/* ===== 全局样式 ===== */
:root {
    --primary-color: #2c3e50;      /* 深蓝灰 - 主色调 */
    --secondary-color: #3498db;    /* 亮蓝 - 强调色 */
    --accent-color: #1abc9c;       /* 青绿色 - 点缀色 */
    --dark-color: #1a252f;         /* 深色背景 */
    --light-color: #ecf0f1;        /* 浅色背景 */
    --text-color: #333;            /* 主要文字颜色 */
    --text-light: #7f8c8d;         /* 浅色文字 */
    --border-color: #dfe6e9;       /* 边框颜色 */
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --container-width: 1200px;
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', 'Montserrat', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-color);
}

img {
    max-width: 100%;
    height: auto;
}

ul, ol {
    list-style: none;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 80px 0;
}

.bg-light {
    background-color: var(--light-color);
}

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

.mt-4 {
    margin-top: 2rem;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    font-family: 'Montserrat', sans-serif;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-light {
    background-color: white;
    color: var(--primary-color);
    border-color: white;
}

.btn-light:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-outline {
    background-color: transparent;
    color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-outline:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.1rem;
}

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

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 20px;
}

.section-divider {
    height: 1px;
    width: 100px;
    background-color: var(--border-color);
    margin: 20px auto;
}

/* ===== 顶部公告栏 ===== */
.top-bar {
    background-color: var(--dark-color);
    color: white;
    padding: 10px 0;
    font-size: 0.9rem;
}

.top-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.top-bar-content span {
    margin-right: 20px;
    display: inline-flex;
    align-items: center;
}

.top-bar-content span i {
    margin-right: 8px;
    font-size: 0.8rem;
}

.language-switch {
    display: flex;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.lang-btn {
    padding: 5px 15px;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
}

.lang-btn.active {
    background-color: var(--secondary-color);
}

.lang-btn:hover:not(.active) {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ===== 导航栏 ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: white;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    height: var(--header-height);
    display: flex;
    align-items: center;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-en {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--primary-color);
    line-height: 1.2;
}

.logo-cn {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.2;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    width: 30px;
    height: 24px;
    justify-content: space-between;
}

.nav-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

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

.nav-menu li {
    margin-left: 30px;
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    color: var(--text-color);
    font-weight: 500;
    font-size: 1rem;
    padding: 10px 0;
    position: relative;
}

.nav-link i {
    margin-right: 8px;
    font-size: 1.1rem;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--secondary-color);
    transition: var(--transition);
    border-radius: 2px;
}

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

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

.nav-cta .btn {
    margin-left: 10px;
}

/* ===== 轮播图 Banner ===== */
.hero-banner {
    position: relative;
    height: 600px;
    overflow: hidden;
}

.banner-slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1s ease;
    display: flex;
    align-items: center;
}

.banner-slide.active {
    opacity: 1;
    z-index: 1;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(44, 62, 80, 0.85) 0%, rgba(44, 62, 80, 0.7) 100%);
    z-index: 1;
}

.banner-content {
    position: relative;
    z-index: 2;
    color: white;
    max-width: 700px;
    animation: fadeInUp 1s ease;
}

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

.banner-title {
    font-size: 3.2rem;
    margin-bottom: 15px;
    line-height: 1.2;
}

.banner-subtitle {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
}

.banner-desc {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
}

.banner-controls {
    position: absolute;
    bottom: 30px;
    left: 0;
    width: 100%;
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: center;
}

.banner-prev, .banner-next {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
    margin: 0 20px;
}

.banner-prev:hover, .banner-next:hover {
    background-color: var(--secondary-color);
}

.banner-dots {
    display: flex;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.4);
    margin: 0 8px;
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background-color: white;
    transform: scale(1.2);
}

/* ===== 公司简介 ===== */
.company-intro {
    position: relative;
    overflow: hidden;
}

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

.intro-text h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.intro-text p {
    margin-bottom: 20px;
    color: var(--text-color);
    line-height: 1.8;
}

.intro-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 20px 10px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.stat-number {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

.intro-image {
    position: relative;
}

.image-frame {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-hover);
}

.image-frame img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.image-frame:hover img {
    transform: scale(1.03);
}

.image-badge {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background-color: var(--accent-color);
    color: white;
    padding: 10px 20px;
    border-radius: 30px;
    display: flex;
    align-items: center;
    font-weight: 600;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.image-badge i {
    margin-right: 8px;
    font-size: 1.2rem;
}

/* ===== 行业解决方案 ===== */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.solution-card {
    position: relative;
    background-color: white;
    border-radius: var(--border-radius);
    padding: 40px 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    overflow: hidden;
    z-index: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.solution-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    font-size: 1.8rem;
    color: white;
}

.solution-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.solution-card p {
    color: var(--text-light);
    margin-bottom: 25px;
    flex-grow: 1;
}

.solution-link {
    display: inline-flex;
    align-items: center;
    color: var(--secondary-color);
    font-weight: 600;
    margin-top: auto;
}

.solution-link i {
    margin-left: 8px;
    transition: var(--transition);
}

.solution-link:hover i {
    transform: translateX(5px);
}

.solution-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0.05;
    z-index: -1;
    transition: var(--transition);
}

.solution-card:hover .solution-bg {
    opacity: 0.1;
}

/* ===== 产品展示 ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.product-card {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.product-image {
    height: 200px;
    overflow: hidden;
    background-color: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

.product-info {
    padding: 25px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-name {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    line-height: 1.3;
}

.product-model {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.product-specs {
    margin-bottom: 15px;
    flex-grow: 1;
}

.product-spec {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.product-spec:last-child {
    border-bottom: none;
}

.spec-label {
    color: var(--text-light);
}

.spec-value {
    color: var(--text-color);
    font-weight: 500;
}

.product-price {
    font-size: 1.4rem;
    color: var(--accent-color);
    font-weight: 700;
    margin-bottom: 20px;
}

.product-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
}

.product-actions .btn {
    flex: 1;
    padding: 10px 15px;
    font-size: 0.9rem;
}

/* ===== 合作伙伴 ===== */
.partners-slider {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 40px;
    padding: 20px 0;
}

.partner-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 150px;
}

.partner-logo img {
    height: 60px;
    width: auto;
    margin-bottom: 15px;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: var(--transition);
}

.partner-logo:hover img {
    filter: grayscale(0%);
    opacity: 1;
}

.partner-name {
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===== 页脚 ===== */
.footer {
    background-color: var(--dark-color);
    color: white;
}

.footer-main {
    padding: 80px 0 50px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

.footer-col h4 {
    color: white;
    font-size: 1.3rem;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.footer-logo .logo-en {
    color: white;
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.footer-logo .logo-cn {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    margin: 20px 0;
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    font-size: 1rem;
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
    display: inline-block;
}

.footer-links a:hover {
    color: white;
    transform: translateX(5px);
}

.contact-info li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
    color: rgba(255, 255, 255, 0.7);
}

.contact-info i {
    margin-right: 12px;
    color: var(--accent-color);
    font-size: 1.1rem;
    margin-top: 3px;
}

.certification {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.cert-badge {
    display: flex;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.05);
    padding: 15px;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-color);
}

.cert-badge i {
    font-size: 1.8rem;
    color: var(--accent-color);
    margin-right: 15px;
}

.cert-badge strong {
    display: block;
    color: white;
    font-size: 1rem;
    margin-bottom: 3px;
}

.cert-badge small {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

.footer-bottom {
    background-color: rgba(0, 0, 0, 0.2);
    padding: 20px 0;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

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

.footer-links-bottom {
    display: flex;
    gap: 20px;
}

.footer-links-bottom a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links-bottom a:hover {
    color: white;
}

/* ===== 页面头部 ===== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--dark-color));
    color: white;
    padding: 100px 0 60px;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 700px;
    margin: 0 auto 30px;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.95rem;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
}

.breadcrumb a:hover {
    color: white;
}

.breadcrumb i {
    margin: 0 10px;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
}

.breadcrumb span {
    color: var(--accent-color);
    font-weight: 600;
}

/* ===== 产品筛选 ===== */
.product-filter {
    background-color: white;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.filter-controls {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-bottom: 30px;
}

.filter-group {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.filter-group label {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 100px;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-btn {
    padding: 8px 20px;
    background-color: white;
    border: 2px solid var(--border-color);
    border-radius: 30px;
    font-weight: 500;
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
}

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

.search-box {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
}

.search-box input {
    flex-grow: 1;
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-right: none;
    border-radius: 30px 0 0 30px;
    font-size: 1rem;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

.search-btn {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 0 30px 30px 0;
    padding: 0 30px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
}

.search-btn:hover {
    background-color: #2980b9;
}

/* ===== 产品展示头部 ===== */
.products-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.products-header h2 {
    color: var(--primary-color);
    margin-bottom: 0;
}

.product-count {
    font-size: 1.1rem;
    color: var(--text-light);
    font-weight: 500;
}

.product-count span:first-child {
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 1.3rem;
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 50px;
    gap: 10px;
}

.pagination-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: white;
    border: 2px solid var(--border-color);
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.pagination-btn.active,
.pagination-btn:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: white;
}

.pagination-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-btn.disabled:hover {
    background-color: white;
    border-color: var(--border-color);
    color: var(--text-color);
}

/* ===== 产品类别 ===== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.category-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 40px 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

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

.category-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2rem;
    color: white;
}

.category-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.category-card p {
    color: var(--text-light);
    margin-bottom: 25px;
}

.category-list {
    text-align: left;
    padding-left: 20px;
}

.category-list li {
    margin-bottom: 10px;
    color: var(--text-color);
    position: relative;
    padding-left: 15px;
}

.category-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--accent-color);
}

/* ===== 模态框 ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1100;
    overflow-y: auto;
    padding: 20px;
}

.modal-content {
    background-color: white;
    max-width: 900px;
    margin: 50px auto;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    animation: modalFadeIn 0.3s ease;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    background-color: var(--primary-color);
    color: white;
}

.modal-header h3 {
    color: white;
    margin-bottom: 0;
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--accent-color);
}

.modal-body {
    padding: 30px;
}

.modal-product-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.modal-product-image {
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 350px;
}

.modal-product-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.modal-product-info h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.modal-product-specs table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 25px;
}

.modal-product-specs tr {
    border-bottom: 1px solid var(--border-color);
}

.modal-product-specs td {
    padding: 12px 0;
}

.modal-product-specs td:first-child {
    font-weight: 600;
    color: var(--text-light);
    width: 40%;
}

.modal-product-description p {
    line-height: 1.7;
    color: var(--text-color);
    margin-bottom: 25px;
}

.modal-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
    .container {
        padding: 0 15px;
    }
    
    .section-padding {
        padding: 60px 0;
    }
    
    .hero-banner {
        height: 500px;
    }
    
    .banner-title {
        font-size: 2.5rem;
    }
    
    .banner-subtitle {
        font-size: 1.3rem;
    }
    
    .intro-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .solutions-grid,
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    .modal-product-details {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.7rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .top-bar-content {
        justify-content: center;
    }
    
    .top-bar-content span {
        margin-bottom: 5px;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: white;
        flex-direction: column;
        align-items: center;
        padding: 40px 0;
        transition: var(--transition);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        z-index: 999;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 0 0 25px 0;
    }
    
    .nav-link {
        font-size: 1.1rem;
        padding: 10px 20px;
    }
    
    .hero-banner {
        height: 400px;
    }
    
    .banner-title {
        font-size: 2rem;
    }
    
    .banner-subtitle {
        font-size: 1.1rem;
    }
    
    .banner-desc {
        font-size: 1rem;
    }
    
    .intro-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .solutions-grid,
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .page-header {
        padding: 80px 0 40px;
    }
    
    .page-header h1 {
        font-size: 2.2rem;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .products-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
}

@media (max-width: 576px) {
    .btn-large {
        padding: 14px 28px;
        font-size: 1rem;
    }
    
    .banner-controls {
        bottom: 15px;
    }
    
    .banner-prev, .banner-next {
        width: 40px;
        height: 40px;
        margin: 0 10px;
    }
    
    .intro-stats {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .product-actions {
        flex-direction: column;
    }
    
    .modal-content {
        margin: 20px auto;
    }
    
    .modal-header,
    .modal-body {
        padding: 20px;
    }
    
    .modal-actions {
        flex-direction: column;
    }
}