/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

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

/* 头部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav {
    padding: 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    max-width: 1300px;
    margin: 0 auto;
    padding-left: 20px;
    padding-right: 20px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    height: 45px;
    width: auto;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2c5aa0;
    letter-spacing: -0.5px;
}

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

.nav-link {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #2c5aa0;
    background: rgba(44, 90, 160, 0.08);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: #2c5aa0;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link.active::after {
    width: 80%;
}

.nav-actions {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-phone {
    text-decoration: none;
    color: #2c5aa0;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border: 2px solid #2c5aa0;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-phone:hover {
    background: #2c5aa0;
    color: white;
    transform: translateY(-2px);
}

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

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #2c5aa0;
    transition: all 0.3s ease;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #2c5aa0, #1e3d72);
    color: white;
    box-shadow: 0 4px 15px rgba(44, 90, 160, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(44, 90, 160, 0.4);
}

.btn-secondary {
    background: transparent;
    color: #2c5aa0;
    border: 2px solid #2c5aa0;
}

.btn-secondary:hover {
    background: #2c5aa0;
    color: white;
    transform: translateY(-2px);
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    overflow: hidden;
    margin-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: url('./img/banner.jpg') center center/cover no-repeat;
    clip-path: polygon(20% 0%, 100% 0%, 100% 100%, 0% 100%);
}

.hero-container {
    position: relative;
    z-index: 2;
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: #1a202c;
    letter-spacing: -1px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.hero-subtitle {
    display: block;
    font-size: 2rem;
    font-weight: 600;
    color: #2c5aa0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-title-main {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a202c;
    letter-spacing: -0.5px;
}

.hero-description {
    font-size: 1.2rem;
    color: #4a5568;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
    position: relative;
}

.stat::after {
    content: '';
    position: absolute;
    right: -1.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: #e2e8f0;
}

.stat:last-child::after {
    display: none;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: #2c5aa0;
    line-height: 1;
}

.stat-label {
    font-size: 0.95rem;
    color: #718096;
    font-weight: 500;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 特性区域 */
.features {
    padding: 100px 0;
    background: #fff;
}

.section-title {
    text-align: center;
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: #1a202c;
    letter-spacing: -1px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #718096;
    max-width: 700px;
    margin: 0 auto 4rem;
    line-height: 1.6;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background: #fff;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s ease;
    border: 1px solid rgba(226, 232, 240, 0.8);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #2c5aa0, #1e3d72);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #2c5aa0, #1e3d72);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
    color: white;
    font-size: 1.8rem;
    box-shadow: 0 8px 20px rgba(44, 90, 160, 0.3);
}

.feature-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1a202c;
    text-align: center;
}

.feature-card p {
    color: #718096;
    line-height: 1.7;
    font-size: 1.05rem;
}

/* 产品区域 */
.products {
    padding: 100px 0;
    background: #f8fafc;
}

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

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.product-card {
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s ease;
    border: 1px solid rgba(226, 232, 240, 0.8);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.product-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.product-card:hover .product-image {
    transform: scale(1.05);
}

.product-content {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1a202c;
}

.product-card .btn {
    margin-top: auto;
    align-self: flex-start;
}

.product-card p {
    color: #718096;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.product-specs {
    margin-bottom: 1.5rem;
    padding-left: 0;
    list-style: none;
}

.product-specs li {
    position: relative;
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    color: #4a5568;
    font-size: 0.95rem;
    line-height: 1.5;
}

.product-specs li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #2c5aa0;
    font-weight: bold;
    font-size: 1rem;
}

.btn-outline {
    background: transparent;
    color: #2c5aa0;
    border: 2px solid #2c5aa0;
    transition: all 0.3s ease;
}

.btn-outline:hover {
    background: #2c5aa0;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(44, 90, 160, 0.3);
}

/* 应用场景 */
.applications {
    padding: 100px 0;
    background: #fff;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.application-item {
    text-align: center;
    padding: 2.5rem;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.8);
    transition: all 0.4s ease;
    border: 2px solid rgba(170, 170, 171, 0.8);
    position: relative;
    overflow: hidden;
}

.application-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../img/bansner.jpg') center/cover no-repeat;
    opacity: 0.3;
    z-index: 0;
    pointer-events: none;
}

.application-item > * {
    position: relative;
    z-index: 1;
}

.application-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.application-icon {
    width: 90px;
    height: 90px;
    background: linear-gradient(135deg, #2c5aa0, #1e3d72);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2.2rem;
    box-shadow: 0 8px 20px rgba(44, 90, 160, 0.3);
}

.application-item h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1a202c;
}

.application-item p {
    color: #26344b;
    line-height: 1.7;
    font-weight: 500;
}

/* 技术参数 */
.specifications {
    padding: 100px 0;
    background: #f8fafc;
}

.specs-table-container {
    overflow-x: auto;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.specs-table {
    width: 100%;
    background: #fff;
    border-collapse: collapse;
    min-width: 800px;
}

.specs-table th,
.specs-table td {
    padding: 1.25rem 1rem;
    text-align: center;
    border-bottom: 1px solid #e2e8f0;
    font-size: 1.05rem;
}

.specs-table thead {
    background: linear-gradient(135deg, #2c5aa0, #1e3d72);
}

.specs-table th {
    color: white;
    font-weight: 600;
    padding: 1.5rem 1rem;
    font-size: 1.1rem;
}

.specs-table tbody tr {
    transition: all 0.3s ease;
}

.specs-table tbody tr:hover {
    background: #f7fafc;
    transform: translateY(-1px);
}

.specs-table tbody tr:last-child {
    border-bottom: none;
}

.specs-table tbody tr:nth-child(even) {
    background: #fafbfc;
}

.specs-table tbody tr:nth-child(even):hover {
    background: #f1f5f9;
}

.specs-table td:first-child {
    font-weight: 600;
    color: #2c5aa0;
}

.specs-table td {
    color: #4a5568;
    font-weight: 500;
}

/* 视频展示 */
.video-showcase {
    padding: 100px 0;
    background: #f8fafc;
}

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

.video-player {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    background: #000;
}

.video-placeholder {
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
    display: block;
}

.video-placeholder:hover {
    transform: scale(1.02);
}

.video-thumbnail {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
    cursor: pointer;
    z-index: 10;
}

.play-button:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.video-element {
    width: 100%;
    height: 300px;
    display: none;
    border-radius: 16px;
    object-fit: cover;
    background: #000;
}

.video-element.playing {
    display: block;
}

.video-placeholder.hidden {
    display: none;
}

.video-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.video-content h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 0.5rem;
}

.video-content p {
    color: #718096;
    font-size: 1.1rem;
    line-height: 1.6;
}

.video-features {
    list-style: none;
    padding-left: 0;
    margin: 1rem 0;
}

.video-features li {
    position: relative;
    padding: 0.5rem 0;
    padding-left: 2rem;
    color: #4a5568;
    font-size: 1rem;
    line-height: 1.5;
}

.video-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #2c5aa0;
    font-weight: bold;
    font-size: 1.1rem;
}

.video-stats {
    display: flex;
    gap: 2rem;
    margin: 1.5rem 0;
}

.video-stat {
    text-align: center;
    flex: 1;
}

.video-stat .stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: #2c5aa0;
    line-height: 1;
}

.video-stat .stat-label {
    font-size: 0.9rem;
    color: #718096;
    margin-top: 0.5rem;
}

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

/* 产品问答 */
.qa-section {
    padding: 100px 0;
    background: #fff;
}

.qa-container {
    max-width: 1000px;
    margin: 0 auto;
}

.qa-search {
    margin-bottom: 3rem;
}

.qa-categories {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.category-btn {
    padding: 0.875rem 1.75rem;
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    color: #4a5568;
    font-size: 1rem;
}

.category-btn:hover,
.category-btn.active {
    background: linear-gradient(135deg, #2c5aa0, #1e3d72);
    color: white;
    border-color: #2c5aa0;
    transform: translateY(-2px);
}

.qa-list {
    margin-bottom: 3rem;
}

.qa-item {
    background: #fff;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.qa-item:hover {
    border-color: #2c5aa0;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.qa-question {
    padding: 1.75rem 2rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
}

.qa-question:hover {
    background: #f7fafc;
}

.qa-question h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #1a202c;
    margin: 0;
    flex: 1;
}

.qa-toggle {
    font-size: 1.5rem;
    color: #718096;
    transition: transform 0.3s ease;
    font-weight: 300;
    margin-left: 1rem;
}

.qa-item.active .qa-toggle {
    transform: rotate(45deg);
    color: #2c5aa0;
}

.qa-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

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

.qa-answer p {
    padding: 0 2rem 2rem;
    color: #4a5568;
    line-height: 1.7;
    font-size: 1.05rem;
    margin: 0;
}

.qa-contact {
    background: #f8fafc;
    border-radius: 16px;
    padding: 3rem;
    text-align: center;
    margin-top: 3rem;
}

.qa-contact-info h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 1rem;
}

.qa-contact-info p {
    color: #718096;
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.contact-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 产品相关文章 */
.articles-section {
    padding: 100px 0;
    background: #f8fafc;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.article-card {
    background: #fff;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid rgba(226, 232, 240, 0.8);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.article-image {
    display: none;
}

.article-content {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    gap: 1rem;
}

.article-tag {
    background: linear-gradient(135deg, #2c5aa0, #1e3d72);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    align-self: flex-start;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: #1a202c;
    line-height: 1.4;
    margin: 0;
}

.article-card p {
    color: #718096;
    line-height: 1.6;
    font-size: 1rem;
    flex-grow: 1;
    margin: 0;
}

.article-link {
    color: #2c5aa0;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    align-self: flex-start;
    margin-top: auto;
}

.article-link:hover {
    color: #1e3d72;
    transform: translateX(5px);
}
.article-title-link {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: all 0.3s ease;
}

.article-title-link:hover {
    color: #2c5aa0;
}

.article-title-link h3 {
    transition: color 0.3s ease;
}

.article-title-link:hover h3 {
    color: #2c5aa0;
}

.article-title-link p {
    transition: color 0.3s ease;
}

.article-title-link:hover p {
    color: #4a5568;
}

.articles-more {
    text-align: center;
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, #1a202c, #2d3748);
    color: white;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-logo .logo {
    height: 40px;
    width: auto;
}

.footer-logo .logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: #e2e8f0;
}

.footer-info p {
    color: #a0aec0;
    line-height: 1.7;
    font-size: 1.05rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-links h3,
.footer-contact h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: #e2e8f0;
    font-weight: 700;
}

.footer-links a {
    color: #a0aec0;
    text-decoration: none;
    transition: color 0.3s ease;
    line-height: 1.7;
    font-size: 1.05rem;
}

.footer-links a:hover {
    color: white;
    text-decoration: underline;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-contact p {
    color: #a0aec0;
    line-height: 1.7;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #2d3748;
    color: #a0aec0;
    font-size: 0.95rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero::before {
        width: 100%;
        clip-path: polygon(0% 0%, 100% 0%, 100% 40%, 0% 100%);
        opacity: 0.3;
    }
    
    .hero-title {
        font-size: 3rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .nav-menu {
        display: none;
        position: fixed;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.4s ease;
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        display: flex;
    }
    
    .nav-menu .nav-link {
        padding: 1rem 0;
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        font-size: 1.1rem;
        width: 100%;
        text-align: center;
    }
    
    .nav-menu .nav-link:last-child {
        border-bottom: none;
    }
    
    .nav-toggle {
        display: flex;
        position: relative;
        z-index: 1000;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .nav-phone {
        font-size: 0.9rem;
        padding: 0.4rem 0.8rem;
        margin-right: 1rem;
    }
    
    .hero {
        margin-top: 70px;
        min-height: 90vh;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 2rem;
    }
    
    .stat::after {
        display: none;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .features-grid,
    .products-grid,
    .applications-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .feature-card,
    .product-card,
    .application-item {
        padding: 1.5rem;
    }
    
    .product-image {
        height: 200px;
    }
    
    .product-content {
        padding: 1.5rem;
    }
    
    .specs-table-container {
        border-radius: 12px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    }
    
    .specs-table {
        min-width: 600px;
        font-size: 0.9rem;
    }
    
    .specs-table th,
    .specs-table td {
        padding: 1rem 0.75rem;
        font-size: 0.9rem;
    }
    
    .specs-table th {
        padding: 1.25rem 0.75rem;
        font-size: 0.95rem;
    }
    
    .qa-categories {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }
    
    .category-btn {
        width: 100%;
        max-width: 200px;
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .qa-question {
        padding: 1.25rem 1.5rem;
    }
    
    .qa-question h3 {
        font-size: 1.1rem;
    }
    
    .qa-answer p {
        padding: 0 1.5rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .qa-contact {
        padding: 2rem;
        margin-top: 2rem;
    }
    
    .qa-contact-info h3 {
        font-size: 1.5rem;
    }
    
    .contact-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .footer-info {
        align-items: center;
    }
    
    .footer-logo {
        justify-content: center;
    }
    
    .footer-links {
        align-items: center;
    }
    
    .footer-contact {
        align-items: center;
    }
    
    .footer-contact p {
        justify-content: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
        padding: 1rem 1.5rem;
        font-size: 1rem;
        min-height: 48px;
        touch-action: manipulation;
    }
    
    .nav-link,
    .category-btn,
    .qa-question {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        touch-action: manipulation;
    }
    
    .nav-toggle {
        min-width: 44px;
        min-height: 44px;
        touch-action: manipulation;
    }
    
    .video-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .video-thumbnail,
    .video-element {
        height: 250px;
    }
    
    .video-stats {
        justify-content: center;
        gap: 1.5rem;
    }
    
    .video-actions {
        justify-content: center;
    }
    
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .article-card {
        padding: 1.5rem;
    }
    
    .article-card h3 {
        font-size: 1.2rem;
    }
    
    .article-card p {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 12px;
    }
    
    .hero {
        margin-top: 60px;
        min-height: 80vh;
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
        line-height: 1.2;
        margin-bottom: 1rem;
        gap: 0.3rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-title-main {
        font-size: 1.5rem;
    }
    
    .hero-description {
        font-size: 0.95rem;
        margin-bottom: 2rem;
    }
    
    .section-title {
        font-size: 1.6rem;
        margin-bottom: 0.5rem;
    }
    
    .section-subtitle {
        font-size: 0.9rem;
        margin-bottom: 2rem;
    }
    
    .feature-card,
    .product-card,
    .application-item {
        padding: 1.25rem;
        margin-bottom: 1rem;
    }
    
    .qa-question {
        padding: 1.25rem 1.5rem;
    }
    
    .qa-question h3 {
        font-size: 1.1rem;
    }
    
    .footer {
        padding: 60px 0 20px;
    }
    
    .specs-table-container {
        border-radius: 8px;
        box-shadow: 0 1px 5px rgba(0, 0, 0, 0.08);
        margin: 0 -12px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .specs-table {
        min-width: 600px;
        font-size: 0.8rem;
    }
    
    .specs-table th,
    .specs-table td {
        padding: 0.75rem 0.5rem;
        font-size: 0.8rem;
        white-space: nowrap;
    }
    
    .specs-table th {
        padding: 0.9rem 0.5rem;
        font-size: 0.85rem;
        position: sticky;
        left: 0;
        background: linear-gradient(135deg, #2c5aa0, #1e3d72);
    }
    
    .specs-table td:first-child {
        position: sticky;
        left: 0;
        background: #f7fafc;
        z-index: 1;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .product-card {
        padding: 1rem;
    }
    
    .product-image {
        height: 180px;
    }
    
    .product-content {
        padding: 1rem;
    }
    
    .product-card h3 {
        font-size: 1.2rem;
    }
    
    .product-specs li {
        font-size: 0.9rem;
        padding-left: 1.25rem;
    }
    
    .video-container {
        gap: 2rem;
    }
    
    .video-thumbnail,
    .video-element {
        height: 200px;
    }
    
    .video-content h3 {
        font-size: 1.5rem;
    }
    
    .video-content p {
        font-size: 1rem;
    }
    
    .video-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .video-stat .stat-number {
        font-size: 1.8rem;
    }
    
    .video-features li {
        font-size: 0.9rem;
        padding-left: 1.5rem;
    }
    
    .qa-container {
        padding: 0 1rem;
    }
    
    .qa-categories {
        gap: 0.5rem;
    }
    
    .category-btn {
        max-width: 100%;
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }
    
    .qa-question {
        padding: 1rem;
    }
    
    .qa-question h3 {
        font-size: 1rem;
    }
    
    .qa-toggle {
        font-size: 1.2rem;
        margin-left: 0.5rem;
    }
    
    .qa-answer p {
        padding: 0 1rem 1rem;
        font-size: 0.9rem;
    }
    
    .qa-contact {
        padding: 1.5rem;
        margin-top: 1.5rem;
    }
    
    .qa-contact-info h3 {
        font-size: 1.3rem;
    }
    
    .qa-contact-info p {
        font-size: 0.95rem;
    }
    
    .footer {
        padding: 60px 0 20px;
    }
    
    .footer-content {
        gap: 1.5rem;
    }
    
    .footer-logo .logo {
        height: 35px;
    }
    
    .footer-logo .logo-text {
        font-size: 1.3rem;
    }
    
    .footer-info p,
    .footer-links a,
    .footer-contact p {
        font-size: 0.95rem;
    }
    
    .footer-links h3,
    .footer-contact h3 {
        font-size: 1.2rem;
        margin-bottom: 1rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .article-card {
        padding: 1.25rem;
    }
    
    .article-card h3 {
        font-size: 1.1rem;
    }
    
    .article-card p {
        font-size: 0.9rem;
    }
    
    .article-tag {
        font-size: 0.8rem;
        padding: 0.3rem 0.8rem;
    }
    
    .article-link {
        font-size: 0.9rem;
    }
    
    /* 防止移动端缩放 */
    input, select, textarea {
        font-size: 16px !important;
    }
    
    /* 优化滚动性能 */
    * {
        -webkit-tap-highlight-color: transparent;
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        user-select: none;
    }
    
    p, h1, h2, h3, h4, h5, h6, a, span {
        -webkit-user-select: text;
        user-select: text;
    }
    
    /* 优化图片加载 */
    img {
        max-width: 100%;
        height: auto;
    }
    
    /* 防止水平滚动 */
    body {
        overflow-x: hidden;
        width: 100%;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #2c5aa0;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #1e3d72;
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 33%;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #2c5aa0, #1e3d72);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(44, 90, 160, 0.3);
    transition: all 0.3s ease;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: linear-gradient(135deg, #1e3d72, #2c5aa0);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(44, 90, 160, 0.4);
}

.back-to-top:active {
    transform: translateY(-1px);
}

/* 移动端优化 */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 2rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .back-to-top {
        bottom: 1.5rem;
        right: 1rem;
        width: 40px;
        height: 40px;
    }
    
    .back-to-top svg {
        width: 20px;
        height: 20px;
    }
}