:root {
    --primary-color: #3498db;
    --secondary-color: #2980b9;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

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

.form-container {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    margin: 50px auto;
}

.form-container h2 {
    margin-bottom: 20px;
    color: var(--dark-color);
    text-align: center;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input, 
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
    margin-top: 10px;
}

button:hover {
    background-color: var(--secondary-color);
}

#logout-btn {
    background-color: var(--accent-color);
    width: auto;
    padding: 8px 15px;
}

#logout-btn:hover {
    background-color: #c0392b;
}

.error-message {
    color: var(--accent-color);
    margin-top: 10px;
    text-align: center;
}

#app-section {
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.dashboard {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 15px;
}

.card {
    background: var(--light-color);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
}

.card h4 {
    color: var(--dark-color);
    margin-bottom: 10px;
}

.card p {
    font-size: 24px;
    font-weight: 500;
}

.add-expense {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.expense-list {
    margin-top: 30px;
}

.filters {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.filters select, .filters input {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.filters button {
    width: auto;
    padding: 8px 15px;
    margin: 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: var(--light-color);
    font-weight: 500;
}

tr:hover {
    background-color: #f9f9f9;
}

.action-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 5px;
    margin: 0 5px;
}

.delete-btn {
    color: var(--accent-color);
}

@media (max-width: 768px) {
    .form-container {
        margin: 20px auto;
        padding: 20px;
    }
    
    .summary-cards {
        grid-template-columns: 1fr;
    }
    
    .filters {
        flex-direction: column;
    }
    
    .filters button {
        width: 100%;
    }
}