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

body {
    background-color: #f4f7f6;
    color: #333;
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #2c3e50;
    color: #fff;
    padding-top: 20px;
    display: flex;
    flex-direction: column;
}

.sidebar h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.5rem;
    letter-spacing: 1px;
}

.sidebar a {
    color: #b8c7ce;
    text-decoration: none;
    padding: 15px 25px;
    display: block;
    transition: all 0.3s;
}

.sidebar a:hover, .sidebar a.active {
    background-color: #1a252f;
    color: #fff;
    border-left: 4px solid #3498db;
}

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

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    background: #fff;
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.header h1 {
    font-size: 1.8rem;
    color: #2c3e50;
}

.card {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    border-color: #3498db;
    outline: none;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    color: #fff;
    background-color: #3498db;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    transition: background 0.3s;
}

.btn:hover {
    background-color: #2980b9;
}

.btn-danger {
    background-color: #e74c3c;
}
.btn-danger:hover {
    background-color: #c0392b;
}
.btn-warning {
    background-color: #f1c40f;
    color: #333;
}
.btn-warning:hover {
    background-color: #f39c12;
}

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

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

.table th {
    background-color: #f8f9fa;
    color: #555;
    font-weight: 600;
}

.table tr:hover {
    background-color: #f1f4f6;
}

.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}
.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}
.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Login Page Specific */
.login-page {
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #2c3e50, #3498db);
}
.login-box {
    width: 400px;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}
.login-box h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #2c3e50;
}