body{margin:0;padding:0}:root{--sidebar-bg:#0f172a;--sidebar-hover:#1e293b;--sidebar-active:#312e81;--accent:#818cf8;--accent-bright:#a5b4fc;--accent-dim:#818cf826;--bg:#f1f5f9;--surface:#fff;--border:#e2e8f0;--border-light:#f1f5f9;--text:#0f172a;--text-muted:#64748b;--text-sidebar:#94a3b8;--text-sidebar-active:#e0e7ff;--danger:#f43f5e;--success:#10b981;--radius-sm:6px;--radius:10px;--radius-lg:16px;--shadow-sm:0 1px 3px #00000014, 0 1px 2px #0000000d;--shadow:0 4px 12px #00000014, 0 2px 6px #0000000d;--transition:.18s ease}*,:before,:after{box-sizing:border-box}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}#root{height:100vh;display:flex;overflow:hidden}.sidebar{background:var(--sidebar-bg);flex-direction:column;flex-shrink:0;gap:4px;width:260px;padding:24px 16px;display:flex;overflow:hidden}.sidebar-logo{border-bottom:1px solid #ffffff12;align-items:center;gap:10px;margin-bottom:16px;padding:0 8px 20px;display:flex}.sidebar-logo-icon{background:linear-gradient(135deg,#818cf8 0%,#a78bfa 100%);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:16px;display:flex}.sidebar-logo h1{color:#fff;letter-spacing:-.2px;margin:0;font-size:15px;font-weight:700}.sidebar-logo p{color:var(--text-sidebar);margin:0;font-size:11px}.sidebar-form{gap:6px;margin-bottom:12px;display:flex}.sidebar-form input[type=text]{border-radius:var(--radius-sm);color:#fff;min-width:0;transition:border-color var(--transition), background var(--transition);background:#ffffff12;border:1px solid #ffffff1a;outline:none;flex:1;padding:8px 10px;font-size:13px}.sidebar-form input[type=text]::placeholder{color:#ffffff4d}.sidebar-form input[type=text]:focus{border-color:var(--accent);background:#818cf81f}.sidebar-form 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10px;display:flex}.topic-item:hover{background:var(--sidebar-hover)}.topic-item.active{background:var(--sidebar-active)}.topic-dot{width:6px;height:6px;transition:background var(--transition);background:#fff3;border-radius:50%;flex-shrink:0}.topic-item.active .topic-dot{background:var(--accent-bright)}.topic-item-name{min-width:0;color:var(--text-sidebar);white-space:nowrap;text-overflow:ellipsis;transition:color var(--transition);flex:1;font-size:13.5px;font-weight:500;overflow:hidden}.topic-item:hover .topic-item-name{color:#fff}.topic-item.active .topic-item-name{color:var(--text-sidebar-active)}.topic-delete-btn{opacity:0;color:#fff6;cursor:pointer;transition:opacity var(--transition), color var(--transition), background var(--transition);background:0 0;border:none;border-radius:4px;flex-shrink:0;padding:2px 4px;font-size:12px;line-height:1}.topic-item:hover .topic-delete-btn{opacity:1}.topic-delete-btn:hover{color:var(--danger);background:#f43f5e26}.main-content{flex-direction:column;flex:1;gap:24px;padding:32px 40px;display:flex;overflow:hidden}.content-header{flex-direction:column;gap:12px;display:flex}.content-header h2{letter-spacing:-.5px;color:var(--text);margin:0;font-size:28px;font-weight:800}.progress-section{align-items:center;gap:12px;display:flex}.progress-bar-track{background:var(--border);border-radius:99px;flex:1;max-width:320px;height:6px;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg,#818cf8,#a78bfa);border-radius:99px;height:100%;transition:width .4s cubic-bezier(.4,0,.2,1)}.progress-label{color:var(--text-muted);white-space:nowrap;font-size:13px}.add-task-form{gap:8px;display:flex}.add-task-form input[type=text]{border:1.5px solid var(--border);border-radius:var(--radius);color:var(--text);background:var(--surface);transition:border-color var(--transition), box-shadow 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var(--transition), box-shadow var(--transition), opacity var(--transition);align-items:center;gap:14px;padding:14px 18px;display:flex;position:relative}.task-row:hover{box-shadow:var(--shadow-sm);border-color:#c7d2fe}.task-row.is-done{opacity:.6;background:var(--border-light)}.task-checkbox-wrapper{flex-shrink:0;width:20px;height:20px;position:relative}.task-checkbox-wrapper input[type=checkbox]{opacity:0;width:0;height:0;position:absolute}.task-checkbox-box{border:2px solid var(--border);cursor:pointer;width:20px;height:20px;transition:border-color var(--transition), background var(--transition);background:#fff;border-radius:6px;justify-content:center;align-items:center;display:flex}.task-checkbox-wrapper input[type=checkbox]:checked+.task-checkbox-box{background:var(--accent);border-color:var(--accent)}.task-checkbox-box:after{content:"";width:5px;height:9px;transition:border-color var(--transition);border:2px solid #0000;border-top:none;border-left:none;transform:rotate(45deg)translate(-1px,-1px)}.task-checkbox-wrapper input[type=checkbox]:checked+.task-checkbox-box:after{border-color:#fff}.task-checkbox-box:hover{border-color:var(--accent)}.task-text{color:var(--text);transition:color var(--transition);flex:1;font-size:14.5px;line-height:1.4}.task-text.is-done{color:var(--text-muted);-webkit-text-decoration:line-through #64748b66;text-decoration:line-through #64748b66}.task-delete-btn{opacity:0;color:var(--text-muted);cursor:pointer;transition:opacity var(--transition), color var(--transition), background var(--transition);background:0 0;border:none;border-radius:6px;padding:4px 6px;font-size:13px;line-height:1}.task-row:hover .task-delete-btn{opacity:1}.task-delete-btn:hover{color:var(--danger);background:#f43f5e14}.empty-state{color:var(--text-muted);text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:12px;padding:60px 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