:root{--primary: #2563eb;--bg: #f8fafc;--border: #e2e8f0;--text: #0f172a;--muted: #64748b;--warn: #d97706}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{margin:0;font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:16px;padding-bottom:env(safe-area-inset-bottom)}.page{padding:16px}.page h1{font-size:18px;margin:0 0 12px}.todo{display:inline-block;padding:3px 8px;background:#fef3c7;border:1px solid #fde68a;border-radius:999px;font-size:12px;color:var(--warn)}.hint{color:var(--muted);font-size:13px;line-height:1.8}button,.btn{min-height:44px}.level-mastered{color:#16a34a}.level-consolidating{color:#2563eb}.level-weak{color:#dc2626;font-weight:600}.level-untested{color:#94a3b8}:root{--ok: #16a34a;--danger: #dc2626;--primary-light: #dbeafe}.top-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.top-bar h1{margin:0}.top-bar-title{flex:1;font-size:16px;margin:0 8px!important;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tabs{display:flex;margin-bottom:12px}.tab{flex:1;text-align:center;padding:10px 0;font-size:14px;color:var(--muted);border-bottom:2px solid var(--border);-webkit-tap-highlight-color:transparent}.tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}.card{background:#fff;border:1px solid var(--border);border-radius:12px;padding:12px;margin-bottom:12px}.card-title-row{display:flex;align-items:center}.card-title{flex:1;font-size:16px;font-weight:600;line-height:1.5}.meta{color:var(--muted);font-size:13px;line-height:1.8;margin:4px 0}.stem{font-size:16px;line-height:1.8;white-space:pre-wrap;margin:8px 0}.stem-img{max-width:100%;border-radius:8px;display:block;margin-bottom:8px}.explanation{background:#f1f5f9;border-radius:8px;padding:8px;font-size:14px;line-height:1.8;color:var(--text);margin:8px 0 0}.badge-row{display:flex;align-items:center;margin:4px 0}.badge-row .meta{flex:1;margin:0}.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;line-height:1.8;background:#f1f5f9;color:var(--muted)}.badge-ai{background:#ede9fe;color:#7c3aed;margin-left:8px}.badge-state-not_started{background:#f1f5f9;color:var(--muted)}.badge-state-in_progress{background:var(--primary-light);color:var(--primary)}.badge-state-completed{background:#dcfce7;color:var(--ok)}.badge-state-closed{background:#fee2e2;color:var(--danger)}.badge-ok{background:#dcfce7;color:var(--ok)}.badge-bad{background:#fee2e2;color:var(--danger)}.error-banner{background:#fee2e2;border:1px solid #fecaca;color:var(--danger);border-radius:8px;padding:10px 12px;font-size:14px;line-height:1.6;margin-bottom:12px}.btn{display:inline-block;border-radius:10px;border:1px solid var(--border);background:#fff;color:var(--text);font-size:16px;padding:10px 16px;margin:4px 4px 4px 0;text-align:center;cursor:pointer}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}.btn-ghost{background:#fff;color:var(--text)}.btn-block{display:block;width:100%;margin:6px 0}.btn-sm{min-height:36px;padding:4px 12px;font-size:14px}.btn:disabled{opacity:.5}.btn-row{display:flex;margin-top:6px}.btn-row .btn{flex:1;margin:4px 2px 0}.field{display:block;margin-bottom:12px}.field span{display:block;font-size:14px;color:var(--muted);margin-bottom:6px}.field input{width:100%;min-height:44px;padding:10px 12px;font-size:16px;border:1px solid var(--border);border-radius:10px;background:#fff;color:var(--text)}.option-list{margin-top:8px}.option{display:flex;align-items:center;width:100%;min-height:48px;text-align:left;background:#fff;border:1px solid var(--border);border-radius:10px;padding:10px 12px;margin-bottom:8px;font-size:16px;color:var(--text);line-height:1.6}.option.selected{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}.mark{font-size:16px;margin-right:8px}.option-key{margin-right:6px;font-weight:600}.option-text{flex:1}.q-nav{display:flex;flex-wrap:wrap;margin-top:6px}.q-nav-item{width:44px;height:44px;min-height:44px;margin:4px;border:1px solid var(--border);border-radius:8px;background:#fff;font-size:15px;color:var(--text)}.q-nav-item.answered{background:var(--primary-light);border-color:var(--primary);color:var(--primary)}.q-nav-item.current{border-color:var(--warn);border-width:2px;font-weight:700}.footer-bar{display:flex;position:sticky;bottom:0;left:0;right:0;background:var(--bg);padding:8px 0;padding-bottom:calc(8px + env(safe-area-inset-bottom))}.footer-bar .btn{flex:1;margin:0 4px}.submit-card{margin-top:12px}.save-state{font-size:12px}.save-saved{color:var(--ok)}.save-saving{color:var(--muted)}.save-error{color:var(--danger)}.countdown{font-weight:600}.countdown.expired{color:var(--danger)}.score-big{font-size:40px;font-weight:700;margin:8px 0;color:var(--primary)}.score-sub{font-size:16px;color:var(--muted);font-weight:400}.score-updated{background:#fef3c7;border:1px solid #fde68a;border-radius:8px;padding:8px 10px;font-size:14px;font-weight:600;color:var(--warn);margin:6px 0}.score-inline{font-size:18px;color:var(--primary)}.cmp-bar{position:relative;height:12px;background:#f1f5f9;border:1px solid var(--border);border-radius:999px;margin:8px 0 2px}.cmp-fill{height:100%;background:var(--primary);border-radius:999px}.cmp-avg{position:absolute;top:-2px;width:2px;height:14px;background:var(--warn)}.cmp-legend{color:var(--muted);font-size:12px}.trend-wrap{margin:4px 0 12px}.trend-chart{width:100%;height:auto;display:block;background:#fff;border:1px solid var(--border);border-radius:12px}.trend-grid{stroke:var(--border);stroke-width:1;stroke-dasharray:4 4}.trend-axis-text{font-size:10px;fill:var(--muted)}.trend-line{fill:none;stroke:var(--primary);stroke-width:2;stroke-linejoin:round;stroke-linecap:round}.trend-dot{fill:var(--primary)}.level-legend{margin-bottom:8px}.level-legend-item{margin:4px 0}.level-legend-item .badge{min-width:60px;text-align:center}.level-group-title{font-size:15px;margin:16px 0 8px}.practice-tip{background:var(--primary-light);border-color:#bfdbfe}.chip-row{margin:6px 0}.chip{display:inline-block;padding:2px 10px;margin:2px 6px 2px 0;border:1px solid var(--border);border-radius:999px;font-size:12px;line-height:1.8;color:var(--muted);background:#fff}