:root{color-scheme:light;--bg: #f1f5f9;--bg-elevated: #ffffff;--bg-muted: #e2e8f0;--text: #0f172a;--text-muted: #64748b;--border: #cbd5e1;--accent: #2563eb;--accent-hover: #1d4ed8;--accent-soft: #dbeafe;--success: #16a34a;--success-soft: #dcfce7;--danger: #dc2626;--danger-soft: #fee2e2;--shadow: 0 8px 30px rgba(15, 23, 42, .12);--radius: 16px;--header-h: 52px;--choice-h: auto;--safe-bottom: env(safe-area-inset-bottom, 0px);--font: system-ui, -apple-system, "Segoe UI", "PingFang HK", "Noto Sans TC", "Microsoft JhengHei", sans-serif}[data-theme=dark]{color-scheme:dark;--bg: #0b1220;--bg-elevated: #111827;--bg-muted: #1f2937;--text: #f8fafc;--text-muted: #94a3b8;--border: #334155;--accent: #3b82f6;--accent-hover: #60a5fa;--accent-soft: #1e3a8a;--success: #22c55e;--success-soft: #14532d;--danger: #f87171;--danger-soft: #7f1d1d;--shadow: 0 8px 30px rgba(0, 0, 0, .45)}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;font-family:var(--font);background:var(--bg);color:var(--text);-webkit-tap-highlight-color:transparent;overflow:hidden}#app{height:100%;height:100dvh;display:flex;flex-direction:column;position:relative}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}.header{flex:0 0 var(--header-h);display:flex;align-items:center;gap:.75rem;padding:0 .75rem;padding-left:max(.75rem,env(safe-area-inset-left));padding-right:max(.75rem,env(safe-area-inset-right));background:var(--bg-elevated);border-bottom:1px solid var(--border);z-index:40}.brand{display:flex;align-items:center;gap:.4rem;font-weight:700;letter-spacing:-.02em}.brand-mark{font-size:1.25rem}.brand-name{font-size:1.05rem}.header-meta{margin-left:auto;font-size:.875rem;font-weight:600;color:var(--text-muted);background:var(--bg-muted);padding:.25rem .65rem;border-radius:999px}.theme-toggle{margin-left:.25rem;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:var(--bg-muted);font-size:1.1rem}.theme-toggle:hover{outline:2px solid var(--accent)}[data-theme=light] .theme-icon-sun,[data-theme=dark] .theme-icon-moon{display:none}.screen{flex:1;min-height:0;display:flex;flex-direction:column;overflow:auto}.screen[hidden]{display:none!important}.screen-start{align-items:center;justify-content:center;padding:1.5rem;background:radial-gradient(ellipse at top,var(--accent-soft),transparent 55%),var(--bg)}.hero{width:min(100%,420px);text-align:center}.hero-title{margin:0 0 .35rem;font-size:clamp(2.4rem,10vw,3.2rem);letter-spacing:-.04em}.hero-tagline{margin:0 0 1rem;font-size:1.15rem;color:var(--text-muted)}.hero-desc{margin:0 0 .75rem;line-height:1.55;color:var(--text-muted)}.hero-hint{margin:0 0 1.75rem;font-size:.95rem;color:var(--accent, #38bdf8);font-weight:500}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;min-height:44px;padding:.65rem 1.15rem;border-radius:12px;font-weight:600;font-size:.95rem;transition:background .15s,transform .1s,opacity .15s}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-lg{min-height:52px;padding:.85rem 1.6rem;font-size:1.05rem;border-radius:14px}.btn-block{width:100%}.screen-play{overflow:hidden;position:relative}.street-panel{flex:1;min-height:0;position:relative;background:#0b1220}.streetview{position:absolute;top:0;right:0;bottom:0;left:0;overflow:hidden}.streetview img.street-photo{width:100%;height:100%;object-fit:cover;display:block;-webkit-user-select:none;user-select:none;-webkit-user-drag:none}.streetview .pano-root{width:100%;height:100%}.streetview-loading,.streetview-error{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;padding:1.25rem;text-align:center;color:#e2e8f0;background:#0f172a}.street-credit{position:absolute;left:.5rem;bottom:.5rem;z-index:3;font-size:.7rem;color:#fff;background:#00000073;padding:.2rem .45rem;border-radius:6px;pointer-events:none}.choice-sheet{flex:0 0 auto;background:var(--bg-elevated);border-top:1px solid var(--border);box-shadow:0 -4px 24px #00000014;padding:.85rem .85rem calc(.85rem + var(--safe-bottom));z-index:6}.choice-prompt{margin:0 0 .65rem;font-size:.95rem;font-weight:600;color:var(--text-muted);text-align:center}.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:.65rem}@media(min-width:420px)and (max-width:899px){.choice-grid{grid-template-columns:1fr 1fr 1fr}}.choice-btn{min-height:52px;padding:.75rem .85rem;border-radius:14px;border:2px solid var(--border);background:var(--bg-muted);font-size:1.05rem;font-weight:700;text-align:center;transition:border-color .15s,background .15s,transform .1s}.choice-btn:hover:not(:disabled){border-color:var(--accent);background:var(--accent-soft)}.choice-btn:active:not(:disabled){transform:scale(.98)}.choice-btn.correct{border-color:var(--success);background:var(--success-soft);color:var(--success)}.choice-btn.wrong{border-color:var(--danger);background:var(--danger-soft);color:var(--danger)}.choice-btn:disabled{cursor:default}.overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:50;display:flex;align-items:flex-end;justify-content:center;padding:.75rem;padding-bottom:max(.75rem,var(--safe-bottom));background:#0f172a73;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.overlay[hidden]{display:none!important}.card{width:min(100%,480px);background:var(--bg-elevated);border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);padding:1.1rem}.result-title{margin:0 0 .35rem;font-size:1.25rem}.result-verdict{margin:0 0 .85rem;font-size:1.1rem;font-weight:700}.result-verdict.is-correct{color:var(--success)}.result-verdict.is-wrong{color:var(--danger)}.result-stats{display:grid;grid-template-columns:1fr 1fr;gap:.75rem;margin-bottom:.75rem}.stat{background:var(--bg-muted);border-radius:12px;padding:.75rem;text-align:center}.stat-label{display:block;font-size:.75rem;color:var(--text-muted);margin-bottom:.25rem}.stat-value{font-size:1.2rem;font-weight:700}.stat-value.accent{color:var(--accent)}.result-place{margin:0 0 .75rem;color:var(--text-muted);font-size:.95rem;line-height:1.4}.result-thumb-wrap{height:120px;border-radius:12px;overflow:hidden;margin-bottom:.9rem;background:var(--bg-muted);border:1px solid var(--border)}.result-thumb{width:100%;height:100%;object-fit:cover;display:block}.screen-end{align-items:center;justify-content:center;padding:1.25rem;background:radial-gradient(ellipse at bottom,var(--accent-soft),transparent 50%),var(--bg)}.end-card{width:min(100%,440px);background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.35rem}.end-title{margin:0 0 .35rem;text-align:center;font-size:1.6rem}.end-total{margin:0 0 1rem;text-align:center;color:var(--text-muted);font-size:1.05rem}.end-total strong{color:var(--accent);font-size:1.5rem}.end-rounds{list-style:none;margin:0 0 1.25rem;padding:0;display:flex;flex-direction:column;gap:.5rem;max-height:45vh;overflow:auto}.end-rounds li{display:grid;grid-template-columns:auto 1fr auto;gap:.65rem;align-items:center;padding:.7rem .8rem;border-radius:12px;background:var(--bg-muted);font-size:.9rem}.end-round-num{font-weight:700;color:var(--accent);width:1.5rem}.end-round-place{color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.end-round-meta{color:var(--text-muted);font-variant-numeric:tabular-nums;white-space:nowrap}.end-round-meta.ok{color:var(--success);font-weight:700}.end-round-meta.bad{color:var(--danger);font-weight:700}@media(min-width:900px){.screen-play{flex-direction:row}.street-panel{flex:1 1 62%}.choice-sheet{flex:0 0 min(38%,420px);display:flex;flex-direction:column;justify-content:center;border-top:none;border-left:1px solid var(--border);padding:1.5rem}.choice-grid{grid-template-columns:1fr;gap:.85rem}.choice-btn{min-height:60px;font-size:1.15rem}.overlay{align-items:center}.result-thumb-wrap{height:160px}}