/* 快连全新设计 - 暗色赛博朋克主题 */

:root {
    /* 赛博朋克霓虹色彩系统 */
    --neon-blue: #00f3ff;
    --neon-purple: #9d00ff;
    --neon-pink: #ff00ff;
    --neon-green: #00ff9d;
    --cyber-dark: #0a0a12;
    --cyber-darker: #05050a;
    --cyber-light: #1a1a25;
    --cyber-gray: #2a2a35;
    --cyber-text: #e0e0ff;
    --cyber-subtle: #a0a0c0;
    
    /* 霓虹渐变 */
    --gradient-neon: linear-gradient(135deg, var(--neon-blue), var(--neon-purple), var(--neon-pink));
    --gradient-cyber: linear-gradient(135deg, var(--neon-green), var(--neon-blue));
    --gradient-dark: linear-gradient(135deg, var(--cyber-dark), var(--cyber-darker));
    
    /* 霓虹光晕效果 */
    --glow-blue: 0 0 15px rgba(0, 243, 255, 0.6), 0 0 30px rgba(0, 243, 255, 0.3);
    --glow-purple: 0 0 15px rgba(157, 0, 255, 0.6), 0 0 30px rgba(157, 0, 255, 0.3);
    --glow-green: 0 0 15px rgba(0, 255, 157, 0.6), 0 0 30px rgba(0, 255, 157, 0.3);
    --glow-pink: 0 0 15px rgba(255, 0, 255, 0.6), 0 0 30px rgba(255, 0, 255, 0.3);
    
    /* 科技感阴影 */
    --shadow-tech: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-neon: 0 0 20px var(--neon-blue);
    --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.6);
    
    /* 科技感边框圆角 */
    --radius-tech: 12px;
    --radius-card: 20px;
    --radius-full: 50px;
    
    /* 间距系统 */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-xxl: 64px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Orbitron', 'Rajdhani', 'Segoe UI', 'Courier New', monospace;
    background: var(--cyber-dark);
    color: var(--cyber-text);
    line-height: 1.8;
    overflow-x: hidden;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 赛博朋克风格滚动条 */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--cyber-darker);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-neon);
    border-radius: 6px;
    border: 2px solid var(--cyber-dark);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gradient-cyber);
}

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

/* 导航栏 - 科技感设计 */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: var(--space-sm) 0;
    background: rgba(10, 10, 18, 0.95);
    backdrop-filter: blur(15px) saturate(180%);
    border-bottom: 1px solid var(--neon-blue);
    box-shadow: var(--shadow-tech);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

header.scrolled {
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--neon-purple);
    box-shadow: var(--glow-blue);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo img {
    height: 45px;
    width: auto;
    filter: drop-shadow(var(--glow-blue));
    transition: all 0.3s ease;
}

.logo:hover img {
    transform: rotate(15deg);
    filter: drop-shadow(var(--glow-purple));
}

.logo h1 {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 1px;
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.3);
}

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

.nav-links a {
    color: var(--cyber-text);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    position: relative;
    padding: var(--space-xs) 0;
    letter-spacing: 1px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-transform: uppercase;
}

.nav-links a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--gradient-neon);
    border-radius: 2px;
    transition: width 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--glow-blue);
}

.nav-links a:hover {
    color: var(--neon-blue);
    text-shadow: var(--glow-blue);
    transform: translateY(-3px);
}

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

/* 汉堡菜单按钮（移动端） */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    transition: all 0.3s ease;
}

.hamburger span {
    display: block;
    width: 30px;
    height: 3px;
    background: var(--neon-blue);
    border-radius: 2px;
    transition: all 0.3s ease;
    box-shadow: var(--glow-blue);
}

.hamburger:hover span {
    background: var(--neon-purple);
    box-shadow: var(--glow-purple);
}

/* 赛博朋克风格按钮 */
.cta-button {
    background: var(--gradient-neon);
    color: var(--cyber-dark);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 900;
    font-size: 1.2rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 2px solid transparent;
    cursor: pointer;
    box-shadow: var(--glow-blue);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.cta-button::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 0.6s ease;
}

.cta-button:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: var(--glow-purple);
    color: var(--cyber-darker);
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:active {
    transform: translateY(-2px) scale(1.02);
}

.btn-secondary {
    background: transparent;
    color: var(--neon-blue);
    border: 2px solid var(--neon-blue);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(0, 243, 255, 0.1);
    border-color: var(--neon-purple);
    color: var(--neon-purple);
}

/* 下载页面主按钮 */
.download-main-button {
    padding: var(--space-lg) var(--space-xxl);
    font-size: 1.5rem;
    border-radius: 60px;
    box-shadow: var(--shadow-neon);
    animation: cyber-pulse 2s infinite;
}

.download-main-button:hover {
    transform: translateY(-8px) scale(1.1);
    box-shadow: var(--glow-purple);
}

@keyframes cyber-pulse {
    0% { box-shadow: 0 0 15px var(--neon-blue); }
    50% { box-shadow: 0 0 30px var(--neon-purple); }
    100% { box-shadow: 0 0 15px var(--neon-blue); }
}

/* 首屏 - 科技感全屏设计 */
.hero {
    padding: 200px 0 120px;
    position: relative;
    overflow: hidden;
    background: var(--cyber-darker);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 243, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(157, 0, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 0, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xxl);
    position: relative;
    z-index: 2;
}

.hero-text {
    flex: 1;
}

.hero-text h2 {
    font-size: 4rem;
    margin-bottom: var(--space-md);
    line-height: 1.1;
    font-weight: 900;
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 20px rgba(0, 243, 255, 0.5);
    letter-spacing: 2px;
}

.hero-text p {
    font-size: 1.3rem;
    margin-bottom: var(--space-xl);
    color: var(--cyber-subtle);
    max-width: 700px;
    line-height: 1.8;
    font-weight: 500;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.hero-image {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image img {
    max-width: 90%;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-tech), var(--glow-blue);
    transition: all 0.5s ease;
    filter: brightness(0.9) contrast(1.1);
    animation: float-cyber 8s ease-in-out infinite;
}

.hero-image img:hover {
    transform: scale(1.03) rotate(1deg);
    filter: brightness(1) contrast(1.2);
    box-shadow: var(--shadow-tech), var(--glow-purple);
}

@keyframes float-cyber {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(0.5deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

/* 特性区 - 科技感卡片设计 */
.features {
    padding: var(--space-xxl) 0;
    background: var(--cyber-dark);
    position: relative;
    overflow: hidden;
}

.section-title {
    text-align: center;
    font-size: 3rem;
    margin-bottom: var(--space-xxl);
    position: relative;
    padding-bottom: var(--space-md);
    font-weight: 900;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: var(--gradient-neon);
    border-radius: 2px;
    box-shadow: var(--glow-blue);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.feature-card {
    background: rgba(26, 26, 37, 0.6);
    border-radius: var(--radius-card);
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid var(--cyber-gray);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.1), transparent);
    transition: left 0.6s ease;
}

.feature-card:hover {
    transform: translateY(-15px);
    border-color: var(--neon-blue);
    box-shadow: var(--shadow-card), var(--glow-blue);
}

.feature-card:hover::before {
    left: 100%;
}

.feature-icon {
    font-size: 4rem;
    margin-bottom: var(--space-md);
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    transition: all 0.4s ease;
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
}

.feature-card:hover .feature-icon {
    transform: scale(1.2) rotate(10deg);
    text-shadow: 0 0 20px rgba(0, 243, 255, 0.8);
}

.feature-card h3 {
    font-size: 1.8rem;
    margin-bottom: var(--space-sm);
    color: var(--neon-blue);
    font-weight: 800;
    letter-spacing: 1px;
}

.feature-card p {
    color: var(--cyber-subtle);
    font-size: 1.1rem;
    line-height: 1.7;
    font-weight: 500;
}

/* 统计数据 - 霓虹数字展示 */
.stats {
    padding: var(--space-xxl) 0;
    background: var(--cyber-darker);
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 10% 90%, rgba(0, 255, 157, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 90% 10%, rgba(0, 243, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-xl);
    text-align: center;
}

.stat-item {
    padding: var(--space-xl) var(--space-md);
    position: relative;
}

.stat-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-neon);
    border-radius: 2px;
    box-shadow: var(--glow-blue);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: var(--space-sm);
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.4s ease;
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
}

.stat-number:hover {
    transform: scale(1.1);
    text-shadow: 0 0 20px rgba(0, 243, 255, 0.8);
}

.stat-label {
    font-size: 1.2rem;
    color: var(--cyber-subtle);
    font-weight: 600;
    letter-spacing: 1px;
}

/* 平台支持 - 科技网格 */
.platforms {
    padding: var(--space-xxl) 0;
    background: var(--cyber-dark);
    position: relative;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.platform-card {
    background: rgba(26, 26, 37, 0.6);
    border-radius: var(--radius-card);
    padding: var(--space-xl) var(--space-md);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid var(--cyber-gray);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.1), transparent);
    transition: left 0.6s ease;
}

.platform-card:hover {
    transform: translateY(-12px);
    border-color: var(--neon-blue);
    box-shadow: var(--shadow-card), var(--glow-blue);
}

.platform-card:hover::before {
    left: 100%;
}

.platform-icon {
    font-size: 3.5rem;
    margin-bottom: var(--space-sm);
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.4s ease;
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
}

.platform-card:hover .platform-icon {
    transform: scale(1.3) rotate(15deg);
    text-shadow: 0 0 25px rgba(0, 243, 255, 0.8);
}

.platform-card h3 {
    margin-bottom: var(--space-xs);
    color: var(--neon-blue);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.platform-card p {
    color: var(--cyber-subtle);
    margin-bottom: var(--space-md);
    font-size: 1rem;
    font-weight: 500;
}

/* 评价区 - 霓虹卡片设计 */
.testimonials {
    padding: var(--space-xxl) 0;
    background: var(--cyber-darker);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-xxl);
}

.testimonial-card {
    background: rgba(26, 26, 37, 0.6);
    border-radius: var(--radius-card);
    padding: var(--space-xl);
    border: 1px solid var(--cyber-gray);
    box-shadow: var(--shadow-tech);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.testimonial-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.1), transparent);
    transition: left 0.6s ease;
}

.testimonial-card:hover {
    transform: translateY(-12px);
    border-color: var(--neon-purple);
    box-shadow: var(--shadow-card), var(--glow-purple);
}

.testimonial-card:hover::before {
    left: 100%;
}

.testimonial-text {
    font-style: italic;
    margin-bottom: var(--space-lg);
    color: var(--cyber-text);
    font-size: 1.15rem;
    line-height: 1.8;
    position: relative;
    padding-left: var(--space-md);
}

.testimonial-text::before {
    content: '"';
    position: absolute;
    left: 0;
    top: -10px;
    font-size: 3rem;
    color: var(--neon-blue);
    opacity: 0.5;
}

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

.author-avatar {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    background: var(--gradient-neon);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.4rem;
    color: var(--cyber-darker);
    flex-shrink: 0;
    box-shadow: var(--glow-blue);
}

.author-info h4 {
    margin-bottom: 5px;
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--neon-blue);
    letter-spacing: 1px;
}

.author-info p {
    color: var(--neon-green);
    font-size: 0.95rem;
    font-weight: 600;
}

/* 下载区 - 霓虹按钮设计 */
.download-section {
    padding: var(--space-xxl) 0;
    text-align: center;
    background: var(--cyber-dark);
    position: relative;
    overflow: hidden;
}

.download-section .section-title {
    margin-bottom: var(--space-md);
}

.download-section > p {
    font-size: 1.25rem;
    color: var(--cyber-subtle);
    margin-bottom: var(--space-xxl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
    font-weight: 500;
}

.download-options {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-xl);
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(26, 26, 37, 0.8);
    padding: var(--space-lg) var(--space-md);
    border-radius: 20px;
    text-decoration: none;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid var(--cyber-gray);
    width: 190px;
    box-shadow: var(--shadow-tech);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.15), transparent);
    transition: left 0.6s ease;
}

.download-btn:hover {
    transform: translateY(-15px);
    border-color: var(--neon-blue);
    box-shadow: var(--shadow-card), var(--glow-blue);
}

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

.download-btn i {
    font-size: 3.5rem;
    margin-bottom: var(--space-sm);
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.4s ease;
}

.download-btn:hover i {
    transform: scale(1.3) rotate(10deg);
}

.download-btn span {
    font-weight: 900;
    font-size: 1.3rem;
    color: var(--neon-blue);
    margin-bottom: var(--space-xs);
    letter-spacing: 1px;
}

.download-btn small {
    color: var(--cyber-subtle);
    font-size: 0.9rem;
    font-weight: 500;
}

/* 教程文章区 - 科技感排版 */
.tutorial {
    padding: var(--space-xxl) 0;
    background: var(--cyber-darker);
}

.tutorial-content {
    background: rgba(26, 26, 37, 0.6);
    border-radius: 24px;
    padding: var(--space-xxl) var(--space-xl);
    border: 1px solid var(--cyber-gray);
    box-shadow: var(--shadow-tech);
    backdrop-filter: blur(10px);
}

.tutorial h2 {
    font-size: 2.8rem;
    margin-bottom: var(--space-xl);
    color: var(--neon-green);
    font-weight: 900;
    text-align: center;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-shadow: 0 0 15px rgba(0, 255, 157, 0.5);
}

.tutorial-text {
    line-height: 1.9;
    font-size: 1.15rem;
    color: var(--cyber-text);
    font-weight: 500;
}

.tutorial-text h3 {
    font-size: 1.8rem;
    margin: var(--space-xl) 0 var(--space-md);
    color: var(--neon-blue);
    font-weight: 800;
    letter-spacing: 1px;
    position: relative;
    padding-left: var(--space-md);
}

.tutorial-text h3::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--neon-blue);
    font-size: 1.5rem;
    text-shadow: var(--glow-blue);
}

.tutorial-text ul,
.tutorial-text ol {
    margin: var(--space-md) 0 var(--space-md) var(--space-xl);
}

.tutorial-text li {
    margin-bottom: var(--space-sm);
    position: relative;
    padding-left: var(--space-sm);
}

.tutorial-text ul li::before {
    content: '◈';
    position: absolute;
    left: -20px;
    color: var(--neon-blue);
    font-size: 1rem;
    text-shadow: var(--glow-blue);
}

.highlight {
    background: rgba(0, 243, 255, 0.07);
    padding: var(--space-lg);
    border-radius: 16px;
    border-left: 6px solid var(--neon-blue);
    border: 1px solid rgba(0, 243, 255, 0.2);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.3);
    margin: var(--space-lg) 0;
}

/* 页脚 - 赛博朋克风格 */
footer {
    padding: var(--space-xxl) 0 var(--space-lg);
    background: var(--cyber-darker);
    position: relative;
    overflow: hidden;
    border-top: 1px solid var(--neon-blue);
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--neon-blue), transparent);
    opacity: 0.5;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xxl);
}

.footer-column h3 {
    font-size: 1.6rem;
    margin-bottom: var(--space-md);
    position: relative;
    padding-bottom: var(--space-sm);
    color: var(--neon-blue);
    font-weight: 900;
    letter-spacing: 1px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--gradient-neon);
    border-radius: 2px;
    box-shadow: var(--glow-blue);
}

.footer-column p {
    color: var(--cyber-subtle);
    line-height: 1.7;
    margin-bottom: var(--space-md);
    font-weight: 500;
}

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

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    color: var(--cyber-subtle);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    padding: 4px 0;
    position: relative;
    padding-left: var(--space-md);
    font-weight: 600;
}

.footer-links a::before {
    content: '▷';
    position: absolute;
    left: 0;
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
    color: var(--neon-blue);
}

.footer-links a:hover {
    color: var(--neon-blue);
    transform: translateX(8px);
    text-shadow: var(--glow-blue);
}

.footer-links a:hover::before {
    opacity: 1;
    transform: translateX(0);
}

.social-links {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(26, 26, 37, 0.8);
    color: var(--neon-blue);
    text-decoration: none;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--shadow-tech);
    border: 1px solid var(--cyber-gray);
    font-size: 1.2rem;
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.social-link:hover {
    background: var(--gradient-neon);
    color: var(--cyber-darker);
    transform: translateY(-8px) scale(1.1);
    box-shadow: var(--glow-purple);
}

.social-link:hover::before {
    left: 100%;
}

.copyright {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(0, 243, 255, 0.2);
    color: var(--cyber-subtle);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.copyright a {
    color: var(--neon-green);
    text-decoration: none;
    font-weight: 800;
}

.copyright a:hover {
    text-decoration: underline;
    text-shadow: var(--glow-green);
}

/* 返回顶部按钮 - 赛博朋克风格 */
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 65px;
    height: 65px;
    background: var(--gradient-neon);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyber-darker);
    text-decoration: none;
    box-shadow: var(--glow-blue);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    opacity: 0;
    visibility: hidden;
    transform: translateY(30px) scale(0.8);
    z-index: 100;
    font-weight: 900;
    font-size: 1.3rem;
}

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

.back-to-top:hover {
    transform: translateY(-10px) scale(1.1);
    box-shadow: var(--glow-purple);
    color: var(--cyber-darker);
}

/* 进度条 */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--gradient-neon);
    z-index: 1001;
    transition: width 0.3s ease;
    box-shadow: var(--glow-blue);
}

/* 响应式设计 - 增强移动端体验 */
@media (max-width: 1100px) {
    .hero-text h2 {
        font-size: 3.5rem;
    }
    
    .section-title {
        font-size: 2.8rem;
    }
}

@media (max-width: 900px) {
    header {
        padding: var(--space-xs) 0;
    }
    
    .nav-links {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 18, 0.98);
        backdrop-filter: blur(25px);
        padding: var(--space-xl);
        flex-direction: column;
        gap: var(--space-lg);
        text-align: center;
        box-shadow: var(--shadow-tech);
        border-top: 1px solid var(--neon-blue);
        border-bottom: 1px solid var(--neon-purple);
        z-index: 999;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(9px, 9px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -7px);
    }
    
    .hero {
        padding: 180px 0 100px;
    }
    
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: var(--space-xl);
    }
    
    .hero-text {
        padding-right: 0;
    }
    
    .hero-text h2 {
        font-size: 3rem;
    }
    
    .hero-text p {
        font-size: 1.2rem;
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .features-grid,
    .platform-grid,
    .testimonial-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .tutorial-content {
        padding: var(--space-xl) var(--space-lg);
    }
}

@media (max-width: 600px) {
    .hero-text h2 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .features,
    .platforms,
    .testimonials,
    .tutorial,
    .download-section {
        padding: var(--space-xl) 0;
    }
    
    .feature-card,
    .platform-card,
    .testimonial-card {
        padding: var(--space-lg) var(--space-md);
    }
    
    .tutorial-content {
        padding: var(--space-lg) var(--space-md);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .error-number {
        font-size: 6rem;
    }
    
    .error-title {
        font-size: 2rem;
    }
}

/* 动画类 - 赛博朋克特效 */
.fade-in {
    animation: cyber-fade-in 1.2s ease;
}

@keyframes cyber-fade-in {
    from { opacity: 0; transform: translateY(30px); filter: blur(10px); }
    to { opacity: 1; transform: translateY(0); filter: blur(0); }
}

.slide-in-left {
    animation: cyber-slide-in-left 1s ease;
}

@keyframes cyber-slide-in-left {
    from { opacity: 0; transform: translateX(-60px) skewX(-10deg); }
    to { opacity: 1; transform: translateX(0) skewX(0); }
}

.slide-in-right {
    animation: cyber-slide-in-right 1s ease;
}

@keyframes cyber-slide-in-right {
    from { opacity: 0; transform: translateX(60px) skewX(10deg); }
    to { opacity: 1; transform: translateX(0) skewX(0); }
}

.bounce {
    animation: cyber-bounce 3s infinite;
}

@keyframes cyber-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* 工具类 - 赛博朋克风格 */
.text-gradient {
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass-effect {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(15px) saturate(180%);
    border: 1px solid rgba(0, 243, 255, 0.2);
}

.shadow-effect {
    box-shadow: var(--shadow-tech), var(--glow-blue);
}

.rounded-large {
    border-radius: var(--radius-card);
}

.rounded-extra {
    border-radius: var(--radius-full);
}

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

.mt-20 { margin-top: var(--space-xs); }
.mt-40 { margin-top: var(--space-sm); }
.mt-60 { margin-top: var(--space-md); }
.mt-80 { margin-top: var(--space-lg); }
.mb-20 { margin-bottom: var(--space-xs); }
.mb-40 { margin-bottom: var(--space-sm); }
.mb-60 { margin-bottom: var(--space-md); }
.mb-100 { margin-bottom: var(--space-xl); }