/* ── Reset & base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue: #1d4ed8;
  --blue-light: #eff6ff;
  --green: #15803d;
  --green-light: #f0fdf4;
  --orange: #c2410c;
  --orange-light: #fff7ed;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 14px;
  --shadow: 0 2px 12px rgba(0,0,0,.07);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.11);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ───────────────────────────────────────────────────── */
header {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--gray-900);
}

.logo-icon { font-size: 1.4rem; }
.accent { color: var(--blue); }

nav { display: flex; gap: .2rem; }

.nav-btn {
  background: none;
  border: none;
  padding: .4rem .8rem;
  border-radius: 8px;
  font-size: .88rem;
  cursor: pointer;
  color: var(--gray-500);
  transition: background .12s, color .12s;
}

.nav-btn:hover { background: var(--gray-100); color: var(--gray-900); }
.nav-btn.active { background: var(--blue-light); color: var(--blue); font-weight: 600; }

/* ── Main / Tabs ──────────────────────────────────────────────── */
main {
  flex: 1;
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

.tab { display: none; }
.tab.active { display: block; }

/* ── Hero ─────────────────────────────────────────────────────── */
.hero { text-align: center; margin-bottom: 1.75rem; }

.hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: .5rem;
}

.hero-sub { color: var(--gray-400); font-size: 1rem; }

/* ── Search card ──────────────────────────────────────────────── */
.search-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.75rem;
  border: 1px solid var(--gray-200);
}

.search-row {
  display: flex;
  gap: .6rem;
  align-items: flex-end;
  flex-wrap: wrap;
}

.search-field {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  flex: 1;
  min-width: 140px;
}

.search-field label {
  font-size: .75rem;
  font-weight: 700;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.search-field input {
  border: 1.5px solid var(--gray-200);
  border-radius: 9px;
  padding: .65rem .9rem;
  font-size: .95rem;
  outline: none;
  transition: border-color .15s;
  width: 100%;
  background: white;
}

.search-field input:focus { border-color: var(--blue); }
.date-field { max-width: 175px; }

.swap-btn {
  background: var(--gray-100);
  border: 1.5px solid var(--gray-200);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  font-size: 1rem;
  cursor: pointer;
  flex-shrink: 0;
  margin-bottom: 2px;
  transition: background .12s;
}

.swap-btn:hover { background: var(--blue-light); }

.search-btn {
  background: var(--blue);
  color: white;
  border: none;
  border-radius: 9px;
  padding: .68rem 1.5rem;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: .4rem;
  height: 42px;
  transition: opacity .15s, transform .1s;
}

.search-btn:hover { opacity: .9; }
.search-btn:active { transform: scale(.98); }
.search-btn:disabled { opacity: .6; cursor: not-allowed; }

/* ── Autocomplete ─────────────────────────────────────────────── */
.autocomplete-wrap { position: relative; }

.suggestions {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: white;
  border: 1.5px solid var(--gray-200);
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  overflow: hidden;
}

.suggestion-item {
  padding: .6rem .9rem;
  cursor: pointer;
  font-size: .88rem;
  border-bottom: 1px solid var(--gray-100);
  transition: background .1s;
}

.suggestion-item:last-child { border-bottom: none; }
.suggestion-item:hover { background: var(--blue-light); }
.station-name { font-weight: 600; color: var(--gray-900); }
.station-label { font-size: .78rem; color: var(--gray-400); }

/* ── Results header ───────────────────────────────────────────── */
.results-header {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: 1rem;
}

.results-header h2 { font-size: 1.05rem; font-weight: 700; }

.cache-badge {
  background: var(--orange-light);
  color: var(--orange);
  font-size: .72rem;
  font-weight: 700;
  padding: .2rem .6rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

/* ── Summary comparison bar ───────────────────────────────────── */
.summary-bar {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
  margin-bottom: .85rem;
}

.summary-chip {
  display: flex;
  flex-direction: column;
  padding: .6rem 1rem;
  border-radius: 10px;
  border: 1.5px solid;
  min-width: 140px;
}

.summary-carrier { font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; margin-bottom: .15rem; }
.summary-price { font-size: .9rem; }
.summary-price strong { font-size: 1.1rem; }

.fare-info-note {
  font-size: .75rem;
  color: var(--gray-400);
  margin-bottom: .85rem;
  padding-left: .1rem;
}

/* ── Fare cards ───────────────────────────────────────────────── */
.fare-card {
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
  margin-bottom: .75rem;
  overflow: hidden;
  transition: box-shadow .15s;
}

.fare-card:hover { box-shadow: var(--shadow-lg); }

.fare-header {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .9rem 1.25rem;
  border-bottom: 1px solid var(--gray-100);
  flex-wrap: wrap;
}

.fare-carrier-badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  border: 1.5px solid;
  border-radius: 6px;
  padding: .2rem .65rem;
  font-size: .78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .05em;
  flex-shrink: 0;
}

.carrier-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.fare-route-label {
  flex: 1;
  font-size: .88rem;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: .4rem;
  flex-wrap: wrap;
}

.fare-station-name { font-weight: 600; }
.fare-arrow-sm { color: var(--gray-400); }

.fare-class-badge {
  font-size: .75rem;
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: 5px;
  padding: .15rem .5rem;
  font-weight: 600;
  flex-shrink: 0;
}

/* ── Fare profiles ────────────────────────────────────────────── */
.fare-profiles {
  padding: .5rem 1.25rem;
  border-bottom: 1px solid var(--gray-100);
}

.profile-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .35rem 0;
  font-size: .86rem;
  border-bottom: 1px solid var(--gray-100);
}

.profile-row:last-child { border-bottom: none; }

.profile-normal .profile-name { font-weight: 700; color: var(--gray-900); }
.profile-normal .profile-price { font-weight: 700; }

.profile-name { color: var(--gray-700); }

.profile-price {
  color: var(--green);
  font-weight: 600;
  white-space: nowrap;
}

.profile-max { color: var(--gray-400); font-weight: 400; font-size: .82rem; }

/* ── Fare footer ──────────────────────────────────────────────── */
.fare-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .8rem 1.25rem;
}

.fare-best-price {
  display: flex;
  flex-direction: column;
}

.price-label { font-size: .72rem; color: var(--gray-400); font-weight: 600; text-transform: uppercase; letter-spacing: .05em; }
.price-big { font-size: 1.6rem; font-weight: 800; color: var(--green); line-height: 1.1; }

.book-btn {
  background: var(--blue);
  color: white;
  border: none;
  border-radius: 8px;
  padding: .55rem 1.2rem;
  font-size: .88rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: opacity .15s;
  white-space: nowrap;
}

.book-btn:hover { opacity: .88; }

/* ── TER card ─────────────────────────────────────────────────── */
.ter-card {
  background: white;
  border: 1.5px solid #fde68a;
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  box-shadow: var(--shadow);
}

.ter-icon { font-size: 2.2rem; flex-shrink: 0; }

.ter-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: .4rem;
}

.ter-hint {
  font-size: .9rem;
  color: var(--gray-700);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.ter-actions {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
  margin-bottom: .85rem;
}

.ter-book-btn {
  display: inline-block;
  border-radius: 8px;
  padding: .55rem 1.1rem;
  font-size: .88rem;
  font-weight: 700;
  text-decoration: none;
  transition: opacity .15s;
  white-space: nowrap;
}

.ter-book-btn.primary { background: var(--blue); color: white; }
.ter-book-btn.secondary { background: var(--gray-100); color: var(--gray-700); border: 1.5px solid var(--gray-200); }
.ter-book-btn:hover { opacity: .85; }

.ter-tip {
  font-size: .82rem;
  color: var(--gray-500);
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 8px;
  padding: .6rem .85rem;
  line-height: 1.5;
}

/* ── Alert CTA ────────────────────────────────────────────────── */
.alert-cta {
  margin-top: 1.25rem;
  border-radius: var(--radius);
  background: var(--blue-light);
  border: 1.5px dashed #93c5fd;
}

.alert-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 1.25rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.alert-cta span { color: var(--blue); font-weight: 500; font-size: .9rem; }

.alert-cta button {
  background: var(--blue);
  color: white;
  border: none;
  border-radius: 8px;
  padding: .45rem 1.1rem;
  font-weight: 700;
  cursor: pointer;
  font-size: .88rem;
}

/* ── Error box ────────────────────────────────────────────────── */
.error-box {
  background: #fef2f2;
  border: 1.5px solid #fca5a5;
  color: #dc2626;
  border-radius: 9px;
  padding: .9rem 1.1rem;
  font-size: .9rem;
}

/* ── Tab header ───────────────────────────────────────────────── */
.tab-header { margin-bottom: 1.5rem; }
.tab-header h2 { font-size: 1.4rem; font-weight: 800; margin-bottom: .3rem; }
.tab-header p { color: var(--gray-400); }

/* ── Alert items ──────────────────────────────────────────────── */
.alert-item {
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
  padding: .9rem 1.1rem;
  margin-bottom: .6rem;
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}

.alert-route { font-weight: 700; font-size: .95rem; }

.alert-threshold {
  font-size: .82rem;
  background: var(--green-light);
  color: var(--green);
  padding: .2rem .6rem;
  border-radius: 20px;
  font-weight: 700;
}

.alert-delete-btn {
  background: none;
  border: 1.5px solid var(--gray-200);
  border-radius: 6px;
  padding: .3rem .7rem;
  cursor: pointer;
  color: var(--gray-400);
  font-size: .82rem;
  transition: border-color .12s, color .12s;
}

.alert-delete-btn:hover { border-color: #ef4444; color: #ef4444; }

/* ── Trending ─────────────────────────────────────────────────── */
.trending-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: .85rem; }

.trending-card {
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem;
  cursor: pointer;
  transition: box-shadow .15s;
}

.trending-card:hover { box-shadow: var(--shadow-lg); }
.trending-route { font-weight: 700; margin-bottom: .3rem; font-size: .95rem; }
.trending-searches { font-size: .78rem; color: var(--gray-400); }
.trending-price { font-size: .9rem; color: var(--green); font-weight: 700; margin-top: .35rem; }

/* ── Modal ────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: 1rem;
}

.modal {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
  max-width: 400px;
  width: 100%;
  position: relative;
}

.modal h3 { font-size: 1.25rem; font-weight: 800; margin-bottom: .2rem; }
.modal-route { color: var(--gray-400); font-size: .88rem; margin-bottom: 1.25rem; }

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  color: var(--gray-400);
}

.form-group { margin-bottom: 1.1rem; }
.form-group label { display: block; font-size: .82rem; font-weight: 700; margin-bottom: .35rem; }

.form-group input {
  width: 100%;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  padding: .6rem .85rem;
  font-size: .95rem;
  outline: none;
}

.form-group input:focus { border-color: var(--blue); }
.form-group small { display: block; color: var(--gray-400); font-size: .75rem; margin-top: .25rem; }

.modal-save-btn {
  width: 100%;
  background: var(--blue);
  color: white;
  border: none;
  border-radius: 8px;
  padding: .75rem;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity .15s;
}

.modal-save-btn:hover { opacity: .9; }

/* ── Utilities ────────────────────────────────────────────────── */
.hidden { display: none !important; }

.empty-state, .loading-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--gray-400);
}

.empty-state span { font-size: 2.2rem; display: block; margin-bottom: .6rem; }
.empty-state p { line-height: 1.6; }

.spinner {
  width: 17px;
  height: 17px;
  border: 2.5px solid rgba(255,255,255,.35);
  border-top-color: white;
  border-radius: 50%;
  animation: spin .65s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Footer ───────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 1.25rem;
  font-size: .78rem;
  color: var(--gray-400);
  border-top: 1px solid var(--gray-200);
  background: white;
}

footer a { color: var(--blue); text-decoration: none; }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 640px) {
  .hero h1 { font-size: 1.7rem; }
  .search-row { flex-direction: column; }
  .date-field { max-width: none; }
  .swap-btn { align-self: center; }
  .search-btn { width: 100%; justify-content: center; }
  .ter-card { flex-direction: column; }
  .fare-footer { flex-direction: column; align-items: flex-start; gap: .75rem; }
  .book-btn { width: 100%; text-align: center; }
}