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

:root {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --text-primary: #333;
    --text-secondary: #7f8c8d;
    --header-bg: #34495e;
    --accent-color: #3498db;
    --success-color: #2ecc71;
    --border-color: #ddd;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body.dark-mode {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #999;
    --header-bg: #1a1a1a;
    --accent-color: #4a90e2;
    --success-color: #2ecc71;
    --border-color: #444;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: var(--header-bg);
    color: white;
    padding: 20px 30px;
    border-radius: 8px;
    margin-bottom: 30px;
    box-shadow: var(--card-shadow);
}

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

h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.month-display {
    font-size: 1.1rem;
    font-weight: 500;
    opacity: 0.9;
    background-color: rgba(255, 255, 255, 0.15);
    padding: 6px 14px;
    border-radius: 6px;
    width: fit-content;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.datetime-display {
    font-size: 1rem;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
}

.theme-toggle,
.refresh-btn {
    background-color: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.theme-toggle:hover,
.refresh-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

.refresh-btn.spinning {
    animation: spin 1s linear;
}

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

main {
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    margin-bottom: 20px;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background-color: var(--bg-primary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

.stat-card.highlight {
    border: 2px solid var(--accent-color);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.stat-card h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--success-color);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 5px;
    font-weight: 500;
}

.data-section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.loading,
.error {
    text-align: center;
    padding: 40px;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.error {
    color: #e74c3c;
}

.table-container {
    overflow-x: auto;
}

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

thead {
    background-color: var(--header-bg);
    color: white;
    position: sticky;
    top: 0;
    z-index: 10;
}

th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

tbody tr:hover {
    background-color: var(--bg-primary);
}

td {
    padding: 15px;
    color: var(--text-primary);
}

td:last-child {
    font-weight: 600;
    color: var(--success-color);
    font-size: 1.1rem;
}

footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.5rem;
    }

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

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

    .stat-value {
        font-size: 1.5rem;
    }

    main {
        padding: 20px;
    }

    th, td {
        padding: 10px;
        font-size: 0.9rem;
    }
}