:root {
  --bg: #0b1220;
  --card: #141e33;
  --card2: #1b2742;
  --text: #e8eefc;
  --muted: #8ea0c4;
  --accent: #38bdf8;
  --good: #22c55e;
  --busy: #f59e0b;
  --jam: #ef4444;
  --unknown: #475569;
  --radius: 18px;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font-family: system-ui, -apple-system, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  -webkit-text-size-adjust: 100%;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.app { max-width: 480px; margin: 0 auto; padding: 14px 14px 28px; display: flex; flex-direction: column; gap: 14px; }

.top h1 { font-size: 1.25rem; margin: 4px 2px 12px; letter-spacing: .5px; }
.top h1 span { color: var(--muted); font-weight: 500; font-size: 1rem; }

.dir-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.dir-switch button {
  appearance: none; border: 2px solid var(--card2); background: var(--card); color: var(--muted);
  border-radius: 14px; padding: 12px 8px; font-size: 1.15rem; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 2px; transition: all .15s;
}
.dir-switch button small { font-size: .8rem; }
.dir-switch button.active { border-color: var(--accent); background: #0c2a3f; color: #fff; }
.dir-switch button.active small { color: var(--accent); }

.advice {
  background: linear-gradient(135deg, #12304a, #141e33); border-radius: var(--radius);
  padding: 18px 16px 16px; text-align: center; border: 2px solid transparent;
}
.advice-label { margin: 0; color: var(--muted); font-size: 1rem; }
.advice-lane { margin: 4px 0 6px; font-size: clamp(2rem, 10vw, 2.6rem); font-weight: 800; line-height: 1.15; }
.advice-lane .side { display: block; font-size: 1.1rem; font-weight: 600; color: var(--muted); margin-top: 2px; }
.advice-reason { margin: 0; font-size: 1.05rem; }
.advice.c-strong { border-color: var(--good); }
.advice.c-moderate { border-color: var(--accent); }
.advice.c-slight { border-color: var(--card2); }
.advice.error .advice-lane { font-size: 1.4rem; color: var(--busy); }
.advice.loading .advice-lane { font-size: 1.4rem; color: var(--muted); }

.lanes { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.lane {
  background: var(--card); border-radius: var(--radius); padding: 12px; text-align: center;
  border: 2px solid transparent; position: relative; min-width: 0;
}
.lane.recommended { border-color: var(--accent); background: #10273d; }
.lane.recommended::after {
  content: "建議"; position: absolute; top: -10px; right: 10px; background: var(--accent); color: #002033;
  font-size: .75rem; font-weight: 700; padding: 2px 8px; border-radius: 999px;
}
.lane header { display: flex; justify-content: center; align-items: baseline; gap: 6px; }
.lane header b { font-size: 1.05rem; }
.lane header span { color: var(--muted); font-size: .85rem; }
.lane .speed { margin: 6px 0 2px; }
.lane .speed .v { font-size: clamp(2rem, 11vw, 2.6rem); font-weight: 800; font-variant-numeric: tabular-nums; }
.lane .speed .u { color: var(--muted); margin-left: 3px; }
.lane .time { font-size: 1rem; }
.lane .time b { font-size: 1.3rem; }
.lane .badge {
  display: inline-block; margin: 8px 0 6px; padding: 3px 12px; border-radius: 999px;
  font-weight: 700; background: var(--unknown); color: #fff;
}
.lane .badge.good { background: var(--good); color: #052e14; }
.lane .badge.busy { background: var(--busy); color: #3b2300; }
.lane .badge.jam { background: var(--jam); }
.lane .vol { color: var(--muted); font-size: .85rem; }

.segments { background: var(--card); border-radius: var(--radius); padding: 12px 12px 10px; }
.segments h2 { font-size: 1rem; margin: 0 0 8px; }
.seg-ends { display: flex; justify-content: space-between; color: var(--muted); font-size: .85rem; margin: 0 0 6px 38px; }
.seg-ends .arrow { color: var(--accent); }
.seg-row { display: flex; align-items: center; gap: 6px; margin-bottom: 6px; }
.seg-row em { width: 32px; font-style: normal; font-size: .8rem; color: var(--muted); }
.seg-bar { flex: 1; display: flex; gap: 2px; height: 26px; }
.seg-bar i { flex: 1; border-radius: 3px; background: var(--unknown); }
.seg-bar i.good { background: var(--good); }
.seg-bar i.busy { background: var(--busy); }
.seg-bar i.jam { background: var(--jam); }
.legend { display: flex; flex-wrap: wrap; gap: 10px; font-size: .75rem; color: var(--muted); margin-top: 6px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 4px; vertical-align: -1px; }
.legend i.good { background: var(--good); } .legend i.busy { background: var(--busy); }
.legend i.jam { background: var(--jam); } .legend i.unknown { background: var(--unknown); }

.notice { background: #2a1f08; color: #fde68a; border-radius: 14px; padding: 10px 12px; font-size: .95rem; line-height: 1.5; }

.foot { text-align: center; color: var(--muted); font-size: .85rem; }
.foot p { margin: 6px 0; }
.foot .stale { color: var(--busy); font-weight: 700; }
.foot button {
  appearance: none; border: 1px solid var(--card2); background: var(--card); color: var(--text);
  border-radius: 999px; padding: 8px 18px; font-size: .95rem; cursor: pointer;
}
.foot .src { font-size: .75rem; line-height: 1.5; margin-top: 10px; }

[data-theme='light'] { --bg: #f8fafc; --card: #ffffff; --card2: #f1f5f9; --text: #0f172a; --muted: #64748b; --accent: #0284c7; }
.alert-box { background: #ef444422; border-left: 4px solid var(--jam); margin: 10px 15px; padding: 10px; border-radius: 4px; font-size: 0.9em; }
.cctv-container { display: flex; overflow-x: auto; gap: 10px; padding: 15px; }
.cctv-card { flex: 0 0 80%; background: var(--card2); border-radius: 8px; overflow: hidden; }
.cctv-card img { width: 100%; display: block; }
.cctv-title { padding: 8px; font-size: 0.8em; text-align: center; color: var(--text); }
.btn-group { display: flex; gap: 10px; }
.btn-icon { background: none; border: none; font-size: 1.5em; cursor: pointer; }
.full-route { text-align: center; font-size: 0.85em; color: var(--muted); margin-top: 5px; }