:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --border: #dfe3e8;
  --text: #16181d;
  --text-dim: #61666e;
  --text-faint: #8b9098;
  --accent: #2f6feb;
  --urgent: #d1342f;
  --urgent-bg: #fdf0ef;
  --warn: #b06000;
  --warn-bg: #fdf5e8;
  --ok: #1a7f4b;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 20, 28, .06), 0 4px 12px rgba(16, 20, 28, .04);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a20;
    --surface-2: #1e222a;
    --border: #2a2f39;
    --text: #e8eaed;
    --text-dim: #a2a8b3;
    --text-faint: #6f7681;
    --accent: #5b8dff;
    --urgent: #ff6b63;
    --urgent-bg: #2a1917;
    --warn: #e6a54a;
    --warn-bg: #241d10;
    --ok: #4ac585;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 12px rgba(0, 0, 0, .2);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* --- top bar --- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 12px 20px;
  background: var(--surface); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 650; letter-spacing: -.01em; }
.topbar-actions { display: flex; align-items: center; gap: 8px; }
.scan-status { font-size: 13px; color: var(--text-faint); }

.btn {
  font: inherit; font-size: 14px; padding: 6px 12px;
  border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
}
.btn:hover { background: var(--surface-2); }
.btn:disabled { opacity: .5; cursor: default; }
.btn-ghost { background: transparent; }
.btn-sm { font-size: 13px; padding: 4px 9px; }
.btn-danger { color: var(--urgent); border-color: transparent; }
.btn-danger:hover { background: var(--urgent-bg); }

main { max-width: 860px; margin: 0 auto; padding: 20px; }
.loading { color: var(--text-faint); padding: 40px 0; text-align: center; }

/* --- headline --- */
.headline {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; margin-bottom: 24px;
  box-shadow: var(--shadow); font-size: 17px; font-weight: 550;
  letter-spacing: -.01em;
}
.headline.urgent {
  border-color: var(--urgent); background: var(--urgent-bg); color: var(--urgent);
}
.headline.today { border-color: var(--warn); background: var(--warn-bg); color: var(--warn); }

.section-title {
  font-size: 12px; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-faint); font-weight: 650; margin: 28px 0 10px;
}

/* --- trip grouping --- */
.trip { margin-bottom: 18px; }
.trip-head {
  display: flex; align-items: baseline; gap: 8px;
  font-size: 13px; color: var(--text-dim); margin-bottom: 8px; padding-left: 2px;
}
.trip-route { font-weight: 600; color: var(--text); }

/* --- flight card --- */
.flight {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  margin-bottom: 10px; overflow: hidden;
  border-left: 3px solid transparent;
}
.flight.u-boarding, .flight.u-leave-now { border-left-color: var(--urgent); }
.flight.u-today { border-left-color: var(--warn); }
.flight.u-past { opacity: .55; }
.flight.cancelled { opacity: .5; }
.flight.cancelled .route-code { text-decoration: line-through; }

.flight-main { padding: 14px 16px; }

.flight-top {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 12px;
}
.airline {
  font-size: 13px; color: var(--text-dim); font-weight: 550;
  display: flex; align-items: center; gap: 7px;
}
.flight-no {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px; background: var(--surface-2); color: var(--text-dim);
  padding: 2px 6px; border-radius: 5px;
}
.countdown { font-size: 13px; color: var(--text-dim); white-space: nowrap; font-variant-numeric: tabular-nums; }
.countdown.urgent { color: var(--urgent); font-weight: 650; }
.countdown.today { color: var(--warn); font-weight: 600; }

/* route */
.route { display: flex; align-items: center; gap: 14px; }
.route-end { flex: 1; min-width: 0; }
.route-end.to { text-align: right; }
.route-code {
  font-size: 26px; font-weight: 680; letter-spacing: -.02em; line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.route-time { font-size: 19px; font-weight: 600; font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.route-city, .route-date {
  font-size: 12px; color: var(--text-faint);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.route-mid {
  flex: 0 0 auto; display: flex; flex-direction: column;
  align-items: center; gap: 2px; color: var(--text-faint);
  min-width: 70px;
}
.route-line {
  width: 100%; height: 1px; background: var(--border); position: relative;
}
.route-line::after {
  content: "✈"; position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%); background: var(--surface);
  padding: 0 5px; font-size: 11px;
}
.route-dur { font-size: 11px; }

/* advice */
.advice {
  margin-top: 12px; padding: 9px 11px; border-radius: 7px;
  background: var(--surface-2); font-size: 13px; color: var(--text-dim);
}
.advice.urgent { background: var(--urgent-bg); color: var(--urgent); font-weight: 550; }
.advice.today { background: var(--warn-bg); color: var(--warn); font-weight: 550; }

/* detail chips */
.details {
  display: flex; flex-wrap: wrap; gap: 6px;
  padding: 0 16px 14px;
}
.chip {
  font-size: 12px; background: var(--surface-2); color: var(--text-dim);
  padding: 3px 8px; border-radius: 6px; white-space: nowrap;
}
.chip b { color: var(--text); font-weight: 600; }

.flight-actions {
  display: flex; gap: 6px; padding: 0 12px 12px; justify-content: flex-end;
}

.empty {
  text-align: center; color: var(--text-faint);
  padding: 48px 20px; background: var(--surface);
  border: 1px dashed var(--border); border-radius: var(--radius);
}
.empty h2 { font-size: 16px; font-weight: 600; color: var(--text-dim); margin: 0 0 6px; }
.empty p { margin: 0; font-size: 14px; }

.meta-foot {
  margin-top: 32px; padding-top: 16px; border-top: 1px solid var(--border);
  font-size: 12px; color: var(--text-faint); display: flex;
  justify-content: space-between; flex-wrap: wrap; gap: 8px;
}

details.past-wrap summary {
  cursor: pointer; font-size: 12px; text-transform: uppercase;
  letter-spacing: .06em; color: var(--text-faint); font-weight: 650;
  margin: 28px 0 10px; list-style: none;
}
details.past-wrap summary::-webkit-details-marker { display: none; }
details.past-wrap summary::before { content: "▸ "; }
details.past-wrap[open] summary::before { content: "▾ "; }

/* --- login --- */
.login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px;
}
.login-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 28px; width: 100%; max-width: 340px;
}
.login-card h1 { font-size: 20px; margin: 0 0 4px; letter-spacing: -.01em; }
.login-card .sub { font-size: 13px; color: var(--text-faint); margin: 0 0 20px; }
.field { margin-bottom: 12px; }
.field label {
  display: block; font-size: 12px; font-weight: 600;
  color: var(--text-dim); margin-bottom: 4px;
}
.field input {
  width: 100%; font: inherit; padding: 9px 11px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text);
}
.field input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
.btn-primary {
  width: 100%; background: var(--accent); color: #fff;
  border-color: var(--accent); padding: 10px; font-weight: 600; margin-top: 6px;
}
.btn-primary:hover { filter: brightness(1.08); background: var(--accent); }
.error-msg { color: var(--urgent); font-size: 13px; margin-top: 10px; min-height: 18px; }

@media (max-width: 560px) {
  main { padding: 14px; }
  .route-code { font-size: 22px; }
  .route-time { font-size: 17px; }
  .route-mid { min-width: 48px; }
  .topbar { padding: 10px 14px; }
  .scan-status { display: none; }
}

.scan-error {
  background: var(--urgent-bg); color: var(--urgent);
  border: 1px solid var(--urgent); border-radius: var(--radius);
  padding: 12px 14px; margin-bottom: 20px; font-size: 14px; font-weight: 550;
}
.scan-error small { font-weight: 400; opacity: .85; }