:root {
  --color-ink: #10263d;
  --color-muted: #5b7087;
  --color-line: #dce8f4;
  --color-soft: #edf7ff;
  --color-accent: #0b6bcb;
  --color-accent-dark: #07549f;
  --color-error: #a82835;
  --color-error-soft: #fff1f2;
  --color-white: #ffffff;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --radius-small: 0.65rem;
  --radius-large: 1.25rem;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 20rem;
  color: var(--color-ink);
  background: linear-gradient(180deg, var(--color-soft) 0, var(--color-white) 24rem);
  font: 16px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input, select { font: inherit; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(72rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: var(--space-4) 0;
}

.brand {
  display: inline-flex;
  gap: var(--space-2);
  align-items: center;
  color: var(--color-ink);
  font-weight: 750;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border-radius: 50%;
  color: var(--color-white);
  background: var(--color-accent);
}

.sample-badge, .eyebrow {
  color: var(--color-accent-dark);
  font-size: 0.8125rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sample-badge {
  padding: 0.3rem 0.7rem;
  border: 1px solid #b9daf7;
  border-radius: 999px;
  background: var(--color-white);
}

main {
  width: min(72rem, calc(100% - 2rem));
  margin: var(--space-3) auto var(--space-6);
}

.search-panel {
  padding: clamp(1.5rem, 4vw, 3rem);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  background: color-mix(in srgb, var(--color-white) 94%, transparent);
  box-shadow: 0 1.25rem 3rem rgba(35, 91, 140, 0.09);
}

.search-panel__intro { max-width: 42rem; }
.eyebrow { margin: 0 0 var(--space-1); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: var(--space-2); font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1.05; letter-spacing: -0.04em; }
.search-panel__intro > p:last-child { color: var(--color-muted); }

.search-form {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-5);
}

label {
  display: grid;
  gap: 0.4rem;
  color: var(--color-muted);
  font-size: 0.875rem;
  font-weight: 700;
}

input, select, button {
  min-height: 3rem;
  border-radius: var(--radius-small);
}

input, select {
  width: 100%;
  border: 1px solid #bfd1e2;
  padding: 0.65rem 0.75rem;
  color: var(--color-ink);
  background: var(--color-white);
}

input:focus, select:focus, button:focus-visible, a:focus-visible {
  outline: 3px solid rgba(11, 107, 203, 0.24);
  outline-offset: 2px;
}

.test-control { grid-column: span 2; }
.date-range-note {
  grid-column: 1 / -1;
  margin: calc(var(--space-1) * -1) 0 0;
  color: var(--color-muted);
  font-size: 0.8125rem;
}

#search-button {
  align-self: end;
  grid-column: span 2;
  border: 0;
  padding: 0.7rem 1rem;
  color: var(--color-white);
  background: var(--color-accent);
  font-weight: 750;
  cursor: pointer;
}

#search-button:hover { background: var(--color-accent-dark); }
button:disabled { cursor: wait; opacity: 0.58; }

.results-section { margin-top: var(--space-5); }
.results-section__header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.results-section h2 { margin-bottom: var(--space-1); font-size: 1.35rem; }
.busy-indicator { color: var(--color-accent-dark); font-weight: 700; }

.status-line {
  min-height: 1.6rem;
  margin-bottom: var(--space-3);
  color: var(--color-muted);
}

.status-line--empty, .status-line--error {
  padding: var(--space-3);
  border-radius: var(--radius-small);
  background: var(--color-soft);
}

.status-line--error { color: var(--color-error); background: var(--color-error-soft); }

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.flight-card {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  color: inherit;
  background: var(--color-white);
}

.flight-card:has(.flight-card__main[href]) { transition: border-color 120ms ease, box-shadow 120ms ease, transform 120ms ease; }
.flight-card:has(.flight-card__main[href]):hover { border-color: var(--color-accent); box-shadow: 0 0.8rem 2rem rgba(35, 91, 140, 0.12); transform: translateY(-2px); }

.flight-card__main {
  display: block;
  padding: var(--space-4);
  color: inherit;
  text-decoration: none;
}

.flight-card__main:focus-visible { position: relative; z-index: 1; outline-offset: -4px; }

.flight-card--cheapest {
  border-color: var(--color-accent);
  background: linear-gradient(180deg, var(--color-soft), var(--color-white) 7rem);
  box-shadow: inset 0 0 0 2px var(--color-accent), 0 1rem 2.5rem rgba(35, 91, 140, 0.13);
}

.flight-card__labels { display: flex; min-height: 1.7rem; flex-wrap: wrap; gap: 0.4rem; margin-bottom: var(--space-2); }
.flight-card__label {
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  color: var(--color-accent-dark);
  background: #d8edff;
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.flight-card__deal { padding: 0.25rem 0.55rem; border-radius: 999px; font-size: 0.8125rem; font-weight: 800; }
.flight-card__deal--great-deal { color: #17633b; background: #e1f6e9; }
.flight-card__deal--fair-price { color: #755510; background: #fff4ce; }
.flight-card__deal--expensive { color: #8b3039; background: #ffe7e9; }

.flight-card__route { margin-bottom: var(--space-3); font-size: 1rem; }
.flight-card__price { margin-bottom: var(--space-2); color: var(--color-accent-dark); font-size: 1.75rem; font-weight: 800; letter-spacing: -0.03em; }
.flight-card__rank { margin: calc(var(--space-2) * -1) 0 var(--space-2); color: var(--color-muted); font-size: 0.8125rem; font-weight: 700; }
.flight-card__airline { margin-bottom: 0.2rem; font-weight: 700; }
.flight-card__flight-number { margin-bottom: 0.2rem; color: var(--color-muted); font-size: 0.875rem; font-weight: 700; }
.flight-card__dates { margin-bottom: var(--space-2); color: var(--color-accent-dark); font-size: 0.875rem; font-weight: 800; }
.flight-card__details { margin-bottom: 0; color: var(--color-muted); font-size: 0.875rem; text-transform: capitalize; }
.flight-card__layovers { display: grid; gap: 0.2rem; margin: var(--space-2) 0 0; padding: 0; color: var(--color-muted); font-size: 0.875rem; list-style: none; }
.flight-card__layover::before { content: "Stop: "; color: var(--color-ink); font-weight: 700; }
.flight-card__legs { display: grid; gap: var(--space-2); margin-top: var(--space-3); }
.flight-leg { padding: var(--space-3); border: 1px solid var(--color-line); border-radius: var(--radius-small); background: color-mix(in srgb, var(--color-soft) 45%, var(--color-white)); }
.flight-leg__label { margin-bottom: 0.2rem; color: var(--color-accent-dark); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; }
.flight-leg__route { margin: 0 0 var(--space-2); font-size: 1rem; }
.flight-leg .flight-card__dates { margin-bottom: 0.4rem; }
.saved-flight-card__legacy-note { margin: var(--space-2) 0 0; color: var(--color-muted); font-size: 0.8125rem; }
.flight-card__purchase { display: inline-block; margin-top: var(--space-3); color: var(--color-accent-dark); font-size: 0.875rem; font-weight: 800; }
.flight-card__purchase--unavailable { color: var(--color-muted); font-weight: 600; }

.flight-card__actions {
  display: flex;
  padding: 0 var(--space-4) var(--space-4);
}

.secondary-button, .remove-button, .purchase-button {
  min-height: 2.75rem;
  border-radius: var(--radius-small);
  padding: 0.65rem 1rem;
  font-weight: 800;
}

.secondary-button {
  width: 100%;
  border: 1px solid var(--color-accent);
  color: var(--color-accent-dark);
  background: var(--color-white);
  cursor: pointer;
}

.secondary-button:hover:not(:disabled) { background: var(--color-soft); }
.secondary-button:disabled { color: var(--color-muted); border-color: var(--color-line); background: #f5f8fb; cursor: default; }

.watchlist-section {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-line);
}

.watchlist-section__header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
}

.watchlist-section h2 { margin-bottom: 0; font-size: 1.75rem; }
.watchlist-note { max-width: 25rem; margin-bottom: 0.2rem; color: var(--color-muted); font-size: 0.875rem; text-align: right; }
.watchlist-status { min-height: 1.6rem; margin: var(--space-3) 0; color: var(--color-muted); }
.watchlist-status--empty { padding: var(--space-4); border: 1px dashed #bfd1e2; border-radius: var(--radius-large); background: color-mix(in srgb, var(--color-soft) 55%, white); }
.watchlist-status--error { padding: var(--space-3); border-radius: var(--radius-small); color: var(--color-error); background: var(--color-error-soft); }

.watchlist-list { display: grid; gap: var(--space-3); }

.saved-flight-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  background: var(--color-white);
  box-shadow: 0 0.5rem 1.5rem rgba(35, 91, 140, 0.06);
}

.saved-flight-card__summary { min-width: 0; }
.saved-flight-card__route { margin-bottom: 0.3rem; font-size: 1.05rem; }
.saved-flight-card__price { margin-bottom: 0.25rem; color: var(--color-accent-dark); font-size: 1.5rem; font-weight: 800; }
.saved-flight-card__airline { margin-bottom: 0.2rem; font-weight: 700; }
.saved-flight-card__details { margin-bottom: 0; color: var(--color-muted); font-size: 0.875rem; }
.saved-flight-card__actions { display: grid; min-width: 12rem; gap: var(--space-2); }

.purchase-button {
  display: grid;
  place-items: center;
  color: var(--color-white);
  background: var(--color-accent);
  text-align: center;
  text-decoration: none;
}

.purchase-button:hover { background: var(--color-accent-dark); }

.remove-button {
  border: 1px solid #d7a7ad;
  color: var(--color-error);
  background: var(--color-white);
  cursor: pointer;
}

.remove-button:hover { background: var(--color-error-soft); }
.saved-flight-card__unavailable { color: var(--color-muted); font-size: 0.8125rem; text-align: center; }

@media (max-width: 48rem) {
  .search-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .results-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 31rem) {
  .site-header { align-items: flex-start; }
  .brand { max-width: 13rem; }
  .search-panel { padding: var(--space-4); }
  .search-form, .results-grid { grid-template-columns: 1fr; }
  .test-control, #search-button { grid-column: auto; }
  .watchlist-section__header { display: block; }
  .watchlist-note { margin-top: var(--space-2); text-align: left; }
  .saved-flight-card { grid-template-columns: 1fr; }
  .saved-flight-card__actions { min-width: 0; }
}