/* 公車可預測性與乘客體驗 — 四地比較 */
:root {
  color-scheme: light;
  --bg: #f6f3ec;
  --surface: #fcfcfb;
  --surface-2: #efeae0;
  --ink: #14171a;
  --ink-2: #4b4f54;
  --ink-3: #6b6f74;
  --line: #d9d3c5;
  --accent: #0f5d4a;
  --tw: #2a78d6;   /* 台灣 */
  --sg: #eb6834;   /* 新加坡 */
  --jp: #1baf7a;   /* 日本 */
  --hk: #eda100;   /* 香港 */
  --fact: #0f6b3f;
  --infer: #8a5a00;
  --unk: #8a2b2b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20,23,26,.06), 0 8px 24px rgba(20,23,26,.06);
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", "Heiti TC", system-ui, sans-serif;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121412;
  --surface: #1a1c1a;
  --surface-2: #232622;
  --ink: #f0efec;
  --ink-2: #c3c2b7;
  --ink-3: #9a9a90;
  --line: #34382f;
  --accent: #5fd0a8;
  --tw: #3987e5; --sg: #d95926; --jp: #199e70; --hk: #c98500;
  --fact: #6fd09a; --infer: #e6b34a; --unk: #ee8a8a;
  --shadow: none;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121412; --surface: #1a1c1a; --surface-2: #232622;
    --ink: #f0efec; --ink-2: #c3c2b7; --ink-3: #9a9a90; --line: #34382f;
    --accent: #5fd0a8;
    --tw: #3987e5; --sg: #d95926; --jp: #199e70; --hk: #c98500;
    --fact: #6fd09a; --infer: #e6b34a; --unk: #ee8a8a;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; overflow-wrap: anywhere; overflow-x: hidden; background: var(--bg); color: var(--ink); font: 16px/1.75 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-underline-offset: 3px; }
h1, h2, h3, h4 { line-height: 1.3; margin: 0; letter-spacing: .01em; }
.wrap { width: min(1180px, 92vw); margin-inline: auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 99; }

/* nav */
.topbar { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.topbar .wrap { display: flex; align-items: center; gap: 16px; height: 56px; }
.brand { font-weight: 800; white-space: nowrap; }
.topbar nav { display: flex; gap: 4px; overflow-x: auto; flex: 1; scrollbar-width: none; }
.topbar nav a { padding: 6px 12px; border-radius: 999px; color: var(--ink-2); text-decoration: none; font-size: 14px; white-space: nowrap; }
.topbar nav a:hover, .topbar nav a.on { background: var(--surface-2); color: var(--ink); }
.icon-btn { border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 999px; padding: 6px 12px; font: inherit; font-size: 14px; cursor: pointer; }

/* hero */
.hero { padding: 72px 0 40px; position: relative; overflow: hidden; }
.hero .eyebrow { color: var(--accent); font-weight: 700; letter-spacing: .12em; font-size: 13px; }
.hero h1 { font-size: clamp(34px, 6vw, 64px); margin: 12px 0 16px; font-weight: 900; }
.hero p.lead { font-size: clamp(17px, 2vw, 20px); color: var(--ink-2); max-width: 46em; }
.route-line { position: absolute; right: -40px; top: 30px; width: min(520px, 60vw); opacity: .9; pointer-events: none; }
.legend-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); font-size: 13px; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }

section { padding: 56px 0; }
section > .wrap > h2, .sec-title { font-size: clamp(26px, 3.6vw, 38px); font-weight: 800; }
.sec-sub { color: var(--ink-2); max-width: 52em; margin: 8px 0 28px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.gc { grid-template-columns: repeat(auto-fit, minmax(min(100%, 470px), 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); }

/* tags */
.tag { display: inline-block; font-size: 12px; font-weight: 700; padding: 1px 8px; border-radius: 6px; border: 1px solid currentColor; vertical-align: 1px; margin-right: 6px; white-space: nowrap; }
.tag.f { color: var(--fact); } .tag.i { color: var(--infer); } .tag.u { color: var(--unk); }
.tag.f::before { content: "✓ "; } .tag.i::before { content: "≈ "; } .tag.u::before { content: "？"; }

/* key findings */
.finding { display: flex; flex-direction: column; gap: 8px; }
.finding .num { font-size: 40px; font-weight: 900; line-height: 1; }
.finding .reg { font-size: 12px; font-weight: 700; color: var(--ink-3); letter-spacing: .08em; }
.finding p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* matrix */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 16px; }
.filters button { border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 999px; padding: 6px 14px; font: inherit; font-size: 14px; cursor: pointer; }
.filters button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.matrix-scroll { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); }
table.matrix { border-collapse: separate; border-spacing: 0; width: 100%; min-width: 980px; }
.matrix th, .matrix td { padding: 14px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); font-size: 14.5px; }
.matrix th:last-child, .matrix td:last-child { border-right: 0; }
.matrix tr:last-child td, .matrix tr:last-child th { border-bottom: 0; }
.matrix thead th { position: sticky; top: 0; background: var(--surface-2); font-size: 15px; }
.matrix tbody th { background: var(--surface-2); width: 150px; font-size: 15px; }
.matrix th .reg-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 8px; }
.matrix td .cell-btn { all: unset; cursor: pointer; display: block; width: 100%; }
.matrix td .cell-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 6px; }
.matrix td .cell-btn:hover .more { text-decoration: underline; }
.matrix .more { color: var(--accent); font-size: 13px; font-weight: 600; margin-top: 6px; display: inline-block; }
.matrix td.dim { opacity: .28; }
.matrix td ul { margin: 0; padding-left: 1.1em; }

/* charts */
.chart-card h3 { font-size: 19px; margin-bottom: 4px; }
.chart-card .cap { color: var(--ink-3); font-size: 13.5px; margin: 0 0 14px; }
.chart svg { width: 100%; height: auto; display: block; overflow: visible; }
.chart text { fill: var(--ink-2); font-family: var(--font); font-size: 13px; }
.chart .val { fill: var(--ink); font-weight: 700; }
.chart .grid line { stroke: var(--line); stroke-dasharray: 2 4; }
.chart .axis { stroke: var(--line); }
.chart-legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 13px; color: var(--ink-2); margin-top: 8px; }
.chart-legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.tip { position: fixed; z-index: 50; pointer-events: none; background: var(--ink); color: var(--bg); padding: 8px 12px; border-radius: 8px; font-size: 13px; max-width: 280px; line-height: 1.5; opacity: 0; transform: translateY(4px); transition: opacity .12s, transform .12s; }
.tip.on { opacity: 1; transform: none; }
.tbl-toggle { margin-top: 10px; font-size: 13px; }
details.data-table summary { cursor: pointer; color: var(--accent); font-size: 13px; margin-top: 8px; }
details.data-table table { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 8px; }
details.data-table th, details.data-table td { border-bottom: 1px solid var(--line); padding: 4px 8px; text-align: left; }

/* region detail */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.tabs button { border: 2px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 12px; padding: 10px 18px; font: inherit; font-weight: 700; cursor: pointer; }
.tabs button[aria-selected="true"] { border-color: var(--c); box-shadow: inset 0 -4px 0 var(--c); }
.region-panel[hidden] { display: none; }
.region-panel h3 { font-size: 24px; margin-bottom: 6px; }
.dim-block { border-top: 1px solid var(--line); padding: 20px 0; }
.dim-block h4 { font-size: 18px; margin-bottom: 10px; }
.dim-block ul { margin: 0; padding-left: 1.2em; }
.dim-block li { margin: 6px 0; }
.cross { background: var(--surface-2); border-radius: 10px; padding: 12px 16px; margin-top: 12px; font-size: 15px; }
.cross b { color: var(--accent); }
sup.src a { text-decoration: none; font-size: 11px; font-weight: 700; padding: 0 2px; }
.optable { width: 100%; border-collapse: collapse; font-size: 14px; margin: 10px 0; }
.optable th, .optable td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.optable th { background: var(--surface-2); }

/* recs */
.rec { display: flex; flex-direction: column; gap: 8px; border-left: 6px solid var(--c, var(--accent)); }
.rec h3 { font-size: 18px; }
.rec .meta { display: flex; flex-wrap: wrap; gap: 6px; font-size: 12.5px; }
.rec .meta span { background: var(--surface-2); border-radius: 6px; padding: 1px 8px; }
.rec p { margin: 0; font-size: 15px; color: var(--ink-2); }

/* sources */
.src-list { columns: 1; }
.src-group h3 { font-size: 20px; margin: 24px 0 8px; }
.src-item { padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 14px; word-break: break-word; }
.src-item .id { font-weight: 800; display: inline-block; min-width: 3.2em; }
.src-item .badge { font-size: 11.5px; padding: 0 6px; border-radius: 5px; border: 1px solid var(--line); color: var(--ink-3); margin-left: 6px; }
.src-item .badge.off { color: var(--fact); border-color: var(--fact); }
.src-item small { color: var(--ink-3); display: block; }

footer { padding: 40px 0 70px; color: var(--ink-3); font-size: 14px; border-top: 1px solid var(--line); }

/* modal */
dialog { border: 1px solid var(--line); border-radius: 16px; background: var(--surface); color: var(--ink); width: min(720px, 92vw); max-height: 86vh; padding: 0; box-shadow: 0 20px 60px rgba(0,0,0,.35); }
dialog::backdrop { background: rgba(0,0,0,.5); }
dialog .in { padding: 24px 26px; overflow: auto; max-height: 86vh; }
dialog .x { position: absolute; right: 12px; top: 10px; }

@media (max-width: 720px) {
  .hero { padding-top: 44px; }
  section { padding: 40px 0; }
  .route-line { display: none; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
@media print { .topbar, .filters, .tabs { display: none; } .region-panel[hidden] { display: block; } }