/* 全局样式重置和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 - 参考图片的紫色、蓝色、粉色渐变 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --secondary-gradient: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    --accent-gradient: linear-gradient(135deg, #ff9a9e 0%, #fecfef 50%, #fecfef 100%);
    
    /* 中性色 */
    --white: #ffffff;
    --black: #000000;
    --dark-gray: #1a1a1a;
    --light-gray: #f8f9fa;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    
    /* 光效颜色 */
    --glow-primary: rgba(102, 126, 234, 0.3);
    --glow-secondary: rgba(240, 147, 251, 0.3);
    --glow-accent: rgba(255, 154, 158, 0.3);
    
    /* 阴影 */
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.3);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--white);
    overflow-x: hidden;
}

/* 背景光效 */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.holographic-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(102, 126, 234, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(102, 126, 234, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.3;
    animation: grid-move 20s linear infinite;
}

.floating-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
                      radial-gradient(circle at 80% 20%, rgba(240, 147, 251, 0.1) 0%, transparent 50%),
                      radial-gradient(circle at 40% 40%, rgba(255, 154, 158, 0.1) 0%, transparent 50%);
    animation: particle-float 15s ease-in-out infinite;
}

.light-orbs {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.light-orbs::before,
.light-orbs::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: var(--primary-gradient);
    filter: blur(100px);
    opacity: 0.1;
    animation: orb-float 25s ease-in-out infinite;
}

.light-orbs::before {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.light-orbs::after {
    bottom: 10%;
    right: 10%;
    animation-delay: 12.5s;
}

/* 动画定义 */
@keyframes grid-move {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

@keyframes particle-float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.logo-glow {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--white);
    animation: pulse 2s ease-in-out infinite;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width 0.3s ease;
}

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

.nav-cta .btn-primary {
    background: var(--primary-gradient);
    color: var(--white);
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-medium);
}

.nav-cta .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

/* 按钮样式 */
.btn-primary {
    background: var(--primary-gradient);
    color: var(--white);
    border: none;
    padding: 16px 32px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-medium);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid rgba(102, 126, 234, 0.3);
    padding: 16px 32px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    border-color: rgba(102, 126, 234, 0.8);
    background: rgba(102, 126, 234, 0.05);
    transform: translateY(-2px);
}

.btn-large {
    padding: 20px 40px;
    font-size: var(--font-size-lg);
}

/* 英雄区域 */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px var(--spacing-md) var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.title-main {
    display: block;
    font-size: var(--font-size-5xl);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.title-sub {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 600;
    color: var(--text-secondary);
}

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

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

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

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* 聊天界面 */
.hero-visual {
    position: relative;
}

.chat-interface {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-heavy);
    position: relative;
    overflow: hidden;
}

.chat-interface::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0.05;
    z-index: -1;
}

.chat-bubble {
    margin-bottom: var(--spacing-md);
    animation: slideInUp 0.6s ease-out;
}

.chat-bubble:last-child {
    margin-bottom: 0;
}

.ai-message {
    text-align: left;
}

.user-message {
    text-align: right;
}

.message-content {
    display: inline-block;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    max-width: 80%;
    word-wrap: break-word;
}

.ai-message .message-content {
    background: var(--primary-gradient);
    color: var(--white);
    box-shadow: var(--shadow-light);
}

.user-message .message-content {
    background: rgba(102, 126, 234, 0.1);
    color: var(--text-primary);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

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

/* 章节标题 */
.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 功能卡片 */
.features-section {
    padding: var(--spacing-xl) 0;
    background: var(--light-gray);
}

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

.feature-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

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

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.icon-glow {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--white);
    animation: pulse 2s ease-in-out infinite;
}

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

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

/* 平台展示 */
.platforms-section {
    padding: var(--spacing-xl) 0;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.platform-item {
    text-align: center;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    cursor: pointer;
}

.platform-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.platform-logo {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    border-radius: 50%;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    overflow: hidden;
}

.platform-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
    transition: all 0.3s ease;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* 确保图片加载失败时的备用样式 */
.platform-icon:not([src]), 
.platform-icon[src=""],
.platform-icon[src*="error"] {
    display: none;
}

.platform-logo:has(.platform-icon:not([src])),
.platform-logo:has(.platform-icon[src=""]),
.platform-logo:has(.platform-icon[src*="error"]) {
    background: var(--primary-gradient);
    color: var(--white);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.platform-item span {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: var(--spacing-xs);
    text-align: center;
    line-height: 1.2;
}

/* AI能力展示 */
.ai-capabilities-section {
    padding: var(--spacing-xl) 0;
    background: var(--light-gray);
}

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

.capability-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.capability-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--secondary-gradient);
}

.capability-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.capability-icon {
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-md);
    border-radius: 50%;
    background: var(--secondary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.capability-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* 核心优势 */
.advantages-section {
    padding: var(--spacing-xl) 0;
}

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

.advantage-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent-gradient);
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.advantage-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

.advantage-metric {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 数据统计 */
.stats-section {
    padding: var(--spacing-xl) 0;
    background: var(--light-gray);
}

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

.stat-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0.05;
    z-index: -1;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    font-weight: 500;
}

/* 行动召唤 */
.cta-section {
    padding: var(--spacing-xl) 0;
    background: var(--primary-gradient);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
}

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

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

.cta-actions .btn-secondary {
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--white);
}

.cta-actions .btn-secondary:hover {
    border-color: var(--white);
    background: rgba(255, 255, 255, 0.1);
}

/* 页脚 */
.footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

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

.footer-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

.footer-section p,
.footer-section li {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xs);
}

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

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

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

/* 动画 */
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
        flex-direction: column;
        align-items: center;
    }
    
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .title-main {
        font-size: var(--font-size-4xl);
    }
    
    .title-sub {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    /* 移动端平台布局 */
    .platforms-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
        max-width: 400px;
        margin: 0 auto;
    }
    
    /* 移动端隐藏后6个平台 */
    .platform-hidden {
        display: none;
    }
    
    /* 显示展开按钮 */
    .platform-expand-container {
        display: flex;
        justify-content: center;
        align-items: center;
        margin-top: var(--spacing-lg);
        width: 100%;
    }
    
    /* 展开后显示所有平台 */
    .platforms-expanded .platform-hidden {
        display: block;
        animation: fadeInUp 0.5s ease-out;
    }
    
    /* 为隐藏的平台添加延迟动画 */
    .platforms-expanded .platform-hidden:nth-child(7) { animation-delay: 0.1s; }
    .platforms-expanded .platform-hidden:nth-child(8) { animation-delay: 0.2s; }
    .platforms-expanded .platform-hidden:nth-child(9) { animation-delay: 0.3s; }
    .platforms-expanded .platform-hidden:nth-child(10) { animation-delay: 0.4s; }
    .platforms-expanded .platform-hidden:nth-child(11) { animation-delay: 0.5s; }
    .platforms-expanded .platform-hidden:nth-child(12) { animation-delay: 0.6s; }
    
    /* 移动端平台项目间距优化 */
    .platform-item {
        min-height: 160px;
        padding: var(--spacing-sm);
    }
    
    .platform-item span {
        font-size: var(--font-size-xs);
        margin-top: var(--spacing-xs);
    }
}

/* 平台展开功能 - PC端 */
@media (min-width: 769px) {
  .platform-expand-container {
    display: none !important;
  }
  .platform-hidden {
    display: block !important;
  }
}



@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-section {
        padding: 100px var(--spacing-sm) var(--spacing-lg);
    }
    
    .title-main {
        font-size: var(--font-size-3xl);
    }
    
    .title-sub {
        font-size: var(--font-size-xl);
    }
    
    .hero-description {
        font-size: var(--font-size-base);
    }
    
    .btn-large {
        padding: 16px 24px;
        font-size: var(--font-size-base);
    }
    
    /* 移动端平台图标优化 */
    .platform-logo {
        width: 50px;
        height: 50px;
    }
    
    .platform-icon {
        width: 35px;
        height: 35px;
    }
    
    .platforms-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: var(--spacing-md);
    }
}

/* PC端平台图标适中，整体居中 */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
  justify-content: center;
}
.platform-logo {
  width: 110px !important;
  height: 110px !important;
  margin: 0 auto 0.5rem auto;
  border-radius: 50%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.platform-icon {
  width: 80px !important;
  height: 80px !important;
  object-fit: contain;
}

@media (max-width: 768px) {
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 400px;
    gap: 1.2rem;
  }
  .platform-logo {
    width: 90px !important;
    height: 90px !important;
  }
  .platform-icon {
    width: 60px !important;
    height: 60px !important;
  }
}
@media (max-width: 480px) {
  .platforms-grid {
    max-width: 320px;
    gap: 0.7rem;
  }
  .platform-logo {
    width: 70px !important;
    height: 70px !important;
  }
  .platform-icon {
    width: 45px !important;
    height: 45px !important;
  }
}

/* 移动端展开更多平台按钮居中并美化 */
.platform-expand-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 1.5rem;
  width: 100%;
}
#platformExpandBtn {
  background: var(--primary-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%));
  color: #fff;
  border: none;
  border-radius: 24px;
  padding: 12px 32px;
  font-size: 1rem;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(102,126,234,0.10);
  cursor: pointer;
  transition: background 0.3s, box-shadow 0.3s, transform 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
#platformExpandBtn:hover {
  background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
  box-shadow: 0 4px 16px rgba(102,126,234,0.18);
  transform: translateY(-2px) scale(1.04);
}
#platformExpandBtn .expand-icon {
  font-size: 1.2em;
  transition: transform 0.3s;
}
#platformExpandBtn.expanded .expand-icon {
  transform: rotate(180deg);
}