/* ==========================================
   艾艾车擎 AICAR Engine - 官方网站样式
   ========================================== */

/* ==========================================
   CSS Variables - Design Tokens
   ========================================== */
:root {
    /* Primary Colors */
    --color-primary: #00D4FF;
    --color-primary-dark: #00A3CC;
    --color-primary-light: #33DDFF;
    --color-primary-glow: rgba(0, 212, 255, 0.3);
    
    /* Accent Colors */
    --color-accent: #FF6B35;
    --color-accent-dark: #E55A2B;
    --color-accent-light: #FF8A5C;
    --color-accent-glow: rgba(255, 107, 53, 0.3);
    
    /* Success/Data Colors */
    --color-success: #00FF88;
    --color-success-glow: rgba(0, 255, 136, 0.3);
    
    /* Background Colors */
    --color-bg-dark: #0A0E17;
    --color-bg-medium: #0F1420;
    --color-bg-light: #1A1F2E;
    --color-bg-card: #151A28;
    --color-bg-card-hover: #1E2436;
    
    /* Text Colors */
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #94A3B8;
    --color-text-muted: #64748B;
    
    /* Border Colors */
    --color-border: rgba(148, 163, 184, 0.1);
    --color-border-light: rgba(148, 163, 184, 0.2);
    
    /* Typography */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-6xl: 4.5rem;
    
    /* 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: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow-primary: 0 0 30px var(--color-primary-glow);
    --shadow-glow-accent: 0 0 30px var(--color-accent-glow);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-tooltip: 500;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-dark);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    border: none;
    outline: none;
    background: none;
}

button {
    cursor: pointer;
}

/* ==========================================
   Utility Classes
   ========================================== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==========================================
   Navigation
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    padding: var(--spacing-lg) 0;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    padding: var(--spacing-md) 0;
    background: rgba(10, 14, 23, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.logo-icon {
    font-size: var(--font-size-2xl);
    filter: drop-shadow(0 0 10px var(--color-primary));
}

.logo-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-text-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
}

.nav-links a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

.nav-cta {
    padding: var(--spacing-sm) var(--spacing-lg) !important;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-full);
    color: var(--color-bg-dark) !important;
    font-weight: 600 !important;
}

.nav-cta:hover {
    box-shadow: var(--shadow-glow-primary);
    transform: translateY(-2px);
}

.nav-cta::after {
    display: none !important;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

/* ==========================================
   Buttons
   ========================================== */
.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: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-bg-dark);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow-primary), var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-primary);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-light);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-full {
    width: 100%;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -2;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.6;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(10, 14, 23, 0.3) 0%,
        rgba(10, 14, 23, 0.6) 50%,
        rgba(10, 14, 23, 0.95) 100%
    );
}

.hero-particles {
    position: absolute;
    inset: 0;
    z-index: -1;
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    padding: 0 var(--spacing-xl);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
}

.pulse {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.5);
    }
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-xl);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-2xl);
}

.hero-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    padding: var(--spacing-2xl);
    background: rgba(15, 20, 32, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
}

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

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
}

.stat-suffix {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-text-muted);
    border-bottom: 2px solid var(--color-text-muted);
    transform: rotate(45deg);
}

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

/* ==========================================
   Section Common Styles
   ========================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header.light {
    color: var(--color-text-primary);
}

.section-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

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

/* ==========================================
   Products Section
   ========================================== */
.products {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-medium);
}

.products-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.product-card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.product-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

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

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.product-glow {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-glow) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.product-glow.orange {
    background: linear-gradient(135deg, var(--color-accent-glow) 0%, transparent 50%);
}

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

.product-content {
    padding: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
}

.product-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-primary);
    color: var(--color-bg-dark);
    font-size: var(--font-size-xs);
    font-weight: 700;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-lg);
    width: fit-content;
}

.product-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.product-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.product-features {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.product-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.feature-icon {
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.product-features li div {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.product-features li strong {
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.product-features li span {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.product-features.compact li {
    align-items: center;
}

.product-features.compact li span {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.product-upcoming {
    display: flex;
    flex-direction: column;
}

.product-upcoming .product-image {
    height: 200px;
}

.coming-soon-badge {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-accent);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 700;
    border-radius: var(--radius-full);
    z-index: 10;
}

/* Platform Support */
.platform-support {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2xl);
    padding: var(--spacing-2xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}

.platform-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.platforms {
    display: flex;
    gap: var(--spacing-xl);
}

.platform-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
}

.platform-item.active {
    border-color: var(--color-primary);
    background: rgba(0, 212, 255, 0.1);
}

.platform-icon {
    font-size: var(--font-size-lg);
}

.platform-soon {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding: 2px 6px;
    background: var(--color-bg-dark);
    border-radius: var(--radius-sm);
}

/* ==========================================
   Data Section
   ========================================== */
.data-section {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-medium) 100%);
}

.data-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.data-card {
    padding: var(--spacing-2xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
}

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

.data-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
}

.data-icon.orange {
    background: rgba(255, 107, 53, 0.1);
    color: var(--color-accent);
}

.data-icon.green {
    background: rgba(0, 255, 136, 0.1);
    color: var(--color-success);
}

.data-icon.cyan {
    background: rgba(0, 212, 255, 0.1);
    color: var(--color-primary);
}

.data-icon svg {
    width: 28px;
    height: 28px;
}

.data-value {
    margin-bottom: var(--spacing-md);
}

.data-number {
    font-size: var(--font-size-4xl);
    font-weight: 900;
    color: var(--color-text-primary);
    line-height: 1;
}

.data-suffix {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.data-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.data-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ==========================================
   Technology Section
   ========================================== */
.technology {
    position: relative;
    padding: var(--spacing-4xl) 0;
    overflow: hidden;
}

.tech-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.tech-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
}

.tech-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(10, 14, 23, 0.8) 0%,
        rgba(10, 14, 23, 0.6) 50%,
        rgba(10, 14, 23, 0.9) 100%
    );
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.tech-card {
    position: relative;
    padding: var(--spacing-2xl);
    background: rgba(21, 26, 40, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

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

.tech-number {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: var(--font-size-4xl);
    font-weight: 900;
    color: rgba(0, 212, 255, 0.1);
    line-height: 1;
}

.tech-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.tech-icon svg {
    width: 28px;
    height: 28px;
}

.tech-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.tech-desc {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.tech-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tech-features li {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    color: var(--color-primary);
}

/* ==========================================
   About Section
   ========================================== */
.about {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-medium);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-content .section-tag {
    margin-bottom: var(--spacing-md);
}

.about-content .section-title {
    text-align: left;
    margin-bottom: var(--spacing-xl);
}

.about-text {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

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

.about-founder {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    margin-top: var(--spacing-2xl);
}

.founder-avatar {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-2xl);
    font-weight: 900;
    color: white;
}

.founder-info h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.founder-info p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.about-values {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.value-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.value-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-primary);
}

.value-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

.value-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.value-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ==========================================
   Contact Section
   ========================================== */
.contact {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-dark);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact-info .section-tag {
    margin-bottom: var(--spacing-md);
}

.contact-info .section-title {
    text-align: left;
    margin-bottom: var(--spacing-lg);
}

.contact-desc {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-2xl);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.contact-method:hover {
    border-color: var(--color-primary);
}

.method-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
}

.method-icon.wechat {
    background: rgba(7, 193, 96, 0.1);
    color: #07C160;
}

.method-icon svg {
    width: 24px;
    height: 24px;
}

.method-content h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.method-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.contact-form-wrapper {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
}

.contact-form h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

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

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-note {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-lg);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    background: var(--color-bg-medium);
    border-top: 1px solid var(--color-border);
}

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

.footer-brand .logo {
    margin-bottom: var(--spacing-lg);
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.footer-links h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

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

.footer-legal a {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .product-main {
        grid-template-columns: 1fr;
    }
    
    .product-image {
        height: 250px;
    }
    
    .data-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        padding: var(--spacing-xl);
        background: rgba(10, 14, 23, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--color-border);
        gap: var(--spacing-lg);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        padding: var(--spacing-lg);
    }
    
    .stat-number {
        font-size: var(--font-size-3xl);
    }
    
    .platform-support {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .platforms {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .data-cards {
        grid-template-columns: 1fr;
    }
    
    .about-values {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .product-content {
        padding: var(--spacing-lg);
    }
    
    .contact-form-wrapper {
        padding: var(--spacing-lg);
    }
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

.animate-fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* Stagger animation delays */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }
.stagger-6 { animation-delay: 0.6s; }