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

body {
    font-family: Arial, sans-serif;
    display: flex;
    min-height: 100vh;
    background-color: #f8f9fa;
    color: #333;
}

/* Thanh điều hướng trái (Sidebar) */
.sidebar {
    width: 220px;
    background-color: #2b3a4a;
    color: #fff;
    padding: 20px;
    flex-shrink: 0;
}

.sidebar h2 {
    font-size: 22px;
    margin-bottom: 25px;
}

.sidebar ul {
    list-style: none;
}

.sidebar ul li {
    margin-bottom: 15px;
}

.sidebar ul li a {
    color: #b8c7ce;
    text-decoration: none;
    font-size: 14px;
    display: block;
}

.sidebar ul li.active a,
.sidebar ul li a:hover {
    color: #ffffff;
    font-weight: bold;
}

/* Nội dung chính bên phải */
.main-content {
    flex: 1;
    padding: 25px 30px;
}

.main-content h2 {
    font-size: 22px;
    margin-bottom: 20px;
    color: #111;
}

/* Thẻ thống kê (Stat Cards) */
.stats-container {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
}

.stat-card {
    background: #fff;
    padding: 18px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    flex: 1;
}

.stat-card h4 {
    font-size: 15px;
    color: #222;
    margin-bottom: 8px;
}

.stat-card p {
    font-size: 13px;
    color: #666;
}

/* Bảng người dùng */
.section-title {
    font-size: 18px;
    margin-bottom: 15px;
    color: #111;
}

.user-table {
    width: 100%;
    border-collapse: collapse;
    background-color: #fff;
}

.user-table th,
.user-table td {
    padding: 12px 15px;
    text-align: left;
    font-size: 13px;
}

.user-table th {
    background-color: #f1f3f5;
    color: #333;
    font-weight: bold;
}

.user-table tr {
    border-bottom: 1px solid #eee;
}

.user-table tr:last-child {
    border-bottom: none;
}