:root{--bg: #f4f7fb;--panel: #ffffff;--border: #e3e9f2;--text: #1f2a3a;--muted: #6b7888;--primary: #2f6df0;--primary-soft: #e8f0ff;--primary-dark: #1d4fc4;--correct: #1f9d5b;--correct-soft: #e6f7ee;--wrong: #e0563f;--wrong-soft: #fdecea;--warn: #e8a33d;--shadow: 0 6px 22px rgba(31, 42, 58, .08);--radius: 14px}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased}#app{max-width:940px;margin:0 auto;padding:0 16px 60px}button{font-family:inherit;cursor:pointer;border:none;outline:none}.btn{background:var(--primary);color:#fff;padding:11px 20px;border-radius:10px;font-size:15px;font-weight:600;transition:background .15s,transform .05s}.btn:hover{background:var(--primary-dark)}.btn:active{transform:translateY(1px)}.btn.secondary{background:#fff;color:var(--primary);border:1.5px solid var(--border)}.btn.secondary:hover{background:var(--primary-soft)}.btn.ghost{background:transparent;color:var(--muted);border:1.5px solid var(--border)}.btn:disabled{opacity:.5;cursor:not-allowed}.topbar{position:sticky;top:0;z-index:20;background:#f4f7fbeb;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:space-between;padding:14px 4px 12px;margin-bottom:8px;border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:10px}.brand .logo{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--primary),#5b8df6);color:#fff;font-weight:800;display:grid;place-items:center;font-size:18px;box-shadow:var(--shadow)}.brand h1{font-size:17px;margin:0;line-height:1.2}.brand p{margin:0;font-size:12px;color:var(--muted)}.tabs{display:flex;gap:6px;flex-wrap:wrap}.tab{padding:8px 14px;border-radius:9px;font-size:14px;font-weight:600;color:var(--muted);background:transparent;border:1.5px solid transparent;transition:all .15s}.tab:hover{color:var(--primary)}.tab.active{color:var(--primary);background:var(--primary-soft);border-color:#cfe0ff}.tab .badge{display:inline-block;min-width:18px;margin-left:6px;padding:0 5px;font-size:11px;line-height:18px;border-radius:9px;background:var(--wrong);color:#fff;text-align:center}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.section-title{font-size:15px;font-weight:700;margin:0 0 12px}.field{margin-bottom:18px}.field>label{display:block;font-size:13px;color:var(--muted);margin-bottom:8px}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{padding:9px 14px;border-radius:10px;font-size:14px;font-weight:600;background:#fff;border:1.5px solid var(--border);color:var(--text);transition:all .12s}.chip:hover{border-color:#b9cdf3}.chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}.chip .cnt{font-size:12px;opacity:.8;margin-left:4px}.start-row{display:flex;gap:12px;align-items:center;margin-top:6px;flex-wrap:wrap}.stat-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.stat{flex:1;min-width:120px;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:14px 16px;box-shadow:var(--shadow)}.stat .n{font-size:24px;font-weight:800;color:var(--primary)}.stat .l{font-size:12px;color:var(--muted);margin-top:2px}.progress-wrap{margin-bottom:14px}.progress-meta{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:6px}.progress-bar{height:8px;border-radius:6px;background:#e9eef6;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),#5b8df6);transition:width .25s}.q-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}.q-type{font-size:12px;font-weight:700;padding:3px 10px;border-radius:20px;background:var(--primary-soft);color:var(--primary-dark)}.q-sub{font-size:12px;color:var(--muted)}.q-text{font-size:17px;font-weight:600;line-height:1.55;margin:6px 0 18px}.options{display:flex;flex-direction:column;gap:10px}.option{display:flex;align-items:center;gap:12px;padding:13px 15px;border:1.5px solid var(--border);border-radius:11px;background:#fff;font-size:15px;transition:all .12s;text-align:left;width:100%}.option:hover{border-color:#b9cdf3;background:#fafcff}.option .label{flex:0 0 26px;height:26px;border-radius:7px;display:grid;place-items:center;background:#eef2f8;color:var(--muted);font-weight:700;font-size:14px}.option.selected{border-color:var(--primary);background:var(--primary-soft)}.option.selected .label{background:var(--primary);color:#fff}.option.correct{border-color:var(--correct);background:var(--correct-soft)}.option.correct .label{background:var(--correct);color:#fff}.option.wrong{border-color:var(--wrong);background:var(--wrong-soft)}.option.wrong .label{background:var(--wrong);color:#fff}.option.dim{opacity:.55}.feedback{margin-top:16px;border-radius:12px;padding:14px 16px;font-size:14px}.feedback.ok{background:var(--correct-soft);color:#157a45;border:1px solid #bfe9cf}.feedback.no{background:var(--wrong-soft);color:#b23a23;border:1px solid #f6c9bf}.feedback .explain-title{font-weight:700;margin-bottom:4px}.feedback .explain{line-height:1.6;color:#8a3b27}.feedback.ok .explain{color:#1d7a47}.auto-next{margin-top:14px;display:flex;align-items:center;gap:10px;background:var(--correct-soft);border:1px solid #bfe9cf;color:#157a45;border-radius:11px;padding:11px 15px;font-weight:600;font-size:14px}.spinner{width:16px;height:16px;border:2.5px solid #bfe9cf;border-top-color:var(--correct);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.actions{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap;align-items:center}.icon-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 14px;border-radius:10px;border:1.5px solid var(--border);background:#fff;font-size:14px;font-weight:600;color:var(--muted);transition:all .12s}.icon-btn:hover{border-color:#b9cdf3;color:var(--primary)}.icon-btn.on{color:var(--warn);border-color:#f0d29b;background:#fff7e9}.icon-btn.danger{color:var(--wrong);border-color:#f0c3b8}.list-item{display:flex;align-items:center;gap:12px;padding:14px 16px;border:1px solid var(--border);border-radius:12px;background:#fff;margin-bottom:10px;box-shadow:var(--shadow)}.list-item .body{flex:1;min-width:0}.list-item .q{font-size:15px;font-weight:600;line-height:1.5;margin-bottom:4px}.list-item .meta{font-size:12px;color:var(--muted)}.tag{display:inline-block;font-size:11px;padding:2px 8px;border-radius:20px;background:var(--primary-soft);color:var(--primary-dark);margin-right:6px}.tag.wrong{background:var(--wrong-soft);color:var(--wrong)}.empty{text-align:center;color:var(--muted);padding:50px 20px;font-size:15px}.result{text-align:center;padding:16px 8px}.result .score{font-size:46px;font-weight:800;color:var(--primary)}.result .sub{color:var(--muted);margin:6px 0 18px}.result .breakdown{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:18px}.result .b{background:#fff;border:1px solid var(--border);border-radius:12px;padding:12px 18px;min-width:90px}.result .b .n{font-size:22px;font-weight:800}.result .b .l{font-size:12px;color:var(--muted)}.foot{text-align:center;color:var(--muted);font-size:12px;margin-top:26px;line-height:1.6}@media (max-width: 560px){.topbar{flex-direction:column;align-items:stretch;gap:10px}.tabs{justify-content:space-between}.q-text{font-size:16px}}