:root {
            --primary: #4f46e5;
            --primary-dark: #4338ca;
            --secondary: #10b981;
            --accent: #f59e0b;
            --danger: #ef4444;
            --dark: #1f2937;
            --light: #f8fafc;
            --gray: #6b7280;
            --border-radius: 12px;
            --box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background: linear-gradient(135deg, #f0f4ff 0%, #f5f7ff 100%);
            color: var(--dark);
            line-height: 1.6;
            padding: 20px;
            min-height: 100vh;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        header {
            text-align: center;
            margin-bottom: 30px;
            padding: 30px 20px;
            background: linear-gradient(135deg, var(--primary), #7c3aed);
            color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            position: relative;
            overflow: hidden;
        }

        header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.1)"/></svg>');
            background-size: cover;
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            font-weight: 700;
            position: relative;
        }

        .subtitle {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto;
            position: relative;
        }

        .date-display {
            margin-top: 15px;
            font-size: 1.2rem;
            font-weight: 600;
            position: relative;
        }

        .planner-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 25px;
            margin-bottom: 30px;
        }

        @media (max-width: 900px) {
            .planner-container {
                grid-template-columns: 1fr;
            }
        }

        .card {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
            transition: var(--transition);
            border: 1px solid rgba(0, 0, 0, 0.05);
            height: fit-content;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
        }

        .card-title {
            font-size: 1.4rem;
            margin-bottom: 20px;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
            padding-bottom: 10px;
            border-bottom: 2px solid #f0f0f0;
        }

        .card-title i {
            font-size: 1.6rem;
        }

        .input-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }

        .form-control {
            width: 100%;
            padding: 14px 16px;
            border: 2px solid #e2e8f0;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
            background: #fff;
        }

        .form-control:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
        }

        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--primary);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }

        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .btn-secondary {
            background: var(--secondary);
        }

        .btn-secondary:hover {
            background: #0da271;
        }

        .btn-accent {
            background: var(--accent);
        }

        .btn-accent:hover {
            background: #e5940a;
        }

        .btn-danger {
            background: var(--danger);
        }

        .btn-danger:hover {
            background: #dc2626;
        }

        .btn-full {
            width: 100%;
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 0.9rem;
        }

        .action-buttons {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-top: 20px;
        }

        .task-list, .notes-list {
            margin-top: 20px;
            max-height: 400px;
            overflow-y: auto;
            padding-right: 5px;
        }

        .task-item, .note-item {
            background: #f8fafc;
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 12px;
            border-left: 4px solid var(--primary);
            transition: var(--transition);
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
        }

        .task-item:hover, .note-item:hover {
            background: #f1f5f9;
            transform: translateX(5px);
        }

        .task-item.completed {
            opacity: 0.7;
            border-left-color: var(--secondary);
        }

        .task-item.completed .task-text {
            text-decoration: line-through;
        }

        .task-content, .note-content {
            flex: 1;
        }

        .task-text, .note-text {
            margin-bottom: 8px;
            word-break: break-word;
        }

        .task-time, .note-time {
            font-size: 0.85rem;
            color: var(--gray);
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .task-actions, .note-actions {
            display: flex;
            gap: 8px;
        }

        .task-action-btn, .note-action-btn {
            background: none;
            border: none;
            cursor: pointer;
            color: var(--gray);
            font-size: 1.1rem;
            transition: var(--transition);
            padding: 5px;
            border-radius: 4px;
        }

        .task-action-btn:hover, .note-action-btn:hover {
            color: var(--primary);
            background: rgba(79, 70, 229, 0.1);
        }

        .priority-indicator {
            display: inline-block;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            margin-right: 8px;
        }

        .priority-high {
            background: var(--danger);
        }

        .priority-medium {
            background: var(--accent);
        }

        .priority-low {
            background: var(--secondary);
        }

        .stats {
            display: flex;
            justify-content: space-around;
            margin: 25px 0;
            flex-wrap: wrap;
            gap: 20px;
        }

        .stat-item {
            text-align: center;
            padding: 15px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            min-width: 150px;
        }

        .stat-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.95rem;
            color: var(--gray);
        }

        .empty-state {
            text-align: center;
            padding: 30px;
            color: var(--gray);
        }

        .empty-state i {
            font-size: 3rem;
            margin-bottom: 15px;
            opacity: 0.5;
        }

        footer {
            text-align: center;
            margin-top: 50px;
            padding: 25px;
            color: var(--gray);
            font-size: 0.95rem;
            border-top: 1px solid #e2e8f0;
        }

        /* Custom checkbox */
        .checkbox-container {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 15px;
        }

        .custom-checkbox {
            width: 20px;
            height: 20px;
            border: 2px solid #cbd5e1;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
        }

        .custom-checkbox.checked {
            background: var(--primary);
            border-color: var(--primary);
        }

        .custom-checkbox.checked::after {
            content: '✓';
            color: white;
            font-size: 14px;
        }

        /* Tabs */
        .tabs {
            display: flex;
            margin-bottom: 20px;
            border-bottom: 1px solid #e2e8f0;
        }

        .tab {
            padding: 12px 20px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            border-bottom: 3px solid transparent;
        }

        .tab.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            .action-buttons {
                grid-template-columns: 1fr;
            }
            
            h1 {
                font-size: 2rem;
            }
            
            .stats {
                flex-direction: column;
                gap: 15px;
            }
            
            .stat-item {
                min-width: 100%;
            }
        }

        /* Scrollbar styling */
        ::-webkit-scrollbar {
            width: 8px;
        }

        ::-webkit-scrollbar-track {
            background: #f1f1f1;
            border-radius: 10px;
        }

        ::-webkit-scrollbar-thumb {
            background: #c1c1c1;
            border-radius: 10px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: #a8a8a8;
        }