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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f7fa;
}

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

/* 头部样式 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background 0.3s;
}

nav a:hover, nav a.active {
    background: rgba(255,255,255,0.2);
}

/* 主要内容区域 */
main {
    padding: 2rem 0;
}

section {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

h2 {
    color: #667eea;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

/* 统计卡片 */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem;
}

.stat-card {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.stat-card h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 1rem;
    opacity: 0.9;
}

/* 分类网格 */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    padding: 1.5rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    transition: all 0.3s;
}

.category-card:hover {
    border-color: #667eea;
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.2);
}

.category-card h3 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

.category-card p {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: #667eea;
    color: white;
    border-radius: 20px;
    font-size: 0.8rem;
}

/* 特性网格 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.feature-card h3 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

/* 代码块 */
.code-block {
    margin-bottom: 1.5rem;
}

.code-block h3 {
    color: #333;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
}

code {
    font-family: 'Courier New', Courier, monospace;
}

/* 链接网格 */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.link-card {
    display: block;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 10px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.link-card:hover {
    border-color: #667eea;
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.2);
}

.link-card h3 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

/* 技能卡片 */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    padding: 1.5rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    transition: all 0.3s;
}

.skill-card:hover {
    border-color: #667eea;
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.2);
}

.skill-card.collection {
    border-left: 4px solid #764ba2;
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 0.5rem;
}

.skill-header h3 {
    color: #333;
    font-size: 1.2rem;
    flex: 1;
}

.skill-card .category {
    color: #667eea;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.skill-card .description {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.skill-card .sub-skills {
    color: #764ba2;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.skill-card .integrated-skills {
    color: #999;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.skill-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
}

.skill-meta span {
    color: #666;
}

.skill-api {
    color: #999;
    font-size: 0.8rem;
}

.badge.needs-api {
    background: #f56565;
}

.badge.optional-api {
    background: #ed8936;
}

.badge.free {
    background: #48bb78;
}

/* 筛选按钮 */
.filters {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.filter-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 2px solid #e0e0e0;
    background: white;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover {
    border-color: #667eea;
}

.filter-btn.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.category-filters select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
}

/* 页脚 */
footer {
    background: #2d3748;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer a {
    color: #667eea;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* 加载和错误状态 */
.loading {
    text-align: center;
    padding: 3rem;
    color: #999;
    font-size: 1.2rem;
}

.error {
    text-align: center;
    padding: 3rem;
    color: #f56565;
    font-size: 1.2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-grid,
    .feature-grid,
    .link-grid,
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    nav {
        flex-direction: column;
    }
    
    .filter-buttons {
        flex-direction: column;
    }
    
    .filter-btn {
        width: 100%;
    }
}