/* 基础样式 */
.admin-container {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 100vh;
    background: #f8f9fa;
}

.sidebar {
    background: #2c3e50;
    padding: 20px;
    position: fixed;
    width: 240px;
    height: 100%;
}

.brand {
    color: white;
    font-size: 1.5rem;
    padding: 20px;
    border-bottom: 1px solid #34495e;
}

.sidebar nav a {
    display: block;
    color: #bdc3c7;
    padding: 12px;
    border-radius: 6px;
    margin: 8px 0;
    transition: all 0.3s;
}

.sidebar nav a:hover {
    background: #34495e;
    color: white;
    text-decoration: none;
}

.sidebar nav a.active {
    background: #3498db;
    color: white;
}

.main-content {
    padding: 30px;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.user-info {
    background: white;
    padding: 8px 15px;
    border-radius: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #2c3e50;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    transition: border-color 0.3s;
}

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

.btn-primary {
    background: #3498db;
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
}

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

.hint {
    color: #7f8c8d;
    font-size: 0.9em;
    margin-top: 8px;
}