.btn{padding:12px 28px;border:none;border-radius:8px;font-size:1rem;font-weight:700;cursor:pointer;transition:background .15s,transform .1s;font-family:inherit}.btn:active{transform:scale(0.97)}.btn:disabled{background:#bbb;cursor:not-allowed}.btn-primary{background:#8b6914;color:#fff}.btn-primary:hover{background:#6d520f}.btn-primary:disabled{background:#d8cdb6;cursor:default}.btn-ghost{background:rgba(0,0,0,0);color:#8b6914;border:2px solid #8b6914}.btn-ghost:hover:not(:disabled){background:#f5e9c8}.btn-ghost:disabled{color:#c9bfae;border-color:#e0d8c8;cursor:default;background:rgba(0,0,0,0)}.btn-sm{padding:5px 12px;font-size:.8rem}.btn-danger{background:#b91c1c;color:#fff}.btn-danger:hover:not(:disabled){background:#991b1b}select,input[type=text],input[type=password],input[type=file]{padding:7px 10px;border:1px solid #ccc;border-radius:6px;font-size:.9rem;background:#fafaf8;outline:none;font-family:inherit;transition:border-color .2s}select:focus,input[type=text]:focus,input[type=password]:focus,input[type=file]:focus{border-color:#8b6914}.field{margin-bottom:20px}.field label{display:block;font-size:.85rem;font-weight:600;color:#555;margin-bottom:6px}.setup-field{display:flex;flex-direction:column;gap:6px}.setup-field label{font-size:.85rem;font-weight:600;color:#555}.filter-bar{background:#fff;border-radius:10px;box-shadow:0 1px 6px rgba(0,0,0,.07);padding:16px 20px;display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end;margin-bottom:20px}.filter-field{display:flex;flex-direction:column;gap:4px}.filter-field label{font-size:.78rem;font-weight:600;color:#666}@media(max-width: 768px){input[type=text]{width:100%}}.white-card,.setup-card{background:#fff;border-radius:14px;box-shadow:0 2px 16px rgba(0,0,0,.08);padding:28px 28px 24px}.setup-card{padding:32px;width:100%;display:flex;flex-direction:column;gap:20px}.setup-title{text-align:center}.setup-title h1{font-size:1.8rem;color:#5a3e1b;margin-bottom:6px}.setup-title p{color:#888;font-size:.95rem}#screen-setup{display:flex;flex-direction:column;align-items:center;gap:32px;padding-top:20px}.quiz-card{background:#fff;border-radius:14px;box-shadow:0 2px 16px rgba(0,0,0,.08);padding:28px 28px 24px}.quiz-meta{display:flex;gap:8px;margin-bottom:16px;align-items:center}.quiz-num{background:#5a3e1b;color:#fff;font-size:.8rem;font-weight:700;border-radius:5px;padding:3px 10px}.quiz-level{font-size:.78rem;color:#fff;background:#c9a84c;border-radius:5px;padding:3px 9px}.quiz-stem{font-size:1.05rem;line-height:1.8;color:#222;margin-bottom:24px;font-weight:500}.quiz-progress-bar{height:6px;background:#e8e0d0;border-radius:3px;overflow:hidden}.quiz-progress-fill{height:100%;background:#c9a84c;border-radius:3px;transition:width .4s}.quiz-footer{margin-top:20px;display:flex;justify-content:flex-end;gap:10px}.choices-list{display:flex;flex-direction:column;gap:10px}.choice-btn{display:flex;align-items:flex-start;gap:12px;width:100%;padding:14px 16px;background:#fafaf8;border:2px solid #e0d0b8;border-radius:10px;cursor:pointer;text-align:left;font-size:.95rem;line-height:1.5;font-family:inherit;color:#333;transition:border-color .15s,background .15s}.choice-btn:hover:not(:disabled){border-color:#c9a84c;background:#fdf8ed}.choice-btn:disabled{cursor:default}.choice-btn.selected{border-color:#2563eb;background:#eff6ff}.choice-btn.correct{border-color:#16a34a;background:#f0fdf4;color:#15803d;font-weight:600}.choice-btn.wrong{border-color:#dc2626;background:#fef2f2;color:#dc2626}.choice-btn.reveal{border-color:#16a34a;background:#f0fdf4;color:#15803d;font-weight:600}.choice-label{font-weight:800;flex-shrink:0;min-width:20px;color:#5a3e1b}.choice-btn.correct .choice-label,.choice-btn.reveal .choice-label{color:#16a34a}.choice-btn.wrong .choice-label{color:#dc2626}.choice-btn.selected .choice-label{color:#2563eb}.answer-feedback{margin-top:16px;padding:12px 16px;border-radius:8px;font-size:.9rem;font-weight:600;display:none}.answer-feedback.correct{background:#dcfce7;color:#15803d}.answer-feedback.wrong{background:#fee2e2;color:#b91c1c}.answer-feedback.no-answer{background:#fef3c7;color:#92400e}#screen-result{display:none}.result-hero{background:#fff;border-radius:14px;box-shadow:0 2px 16px rgba(0,0,0,.08);padding:36px;text-align:center;margin-bottom:24px}.result-score{font-size:3.5rem;font-weight:900;color:#5a3e1b;line-height:1;margin-bottom:8px}.result-score span{font-size:1.4rem;font-weight:600;color:#888}.result-label{font-size:1rem;color:#666;margin-bottom:20px}.result-rank{font-size:1.5rem;font-weight:700;padding:8px 24px;border-radius:99px;display:inline-block;margin-bottom:24px}.rank-s{background:#fef3c7;color:#b45309}.rank-a{background:#dcfce7;color:#15803d}.rank-b{background:#dbeafe;color:#1d4ed8}.rank-c{background:#f3f4f6;color:#374151}.rank-pass{background:#dcfce7;color:#15803d}.rank-fail{background:#fee2e2;color:#b91c1c}.result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.result-list{display:flex;flex-direction:column;gap:10px}.result-item{background:#fff;border-radius:10px;box-shadow:0 1px 6px rgba(0,0,0,.06);padding:16px 18px;border-left:4px solid #e0d0b8}.result-item.correct{border-left-color:#16a34a}.result-item.wrong{border-left-color:#dc2626}.result-item.skipped{border-left-color:#f59e0b}.result-item-header{display:flex;align-items:center;gap:10px;margin-bottom:8px}.result-icon{font-size:1.1rem}.result-item-num{font-size:.8rem;font-weight:700;color:#888}.result-item-stem{font-size:.9rem;font-weight:500;color:#333;flex:1}.result-answer-row{font-size:.82rem;color:#666;display:flex;gap:12px;flex-wrap:wrap}.result-answer-row .your{color:#dc2626}.result-answer-row .right{color:#16a34a;font-weight:600}.result-explanation{margin-top:8px;padding:8px 12px;background:#fdf8ed;border-left:3px solid #e0c97f;border-radius:0 6px 6px 0;font-size:.82rem;color:#666;line-height:1.6}.result-explanation-title{font-weight:700;color:#7c5c00;font-size:.78rem;margin-bottom:2px}.explanation-box{margin-top:12px;padding:12px 16px;background:#fdf8ed;border:1px solid #e0c97f;border-radius:8px;font-size:.88rem;line-height:1.7;color:#555;display:none}.explanation-box.visible{display:block}.explanation-box-title{font-size:.78rem;font-weight:700;color:#7c5c00;margin-bottom:4px}.explanation-box-text{white-space:pre-wrap}.no-explanation{font-size:.82rem;color:#bbb;margin-top:10px;display:none}.spinner{display:inline-block;width:28px;height:28px;border:3px solid #e8e0d0;border-top-color:#8b6914;border-radius:50%;animation:spin .7s linear infinite;margin-bottom:12px}@keyframes spin{to{transform:rotate(360deg)}}.state-msg{text-align:center;padding:60px 0;color:#aaa;font-size:.95rem}.loading-wrap{text-align:center;padding:60px 0}mark{background:#fff3b0;border-radius:2px}body{background:#f5f5f0}.page{max-width:720px;margin:0 auto;padding:36px 16px 60px}#screen-quiz{display:none}.quiz-header{margin-bottom:24px}.quiz-progress-label{display:flex;justify-content:space-between;font-size:.85rem;color:#888;margin-bottom:8px}.count-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:8px}.count-btn{padding:10px 0;border:2px solid #e0d0b8;border-radius:8px;background:#fafaf8;font-size:1rem;font-weight:700;color:#5a3e1b;cursor:pointer;transition:border-color .15s,background .15s;font-family:inherit}.count-btn.active{border-color:#8b6914;background:#fdf3de}select{padding:10px 12px;border:1px solid #ccc;border-radius:8px;font-size:.95rem;background:#fafaf8;outline:none;font-family:inherit}select:focus{border-color:#8b6914}