:root{--bg-app:#080c16;--bg-sidebar:#0f1626;--bg-card:#131e36a6;--bg-card-hover:#1d2c4dcc;--bg-input:#151f33;--border-color:#2b3e6399;--border-color-focus:#6366f1cc;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#64748b;--primary-color:#6366f1;--primary-hover:#4f46e5;--success-color:#10b981;--success-bg:#10b98126;--danger-color:#f43f5e;--danger-bg:#f43f5e26;--warning-color:#fbbf24;--accent-purple:#a855f7;--accent-teal:#14b8a6;--accent-rose:#f43f5e;--accent-amber:#f59e0b;--accent-blue:#0ea5e9;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--shadow-lg:0 10px 15px -3px #0003, 0 4px 6px -2px #0000001a;--shadow-neon:0 0 15px #6366f14d;--font-family:"Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--transition-fast:.2s cubic-bezier(.4, 0, .2, 1);--transition-normal:.3s cubic-bezier(.4, 0, .2, 1);--sidebar-width:360px;--header-height:70px}[data-theme=light]{--bg-app:#f1f5f9;--bg-sidebar:#fff;--bg-card:#fffc;--bg-card-hover:#f8fafcf2;--bg-input:#f8fafc;--border-color:#e2e8f0;--border-color-focus:#6366f199;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--primary-color:#4f46e5;--primary-hover:#3730a3;--success-bg:#10b9811a;--danger-bg:#f43f5e1a;--shadow-neon:0 0 15px #6366f126}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-app);color:var(--text-primary);min-height:100vh;transition:background-color var(--transition-normal), color var(--transition-normal);overflow-x:hidden}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-sm)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.app-container{min-height:100vh;display:flex;position:relative}.sidebar{width:var(--sidebar-width);background-color:var(--bg-sidebar);border-right:1px solid var(--border-color);z-index:10;height:100vh;transition:transform var(--transition-normal), background-color var(--transition-normal);flex-direction:column;display:flex;position:sticky;top:0}.sidebar-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:24px;display:flex}.logo-section{align-items:center;gap:10px;display:flex}.logo-icon{background:linear-gradient(135deg, var(--primary-color) 0%, var(--accent-purple) 100%);color:#fff;width:32px;height:32px;box-shadow:var(--shadow-neon);border-radius:8px;justify-content:center;align-items:center;font-size:18px;font-weight:700;display:flex}.logo-text{letter-spacing:-.5px;background:linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary) 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:20px;font-weight:700}.controls-section{gap:8px;display:flex}.icon-btn{border:1px solid var(--border-color);color:var(--text-secondary);border-radius:var(--radius-sm);cursor:pointer;width:36px;height:36px;transition:all var(--transition-fast);background:0 0;justify-content:center;align-items:center;display:flex}.icon-btn:hover{background-color:var(--bg-card-hover);color:var(--text-primary);border-color:var(--border-color-focus)}.sidebar-search{padding:16px 24px 8px}.search-wrapper{align-items:center;display:flex;position:relative}.search-input{background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-md);width:100%;color:var(--text-primary);font-family:var(--font-family);transition:all var(--transition-fast);padding:12px 14px 12px 38px;font-size:14px}.search-input:focus{border-color:var(--primary-color);outline:none;box-shadow:0 0 0 2px #6366f126}.search-icon{color:var(--text-muted);pointer-events:none;font-size:16px;position:absolute;left:14px}.topic-creator{border-bottom:1px solid var(--border-color);padding:8px 24px 20px}.topic-creator-form{background:var(--bg-card);border-radius:var(--radius-md);border:1px solid var(--border-color);flex-direction:column;gap:12px;padding:14px;display:flex}.form-title{text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary);font-size:13px;font-weight:600}.topic-input{background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);font-family:var(--font-family);padding:10px 12px;font-size:14px}.topic-input:focus{border-color:var(--primary-color);outline:none}.color-picker{justify-content:space-between;gap:8px;margin-top:4px;display:flex}.color-dot{cursor:pointer;width:20px;height:20px;transition:transform var(--transition-fast), border-color var(--transition-fast);border:2px solid #0000;border-radius:50%}.color-dot:hover{transform:scale(1.15)}.color-dot.active{border-color:#fff;transform:scale(1.1);box-shadow:0 0 5px #ffffff80}.submit-btn{background:var(--primary-color);color:#fff;border-radius:var(--radius-sm);font-family:var(--font-family);cursor:pointer;transition:background-color var(--transition-fast);border:none;justify-content:center;align-items:center;gap:6px;padding:10px;font-size:13px;font-weight:600;display:flex}.submit-btn:hover{background-color:var(--primary-hover)}.sidebar-content{flex:1;padding:20px 24px;overflow-y:auto}.section-label{text-transform:uppercase;color:var(--text-muted);margin-bottom:12px;font-size:12px;font-weight:700;display:block}.topic-list{flex-direction:column;gap:10px;display:flex}.topic-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);text-align:left;cursor:pointer;transition:all var(--transition-normal);flex-direction:column;gap:12px;padding:16px;display:flex;position:relative;overflow:hidden}.topic-card:before{content:"";background-color:var(--topic-color,var(--primary-color));opacity:.8;width:4px;height:100%;position:absolute;top:0;left:0}.topic-card:hover{background:var(--bg-card-hover);border-color:#6366f14d;transform:translateY(-2px)}.topic-card.active{background:var(--bg-card-hover);border-color:var(--primary-color);box-shadow:0 4px 15px #00000026,0 0 10px #6366f11a}.topic-card-header{justify-content:space-between;align-items:flex-start;gap:10px;display:flex}.topic-card-title{color:var(--text-primary);word-break:break-word;font-size:15px;font-weight:600;line-height:1.3}.topic-card-actions{opacity:0;transition:opacity var(--transition-fast);gap:4px;display:flex}.topic-card:hover .topic-card-actions{opacity:1}.card-action-btn{color:var(--text-muted);cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;border-radius:4px;padding:4px}.card-action-btn:hover{color:var(--text-primary);background-color:#ffffff14}.card-action-btn.delete-btn:hover{color:var(--danger-color);background-color:var(--danger-bg)}.topic-card-stats{color:var(--text-secondary);justify-content:space-between;align-items:center;font-size:12px;display:flex}.topic-progress-wrapper{flex-direction:column;gap:6px;width:100%;display:flex}.progress-track{background-color:var(--bg-input);border-radius:3px;width:100%;height:6px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--topic-color,var(--primary-color)) 0%, var(--accent-purple) 100%);height:100%;transition:width var(--transition-normal) ease-out;border-radius:3px}.empty-state{text-align:center;color:var(--text-muted);padding:30px 10px;font-size:14px}.empty-state-icon{margin-bottom:12px;font-size:32px;display:block}.main-content{height:100vh;transition:background-color var(--transition-normal);background:radial-gradient(circle at 70% 30%,#6366f10d 0%,#0000 60%);flex-direction:column;flex:1;display:flex;overflow:hidden}.mobile-bar{height:var(--header-height);background-color:var(--bg-sidebar);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:0 20px;display:none}.detail-header{border-bottom:1px solid var(--border-color);background:var(--bg-sidebar);justify-content:space-between;align-items:center;gap:24px;padding:32px 40px;display:flex}.detail-title-section{flex:1}.detail-title-row{align-items:center;gap:16px;margin-bottom:8px;display:flex}.detail-color-indicator{width:16px;height:16px;box-shadow:0 0 8px var(--topic-color);border-radius:50%}.detail-title{color:var(--text-primary);letter-spacing:-.5px;font-size:26px;font-weight:700}.detail-edit-form{gap:10px;width:100%;max-width:500px;display:flex}.detail-edit-input{background-color:var(--bg-input);border:1px solid var(--primary-color);border-radius:var(--radius-sm);color:var(--text-primary);font-size:20px;font-weight:600;font-family:var(--font-family);flex:1;padding:8px 12px}.detail-edit-input:focus{outline:none}.detail-meta{color:var(--text-muted);font-size:13px}.detail-stats{background-color:var(--bg-input);border-radius:var(--radius-md);border:1px solid var(--border-color);align-items:center;gap:20px;padding:16px 24px;display:flex}.stat-item{flex-direction:column;align-items:center;display:flex}.stat-val{color:var(--text-primary);font-size:20px;font-weight:700}.stat-lbl{color:var(--text-muted);text-transform:uppercase;margin-top:2px;font-size:11px;font-weight:600}.stat-divider{background-color:var(--border-color);width:1px;height:30px}.detail-content{flex-direction:column;flex:1;gap:30px;width:100%;max-width:900px;margin:0 auto;padding:40px;display:flex;overflow-y:auto}.todo-controls-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);flex-direction:column;gap:20px;padding:24px;display:flex}.todo-add-form{gap:12px;display:flex}.todo-input-wrapper{flex:1;position:relative}.todo-add-input{background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-md);width:100%;color:var(--text-primary);font-family:var(--font-family);transition:all var(--transition-fast);padding:14px 16px 14px 44px;font-size:15px}.todo-add-input:focus{border-color:var(--primary-color);outline:none;box-shadow:0 0 0 3px #6366f11f}.todo-add-icon{color:var(--text-muted);pointer-events:none;position:absolute;top:50%;left:16px;transform:translateY(-50%)}.priority-selector{background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:4px;display:flex}.priority-option{border-radius:var(--radius-sm);cursor:pointer;color:var(--text-secondary);transition:all var(--transition-fast);background:0 0;border:none;padding:8px 14px;font-size:12px;font-weight:600}.priority-option.active{background-color:var(--bg-sidebar);color:var(--text-primary);box-shadow:var(--shadow-sm)}.priority-option.low.active{color:var(--accent-blue)}.priority-option.medium.active{color:var(--warning-color)}.priority-option.high.active{color:var(--danger-color)}.add-btn{background:var(--primary-color);color:#fff;border-radius:var(--radius-md);font-family:var(--font-family);cursor:pointer;transition:background-color var(--transition-fast);border:none;padding:0 24px;font-weight:600}.add-btn:hover{background-color:var(--primary-hover)}.filter-row{border-top:1px solid var(--border-color);justify-content:space-between;align-items:center;padding-top:10px;display:flex}.filter-group{gap:8px;display:flex}.filter-btn{color:var(--text-secondary);border-radius:var(--radius-sm);font-family:var(--font-family);cursor:pointer;transition:all var(--transition-fast);background-color:#0000;border:1px solid #0000;padding:6px 14px;font-size:13px;font-weight:500}.filter-btn:hover{color:var(--text-primary);background-color:var(--bg-input)}.filter-btn.active{background-color:var(--bg-input);border-color:var(--border-color);color:var(--primary-color);font-weight:600}.search-todo-input{background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);width:200px;color:var(--text-primary);font-family:var(--font-family);padding:6px 12px;font-size:13px}.search-todo-input:focus{border-color:var(--primary-color);width:240px;transition:width var(--transition-normal);outline:none}.todo-list-wrapper{flex-direction:column;gap:12px;display:flex}.todo-item-card{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);transition:all var(--transition-normal);justify-content:space-between;align-items:center;gap:16px;padding:16px 20px;animation:.3s ease-out fadeIn;display:flex}.todo-item-card:hover{background-color:var(--bg-card-hover);border-color:#6366f140;transform:translate(4px)}.todo-item-left{flex:1;align-items:center;gap:14px;display:flex}.checkbox-container{cursor:pointer;-webkit-user-select:none;user-select:none;width:22px;height:22px;display:block;position:relative}.checkbox-container input{opacity:0;cursor:pointer;width:0;height:0;position:absolute}.checkmark{background-color:var(--bg-input);border:2px solid var(--border-color);width:22px;height:22px;transition:all var(--transition-fast);border-radius:6px;position:absolute;top:0;left:0}.checkbox-container:hover input~.checkmark{border-color:var(--primary-color)}.checkbox-container input:checked~.checkmark{background-color:var(--success-color);border-color:var(--success-color)}.checkmark:after{content:"";display:none;position:absolute}.checkbox-container input:checked~.checkmark:after{display:block}.checkbox-container .checkmark:after{border:2px solid #fff;border-width:0 2px 2px 0;width:5px;height:10px;top:3px;left:7px;transform:rotate(45deg)}.todo-text-wrapper{flex:1}.todo-text{color:var(--text-primary);transition:all var(--transition-fast);word-break:break-word;font-size:15px;line-height:1.4}.todo-item-card.completed .todo-text{color:var(--text-muted);text-decoration:line-through}.todo-edit-input{background-color:var(--bg-input);border:1px solid var(--primary-color);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);font-family:var(--font-family);padding:6px 10px;font-size:15px}.todo-edit-input:focus{outline:none}.priority-badge{text-transform:uppercase;letter-spacing:.5px;border-radius:12px;padding:4px 8px;font-size:11px;font-weight:700}.priority-badge.low{color:var(--accent-blue);background-color:#0ea5e926}.priority-badge.medium{color:var(--warning-color);background-color:#f59e0b26}.priority-badge.high{background-color:var(--danger-bg);color:var(--danger-color)}.todo-actions{gap:6px;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.welcome-panel{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:20px;padding:40px;display:flex}.welcome-logo{background:linear-gradient(135deg, var(--primary-color) 0%, var(--accent-purple) 100%);color:#fff;width:80px;height:80px;box-shadow:var(--shadow-neon);border-radius:24px;justify-content:center;align-items:center;margin-bottom:10px;font-size:40px;font-weight:800;display:flex}.welcome-panel h2{color:var(--text-primary);font-size:32px;font-weight:700}.welcome-panel p{color:var(--text-secondary);max-width:500px;font-size:16px;line-height:1.6}.welcome-steps{text-align:left;background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border-color);flex-direction:column;gap:12px;margin-top:10px;padding:24px;display:flex}.welcome-step{color:var(--text-secondary);align-items:center;gap:12px;font-size:14px;display:flex}.step-num{background-color:var(--bg-input);width:24px;height:24px;color:var(--primary-color);border:1px solid var(--border-color);border-radius:50%;justify-content:center;align-items:center;font-size:12px;font-weight:700;display:flex}.modal-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100;background-color:#05080fcc;justify-content:center;align-items:center;width:100vw;height:100vh;animation:.2s ease-out fadeIn;display:flex;position:fixed;top:0;left:0}.modal-content{background-color:var(--bg-sidebar);border:1px solid var(--border-color);border-radius:var(--radius-lg);width:100%;max-width:440px;box-shadow:var(--shadow-lg);flex-direction:column;gap:20px;padding:30px;display:flex}.modal-title{color:var(--text-primary);font-size:20px;font-weight:700}.modal-text{color:var(--text-secondary);font-size:15px;line-height:1.5}.modal-actions{justify-content:flex-end;gap:12px;display:flex}.btn-secondary{background-color:var(--bg-input);border:1px solid var(--border-color);color:var(--text-primary);border-radius:var(--radius-sm);font-family:var(--font-family);cursor:pointer;transition:all var(--transition-fast);padding:10px 18px;font-weight:600}.btn-secondary:hover{background-color:var(--bg-card-hover)}.btn-danger{background-color:var(--danger-color);color:#fff;border-radius:var(--radius-sm);font-family:var(--font-family);cursor:pointer;transition:all var(--transition-fast);border:none;padding:10px 18px;font-weight:600}.btn-danger:hover{background-color:#e11d48}@media (width<=768px){.app-container{flex-direction:column}.sidebar{border-right:none;border-bottom:1px solid var(--border-color);width:100%;height:auto;position:relative}.sidebar.hidden-mobile{display:none}.main-content{height:calc(100vh - var(--header-height))}.mobile-bar{display:flex}.detail-header{flex-direction:column;align-items:flex-start;gap:16px;padding:20px}.detail-stats{justify-content:space-around;width:100%}.detail-content{padding:20px}.todo-controls-card{padding:16px}.todo-add-form{flex-direction:column}.filter-row{flex-direction:column;align-items:flex-start;gap:12px}.search-todo-input,.search-todo-input:focus{width:100%}}