/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - 扁平化色彩方案 */
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --warning-color: #f39c12;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --gray-color: #7f8c8d;
    --white-color: #ffffff;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --bg-light: #f8f9fa;
    --border-color: #e9ecef;
    
    /* Typography */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    --font-size-xxxl: 48px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.15);
    --shadow-xl: 0 16px 40px rgba(0,0,0,0.15);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.2s ease;
    --transition-slow: all 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-xxxl); }
h2 { font-size: var(--font-size-xxl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    min-width: 120px;
}

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

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

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

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

.btn-block {
    width: 100%;
    display: block;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
}

.navbar {
    padding: var(--spacing-sm) 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    transition: opacity 0.3s ease;
    cursor: pointer;
}

.nav-brand:hover {
    opacity: 0.85;
}

.logo {
    height: 40px;
    width: auto;
    transition: transform 0.3s ease;
}

.nav-brand:hover .logo {
    transform: scale(1.05);
}

.brand-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--dark-color);
}

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

.nav-item {
    white-space: nowrap;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
}

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

.nav-link.register-btn {
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
}

.nav-link.register-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.nav-link.register-btn.active {
    background-color: var(--primary-dark);
    color: var(--white-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--dark-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
}

/* Video Background */
.hero-video-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-bg-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
    z-index: -2;
}

.video-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.6), rgba(118, 75, 162, 0.6));
    z-index: -1;
}

.hero-content {
    width: 100%;
    padding: var(--spacing-xxl) 0;
    position: relative;
    z-index: 1;
}

.hero-content .container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
    text-align: center;
}

.hero-text {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--font-size-xxxl);
    font-weight: 700;
    color: var(--white-color);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--spacing-xl);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

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

/* Feature Blocks Container */
.feature-blocks-container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Feature Block */
.feature-block {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    backdrop-filter: blur(15px);
    border: 2px solid rgba(255, 255, 255, 0.1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    
    /* Initial state - hidden and scaled down */
    opacity: 0;
    transform: translateY(100px) scale(0.8);
}

/* Scroll animation states */
.feature-block.scroll-animate {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.feature-block:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-10px) scale(1.05);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

/* Expandable Feature Blocks */
.feature-block.expandable.expanded {
    grid-column: 1 / -1;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    color: var(--text-dark);
    transform: scale(1);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
}

.feature-block.expandable.expanded .block-content h3,
.feature-block.expandable.expanded .block-content p {
    color: var(--text-dark);
}

.feature-block.expandable.expanded .block-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

/* Expand Trigger */
.expand-trigger {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--white-color);
    transition: all 0.3s ease;
    z-index: 10;
}

.expand-trigger:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.feature-block.expanded .expand-trigger {
    background: var(--primary-color);
    transform: rotate(45deg);
}

/* Expanded Content */
.expanded-content {
    position: relative;
    max-height: 0;
    overflow: hidden;
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    opacity: 0;
    margin-top: 0;
}

.feature-block.expanded .expanded-content {
    max-height: 500px;
    opacity: 1;
    margin-top: var(--spacing-xl);
}

.expanded-inner {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-md);
    transform: translateY(30px);
    transition: all 0.4s ease;
}

.feature-block.expanded .expanded-inner {
    transform: translateY(0);
}

.expanded-inner h4 {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.expanded-inner ul {
    list-style: none;
    text-align: left;
    margin-bottom: var(--spacing-lg);
}

.expanded-inner li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    color: var(--text-dark);
    font-size: 0.9rem;
}

.expanded-inner li i {
    color: var(--secondary-color);
    font-size: 12px;
}

/* Feature Stats */
.feature-stats {
    display: flex;
    justify-content: space-around;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.feature-stats .stat {
    text-align: center;
}

.feature-stats .stat-number,
.feature-stats .stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.feature-stats .stat-label {
    font-size: 0.8rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Block Icon */
.block-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--white-color);
    margin: 0 auto var(--spacing-lg);
    transition: all 0.3s ease;
}

.feature-block:hover .block-icon {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.2));
    transform: scale(1.1) rotate(5deg);
}

/* Block Content */
.block-content h3 {
    color: var(--white-color);
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    transition: all 0.3s ease;
}

.block-content p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
    line-height: 1.5;
    margin: 0;
    transition: all 0.3s ease;
}

.feature-block:hover .block-content h3 {
    color: #ffffff;
}

.feature-block:hover .block-content p {
    color: rgba(255, 255, 255, 0.95);
}

/* Video Controls */
.video-controls {
    position: absolute;
    bottom: 100px;
    right: 30px;
    z-index: 10;
}

.video-toggle {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 50%;
    color: var(--primary-color);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-toggle:hover {
    background: var(--primary-color);
    color: var(--white-color);
    transform: scale(1.1);
}

.video-toggle.paused {
    background: rgba(231, 76, 60, 0.9);
    color: var(--white-color);
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 2;
}

.scroll-indicator {
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.scroll-indicator:hover {
    color: var(--white-color);
    transform: translateY(-2px);
}

.scroll-indicator i {
    display: block;
    margin-top: var(--spacing-xs);
    animation: bounce 2s infinite;
}

/* Sections */
section {
    padding: var(--spacing-xxl) 0;
}

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

.section-title {
    font-size: var(--font-size-xxl);
    color: var(--dark-color);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-light);
}

/* Features Section - QQ Channel Style */
.features.qq-channel-style {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
    color: var(--white-color);
}

.qq-channel-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(102, 126, 234, 0.9) 0%, 
        rgba(118, 75, 162, 0.8) 50%, 
        rgba(240, 147, 251, 0.9) 100%);
    z-index: 1;
}

.qq-channel-style .section-header {
    position: relative;
    z-index: 2;
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.qq-channel-style .section-title {
    color: var(--white-color);
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.highlight-text {
    background: linear-gradient(90deg, #4facfe 0%, #00f2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.qq-channel-style .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.2rem;
}

/* Animated Background Particles */
.features-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.1;
    background-image: 
        radial-gradient(circle at 20% 20%, var(--primary-color) 2px, transparent 2px),
        radial-gradient(circle at 80% 80%, var(--secondary-color) 1px, transparent 1px),
        radial-gradient(circle at 40% 60%, var(--accent-color) 1px, transparent 1px);
    background-size: 50px 50px, 80px 80px, 120px 120px;
    animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
    0% { transform: translateY(0) rotate(0deg); }
    100% { transform: translateY(-100px) rotate(360deg); }
}

/* Features Stats */
.features-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

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

.stat-circle {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-sm);
}

.progress-ring {
    position: relative;
    transform: rotate(-90deg);
}

.progress-ring-background {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 4;
}

.progress-ring-fill {
    fill: none;
    stroke: var(--primary-color);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 188.4;
    stroke-dashoffset: 188.4;
    transition: stroke-dashoffset 2s ease-in-out;
}

.progress-number {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(90deg);
    font-weight: 700;
    font-size: 14px;
    color: var(--primary-color);
}

.stat-label {
    font-size: 12px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    position: relative;
}

.feature-card {
    background-color: var(--white-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(50px) scale(0.9);
}

.feature-card.scroll-animated {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

/* Feature Number */
.feature-number {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    opacity: 0;
    transform: scale(0);
    transition: all 0.5s ease;
    z-index: 2;
}

.feature-card.scroll-animated .feature-number {
    opacity: 1;
    transform: scale(1);
    transition-delay: 0.3s;
}

/* Feature Icon */
.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--white-color);
    z-index: 2;
}

.feature-icon i {
    position: relative;
    z-index: 3;
    transition: all 0.5s ease;
}

.icon-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    transform: scale(0);
    transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.feature-card.scroll-animated .icon-bg {
    transform: scale(1);
    transition-delay: 0.1s;
}

.feature-card:hover .icon-bg {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: scale(1.1) rotate(10deg);
}

.feature-card:hover .feature-icon i {
    transform: scale(1.2) rotate(-10deg);
}

/* Feature Content */
.feature-title {
    font-size: var(--font-size-xl);
    color: var(--dark-color);
    margin-bottom: var(--spacing-sm);
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.5s ease;
}

.feature-card.scroll-animated .feature-title {
    transform: translateY(0);
    opacity: 1;
    transition-delay: 0.2s;
}

.feature-description {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.5s ease;
}

.feature-card.scroll-animated .feature-description {
    transform: translateY(0);
    opacity: 1;
    transition-delay: 0.3s;
}

/* Feature Progress */
.feature-progress {
    margin-top: var(--spacing-md);
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.5s ease;
}

.feature-card.scroll-animated .feature-progress {
    transform: translateY(0);
    opacity: 1;
    transition-delay: 0.4s;
}

.progress-bar {
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
    width: 0%;
    transition: width 1.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transform: translateX(-100%);
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    font-size: 12px;
    color: var(--text-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-value {
    font-weight: 700;
    color: var(--primary-color);
}

/* Feature Hover Overlay */
.feature-hover-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.95), rgba(46, 204, 113, 0.95));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.3s ease;
    border-radius: var(--radius-lg);
}

.feature-card:hover .feature-hover-overlay {
    opacity: 1;
}

.hover-text {
    color: var(--white-color);
    font-weight: 600;
    font-size: var(--font-size-lg);
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.feature-card:hover .hover-text {
    transform: translateY(0);
}

/* Scroll Reveal Animations */
.scroll-reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger Animation */
.scroll-stagger .scroll-trigger {
    transition-delay: calc(var(--stagger-delay, 0) * 0.1s);
}

/* 3D Transform Effects */
.feature-card {
    perspective: 1000px;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: translateX(-100%) skewX(-15deg);
    transition: transform 0.6s ease;
}

.feature-card:hover::before {
    transform: translateX(100%) skewX(-15deg);
}

/* Product Showcase */
.product-showcase {
    position: relative;
    /* 背景改为透明，继承页面整体背景 */
    background-color: transparent;
    color: var(--text-dark);
}

.product-showcase .parallax-bg {
    /* 关闭产品展示区的暗色视差背景，避免出现底色 */
    display: none;
}

.showcase-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

 .showcase-text h2 {
    color: var(--dark-color);
    margin-bottom: var(--spacing-md);
 }
 
 .showcase-text p {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
 }

.showcase-features {
    margin-bottom: var(--spacing-lg);
}

.showcase-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.showcase-feature i {
    color: var(--secondary-color);
    font-size: 18px;
}

/* Image Carousel */
.image-carousel {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
    background: transparent;
}

.carousel-container {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    /* 完全去掉阴影和底色，避免出现深色背景条 */
    box-shadow: none;
    background: transparent;
}

.carousel-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.carousel-slide {
    min-width: 100%;
    position: relative;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-slide img {
    width: 100%;
    height: auto;
    display: block;
}

.slide-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: var(--white-color);
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
    text-align: left;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.carousel-slide.active .slide-caption {
    transform: translateY(0);
}

.slide-caption h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--white-color);
}

.slide-caption p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

/* Carousel Controls */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(0, 0, 0, 0.6);
    border: none;
    border-radius: 50%;
    color: var(--white-color);
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    opacity: 0;
    visibility: hidden;
}

.image-carousel:hover .carousel-btn {
    opacity: 1;
    visibility: visible;
}

.carousel-prev {
    left: 15px;
}

.carousel-next {
    right: 15px;
}

.carousel-btn:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn:active {
    transform: translateY(-50%) scale(0.95);
}

/* Carousel Indicators */
.carousel-indicators {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.5);
    background: transparent;
    cursor: pointer;
    transition: all 0.3s ease;
}

.indicator.active,
.indicator:hover {
    background: var(--white-color);
    border-color: var(--white-color);
    transform: scale(1.2);
}

/* Touch/Swipe Support */
.carousel-container {
    touch-action: pan-y;
    user-select: none;
}

/* Showcase Image - Updated */
.showcase-image {
    position: relative;
}

.showcase-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
}

/* Statistics Section */
.statistics {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white-color);
}

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

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

.stat-number {
    font-size: var(--font-size-xxxl);
    font-weight: 700;
    color: var(--white-color);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
}

/* Testimonials Section */
.testimonials {
    background-color: var(--bg-light);
}

.testimonials-slider {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.testimonial-card {
    display: none;
    background-color: var(--white-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.testimonial-card.active {
    display: block;
}

.testimonial-content p {
    font-size: var(--font-size-lg);
    color: var(--text-dark);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
    line-height: 1.8;
}

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

.testimonial-author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.author-info h4 {
    color: var(--dark-color);
    margin-bottom: 2px;
}

.author-info span {
    color: var(--text-light);
    font-size: 14px;
}

.testimonial-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active,
.dot:hover {
    background-color: var(--primary-color);
}

/* Pricing Section */
.pricing {
    text-align: center;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-card {
    background-color: var(--white-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl, 0 16px 40px rgba(0,0,0,0.15));
    border-color: var(--primary-color);
}

.pricing-card.popular {
    border-color: var(--primary-color);
    border-width: 3px;
    transform: scale(1.05);
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-8px);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-md);
}

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

.pricing-header {
    margin-bottom: var(--spacing-lg);
}

.pricing-header h3 {
    font-size: var(--font-size-xl);
    color: var(--dark-color);
    margin-bottom: var(--spacing-md);
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.currency {
    font-size: var(--font-size-lg);
    color: var(--text-light);
}

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

.period {
    font-size: var(--font-size-base);
    color: var(--text-light);
}

.pricing-features {
    margin-bottom: var(--spacing-xl);
}

.pricing-features ul {
    list-style: none;
    text-align: left;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.pricing-features i {
    color: var(--secondary-color);
    font-size: 16px;
}

.pricing-features .fa-times {
    color: var(--gray-color);
}

.pricing-features li:has(.fa-times) {
    color: var(--gray-color);
    opacity: 0.6;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 60px;
    margin-bottom: var(--spacing-xl);
    align-items: start;
}

.footer-section {
    display: flex;
    flex-direction: column;
}

.footer-section:nth-child(2) {
    padding-left: 20px;
}

.footer-section h4 {
    color: #ffffff;
    margin-bottom: 16px;
    font-size: 16px;
    font-weight: 600;
}

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

.footer-logo {
    height: 32px;
    width: auto;
}

.footer-description {
    color: #ffffff;
    margin-bottom: var(--spacing-md);
    font-size: 13px;
    line-height: 1.6;
}

/* QR Codes in Footer */
.qr-codes {
    display: flex;
    gap: 16px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.qr-code-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.qr-code-item img {
    width: 75px;
    height: 75px;
    background: white;
    padding: 5px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.qr-code-item img:hover {
    transform: scale(1.08);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.qr-code-item span {
    font-size: 12px;
    color: #ffffff;
    text-align: center;
    white-space: nowrap;
}

/* Old Social Links (kept for backward compatibility) */
.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white-color);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition);
}

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

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #ffffff;
    text-decoration: none;
    transition: var(--transition);
    font-size: 13px;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: 12px;
    color: #ffffff;
    font-size: 13px;
}

.contact-info i {
    color: var(--primary-color);
    width: 16px;
    font-size: 14px;
}

/* Friendly Links Section */
.footer-links-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-links-title {
    color: var(--white-color);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.friendly-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
}

.friendly-links a {
    color: #ffffff;
    opacity: 0.85;
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 13px;
}

.friendly-links a:hover {
    color: #ffffff;
    opacity: 1;
    border-color: var(--primary-color);
    background-color: rgba(52, 152, 219, 0.1);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.footer-copyright {
    text-align: center;
    color: #ffffff;
    opacity: 0.8;
}

.footer-copyright p {
    margin-bottom: var(--spacing-xs);
    font-size: 13px;
}

/* ICP备案号样式 */
.icp-info {
    display: inline-block;
}

.icp-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    border-radius: 4px;
}

.icp-link:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.icp-link i {
    font-size: 12px;
    opacity: 0.7;
}

.icp-link img {
    width: 16px;
    height: 16px;
    margin-right: 5px;
    vertical-align: middle;
}

.icp-link:hover i {
    opacity: 1;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--white-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

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

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background-color: var(--white-color);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-md);
        transition: var(--transition);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    /* Hero Section Mobile */
    .hero-content .container {
        min-height: 70vh;
    }
    
    .hero-title {
        font-size: var(--font-size-xxl);
    }
    
    /* Mobile Video Background */
    .hero-bg-video {
        object-position: center center;
    }
    
    .video-bg-overlay {
        background: linear-gradient(135deg, rgba(102, 126, 234, 0.7), rgba(118, 75, 162, 0.7));
    }
    
    /* Feature Blocks Mobile Responsive */
    .feature-blocks-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .feature-block {
        padding: var(--spacing-lg);
    }
    
    .block-icon {
        width: 60px;
        height: 60px;
        font-size: 24px;
    }
    
    .block-content h3 {
        font-size: 1.2rem;
    }
    
    .block-content p {
        font-size: 0.9rem;
    }
    
    .qq-channel-style .section-title {
        font-size: 2.5rem;
    }
    
    .feature-block:hover {
        transform: translateY(-5px) scale(1.02);
    }
    
    /* Video Controls Mobile */
    .video-controls {
        bottom: 80px;
        right: 20px;
    }
    
    .video-toggle {
        width: 50px;
        height: 50px;
        font-size: 16px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .showcase-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .qr-codes {
        justify-content: center;
        gap: 20px;
    }
    
    /* Pricing Mobile */
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .pricing-card.popular {
        transform: none;
    }
    
    .pricing-card.popular:hover {
        transform: translateY(-5px);
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    /* Features Stats Mobile */
    .features-stats {
        gap: var(--spacing-md);
        margin: var(--spacing-md) 0;
    }
    
    .features-stats .stat-item {
        margin-bottom: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-xl);
    }
    
    .section-title {
        font-size: var(--font-size-xl);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: var(--font-size-xxl);
    }
    
    .qr-codes {
        gap: 12px;
    }
    
    .qr-code-item img {
        width: 70px;
        height: 70px;
    }
    
    .qr-code-item span {
        font-size: 11px;
    }
}