:root{--bg: #0b1020;--bg-soft: #101830;--card: #131c38;--card-2: #182344;--border: #26325e;--text: #e9edfa;--text-2: #aab6dd;--muted: #7f8dbd;--accent: #ffd977;--accent-2: #c9a34d;--ok: #7fd08a;--bad: #e08a8a;--radius: 16px;--font-size: 19px}*{box-sizing:border-box;margin:0;padding:0}html{font-size:var(--font-size)}body{background:var(--bg);color:var(--text);font-family:Noto Sans TC,PingFang TC,Microsoft JhengHei,system-ui,sans-serif;line-height:1.6;min-height:100vh}#app{min-height:100vh}.boot{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.6rem;background:radial-gradient(1200px 500px at 50% -10%,#182450 0%,transparent 60%),var(--bg)}.boot-title{font-size:2.6rem;font-weight:800;letter-spacing:.12em;color:var(--accent)}.boot-sub{color:var(--muted);letter-spacing:.2em;font-size:.95rem}.screen{max-width:820px;margin:0 auto;padding:1.4rem 1.1rem 4rem}.topbar{display:flex;align-items:center;justify-content:space-between;gap:.8rem;padding:.6rem 0 1.2rem}.topbar .brand{font-weight:800;color:var(--accent);letter-spacing:.08em}.topbar .brand small{color:var(--muted);font-weight:400;margin-left:.4rem}.topbar .meta{color:var(--text-2);font-size:.95rem}.card{background:linear-gradient(180deg,var(--card-2),var(--card));border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem 1.4rem;margin-bottom:1.1rem}.region-head{margin-bottom:1rem}.region-head h2{font-size:1.5rem;color:var(--accent)}.region-head .en{color:var(--muted);letter-spacing:.18em;font-size:.85rem}.region-head p{margin-top:.4rem;color:var(--text-2)}.case-row{display:flex;align-items:center;gap:.9rem;padding:.95rem 1rem;border:1px solid var(--border);border-radius:12px;background:var(--card);margin-bottom:.7rem;cursor:pointer;transition:transform .08s ease,border-color .08s ease;width:100%;text-align:left;color:var(--text);font-size:1rem}.case-row:hover:not(.locked){border-color:var(--accent-2);transform:translate(2px)}.case-row.locked{opacity:.55;cursor:not-allowed}.case-row .num{flex:0 0 2.2rem;height:2.2rem;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;background:var(--bg-soft);border:1px solid var(--border);color:var(--text-2)}.case-row.completed .num{background:var(--ok);color:#06230e;border-color:var(--ok)}.case-row .body{flex:1}.case-row .body .t{font-weight:700}.case-row .body .s{font-size:.9rem;color:var(--muted)}.case-row .grade-badge{font-weight:800;color:var(--accent);border:1px solid var(--accent-2);border-radius:8px;padding:.1rem .55rem;font-size:.9rem}.case-row .lock-ic{color:var(--muted);font-size:1.1rem}.steps{display:flex;gap:.4rem;margin-bottom:1rem;flex-wrap:wrap}.step{flex:1;min-width:4.5rem;text-align:center;padding:.35rem .3rem;border-radius:10px;font-size:.85rem;color:var(--muted);background:var(--bg-soft);border:1px solid var(--border)}.step.active{color:var(--accent);border-color:var(--accent-2);background:#1a2140;font-weight:700}.step.done{color:var(--ok);border-color:var(--ok)}.brief{white-space:pre-line;color:var(--text)}.brief .hl{color:var(--accent)}.label{display:inline-block;font-size:.82rem;letter-spacing:.12em;color:var(--accent-2);border:1px solid var(--accent-2);border-radius:999px;padding:.05rem .7rem;margin-bottom:.7rem}.teach{color:var(--text-2);white-space:pre-line}.question{font-size:1.15rem;font-weight:700;margin-bottom:1rem;color:var(--text)}.option{display:block;width:100%;text-align:left;padding:.9rem 1rem;margin-bottom:.65rem;border:1px solid var(--border);border-radius:12px;background:var(--card-2);color:var(--text);font-size:1rem;cursor:pointer;transition:border-color .08s ease,background .08s ease}.option:hover{border-color:var(--accent-2)}.option.selected,.option.pick{border-color:var(--accent);background:#202a4e}.option.reveal-correct{border-color:var(--ok);background:#14301c}.option.reveal-wrong{border-color:var(--bad);background:#331a1a}.opt-multi .option:before{content:"☐";margin-right:.55rem;color:var(--muted)}.opt-multi .option.selected:before{content:"☑";color:var(--accent)}.hotspot-wrap{margin-bottom:.9rem}.hotspot-wrap svg{border-radius:12px}.hotspot-wrap .cap{font-size:.85rem;color:var(--muted);margin-top:.35rem;text-align:center}.hotspot-svg{cursor:crosshair;outline:none}.hotspot-svg circle{transition:fill .08s ease,stroke .08s ease}.hotspot-svg:hover circle{fill:#ffd97766;stroke-width:3.5}.hotspot-svg:focus-visible circle{stroke:#fff;stroke-width:3.5}.hotspot-svg.picked circle{fill:#ffd97799}.hotspot-svg.reveal-correct circle{stroke:var(--ok);fill:#7fd08a80}.hotspot-svg.reveal-wrong circle{stroke:var(--bad);fill:#e08a8a80}.hotspot-svg.reveal-correct text{fill:var(--ok)}.hotspot-svg.reveal-wrong text{fill:var(--bad)}.opt-sort .sort-item{display:flex;align-items:center;gap:.8rem}.opt-sort .sort-num{flex:0 0 1.9rem;height:1.9rem;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-weight:800;border:1.5px solid var(--border);color:var(--muted);background:var(--bg-soft)}.opt-sort .sort-item.selected .sort-num{border-color:var(--accent);color:var(--accent);background:#202a4e}.sort-hint{font-size:.88rem;color:var(--muted);margin:-.2rem 0 .8rem}.btn{display:inline-block;border:1px solid var(--accent-2);background:transparent;color:var(--accent);font-size:1.05rem;font-weight:700;padding:.7rem 1.6rem;border-radius:12px;cursor:pointer;transition:background .08s ease,color .08s ease;margin-top:.4rem}.btn:hover{background:var(--accent);color:#241a02}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.ghost{border-color:var(--border);color:var(--text-2)}.btn.ghost:hover{background:var(--card-2);color:var(--text)}.btn-row{display:flex;gap:.7rem;flex-wrap:wrap;margin-top:.6rem}.fb{margin-top:1rem;border-left:4px solid var(--accent-2);background:var(--bg-soft);padding:.9rem 1rem;border-radius:0 12px 12px 0}.fb.ok{border-color:var(--ok)}.fb.bad{border-color:var(--bad)}.fb .head{font-weight:700;margin-bottom:.3rem}.fb.ok .head{color:var(--ok)}.fb.bad .head{color:var(--bad)}.fb .explain{color:var(--text-2)}.fb+.fb{margin-top:.6rem}.result-score{font-size:2.4rem;font-weight:800;color:var(--accent);text-align:center}.result-grade{text-align:center;font-size:1.3rem;margin-bottom:.8rem}.result-sub{text-align:center;color:var(--muted);margin-bottom:1.2rem}.lesson{white-space:pre-line;color:var(--text-2);margin-top:.4rem}.src-list{margin-top:1rem}.src-list .src-item{font-size:.92rem;color:var(--text-2);margin-bottom:.5rem}.src-list a{color:var(--accent);word-break:break-all}.region-done{text-align:center;padding:2.5rem 1rem}.region-done .seal{font-size:3.2rem;margin-bottom:.8rem}.region-done h2{color:var(--accent);margin-bottom:.6rem}.region-done p{color:var(--text-2);margin-bottom:1.4rem}@media(max-width:480px){.screen{padding:1rem .7rem 3rem}.case-row{padding:.8rem}.boot-title{font-size:2rem}.option{padding:.8rem}.topbar{flex-direction:column;align-items:flex-start;gap:.2rem}}