/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 颜色主题 */
    --primary-color: #4a90e2;
    --secondary-color: #7b68ee;
    --accent-color: #f39c12;
    --dark-bg: #0a0e27;
    --darker-bg: #050812;
    --card-bg: #1a1f3a;
    --text-primary: #ffffff;
    --text-secondary: #b8c1ec;
    --text-muted: #6c7293;
    --border-color: #2a2f4a;
    --success-color: #27ae60;
    --warning-color: #f39c12;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-dark: linear-gradient(180deg, #0a0e27 0%, #1a1f3a 100%);

    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.3);

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.nav-menu a:hover {
    color: var(--primary-color);
    background: rgba(74, 144, 226, 0.1);
}

#lang-switch {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.nav-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* 主横幅 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 50%, #2a2f4a 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(74, 144, 226, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(123, 104, 238, 0.1) 0%, transparent 50%);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><circle cx="100" cy="100" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="300" cy="200" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="500" cy="150" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="700" cy="300" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="900" cy="100" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="1100" cy="250" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: var(--spacing-xl) 0;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.title-main {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sub {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--text-secondary);
    font-weight: 600;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.hero-description {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.8;
}

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

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator i {
    font-size: 2rem;
    color: var(--text-muted);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-20px);
    }
    60% {
        transform: translateX(-50%) translateY(-10px);
    }
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

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

/* 通用节标题 */
.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
}

/* 功能特性 */
.features {
    padding: var(--spacing-xl) 0;
    background: var(--gradient-dark);
}

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

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

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

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

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* 性能展示 */
.performance {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

.performance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

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

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

.perf-time {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

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

.perf-time {
    color: var(--primary-color);
}

.perf-label {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.perf-desc {
    color: var(--text-secondary);
}

.device-support {
    margin-top: var(--spacing-lg);
    text-align: center;
}

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

.devices {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.device-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.device-item i {
    color: var(--success-color);
    font-size: 1.5rem;
}

/* 下载区域 */
.download {
    padding: var(--spacing-xl) 0;
    background: var(--gradient-dark);
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.download-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-normal);
}

.download-card.featured {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.2);
}

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

.download-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.download-header i {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.download-header h3 {
    font-size: 1.8rem;
    flex: 1;
}

.badge {
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
}

.badge-beta {
    background: var(--warning-color);
}

.download-info {
    margin-bottom: var(--spacing-md);
}

.download-info p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.download-info strong {
    color: var(--text-primary);
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.download-note {
    color: var(--text-muted);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.download-instructions {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.download-instructions h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.instruction-item h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

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

/* 安装步骤 */
.install-steps {
    margin-top: var(--spacing-lg);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.install-steps h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.step {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
}

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

.step p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 系统要求 */
.system-requirements {
    margin-top: var(--spacing-lg);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.system-requirements h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.req-column {
    background: rgba(255, 255, 255, 0.02);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.req-column.recommended {
    border-color: var(--primary-color);
    background: rgba(74, 144, 226, 0.05);
}

.req-column h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.req-column ul {
    list-style: none;
}

.req-column li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    padding-left: 1.5rem;
    position: relative;
}

.req-column li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
}

/* 版本特点 */
.version-features {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.version-features h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

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

.version-features li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.6;
}

.version-features li::before {
    position: absolute;
    left: 0;
    font-size: 1rem;
}

/* 使用指南 */
.guide {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

.guide-steps {
    margin-top: var(--spacing-lg);
}

.guide-step {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    transition: var(--transition-normal);
}

.guide-step:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.guide-step-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.guide-step-number {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: var(--radius-md);
}

.guide-step h3 {
    font-size: 1.8rem;
    color: var(--text-primary);
}

.guide-step-content p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.guide-tips {
    background: rgba(74, 144, 226, 0.1);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
    margin-top: var(--spacing-sm);
}

.guide-tips strong {
    color: var(--primary-color);
}

.guide-tips ul {
    margin-top: var(--spacing-xs);
    margin-left: var(--spacing-md);
}

.guide-tips li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* Photoshop 集成 */
.ps-integration {
    margin-top: var(--spacing-lg);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.ps-integration h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.ps-integration > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.ps-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.ps-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
}

.ps-feature i {
    color: var(--success-color);
}

/* 效果展示 */
.gallery {
    padding: var(--spacing-xl) 0;
    background: var(--gradient-dark);
}

.gallery-grid {
    margin-top: var(--spacing-lg);
}

.gallery-item {
    margin-bottom: var(--spacing-lg);
}

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

.gallery-image {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.gallery-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition-slow);
}

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

.gallery-label {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.gallery-item h4 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

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

.gallery-note {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
}

.gallery-note i {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    display: block;
}

.gallery-note p {
    color: var(--text-secondary);
}

.gallery-note .small-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* Featured Comparison */
.featured-comparison {
    margin-top: var(--spacing-lg);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.comparison-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 0;
}

.comparison-image {
    position: relative;
    overflow: hidden;
}

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

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

.comparison-label {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: rgba(10, 14, 39, 0.9);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.comparison-info {
    padding: var(--spacing-lg);
    text-align: center;
}

.comparison-info h3 {
    color: var(--text-primary);
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
}

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

/* Gallery Showcase */
.gallery-showcase {
    margin-top: var(--spacing-xl);
}

.showcase-title {
    color: var(--text-primary);
    font-size: 2rem;
    text-align: center;
    margin-bottom: var(--spacing-xs);
}

.showcase-subtitle {
    color: var(--text-muted);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* Thumbnail Grid */
.thumbnail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.thumbnail-item {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
}

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

.thumbnail-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.thumbnail-overlay i {
    color: white;
    font-size: 2rem;
}

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

.thumbnail-item:hover img {
    transform: scale(1.1);
}

.thumbnail-item:hover .thumbnail-overlay {
    opacity: 1;
}

.gallery-note-text {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.gallery-note-text i {
    color: var(--primary-color);
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    animation: lightboxZoom 0.3s ease;
}

@keyframes lightboxZoom {
    from {
        transform: scale(0.7);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.lightbox-close {
    position: absolute;
    top: 2rem;
    right: 3rem;
    color: white;
    font-size: 3rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition-fast);
}

.lightbox-close:hover {
    color: var(--primary-color);
}

.lightbox-caption {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    background: rgba(0, 0, 0, 0.7);
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-size: 1.2rem;
    text-align: center;
}

/* FAQ */
.faq {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

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

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: var(--transition-normal);
}

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

.faq-item h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.2rem;
}

.faq-item h3 i {
    color: var(--primary-color);
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

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

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

/* 联系我们 */
.contact {
    padding: var(--spacing-xl) 0;
    background: var(--gradient-dark);
}

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

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

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

.contact-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    display: block;
}

.contact-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* 页脚 */
.footer {
    background: var(--darker-bg);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

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

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

.footer-bottom .fas.fa-heart {
    color: #e74c3c;
}

.footer-bottom a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer-note {
    margin-top: var(--spacing-xs);
    font-size: 0.9rem;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
    z-index: 999;
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-5px);
}

.back-to-top.show {
    display: flex;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 14, 39, 0.98);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: block;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    .features-grid,
    .performance-grid,
    .download-options,
    .steps-grid,
    .requirements-grid,
    .faq-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .gallery-comparison {
        grid-template-columns: 1fr;
    }

    .thumbnail-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .comparison-container {
        grid-template-columns: 1fr;
    }

    .lightbox-close {
        top: 1rem;
        right: 1.5rem;
        font-size: 2.5rem;
    }

    .lightbox-caption {
        bottom: 1rem;
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
        max-width: 90%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero {
        min-height: 80vh;
    }

    .section-title {
        font-size: 2rem;
    }

    .feature-card,
    .download-card,
    .guide-step,
    .faq-item,
    .contact-card {
        padding: var(--spacing-md);
    }
}