* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }

        :root {
            --black: #0a0a0a;
            --dark-gray: #121212;
            --charcoal: #1E1E1E;
            --medium-gray: #2A2A2A;
            --light-gray: #3A3A3A;
            --white: #FFFFFF;
            --off-white: #F0F0F0;
            --gold: #FFD700;
            --gold-dark: #B8860B;
            --gold-light: #FFF8DC;
            --purple: #9333EA;
            --purple-light: #A855F7;
            --purple-dark: #7E22CE;
            --green: #10B981;
            --red: #EF4444;
            --border: rgba(255, 215, 0, 0.1);
            --glow: rgba(255, 215, 0, 0.5);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--black);
            min-height: 100vh;
            color: var(--off-white);
            position: relative;
            overflow-x: hidden;
        }

        /* Animated Background */
        .bg-animation {
            position: fixed;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            z-index: -1;
            background: linear-gradient(135deg, var(--black) 0%, var(--dark-gray) 50%, var(--charcoal) 100%);
        }

        .bg-animation::before {
            content: '';
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, var(--purple) 0%, transparent 70%);
            border-radius: 50%;
            top: -300px;
            right: -300px;
            opacity: 0.1;
            animation: pulse 15s ease-in-out infinite;
        }

        .bg-animation::after {
            content: '';
            position: absolute;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, var(--gold) 0%, transparent 70%);
            border-radius: 50%;
            bottom: -200px;
            left: -200px;
            opacity: 0.1;
            animation: pulse 20s ease-in-out infinite reverse;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); opacity: 0.1; }
            50% { transform: scale(1.2); opacity: 0.2; }
        }

        /* Cute Penguin Decorations */
        .penguin-corner {
            position: fixed;
            width: 80px;
            height: 80px;
            z-index: 100;
            pointer-events: none;
            animation: bob 3s ease-in-out infinite;
        }

        .penguin-corner.top-left {
            top: 20px;
            left: 20px;
        }

        .penguin-corner.bottom-right {
            bottom: 20px;
            right: 20px;
            animation-delay: 1.5s;
        }

        @keyframes bob {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            25% { transform: translateY(-5px) rotate(-5deg); }
            75% { transform: translateY(5px) rotate(5deg); }
        }

        .penguin-svg {
            width: 100%;
            height: 100%;
        }

        /* Container */
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        /* Auth Container */
        .auth-container {
            max-width: 450px;
            margin: 80px auto;
            background: linear-gradient(145deg, var(--charcoal), var(--medium-gray));
            padding: 50px 40px;
            border-radius: 25px;
            border: 1px solid var(--border);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5),
                        inset 0 1px 0 rgba(255, 215, 0, 0.1);
            animation: slideUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(40px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .auth-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .auth-header h2 {
            color: var(--gold);
            font-size: 32px;
            margin-bottom: 15px;
            text-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
        }

        .auth-header p {
            color: var(--off-white);
            opacity: 0.7;
            font-size: 14px;
        }

        /* Form Styles */
        .form-group {
            margin-bottom: 25px;
            position: relative;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--gold);
            font-size: 13px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        input, select, textarea {
            width: 100%;
            padding: 14px 18px;
            background: var(--black);
            border: 2px solid var(--border);
            border-radius: 12px;
            font-size: 15px;
            color: var(--off-white);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        input[type="password"] {
            padding-right: 50px;
        }

        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--gold);
            background: var(--charcoal);
            box-shadow: 0 0 0 4px rgba(255, 215, 0, 0.1),
                        0 0 20px rgba(255, 215, 0, 0.2);
        }

        /* Type Toggle Buttons */
        .type-toggle {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-bottom: 25px;
        }

        .type-btn {
            padding: 16px;
            background: var(--black);
            border: 2px solid var(--border);
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .type-btn.income {
            color: var(--green);
        }

        .type-btn.expense {
            color: var(--red);
        }

        .type-btn.active.income {
            background: linear-gradient(135deg, var(--green), #059669);
            color: white;
            border-color: var(--green);
            box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
        }

        .type-btn.active.expense {
            background: linear-gradient(135deg, var(--red), #DC2626);
            color: white;
            border-color: var(--red);
            box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
        }

        /* Password Toggle */
        .password-toggle {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--gold);
            cursor: pointer;
            padding: 5px;
            transition: all 0.3s;
        }

        .password-toggle:hover {
            color: var(--gold-light);
            transform: translateY(-50%) scale(1.1);
        }

        /* Buttons */
        button {
            padding: 14px 28px;
            border: none;
            border-radius: 12px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            text-transform: uppercase;
            letter-spacing: 1px;
            position: relative;
            overflow: hidden;
        }

        button::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.2);
            transform: translate(-50%, -50%);
            transition: width 0.6s, height 0.6s;
        }

        button:active::before {
            width: 300px;
            height: 300px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--gold), var(--gold-dark));
            color: var(--black);
            width: 100%;
            box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(255, 215, 0, 0.4);
        }

        .btn-secondary {
            background: var(--medium-gray);
            color: var(--off-white);
            border: 1px solid var(--border);
        }

        .btn-secondary:hover {
            background: var(--light-gray);
            border-color: var(--gold);
        }

        .btn-purple {
            background: linear-gradient(135deg, var(--purple), var(--purple-dark));
            color: white;
            box-shadow: 0 4px 15px rgba(147, 51, 234, 0.3);
        }

        .btn-purple:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(147, 51, 234, 0.4);
        }

        /* Main App Container */
        .app-container {
            background: var(--charcoal);
            border-radius: 25px;
            overflow: hidden;
            display: none;
            animation: fadeIn 0.6s ease;
            border: 1px solid var(--border);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: scale(0.95); }
            to { opacity: 1; transform: scale(1); }
        }

        /* Header */
        .header {
            background: linear-gradient(135deg, var(--black) 0%, var(--medium-gray) 100%);
            padding: 30px;
            border-bottom: 2px solid var(--gold);
            position: relative;
            overflow: hidden;
        }

        .header::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, var(--gold) 0%, transparent 70%);
            opacity: 0.1;
            animation: rotate 20s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .header h1 {
            font-size: 28px;
            color: var(--gold);
            text-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
        }

        .user-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 15px;
            gap: 10px;
            flex-wrap: wrap;
        }

        .user-email {
            color: var(--off-white);
            opacity: 0.8;
            word-break: break-all;
        }

        /* Navigation Tabs */
        .nav-tabs {
            display: flex;
            background: var(--black);
            padding: 5px;
            border-radius: 15px;
            margin: 20px;
            gap: 5px;
        }

        .nav-tab {
            flex: 1;
            padding: 12px;
            background: transparent;
            color: var(--off-white);
            border: none;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 500;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .nav-tab.active {
            background: linear-gradient(135deg, var(--gold), var(--gold-dark));
            color: var(--black);
            box-shadow: 0 4px 10px rgba(255, 215, 0, 0.3);
        }

        /* Tab Content */
        .tab-content {
            display: none;
            animation: fadeInTab 0.4s ease;
        }

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

        @keyframes fadeInTab {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Main Content Grid */
        .main-content {
            display: grid;
            grid-template-columns: 380px 1fr;
            min-height: 600px;
        }

        /* Sidebar */
        .sidebar {
            background: var(--dark-gray);
            padding: 30px;
            border-right: 1px solid var(--border);
        }

        .sidebar h3 {
            color: var(--gold);
            margin-bottom: 25px;
            font-size: 18px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* Content Area */
        .content {
            padding: 30px;
        }

        /* Summary Cards */
        .budget-summary {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
            margin-bottom: 35px;
        }

        .summary-card {
            background: linear-gradient(145deg, var(--medium-gray), var(--charcoal));
            padding: 30px;
            border-radius: 20px;
            position: relative;
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .summary-card:hover {
            transform: translateY(-5px) scale(1.02);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
        }

        .summary-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--gold), var(--purple));
        }

        .summary-card h3 {
            color: var(--gold);
            font-size: 13px;
            margin-bottom: 15px;
            text-transform: uppercase;
            letter-spacing: 2px;
            opacity: 0.8;
        }

        .summary-card .amount {
            font-size: 36px;
            font-weight: 700;
            background: linear-gradient(135deg, var(--gold), var(--gold-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .summary-card.income .amount {
            background: linear-gradient(135deg, var(--green), #10F981);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .summary-card.expense .amount {
            background: linear-gradient(135deg, var(--red), #FF6B6B);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* Transactions */
        .transactions {
            background: var(--medium-gray);
            border-radius: 20px;
            padding: 30px;
            border: 1px solid var(--border);
        }

        .transactions-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            flex-wrap: wrap;
            gap: 15px;
        }

        .transactions-header h3 {
            color: var(--gold);
            font-size: 20px;
        }

        .filter-buttons {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .filter-btn {
            padding: 8px 16px;
            font-size: 13px;
            background: var(--black);
            color: var(--off-white);
            border: 1px solid var(--border);
            border-radius: 20px;
            transition: all 0.3s;
        }

        .filter-btn.active {
            background: linear-gradient(135deg, var(--purple), var(--purple-dark));
            color: white;
            border-color: var(--purple);
            box-shadow: 0 4px 10px rgba(147, 51, 234, 0.3);
        }

        /* Transaction Items */
        .transaction-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px;
            background: var(--charcoal);
            margin-bottom: 15px;
            border-radius: 15px;
            border: 1px solid var(--border);
            opacity: 0;
            animation: fadeInUp 0.5s ease forwards;
            transition: all 0.3s;
            gap: 15px;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .transaction-item:hover {
            transform: translateX(10px);
            border-color: var(--gold);
            box-shadow: 0 5px 20px rgba(255, 215, 0, 0.1);
        }

        .transaction-info {
            display: flex;
            align-items: center;
            gap: 20px;
            flex: 1;
            min-width: 0;
        }

        .transaction-icon {
            width: 50px;
            height: 50px;
            min-width: 50px;
            border-radius: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            background: var(--black);
            border: 2px solid var(--border);
        }

        .transaction-icon.income {
            border-color: var(--green);
            box-shadow: 0 0 15px rgba(16, 185, 129, 0.2);
        }

        .transaction-icon.expense {
            border-color: var(--red);
            box-shadow: 0 0 15px rgba(239, 68, 68, 0.2);
        }

        .transaction-details {
            flex: 1;
            min-width: 0;
        }

        .transaction-description {
            font-weight: 600;
            color: var(--off-white);
            margin-bottom: 5px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .transaction-meta {
            display: flex;
            gap: 15px;
            font-size: 12px;
            color: var(--gold);
            opacity: 0.7;
            flex-wrap: wrap;
        }

        .transaction-amount {
            font-weight: 700;
            font-size: 20px;
            white-space: nowrap;
        }

        .transaction-amount.income {
            color: var(--green);
        }

        .transaction-amount.expense {
            color: var(--red);
        }

        .delete-btn {
            background: rgba(239, 68, 68, 0.1);
            color: var(--red);
            padding: 10px;
            width: 40px;
            height: 40px;
            min-width: 40px;
            border-radius: 10px;
            border: 1px solid rgba(239, 68, 68, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
        }

        .delete-btn:hover {
            background: var(--red);
            color: white;
            transform: scale(1.1);
        }

        /* Recurring Transactions Section */
        .recurring-section {
            margin-bottom: 30px;
            padding: 25px;
            background: var(--dark-gray);
            border-radius: 20px;
            border: 1px solid var(--border);
        }

        .recurring-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            flex-wrap: wrap;
            gap: 10px;
        }

        .recurring-header h4 {
            color: var(--gold);
            font-size: 16px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .add-recurring-btn {
            background: linear-gradient(135deg, var(--purple), var(--purple-dark));
            color: white;
            padding: 8px 16px;
            font-size: 12px;
            border-radius: 20px;
        }

        .recurring-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 15px;
            background: var(--charcoal);
            border-radius: 12px;
            margin-bottom: 10px;
            border: 1px solid var(--border);
            transition: all 0.3s;
            gap: 10px;
        }

        .recurring-item:hover {
            border-color: var(--purple);
            transform: translateX(5px);
        }

        .recurring-info {
            display: flex;
            align-items: center;
            gap: 15px;
            flex: 1;
            min-width: 0;
        }

        .recurring-details {
            flex: 1;
            min-width: 0;
        }

        .recurring-description {
            font-weight: 600;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .recurring-amount {
            font-size: 20px;
            font-weight: 700;
            opacity: 1;
            white-space: nowrap;
            color: var(--off-white); /* fallback color */
        }

        /* Auto-color based on transaction type */
        .recurring-item.income .recurring-amount {
            color: var(--green);
        }

        .recurring-item.expense .recurring-amount {
            color: var(--red);
        }

        .recurring-frequency {
            background: var(--purple);
            color: white;
            padding: 4px 10px;
            border-radius: 15px;
            font-size: 11px;
            text-transform: uppercase;
            white-space: nowrap;
        }

        /* Frequency Options */
        .frequency-options {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
            gap: 10px;
            margin-top: 10px;
        }

        .frequency-btn {
            padding: 10px;
            background: var(--black);
            border: 2px solid var(--border);
            border-radius: 10px;
            color: var(--off-white);
            cursor: pointer;
            transition: all 0.3s;
            font-size: 13px;
        }

        .frequency-btn.active {
            background: var(--purple);
            color: white;
            border-color: var(--purple);
        }

        /* Charts Section */
        .charts-container {
            padding: 30px;
        }

        .chart-card {
            background: var(--medium-gray);
            border-radius: 20px;
            padding: 30px;
            margin-bottom: 30px;
            border: 1px solid var(--border);
        }

        .chart-card h3 {
            color: var(--gold);
            margin-bottom: 25px;
            font-size: 20px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .chart-controls {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .chart-control-btn {
            padding: 8px 16px;
            background: var(--black);
            color: var(--off-white);
            border: 1px solid var(--border);
            border-radius: 10px;
            font-size: 12px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .chart-control-btn.active {
            background: var(--gold);
            color: var(--black);
        }

        #financeChart, #categoryChart {
            max-height: 400px;
        }

        /* Empty State */
        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: var(--off-white);
            opacity: 0.5;
        }

        .empty-state-icon {
            font-size: 64px;
            margin-bottom: 20px;
        }

        /* Loading */
        .loading-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.9);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            display: none;
        }

        .loading-overlay.active {
            display: flex;
        }

        .loading-content {
            text-align: center;
        }

        .loading-spinner {
            width: 60px;
            height: 60px;
            border: 3px solid var(--border);
            border-top-color: var(--gold);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto 20px;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* Alerts */
        .alert {
            padding: 15px 20px;
            border-radius: 12px;
            margin-bottom: 20px;
            animation: slideDown 0.4s ease;
            border: 1px solid;
        }

        .alert-error {
            background: rgba(239, 68, 68, 0.1);
            color: var(--red);
            border-color: rgba(239, 68, 68, 0.3);
        }

        .alert-success {
            background: rgba(16, 185, 129, 0.1);
            color: var(--green);
            border-color: rgba(16, 185, 129, 0.3);
        }

        @keyframes slideDown {
            from { opacity: 0; transform: translateY(-20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Modal */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.8);
            z-index: 1000;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .modal.active {
            display: flex;
        }

        .modal-content {
            background: var(--charcoal);
            border-radius: 20px;
            padding: 30px;
            max-width: 500px;
            width: 100%;
            max-height: 90vh;
            overflow-y: auto;
            border: 1px solid var(--border);
            animation: modalSlide 0.3s ease;
        }

        @keyframes modalSlide {
            from { opacity: 0; transform: scale(0.9); }
            to { opacity: 1; transform: scale(1); }
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
        }

        .modal-header h3 {
            color: var(--gold);
            font-size: 22px;
        }

        .modal-close {
            background: none;
            border: none;
            color: var(--off-white);
            font-size: 24px;
            cursor: pointer;
            padding: 0;
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .modal-close:hover {
            color: var(--gold);
        }

        /* Mobile Responsive Styles */
        @media (max-width: 768px) {
            .container {
                padding: 10px;
            }

            .auth-container {
                margin: 20px auto;
                padding: 30px 20px;
            }

            .penguin-corner {
                width: 50px;
                height: 50px;
            }

            .penguin-corner.top-left {
                top: 10px;
                left: 10px;
            }

            .penguin-corner.bottom-right {
                bottom: 10px;
                right: 10px;
            }

            .header {
                padding: 20px;
            }

            .header h1 {
                font-size: 24px;
            }

            .user-info {
                flex-direction: column;
                align-items: flex-start;
            }

            .nav-tabs {
                margin: 10px;
                flex-direction: row;
                overflow-x: auto;
                gap: 5px;
            }

            .nav-tab {
                padding: 10px;
                font-size: 12px;
                min-width: 90px;
            }

            .main-content {
                grid-template-columns: 1fr;
            }

            .sidebar {
                border-right: none;
                border-bottom: 1px solid var(--border);
                padding: 20px;
            }

            .content {
                padding: 20px;
            }

            .budget-summary {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .summary-card {
                padding: 20px;
            }

            .summary-card .amount {
                font-size: 28px;
            }

            .transactions {
                padding: 20px;
            }

            .transactions-header {
                flex-direction: column;
                align-items: flex-start;
            }

            .filter-buttons {
                width: 100%;
                justify-content: space-between;
            }

            .transaction-item {
                padding: 15px;
                flex-wrap: wrap;
                gap: 10px;
            }

            .transaction-info {
                flex: 1 1 100%;
                gap: 15px;
            }

            .transaction-icon {
                width: 40px;
                height: 40px;
                min-width: 40px;
                font-size: 20px;
            }

            .transaction-amount {
                font-size: 18px;
                flex: 1;
                text-align: right;
            }

            .delete-btn {
                width: 35px;
                height: 35px;
                min-width: 35px;
                padding: 8px;
            }

            .recurring-section {
                padding: 20px;
            }

            .recurring-item {
                flex-wrap: wrap;
            }

            .recurring-info {
                flex: 1 1 100%;
            }

            .charts-container {
                padding: 20px;
            }

            .chart-card {
                padding: 20px;
            }

            .frequency-options {
                grid-template-columns: 1fr 1fr;
            }

            .type-toggle {
                margin-bottom: 20px;
            }

            .type-btn {
                padding: 14px;
                font-size: 14px;
            }

            .modal-content {
                padding: 20px;
            }
        }

        @media (max-width: 480px) {
            .auth-header h2 {
                font-size: 26px;
            }

            .header h1 {
                font-size: 20px;
            }

            .nav-tab {
                font-size: 11px;
                padding: 8px;
                min-width: 80px;
            }

            .summary-card .amount {
                font-size: 24px;
            }

            .transaction-item {
                padding: 12px;
            }

            .transaction-description {
                font-size: 14px;
            }

            .transaction-amount {
                font-size: 16px;
            }

            .btn-primary, .btn-secondary, .btn-purple {
                padding: 12px 20px;
                font-size: 14px;
            }
        }

        .hidden {
            display: none !important;
        }