* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f6f9;
    color: #333333;
}

.container {
    width: 95%;
    max-width: 1500px;
    margin: 30px auto;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.page-header h1 {
    margin: 0 0 5px;
    font-size: 28px;
}

.page-header p {
    margin: 0;
    color: #777777;
}

.btn {
    display: inline-block;
    border: none;
    padding: 10px 16px;
    border-radius: 7px;
    text-decoration: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
}

.btn-primary {
    background: #2563eb;
    color: white;
}

.btn-secondary {
    background: #555555;
    color: white;
}

.btn-light {
    background: #eeeeee;
    color: #333333;
}

.btn-edit {
    background: #f59e0b;
    color: white;
    padding: 7px 10px;
}

.btn-delete {
    background: #dc2626;
    color: white;
    padding: 7px 10px;
}

.btn:hover {
    opacity: 0.85;
}

.main-content {
    margin-left: 280px;
    padding: 30px;
    min-height: 100vh;
}