:root {
    /* Light theme colors */
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #f5f6fa;
    --card-background: #ffffff;
    --text-color: #2c3e50;
    --border-color: #e1e8ed;
    --income-color: #27ae60;
    --expense-color: #e74c3c;
    --chart-background: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] {
    --primary-color: #ecf0f1;
    --secondary-color: #3498db;
    --background-color: #2c3e50;
    --card-background: #34495e;
    --text-color: #ecf0f1;
    --border-color: #445566;
    --income-color: #2ecc71;
    --expense-color: #e74c3c;
    --chart-background: rgba(52, 73, 94, 0.9);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease;
}

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

/* Header Styles */
header {
    background-color: var(--card-background);
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Dashboard Section */
.overview-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.card {
    background-color: var(--card-background);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.card p {
    font-size: 1.5rem;
    font-weight: bold;
}

.income p {
    color: var(--income-color);
}

.expenses p {
    color: var(--expense-color);
}

/* Charts Container */
.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.chart {
    background-color: var(--card-background);
    padding: 1rem;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Form Styles */
.transaction-section, .budget-section, .savings-section {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

form {
    display: grid;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-weight: 500;
}

input, select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--background-color);
    color: var(--text-color);
}

button {
    padding: 0.75rem 1.5rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #2980b9;
}

/* Transactions List */
.transactions-list {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 2rem;
}

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

/* Savings Progress Bar */
.savings-progress {
    margin-top: 1rem;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

/* Export Section */
.export-section {
    background-color: var(--card-background);
    padding: 1.5rem;
    border-radius: 10px;
    margin-top: 2rem;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.export-button {
    background-color: var(--secondary-color);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.export-button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

.export-tip {
    margin-top: 1rem;
    color: var(--text-color);
    font-size: 0.9rem;
}

/* Current Date Time */
.current-datetime {
    font-size: 1rem;
    color: var(--text-color);
    padding: 0.5rem 1rem;
    background-color: var(--background-color);
    border-radius: 5px;
    text-align: center;
}

/* Clear Data Section */
.clear-data-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.clear-button {
    background-color: #e74c3c;
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.clear-button:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
}

.clear-tip {
    margin-top: 1rem;
    color: #e74c3c;
    font-size: 0.9rem;
}

/* Confirmation Dialog */
.confirm-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    max-width: 90%;
    width: 400px;
}

.confirm-dialog h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.confirm-dialog p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.dialog-buttons {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.dialog-buttons button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
}

.confirm-yes {
    background-color: #e74c3c;
    color: white;
}

.confirm-no {
    background-color: var(--border-color);
    color: var(--text-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
    background-color: var(--card-background);
    border-radius: 10px;
}

.api-credits {
    margin-top: 1rem;
    font-size: 0.9rem;
}

.api-credits a {
    color: var(--secondary-color);
    text-decoration: none;
}

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

    .overview-cards {
        grid-template-columns: 1fr;
    }

    .charts-container {
        grid-template-columns: 1fr;
    }
}

/* Dark Mode Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#theme-switch {
    appearance: none;
    width: 40px;
    height: 20px;
    background-color: var(--border-color);
    border-radius: 20px;
    position: relative;
    cursor: pointer;
}

#theme-switch::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: white;
    top: 2px;
    left: 2px;
    transition: transform 0.3s ease;
}

#theme-switch:checked::before {
    transform: translateX(20px);
}

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

.card, .chart, .transaction-section, .budget-section, .savings-section {
    animation: fadeIn 0.5s ease;
}