/* static/style.css — "Concourse Board": a rail/airport split-flap departure
   board at rush hour. Many rows scan and update at once, ranked by value;
   the best one settles and holds. That mechanism IS the product: many
   airport/date combinations get checked in parallel, cheapest floats up and
   stays lit. Matte black flap rows, brushed-steel chrome, one amber signal —
   deliberately not sky-blue/cloud travel-app iconography. See DESIGN.md.
   THESIS: the cheapest fare is a settled flap-row, not a dashboard metric card.
   OWN-WORLD: flap-black/steel-frame/signal-amber, Big Shoulders Display for
   flap-face numerals, IBM Plex Mono for data, IBM Plex Sans for body.
   STORY: Dima opens the tool, defines a wide search in one form, watches the
   board "run" live, and the settled cheapest row is unmistakable when it stops.
   FIRST VIEWPORT (results): best-price hero flap-card first, comparison tiles
   below it, full ranked list last.
   FORM: rail-concourse-split-flap-board world (assigned via concept-seed,
   challenger beat the grounded pick on mechanism fit), first-surface staging
   authored directly for this Operate tool. */

@import url('https://fonts.googleapis.com/css2?family=Big+Shoulders+Display:wght@700;800;900&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

:root {
  --flap-black: #0d0d0f;
  --flap-shadow: #17181c;
  --flap-shadow-raised: #1e2025;
  --flap-white: #f2f2f2;
  --steel-frame: #b6bbc2;
  --steel-frame-dim: rgba(182, 187, 194, 0.18);
  --steel-dark: #7d838c;
  --signal-amber: #ffb400;
  --signal-amber-dim: rgba(255, 180, 0, 0.16);
  --alert-red: #d32f2f;
  --alert-red-dim: rgba(211, 47, 47, 0.16);
  --success-green: #4caf7d;

  --font-display: 'Big Shoulders Display', 'Arial Narrow', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;

  --radius: 3px;
}

* { box-sizing: border-box; }

html, body { max-width: 100%; overflow-x: hidden; }

body {
  margin: 0;
  background: var(--flap-black);
  background-image: radial-gradient(ellipse at top, rgba(255, 255, 255, 0.03), transparent 60%);
  color: var(--flap-white);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--signal-amber-dim); color: var(--flap-white); }

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

a { color: inherit; }

/* ---------------------------------------------------------------
   Topbar — brushed-steel rail, split-flap wordmark.
   --------------------------------------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 2rem;
  background: linear-gradient(180deg, var(--flap-shadow-raised), var(--flap-shadow));
  border-bottom: 1px solid var(--steel-frame-dim);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.4);
}

.wordmark { display: flex; text-decoration: none; }

.wordmark-flap {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--flap-white);
  background: var(--flap-black);
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--steel-frame-dim);
}

.wordmark-flap-amber { color: var(--signal-amber); border-left: none; }

.topnav { display: flex; align-items: center; gap: 0.5rem; }

.topnav-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--steel-dark);
  padding: 0.55rem 0.9rem;
  border: 1px solid transparent;
  transition: color 150ms ease-out, border-color 150ms ease-out;
}

.topnav-link:hover { color: var(--flap-white); }
.topnav-link.active { color: var(--signal-amber); border-color: var(--signal-amber-dim); background: var(--signal-amber-dim); }
.topnav-logout { color: var(--steel-dark); }

/* ---------------------------------------------------------------
   Page shell
   --------------------------------------------------------------- */

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ---------------------------------------------------------------
   Flap card — the base surface unit. Mechanical, not glassy: thin
   steel hairline, minimal radius, a soft drop shadow with real offset.
   --------------------------------------------------------------- */

.flap-card {
  background: var(--flap-shadow);
  border: 1px solid var(--steel-frame-dim);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  box-shadow: 0 8px 24px -12px rgba(0, 0, 0, 0.6);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  font-size: 1.6rem;
  margin: 0 0 0.35rem;
}

.section-title-sm {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 1.15rem;
  margin: 0 0 1rem;
}

.section-sub {
  color: var(--steel-dark);
  font-size: 0.9rem;
  margin: 0 0 1.5rem;
}

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

.form-row { margin-bottom: 1.25rem; }
.form-row-split { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.form-row-quad { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }

.field { display: flex; flex-direction: column; gap: 0.4rem; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--steel-dark);
}

.field input, .field select,
.chip-field input {
  background: var(--flap-black);
  border: 1px solid var(--steel-frame-dim);
  border-radius: var(--radius);
  color: var(--flap-white);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.65rem 0.75rem;
  width: 100%;
}

.field input:focus, .field select:focus, .chip-field input:focus {
  outline: none;
  border-color: var(--signal-amber);
}

.field-checkbox { justify-content: flex-end; }
.checkbox-label { display: flex; align-items: center; gap: 0.5rem; font-family: var(--font-body); color: var(--steel-dark); font-size: 0.8rem; text-transform: none; letter-spacing: normal; }
.checkbox-label input { width: auto; }

.chip-field label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--steel-dark);
  display: block;
  margin-bottom: 0.4rem;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  background: var(--flap-black);
  border: 1px solid var(--steel-frame-dim);
  border-radius: var(--radius);
  padding: 0.5rem;
  min-height: 3rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--signal-amber-dim);
  color: var(--signal-amber);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  padding: 0.3rem 0.4rem 0.3rem 0.6rem;
  border: 1px solid rgba(255, 180, 0, 0.35);
  border-radius: var(--radius);
}

.chip-remove {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0 0.2rem;
}

.chip-list input {
  flex: 1;
  min-width: 90px;
  background: none;
  border: none;
  color: var(--flap-white);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.3rem;
}
.chip-list input:focus { outline: none; }

.form-error {
  background: var(--alert-red-dim);
  border: 1px solid rgba(211, 47, 47, 0.4);
  color: #ff8a8a;
  font-size: 0.85rem;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius);
  margin: 0 0 1rem;
}

/* Buttons — rectangular, tracked-out, steel by default, amber fill for the
   single primary action. */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--steel-frame-dim);
  background: transparent;
  color: var(--flap-white);
  cursor: pointer;
  text-decoration: none;
  transition: border-color 150ms ease-out, background 150ms ease-out, color 150ms ease-out;
}

.btn:hover { border-color: var(--steel-frame); }

.btn-primary {
  background: var(--signal-amber);
  border-color: var(--signal-amber);
  color: #1a1300;
}
.btn-primary:hover { background: #ffc233; border-color: #ffc233; }

.btn-ghost { color: var(--steel-dark); border-color: var(--steel-frame-dim); }
.btn-ghost:hover { color: var(--flap-white); }

.btn-block { width: 100%; margin-top: 0.5rem; }
.btn-large { padding: 1rem 2rem; font-size: 0.85rem; margin-top: 0.5rem; }
.btn-small { padding: 0.45rem 0.9rem; font-size: 0.7rem; }

/* ---------------------------------------------------------------
   Login
   --------------------------------------------------------------- */

.login-body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--flap-black);
  font-family: var(--font-body);
}

.login-card { width: 100%; max-width: 360px; display: flex; flex-direction: column; gap: 0.75rem; }
.login-wordmark { justify-content: center; margin-bottom: 1rem; }
.login-card label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--steel-dark);
}
.login-card input {
  background: var(--flap-black);
  border: 1px solid var(--steel-frame-dim);
  border-radius: var(--radius);
  color: var(--flap-white);
  font-family: var(--font-mono);
  padding: 0.75rem;
}
.login-card input:focus { outline: none; border-color: var(--signal-amber); }

/* ---------------------------------------------------------------
   Saved searches
   --------------------------------------------------------------- */

.saved-search-list { list-style: none; margin: 0; padding: 0; }
.saved-search-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--steel-frame-dim);
}
.saved-search-row:last-child { border-bottom: none; }
.saved-search-name { display: block; font-weight: 600; font-size: 0.95rem; }
.saved-search-meta { display: block; font-family: var(--font-mono); font-size: 0.75rem; color: var(--steel-dark); margin-top: 0.2rem; }
.saved-search-actions { display: flex; align-items: center; gap: 0.75rem; flex-shrink: 0; }
.saved-search-price { font-family: var(--font-mono); color: var(--signal-amber); font-weight: 600; }

/* ---------------------------------------------------------------
   Live search — the flap-cascade readout during a running search.
   --------------------------------------------------------------- */

.live-search { text-align: center; padding: 3rem 2rem; }

.live-status-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  color: var(--steel-dark);
  margin: 0 0 2rem;
}

.live-readout { display: flex; justify-content: center; gap: 4rem; flex-wrap: wrap; margin-bottom: 2rem; }
.live-readout-block { display: flex; flex-direction: column; align-items: center; }

.live-readout-value {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 3.5rem;
  line-height: 1;
  color: var(--flap-white);
  background: var(--flap-black);
  border: 1px solid var(--steel-frame-dim);
  padding: 0.4rem 1rem;
  min-width: 3.5ch;
  display: inline-block;
}

.live-readout-amber { color: var(--signal-amber); }
.live-readout-total { background: transparent; border: none; color: var(--steel-dark); font-size: 2rem; }
.live-readout-sep { font-family: var(--font-display); font-size: 2rem; color: var(--steel-dark); margin: 0 0.5rem; align-self: center; }

.live-readout-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--steel-dark);
  margin-top: 0.6rem;
}

@keyframes flap-flip {
  0% { transform: rotateX(90deg); opacity: 0.3; }
  100% { transform: rotateX(0deg); opacity: 1; }
}
.flap-flip { animation: flap-flip 220ms ease-out; transform-origin: center top; }
@media (prefers-reduced-motion: reduce) { .flap-flip { animation: none; } }

.live-progress-track {
  height: 4px;
  background: var(--flap-black);
  border: 1px solid var(--steel-frame-dim);
  max-width: 420px;
  margin: 0 auto;
}
.live-progress-fill { height: 100%; background: var(--signal-amber); transition: width 300ms ease-out; }

.live-hint { color: var(--steel-dark); font-size: 0.8rem; margin: 1.5rem 0 0; }

/* ---------------------------------------------------------------
   Status dot — square row-lamp, not a circle.
   --------------------------------------------------------------- */

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--steel-dark);
  flex-shrink: 0;
}
.status-dot-amber { background: var(--signal-amber); box-shadow: 0 0 6px var(--signal-amber); }
.status-dot-red { background: var(--alert-red); box-shadow: 0 0 6px var(--alert-red); }
.status-dot-green { background: var(--success-green); box-shadow: 0 0 6px var(--success-green); }
.status-dot-pulse { animation: dot-pulse 1.4s ease-in-out infinite; }
@keyframes dot-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---------------------------------------------------------------
   Best-price hero — the one number that matters, unmissable.
   --------------------------------------------------------------- */

.best-price-hero { text-align: center; padding: 2.5rem 2rem; border-color: rgba(255, 180, 0, 0.3); }

.best-price-eyebrow {
  display: block;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.75rem;
  color: var(--signal-amber);
  margin-bottom: 0.75rem;
}

.best-price-amount {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(3.5rem, 10vw, 6rem);
  line-height: 1;
  color: var(--signal-amber);
  text-shadow: 0 0 40px rgba(255, 180, 0, 0.25);
}

.best-price-currency { font-size: 0.4em; vertical-align: middle; color: var(--steel-dark); }

.best-price-route {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.75rem;
  text-transform: uppercase;
  margin-top: 0.75rem;
}

.best-price-dates {
  font-family: var(--font-mono);
  color: var(--steel-dark);
  font-size: 0.9rem;
  margin: 0.4rem 0 1.5rem;
}

.best-price-disclaimer {
  font-family: var(--font-mono);
  color: var(--steel-dark);
  font-size: 0.72rem;
  max-width: 46ch;
  margin: 1rem auto 0;
  line-height: 1.5;
}

.best-price-verify {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  max-width: 50ch;
  margin: 1rem auto 0;
  line-height: 1.5;
  text-align: left;
}

.best-price-verify-ok { color: var(--success-green); }
.best-price-verify-warn { color: #ff8a8a; }
.best-price-verify .status-dot { margin-top: 0.3rem; flex-shrink: 0; }

/* ---------------------------------------------------------------
   Comparison tiles
   --------------------------------------------------------------- */

.compare-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--steel-frame-dim);
  border: 1px solid var(--steel-frame-dim);
}

.compare-tile {
  border-radius: 0;
  border: none;
  box-shadow: none;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.compare-tile-amber { background: var(--signal-amber-dim); }

.compare-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--steel-dark);
}

.compare-value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  text-transform: uppercase;
}

.compare-sub { font-family: var(--font-mono); font-size: 0.75rem; color: var(--steel-dark); }

/* ---------------------------------------------------------------
   Results list — ruled flap-board rows on desktop, stacked flap-cards
   on mobile (same markup, see media query).
   --------------------------------------------------------------- */

.results-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; margin-bottom: 1rem; }

.results-filter-bar { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.results-filter-bar select {
  background: var(--flap-black);
  border: 1px solid var(--steel-frame-dim);
  border-radius: var(--radius);
  color: var(--flap-white);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.5rem 0.6rem;
}

.results-list { border-top: 1px solid var(--steel-frame-dim); }

.results-row {
  display: grid;
  grid-template-columns: 1fr 1.3fr 1.6fr 1.2fr 0.8fr 0.8fr auto;
  gap: 1rem;
  align-items: center;
  padding: 0.85rem 0.25rem;
  border-bottom: 1px solid var(--steel-frame-dim);
  font-size: 0.85rem;
}

.results-row-head {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.68rem;
  color: var(--steel-dark);
  padding-bottom: 0.6rem;
}

.results-row-head-runs { grid-template-columns: 1.4fr 1fr 1fr 1fr auto; }

.results-price { font-family: var(--font-mono); font-weight: 600; color: var(--signal-amber); }
.results-row-best .results-price { font-size: 1rem; }
.results-route { font-family: var(--font-display); font-weight: 700; letter-spacing: 0.01em; }
.results-dates, .results-airline, .results-time { font-family: var(--font-mono); color: var(--steel-dark); font-size: 0.8rem; }
.results-stops { font-family: var(--font-mono); font-size: 0.8rem; }

.results-row-best { background: var(--signal-amber-dim); border-bottom-color: rgba(255, 180, 0, 0.35); }

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

.state-error, .state-empty { text-align: center; padding: 3rem 2rem; }
.state-error .status-dot, .state-empty .status-dot { width: 12px; height: 12px; margin-bottom: 1rem; }

/* ---------------------------------------------------------------
   Mobile
   --------------------------------------------------------------- */

@media (max-width: 760px) {
  .topbar { padding: 1rem; }
  .page { padding: 1.25rem; gap: 1.25rem; }
  .flap-card { padding: 1.25rem; }

  .form-row-split, .form-row-quad { grid-template-columns: 1fr; }
  .field-checkbox { align-items: flex-start; }

  .live-readout { gap: 2rem; }
  .live-readout-value { font-size: 2.25rem; }

  .best-price-amount { font-size: 3.25rem; }

  .compare-grid { grid-template-columns: 1fr 1fr; }

  .results-row-head { display: none; }
  .results-row {
    grid-template-columns: 1fr;
    gap: 0.3rem;
    padding: 1rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--steel-frame-dim);
    border-bottom: 1px solid var(--steel-frame-dim);
  }
  .results-row > [data-label]::before {
    content: attr(data-label);
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--steel-dark);
    width: 5.5rem;
  }
  .results-price { order: -1; font-size: 1.3rem; }
  .results-price::before { display: none !important; }
  .results-row .btn { margin-top: 0.5rem; width: 100%; }
}