:root {
    --primary: #0070ff;
    --primary-dark: #0055cc;
    --secondary: #00d4ff;
    --dark: #0a1628;
    --darker: #060d18;
    --light: #ffffff;
    --gray: #8a9bb8;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--darker);
    color: var(--light);
    overflow-x: hidden;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1rem 0;
    z-index: 1000;
    transition: all 0.3s ease;
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(0, 112, 255, 0.1);
}

.navbar-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light) !important;
}

.navbar-brand svg {
    width: 32px;
    height: 32px;
    margin-right: 8px;
}

.navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.8) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: color 0.3s;
}

.navbar-nav .nav-link:hover {
    color: var(--secondary) !important;
}

.navbar-nav .nav-link.active {
    color: var(--secondary) !important;
}

.navbar-toggler {
    border: none;
    padding: 0;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 页面标题区 */
.page-header {
    min-height: 60vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 50%, #0d1f3c 100%);
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 112, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
}

.page-header-content {
    position: relative;
    z-index: 2;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.25rem;
    color: var(--gray);
    max-width: 600px;
}

/* 面包屑导航 */
.breadcrumb {
    background: transparent;
    padding: 1rem 0;
    margin: 0;
}

.breadcrumb-item {
    color: var(--gray);
}

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

.breadcrumb-item a:hover {
    color: var(--secondary);
}

.breadcrumb-item.active {
    color: var(--secondary);
}

/* 关于我们内容 */
.about {
    padding: 80px 0;
}

/* 公司介绍 */
.company-intro {
    margin-bottom: 80px;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-title p {
    color: var(--gray);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

.intro-content {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3rem;
}

.intro-content h3 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    position: relative;
    padding-left: 1rem;
}

.intro-content h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--gradient);
    border-radius: 4px;
}

.intro-content p {
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.intro-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    transition: all 0.3s;
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(0, 112, 255, 0.3);
    transform: translateY(-5px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--gray);
    font-size: 1rem;
}

/* 核心团队 */
.team {
    margin-bottom: 80px;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.team-member {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s;
}

.team-member:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(0, 112, 255, 0.3);
    transform: translateY(-5px);
}

.team-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--gradient);
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: white;
}

.team-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.team-position {
    color: var(--secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.team-bio {
    color: var(--gray);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 荣誉资质 */
.certifications {
    margin-bottom: 80px;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.cert-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s;
}

.cert-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(0, 112, 255, 0.3);
    transform: translateY(-5px);
}

.cert-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.cert-date {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.cert-description {
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 发展历程 */
.timeline {
    margin-bottom: 80px;
}

.timeline-item {
    position: relative;
    padding-left: 3rem;
    margin-bottom: 3rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: -3rem;
    width: 2px;
    background: rgba(0, 112, 255, 0.3);
}

.timeline-dot {
    position: absolute;
    left: -9px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--gradient);
    z-index: 1;
}

.timeline-year {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--secondary);
}

.timeline-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-description {
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

.timeline-item:last-child::before {
    bottom: 0;
}

/* 联系我们 CTA */
.contact-cta {
    background: var(--gradient);
    border-radius: 24px;
    padding: 4rem;
    margin: 4rem 0;
    text-align: center;
}

.contact-cta h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: white;
}

.contact-cta p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-primary-custom {
    background: white;
    color: var(--primary);
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
}

.btn-primary-custom:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    color: var(--primary);
}

/* 页脚 */
.footer {
    background: var(--darker);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 60px 0 30px;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.footer-brand svg {
    width: 28px;
    height: 28px;
    margin-right: 8px;
}

.footer-text {
    color: var(--gray);
    line-height: 1.8;
}

.footer h5 {
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--gray);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 3rem;
    padding-top: 2rem;
    text-align: center;
    color: var(--gray);
    font-size: 0.9rem;
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 999;
    box-shadow: 0 4px 20px rgba(0, 112, 255, 0.4);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
}

/* 动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式 */
@media (max-width: 992px) {
    .page-header h1 {
        font-size: 2.5rem;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .page-header h1 {
        font-size: 2rem;
    }
    
    .intro-content {
        padding: 2rem;
    }
    
    .contact-cta {
        padding: 2rem;
    }
}

/* 移动端菜单 */
@media (max-width: 992px) {
    .navbar-collapse {
        background: rgba(6, 13, 24, 0.98);
        padding: 2rem;
        border-radius: 16px;
        margin-top: 1rem;
    }
}