/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #4a90e2;
    --primary-blue-light: #5ba3f5;
    --text-dark: #2c3e50;
    --text-gray: #7f8c8d;
    --text-light: #ffffff;
    --bg-light: #ffffff;
    --bg-gray: #f5f7fa;
    --bg-dark: #1a202c;
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    transition: all var(--transition-fast);
}

.navbar.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.12);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    z-index: 1001;
}

.logo-img {
    height: 42px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.5px;
    position: relative;
    padding: 8px 0;
    transition: all var(--transition-fast);
}

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

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

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

.nav-link.active {
    color: var(--primary-blue);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger span {
    width: 100%;
    height: 2px;
    background: var(--primary-blue);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ==================== 首页横幅 ==================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, var(--primary-blue) 50%, #764ba2 100%);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.08) 0%, transparent 40%);
    animation: heroPulse 8s ease-in-out infinite;
}

@keyframes heroPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.2);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--text-light);
    padding: 0 20px;
    opacity: 0;
    transform: translateY(30px);
    animation: heroFadeIn 1s ease-out forwards;
    animation-delay: 0.3s;
}

@keyframes heroFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-title-line {
    display: block;
    opacity: 0;
    transform: translateY(20px);
    animation: heroTitleLine 0.8s ease-out forwards;
}

.hero-title-line:nth-child(1) {
    animation-delay: 0.5s;
}

.hero-title-line:nth-child(2) {
    animation-delay: 0.7s;
}

@keyframes heroTitleLine {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-weight: 300;
    margin-bottom: 48px;
    letter-spacing: 2px;
    opacity: 0;
    animation: heroFadeIn 0.8s ease-out forwards;
    animation-delay: 0.9s;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 40px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-blue);
    border: 2px solid transparent;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    opacity: 0;
    animation: heroFadeIn 0.8s ease-out forwards;
    animation-delay: 1.1s;
}

.hero-btn:hover {
    transform: translateY(-3px);
    background: white;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.hero-btn svg {
    transition: transform var(--transition-fast);
}

.hero-btn:hover svg {
    transform: translateX(5px);
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: scrollBounce 2s ease-in-out infinite;
}

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

.scroll-dot {
    width: 8px;
    height: 8px;
    background: var(--text-light);
    border-radius: 50%;
    opacity: 0.6;
}

/* ==================== 通用区块样式 ==================== */
section {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.section-line {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-blue-light));
    margin: 0 auto;
}

/* ==================== 项目背景 ==================== */
.background {
    background: var(--bg-light);
}

.background-content {
    max-width: 900px;
    margin: 0 auto;
}

.background-text {
    background: linear-gradient(135deg, var(--bg-gray) 0%, white 100%);
    padding: 60px;
    border-radius: 24px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.background-paragraph {
    font-size: 1.125rem;
    line-height: 1.9;
    color: var(--text-gray);
    margin-bottom: 32px;
    text-align: justify;
}

.background-paragraph:last-child {
    margin-bottom: 0;
}

.highlight {
    color: var(--primary-blue);
    font-weight: 600;
}

/* ==================== 产品服务 ==================== */
.product {
    background: linear-gradient(180deg, var(--bg-gray) 0%, var(--bg-light) 100%);
}

.product-card {
    max-width: 600px;
    margin: 0 auto;
    background: linear-gradient(135deg, white 0%, var(--bg-gray) 100%);
    padding: 80px 60px;
    border-radius: 30px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: all var(--transition-slow);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.12);
}

.product-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 120px;
    height: 120px;
    margin: 0 auto 40px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, #667eea 100%);
    border-radius: 50%;
    color: var(--text-light);
}

.product-icon svg {
    animation: iconRotate 20s linear infinite;
}

@keyframes iconRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.product-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.product-description {
    font-size: 1.125rem;
    color: var(--text-gray);
    margin-bottom: 40px;
    line-height: 1.7;
}

.product-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 40px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--text-light);
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.product-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(26, 54, 93, 0.4);
}

.product-btn svg {
    transition: transform var(--transition-fast);
}

.product-btn:hover svg {
    transform: translate(5px, -5px);
}

/* ==================== 团队 ==================== */
.team {
    background: var(--bg-light);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.team-member {
    background: linear-gradient(135deg, var(--bg-gray) 0%, white 100%);
    border-radius: 24px;
    padding: 40px 30px;
    text-align: center;
    transition: all var(--transition-slow);
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.team-member:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.member-photo {
    width: 180px;
    height: 180px;
    margin: 0 auto 24px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--primary-blue);
}

.photo-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-blue) 0%, #667eea 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 500;
}

.member-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.member-role {
    font-size: 1rem;
    color: var(--primary-blue);
    font-weight: 500;
    margin-bottom: 16px;
}

.member-desc {
    font-size: 0.95rem;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ==================== 联系我们 ==================== */
.contact {
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-gray) 100%);
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: linear-gradient(135deg, white 0%, var(--bg-gray) 100%);
    padding: 40px;
    border-radius: 24px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: all var(--transition-fast);
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, #667eea 100%);
    border-radius: 50%;
    color: var(--text-light);
    flex-shrink: 0;
}

.contact-text {
    flex: 1;
}

.contact-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-gray);
    margin-bottom: 4px;
}

.contact-link {
    display: block;
    font-size: 1.25rem;
    color: var(--primary-blue);
    font-weight: 600;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-link:hover {
    color: var(--primary-blue-light);
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.footer-links {
    text-align: center;
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--text-light);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.footer-icp {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-icp:hover {
    color: var(--text-light);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .background-text {
        padding: 40px;
    }
    
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 30px;
        transform: translateX(100%);
        transition: transform var(--transition-slow);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-link {
        font-size: 1.5rem;
        font-weight: 500;
        color: var(--text-dark);
    }
    
    .hamburger {
        display: flex;
    }
    
    section {
        padding: 80px 0;
    }
    
    .section-header {
        margin-bottom: 60px;
    }
    
    .hero {
        min-height: 600px;
    }
    
    .hero-btn {
        padding: 16px 36px;
    }
    
    .background-text {
        padding: 30px;
    }
    
    .background-paragraph {
        font-size: 1rem;
    }
    
    .product-card {
        padding: 50px 30px;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-nav {
        gap: 20px;
    }
    
    .contact-item {
        padding: 30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .nav-container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .product-card {
        padding: 40px 20px;
    }
    
    .team-member {
        padding: 30px 20px;
    }
    
    .member-photo {
        width: 150px;
        height: 150px;
    }
}

/* ==================== 滚动动画 ==================== */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ==================== 选择样式 ==================== */
::selection {
    background: var(--primary-blue);
    color: var(--text-light);
}