }
  .best-grid {
    grid-template-columns: 1fr;
  }
  .best-card {
    flex-direction: column;
    align-items: stretch;
  }
  .best-card .best-price {
    width: 100%;
    align-items: flex-start;
  }
  .date-grid {
    grid-template-columns: 1fr;
  }
  .week-grid {
    grid-template-columns: 1fr;
  }
  .week-date-row {
    grid-template-columns: 1fr;
  }
  .week-price {
    width: 100%;
    justify-self: stretch;
    align-items: flex-start;
  }
  .option {
    grid-template-columns: 1fr;
  }
  .price-link {
    width: 100%;
    align-items: flex-start;
  }
}