/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9fbfd;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
header {
    background-color: #007aff;
    color: #fff;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header .logo h1 {
    font-size: 24px;
    font-weight: 600;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover, nav a.active {
    color: #fff;
}

/* 主视觉区 */
.hero {
    background: linear-gradient(135deg, #e0f0ff 0%, #f9fbfd 100%);
    padding: 80px 0;
    text-align: center;
}

.hero h2 {
    font-size: 36px;
    color: #111;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    color: #555;
    max-width: 800px;
    margin: 0 auto 40px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
}

.btn-primary {
    background-color: #007aff;
    color: #fff;
    box-shadow: 0 4px 15px rgba(0,122,255,0.3);
}

.btn-primary:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: #fff;
    color: #007aff;
    border: 2px solid #007aff;
    margin-left: 15px;
}

.btn-secondary:hover {
    background-color: #f0f8ff;
}

/* 功能区 */
.features {
    padding: 60px 0;
    background-color: #fff;
}

.features h2 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 50px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-item {
    padding: 30px;
    background: #f9fbfd;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #007aff;
}

/* SEO内容区 */
.seo-content {
    padding: 60px 0;
}

.seo-content h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

.seo-content p {
    margin-bottom: 15px;
    font-size: 16px;
    color: #444;
}

/* 内页文章样式 */
.page-content {
    padding: 50px 0;
    background: #fff;
}

article h1 {
    font-size: 32px;
    margin-bottom: 30px;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}

article h2 {
    font-size: 24px;
    margin: 30px 0 15px;
    color: #007aff;
}

article p {
    margin-bottom: 15px;
    font-size: 16px;
}

article ol {
    margin-left: 20px;
    margin-bottom: 20px;
}

article li {
    margin-bottom: 10px;
}

.back-link {
    margin-top: 40px;
}

/* 页脚 */
footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 40px 0 20px;
    text-align: center;
}

.footer-links {
    margin-bottom: 20px;
    border-bottom: 1px solid #34495e;
    padding-bottom: 20px;
}

.friend-links {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 10px;
}

.friend-links a {
    color: #bdc3c7;
    text-decoration: none;
}

.friend-links a:hover {
    color: #fff;
}