:root{--color-bg:#fafaf7;--color-surface:#fff;--color-primary:#2d5a3d;--color-primary-light:#e8f0ea;--color-accent:#c4956a;--color-text:#1a1a1a;--color-text-secondary:#5a5a5a;--color-border:#e0e0dc;--color-success:#3d7a4d;--color-warning:#b8860b;--color-danger:#a04040;--radius:12px;--radius-sm:8px;--shadow:0 2px 8px #0000000f;--shadow-lg:0 4px 16px #0000001a;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);font-size:16px;line-height:1.6}#root{min-height:100vh}.app-container{max-width:900px;min-height:100vh;margin:0 auto;padding:16px}.top-nav{border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;margin-bottom:24px;padding:12px 0;display:flex}.top-nav h1{color:var(--color-primary);font-size:20px;font-weight:600}.nav-links{flex-wrap:wrap;gap:16px;display:flex}.nav-links a{color:var(--color-text-secondary);border-radius:var(--radius-sm);padding:6px 12px;font-size:14px;text-decoration:none;transition:all .2s}.nav-links a:hover,.nav-links a.active{color:var(--color-primary);background:var(--color-primary-light)}.view-toggle{background:var(--color-border);border-radius:var(--radius-sm);gap:4px;padding:2px;display:flex}.view-toggle button{cursor:pointer;background:0 0;border:none;border-radius:6px;padding:6px 14px;font-size:13px;transition:all .2s}.view-toggle button.active{background:var(--color-surface);color:var(--color-primary);box-shadow:var(--shadow);font-weight:600}.card{background:var(--color-surface);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:16px;padding:24px}.card h2{color:var(--color-primary);margin-bottom:12px;font-size:18px}.btn{border-radius:var(--radius-sm);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-family:inherit;font-size:15px;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:#234a31;transform:translateY(-1px)}.btn-secondary{background:var(--color-primary-light);color:var(--color-primary)}.btn-secondary:hover{background:#d5e5da}.btn-ghost{color:var(--color-text-secondary);border:1px solid var(--color-border);background:0 0}.btn-ghost:hover{background:var(--color-bg)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.option-list{flex-direction:column;gap:10px;margin:16px 0;display:flex}.option-btn{background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;text-align:left;align-items:center;width:100%;padding:14px 18px;font-family:inherit;font-size:15px;transition:all .2s;display:flex}.option-btn:hover{border-color:var(--color-primary);background:var(--color-primary-light)}.option-btn.selected{border-color:var(--color-primary);background:var(--color-primary-light);font-weight:500}.option-btn.correct{border-color:var(--color-success);background:#e8f5e9}.option-btn.incorrect{border-color:var(--color-warning);background:#fff8e1}.fill-blank-group{flex-direction:column;gap:12px;margin:16px 0;display:flex}.fill-blank-item{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.fill-blank-item label{min-width:200px;font-size:15px}.fill-blank-item input{border:2px solid var(--color-border);border-radius:var(--radius-sm);width:140px;padding:10px 14px;font-family:inherit;font-size:15px}.fill-blank-item input:focus{border-color:var(--color-primary);outline:none}.fill-blank-item input.correct{border-color:var(--color-success);background:#e8f5e9}.fill-blank-item input.incorrect{border-color:var(--color-warning);background:#fff8e1}.hint-section{border-top:1px solid var(--color-border);margin-top:20px;padding-top:16px}.hint-content{border-left:4px solid var(--color-accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:#fffbf0;margin:8px 0;padding:12px 16px;font-size:14px}.hint-level-label{color:var(--color-accent);text-transform:uppercase;font-size:12px;font-weight:600}.parent-panel{border-radius:var(--radius);background:#f5f0eb;border:1px solid #e0d5c8;margin-top:24px;padding:16px}.parent-panel h4{color:#7a5c3a;margin-bottom:8px;font-size:14px}.parent-coach{color:#5a4a3a;border-radius:var(--radius-sm);background:#fff;margin-bottom:12px;padding:8px 12px;font-size:13px}.parent-record-options{flex-wrap:wrap;gap:8px;display:flex}.parent-record-options button{border-radius:var(--radius-sm);cursor:pointer;background:#fff;border:1px solid #d0c0b0;padding:8px 14px;font-family:inherit;font-size:13px}.parent-record-options button:hover{background:#f0e8e0}.parent-record-options button.selected{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.screen-nav{border-top:1px solid var(--color-border);justify-content:space-between;align-items:center;margin-top:24px;padding-top:16px;display:flex}.screen-phase{color:var(--color-text-secondary);font-size:13px}.difficulty-badge{border-radius:10px;padding:2px 8px;font-size:11px;font-weight:600}.difficulty-basic{color:#2e7d32;background:#e8f5e9}.difficulty-medium{color:#e65100;background:#fff3e0}.difficulty-advanced{color:#c62828;background:#fce4ec}.draw-segments{gap:4px;margin:16px 0;display:flex}.draw-segment{border:2px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;justify-content:center;align-items:center;width:60px;height:60px;font-size:20px;transition:all .2s;display:flex}.draw-segment:hover{border-color:var(--color-primary)}.draw-segment.active{background:var(--color-primary-light);border-color:var(--color-primary)}.trial-container{margin:16px 0}.trial-slider{width:100%;margin:12px 0}.trial-values{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px;margin-top:12px;display:grid}.trial-value{background:var(--color-primary-light);border-radius:var(--radius-sm);text-align:center;padding:10px;font-size:14px}.trial-value.target{border:2px solid var(--color-success);background:#e8f5e9}.journey-list{flex-direction:column;gap:12px;display:flex}.journey-item{background:var(--color-surface);border-radius:var(--radius);box-shadow:var(--shadow);cursor:pointer;justify-content:space-between;align-items:center;padding:16px 20px;transition:all .2s;display:flex}.journey-item:hover{box-shadow:var(--shadow-lg);transform:translate(4px)}.journey-item.locked{opacity:.5;cursor:not-allowed}.journey-status{border-radius:20px;padding:4px 10px;font-size:13px;font-weight:500}.status-completed{color:var(--color-success);background:#e8f5e9}.status-in_progress{color:var(--color-warning);background:#fff8e1}.status-not_started{background:var(--color-border);color:var(--color-text-secondary)}.discovery-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;display:grid}.discovery-card{background:var(--color-surface);border-radius:var(--radius);box-shadow:var(--shadow);border-left:4px solid var(--color-accent);padding:20px}.discovery-card h3{color:var(--color-primary);margin-bottom:8px;font-size:15px}.discovery-card .source{color:var(--color-text-secondary);font-size:12px}.dashboard-section{margin-bottom:24px}.dashboard-section h3{color:var(--color-primary);margin-bottom:12px;font-size:16px}.evidence-timeline{max-height:400px;overflow-y:auto}.evidence-item{border-left:3px solid var(--color-primary);background:var(--color-surface);border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin-bottom:8px;padding:10px 14px;font-size:13px}.evidence-item .metric{color:var(--color-primary);font-weight:600}.evidence-item .time{color:var(--color-text-secondary);font-size:12px}.mastery-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;display:grid}.mastery-item{background:var(--color-surface);border-radius:var(--radius-sm);padding:12px;font-size:13px}.mastery-item .metric-name{margin-bottom:4px;font-weight:600}.mastery-status{border-radius:10px;padding:2px 8px;font-size:12px;display:inline-block}.text-input-area{border:2px solid var(--color-border);border-radius:var(--radius-sm);resize:vertical;width:100%;min-height:80px;margin:12px 0;padding:12px;font-family:inherit;font-size:15px}.text-input-area:focus{border-color:var(--color-primary);outline:none}.feedback{border-radius:var(--radius-sm);margin:12px 0;padding:12px 16px;font-size:14px}.feedback-info{background:var(--color-primary-light);color:var(--color-primary)}.feedback-success{color:var(--color-success);background:#e8f5e9}.feedback-warning{color:var(--color-warning);background:#fff8e1}.progress-bar{background:var(--color-border);border-radius:4px;height:8px;margin:8px 0;overflow:hidden}.progress-bar-fill{background:var(--color-primary);border-radius:4px;height:100%;transition:width .3s}@media (width<=600px){.app-container{padding:12px}.card{padding:16px}.nav-links{gap:8px}.nav-links a{padding:4px 8px;font-size:13px}.fill-blank-item label{min-width:100%}}.loading{min-height:50vh;color:var(--color-text-secondary);justify-content:center;align-items:center;font-size:16px;display:flex}.empty-state{text-align:center;color:var(--color-text-secondary);padding:40px 20px}.empty-state h3{color:var(--color-text);margin-bottom:8px}@media print{@page{size:A4;margin:15mm 12mm}body{font-size:12pt;line-height:1.5;background:#fff!important}.app-container{max-width:100%!important;padding:0!important}.top-nav,.nav-links,.view-toggle,.no-print,.btn{display:none!important}.print-worksheet{box-shadow:none!important;border:none!important;margin:0!important;padding:0!important}.print-worksheet h1{margin-bottom:4mm;font-size:18pt;color:#1a1a1a!important}.print-worksheet h2{border-bottom:1px solid #ccc;margin-top:8mm;margin-bottom:3mm;padding-bottom:2mm;font-size:14pt;color:#2d5a3d!important}.print-worksheet h3{margin-top:5mm;margin-bottom:2mm;font-size:12pt}.print-problem{page-break-inside:avoid;margin-bottom:6mm}.print-problem-text{margin-bottom:3mm;font-size:12pt;font-weight:500}.print-answer-area{background:repeating-linear-gradient(#0000,#0000 7mm,#eee 7mm 7.2mm);border:1px solid #ddd;min-height:25mm;margin-top:2mm;padding:3mm}.print-answer-area.small{min-height:15mm}.print-answer-area.large{min-height:40mm}.print-hint-box{background:#fffbf0;border:1px dashed #c4956a;margin-top:3mm;padding:3mm;font-size:10pt}.print-hint-box .hint-label{color:#c4956a;margin-bottom:2mm;font-weight:700}.print-reflection-area{background:repeating-linear-gradient(#0000,#0000 7mm,#eee 7mm 7.2mm);border:1px solid #ddd;min-height:20mm;margin-top:2mm;padding:3mm}.print-parent-section{color:#555;border-top:2px solid #2d5a3d;margin-top:10mm;padding-top:5mm;font-size:10pt}.print-parent-section h3{color:#2d5a3d}.print-footer{text-align:center;color:#999;margin-top:10mm;font-size:9pt}.print-grid{grid-template-columns:1fr 1fr;gap:5mm;display:grid}.print-meta{color:#666;justify-content:space-between;margin-bottom:5mm;font-size:10pt;display:flex}}.print-preview{background:#fff;border-radius:8px;max-width:210mm;margin:0 auto;padding:20px;box-shadow:0 2px 12px #0000001a}