/* =============================================
   Hotxin AI Portal - 科技感深色主题
   ============================================= */

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #141925;
    --bg-card: rgba(20, 25, 37, 0.8);
    
    --accent-cyan: #00d4ff;
    --accent-purple: #7c3aed;
    --accent-pink: #f472b6;
    --accent-green: #34d399;
    --accent-orange: #fbbf24;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    --glow-cyan: 0 0 30px rgba(0, 212, 255, 0.3);
    --glow-purple: 0 0 30px rgba(124, 58, 237, 0.3);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =============================================
   导航栏
   ============================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 24px;
    filter: drop-shadow(0 0 8px var(--accent-cyan));
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
}

.logo-accent {
    color: var(--accent-cyan);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    margin: 5px 0;
    transition: all 0.3s;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 0;
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-cyan);
}

/* =============================================
   Hero 区域
   ============================================= */
.hero {
    position: relative;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

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

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

.glow {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.glow-1 {
    top: 20%;
    left: 10%;
    background: var(--accent-cyan);
    animation: float1 8s ease-in-out infinite;
}

.glow-2 {
    bottom: 20%;
    right: 10%;
    background: var(--accent-purple);
    animation: float2 10s ease-in-out infinite;
}

@keyframes float1 {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

@keyframes float2 {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-40px, 20px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: white;
    text-decoration: none;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all 0.3s;
    box-shadow: var(--glow-cyan);
}

.hero-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
}

/* =============================================
   区块通用样式
   ============================================= */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--accent-cyan);
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 12px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* =============================================
   产品矩阵
   ============================================= */
.products {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.product-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s;
}

.product-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-cyan);
    box-shadow: var(--glow-cyan);
}

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

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 20px;
}

.card-icon svg {
    width: 100%;
    height: 100%;
}

.product-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.product-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.card-link {
    color: var(--accent-cyan);
    font-size: 0.85rem;
    font-weight: 500;
}

/* =============================================
   AI 实验室入口
   ============================================= */
.lab-preview {
    padding: 80px 0;
}

.lab-card {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s;
}

.lab-card:hover {
    border-color: var(--accent-purple);
    box-shadow: var(--glow-purple);
}

.lab-thumb {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.play-icon {
    font-size: 32px;
    color: var(--accent-cyan);
}

.lab-info {
    flex: 1;
}

.lab-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.lab-info p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.lab-tags {
    display: flex;
    gap: 8px;
}

.lab-tags span {
    padding: 4px 12px;
    background: var(--glass-bg);
    border-radius: 16px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.lab-arrow {
    font-size: 24px;
    color: var(--accent-purple);
    transition: transform 0.3s;
}

.lab-card:hover .lab-arrow {
    transform: translateX(8px);
}

/* =============================================
   实验室页面
   ============================================= */
.lab-hero {
    padding: 120px 0 60px;
    background: var(--bg-secondary);
}

.lab-hero .back-link {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 24px;
    transition: color 0.2s;
}

.lab-hero .back-link:hover {
    color: var(--accent-cyan);
}

.lab-hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: 12px;
}

.lab-hero p {
    color: var(--text-secondary);
}

.lab-list {
    padding: 60px 0 80px;
}

.demo-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    margin-bottom: 48px;
}

.demo-video {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #000;
}

.demo-video video {
    width: 100%;
    display: block;
    border-radius: var(--radius-lg);
}

.demo-info {
    padding: 16px 0;
}

.demo-badge {
    display: inline-block;
    padding: 6px 12px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.demo-info h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.demo-info > p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.demo-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.demo-tags span {
    padding: 6px 14px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.demo-meta {
    display: flex;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 24px;
}

.demo-actions {
    display: flex;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: white;
}

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

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

.btn-outline:hover {
    background: var(--glass-border);
}

.demo-placeholder {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.placeholder-card {
    padding: 40px;
    background: var(--glass-bg);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-xl);
    text-align: center;
}

.placeholder-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.placeholder-card h3 {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.placeholder-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* =============================================
   页脚
   ============================================= */
footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
}

.footer-copy {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .demo-card {
        grid-template-columns: 1fr;
    }
    
    .demo-placeholder {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .menu-toggle {
        display: block;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 16px 24px;
        gap: 0;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        padding: 12px 0;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .product-card {
        padding: 24px;
    }
    
    .lab-card {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .lab-thumb {
        width: 100%;
        height: 180px;
    }
    
    .demo-actions {
        flex-direction: column;
    }
    
    .footer-inner {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}