:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --background-color: #f8f9fa;
    --border-color: #dee2e6;
    --text-color: #343a40;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 导航栏样式 */
.navbar {
    background-color: white;
    box-shadow: var(--shadow);
    padding: 0.75rem 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 60px;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    font-weight: 500;
    font-size: 0.9rem;
}

.logout-btn {
    color: var(--secondary-color);
    text-decoration: none;
    cursor: pointer;
    font-size: 0.9rem;
}

/* 主要内容区域 */
.main-content {
    margin-top: 70px;
    /* padding: 2rem 0; */
}

/* 表单样式 */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.form-select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    background-color: white;
}

.form-textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    min-height: 100px;
    resize: vertical;
}

/* 按钮样式 */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    border: none;
    transition: background-color 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #0056b3;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #218838;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
}

/* 卡片样式 */
.card {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

/* 网格布局 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* 加载和错误状态 */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--secondary-color);
}

.error-message {
    text-align: center;
    padding: 2rem;
    color: var(--danger-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        padding: 0.5rem 0;
        height: 50px;
    }
    
    .main-content {
        margin-top: 60px;
    }
    
    .logo {
        font-size: 1.2rem;
    }
    
    .user-name,
    .logout-btn {
        font-size: 0.85rem;
    }
    
    .grid {
        grid-template-columns: 1fr;
    }
}