body {
    font-family: sans-serif;
    margin: 0;
}
.main-container {
    margin-left: 250px; /* Default for desktop with sidebar */
    padding: 20px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}
.header {
    text-align: center;
}
.header h1 {
    font-size: 2.25rem; /* 36px */
    font-weight: 700;
    color: #1f2937; /* Gray-800 */
    margin: 0;
}
.nav-buttons {
    display: flex;
    justify-content: center;
    gap: 0.5rem; /* 8px */
}
.nav-btn {
    background-color: #ffffff;
    color: #1f2937;
    font-weight: 500;
    padding: 0.5rem 1.5rem; /* 8px 24px */
    border: none;
    border-radius: 9999px; /* rounded-full */
    cursor: pointer;
    transition: all 0.3s ease;
}
.nav-btn:hover {
    background-color: #e5e7eb; /* Gray-200 */
}
.nav-btn.active {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
}
.chart-container {
    position: relative;
    height: 400px;
    width: 100%;
    background-color: #f9fafb; /* Gray-50 */
    border-radius: 0.75rem; /* 12px */
    padding: 1rem;
    box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
}
.chart-section {
    display: flex;
    justify-content: center;
}
.table-section h2 {
    font-size: 1.25rem; /* 20px */
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
}
.transaction-table {
    width: 100%;
    border-collapse: collapse;
    background-color: #ffffff;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    overflow: hidden; /* This is key for rounded corners on the table */
}
.transaction-table thead {
    background-color: #e5e7eb;
}
.transaction-table th {
    padding: 12px 14px;
    text-align: left;
    font-size: 12px;
    font-weight: 500;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.transaction-table th:first-child {
    border-top-left-radius: 0.75rem;
}
.transaction-table th:last-child {
    border-top-right-radius: 0.75rem;
}
.transaction-table th, td {
    border: 1px solid #ddd;
}
.transaction-table tbody tr {
    border-bottom: 1px solid #e5e7eb;
    transition: background-color 0.2s ease-in-out;
}
.transaction-table tbody tr:hover {
    background-color: #f9fafb;
}
.transaction-table td {
    padding: 1rem 1.5rem;
    color: #4b5563; /* Gray-600 */
    white-space: nowrap;
}
.transaction-table td.amount {
    font-weight: 500;
    color: #ef4444; /* Red-500 */
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    .dashboard-container {
        padding: 1rem;
    }
    .header h1 {
        font-size: 1.5rem;
    }
    .nav-btn {
        padding: 0.5rem 1rem;
    }
    .transaction-table th, .transaction-table td {
        padding: 0.75rem 1rem;
    }
}