/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

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

/* Header Styles */
.header {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
    animation: rotate 4s linear infinite;
}

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

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

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
}

.search-box input {
    border: none;
    background: none;
    outline: none;
    padding: 0.25rem;
    width: 200px;
}

.search-box button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s ease;
}

.search-box button:hover {
    color: var(--primary-color);
}

/* Button Styles */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn-cart {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.btn-cart:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    overflow: hidden;
    padding-top: 80px; /* 为固定的header留出空间 */
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    background-size: cover;
    background-position: center;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://images.unsplash.com/photo-1581094794329-c8112b5d5ca4?w=1920&h=1080&fit=crop') center/cover;
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    opacity: 0.9;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 1s ease-out 0.6s both;
}

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

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

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

/* Product Categories */
.product-categories {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

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

.category-card {
    position: relative;
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.2;
    z-index: 1;
}

.category-card > * {
    position: relative;
    z-index: 2;
}

/* 直线轴承背景图 */
.category-card:nth-child(1)::before {
    background-image: url('zctp/直线轴承.png');
}

/* 滚珠轴承背景图 */
.category-card:nth-child(2)::before {
    background-image: url('zctp/滚珠轴承.png');
}

/* 直线导轨背景图 */
.category-card:nth-child(3)::before {
    background-image: url('zctp/直线导轨.png');
}

/* 联轴器背景图 */
.category-card:nth-child(4)::before {
    background-image: url('zctp/联轴器.png');
}

/* 滚珠丝杠背景图 */
.category-card:nth-child(5)::before {
    background-image: url('zctp/滚珠丝杠.png');
}

/* 带座轴承背景图 */
.category-card:nth-child(6)::before {
    background-image: url('zctp/带座轴承.png');
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.category-card:hover::before {
    opacity: 0.5;
}

.category-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.category-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    text-shadow: 0 1px 3px rgba(255, 255, 255, 0.8);
}

.category-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.category-count {
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    display: inline-block;
}

/* Featured Products */
.featured-products {
    padding: 5rem 0;
}

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

.product-card {
    background: var(--bg-primary);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.product-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.product-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.product-info {
    padding: 1.5rem;
}

.product-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.product-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.product-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.product-specs span {
    background: var(--bg-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.product-price {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.original-price {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: line-through;
}

/* Solutions Section */
.solutions {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

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

.solution-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s ease;
}

.solution-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.solution-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-color), #dc2626);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.solution-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.solution-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.solution-features {
    list-style: none;
    text-align: left;
    margin-bottom: 2rem;
}

.solution-features li {
    padding: 0.25rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.solution-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* Services Section */
.services {
    padding: 5rem 0;
}

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

.service-item {
    text-align: center;
    padding: 2rem;
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.service-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.service-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* About Section */
.about {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

.about-content {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-text {
    max-width: 900px;
    text-align: center;
    padding: 0 2rem;
}

.about-text .section-title {
    margin-bottom: 1.5rem;
}

.about-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.8;
    text-align: center;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.stat-item {
    text-align: center;
    padding: 1.5rem 1rem;
    background: var(--bg-primary);
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    max-width: 600px;
    margin: 0 auto;
}

.about-features .feature-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 1rem;
    padding: 0.75rem;
    background: var(--bg-primary);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.about-features .feature-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.about-features .feature-item i {
    color: var(--accent-color);
    font-size: 1.5rem;
    flex-shrink: 0;
}

/* Contact Section */
.contact {
    position: relative;
    padding: 6rem 0;
    overflow: hidden;
}

.contact-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
    opacity: 0.5;
    z-index: 0;
}

.contact-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.contact-background::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.contact .container {
    position: relative;
    z-index: 1;
}

.contact-content {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 3rem;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
    max-width: 1200px;
    width: 100%;
}

.info-item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 3rem 2rem;
    background: var(--bg-primary);
    border-radius: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(226, 232, 240, 0.8);
    overflow: hidden;
}

.info-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.info-item:hover::before {
    transform: scaleX(1);
}

.info-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    border-color: rgba(37, 99, 235, 0.2);
}

.info-icon-wrapper {
    position: relative;
    margin-bottom: 2rem;
}

.info-icon {
    position: relative;
    width: 90px;
    height: 90px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
}

.icon-pulse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90px;
    height: 90px;
    border-radius: 50%;
    opacity: 0;
    transition: all 0.4s ease;
}

.info-item:hover .icon-pulse {
    width: 120px;
    height: 120px;
    opacity: 0.3;
}

/* 不同信息项的颜色主题 */
.info-item-location .info-icon {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
}

.info-item-location:hover .info-icon {
    box-shadow: 0 12px 32px rgba(16, 185, 129, 0.4);
    transform: scale(1.1) rotate(5deg);
}

.info-item-location .icon-pulse {
    background: #10b981;
}

.info-item-phone .info-icon {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

.info-item-phone:hover .info-icon {
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4);
    transform: scale(1.1) rotate(-5deg);
}

.info-item-phone .icon-pulse {
    background: #3b82f6;
}

.info-item-email .info-icon {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.3);
}

.info-item-email:hover .info-icon {
    box-shadow: 0 12px 32px rgba(245, 158, 11, 0.4);
    transform: scale(1.1) rotate(5deg);
}

.info-item-email .icon-pulse {
    background: #f59e0b;
}

.info-text {
    width: 100%;
}

.info-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.info-detail {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-size: 1rem;
    line-height: 1.7;
    transition: color 0.3s ease;
}

.info-detail a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.info-detail a:hover {
    color: var(--primary-color);
    transform: translateX(3px);
}

.info-item-location .info-detail a:hover {
    color: #10b981;
}

.info-item-phone .info-detail a:hover {
    color: #3b82f6;
}

.info-item-email .info-detail a:hover {
    color: #f59e0b;
}

.contact-form {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background: var(--bg-primary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 3rem 0 2rem;
}

.footer-content {
    margin-bottom: 2rem;
    text-align: center;
}

.footer-brand {
    max-width: 600px;
    margin: 0 auto;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: white;
}

.footer-logo i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.footer-description {
    color: #94a3b8;
    line-height: 1.7;
    font-size: 0.9375rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid #334155;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.copyright {
    color: #94a3b8;
    font-size: 0.875rem;
    margin: 0;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    transition: color 0.3s ease;
    z-index: 1001;
}

.mobile-menu-toggle:hover {
    color: var(--primary-color);
}

.mobile-menu-toggle i {
    transition: transform 0.3s ease;
}

.mobile-menu-toggle.active i {
    transform: rotate(90deg);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
        position: relative;
    }
    
    .logo {
        flex: 1;
    }
    
    .mobile-menu-toggle {
        display: block;
        order: 2;
    }
    
    .nav {
        display: none;
        width: 100%;
        order: 3;
        padding-top: 1rem;
    }
    
    .nav.active {
        display: block;
        animation: slideDown 0.3s ease-out;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 0;
        background: var(--bg-primary);
        border-radius: 0.5rem;
        overflow: hidden;
        box-shadow: var(--shadow-md);
    }
    
    .nav-list li {
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-list li:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        display: block;
        padding: 1rem;
        width: 100%;
    }
    
    .nav-link.active::after {
        display: none;
    }
    
    .nav-link.active {
        background: var(--bg-secondary);
    }
    
    .header-actions {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .search-box input {
        width: 150px;
    }
    
    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    .hero {
        padding-top: 100px; /* 移动端header可能更高，增加padding */
        padding-bottom: 30px; /* 底部添加适度padding */
    }
    
    .hero-content {
        padding-bottom: 1.5rem; /* 给内容区域添加底部间距 */
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-features {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
        margin-bottom: 1rem; /* 按钮组底部适度间距 */
    }
    
    .about-content {
        padding: 0 1rem;
    }
    
    .about-text {
        padding: 0 1rem;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .contact {
        padding: 4rem 0;
    }
    
    .contact-content {
        padding: 0 1rem;
        margin-top: 2rem;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .info-item {
        padding: 2.5rem 1.5rem;
    }
    
    .info-icon {
        width: 80px;
        height: 80px;
        font-size: 1.75rem;
    }
    
    .info-item:hover .icon-pulse {
        width: 110px;
        height: 110px;
    }
    
    .info-text h3 {
        font-size: 1.375rem;
        margin-bottom: 1rem;
    }
    
    .info-detail {
        font-size: 0.9375rem;
    }
    
    .footer {
        padding: 2.5rem 0 1.5rem;
    }
    
    .footer-content {
        margin-bottom: 1.5rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding-top: 120px; /* 小屏幕增加更多padding */
        padding-bottom: 40px; /* 小屏幕适度底部空间 */
    }
    
    .hero-content {
        padding-bottom: 2rem; /* 小屏幕内容区域适度底部间距 */
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .categories-grid,
    .products-grid,
    .solutions-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .stat-item {
        padding: 1rem;
    }
    
    .contact {
        padding: 3rem 0;
    }
    
    .contact-info {
        gap: 1.5rem;
    }
    
    .info-item {
        padding: 2rem 1.25rem;
    }
    
    .info-icon {
        width: 70px;
        height: 70px;
        font-size: 1.5rem;
    }
    
    .info-item:hover .icon-pulse {
        width: 100px;
        height: 100px;
    }
    
    .info-text h3 {
        font-size: 1.25rem;
    }
    
    .info-detail {
        font-size: 0.875rem;
    }
    
    .footer {
        padding: 2rem 0 1.5rem;
    }
    
    .footer-logo {
        font-size: 1.375rem;
    }
    
    .footer-logo i {
        font-size: 1.5rem;
    }
    
    .footer-description {
        font-size: 0.875rem;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* Success message */
.success-message {
    background: #10b981;
    color: white;
    padding: 1rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
    text-align: center;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}