/* 腾龙公司官网 - 深色模式(OLED) 霓虹/赛博朋克风格 */
:root {
    --bg-black: #000000;
    --bg-dark-grey: #121212;
    --bg-midnight: #0A0E27;
    --text-primary: #FFFFFF;
    --text-secondary: #B8BCC8;
    --accent-neon: #39FF14;
    --accent-blue: #0080FF;
    --accent-gold: #FFD700;
    --accent-purple: #BF00FF;
    --accent-purple-text: #D966FF;
    --border-color: #26262E;
    --radius: 10px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: var(--bg-black);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    min-height: 100vh;
}

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

/* 顶部导航栏 */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent-neon), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.3s, text-shadow 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-neon);
    text-shadow: 0 0 10px var(--accent-neon);
}

.nav-cta {
    padding: 10px 24px;
    background: var(--accent-neon);
    color: var(--bg-black);
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.nav-cta:hover {
    box-shadow: 0 0 20px var(--accent-neon);
    transform: translateY(-2px);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
}

/* Hero 区域 */
.hero {
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(57, 255, 20, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(0, 128, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-neon);
    margin-bottom: 24px;
    padding: 8px 16px;
    border: 1px solid var(--accent-neon);
    border-radius: var(--radius);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    min-height: 48px;
}

.btn-primary {
    background: var(--accent-neon);
    color: var(--bg-black);
}

.btn-primary:hover {
    box-shadow: 0 0 30px var(--accent-neon);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    box-shadow: 0 0 15px rgba(0, 128, 255, 0.3);
}

/* 风格信息条 */
.style-chips {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    margin: 40px 0;
}

.chip {
    padding: 8px 16px;
    background: var(--bg-dark-grey);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.chip.neon {
    border-color: var(--accent-neon);
    color: var(--accent-neon);
}

.chip.blue {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

/* 章节标题 */
.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 特性卡片 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-dark-grey);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-neon), var(--accent-blue));
    opacity: 0;
    transition: opacity 0.3s;
}

.feature-card:hover {
    border-color: var(--accent-neon);
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(57, 255, 20, 0.1);
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 20px;
    color: var(--accent-neon);
}

.feature-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 关于我们区域 */
.about-section {
    background: var(--bg-midnight);
    border-radius: var(--radius);
    padding: 60px;
    margin: 40px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

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

.stat-item {
    text-align: center;
    padding: 24px;
    background: var(--bg-dark-grey);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--accent-neon);
    text-shadow: 0 0 20px var(--accent-neon);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* 产品展示 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.service-card {
    background: var(--bg-dark-grey);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    transition: all 0.3s;
}

.service-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 128, 255, 0.15);
}

.service-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    color: var(--accent-blue);
}

.service-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.service-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: var(--bg-dark-grey);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

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

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

.footer-links h4 {
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
}

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

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

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-black);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-cta {
        display: none;
    }
    
    .hero {
        padding: 80px 0 60px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-section {
        padding: 40px 24px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .features-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }
}

/* 焦点可见 */
*:focus-visible {
    outline: 2px solid var(--accent-neon);
    outline-offset: 2px;
}

/* 服务详情页图片 */
.service-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.service-img-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: var(--radius);
    min-height: 240px;
}

/* 首页服务卡片图片 */
.service-card-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s;
}

.service-card:hover .service-card-img {
    transform: scale(1.03);
}

/* 面包屑导航 */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.breadcrumb a:hover {
    color: var(--accent-neon);
}

.breadcrumb span {
    color: var(--text-primary);
}

/* 减弱动效 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}