* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #fff;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.sidebar h1 {
    color: #8B0000;
    font-size: 1.5rem;
    margin-bottom: 30px;
    text-align: center;
}

.sidebar button {
    background-color: #fff;
    border: 1px solid #8B0000;
    color: #8B0000;
    padding: 12px 15px;
    margin-bottom: 10px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
    text-align: left;
}

.sidebar button:hover {
    background-color: #8B0000;
    color: white;
}

.sidebar button.active {
    background-color: #8B0000;
    color: white;
}

.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.page {
    display: none;
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.page.active {
    display: block;
}

h2 {
    color: #8B0000;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

button.action-btn {
    background-color: #8B0000;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    margin-top: 10px;
}

button.action-btn:hover {
    background-color: #a52a2a;
}

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

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f8f9fa;
    color: #8B0000;
    font-weight: 600;
}

tr:hover {
    background-color: #f8f9fa;
}

.alert {
    padding: 10px 15px;
    border-radius: 4px;
    margin: 15px 0;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}