/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 表单样式 */
.form-container {
    max-width: 400px;
    margin: 50px auto;
    padding: 30px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #4facfe;
    box-shadow: 0 0 0 2px rgba(79, 172, 254, 0.1);
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background-color: #4facfe;
    color: #fff;
}

.btn-primary:hover {
    background-color: #3a96e9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(79, 172, 254, 0.3);
}

.btn-secondary {
    background-color: #6c757d;
    color: #fff;
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(108, 117, 125, 0.3);
}

.btn-danger {
    background-color: #dc3545;
    color: #fff;
}

.btn-danger:hover {
    background-color: #c82333;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(220, 53, 69, 0.3);
}

.btn-block {
    width: 100%;
}

/* 卡片样式 */
.card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-bottom: 20px;
}

/* 导航栏样式 */
.navbar {
    background-color: #4facfe;
    color: #fff;
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 20px;
    font-weight: 700;
    text-decoration: none;
    color: #fff;
}

.navbar-menu {
    display: flex;
    list-style: none;
}

.navbar-menu li {
    margin-left: 20px;
}

.navbar-menu li a {
    text-decoration: none;
    color: #fff;
    font-weight: 500;
    transition: color 0.3s ease;
}

.navbar-menu li a:hover {
    color: #e3f2fd;
}

/* 页脚样式 */
.footer {
    background-color: #333;
    color: #fff;
    padding: 20px 0;
    margin-top: 40px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

/* 加载状态 */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 300px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(79, 172, 254, 0.3);
    border-top: 4px solid #4facfe;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    margin-top: 15px;
    color: #666;
}

/* 错误信息 */
.error-message {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    border: 1px solid #f5c6cb;
}

/* 成功信息 */
.success-message {
    background-color: #d4edda;
    color: #155724;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    border: 1px solid #c3e6cb;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .form-container {
        padding: 20px;
        margin: 30px auto;
    }
    
    .navbar-container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .navbar-menu {
        margin-top: 15px;
    }
    
    .navbar-menu li {
        margin-left: 0;
        margin-right: 15px;
    }
}

/* 网格布局 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

/* 卡片项 */
.card-item {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: transform 0.3s ease;
}

.card-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 15px;
    color: #333;
}

h1 {
    font-size: 28px;
}

h2 {
    font-size: 24px;
}

h3 {
    font-size: 20px;
}

/* 文本样式 */
p {
    margin-bottom: 15px;
}

/* 链接样式 */
a {
    color: #4facfe;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #3a96e9;
    text-decoration: underline;
}

/* 列表样式 */
ul, ol {
    margin-bottom: 15px;
    padding-left: 20px;
}

li {
    margin-bottom: 5px;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

th, td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

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

/* 按钮组 */
.btn-group {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* 头像样式 */
.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: #4facfe;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin-bottom: 20px;
}

/* 表单验证样式 */
.form-group.has-error input,
.form-group.has-error textarea,
.form-group.has-error select {
    border-color: #dc3545;
}

.form-group.has-error .error-text {
    color: #dc3545;
    font-size: 12px;
    margin-top: 5px;
}

/* 面包屑导航 */
.breadcrumb {
    margin-bottom: 20px;
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}

.breadcrumb-item {
    display: inline-block;
    margin-right: 10px;
}

.breadcrumb-item:not(:last-child):after {
    content: '/';
    margin-left: 10px;
    color: #666;
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

.pagination-item {
    margin: 0 5px;
}

.pagination-item a {
    display: block;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #fff;
}

.pagination-item.active a {
    background-color: #4facfe;
    color: #fff;
    border-color: #4facfe;
}

/* 标签样式 */
.tag {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 12px;
    margin-right: 5px;
    margin-bottom: 5px;
}

.tag-primary {
    background-color: #e3f2fd;
    color: #1976d2;
}

.tag-success {
    background-color: #e8f5e8;
    color: #388e3c;
}

.tag-warning {
    background-color: #fff3e0;
    color: #f57c00;
}

.tag-danger {
    background-color: #ffebee;
    color: #d32f2f;
}