* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #ea580c;
            --primary-dark: #c2410c;
            --secondary: #f97316;
            --background: #ffffff;
            --surface: #f8fafc;
            --surface-hover: #f1f5f9;
            --text: #0f172a;
            --text-muted: #64748b;
            --border: #e2e8f0;
            --success: #10b981;
            --warning: #f59e0b;
            --error: #ef4444;
            --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
        }

        [data-theme="dark"] {
            --background: #0f172a;
            --surface: #1e293b;
            --surface-hover: #334155;
            --text: #f8fafc;
            --text-muted: #94a3b8;
            --border: #334155;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background-color: var(--background);
            color: var(--text);
            line-height: 1.6;
            transition: all 0.3s ease;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            padding: 20px;
            background: var(--surface);
            border-radius: 12px;
            box-shadow: var(--shadow);
        }

        .header h1 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
        }

        .theme-toggle {
            background: var(--primary);
            color: white;
            border: none;
            padding: 10px 16px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .theme-toggle:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
        }

        .grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 30px;
        }

        .card {
            background: var(--surface);
            padding: 24px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }

        .card h2 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--text);
        }

        .form-group {
            margin-bottom: 16px;
        }

        .form-group label {
            display: block;
            margin-bottom: 6px;
            font-weight: 500;
            color: var(--text);
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border);
            border-radius: 8px;
            background: var(--background);
            color: var(--text);
            font-size: 14px;
            transition: all 0.2s ease;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgb(234 88 12 / 0.1);
        }

        .btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 500;
            font-size: 14px;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
        }

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

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

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

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

        .expense-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px;
            border: 1px solid var(--border);
            border-radius: 8px;
            margin-bottom: 12px;
            background: var(--background);
            transition: all 0.2s ease;
        }

        .expense-item:hover {
            background: var(--surface-hover);
            transform: translateY(-1px);
        }

        .expense-details h3 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .expense-meta {
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        .expense-amount {
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--primary);
        }

        .expense-actions {
            display: flex;
            gap: 8px;
        }

        .category-badge {
            display: inline-block;
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: 500;
            margin-right: 8px;
        }

        .category-food { background: #fef3c7; color: #92400e; }
        .category-travel { background: #dbeafe; color: #1e40af; }
        .category-utilities { background: #d1fae5; color: #065f46; }
        .category-others { background: #f3e8ff; color: #7c3aed; }

        [data-theme="dark"] .category-food { background: #451a03; color: #fbbf24; }
        [data-theme="dark"] .category-travel { background: #1e3a8a; color: #60a5fa; }
        [data-theme="dark"] .category-utilities { background: #064e3b; color: #34d399; }
        [data-theme="dark"] .category-others { background: #581c87; color: #a78bfa; }

        .filters {
            display: flex;
            gap: 12px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .summary-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 16px;
            margin-bottom: 30px;
        }

        .summary-card {
            background: var(--surface);
            padding: 20px;
            border-radius: 12px;
            text-align: center;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }

        .summary-card h3 {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .summary-card .amount {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
        }

        .chart-container {
            position: relative;
            height: 300px;
            margin: 20px 0;
        }

        .budget-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
        }

        .budget-progress {
            width: 100%;
            height: 8px;
            background: var(--border);
            border-radius: 4px;
            overflow: hidden;
            margin: 8px 0;
        }

        .budget-progress-bar {
            height: 100%;
            background: var(--primary);
            transition: width 0.3s ease;
        }

        .budget-progress-bar.over-budget {
            background: var(--error);
        }

        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1000;
        }

        .modal.show {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .modal-content {
            background: var(--surface);
            padding: 24px;
            border-radius: 12px;
            max-width: 500px;
            width: 90%;
            max-height: 90vh;
            overflow-y: auto;
        }

        .toast {
            position: fixed;
            top: 20px;
            right: 20px;
            background: var(--success);
            color: white;
            padding: 12px 20px;
            border-radius: 8px;
            box-shadow: var(--shadow-lg);
            z-index: 1001;
            transform: translateX(100%);
            transition: transform 0.3s ease;
        }

        .toast.show {
            transform: translateX(0);
        }

        .toast.error {
            background: var(--error);
        }

        @media (max-width: 768px) {
            .grid {
                grid-template-columns: 1fr;
            }
            
            .filters {
                flex-direction: column;
            }
            
            .expense-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            
            .expense-actions {
                align-self: flex-end;
            }
        }