:root{--primary:#6366f1;--primary-light:#818cf8;--primary-dark:#4f46e5;--accent:#f59e0b;--success:#10b981;--danger:#ef4444;--bg:#f8fafc;--card-bg:#fff;--text:#1e293b;--text-light:#64748b;--border:#e2e8f0;--shadow:0 2px 8px #00000014;--shadow-lg:0 8px 32px #0000001f;--radius:16px;--radius-sm:8px;font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden}button{cursor:pointer;font-family:inherit;font-size:inherit;border:none;transition:all .2s}button:active{transform:scale(.96)}input,select{font-family:inherit}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes bounceIn{0%{opacity:0;transform:scale(.3)}50%{transform:scale(1.05)}70%{transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes confetti{0%{opacity:1;transform:translateY(0)rotate(0)}to{opacity:0;transform:translateY(-100px)rotate(720deg)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.fade-in{animation:.4s fadeIn}.bounce-in{animation:.5s bounceIn}#root{min-height:100vh}.home-page{max-width:720px;margin:0 auto;padding:24px 16px}.home-header{border-radius:var(--radius);color:#fff;background:linear-gradient(135deg,#6366f1,#8b5cf6);justify-content:space-between;align-items:center;margin-bottom:24px;padding:20px;display:flex}.logo{align-items:center;gap:14px;display:flex}.logo-icon{font-size:40px}.logo h1{font-size:24px;font-weight:700}.logo-sub{opacity:.85;margin-top:2px;font-size:13px}.home-stats{white-space:nowrap;background:#fff3;border-radius:20px;padding:8px 14px;font-size:14px;font-weight:500}.header-actions{align-items:center;gap:8px;display:flex}.btn-help-icon{cursor:pointer;background:#fff3;border:none;border-radius:50%;justify-content:center;align-items:center;width:38px;height:38px;font-size:22px;transition:all .2s;display:flex}.btn-help-icon:hover{background:#ffffff59;transform:scale(1.1)}.levels-section,.projects-section{margin-bottom:24px}.levels-section h2,.projects-section h2{color:var(--text);margin-bottom:12px;font-size:18px}.levels-grid{flex-direction:column;gap:10px;display:flex}.level-card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);text-align:left;border:2px solid #0000;align-items:center;gap:16px;width:100%;padding:16px 20px;transition:all .25s;display:flex;position:relative}.level-card.unlocked:hover{border-color:var(--card-color,var(--primary));box-shadow:var(--shadow-lg);transform:translate(4px)}.level-card.locked{opacity:.5;cursor:not-allowed}.level-card.completed{border-color:var(--success);background:#f0fdf4}.level-icon{flex-shrink:0;font-size:32px}.level-info h3{color:var(--text);font-size:16px;font-weight:600}.level-info p{color:var(--text-light);margin:2px 0;font-size:13px}.level-age{color:var(--text-light);font-size:11px}.lock-overlay{font-size:24px;position:absolute;top:50%;right:16px;transform:translateY(-50%)}.projects-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;display:grid}.project-card{background:var(--card-bg);border-radius:var(--radius-sm);box-shadow:var(--shadow);text-align:left;cursor:pointer;border:none;justify-content:space-between;align-items:center;width:100%;padding:12px 16px;display:flex}.project-card.demo{border-left:4px solid var(--accent);cursor:pointer;transition:all .2s}.project-card.demo:hover{box-shadow:var(--shadow-lg);transform:translate(4px)}.project-card.user-project .project-info{cursor:pointer;flex:1}.project-info h4{font-size:13px;font-weight:600}.project-time{color:var(--text-light);font-size:11px}.empty-hint{text-align:center;color:var(--text-light);padding:32px}.overlay{z-index:1000;background:#0006;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.save-dialog{border-radius:var(--radius);box-shadow:var(--shadow-lg);background:#fff;width:360px;padding:28px 32px}.save-dialog h3{text-align:center;margin-bottom:16px;font-size:18px}.save-input{border:2px solid var(--border);border-radius:var(--radius-sm);box-sizing:border-box;outline:none;width:100%;padding:12px 16px;font-size:16px;transition:border-color .2s}.save-input:focus{border-color:var(--primary)}.save-msg{text-align:center;color:var(--success);margin:8px 0;font-size:14px;font-weight:600}.save-actions{justify-content:flex-end;gap:10px;margin-top:16px;display:flex}.tutorial-overlay{background:#00000080}.tutorial-modal{text-align:center;box-shadow:var(--shadow-lg);background:#fff;border-radius:24px;width:90%;max-width:380px;padding:40px 36px}.tutorial-icon{margin-bottom:12px;font-size:64px}.tutorial-modal h2{color:var(--text);margin-bottom:12px;font-size:22px}.tutorial-modal p{color:var(--text-light);margin-bottom:20px;font-size:15px;line-height:1.6}.tutorial-dots{justify-content:center;gap:8px;margin-bottom:20px;display:flex}.dot{background:var(--border);border-radius:50%;width:10px;height:10px;transition:all .3s}.dot.active{background:var(--primary);border-radius:5px;width:28px}.tutorial-actions{justify-content:center;gap:10px;display:flex}.playground{background:var(--bg);flex-direction:column;height:100vh;display:flex}.playground-header{border-bottom:1px solid var(--border);background:#fff;flex-shrink:0;align-items:center;gap:12px;padding:8px 16px;display:flex}.btn-back{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);padding:8px 16px;font-size:14px;font-weight:500}.btn-back:hover{background:#e2e8f0}.playground-title{flex:1}.playground-title span{font-size:16px;font-weight:600}.playground-desc{color:var(--text-light);margin-left:8px;font-size:12px;font-weight:400}.playground-actions{gap:8px;display:flex}.btn-save{background:var(--primary);color:#fff}.btn-save:hover{background:var(--primary-dark)}.btn-secondary{background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);padding:10px 24px;font-size:14px;font-weight:500}.btn-secondary:hover{background:#e2e8f0}.btn-text{color:var(--text-light);background:0 0;padding:10px 24px;font-size:14px}.btn-text:hover{color:var(--text)}.btn{border-radius:var(--radius-sm);padding:8px 18px;font-size:14px;font-weight:600}.btn-run{background:var(--success);color:#fff}.btn-run:hover{background:#059669}.btn-run:disabled{opacity:.5;cursor:not-allowed}.btn-code{background:var(--bg);border:1px solid var(--border);color:var(--text)}.btn-code:hover{background:#e2e8f0}.btn-primary{background:var(--primary);color:#fff;border-radius:var(--radius-sm);padding:10px 24px;font-size:14px;font-weight:600}.btn-primary:hover{background:var(--primary-dark)}.btn-success{background:var(--success);color:#fff;border-radius:var(--radius-sm);padding:10px 24px;font-size:14px;font-weight:600}.btn-sm{border-radius:var(--radius-sm);padding:4px 10px;font-size:14px}.btn-danger{color:var(--danger);background:#fee2e2}.btn-danger:hover{background:#fecaca}.playground-body{flex:1;display:flex;overflow:hidden}.workspace-area{flex:1;min-width:300px;position:relative}.blockly-container{position:absolute;inset:0}.blocklyToolboxDiv{background:#f1f5f9!important}.blocklyTreeRow{border-radius:6px!important;margin:2px 4px!important;padding:4px 8px!important}.blocklyTreeSelected{background:#6366f126!important}.blocklyFlyout{background:#f8fafc!important}.preview-area{border-left:1px solid var(--border);background:#fff;flex-direction:column;flex-shrink:0;width:400px;display:flex}.preview-tabs{border-bottom:1px solid var(--border);flex-shrink:0;display:flex}.tab{color:var(--text-light);cursor:pointer;background:#fff;border:none;border-bottom:2px solid #0000;flex:1;padding:10px;font-size:13px;font-weight:500;transition:all .2s}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.tab:hover{color:var(--text)}.preview-canvas{border:none;width:100%;height:400px;display:block}.code-preview{color:#e2e8f0;white-space:pre-wrap;background:#1e293b;flex:1;margin:0;padding:16px;font-family:Cascadia Code,JetBrains Mono,Fira Code,monospace;font-size:13px;line-height:1.6;overflow:auto}.success-overlay{z-index:1000;background:#0006;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.success-modal{text-align:center;box-shadow:var(--shadow-lg);background:#fff;border-radius:24px;max-width:400px;padding:40px 48px}.success-modal .confetti{font-size:64px;animation:.6s bounceIn}.success-modal h2{color:var(--text);margin:16px 0 8px;font-size:20px}.stars{margin:8px 0 20px;font-size:32px;animation:1s infinite pulse}.success-actions{justify-content:center;gap:10px;display:flex}@media (width<=900px){.preview-area{width:300px}.preview-canvas{height:300px}}@media (width<=700px){.playground-body{flex-direction:column}.workspace-area{height:50vh}.preview-area{width:100%;height:50vh}.preview-canvas{height:100%}}.section-tip{color:var(--text-light);font-size:12px;font-weight:400}.project-desc{color:var(--text-light);margin-top:2px;font-size:12px;line-height:1.4}.btn-open{color:var(--primary);white-space:nowrap;font-size:12px;font-weight:600}.open-dialog{border-radius:var(--radius);box-shadow:var(--shadow-lg);background:#fff;flex-direction:column;width:380px;max-height:70vh;padding:24px;display:flex}.open-dialog h3{text-align:center;margin-bottom:16px;font-size:18px}.open-list{flex-direction:column;flex:1;gap:6px;margin-bottom:12px;display:flex;overflow-y:auto}.open-item{border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;text-align:left;background:#fff;align-items:center;gap:8px;padding:10px 14px;transition:all .2s;display:flex}.open-item:hover,.open-item.active{border-color:var(--primary);background:#eef2ff}.open-name{flex:1;font-size:14px;font-weight:500}.open-badge{color:#92400e;background:#fef3c7;border-radius:10px;padding:2px 8px;font-size:11px;font-weight:600}.open-check{font-size:14px}.btn-open-project{background:var(--bg);border:1px solid var(--border);color:var(--text)}.btn-open-project:hover{background:#e2e8f0}.help-page{max-width:720px;margin:0 auto;padding:24px 16px 60px}.help-header{align-items:center;gap:12px;margin-bottom:24px;display:flex}.help-header h1{font-size:22px}.help-content{flex-direction:column;gap:24px;display:flex}.help-section{border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;padding:24px}.help-section h2{color:var(--text);margin-bottom:12px;font-size:18px}.help-section p{color:var(--text-light);margin-bottom:8px;font-size:14px;line-height:1.7}.help-section ul{padding-left:20px}.help-section li{color:var(--text-light);font-size:14px;line-height:1.8}.help-tip{border-radius:var(--radius-sm);color:var(--primary-dark);background:#eef2ff;margin-top:12px;padding:12px 16px;font-size:13px}.help-layout{grid-template-columns:1fr 1fr 1fr;gap:12px;margin:12px 0;display:grid}.help-layout-item{background:var(--bg);border-radius:var(--radius-sm);padding:14px;font-size:13px;line-height:1.6}.help-layout-item ul{margin-top:4px;padding-left:16px}.help-layout-item li{font-size:12px;line-height:1.6}.hl-label{background:var(--primary);color:#fff;border-radius:4px;margin-bottom:6px;padding:2px 8px;font-size:11px;font-weight:600;display:inline-block}.hl-title{margin-bottom:4px;font-size:14px;font-weight:600;display:block}.help-step{background:var(--bg);border-radius:var(--radius-sm);gap:16px;margin:16px 0;padding:16px;display:flex}.step-num{flex-shrink:0;font-size:28px;line-height:1}.help-step strong{color:var(--text);font-size:15px}.help-step p{margin:4px 0 0}.help-code-block{border-radius:var(--radius-sm);background:#1e293b;margin:12px 0;padding:16px}.help-code-block pre{color:#e2e8f0;white-space:pre;margin:0;font-family:Cascadia Code,JetBrains Mono,monospace;font-size:13px;line-height:1.6}.help-faq{background:var(--bg);border-radius:var(--radius-sm);margin:8px 0;padding:12px 16px}.faq-q{margin-bottom:4px;font-size:14px;font-weight:600}.faq-a{color:var(--text-light);font-size:13px;line-height:1.5}.help-footer{text-align:center;padding:24px 0}@media (width<=600px){.help-layout{grid-template-columns:1fr}}.tour-overlay{background:#00000080}.tour-modal{text-align:center;background:#fff;border-radius:24px;width:90%;max-width:400px;padding:40px 36px 32px;position:relative;box-shadow:0 20px 60px #0003}.tour-icon{margin-bottom:12px;font-size:64px;display:block}.tour-title{color:var(--text);margin-bottom:12px;font-size:22px;font-weight:700;line-height:1.3}.tour-desc{color:var(--text-light);margin-bottom:20px;font-size:15px;line-height:1.7}.tour-desc strong{color:var(--text)}.tour-dots{justify-content:center;gap:8px;margin-bottom:20px;display:flex}.tour-dot{background:var(--border);border-radius:50%;width:10px;height:10px;transition:all .3s}.tour-dot.active{background:var(--primary);border-radius:5px;width:28px}.tour-actions{justify-content:center;gap:10px;display:flex}@media (width<=480px){.tour-modal{padding:28px 20px 24px}.tour-icon{font-size:48px}.tour-title{font-size:18px}.tour-desc{font-size:14px}}