:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --background-color: #f8f9fa;
    --card-color: #ffffff;
    --text-color: #333333;
    --subtle-text-color: #777777;
    --danger-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
}
/* Global transitions */
* {
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

/* Smooth animations for expense items */
.expense-item {
    transition: all 0.3s ease;
    transform: translateY(0);
}

.expense-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* Modal animations */
.modal-container {
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-content {
    transition: transform 0.3s ease;
    transform: scale(1);
}

.modal-container.hidden .modal-content {
    transform: scale(0.9);
}

/* Button animations */
.add-expense-btn,
.edit-btn,
.delete-btn,
.form-buttons button {
    transition: all 0.2s ease;
}

.add-expense-btn:hover,
.edit-btn:hover,
.delete-btn:hover,
.form-buttons button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.add-expense-btn:active,
.edit-btn:active,
.delete-btn:active,
.form-buttons button:active {
    transform: translateY(0);
}

/* Filter and sort controls animations */
.filters,
.sort-controls {
    transition: box-shadow 0.3s ease;
}

.filters:hover,
.sort-controls:hover {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.app-container {
    width: 100%;
    max-width: 500px;
    background-color: var(--card-color);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    overflow: hidden;
    padding-bottom: 80px; /* Space for the add button */
    position: relative;
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
    margin: 0;
    font-size: 24px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.summary {
    margin-top: 10px;
    padding: 15px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    backdrop-filter: blur(10px);
}

#summary-date {
    margin: 0;
    opacity: 0.9;
    font-size: 14px;
    font-weight: 500;
}

#summary-total {
    margin: 5px 0 0;
    font-size: 36px;
.export-btn {
    margin-top: 15px;
    padding: 8px 16px;
    background-color: var(--success-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
/* Visualization section */
.visualization-section {
    padding: 20px;
    background-color: var(--card-color);
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.visualization-section h3 {
    margin-top: 0;
    color: var(--text-color);
    font-size: 20px;
    font-weight: 600;
}

.summary-cards {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.summary-card {
    flex: 1;
    min-width: 120px;
    background: linear-gradient(135deg, #f5f7fa, #e4e7f4);
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.summary-card h4 {
    margin: 0 0 10px 0;
    font-size: 14px;
    color: var(--subtle-text-color);
    font-weight: 500;
}

.summary-card p {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-color);
}

.chart-container {
    height: 250px;
    position: relative;
}
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.export-btn:hover {
    background-color: #27ae60;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}
    font-weight: 700;
    letter-spacing: -0.5px;
}

main {
    padding: 10px;
}
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.filter-group {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 120px;
}

.filter-group label {
    font-size: 12px;
    font-weight: bold;
    color: var(--subtle-text-color);
    margin-bottom: 3px;
}

.filter-group input,
.filter-group select {
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ccc;
    font-size: 14px;
}

#clear-filters {
    align-self: flex-end;
    padding: 8px 12px;
    background-color: #e0e0e0;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
}

#clear-filters:hover {
    background-color: #d0d0d0;
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.sort-controls label {
    font-size: 12px;
    font-weight: bold;
    color: var(--subtle-text-color);
}

.sort-controls select {
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ccc;
    font-size: 14px;
}
#expense-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.expense-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    background-color: var(--card-color);
    border-radius: 8px;
    margin-bottom: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.expense-item:hover {
    background-color: #f8f9fa;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.expense-item:last-child {
    border-bottom: none;
}

.expense-details {
    display: flex;
    align-items: center;
    gap: 15px;
}

.expense-category {
    font-size: 24px;
}

.expense-description {
    font-weight: 500;
}

.expense-description small {
    color: var(--subtle-text-color);
    display: block;
    font-weight: 400;
}

.expense-amount {
    font-weight: bold;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.expense-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.note-icon {
    font-size: 12px;
    color: var(--subtle-text-color);
}

.edit-btn, .delete-btn {
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.edit-btn:hover {
    background-color: #e3f2fd;
}

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

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

.add-expense-btn {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    font-size: 36px;
    border: none;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1;
    padding-bottom: 4px;
}

/* Modal Styles */
.modal-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 2px rgba(217, 83, 79, 0.2);
}
    opacity: 1;
    transition: opacity 0.3s;
}

.modal-container.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: white;
    padding: 25px;
    border-radius: 15px;
    width: 90%;
    max-width: 450px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
/* Enhanced form styling */
.form-group input, 
.form-group select, 
.form-group textarea {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 2px solid #e1e5e9;
    font-size: 16px;
    box-sizing: border-box;
    background-color: #f8f9fa;
    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(52, 152, 219, 0.2);
    background-color: #fff;
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.2);
}

/* Enhanced button styling */
.form-buttons button {
    padding: 12px 24px;
    border-radius: 8px;
    border: none;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

#save-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 6px rgba(52, 152, 219, 0.3);
}

#save-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark), #1c6ea4);
    box-shadow: 0 6px 8px rgba(52, 152, 219, 0.4);
    transform: translateY(-2px);
}

#cancel-btn {
    background-color: #e0e0e0;
    color: var(--text-color);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

#cancel-btn:hover {
    background-color: #d0d0d0;
    box-shadow: 0 6px 8px rgba(0,0,0,0.15);
    transform: translateY(-2px);
}
    color: var(--subtle-text-color);
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 16px;
    box-sizing: border-box;
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

.form-buttons button {
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
}

#save-btn {
    background-color: var(--primary-color);
    color: white;
}

#cancel-btn {
    background-color: #e0e0e0;
    color: var(--text-color);
}