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

:root {
    /* Colors - High-tech premium palette */
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-bg-dark: #1d1d1f;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-text-dark: #ffffff;
    --color-accent: #00d4ff;
    --color-accent-hover: #00b8e6;
    --color-accent-secondary: #7c3aed;
    --color-accent-green: #22c55e;
    --color-border: rgba(0, 0, 0, 0.1);
    --color-border-dark: rgba(255, 255, 255, 0.1);
    --color-gradient-start: #0a0e27;
    --color-gradient-end: #1a1f35;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-size-base: 17px;
    --font-size-lg: 21px;
    --font-size-xl: 28px;
    --font-size-xxl: 48px;
    --font-size-hero: 56px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.47059;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
}

/* Ensure text is always visible with high contrast */
.section-title {
    color: #1d1d1f !important;
}

.section-subtitle {
    color: #515154 !important;
}

.product-name,
.intro-block h2,
.guideline-item h4,
.ingredient-block h3,
.effect-item h4,
.platform-name {
    color: #000000 !important;
    font-weight: 700 !important;
}

.product-subtitle,
.product-details h4,
.product-details p,
.intro-block p,
.guideline-item p {
    color: #515154 !important;
}

.effect-item p {
    color: #1d1d1f !important;
}

.ingredient-block p {
    color: #1d1d1f !important;
    font-weight: 400;
}

.platform-name {
    color: #000000 !important;
    font-weight: 700 !important;
}

.product-details p,
.intro-block p,
.guideline-item p {
    color: #515154 !important;
    line-height: 1.6;
}

.effect-item p {
    color: #1d1d1f !important;
    line-height: 1.6;
}

.ingredient-block p {
    color: #1d1d1f !important;
    line-height: 1.7;
    font-weight: 400;
}

/* Ensure all text elements have proper contrast */
body,
p,
span,
div,
h1,
h2,
h3,
h4,
h5,
h6 {
    color: #1d1d1f;
}

.section-subtitle,
.product-subtitle,
.intro-block p,
.guideline-item p {
    color: #515154;
}

.effect-item p {
    color: #1d1d1f !important;
}

.ingredient-block p {
    color: #1d1d1f !important;
}

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

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background-color var(--transition-base);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    padding: 0 var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

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

.nav-menu {
    flex: 1;
    display: flex;
    justify-content: center;
    min-width: 0;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 17px;
    font-weight: 500;
    letter-spacing: -0.01em;
    transition: color var(--transition-fast);
    position: relative;
    padding: 10px 20px;
    display: block;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link.active {
    color: var(--color-accent);
    font-weight: 600;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-fast);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-shrink: 0;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid var(--color-border);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    color: var(--color-text);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.lang-toggle:hover {
    background-color: rgba(0, 0, 0, 0.08);
    border-color: var(--color-accent);
}

.lang-icon {
    font-size: 16px;
}

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

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: saturate(180%) blur(20px);
        border-bottom: 1px solid var(--color-border);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }
    
    .nav-menu.active {
        max-height: 300px;
    }
    
    .nav-list {
        flex-direction: column;
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-sm);
    }
    
    .nav-toggle {
        display: flex;
    }
}

/* Main */
.main {
    position: relative;
    z-index: 1;
}

/* Sections */
.section {
    padding: var(--spacing-xl) 0;
    min-height: 45vh;
}

@media (max-width: 768px) {
    .section {
        padding: var(--spacing-lg) 0;
    }
}

.section-title {
    font-size: var(--font-size-xxl);
    font-weight: 600;
    letter-spacing: -0.003em;
    text-align: center;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent-green), var(--color-accent));
    border-radius: 2px;
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
}

@media (max-width: 768px) {
    .section-title {
        font-size: var(--font-size-xl);
    }
    
    .section-subtitle {
        font-size: var(--font-size-base);
    }
}

/* Home Section */
.home {
    padding-top: calc(60px + var(--spacing-md));
    background-color: #ffffff;
    background-image: url('images/bg_home.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
    overflow: hidden;
}

/* Add overlay to ensure text readability */
.home::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.88);
    z-index: 0;
    pointer-events: none;
}

.home .gradient-overlay {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 140%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(34, 197, 94, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 212, 255, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.05) 0%, transparent 60%);
    pointer-events: none;
    z-index: 1;
    animation: float 20s ease-in-out infinite;
}

.home::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(45deg, transparent 48%, rgba(34, 197, 94, 0.02) 49%, rgba(34, 197, 94, 0.02) 51%, transparent 52%),
        linear-gradient(-45deg, transparent 48%, rgba(0, 212, 255, 0.02) 49%, rgba(0, 212, 255, 0.02) 51%, transparent 52%);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 1;
    opacity: 0.3;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(30px, -30px) rotate(2deg);
    }
    66% {
        transform: translate(-20px, 20px) rotate(-2deg);
    }
}

.home-container {
    width: 100%;
}

.home-content {
    max-width: 980px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 2;
    background: rgba(255, 255, 255, 0.98);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.home-content h1,
.home-content h2,
.home-content p {
    color: #1d1d1f !important;
}

.home-title {
    font-size: var(--font-size-hero);
    font-weight: 700;
    letter-spacing: -0.003em;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, #1d1d1f 0%, var(--color-accent-green) 50%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.07143;
}

.home-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
    line-height: 1.42859;
    position: relative;
    z-index: 1;
}

.home-intro {
    text-align: left;
    margin-top: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.intro-block {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    border-radius: 20px;
    position: relative;
    overflow: hidden;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.intro-block:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.intro-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.15;
    z-index: 0;
    pointer-events: none;
}

.intro-block-brand::before {
    background-image: url('images/bg_brand.png');
}

.intro-block-company::before {
    background-image: url('images/bg_company.png');
}

.intro-block h2,
.intro-block p {
    position: relative;
    z-index: 1;
}

.intro-block h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: #000000 !important;
}

.intro-block p {
    font-size: var(--font-size-lg);
    line-height: 1.6;
    color: #1d1d1f !important;
}

/* Patents & Certifications - same level as 公司介绍 */
.intro-block-patents > p {
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: #1d1d1f !important;
}

.intro-block-patents .patents-grid {
    margin-top: var(--spacing-sm);
}

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

.patent-item {
    background-color: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.patent-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

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

@media (max-width: 768px) {
    .patents-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 768px) {
    .home-title {
        font-size: var(--font-size-xxl);
    }
    
    .home-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .intro-block h2 {
        font-size: var(--font-size-lg);
    }
    
    .intro-block p {
        font-size: var(--font-size-base);
    }
}

/* Products Section */
.products {
    background-color: #ffffff;
    position: relative;
    z-index: 1;
    padding-top: calc(60px + var(--spacing-md));
    min-height: 100vh;
}

.products .container {
    position: relative;
    z-index: 1;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.product-card {
    background-color: #ffffff;
    border-radius: 18px;
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    border: 1px solid var(--color-border);
    position: relative;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

/* Ensure product card content has solid white background */
.product-card .product-content {
    background-color: #ffffff !important;
    padding: var(--spacing-md);
    min-height: 180px;
}

.product-details {
    background-color: #ffffff !important;
    padding: 0;
}

.product-details h4 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    color: #1d1d1f !important;
}

.product-details p {
    margin-bottom: var(--spacing-md);
    word-wrap: break-word;
    overflow-wrap: break-word;
    color: #515154 !important;
    line-height: 1.6;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent-green), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(34, 197, 94, 0.15);
    border-color: rgba(34, 197, 94, 0.3);
}

.product-card:hover::before {
    opacity: 1;
}

.product-image {
    width: 100%;
    height: 360px;
    background: linear-gradient(135deg, rgba(248, 249, 250, 1) 0%, rgba(241, 245, 249, 1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.product-image::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(34, 197, 94, 0.08) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.product-card:hover .product-image::after {
    opacity: 1;
}

.product-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.product-content {
    padding: var(--spacing-md);
    background-color: #ffffff !important;
    min-height: 180px;
}

.product-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: #1d1d1f !important;
}

.product-subtitle {
    font-size: var(--font-size-base);
    color: #515154 !important;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.product-details h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    color: #1d1d1f !important;
}

.product-details p {
    font-size: var(--font-size-base);
    color: #515154 !important;
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

@media (max-width: 768px) {
    .products-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .product-image {
        height: 280px;
    }
}

/* Usage Guidelines */
.usage-guidelines {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: #ffffff !important;
    border-radius: 18px;
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1;
}

.guidelines-title {
    color: #1d1d1f !important;
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.guidelines-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.guideline-item p {
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-align: justify;
}

.guideline-item {
    padding: var(--spacing-md);
    background-color: #ffffff !important;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    margin-bottom: var(--spacing-sm);
}

.guideline-item:hover {
    border-color: rgba(34, 197, 94, 0.3);
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.1);
}

.guideline-item h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: #1d1d1f !important;
}

.guideline-item p {
    font-size: var(--font-size-base);
    color: #515154 !important;
    line-height: 1.6;
}

/* Ingredient Section */
.ingredient {
    background-color: var(--color-bg);
    background-image: url('images/bg_ingredient_tech.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    position: relative;
    z-index: 1;
    min-height: 100vh;
    padding-top: calc(60px + var(--spacing-md));
}

.ingredient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.96);
    pointer-events: none;
    z-index: 0;
}

.ingredient-hero-image {
    max-width: 980px;
    margin: var(--spacing-lg) auto var(--spacing-lg);
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--spacing-md);
    background-color: #ffffff !important;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.core-egt-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    display: block;
    margin: 0 auto;
}

.ingredient .container {
    position: relative;
    z-index: 2;
}

.ingredient .section-title {
    color: #000000 !important;
    font-weight: 700 !important;
    background-color: transparent !important;
    text-shadow: none !important;
    position: relative;
    z-index: 3;
}

.ingredient .section-subtitle {
    color: #000000 !important;
    font-size: 1.1rem !important;
    font-weight: 600 !important;
    background-color: transparent !important;
    text-shadow: none !important;
    position: relative;
    z-index: 3;
    margin-bottom: var(--spacing-lg) !important;
    line-height: 1.6 !important;
}

.ingredient-content {
    max-width: 980px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    padding: var(--spacing-lg) 0;
}

.ingredient-block p {
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-align: justify;
}

.effect-item p {
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-align: justify;
}

.ingredient-block {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: #ffffff !important;
    border-radius: 18px;
    border: 1px solid var(--color-border);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    position: relative;
    z-index: 1;
}

.ingredient-block h3 {
    color: #000000 !important;
    font-weight: 700 !important;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    background-color: #ffffff !important;
    padding: var(--spacing-xs) 0;
    text-shadow: none;
}

.ingredient-block p {
    color: #1d1d1f !important;
    font-weight: 400;
    font-size: var(--font-size-lg);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
    background-color: #ffffff !important;
    text-shadow: none;
}

/* Removed duplicate definitions - using complete definition below */

.ingredient-block:hover {
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 8px 32px rgba(0, 212, 255, 0.1);
}

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

.effect-item {
    padding: var(--spacing-lg);
    background-color: #ffffff !important;
    border-radius: 12px;
    border: 2px solid rgba(0, 0, 0, 0.15);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    margin-bottom: var(--spacing-sm);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    position: relative;
    z-index: 1;
}

.effect-item:hover {
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 2px 8px rgba(0, 212, 255, 0.1);
}

.effect-item h4 {
    font-size: var(--font-size-lg) !important;
    font-weight: 700 !important;
    margin-bottom: var(--spacing-sm) !important;
    margin-top: 0 !important;
    color: #000000 !important;
    background-color: #ffffff !important;
    padding: var(--spacing-xs) 0 !important;
    text-shadow: none !important;
    position: relative !important;
    z-index: 2 !important;
}

.effect-item p {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: #1d1d1f !important;
    position: relative;
    z-index: 2;
    background-color: #ffffff !important;
}

@media (max-width: 768px) {
    .ingredient-block {
        padding: var(--spacing-md);
    }
    
    .ingredient-block h3 {
        font-size: var(--font-size-lg);
    }
    
    .ingredient-block p {
        font-size: var(--font-size-base);
    }
}

/* Purchase Section */
.purchase {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 50%, #f0f4f8 100%);
    position: relative;
    z-index: 1;
    padding-top: calc(60px + var(--spacing-md));
    min-height: 100vh;
    overflow: hidden;
}

.purchase::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(34, 197, 94, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 212, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.purchase .container {
    position: relative;
    z-index: 1;
}

.purchase .section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, #000000 0%, #1d1d1f 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.purchase .section-subtitle {
    font-size: 1rem;
    color: #515154;
    margin-bottom: var(--spacing-lg);
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.platform-card {
    background: linear-gradient(135deg, #ffffff 0%, #fafbfc 100%);
    border-radius: 20px;
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid rgba(0, 0, 0, 0.08);
    position: relative;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    z-index: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    min-height: 500px;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #22c55e, #00d4ff, #22c55e);
    background-size: 200% 100%;
    opacity: 0;
    transition: all 0.4s ease;
    border-radius: 24px 24px 0 0;
    animation: gradient-shift 3s ease infinite;
}

.platform-card::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(34, 197, 94, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.platform-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgba(34, 197, 94, 0.2);
    border-color: rgba(34, 197, 94, 0.4);
}

.platform-card:hover::before {
    opacity: 1;
}

.platform-card:hover::after {
    opacity: 1;
}

@keyframes gradient-shift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.platform-logo {
    margin-bottom: var(--spacing-xs);
}

.platform-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 14px;
    font-size: 12px;
    font-weight: 700;
    color: #ffffff;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.platform-card:hover .platform-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.platform-icon.tmall {
    background: linear-gradient(135deg, #ff5000, #ff6a00);
    box-shadow: 0 4px 12px rgba(255, 80, 0, 0.3);
}

.platform-icon.jd {
    background: linear-gradient(135deg, #e1251b, #c41e16);
    box-shadow: 0 4px 12px rgba(225, 37, 27, 0.3);
}

.platform-icon.douyin {
    background: linear-gradient(135deg, #000000, #333333);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.platform-icon.amazon {
    background: linear-gradient(135deg, #ff9900, #ff8800);
    box-shadow: 0 4px 12px rgba(255, 153, 0, 0.3);
}

.platform-name {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    color: #000000 !important;
    background: transparent !important;
    padding: 0;
    text-shadow: none;
    letter-spacing: 0.5px;
}

.platform-image {
    width: 100%;
    height: 340px;
    margin: var(--spacing-md) auto;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    position: relative;
}

.platform-card:hover .platform-image {
    background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
    border-color: rgba(34, 197, 94, 0.2);
    box-shadow: 0 4px 16px rgba(34, 197, 94, 0.1);
}

.platform-image img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 8px;
    transition: transform 0.3s ease;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    image-rendering: high-quality;
    display: block;
    margin: 0 auto;
}

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

.platform-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: var(--spacing-sm);
    padding: 10px 24px;
    background: linear-gradient(135deg, #22c55e 0%, #00d4ff 100%);
    color: #ffffff;
    text-decoration: none;
    border-radius: 22px;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 16px rgba(34, 197, 94, 0.3);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.platform-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.platform-link:hover {
    background: linear-gradient(135deg, #16a34a 0%, #00b8d4 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(34, 197, 94, 0.4);
}

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

@media (max-width: 768px) {
    .platforms-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        max-width: 100%;
        padding: 0 var(--spacing-sm);
    }
    
    .platform-card {
        padding: var(--spacing-md);
        min-height: auto;
    }
    
    .platform-image {
        height: 300px;
        padding: var(--spacing-md);
    }
    
    .platform-name {
        font-size: 1.1rem;
    }
    
    .purchase .section-title {
        font-size: 2rem;
    }
}

/* Product image - click to play video */
.product-image-video {
    cursor: pointer;
}
.product-image-video::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 56px;
    height: 56px;
    margin: -28px 0 0 -28px;
    background: rgba(0, 0, 0, 0.6) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M8 5v14l11-7z'/%3E%3C/svg%3E") center/28px no-repeat;
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}
.product-image-video:hover::after {
    opacity: 1;
}

/* 购买页：平台产品图点击播放视频 */
.platform-image-video {
    cursor: pointer;
}
.platform-image-video::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 48px;
    height: 48px;
    margin: -24px 0 0 -24px;
    background: rgba(0, 0, 0, 0.55) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M8 5v14l11-7z'/%3E%3C/svg%3E") center/24px no-repeat;
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}
.platform-image-video:hover::after {
    opacity: 1;
}

/* Video Modal - 小窗口刚好播放视频 */
.video-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}
.video-modal.is-open {
    opacity: 1;
    visibility: visible;
}
.video-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    cursor: pointer;
}
.video-modal-window {
    position: relative;
    width: 90vw;
    max-width: 720px;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    z-index: 1;
}
.video-modal-close {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: background 0.2s ease;
}
.video-modal-close:hover {
    background: rgba(0, 0, 0, 0.85);
}
.video-modal-player {
    display: block;
    width: 100%;
    height: auto;
    max-height: 80vh;
    vertical-align: top;
}

/* Footer */
.footer {
    background-color: #1d1d1f;
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    z-index: 1;
}

.footer-text {
    color: rgba(255, 255, 255, 0.8);
}

.footer-icp {
    color: rgba(255, 255, 255, 0.6);
}

.footer-text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.footer-icp {
    font-size: 12px;
    color: var(--color-text-secondary);
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    color: var(--color-bg);
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(0, 212, 255, 0.4);
    transition: all var(--transition-fast);
    z-index: 999;
}

.back-to-top:hover {
    background: linear-gradient(135deg, var(--color-accent-hover) 0%, var(--color-accent-secondary) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.5);
}

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

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

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