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

:root {
    /* 主色调 - 深紫色+金色现代科技风格 */
    --primary-color: #6B46C1;
    --primary-dark: #553C9A;
    --primary-light: #8B5CF6;
    --secondary-color: #F59E0B;
    --secondary-dark: #D97706;
    --secondary-light: #FBBF24;
    --accent-color: #EC4899;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --bg-light: #F9FAFB;
    --bg-white: #FFFFFF;
    --bg-dark: #111827;
    --border-color: #E5E7EB;
    --gradient-primary: linear-gradient(135deg, #6B46C1 0%, #8B5CF6 100%);
    --gradient-secondary: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);
    --gradient-hero: linear-gradient(135deg, #6B46C1 0%, #8B5CF6 50%, #F59E0B 100%);
    --shadow-sm: 0 2px 4px rgba(107, 70, 193, 0.1);
    --shadow-md: 0 4px 8px rgba(107, 70, 193, 0.15);
    --shadow-lg: 0 8px 16px rgba(107, 70, 193, 0.2);
    --shadow-xl: 0 12px 24px rgba(107, 70, 193, 0.25);
    --shadow-gold: 0 4px 12px rgba(245, 158, 11, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.header {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(107, 70, 193, 0.3));
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.brand-name {
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
    padding: 0.5rem 0;
}

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

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

/* 英雄区块 */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: 6rem 0;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 0.1;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(107, 70, 193, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-50px, -50px) rotate(180deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease-out;
}

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

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-secondary);
    color: white;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-gold);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--gradient-secondary);
    color: white;
    box-shadow: var(--shadow-gold);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(245, 158, 11, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.hero-image {
    position: relative;
    animation: fadeInRight 0.8s ease-out 0.2s both;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-card {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-5deg);
    transition: var(--transition);
}

.hero-card:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.hero-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-indicator {
    width: 30px;
    height: 50px;
    border: 2px solid var(--primary-color);
    border-radius: 25px;
    position: relative;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0% { transform: translateX(-50%) translateY(0); opacity: 1; }
    100% { transform: translateX(-50%) translateY(20px); opacity: 0; }
}

/* 页面标题 */
.page-header {
    background: var(--gradient-primary);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-header-content {
    max-width: 800px;
    margin: 0 auto;
}

.page-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.page-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.page-description {
    font-size: 1.25rem;
    opacity: 0.9;
}

/* 区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-secondary);
    color: white;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-gold);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* 介绍区块 */
.intro-section {
    padding: 6rem 0;
    background: var(--bg-light);
}

.intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.intro-image {
    position: relative;
}

.intro-card {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.intro-card img {
    width: 100%;
    height: auto;
    display: block;
}

.intro-text {
    animation: fadeInLeft 0.8s ease-out;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.intro-description {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

/* 产品区块 */
.products-section {
    padding: 6rem 0;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.product-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
}

.product-card.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.product-card:nth-child(1) { animation-delay: 0.1s; }
.product-card:nth-child(2) { animation-delay: 0.2s; }
.product-card:nth-child(3) { animation-delay: 0.3s; }
.product-card:nth-child(4) { animation-delay: 0.4s; }

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.product-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-content {
    padding: 1.5rem;
}

.product-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.product-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.product-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.product-link:hover {
    color: var(--primary-dark);
    gap: 0.5rem;
}

/* 新闻区块 */
.news-section {
    padding: 6rem 0;
    background: var(--bg-light);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.news-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
}

.news-card.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.news-card:nth-child(1) { animation-delay: 0.1s; }
.news-card:nth-child(2) { animation-delay: 0.2s; }
.news-card:nth-child(3) { animation-delay: 0.3s; }

.news-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.news-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

.news-card:hover .news-image img {
    transform: scale(1.1);
}

.news-content {
    padding: 1.5rem;
}

.news-date {
    display: inline-block;
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.news-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
    line-height: 1.4;
}

.news-excerpt {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.news-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.news-link:hover {
    color: var(--primary-dark);
}

/* 数据统计 */
.stats-section {
    padding: 4rem 0;
    background: var(--gradient-primary);
    color: white;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item {
    opacity: 0;
}

.stat-item.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.stat-item:nth-child(1) { animation-delay: 0.1s; }
.stat-item:nth-child(2) { animation-delay: 0.2s; }
.stat-item:nth-child(3) { animation-delay: 0.3s; }
.stat-item:nth-child(4) { animation-delay: 0.4s; }

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1.125rem;
    opacity: 0.9;
}

/* 产品列表页 */
.filter-section {
    padding: 2rem 0;
    background: var(--bg-light);
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
}

.products-list-section {
    padding: 4rem 0;
}

.product-category {
    margin-bottom: 4rem;
}

.category-header {
    text-align: center;
    margin-bottom: 3rem;
}

.category-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.category-description {
    font-size: 1.125rem;
    color: var(--text-light);
}

.products-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.product-item-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
}

.product-item-card.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.product-item-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.product-item-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

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

.product-item-card:hover .product-item-image img {
    transform: scale(1.1);
}

.product-item-content {
    padding: 2rem;
}

.product-item-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.product-item-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.product-item-features {
    list-style: none;
}

.product-item-features li {
    padding: 0.5rem 0;
    color: var(--text-light);
}

/* 关于我们页 */
.about-intro-section {
    padding: 4rem 0;
}

.about-intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-intro-image {
    position: relative;
}

.about-intro-card {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-intro-card img {
    width: 100%;
    height: auto;
    display: block;
}

.about-intro-description {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.history-section {
    padding: 6rem 0;
    background: var(--bg-light);
}

.history-timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding-left: 2rem;
}

.history-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    opacity: 0;
}

.timeline-item.fade-in {
    animation: fadeInLeft 0.6s ease-out forwards;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.5rem;
    top: 0.5rem;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: var(--shadow-md);
}

.timeline-year {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50px;
    font-weight: 700;
    margin-bottom: 1rem;
}

.timeline-content {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.timeline-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.timeline-description {
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.timeline-image {
    border-radius: 10px;
    overflow: hidden;
    margin-top: 1rem;
}

.timeline-image img {
    width: 100%;
    height: auto;
    display: block;
}

.team-section {
    padding: 6rem 0;
}

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

.team-member {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
}

.team-member.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.team-member:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.team-member-image {
    width: 100%;
    height: 300px;
    overflow: hidden;
}

.team-member-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.team-member:hover .team-member-image img {
    transform: scale(1.1);
}

.team-member-content {
    padding: 2rem;
    text-align: center;
}

.team-member-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.team-member-role {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.team-member-bio {
    color: var(--text-light);
    line-height: 1.7;
}

.culture-section {
    padding: 6rem 0;
    background: var(--bg-light);
}

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

.culture-item {
    background: white;
    padding: 3rem 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
}

.culture-item.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.culture-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.culture-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.culture-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.culture-description {
    color: var(--text-light);
    line-height: 1.7;
}

/* 联系页面 */
.contact-section {
    padding: 4rem 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-form-wrapper,
.contact-info-wrapper {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.contact-form-header,
.contact-info-header {
    margin-bottom: 2rem;
}

.contact-form-title,
.contact-info-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-form-description,
.contact-info-description {
    color: var(--text-light);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    font-weight: 600;
    color: var(--text-dark);
}

.form-input {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(107, 70, 193, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 150px;
}

.btn-submit {
    width: 100%;
    margin-top: 1rem;
}

.contact-info-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-info-card {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
    opacity: 0;
}

.contact-info-card.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.contact-info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.contact-info-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.contact-info-card-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-info-card-content {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.contact-map {
    border-radius: 15px;
    overflow: hidden;
    margin-top: 2rem;
}

.map-placeholder {
    width: 100%;
    height: 300px;
    overflow: hidden;
}

.map-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.faq-section {
    padding: 6rem 0;
    background: var(--bg-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: 15px;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    opacity: 0;
}

.faq-item.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-dark);
}

.faq-toggle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 1rem;
}

.footer-brand .logo-icon {
    font-size: 2rem;
}

.footer-brand .brand-name {
    font-size: 1.5rem;
    color: white;
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-contact {
    list-style: none;
}

.footer-contact li {
    margin-bottom: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
    }

    .nav-menu.active {
        left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .intro-content,
    .about-intro-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .products-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }

    .products-list-grid {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-info-cards {
        grid-template-columns: 1fr;
    }

    .team-grid,
    .culture-grid {
        grid-template-columns: 1fr;
    }

    .history-timeline {
        padding-left: 1.5rem;
    }

    .timeline-item::before {
        left: -1.75rem;
    }

    .page-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .filter-tabs {
        flex-direction: column;
    }

    .filter-btn {
        width: 100%;
    }
}

/* 淡入动画 */
.fade-in {
    opacity: 0;
}

.fade-in.visible {
    opacity: 1;
    animation: fadeInUp 0.6s ease-out forwards;
}