/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #007bff;
    --primary-dark: #0056b3;
    --secondary-color: #28a745;
    --accent-color: #ffc107;
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --background-primary: #ffffff;
    --background-secondary: #f8f9fa;
    --background-tertiary: #e9ecef;
    --border-color: #dee2e6;
    --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.2);
    
    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    --font-family-heading: "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1rem;
    
    /* Cache busting - change this value to force CSS reload */
    --cache-version: v1.0.1;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--background-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* Layout Components */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

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

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

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

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.btn-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    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-base);
}

.nav {
    padding: var(--spacing-md) 0;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-base);
}

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

.logo {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-small);
}

.nav-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-xl);
    background: rgba(248, 250, 252, 0.8);
    backdrop-filter: blur(8px);
    border-radius: var(--border-radius-full);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid rgba(59, 130, 246, 0.1);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.08);
}

.nav-link {
    position: relative;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
    font-size: var(--font-size-sm);
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: rgba(59, 130, 246, 0.05);
    transform: translateY(-1px);
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    position: relative;
    overflow: hidden;
}

.btn-outline::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left 0.5s ease;
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

/* Purchase Dropdown */
.purchase-dropdown {
    position: relative;
}

.btn-purchase {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 600;
    font-size: var(--font-size-sm);
    border-radius: var(--border-radius-full);
    transition: all var(--transition-base);
    position: relative;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(16, 185, 129, 0.05) 100%);
    cursor: pointer;
}

.btn-purchase svg {
    transition: transform var(--transition-base);
}

.btn-purchase:hover svg {
    transform: scale(1.1) rotate(5deg);
}

.purchase-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-heavy);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 1000;
}

.purchase-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.purchase-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
    border-bottom: 1px solid var(--border-color);
}

.purchase-option:last-child {
    border-bottom: none;
}

.purchase-option:hover {
    background: var(--background-secondary);
    color: var(--primary-color);
}

.purchase-option svg {
    flex-shrink: 0;
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: calc(70px + var(--spacing-4xl)) 0 var(--spacing-4xl);
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

/* Hero title with gradient - highest specificity */
.hero .hero-content .hero-text .hero-title,
.hero-content .hero-text .hero-title,
.hero-text .hero-title,
.hero-title {
    font-size: var(--font-size-2xl) !important;
    font-weight: 600 !important;
    line-height: var(--line-height-tight) !important;
    margin-bottom: var(--spacing-lg) !important;
    /* Fallback color for browsers that don't support gradient text */
    color: #667eea !important;
    /* Gradient background */
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    background: -webkit-linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    background: -moz-linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    /* Text gradient effect */
    -webkit-background-clip: text !important;
    -moz-background-clip: text !important;
    background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    -moz-text-fill-color: transparent !important;
    /* Ensure the gradient is applied */
    display: inline-block !important;
    position: relative !important;
}

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

.highlight::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* Hero Features */
.hero-features {
    margin: var(--spacing-2xl) 0;
}

.feature-highlight {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.feature-highlight:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.feature-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.feature-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-xs) 0;
}

.feature-content p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
    line-height: var(--line-height-relaxed);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: var(--line-height-relaxed);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

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

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
}

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

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

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-video {
    width: 100%;
    max-width: 750px;
    position: relative;
}

.hero-video iframe {
    width: 100%;
    height: 450px;
    border-radius: 12px;
    box-shadow: var(--shadow-heavy);
    border: none;
}

/* Features Section */
.features {
    padding: var(--spacing-4xl) 0;
    background-color: var(--background-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-2xl);
}

.feature-card {
    background-color: var(--background-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-heavy);
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-xl);
    color: white;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
    stroke-width: 2;
}

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

.feature-description {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

/* Process Section */
.process {
    padding: var(--spacing-4xl) 0;
    background-color: var(--background-secondary);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.step-content {
    flex: 1;
}

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

.step-description {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

/* 限时标签动画 */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

/* Trust Section */
.trust {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.trust-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-4xl);
}

.trust-stat-item {
    text-align: center;
    padding: var(--spacing-2xl);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-medium);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.trust-number {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

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

.trust-testimonials {
    margin-top: var(--spacing-3xl);
}

.trust-testimonials-title {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

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

.testimonial-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-medium);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.testimonial-rating {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: #FFD700;
}

.testimonial-text {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

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

.testimonial-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 600;
    flex-shrink: 0;
}

.testimonial-info {
    flex: 1;
}

.testimonial-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.testimonial-role {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* Cases Section */
.cases {
    padding: var(--spacing-4xl) 0;
    background: var(--background-secondary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.case-item {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: var(--background-primary);
    cursor: pointer;
}

.case-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-heavy);
}

.case-item img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.case-item-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
    padding: var(--spacing-lg);
    color: white;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.case-item-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

.cases-grid .case-item {
    transition: all 0.3s ease;
}

.cases-grid.collapsed .case-item:nth-child(n+11) {
    display: none;
}

.cases-more {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

.cases-more .btn {
    padding: var(--spacing-md) var(--spacing-2xl);
}

#showMoreBtn svg {
    transition: transform 0.3s ease;
}

#showMoreBtn.expanded svg {
    transform: rotate(180deg);
}

/* Customer Service */
.customer-service {
    position: fixed;
    bottom: 80px;
    right: calc((100% - var(--container-max-width)) / 2 + 30px);
    z-index: 999;
}

@media (max-width: 1400px) {
    .customer-service {
        right: 30px;
    }
}

.cs-button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 24px;
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
    color: white;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 6px 25px rgba(255, 107, 107, 0.6);
    transition: all 0.3s ease;
    font-size: 17px;
    font-weight: 700;
    animation: customerServicePulse 2s ease-in-out infinite;
}

@keyframes customerServicePulse {
    0%, 100% {
        box-shadow: 0 6px 25px rgba(255, 107, 107, 0.6);
    }
    50% {
        box-shadow: 0 8px 35px rgba(255, 107, 107, 0.8);
    }
}

.cs-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 30px rgba(255, 107, 107, 0.8);
    animation: none;
}

.cs-icon {
    width: 24px;
    height: 24px;
}

.cs-panel {
    position: absolute;
    bottom: 70px;
    right: 0;
    width: 350px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.cs-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.cs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.cs-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.cs-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    color: var(--text-muted);
    transition: color 0.3s ease;
}

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

.cs-close svg {
    width: 20px;
    height: 20px;
}

.cs-content {
    padding: 20px;
    max-height: 400px;
    overflow-y: auto;
}

.cs-item {
    display: flex;
    gap: 15px;
    padding: 15px;
    background: var(--background-secondary);
    border-radius: 12px;
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

.cs-item:hover {
    transform: translateX(5px);
}

.cs-item:last-child {
    margin-bottom: 0;
}

.cs-item-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 50%;
    color: var(--primary-color);
}

.cs-item-icon svg {
    width: 20px;
    height: 20px;
}

.cs-item-content h4 {
    margin: 0 0 5px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.cs-item-content p {
    margin: 0 0 10px 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.cs-item-btn {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.3s ease;
}

.cs-item-btn:hover {
    background: var(--primary-dark);
}

.cs-qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.cs-qr-modal.active {
    opacity: 1;
    visibility: visible;
}

.cs-qr-content {
    position: relative;
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    max-width: 400px;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.cs-qr-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    color: var(--text-muted);
}

.cs-qr-close:hover {
    color: var(--text-primary);
}

.cs-qr-close svg {
    width: 24px;
    height: 24px;
}

.cs-qr-content h3 {
    margin: 0 0 20px 0;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.cs-qr-placeholder {
    width: 250px;
    height: 250px;
    margin: 0 auto 20px;
    background: var(--background-secondary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cs-qr-placeholder img {
    max-width: 100%;
    max-height: 100%;
    border-radius: 12px;
}

.cs-qr-content p {
    color: var(--text-secondary);
    font-size: 14px;
    margin: 0;
}

/* Download Section */
.download {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-4xl);
    align-items: center;
}

.download-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: white;
}

.download-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
    opacity: 1;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

.download-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.feature-check {
    width: 20px;
    height: 20px;
    stroke-width: 3;
    color: white;
}

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

/* 下载按钮特殊样式 - 增强可见性 */
.download-actions .btn-secondary {
    background-color: white;
    color: var(--primary-color);
    border: 3px solid white;
    font-weight: 700;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.download-actions .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--primary-dark);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.download-info {
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-sm);
    opacity: 0.9;
    color: white;
}

/* Footer */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    max-width: 300px;
}

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

.footer-logo-icon {
    width: 36px;
    height: 36px;
    color: white;
    flex-shrink: 0;
}

.footer-brand-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: white;
}

.footer-logo {
    width: 40px;
    height: 40px;
    margin-bottom: var(--spacing-md);
    filter: brightness(0) invert(1);
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    line-height: var(--line-height-relaxed);
}

.footer-links {
    display: flex;
    gap: var(--spacing-4xl);
}

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

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

.footer-list li {
    margin-bottom: var(--spacing-sm);
}

.footer-list a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
}

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

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

.footer-copyright {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-copyright p {
    margin: 0;
    font-size: var(--font-size-sm);
}

.footer-beian {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
    font-size: var(--font-size-xs);
}

.footer-beian a {
    display: flex;
    align-items: center;
    gap: 4px;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-beian a:hover {
    color: rgba(255, 255, 255, 0.8);
}

.footer-beian .separator {
    color: rgba(255, 255, 255, 0.3);
}

.beian-icon {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mt-0 { margin-top: 0; }

/* Navigation Toggle (Mobile) */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--spacing-sm);
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: var(--transition-base);
    border-radius: 2px;
}

/* Download Modal */
.download-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.download-modal.show {
    opacity: 1;
}

.download-modal.hide {
    opacity: 0;
}

.modal-content {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-large);
    transform: translateY(-20px);
    transition: transform 0.3s ease;
}

.download-modal.show .modal-content {
    transform: translateY(0);
}

.modal-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: white;
    font-size: var(--font-size-2xl);
    font-weight: bold;
}

.modal-content h3 {
    margin: 0 0 var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-xl);
}

.modal-content p {
    margin: 0 0 var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-close {
    background: var(--background-tertiary);
    color: var(--text-secondary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    font-size: var(--font-size-sm);
}

.modal-close:hover {
    background: var(--text-muted);
    color: white;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

.animate-in {
    animation: fadeInUp 0.6s ease-out;
}

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

/* Header Scroll Effect */
.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-medium);
}

/* Active Navigation Link */
.nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 1px;
}