:root {color-scheme:light;--ink:#183348;--muted:#677889;--bg:#f4f7fb;--card:#fff;--line:#dce6ee;--teal:#0d817d;--teal-dark:#075955;--teal-soft:#e5f5f2;--indigo:#3956a8;--good:#147347;--good-bg:#e4f5e9;--bad:#ae3936;--bad-bg:#fff0ed;--radius:20px;--shadow:0 10px 30px rgba(28,64,87,.08)}
*{box-sizing:border-box}html{font-family:system-ui,-apple-system,'Noto Sans TC','Microsoft JhengHei',sans-serif}body{margin:0;background:radial-gradient(circle at 95% -10%,#ddf2f0 0%,transparent 28%),var(--bg);color:var(--ink);line-height:1.6}button,select{font:inherit}button{cursor:pointer}button:focus-visible,select:focus-visible{outline:3px solid #ecad44;outline-offset:3px}button:disabled{opacity:.5;cursor:not-allowed}main{width:min(920px,calc(100% - 28px));margin:0 auto 64px}.top{padding:36px 0 22px}.tag{display:inline-flex;align-items:center;gap:6px;font-size:13px;letter-spacing:.08em;color:var(--teal-dark);font-weight:800;text-transform:uppercase}.top h1{font-size:clamp(27px,5vw,43px);letter-spacing:-.025em;line-height:1.25;margin:9px 0 10px}.top p{color:var(--muted);margin:0;max-width:650px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:22px 0}.stat,.panel,.question-card,.finish-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.stat{padding:19px 20px}.stat-label{font-size:14px;color:var(--muted);font-weight:650}.stat-number{font-size:29px;font-weight:850;font-variant-numeric:tabular-nums;letter-spacing:-.03em}.stat-foot{font-size:12px;color:var(--muted)}.panel{padding:26px;margin:18px 0}.section-title{font-size:22px;font-weight:800;margin:0 0 7px}.section-subtitle{color:var(--muted);margin:0 0 20px}.formgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:flex;flex-direction:column;gap:7px}.field label{font-size:14px;font-weight:750}.field select{width:100%;background:white;border:1.5px solid #cbd8e3;border-radius:12px;padding:13px 13px;color:var(--ink);min-height:51px}.actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:22px}.btn{border:1.5px solid transparent;border-radius:13px;padding:12px 21px;min-height:49px;font-weight:800;display:inline-flex;align-items:center;justify-content:center;gap:7px;transition:transform .12s ease,background .12s ease}.btn:active:not(:disabled){transform:translateY(1px)}.btn-primary{background:var(--teal);color:white}.btn-primary:hover:not(:disabled){background:var(--teal-dark)}.btn-outline{border-color:#bcd3d1;background:white;color:var(--teal-dark)}.btn-outline:hover:not(:disabled){background:var(--teal-soft)}.btn-text{border-color:var(--line);background:#f8fafc;color:#546675}.info{background:#eef5fa;border:1px solid #d9e8f3;border-radius:13px;padding:13px 15px;font-size:14px;color:#466077}.small{font-size:13px;color:var(--muted)}.section-row{display:flex;align-items:center;justify-content:space-between;gap:10px}.pill{padding:4px 10px;border-radius:100px;background:var(--teal-soft);color:var(--teal-dark);font-size:13px;font-weight:800}.mistakes{padding:0;margin:15px 0 0;list-style:none;display:grid;gap:8px}.mistakes li{padding:10px 13px;border-radius:11px;background:#f6f9fb;border:1px solid #e7eff3;display:flex;justify-content:space-between;align-items:center;gap:8px}.mistakes .txt{font-weight:750}.mistakes .meta{font-size:12px;color:var(--muted)}.quiet{color:var(--muted);padding:8px 0}.quiz-header{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:12px 0}.progress-track{height:10px;background:#dfe9ef;border-radius:999px;overflow:hidden;margin:10px 0 21px}.progress-fill{height:100%;background:linear-gradient(90deg,var(--teal),#54b7a8);width:0%;transition:width .2s}.question-card{padding:clamp(20px,4vw,36px)}.q-meta{font-weight:750;color:var(--teal-dark);font-size:14px}.q-title{font-weight:820;font-size:clamp(21px,3.4vw,29px);line-height:1.55;margin:13px 0 25px;white-space:pre-wrap}.option-list{display:grid;gap:12px}.choice{width:100%;border:1.5px solid #d6e1e9;border-radius:14px;background:#fff;color:var(--ink);display:flex;align-items:flex-start;text-align:left;gap:14px;min-height:65px;padding:13px 17px;transition:border-color .12s,background .12s;font-size:17px;font-weight:650;line-height:1.65}.choice:hover:not(:disabled){border-color:var(--teal);background:#f4fcfa}.letter{flex:0 0 30px;height:30px;border-radius:9px;background:#eef4f8;color:#52697c;text-align:center;line-height:30px;font-weight:800;font-size:15px}.choice.correct{border-color:var(--good);background:var(--good-bg);color:#0b5634;opacity:1}.choice.correct .letter{background:var(--good);color:white}.choice.wrong{border-color:var(--bad);background:var(--bad-bg);color:#8c3430;opacity:1}.choice.wrong .letter{background:var(--bad);color:white}.choice.muted-choice{opacity:.52}.explain{margin-top:22px;padding:19px;border-radius:14px;border:1px solid #cfe7dd;background:#f0faf5}.explain.wrong-result{border-color:#efd2c7;background:#fff8f4}.explain-title{font-weight:850;margin:0 0 6px;color:var(--ink)}.explain p{margin:0}.nextbar{display:flex;justify-content:flex-end;margin-top:22px}.finish-card{padding:clamp(23px,4vw,36px);text-align:center}.finish-card h2{font-size:28px;margin:0}.finish-score{font-size:64px;line-height:1.1;color:var(--teal-dark);font-weight:880;letter-spacing:-.05em;margin:18px 0 3px}.review-list{text-align:left;margin:24px 0 0;padding:0;list-style:none;display:grid;gap:10px}.review-list li{border:1px solid var(--line);border-radius:13px;padding:15px;background:#f8fafb}.review-list strong{display:block}.review-list p{margin:4px 0 0;font-size:14px;color:#536576}.footer{border-top:1px solid #dce5eb;padding:16px 0;font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px}.hidden{display:none!important}.warn{font-size:14px;color:#985724;background:#fff5e6;padding:12px 15px;border-radius:12px;margin:15px 0 0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:600px){.top{padding:24px 0 12px}.grid{gap:8px}.stat{padding:12px 10px}.stat-label{font-size:12px}.stat-number{font-size:24px}.stat-foot{font-size:11px}.panel{padding:19px}.formgrid{grid-template-columns:1fr}.choice{font-size:16px;padding:13px}.actions .btn{width:100%}.nextbar .btn{width:100%}}

/* v1.1：僅在提交答案後顯示成語完整注音，避免預先洩題。 */
.idiom-answer{margin:10px 0 6px;font-size:18px;font-weight:700}.idiom-answer strong{color:#0d6964;font-weight:850}.zhuyin-answer{background:#fff;border:1px solid #d0e8df;border-radius:10px;padding:11px 12px;display:flex;gap:10px;flex-wrap:wrap;align-items:baseline;margin:8px 0 12px}.zhuyin-answer span{font-size:14px;font-weight:800;color:#496b6a;flex-shrink:0}.zhuyin-answer strong{font-family:system-ui,"Noto Sans TC",sans-serif;font-size:19px;letter-spacing:.045em;line-height:1.8;color:#163f46;overflow-wrap:anywhere}.reading-note{font-size:13px!important;color:#576977;margin:0 0 10px!important}.explanation-body{margin-top:9px!important}.review-list .review-zhuyin{color:#126d69;font-size:15px;font-weight:750;margin-top:8px;line-height:1.6}

/* v1.2：首頁顯示成語總數與最後更新日。 */
.bank-meta{display:flex;flex-wrap:wrap;gap:10px 22px;align-items:center;color:#4a6470;font-size:15px;font-weight:650;margin:5px 0 14px}
.bank-meta span{display:inline-flex;gap:4px;align-items:baseline}
.bank-meta strong{color:var(--teal-dark);font-size:18px;font-variant-numeric:tabular-nums}
.bank-meta time{color:var(--teal-dark);font-weight:800;font-variant-numeric:tabular-nums}