:root {
  color-scheme: light;
  --bg: #f5f7f8;
  --card: #ffffff;
  --text: #172126;
  --muted: #68757d;
  --border: #dbe2e6;
  --accent: #176b87;
  --accent-soft: #e3f2f6;
  --success: #176b45;
  --success-soft: #dff2e8;
  --placed-fill: #2f9b68;
  --placed-stroke: #0d5b38;
  --placed-label: #ffffff;
  --warning: #8a5b0f;
  --warning-soft: #fff0c7;
  --target: #e6ebee;
  --target-stroke: #6f818a;
  --map-bg: #fafbfb;
  --surface-soft: #f1f5f6;
  --piece-fill: #dce7eb;
  --piece-stroke: #48616d;
  --danger: #a44848;
  --radius: 18px;
}
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10181d;
  --card: #182329;
  --text: #eef5f7;
  --muted: #aebcc3;
  --border: #33454e;
  --accent: #72c7e3;
  --accent-soft: #173746;
  --success: #7dd7a8;
  --success-soft: #15392a;
  --placed-fill: #49b979;
  --placed-stroke: #b8f0cf;
  --placed-label: #08140e;
  --warning: #f1c46d;
  --warning-soft: #443519;
  --target: #26343b;
  --target-stroke: #8798a0;
  --map-bg: #121d22;
  --surface-soft: #202d33;
  --piece-fill: #31464f;
  --piece-stroke: #aec3cc;
  --danger: #ef9999;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", sans-serif; background: var(--bg); color: var(--text); }
button, input, select { font: inherit; }
button { touch-action: manipulation; }
.app-shell { max-width: 1440px; margin: 0 auto; padding: 24px; }
.screen { display: none; }
.screen.is-active { display: block; }
.topbar { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.topbar.compact h1 { font-size: clamp(1.6rem, 3vw, 2.35rem); }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 8px; font-size: clamp(2rem, 5vw, 3.6rem); line-height: 1.08; }
h2 { margin-bottom: 12px; }
.eyebrow { color: var(--accent); font-weight: 800; letter-spacing: .06em; margin-bottom: 8px; }
.subtitle, .hint, .source-note, .scale-note { color: var(--muted); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(300px, .8fr); gap: 22px; }
.hero-card, .settings-card, .piece-panel, .map-panel, .explorer-map-card, .county-list-card, .completion-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); }
.hero-card { padding: clamp(26px, 5vw, 64px); min-height: 520px; display: flex; flex-direction: column; justify-content: center; }
.hero-card h2 { font-size: clamp(1.6rem, 3vw, 2.5rem); max-width: 700px; }
.hero-card p { max-width: 720px; line-height: 1.75; }
.taiwan-mark { width: 86px; height: 86px; border-radius: 28px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font-size: 2rem; font-weight: 900; margin-bottom: 28px; }
.settings-card { padding: 28px; align-self: stretch; }
.switch-row { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 15px 0; border-bottom: 1px solid var(--border); }
.switch-row input { width: 22px; height: 22px; }
.progress-summary { margin-top: 24px; }
.progress-summary p { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; margin-bottom: 0; }
.primary-actions, .toolbar, .statusbar, .explorer-controls { display: flex; flex-wrap: wrap; gap: 10px; }
.primary-actions { margin-top: 24px; }
.primary-actions.centered { justify-content: center; }
.button, .chip { border: 1px solid var(--border); background: var(--card); color: var(--text); min-height: 44px; padding: 10px 16px; border-radius: 12px; cursor: pointer; }
.button:hover, .chip:hover { border-color: var(--accent); }
.button.primary { background: var(--accent); color: white; border-color: var(--accent); font-weight: 800; }
.button.ghost { background: transparent; }
.button:focus-visible, .chip:focus-visible, .piece-card:focus-visible, .target-region:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 35%, transparent); outline-offset: 2px; }
.source-note { margin-top: 18px; font-size: .9rem; }
.statusbar { align-items: center; padding: 12px 0 18px; }
.statusbar strong { margin-left: auto; }
.chip.is-on { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); color: var(--accent); font-weight: 700; }
.puzzle-layout { display: grid; grid-template-columns: minmax(290px, .72fr) minmax(0, 1.6fr); gap: 18px; }
.piece-panel, .map-panel { padding: 18px; min-width: 0; }
.panel-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.piece-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(125px, 1fr)); gap: 10px; max-height: 720px; overflow: auto; padding-right: 4px; }
.piece-card { border: 1px solid var(--border); background: var(--card); border-radius: 14px; min-height: 122px; padding: 8px; cursor: grab; display: grid; grid-template-rows: 80px auto; align-items: center; justify-items: center; color: var(--text); }
.piece-card:active { cursor: grabbing; }
.piece-card.is-selected { border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--accent) 35%, transparent); }
.piece-card svg { width: 100%; height: 76px; overflow: visible; }
.piece-card path { fill: var(--piece-fill); stroke: var(--piece-stroke); stroke-width: 1.3; vector-effect: non-scaling-stroke; }
.piece-card .piece-name { font-weight: 750; text-align: center; }
.piece-card.hide-label .piece-name { visibility: hidden; }
.taiwan-stage { display: grid; grid-template-columns: minmax(0, 1fr) 210px; gap: 12px; align-items: stretch; }
.main-map-box { min-width: 0; display: grid; place-items: center; min-height: 650px; background: var(--map-bg); border-radius: 16px; border: 1px dashed var(--border); }
.map-svg { width: 100%; height: auto; max-height: 720px; display: block; }
.target-region { fill: var(--target); stroke: var(--target-stroke); stroke-width: 1.3; vector-effect: non-scaling-stroke; cursor: pointer; transition: fill .18s ease, stroke .18s ease; }
.target-region:hover, .target-region.is-near { fill: var(--accent-soft); stroke: var(--accent); }
.target-region.is-placed { fill: var(--placed-fill); stroke: var(--placed-stroke); stroke-width: 2.1; }
.target-region.is-filtered { opacity: .18; pointer-events: none; }
.map-label { font-size: 11px; font-weight: 850; fill: var(--placed-label); paint-order: stroke; stroke: var(--placed-stroke); stroke-width: 3px; stroke-linejoin: round; pointer-events: none; }
.island-grid { display: grid; gap: 10px; }
.island-box { border: 1px dashed var(--border); border-radius: 14px; padding: 8px; background: var(--map-bg); }
.island-box > span { display: block; font-size: .9rem; font-weight: 800; color: var(--muted); }
.inset-svg { width: 100%; height: 118px; }
.scale-note { grid-column: 1 / -1; margin: 0; font-size: .88rem; }
.selected-name { color: var(--accent); font-weight: 800; }
.feedback { margin-top: 12px; border-radius: 12px; padding: 12px 14px; background: var(--surface-soft); color: var(--muted); min-height: 48px; }
.feedback.good { background: var(--success-soft); color: var(--success); font-weight: 700; }
.feedback.try { background: var(--warning-soft); color: var(--warning); font-weight: 700; }
.completion-card { max-width: 920px; margin: 40px auto; padding: clamp(28px, 6vw, 64px); text-align: center; }
.celebration { font-size: 4rem; margin-bottom: 12px; }
.completion-lead { color: var(--muted); font-size: 1.1rem; line-height: 1.8; max-width: 700px; margin: 0 auto 20px; }
.complete-map { max-width: 420px; margin: 0 auto 18px; }
.complete-map svg { width: 100%; }
.explorer-controls { margin-bottom: 16px; align-items: end; }
.explorer-controls label { display: grid; gap: 6px; font-weight: 700; }
.explorer-controls input, .explorer-controls select { min-height: 44px; border: 1px solid var(--border); border-radius: 10px; background: var(--card); color: var(--text); padding: 9px 12px; min-width: 220px; }
.explorer-layout { display: grid; grid-template-columns: minmax(320px, .85fr) minmax(0, 1.35fr); gap: 18px; }
.explorer-map-card, .county-list-card { padding: 18px; }
.explorer-map { max-height: 630px; }
.county-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 10px; }
.county-card { text-align: left; border: 1px solid var(--border); background: var(--card); border-radius: 14px; padding: 14px; cursor: pointer; min-height: 92px; }
.county-card:hover { border-color: var(--accent); }
.county-card .name { font-size: 1.05rem; font-weight: 850; }
.county-card .meta { display: flex; justify-content: space-between; gap: 8px; margin-top: 10px; color: var(--muted); font-size: .9rem; }
.progress-pill { padding: 3px 8px; background: var(--surface-soft); border-radius: 999px; }
.progress-pill.done { background: var(--success-soft); color: var(--success); }
.town-map-wrap { min-height: 650px; display: grid; place-items: center; background: var(--map-bg); border: 1px dashed var(--border); border-radius: 16px; }
dialog { border: 0; padding: 0; border-radius: 18px; max-width: min(92vw, 560px); }
dialog::backdrop { background: rgb(10 24 31 / .5); }
.dialog-card { padding: 28px; }
.dialog-card li { margin-bottom: 10px; line-height: 1.6; }
.drag-ghost { position: fixed; z-index: 9999; pointer-events: none; transform: translate(-50%, -50%); background: var(--card); border: 2px solid var(--accent); border-radius: 12px; padding: 8px 12px; font-weight: 800; box-shadow: 0 10px 30px rgb(0 0 0 / .18); }
.empty-state { grid-column: 1 / -1; padding: 30px; color: var(--muted); text-align: center; border: 1px dashed var(--border); border-radius: 14px; }
.error-card { max-width: 760px; margin: 50px auto; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; }
@media (max-width: 900px) {
  .hero-grid, .puzzle-layout, .explorer-layout { grid-template-columns: 1fr; }
  .taiwan-stage { grid-template-columns: 1fr; }
  .island-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .main-map-box, .town-map-wrap { min-height: 480px; }
  .piece-list { max-height: none; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); }
}
@media (max-width: 560px) {
  .app-shell { padding: 14px; }
  .topbar { flex-direction: column; }
  .statusbar strong { width: 100%; margin-left: 0; }
  .island-grid { grid-template-columns: 1fr; }
  .piece-list { display: flex; overflow-x: auto; overflow-y: hidden; padding-bottom: 8px; }
  .piece-card { min-width: 126px; }
  .main-map-box, .town-map-wrap { min-height: 420px; }
  .explorer-controls input, .explorer-controls select { min-width: min(88vw, 300px); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

.complete-region { fill: var(--placed-fill); stroke: var(--placed-stroke); stroke-width: 1.8; vector-effect: non-scaling-stroke; }
.setting-row { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 15px 0; border-bottom: 1px solid var(--border); }
.setting-row select { min-height: 44px; min-width: 120px; border: 1px solid var(--border); border-radius: 10px; background: var(--card); color: var(--text); padding: 8px 10px; }
html[data-theme="dark"] .button.primary { color: #081a20; }
html[data-theme="dark"] dialog { background: var(--card); color: var(--text); }
html[data-theme="dark"] dialog::backdrop { background: rgb(0 0 0 / .72); }