:root{--udt-primary:#f54900;--udt-primary-dark:#ca3500;--udt-exam:#155dfc;--udt-exam-dark:#1447e6;--udt-correct:#5ea500;--udt-correct-bg:#f7fee7;--udt-wrong:#e7000b;--udt-wrong-bg:#fef2f2;--udt-bg:#ffffff;--udt-surface:#f6f6f4;--udt-border:#e3e3df;--udt-text:#1f2937;--udt-muted:#6b7280;--udt-radius:12px}.udt-app{font-family:inherit;color:var(--udt-text);line-height:1.6}.udt-error,.udt-loading{text-align:center;padding:48px 16px;color:var(--udt-muted)}.udt-error{color:var(--udt-wrong)}.udt-title{font-size:22px;font-weight:600;margin:0 0 16px}.udt-select{width:100%;padding:12px 14px;font-size:16px;border:1px solid var(--udt-border);border-radius:var(--udt-radius);background:var(--udt-bg);margin-bottom:20px}.udt-mode-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px}@media (max-width:560px){.udt-mode-cards{grid-template-columns:1fr}}.udt-card{border-radius:var(--udt-radius);padding:20px;background:var(--udt-surface)}.udt-card h3{margin:0 0 8px;font-size:18px;line-height:10px}.udt-card p{margin:0 0 16px;color:var(--udt-muted);font-size:14px}.udt-card-exam{border:1px solid var(--udt-exam)}.udt-card-study{border:1px solid var(--udt-primary)}.udt-btn{display:inline-block;padding:11px 20px;font-size:15px;font-weight:500;border:none;border-radius:10px;cursor:pointer;transition:background .15s,opacity .15s}.udt-btn:disabled{cursor:default;opacity:.9}.udt-btn-primary{background:var(--udt-primary);color:#fff}.udt-btn-primary:hover{background:var(--udt-primary-dark)}.udt-btn-exam{background:var(--udt-exam);color:#fff}.udt-btn-exam:hover{background:var(--udt-exam-dark)}.udt-btn-ghost{background:0 0;color:var(--udt-muted);border:1px solid var(--udt-border)}.udt-btn-ghost:hover{background:var(--udt-surface)}.udt-btn-secondary{background:var(--udt-surface);color:var(--udt-text);border:1px solid var(--udt-border)}.udt-btn-secondary:hover{background:var(--udt-border)}.udt-btn-sm{padding:5px 10px;font-size:13px}.udt-quiz{padding:4px}.udt-qnum{font-size:14px;color:var(--udt-muted);margin-bottom:8px}.udt-qtext{font-size:19px;font-weight:500;line-height:1.4;margin:12px 0 20px}.udt-qimg{max-width:100%;border-radius:var(--udt-radius);margin-bottom:16px;cursor:zoom-in;display:block}.udt-answers{display:flex;flex-direction:column;gap:10px}.udt-answer{text-align:left;padding:14px 16px;font-size:16px;background:var(--udt-bg);border:1.5px solid var(--udt-border);border-radius:10px;cursor:pointer;transition:border-color .15s,background .15s}.udt-answer:hover:not(:disabled){border-color:var(--udt-primary)}.udt-answer.udt-selected{border-color:var(--udt-primary);background:#eff4ff}.udt-exam .udt-answer:hover:not(:disabled){border-color:var(--udt-exam)}.udt-exam .udt-answer.udt-selected{border-color:var(--udt-exam)}.udt-answer.udt-correct{border-color:var(--udt-correct);background:var(--udt-correct-bg)}.udt-answer.udt-wrong{border-color:var(--udt-wrong);background:var(--udt-wrong-bg)}.udt-answer:disabled{cursor:default}.udt-explanation{margin-top:14px;padding:0 14px;max-height:0;overflow:hidden;background:#fff8e6;border-radius:10px;font-size:14px;color:#5a4a1a;transition:max-height .2s,padding .2s}.udt-explanation.visible{max-height:400px;padding:14px}.udt-nav{display:flex;justify-content:space-between;gap:12px;margin-top:24px}.udt-nav-center{justify-content:center}.udt-progress{height:6px;background:var(--udt-border);border-radius:3px;overflow:hidden;margin-bottom:16px}.udt-progress-fill{height:100%;background:var(--udt-primary);transition:all .3s ease}.udt-progress-exam .udt-progress-fill{background:var(--udt-exam)}.udt-exam-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.udt-exam-top-right{display:flex;align-items:center;gap:8px}.udt-timer{font-variant-numeric:tabular-nums;font-weight:600;font-size:18px;padding:4px 12px;border-radius:8px;background:var(--udt-surface)}.udt-timer-low{color:var(--udt-wrong);background:var(--udt-wrong-bg)}.udt-qgrid{display:flex;flex-wrap:wrap;gap:6px;margin-top:20px;padding-top:16px}.udt-qdot{width:34px;height:34px;border:1px solid var(--udt-border);border-radius:8px;background:var(--udt-bg);font-size:13px;cursor:pointer;color:var(--udt-muted)}.udt-qdot.answered{background:#eff4ff;border-color:var(--udt-exam);color:var(--udt-exam)}.udt-qdot.current{box-shadow:0 0 0 2px var(--udt-exam);font-weight:600}.udt-result{text-align:center;padding:24px 8px}.udt-result-badge{display:inline-block;padding:6px 18px;border-radius:999px;font-weight:700;letter-spacing:.05em;font-size:14px;margin-bottom:12px}.udt-pass .udt-result-badge{background:var(--udt-correct-bg);color:var(--udt-correct)}.udt-fail .udt-result-badge{background:var(--udt-wrong-bg);color:var(--udt-wrong)}.udt-result-score{font-size:56px;font-weight:700;line-height:1}.udt-pass .udt-result-score{color:var(--udt-correct)}.udt-fail .udt-result-score{color:var(--udt-wrong)}.udt-result-detail{color:var(--udt-muted);margin:8px 0 24px}.udt-ring{display:none}.udt-review{margin-top:28px;text-align:left}.udt-review summary{cursor:pointer;font-weight:600;padding:10px 0;list-style:none;display:flex;align-items:center;gap:8px}.udt-review summary::target-text{outline:0}.udt-review summary::before{content:'▶';font-size:10px;transition:transform .2s}.udt-review[open] summary::before{transform:rotate(90deg)}.udt-review-item{border-radius:8px;margin-bottom:8px;overflow:hidden;border:1px solid var(--udt-border)}.udt-review-item.ok{border-color:var(--udt-correct)}.udt-review-item.bad{border-color:var(--udt-wrong)}.udt-review-hdr{display:flex;align-items:center;gap:10px;padding:8px 12px;font-size:13px}.udt-review-item.ok .udt-review-hdr{background:var(--udt-correct-bg)}.udt-review-item.bad .udt-review-hdr{background:var(--udt-wrong-bg)}.udt-review-num{font-weight:700;min-width:22px;height:22px;border-radius:50%;background:var(--udt-border);display:flex;align-items:center;justify-content:center;font-size:12px}.udt-review-item.ok .udt-review-num{background:var(--udt-correct);color:#fff}.udt-review-item.bad .udt-review-num{background:var(--udt-wrong);color:#fff}.udt-review-status{font-size:13px;font-weight:600}.udt-review-item.ok .udt-review-status{color:var(--udt-correct)}.udt-review-item.bad .udt-review-status{color:var(--udt-wrong)}.udt-review-q{padding:10px 12px 4px;font-size:14px;font-weight:600;line-height:1.5}.udt-review-answers{padding:4px 12px 8px;display:flex;flex-direction:column;gap:4px}.udt-review-answer{display:flex;align-items:flex-start;gap:8px;font-size:13px;color:var(--udt-muted);padding:2px 0}.udt-review-answer.correct{color:var(--udt-correct);font-weight:600}.udt-review-answer.wrong{color:var(--udt-wrong);font-weight:600}.udt-review-answer-icon{flex-shrink:0;font-size:14px;width:16px;text-align:center}.udt-review-answer-letter{flex-shrink:0;font-size:11px;font-weight:700;width:18px;color:var(--udt-muted)}.udt-review-expl{margin:0 12px 10px;padding:8px 10px;background:var(--udt-surface);border-radius:6px;font-size:13px;color:var(--udt-text);line-height:1.5}.udt-email-box{margin:20px 0 4px;padding:16px;background:var(--udt-surface);border-radius:10px;text-align:left}.udt-email-label{margin:0 0 4px;font-weight:600;font-size:14px}.udt-email-desc{margin:0 0 10px;font-size:13px;color:var(--udt-muted)}.udt-email-form{display:flex;gap:8px;flex-wrap:wrap}.udt-email-input{flex:1;min-width:200px;padding:9px 12px;border:1.5px solid var(--udt-border);border-radius:8px;font-size:14px;background:var(--udt-bg);color:var(--udt-text);outline:0;transition:border-color .2s}.udt-email-input:focus{border-color:var(--udt-primary)}.udt-email-send{white-space:nowrap}.udt-email-msg{margin-top:8px;font-size:13px;min-height:18px}.udt-email-ok{color:var(--udt-correct);font-weight:600}.udt-email-err{color:var(--udt-wrong)}.udt-email-pending-box{margin-top:10px;padding:14px 16px;border-radius:10px;background:var(--udt-surface,#f9fafb);border:1px solid var(--udt-border,#e5e7eb);text-align:center}.udt-email-pending-box.udt-email-ok{background:color-mix(in srgb,var(--udt-correct) 8%,transparent);border-color:color-mix(in srgb,var(--udt-correct) 30%,transparent)}.udt-email-countdown{font-size:36px;font-weight:700;letter-spacing:-1px;color:var(--udt-primary);line-height:1;margin-bottom:10px}.udt-email-pending-title{margin:0 0 4px;font-weight:600;font-size:14px;color:var(--udt-text)}.udt-email-pending-desc{margin:0 0 10px;font-size:13px;color:var(--udt-muted)}.udt-email-check{display:block;font-size:32px;line-height:1;margin-bottom:8px;color:var(--udt-correct)}.udt-email-retry{margin-top:8px}@keyframes udt-flash-wrong{0%{background:var(--udt-wrong-bg);border-color:var(--udt-wrong);transform:translateX(-4px)}25%{transform:translateX(4px)}50%{transform:translateX(-3px)}75%{transform:translateX(2px)}100%{background:var(--udt-bg);border-color:var(--udt-border);transform:translateX(0)}}.udt-answer.udt-flash-wrong{animation:udt-flash-wrong .45s ease-out forwards}.udt-answer-key{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;margin-right:10px;font-size:11px;font-weight:600;border:1px solid var(--udt-border);border-radius:5px;color:var(--udt-muted);flex-shrink:0;vertical-align:middle}.udt-answer.udt-correct .udt-answer-key,.udt-answer.udt-wrong .udt-answer-key,.udt-answer:hover .udt-answer-key{border-color:currentColor;opacity:.6}.udt-quiz:not(.udt-exam) .udt-answer-key--a{color:#2563eb;border-color:#93c5fd;background:#eff6ff}.udt-quiz:not(.udt-exam) .udt-answer-key--b{color:#ea580c;border-color:#fdba74;background:#fff7ed}.udt-quiz:not(.udt-exam) .udt-answer-key--c{color:#16a34a;border-color:#86efac;background:#f0fdf4}.udt-quiz:not(.udt-exam) .udt-answer-key--d{color:#7c3aed;border-color:#c4b5fd;background:#f5f3ff}.udt-quiz:not(.udt-exam) .udt-answer-key--e{color:#0891b2;border-color:#67e8f9;background:#ecfeff}.udt-quiz:not(.udt-exam) .udt-answer-key--f{color:#db2777;border-color:#f9a8d4;background:#fdf2f8}.udt-study-progress{display:flex;gap:1px;margin-bottom:12px;height:6px;border-radius:3px;overflow:hidden}.udt-study-dot{flex:1;height:100%;border-radius:0;background:var(--udt-border);transition:background .25s}@keyframes udt-dot-pulse{0%,100%{opacity:1}50%{opacity:.4}}.udt-study-dot.current{background:var(--udt-primary);animation:udt-dot-pulse 1.2s ease-in-out infinite}.udt-study-dot.correct{background:var(--udt-correct)}.udt-study-dot.wrong{background:var(--udt-wrong)}.udt-exam-intro-rules{background:var(--udt-surface);border-radius:var(--udt-radius);padding:4px 16px;margin:16px 0}.udt-exam-intro-row{display:flex;align-items:center;justify-content:space-between;padding:13px 0;border-bottom:1px solid var(--udt-border);font-size:15px}.udt-exam-intro-row:last-child{border-bottom:none}.udt-exam-intro-label{color:var(--udt-muted)}.udt-exam-intro-value{font-weight:600;color:var(--udt-text)}.udt-exam-intro-note{font-size:13px;color:var(--udt-muted);line-height:1.5;margin:0 0 24px}.udt-study-scope{display:flex;align-items:center;gap:8px;margin:-8px 0 16px;font-size:14px}.udt-study-scope-label{color:var(--udt-muted)}.udt-study-scope-value{font-weight:600;color:var(--udt-text)}.udt-config-row{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--udt-border)}.udt-config-indent{padding-left:28px;background:var(--udt-surface);padding-right:12px;border-radius:8px;border:none;margin-bottom:4px}.udt-toggle-label{display:flex;align-items:center;gap:10px;cursor:pointer;font-size:15px;flex:1;user-select:none}.udt-toggle-input{width:18px;height:18px;flex-shrink:0;cursor:pointer;accent-color:var(--udt-primary)}.udt-config-label{font-size:15px;flex:1}.udt-config-input{width:80px;padding:8px 10px;font-size:15px;border:1px solid var(--udt-border);border-radius:8px;text-align:center;background:var(--udt-bg)}.udt-config-col{flex-direction:column;align-items:stretch;gap:6px}.udt-slider-wrap{display:flex;align-items:center;gap:10px}.udt-slider{flex:1;height:4px;accent-color:var(--udt-primary);cursor:pointer;appearance:none;background:var(--udt-border);border-radius:2px;outline:0}.udt-slider::-webkit-slider-thumb{appearance:none;width:18px;height:18px;border-radius:50%;background:var(--udt-primary);cursor:pointer;box-shadow:0 1px 4px rgba(0,0,0,.2)}.udt-slider::-moz-range-thumb{width:18px;height:18px;border:none;border-radius:50%;background:var(--udt-primary);cursor:pointer}.udt-slider-value{min-width:28px;text-align:center;font-weight:700;font-size:15px;color:var(--udt-primary)}.udt-btn-all{padding:5px 11px;font-size:12px;font-weight:600;border:1.5px solid var(--udt-primary);border-radius:8px;color:var(--udt-primary);background:0 0;cursor:pointer;white-space:nowrap;transition:background .15s}.udt-btn-all:hover{background:#eff4ff}.udt-study-result{text-align:center;padding:32px 8px}.udt-study-result-icon{font-size:48px;margin-bottom:12px}.udt-study-result-score{font-size:20px;font-weight:600;margin:8px 0 4px}.udt-study-result-pct{font-size:48px;font-weight:700;color:var(--udt-primary);margin:8px 0 24px}.udt-nav-col{flex-direction:column;align-items:stretch;margin:24px auto 0}.udt-toast-container{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:9999;width:calc(100% - 32px);max-width:480px;display:flex;flex-direction:column;gap:8px;pointer-events:none}.udt-toast{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:10px;font-size:14px;font-weight:500;color:#fff;box-shadow:0 4px 20px rgba(0,0,0,.2);pointer-events:all;animation:udt-toast-in .25s ease forwards}.udt-toast>span{flex:1;line-height:1.4}.udt-toast-close{flex-shrink:0;background:0 0;border:none;color:inherit;cursor:pointer;font-size:20px;line-height:1;opacity:.7;padding:0 0 0 4px}.udt-toast-close:hover{opacity:1}.udt-toast-error{background:var(--udt-wrong)}.udt-toast-info{background:var(--udt-text)}.udt-toast-warning{background:#d97706}.udt-toast-success{background:var(--udt-correct)}@keyframes udt-toast-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.udt-confirm-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:9998;display:flex;align-items:flex-end;justify-content:center;padding:16px;animation:udt-overlay-in .2s ease}.udt-confirm-sheet{width:100%;max-width:440px;background:var(--udt-bg);border-radius:16px 16px 12px 12px;padding:24px 20px 20px;box-shadow:0 -2px 30px rgba(0,0,0,.12)}.udt-confirm-msg{margin:0 0 20px;font-size:16px;font-weight:600;line-height:1.4;color:var(--udt-text)}.udt-confirm-actions{display:flex;gap:10px}.udt-confirm-actions .udt-btn{flex:1;text-align:center}@keyframes udt-overlay-in{from{opacity:0}to{opacity:1}}@media (max-width:640px){.udt-answer{padding:16px 14px;font-size:15px;min-height:52px;display:flex;align-items:center}.udt-qtext{font-size:17px}.udt-answer{font-size:14px}.udt-qdot{width:30px;height:30px;font-size:11px;border-radius:6px}.udt-qgrid{gap:4px}.udt-study-config{max-width:100%}.udt-nav-col{max-width:100%}.udt-timer{font-size:15px;padding:3px 8px}.udt-mode-cards{grid-template-columns:1fr}.udt-slider-wrap{flex-wrap:nowrap}.udt-app{padding:0 12px}.udt-answer-key{display:none}}