/* ===================================
   CSS Variables - 主题颜色系统
   =================================== */
:root {
    /* 主色调 - 清爽蓝色 */
    --primary-color: #4285f4;
    --primary-dark: #1967d2;
    --primary-light: #5e97f6;
    --secondary-color: #4285f4;
    --accent-color: #34a853;
    
    /* 中性色 - 浅色主题 */
    --light-bg: #f8f9fa;
    --light-bg-secondary: #ffffff;
    --light-bg-tertiary: #e8eaed;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-muted: #80868b;
    
    /* 功能色 */
    --success-color: #34a853;
    --warning-color: #fbbc04;
    --error-color: #ea4335;
    
    /* 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: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 8px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px 0 rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 8px 24px 0 rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(66, 133, 244, 0.3);
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===================================
   全局样式重置
   =================================== */
* {
    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;
    background-color: var(--light-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===================================
   容器布局
   =================================== */
.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: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

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

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* ===================================
   按钮样式
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

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

.btn-hero-primary {
    background: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-hero-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(66, 133, 244, 0.3);
}

.btn-hero-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-hero-secondary:hover {
    background: var(--light-bg-tertiary);
    border-color: var(--primary-dark);
    color: var(--primary-dark);
}

.btn-cta {
    background: var(--primary-color);
    color: white;
    padding: 1.25rem 2.5rem;
    font-size: 1.2rem;
}

.btn-cta:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(66, 133, 244, 0.4);
}

.btn-pricing {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    width: 100%;
    justify-content: center;
}

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

.btn-pricing-featured {
    background: var(--primary-color);
    color: white;
    width: 100%;
    justify-content: center;
}

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

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

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--primary-color);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--primary-light);
    bottom: -150px;
    left: -150px;
    animation-delay: 7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--accent-color);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-30px, 30px) scale(0.9);
    }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-2xl) 0;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===================================
   Section 通用样式
   =================================== */
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);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   技术展示区
   =================================== */
.tech-section {
    background: white;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

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

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

.tech-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.tech-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.tech-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===================================
   功能展示区
   =================================== */
.features-section {
    background: var(--light-bg);
}

.feature-block {
    background: white;
    border: 1px solid var(--light-bg-tertiary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.feature-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--light-bg-tertiary);
}

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

.feature-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

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

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

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

.feature-card-icon {
    width: 60px;
    height: 60px;
    background: rgba(66, 133, 244, 0.1);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.feature-card h4 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card ul {
    list-style: none;
}

.feature-card li {
    color: var(--text-secondary);
    padding: 0.4rem 0;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.95rem;
}

.feature-card li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 风格展示 */
.styles-showcase {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--light-bg-tertiary);
}

.styles-title {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

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

.style-tag {
    background: white;
    border: 1px solid var(--light-bg-tertiary);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
}

.style-tag:hover {
    background: rgba(66, 133, 244, 0.05);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.style-tag i {
    color: var(--primary-color);
}

/* ===================================
   创作工具区
   =================================== */
.tools-section {
    background: white;
}

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

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

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

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

.tool-card h3 {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-sm);
}

.tool-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===================================
   应用场景区
   =================================== */
.showcase-section {
    background: var(--light-bg);
}

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

.showcase-card {
    background: white;
    border: 1px solid var(--light-bg-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

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

.showcase-image {
    width: 100px;
    height: 100px;
    background: rgba(66, 133, 244, 0.1);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary-color);
    margin: 0 auto var(--spacing-md);
}

.showcase-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.showcase-card ul {
    list-style: none;
}

.showcase-card li {
    color: var(--text-secondary);
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.showcase-card li i {
    color: var(--success-color);
    flex-shrink: 0;
}

/* ===================================
   会员权益区
   =================================== */
.pricing-section {
    background: white;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    border: 1px solid var(--light-bg-tertiary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
    position: relative;
}

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

.pricing-card.featured {
    border-color: var(--primary-color);
    background: white;
    box-shadow: var(--shadow-md);
}

.featured-badge {
    position: absolute;
    top: -15px;
    right: 30px;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.9rem;
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--light-bg-tertiary);
}

.pricing-header h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.currency {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.amount {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.period {
    font-size: 1.2rem;
    color: var(--text-muted);
}

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

.pricing-features li {
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
}

.pricing-features i {
    color: var(--success-color);
    flex-shrink: 0;
}

/* ===================================
   社区区域
   =================================== */
.community-section {
    background: var(--light-bg);
}

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

.community-card {
    background: white;
    border: 1px solid var(--light-bg-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

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

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

.community-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.community-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===================================
   优势展示区
   =================================== */
.advantages-section {
    background: white;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

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

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

.advantage-icon {
    width: 70px;
    height: 70px;
    background: rgba(66, 133, 244, 0.1);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-color);
    margin: 0 auto var(--spacing-md);
}

.advantage-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.advantage-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

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

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

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

/* ===================================
   页脚
   =================================== */
.footer {
    background: var(--text-primary);
    border-top: 1px solid var(--light-bg-tertiary);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    grid-column: span 1;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: white;
}

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

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-section li i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

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

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* ===================================
   响应式设计
   =================================== */

/* 平板设备 (≤1024px) */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.8rem;
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

/* 移动设备 (≤768px) */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: var(--spacing-xl);
        transition: left var(--transition-normal);
        border-top: 1px solid var(--light-bg-tertiary);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .showcase-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .community-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
}

/* 小型移动设备 (≤480px) */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .feature-block {
        padding: var(--spacing-md);
    }
    
    .feature-header {
        flex-direction: column;
        text-align: center;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}

/* ===================================
   文章资讯模块 - 紧凑优化版
   =================================== */
.articles-section {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
    padding: var(--spacing-xl) 0;
    position: relative;
}

.articles-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--light-bg-tertiary) 20%, 
        var(--light-bg-tertiary) 80%, 
        transparent);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.25rem;
    margin-top: var(--spacing-lg);
}

.article-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    border: 1px solid transparent;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(66, 133, 244, 0.15);
    border-color: rgba(66, 133, 244, 0.2);
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

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

.article-image {
    position: relative;
    height: 140px;
    background: linear-gradient(135deg, 
        rgba(66, 133, 244, 0.03) 0%, 
        rgba(66, 133, 244, 0.08) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.article-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, 
        rgba(66, 133, 244, 0.1) 0%, 
        transparent 60%);
}

.article-image i {
    font-size: 3.2rem !important;
    color: var(--primary-color);
    opacity: 0.85;
    position: relative;
    z-index: 1;
    transition: all var(--transition-normal);
}

.article-card:hover .article-image i {
    transform: scale(1.1);
    opacity: 1;
}

.article-category {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    color: var(--primary-color);
    padding: 0.3rem 0.7rem;
    border-radius: 16px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border: 1px solid rgba(66, 133, 244, 0.2);
    z-index: 2;
}

/* 首页文章卡片内容区域 */
.article-card .article-content {
    padding: 1.25rem;
}

.article-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.4;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.8rem;
}

.article-title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
    background: linear-gradient(to right, var(--primary-color), var(--primary-color)) no-repeat;
    background-size: 0% 2px;
    background-position: left bottom;
    transition: background-size var(--transition-normal);
}

.article-title a:hover {
    color: var(--primary-color);
    background-size: 100% 2px;
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    height: 2.8rem;
}

/* 首页文章卡片元信息 */
.article-card .article-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--light-bg-tertiary);
}

.article-card .article-meta-left {
    display: flex;
    gap: 1rem;
}

.article-card .article-meta span {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 500;
}

.article-card .article-meta i {
    color: var(--primary-color);
    font-size: 0.85rem;
}

.article-card .article-read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    color: var(--primary-color);
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    transition: gap var(--transition-fast);
}

.article-card .article-read-more:hover {
    gap: 0.5rem;
}

.article-card .article-read-more i {
    font-size: 0.75rem;
}

/* 响应式优化 */
@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .articles-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .article-image {
        height: 160px;
    }
    
    .article-image i {
        font-size: 3.5rem !important;
    }
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.article-meta i {
    color: var(--primary-color);
}


/* ===================================
   文章详情页 - 全新设计
   =================================== */
.article-detail {
    background: var(--light-bg);
    padding-top: 80px;
    min-height: 100vh;
}

.article-detail-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-md);
}

/* 文章头部 */
.article-detail-header {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--light-bg-tertiary);
    position: relative;
    overflow: hidden;
}

.article-detail-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
}

.article-detail-header .article-category {
    display: inline-flex;
    align-items: center;
    background: rgba(66, 133, 244, 0.1);
    color: var(--primary-color);
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    margin-bottom: var(--spacing-md);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border: 1px solid rgba(66, 133, 244, 0.2);
}

.article-detail-title {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.article-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--light-bg-tertiary);
}

.article-detail-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.article-detail-meta i {
    color: var(--primary-color);
    font-size: 1rem;
}

/* 文章主体内容 */
.article-detail-body {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--light-bg-tertiary);
    line-height: 1.8;
}

.article-detail-body h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid var(--primary-color);
    position: relative;
}

.article-detail-body h2::before {
    content: '';
    position: absolute;
    left: 0;
    bottom: -3px;
    width: 60px;
    height: 3px;
    background: var(--primary-light);
}

.article-detail-body h2:first-child {
    margin-top: 0;
}

.article-detail-body h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    position: relative;
    padding-left: var(--spacing-sm);
}

.article-detail-body h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 70%;
    background: var(--primary-color);
    border-radius: 2px;
}

.article-detail-body p {
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
}

.article-detail-body ul,
.article-detail-body ol {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.article-detail-body li {
    margin-bottom: 0.75rem;
    font-size: 1.02rem;
    position: relative;
}

.article-detail-body ul li::marker {
    color: var(--primary-color);
}

.article-detail-body ol li::marker {
    color: var(--primary-color);
    font-weight: 600;
}

.article-detail-body strong {
    color: var(--text-primary);
    font-weight: 700;
}

.article-detail-body a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.article-detail-body a:hover {
    border-bottom-color: var(--primary-color);
}

/* 内容盒子样式 */
.article-detail-body .highlight-box {
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.05), rgba(66, 133, 244, 0.02));
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(66, 133, 244, 0.08);
}

.article-detail-body .info-box {
    background: linear-gradient(135deg, rgba(52, 168, 83, 0.05), rgba(52, 168, 83, 0.02));
    border-left: 4px solid var(--success-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(52, 168, 83, 0.08);
}

.article-detail-body .warning-box {
    background: linear-gradient(135deg, rgba(251, 188, 4, 0.05), rgba(251, 188, 4, 0.02));
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(251, 188, 4, 0.08);
}

.article-detail-body .cta-box {
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.08), rgba(66, 133, 244, 0.03));
    padding: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px dashed rgba(66, 133, 244, 0.3);
}

.article-detail-body .cta-box h3 {
    margin: 0 0 var(--spacing-sm) 0;
    padding: 0;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.article-detail-body .cta-box h3::before {
    display: none;
}

.article-detail-body .cta-box p {
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

/* 文章标签 */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--light-bg-tertiary);
}

.article-tag {
    display: inline-flex;
    align-items: center;
    background: rgba(66, 133, 244, 0.08);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    border: 1px solid rgba(66, 133, 244, 0.15);
}

.article-tag:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .article-detail {
        padding-top: 70px;
    }
    
    .article-detail-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .article-detail-header,
    .article-detail-body {
        padding: var(--spacing-lg);
    }
    
    .article-detail-title {
        font-size: 1.75rem;
    }
    
    .article-detail-body h2 {
        font-size: 1.5rem;
    }
    
    .article-detail-body h3 {
        font-size: 1.25rem;
    }
    
    .article-detail-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* ===================================
   按钮CTA样式（白色背景版本）
   =================================== */
.btn-cta.alt {
    background: white;
    color: var(--primary-color);
}

.btn-cta.alt:hover {
    background: var(--light-bg);
    color: var(--primary-dark);
}

/* ===================================
   内容页面样式
   =================================== */
.page-header {
    padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.05), rgba(66, 133, 244, 0.02));
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.page-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.content-section {
    padding: var(--spacing-2xl) 0;
    background: var(--light-bg);
}

/* FAQ 样式 */
.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-category {
    margin-bottom: var(--spacing-2xl);
}

.category-title {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    background: white;
    border: 1px solid var(--light-bg-tertiary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

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

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

.faq-question i:first-child {
    color: var(--primary-color);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.faq-question h3 {
    flex: 1;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.toggle-icon {
    color: var(--text-muted);
    transition: transform var(--transition-normal);
    flex-shrink: 0;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    padding: 0 var(--spacing-md);
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding: 0 var(--spacing-md) var(--spacing-md);
}

.faq-answer p,
.faq-answer ul,
.faq-answer ol {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.faq-answer ul,
.faq-answer ol {
    padding-left: var(--spacing-lg);
}

.faq-answer li {
    margin-bottom: 0.5rem;
}

.faq-answer a {
    color: var(--primary-color);
    text-decoration: none;
}

.faq-answer a:hover {
    text-decoration: underline;
}

/* 帮助卡片 */
.help-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.help-card {
    background: white;
    border: 1px solid var(--light-bg-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.help-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.help-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

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

.help-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.help-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap var(--transition-fast);
}

.help-link:hover {
    gap: 0.75rem;
}

/* 文章详情页内容样式 */
.article-detail-body {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.article-detail-body h2 {
    font-size: 1.8rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--light-bg-tertiary);
}

.article-detail-body h3 {
    font-size: 1.4rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.article-detail-body p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.article-detail-body ul,
.article-detail-body ol {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.article-detail-body li {
    margin-bottom: 0.5rem;
}

.article-detail-body a {
    color: var(--primary-color);
    text-decoration: none;
}

.article-detail-body a:hover {
    text-decoration: underline;
}

.article-detail-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

.article-detail-body .highlight-box {
    background: rgba(66, 133, 244, 0.05);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    border-radius: var(--radius-sm);
}

.article-detail-body .info-box {
    background: rgba(52, 168, 83, 0.05);
    border-left: 4px solid var(--success-color);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    border-radius: var(--radius-sm);
}

.article-detail-body .warning-box {
    background: rgba(251, 188, 4, 0.05);
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    border-radius: var(--radius-sm);
}

.article-detail-meta {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--text-muted);
    border-top: 1px solid var(--light-bg-tertiary);
    margin-top: var(--spacing-xl);
}

/* 内容页面通用样式 - 用于帮助中心、法律条款等页面 */
.content-section .article-content {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--light-bg-tertiary);
    line-height: 1.8;
}

.content-section .article-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid var(--primary-color);
    position: relative;
}

.content-section .article-content h2::before {
    content: '';
    position: absolute;
    left: 0;
    bottom: -3px;
    width: 60px;
    height: 3px;
    background: var(--primary-light);
}

.content-section .article-content h2:first-child {
    margin-top: 0;
}

.content-section .article-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    position: relative;
    padding-left: var(--spacing-sm);
}

.content-section .article-content h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 70%;
    background: var(--primary-color);
    border-radius: 2px;
}

.content-section .article-content p {
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
}

.content-section .article-content ul,
.content-section .article-content ol {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.content-section .article-content li {
    margin-bottom: 0.75rem;
    font-size: 1.02rem;
    position: relative;
}

.content-section .article-content ul li::marker {
    color: var(--primary-color);
}

.content-section .article-content ol li::marker {
    color: var(--primary-color);
    font-weight: 600;
}

.content-section .article-content strong {
    color: var(--text-primary);
    font-weight: 700;
}

.content-section .article-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.content-section .article-content a:hover {
    border-bottom-color: var(--primary-color);
}

.content-section .article-content .highlight-box {
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.05), rgba(66, 133, 244, 0.02));
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(66, 133, 244, 0.08);
}

.content-section .article-content .info-box {
    background: linear-gradient(135deg, rgba(52, 168, 83, 0.05), rgba(52, 168, 83, 0.02));
    border-left: 4px solid var(--success-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(52, 168, 83, 0.08);
}

.content-section .article-content .warning-box {
    background: linear-gradient(135deg, rgba(251, 188, 4, 0.05), rgba(251, 188, 4, 0.02));
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(251, 188, 4, 0.08);
}

.content-section .article-content .cta-box {
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.08), rgba(66, 133, 244, 0.03));
    padding: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px dashed rgba(66, 133, 244, 0.3);
}

.content-section .article-content .cta-box h3 {
    margin: 0 0 var(--spacing-sm) 0;
    padding: 0;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.content-section .article-content .cta-box h3::before {
    display: none;
}

.content-section .article-content .cta-box p {
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .content-section .article-content {
        padding: var(--spacing-lg);
    }
    
    .content-section .article-content h2 {
        font-size: 1.5rem;
    }
    
    .content-section .article-content h3 {
        font-size: 1.25rem;
    }
}

/* 表单样式 */
.form-container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--light-bg-tertiary);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-group .help-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
}

.btn-submit {
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 2rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: white;
    color: var(--text-secondary);
    padding: 0.75rem 2rem;
    border: 1px solid var(--light-bg-tertiary);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

/* ===================================
   打印样式
   =================================== */
@media print {
    .navbar,
    .back-to-top,
    .mobile-menu-toggle,
    .hero-background {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* ===================================
   文章页面响应式
   =================================== */
@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .related-articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }

    .article-detail-title {
        font-size: 2rem;
    }

    .article-detail-body h2 {
        font-size: 1.5rem;
    }

    .article-detail-body h3 {
        font-size: 1.2rem;
    }

    .related-articles-grid {
        grid-template-columns: 1fr;
    }

    .article-detail-container {
        padding: 0 var(--spacing-md);
    }

    .article-detail-header,
    .article-detail-body {
        padding: var(--spacing-lg);
    }
}