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

:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

.flash-messages {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    max-width: 400px;
}

.alert {
    padding: 12px 20px;
    margin-bottom: 10px;
    border-radius: 6px;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--secondary-color);
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border-left: 4px solid var(--warning-color);
}

.alert-danger {
    background-color: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.auth-box {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 450px;
}

.auth-box h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 10px;
    font-size: 2rem;
}

.auth-box h2 {
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.25rem;
    font-weight: 500;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group textarea {
    resize: vertical;
    font-family: inherit;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
}

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

.btn-logout {
    background-color: var(--danger-color);
    color: white;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-logout:hover {
    background-color: #dc2626;
}

.btn-edit {
    background-color: var(--warning-color);
    color: white;
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-edit:hover {
    background-color: #d97706;
}

.btn-delete {
    background-color: var(--danger-color);
    color: white;
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-delete:hover {
    background-color: #dc2626;
}

.auth-footer {
    margin-top: 20px;
    text-align: center;
    color: var(--text-light);
}

.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

.error-message {
    display: none;
    margin-top: 15px;
    padding: 12px;
    background-color: #fee2e2;
    color: #991b1b;
    border-radius: 6px;
    border-left: 4px solid var(--danger-color);
}

.dashboard-container {
    min-height: 100vh;
    background-color: var(--bg-light);
}

.navbar {
    background-color: var(--bg-white);
    padding: 15px 30px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-email {
    color: var(--text-light);
    font-size: 0.9rem;
}

.dashboard-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px;
}

.summary-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.summary-card {
    background: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
}

.summary-card h3 {
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

.expense-form-section,
.budget-section {
    background: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.expense-form-section h2,
.budget-section h2,
.expenses-section h2,
.category-breakdown-section h2 {
    color: var(--text-dark);
    margin-bottom: 20px;
    font-size: 1.25rem;
}

.budget-section h3 {
    color: var(--text-dark);
    margin-bottom: 15px;
    font-size: 1rem;
    font-weight: 600;
}

.overall-budget-form,
.category-budget-form {
    margin-bottom: 15px;
}

.budget-status {
    font-size: 0.85rem;
    margin-top: 5px;
    font-weight: 500;
}

.expenses-section,
.category-breakdown-section {
    background: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.filter-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.filter-section input,
.filter-section select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
}

.expenses-list {
    max-height: 600px;
    overflow-y: auto;
}

.expense-item {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr auto;
    gap: 15px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 10px;
    align-items: center;
    transition: all 0.3s;
}

.expense-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.expense-info h4 {
    color: var(--text-dark);
    margin-bottom: 5px;
    font-size: 1rem;
}

.expense-info p {
    color: var(--text-light);
    font-size: 0.85rem;
}

.expense-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.expense-category {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    text-align: center;
}

.category-Food { background: #dbeafe; color: #1e40af; }
.category-Transportation { background: #fef3c7; color: #92400e; }
.category-Shopping { background: #fce7f3; color: #9f1239; }
.category-Entertainment { background: #e0e7ff; color: #3730a3; }
.category-Bills { background: #fee2e2; color: #991b1b; }
.category-Healthcare { background: #d1fae5; color: #065f46; }
.category-Education { background: #ddd6fe; color: #5b21b6; }
.category-Other { background: #e5e7eb; color: #374151; }

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

.budget-list {
    margin-top: 20px;
}

.budget-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 10px;
}

.budget-item-info h4 {
    color: var(--text-dark);
    margin-bottom: 5px;
}

.budget-item-info p {
    color: var(--text-light);
    font-size: 0.85rem;
}

.category-breakdown {
    display: grid;
    gap: 15px;
}

.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.category-item-name {
    font-weight: 500;
    color: var(--text-dark);
}

.category-item-amount {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.loading {
    text-align: center;
    color: var(--text-light);
    padding: 40px;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--bg-white);
    margin: 5% auto;
    padding: 30px;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close {
    color: var(--text-light);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
}

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

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }

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

    .filter-section {
        grid-template-columns: 1fr;
    }

    .expense-item {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .expense-actions {
        justify-content: center;
    }

    .navbar {
        flex-direction: column;
        gap: 15px;
    }

    .summary-section {
        grid-template-columns: 1fr;
    }
}