/* 基础样式 */
:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --accent: #4895ef;
    --light: #f8f9fa;
    --dark: #212529;
    --success: #4cc9f0;
    --warning: #f72585;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7ff;
    color: var(--dark);
    overflow-x: hidden;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 15px 5%;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    padding: 10px 5%;
    background: rgba(255, 255, 255, 0.98);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary);
    margin-left: 10px;
}

.logo-icon {
    font-size: 2rem;
    color: var(--accent);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin: 0 15px;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    /*font-weight: 600;*/
    font-size: 1.1rem;
    transition: color 0.3s;
    position: relative;
    padding: 5px 0;
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--primary);
    transition: width 0.3s;
    border-radius: 2px;
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a.active {
    color: var(--primary);
}

.nav-links a.active::after {
    width: 100%;
}

/* 主内容区域 */
.section {
    min-height: 100vh;
    padding: 100px 10% 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--dark);
    margin-bottom: 15px;
}

.section-title p {
    font-size: 1.1rem;
    color: #666;
    max-width: 700px;
    margin: 0 auto;
}

/* 顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--secondary);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(67, 97, 238, 0.4);
}

/* 页脚样式 */
footer {
    background: var(--dark);
    color: white;
    padding: 60px 10% 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
    max-width: 1400px;
    margin: 0 auto 40px;
}

.footer-column h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #bbb;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    text-decoration: none;
}

.social-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #333;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.social-icon:hover {
    background: var(--primary);
    transform: translateY(-5px);
}

/* 微信二维码悬浮效果 */
.wechat-qrcode {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 140px;
    height: 160px;
    background: white;
    border-radius: 10px;
    padding: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.wechat-hover:hover .wechat-qrcode {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-10px);
}

.qrcode-image {
    width: 120px;
    height: 120px;
    background: #f0f2f5;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    overflow: hidden;
}

.qrcode-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.qrcode-text {
    font-size: 12px;
    color: #333;
    text-align: center;
    font-weight: 500;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #444;
    color: #999;
    font-size: 0.9rem;
    max-width: 1400px;
    margin: 0 auto;
}

.copyright a {
    text-decoration: none;
    color: #999;
}

/* 文章内容样式 */
.content-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.article-content {
    line-height: 1.8;
    font-size: 1.1rem;
    color: #333;
}

.article-content h2,
.article-content h3 {
    margin: 30px 0 20px;
    color: var(--dark);
}

.article-content p {
    margin-bottom: 20px;
}

.article-content img {
    max-width: 100%;
    border-radius: 10px;
    margin: 20px 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.article-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 10px 20px;
    margin: 20px 0;
    background: #f9f9ff;
    font-style: italic;
    color: #555;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .nav-links {
        margin: 20px 0;
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 15px;
    }

    .nav-container {
        flex-direction: column;
    }

    .section {
        padding: 100px 5% 60px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}