/* ===== CSS变量 ===== */
:root {
    /* 主题色 - 参考DLsite官方配色 */
    --primary-color: #1e3a8a;
    --primary-dark: #1e40af;
    --primary-light: #3b5998;
    --secondary-color: #FDB913;
    --secondary-dark: #F59E0B;
    --secondary-light: #FCD34D;
    
    /* 辅助色 */
    --accent-color: #8B8378;
    --accent-dark: #6D675E;
    --accent-light: #A39A8E;
    
    /* 背景色 - 白色主题 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-light: #f8fafc;
    
    /* 文本色 - 深色文字 */
    --text-primary: #1a1a1a;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --text-dark: #1e293b;
    
    /* 其他颜色 */
    --white: #ffffff;
    --success: #10b981;
    --warning: #FDB913;
    --error: #ef4444;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #3b5998 100%);
    --gradient-secondary: linear-gradient(135deg, #FDB913 0%, #F59E0B 100%);
    --gradient-dark: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
    
    /* 深色导航栏 */
    --nav-bg: #1e3a8a;
    --nav-text: #ffffff;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(30, 58, 138, 0.3);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== 全局样式 ===== */
* {
    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', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    padding: var(--spacing-xs) 0;
    box-shadow: var(--shadow-lg);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    cursor: pointer;
}

.logo i {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--white);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.mobile-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    z-index: 999;
    transform: translateY(-150%);
    opacity: 0;
    transition: var(--transition-normal);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-link {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.mobile-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.mobile-cta {
    width: 100%;
    justify-content: center;
}

/* ===== 按钮样式 ===== */
.cta-button,
.btn-primary {
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: var(--transition-fast);
    box-shadow: var(--shadow-md);
    white-space: nowrap;
}

.cta-button:hover,
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.cta-button:active,
.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    padding: 0.75rem 1.5rem;
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.2rem;
}

/* ===== Hero区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(30, 58, 138, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

.hero-background::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(253, 185, 19, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(50px, 50px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.hero-title-main {
    font-size: 4rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero-title-sub {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-dark);
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

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

.tag {
    padding: 0.5rem 1rem;
    background: rgba(30, 58, 138, 0.08);
    border: 1px solid rgba(30, 58, 138, 0.2);
    border-radius: var(--radius-sm);
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.tag:hover {
    background: rgba(30, 58, 138, 0.12);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* ===== 通用区块样式 ===== */
section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* ===== 平台特色 ===== */
.features {
    background: var(--bg-primary);
}

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

.feature-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid var(--bg-tertiary);
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    background: var(--white);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--white);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== 用户保障 ===== */
.guarantee {
    background: var(--bg-secondary);
}

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

.guarantee-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.guarantee-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--white);
    transition: var(--transition-normal);
}

.guarantee-item:hover .guarantee-icon {
    transform: scale(1.1) rotate(5deg);
}

.guarantee-item h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.guarantee-item p {
    color: var(--text-secondary);
}

/* ===== 会员权益 ===== */
.membership {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 50%, #f8f9fa 100%);
    position: relative;
    overflow: hidden;
}

.membership::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(30, 58, 138, 0.03) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(253, 185, 19, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.membership .container {
    position: relative;
    z-index: 1;
}

.membership-tiers {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.membership-tier {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition-normal);
    border: 2px solid var(--bg-tertiary);
    position: relative;
    display: flex;
    flex-direction: column;
}

.membership-tier:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.tier-featured {
    border-color: var(--secondary-color);
    box-shadow: 0 10px 30px rgba(253, 185, 19, 0.2);
    transform: scale(1.05);
}

.tier-featured:hover {
    transform: scale(1.08) translateY(-10px);
    box-shadow: 0 20px 40px rgba(253, 185, 19, 0.3);
}

.popular-badge {
    position: absolute;
    top: -12px;
    right: var(--spacing-lg);
    background: var(--gradient-secondary);
    color: var(--white);
    padding: 0.4rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
    z-index: 2;
}

.tier-badge {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--white);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.tier-badge-premium {
    background: var(--gradient-secondary);
}

.tier-badge-platinum {
    background: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
}

.membership-tier:hover .tier-badge {
    transform: scale(1.1) rotate(10deg);
}

.tier-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.tier-price {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--bg-tertiary);
}

.price-amount {
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary-color);
    line-height: 1;
}

.tier-featured .price-amount {
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price-period {
    font-size: 1rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

.price-label {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.tier-features {
    list-style: none;
    margin-bottom: var(--spacing-xl);
    flex: 1;
}

.tier-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    text-align: left;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.tier-features i {
    color: var(--secondary-color);
    font-size: 1rem;
    flex-shrink: 0;
}

.tier-features strong {
    color: var(--primary-color);
}

.tier-button {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    width: 100%;
}

.tier-button-basic {
    background: var(--bg-secondary);
    color: var(--text-dark);
    border: 2px solid var(--primary-color);
}

.tier-button-basic:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tier-button-premium {
    background: var(--gradient-secondary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.tier-button-premium:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(253, 185, 19, 0.4);
}

.tier-button-platinum {
    background: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.tier-button-platinum:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(45, 55, 72, 0.4);
}

/* 会员对比表格 */
.membership-comparison {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
}

.membership-comparison h3 {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.comparison-table {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    background: var(--white);
}

.comparison-header {
    background: var(--gradient-primary);
    color: var(--white);
    font-weight: 700;
}

.comparison-cell {
    padding: var(--spacing-md);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60px;
}

.comparison-row:not(.comparison-header) .comparison-cell:first-child {
    text-align: left;
    font-weight: 600;
    color: var(--text-dark);
}

.comparison-cell i.fa-check,
.comparison-cell i.fa-check-double {
    color: var(--secondary-color);
    font-size: 1.2rem;
}

.comparison-cell i.fa-times {
    color: var(--text-tertiary);
    font-size: 1.2rem;
}

.comparison-cell strong {
    color: var(--primary-color);
    font-weight: 700;
}

/* ===== 创作者支持 ===== */
.creator {
    background: var(--bg-secondary);
}

.creator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.creator-card {
    position: relative;
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-normal);
    overflow: hidden;
    border: 1px solid var(--bg-tertiary);
}

.creator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

.creator-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.creator-card:hover::before {
    transform: scaleX(1);
}

.creator-number {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 3rem;
    font-weight: 900;
    color: rgba(30, 58, 138, 0.08);
}

.creator-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
}

.creator-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.creator-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.creator-cta {
    text-align: center;
    background: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
    border: 1px solid var(--bg-tertiary);
}

.creator-cta h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.creator-cta p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ===== 用户评价 ===== */
.testimonials {
    background: var(--bg-primary);
}

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

.testimonial-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
    border: 1px solid var(--bg-tertiary);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-xl);
    background: var(--white);
}

.testimonial-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.testimonial-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
}

.author-info h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.rating {
    display: flex;
    gap: 3px;
}

.rating i {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* ===== 最新文章 ===== */
.articles {
    background: var(--bg-primary);
}

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

.article-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid var(--bg-tertiary);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

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

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.article-card:hover .article-image img {
    transform: scale(1.1);
}

.article-category {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.article-content {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-title {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.article-title a {
    color: var(--text-dark);
    text-decoration: none;
    transition: var(--transition-fast);
}

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

.article-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-tertiary);
    font-size: 0.9rem;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--bg-tertiary);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.article-meta i {
    font-size: 0.85rem;
}

/* ===== 常见问题 ===== */
.faq {
    background: var(--bg-secondary);
}

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

.faq-item {
    background: var(--white);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: var(--transition-fast);
    border: 1px solid var(--bg-tertiary);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    cursor: pointer;
    user-select: none;
}

.faq-question i:first-child {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.faq-question h3 {
    flex: 1;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.faq-toggle {
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
    color: var(--primary-color);
}

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

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    padding-left: calc(var(--spacing-lg) + 1.5rem + var(--spacing-md));
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== CTA区域 ===== */
.cta-section {
    background: var(--gradient-secondary);
    padding: var(--spacing-2xl) 0;
}

.cta-content {
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.cta-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--spacing-xl);
}

.cta-content .btn-primary {
    background: var(--primary-color);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.cta-content .btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    transform: translateY(-3px);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--nav-bg);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    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-brand {
    text-align: left;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--white);
}

.footer-logo i {
    color: var(--secondary-color);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: flex;
    gap: var(--spacing-2xl);
}

.footer-links-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links-group h4 {
    color: var(--white);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.footer-links-group a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.footer-links-group a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

.footer-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.footer-tags span {
    padding: 0.4rem 0.8rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
}

.footer-domain {
    color: var(--secondary-color);
    font-weight: 600;
}

/* ===== 返回顶部按钮 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero-title-main {
        font-size: 3rem;
    }
    
    .hero-title-sub {
        font-size: 1.5rem;
    }
    
    .membership-tiers {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .tier-featured {
        transform: scale(1);
    }
    
    .tier-featured:hover {
        transform: translateY(-10px);
    }
    
    .comparison-row {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
    }
    
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }
    
    .nav-links,
    .cta-button {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title-main {
        font-size: 2.5rem;
    }
    
    .hero-title-sub {
        font-size: 1.3rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-buttons button {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .features-grid,
    .creator-grid,
    .testimonials-grid,
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .membership-tiers {
        grid-template-columns: 1fr;
    }
    
    .comparison-table {
        overflow-x: auto;
    }
    
    .comparison-row {
        grid-template-columns: 1.2fr 0.8fr 0.8fr 0.8fr;
        min-width: 600px;
    }
    
    .comparison-cell {
        padding: var(--spacing-sm);
        font-size: 0.85rem;
        min-height: 50px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-brand {
        text-align: center;
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-lg);
        width: 100%;
    }
    
    .footer-links-group {
        text-align: center;
    }
    
    .footer-tags {
        justify-content: center;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .hero-title-main {
        font-size: 2rem;
    }
    
    .hero-title-sub {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 1.6rem;
    }
    
    .feature-card,
    .creator-card {
        padding: var(--spacing-lg);
    }
}

/* ===== 加载动画 ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}