:root{--bg:#f5f7fb;--card:#fff;--primary:#5b8def;--primary-d:#3f6fd1;--text:#1f2937;--muted:#6b7280;--c1:#5b8def;--c2:#a78bfa;--c3:#34d399;--c4:#fbbf24;--c5:#f472b6}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif}.app{flex-direction:column;max-width:480px;min-height:100vh;margin:0 auto;display:flex}.screen{flex:1;padding:18px 16px 30px;display:none}.screen.active{flex-direction:column;display:flex}.header{color:#fff;background:linear-gradient(135deg,#5b8def,#a78bfa);border-radius:0 0 22px 22px;padding:24px 18px 20px}.header h1{margin:0 0 6px;font-size:21px}.header p{opacity:.92;margin:0;font-size:13px;line-height:1.5}.card{background:var(--card);border-radius:16px;padding:18px;box-shadow:0 4px 16px #0000000d}.disclaimer{color:var(--muted);background:#fff8ec;border:1px solid #fde9c8;border-radius:12px;margin-top:14px;padding:12px;font-size:12px;line-height:1.7}.btn{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:14px;width:100%;margin-top:14px;padding:15px;font-size:17px;font-weight:600;display:block}.btn:active{background:var(--primary-d)}.btn.ghost{color:var(--text);background:#eef2f7}.btn:disabled{color:#fff;background:#cbd5e1}.loading{text-align:center;color:var(--muted);padding:40px}.quiz-question{flex-direction:column;gap:14px;display:flex}.quiz-instruction{color:var(--text);padding:12px 0;font-size:16px;font-weight:600;line-height:1.5}.stimulus-area{text-align:center;background:#fff;border-radius:14px;flex-direction:column;justify-content:center;align-items:center;gap:10px;min-height:60px;padding:20px;display:flex}.stimulus-text{color:var(--primary);font-size:22px;font-weight:700}.stimulus-grid{flex-direction:column;align-items:center;gap:6px;display:flex}.grid-row{gap:6px;display:flex}.grid-cell{background:#f9fafb;border:1px solid #e5e7eb;border-radius:8px;justify-content:center;align-items:center;width:42px;height:42px;font-size:22px;display:inline-flex}.grid-cell.cell-blank{border:2px dashed var(--primary);color:var(--primary);background:#eef4ff}.matrix-grid .grid-cell{width:52px;height:52px;font-size:24px}.stimulus-sequence{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.seq-symbol{justify-content:center;align-items:center;min-width:36px;height:36px;padding:0 6px;font-size:20px;font-weight:600;display:inline-flex}.seq-symbol.cell-blank{border:2px dashed var(--primary);color:var(--primary);background:#eef4ff;border-radius:8px}.memory-seq .seq-symbol{font-size:28px;font-weight:800}.stimulus-target{color:var(--text);font-size:16px}.target-symbol{color:var(--primary);padding:0 6px;font-size:26px;font-weight:700}.stimulus-mapping{flex-direction:column;align-items:center;gap:8px;display:flex}.mapping-title{color:var(--muted);font-size:13px}.mapping-grid{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.stimulus-single-symbol{color:var(--primary);font-size:56px;font-weight:800;line-height:1}.seq-symbol.lg{min-width:42px;height:42px;font-size:26px}.seq-symbol.sm{min-width:24px;height:28px;padding:0 2px;font-size:18px}.arrow-cell{color:var(--primary);font-size:28px}.analogy-eq{color:var(--muted);align-items:center;padding:0 4px;font-size:24px;font-weight:700;display:inline-flex}.analogy-seq{align-items:center}.seq-group{background:#f9fafb;border:1px solid #e5e7eb;border-radius:8px;gap:4px;margin:0 10px;padding:6px 10px;display:inline-flex}.classification-seq{gap:12px}.memory-word{color:var(--primary);background:#eef4ff;border-radius:8px;align-items:center;padding:4px 10px;font-size:20px;font-weight:700;display:inline-flex}.word-seq{gap:10px}.dense-seq{gap:4px;max-width:100%;line-height:1.6}.mapping-pair{background:#f3f4f6;border-radius:8px;align-items:center;gap:6px;padding:6px 12px;font-size:18px;display:inline-flex}.map-key{font-weight:700}.map-arrow{color:var(--muted)}.map-val{font-weight:600}.quiz-options{flex-direction:column;gap:8px;display:flex}.quiz-option{cursor:pointer;text-align:left;background:#fff;border:2px solid #e5e7eb;border-radius:12px;align-items:center;gap:10px;padding:14px 16px;font-size:16px;transition:all .15s;display:flex}.quiz-option:active{border-color:var(--primary)}.quiz-option.selected{border-color:var(--primary);background:#eef4ff}.quiz-option.correct{background:#f0fdf4;border-color:#22c55e}.quiz-option.wrong{background:#fef2f2;border-color:#ef4444}.quiz-option:disabled{cursor:default}.opt-letter{width:28px;height:28px;color:var(--muted);background:#f3f4f6;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:13px;font-weight:700;display:inline-flex}.dim-banner{background:var(--primary);color:#fff;padding:18px}.dim-banner-title{font-size:17px;font-weight:700;line-height:1.5}.dim-desc{color:var(--text);margin:0 0 8px;font-size:15px;line-height:1.7}.dim-range{color:var(--muted);margin:0 0 18px;font-size:13px}.dim-intro{color:var(--text);margin:0 0 12px;font-size:14px;font-weight:600}.dim-example{background:#f8fafc;border:1.5px dashed #c7d2fe;margin-top:4px;padding:20px 16px;position:relative}.dim-example-badge{color:#4338ca;background:#e0e7ff;border-radius:20px;padding:3px 10px;font-size:12px;font-weight:700;position:absolute;top:-10px;left:16px}.dim-example-emoji{text-align:center;margin:8px 0 10px;font-size:64px;line-height:1}.dim-example-shape{text-align:center;color:var(--primary);margin:8px 0 10px;font-size:36px;font-weight:800}.dim-example-prompt{text-align:center;letter-spacing:6px;color:var(--primary);margin:8px 0 10px;font-size:32px;font-weight:700}.dim-example-title{text-align:center;margin-bottom:16px;font-size:15px;font-weight:600}.dim-example-options{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.dim-example-option{cursor:pointer;background:#fff;border:2px solid #e5e7eb;border-radius:12px;min-width:62px;padding:12px 14px;font-size:18px;font-weight:600;position:relative}.dim-example-option.disabled{cursor:default}.dim-example-option.correct{background:#f0fdf4;border-color:#22c55e}.dim-example-option.wrong{background:#fef2f2;border-color:#ef4444}.dim-example-check{color:#fff;background:#22c55e;border-radius:50%;justify-content:center;align-items:center;width:20px;height:20px;font-size:12px;display:inline-flex;position:absolute;top:-6px;right:-6px}.dim-example-tip{color:var(--muted);text-align:center;margin:14px 0 0;font-size:13px}.quiz-option.selected .opt-letter,.quiz-option.correct .opt-letter{background:var(--primary);color:#fff}.quiz-option.wrong .opt-letter{color:#fff;background:#ef4444}.opt-text{align-items:center;display:inline-flex}.opt-symbol{margin-right:4px;display:inline-block}.quiz-header-bar{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.quiz-progress{color:var(--muted);font-size:13px}.quiz-timer{color:var(--primary);background:#eef4ff;border-radius:8px;padding:4px 12px;font-size:14px;font-weight:600}.quiz-timer.danger{color:#ef4444;background:#fef2f2}.quiz-timer.warn{color:#f59e0b;background:#fffbeb}.quiz-total-bar{color:var(--muted);background:#fff;border-radius:8px;justify-content:space-between;align-items:center;margin-bottom:10px;padding:8px 12px;font-size:13px;display:flex}.quiz-total-bar span:last-child{color:var(--primary);font-weight:600}.quiz-total-bar span.danger{color:#ef4444}