/* ==========================================
   CSS变量 - 现代简洁配色
   ========================================== */
:root {
    /* 主色调 - 参考截图粉色系 */
    --primary: #FB7299;
    --primary-light: #FFA8C5;
    --primary-dark: #E94C75;
    
    /* 背景色 */
    --bg-white: #FFFFFF;
    --bg-gray: #F8F9FA;
    --bg-light: #FAFBFC;
    
    /* 文字色 */
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --text-light: #999999;
    
    /* 边框 */
    --border-color: #E8E8E8;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 999px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xl) 0;
}

/* ==========================================
   导航栏
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    cursor: pointer;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-cta .btn-primary {
    padding: 10px 24px;
    font-size: 14px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* ==========================================
   按钮样式
   ========================================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(251, 114, 153, 0.3);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 40px;
    font-size: 18px;
}

/* ==========================================
   英雄区域
   ========================================== */
.hero {
    padding: 100px 0 var(--spacing-lg);
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-white) 100%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 42px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.hero-title .highlight {
    color: var(--primary);
}

.hero-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md) 0;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ==========================================
   Section Header
   ========================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

/* ==========================================
   特色功能
   ========================================== */
.features {
    background: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
    border-radius: var(--radius-md);
    font-size: 28px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
}

/* ==========================================
   内容板块
   ========================================== */
.content-sections {
    background: var(--bg-gray);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.content-card {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
}

.content-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.content-icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
    border-radius: var(--radius-md);
    font-size: 24px;
}

.content-info h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.content-info > p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.content-features {
    list-style: none;
    padding: 0;
}

.content-features li {
    font-size: 14px;
    color: var(--text-light);
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
}

.content-features li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* ==========================================
   会员权益
   ========================================== */
.membership {
    background: var(--bg-white);
}

.membership-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.membership-card {
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.membership-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.membership-card.featured {
    border-color: var(--primary);
}

.membership-card.premium {
    background: linear-gradient(180deg, #FFF5F8 0%, var(--bg-white) 100%);
    border-color: var(--primary);
}

.membership-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-gray);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.membership-badge.special {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
}

.membership-badge.vip {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: white;
}

.membership-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.membership-features {
    list-style: none;
    text-align: left;
}

.membership-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) 0;
    font-size: 15px;
    color: var(--text-secondary);
}

.membership-features i {
    color: var(--primary);
    font-size: 12px;
}

/* ==========================================
   FAQ
   ========================================== */
.faq {
    background: var(--bg-gray);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-question i {
    color: var(--primary);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==========================================
   文章资讯
   ========================================== */
.articles {
    background: var(--bg-white);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.article-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.article-image {
    display: block;
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.article-card:hover .article-image img {
    transform: scale(1.05);
}

.article-content {
    padding: var(--spacing-md);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.article-category {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
    font-size: 12px;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.article-date {
    font-size: 13px;
    color: var(--text-light);
}

.article-content h3 {
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.article-content h3 a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    transition: color 0.3s ease;
}

.article-content h3 a:hover {
    color: var(--primary);
}

.article-content > p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.read-more:hover {
    gap: 8px;
    color: var(--primary-dark);
}

.read-more i {
    font-size: 12px;
}

/* ==========================================
   CTA区域
   ========================================== */
.cta {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
}

.cta-content {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.cta-content h2 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    font-size: 18px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

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

.cta-content .btn-primary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
}

/* ==========================================
   页脚
   ========================================== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.footer-info p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.footer-nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.footer-nav-group h4 {
    color: white;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.footer-nav-group a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    padding: 4px 0;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

/* ==========================================
   返回顶部
   ========================================== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

/* ==========================================
   内页样式
   ========================================== */
.page-header {
    padding: 140px 0 var(--spacing-xl);
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-white) 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

/* 文章页面头部 */
.article-header {
    max-width: 800px;
    margin: 0 auto;
}

.article-category-badge {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
    font-size: 14px;
    border-radius: var(--radius-full);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.article-meta-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    color: var(--text-light);
    font-size: 14px;
    margin-top: var(--spacing-sm);
}

.article-meta-info i {
    color: var(--primary);
    margin-right: 4px;
}

/* 文章主体 */
.article-body {
    max-width: 800px;
    margin: 0 auto;
}

.article-cover {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.article-cover img {
    width: 100%;
    height: auto;
    display: block;
}

/* 文章标签 */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg-light);
    color: var(--text-secondary);
    font-size: 13px;
    border-radius: var(--radius-full);
    transition: all 0.3s ease;
}

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

/* 文章操作 */
.article-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.action-btn i {
    font-size: 14px;
}

/* 文章导航 */
.article-nav {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-lg);
    gap: var(--spacing-sm);
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateX(0);
}

.nav-btn:first-child:hover {
    transform: translateX(-4px);
}

.nav-btn:last-child:hover {
    transform: translateX(4px);
}

.page-content {
    padding: var(--spacing-xl) 0;
}

.page-content .container {
    max-width: 900px;
}

/* FAQ分类样式 */
.faq-category {
    margin-bottom: var(--spacing-xl);
}

.faq-category h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.faq-category h2 i {
    color: var(--primary);
}

/* 内容区域文本样式 */
.content-section {
    margin-bottom: var(--spacing-lg);
}

.content-section h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.content-section h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.content-section h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.content-section p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.content-section ul,
.content-section ol {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.content-section li {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.content-section a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.content-section a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.content-section strong {
    font-weight: 600;
    color: var(--text-primary);
}

/* 信息框 */
.info-box {
    background: var(--bg-light);
    border-left: 4px solid var(--primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
}

.info-box p {
    margin-bottom: 0;
}

/* 联系表单 */
.contact-form {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    text-align: center;
}

.form-submit .btn-primary {
    min-width: 200px;
}

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-cta {
        display: none;
    }
    
    .hero {
        padding: 100px 0 var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        gap: var(--spacing-sm);
    }
    
    .stat-item {
        flex: 1;
        min-width: 0;
    }
    
    .stat-number {
        font-size: 28px;
    }
    
    .stat-label {
        font-size: 12px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
        justify-content: center;
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .features-grid,
    .content-grid,
    .membership-grid,
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .content-card {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .footer-nav {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 32px;
        --spacing-xl: 48px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .cta-content h2 {
        font-size: 32px;
    }
}