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

body {
    font-family: 'Segoe UI', sans-serif;
    background: #f4f6f9;
}

.dashboard {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 220px;
    background: #111827;
    color: white;
    padding: 20px;
}

.sidebar h2 {
    margin-bottom: 30px;
}

.sidebar ul {
    list-style: none;
}

.sidebar li {
    padding: 10px;
    margin-bottom: 10px;
    cursor: pointer;
    border-radius: 6px;
}

.sidebar li:hover,
.sidebar .active {
    background: #3b82f6;
}

.main {
    flex: 1;
    padding: 20px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.card p {
    font-size: 24px;
    font-weight: bold;
    margin-top: 10px;
}

.chart-section {
    background: white;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 30px;
}

.table-section {
    background: white;
    padding: 20px;
    border-radius: 12px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th, td {
    padding: 12px;
    text-align: left;
}

thead {
    background: #f1f1f1;
}

tbody tr:nth-child(even) {
    background: #f9f9f9;
}

.page {
    display: none;
}

.page.active {
    display: block;
}