/* Global Styles */
:root {
    --primary: #1a5f9e;
    --primary-dark: #124a7c;
    --secondary: #f39c12;
    --dark: #1a1a1a;
    --light: #f8f9fa;
    --gray: #6c757d;
    --white: #ffffff;
    --transition: all 0.3s ease;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: #e8e8e8;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 14px;
}

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

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

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

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

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

.btn-white:hover {
    background: var(--light);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow);
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.logo img {
    height: 80px;
    width: auto;
    display: block;
    max-width: 200px;
    object-fit: contain;
}

.nav {
    flex: 1;
    display: flex;
    justify-content: center;
    margin: 0 30px;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-list a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    font-size: 16px;
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
}

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

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    padding: 10px 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    list-style: none;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
}

/* 语言选择器放在最右边 */
.header-actions .language-selector {
    order: 3;
    margin-left: 10px;
}

.header-actions .phone {
    order: 1;
}

.header-actions .btn-primary {
    order: 2;
}

.phone {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    white-space: nowrap;
}

.phone i {
    color: var(--primary);
    font-size: 16px;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

/* Language Selector */
.language-selector {
    position: relative;
    display: inline-flex !important;
    visibility: visible !important;
    opacity: 1 !important;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--white);
    border: 2px solid var(--primary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition);
    min-width: 90px;
    justify-content: center;
}

.lang-toggle:hover {
    background: var(--primary);
    color: var(--white);
}

.lang-flag {
    font-size: 20px;
}

.lang-code {
    font-weight: 600;
    letter-spacing: 0.5px;
}

.lang-toggle i {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.language-selector.open .lang-toggle i {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    padding: 10px;
    min-width: 180px;
    max-height: 320px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.language-selector.open .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    border: none;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    color: var(--dark);
    transition: var(--transition);
    text-align: left;
}

.lang-option:hover {
    background: rgba(26, 95, 158, 0.08);
}

.lang-option.active {
    background: rgba(26, 95, 158, 0.12);
    color: var(--primary);
    font-weight: 600;
}

.lang-option .lang-flag {
    font-size: 22px;
}

.lang-option .lang-name {
    flex: 1;
}

/* Mobile Language Selector */
@media (max-width: 768px) {
    .language-selector {
        margin-right: 10px;
    }
    
    .lang-toggle {
        padding: 8px 12px;
        min-width: auto;
    }
    
    .lang-code {
        display: none;
    }
}

/* Hero Section */
.hero {
    margin-top: 90px;
    position: relative;
}

.hero-slider {
    position: relative;
    height: 600px;
    overflow: hidden;
}

.slide {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: opacity 0.5s;
}

.slide.active {
    opacity: 1;
}

.slide::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
}

.slide-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    padding: 0 20px;
    color: var(--white);
}

.slide-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.slide-content p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

.hero-features {
    background: var(--primary);
    padding: 40px 0;
    color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

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

.feature-item i {
    font-size: 40px;
    margin-bottom: 15px;
    opacity: 0.9;
}

.feature-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 14px;
    opacity: 0.8;
}

/* Section Styles */
section {
    padding: 80px 0;
}

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

.section-subtitle {
    display: inline-block;
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 14px;
    margin-bottom: 10px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark);
}

/* About Section */
.about {
    background: var(--light);
}

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

.about-text p {
    margin-bottom: 20px;
    color: var(--gray);
}

.about-features {
    list-style: none;
    margin: 30px 0;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.about-features i {
    color: var(--primary);
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
}

.experience-badge {
    position: absolute;
    bottom: -20px;
    left: -20px;
    background: var(--secondary);
    color: var(--white);
    padding: 20px 30px;
    border-radius: 10px;
    text-align: center;
}

.experience-badge .years {
    display: block;
    font-size: 36px;
    font-weight: 700;
}

.experience-badge .text {
    font-size: 14px;
}

/* Products Section */
.products-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
}

.product-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.product-image {
    position: relative;
    height: 250px;
    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-overlay {
    position: absolute;
    inset: 0;
    background: rgba(26,95,158,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.product-info p {
    color: var(--gray);
    font-size: 14px;
    margin-bottom: 15px;
}

.product-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

.product-link:hover {
    gap: 10px;
}

/* OEM Section */
.oem {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
}

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

.oem .section-title {
    color: var(--white);
}

.oem-text p {
    opacity: 0.9;
    margin-bottom: 30px;
}

.oem-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.oem-features li {
    display: flex;
    align-items: center;
    gap: 10px;
}

.oem-features i {
    font-size: 24px;
    opacity: 0.9;
}

.oem-image img {
    width: 100%;
    border-radius: 10px;
}

/* Stats Section */
.stats {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--secondary);
}

.stat-suffix {
    font-size: 24px;
    color: var(--secondary);
}

.stat-label {
    font-size: 16px;
    opacity: 0.8;
}

/* Partners Section */
.partners {
    background: var(--light);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 30px;
    align-items: center;
}

.partner-logo {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    font-weight: 700;
    color: var(--gray);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 30px;
}

.contact-item i {
    font-size: 24px;
    color: var(--primary);
    width: 40px;
    height: 40px;
    background: rgba(26,95,158,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-item h4 {
    margin-bottom: 5px;
}

.contact-item p {
    color: var(--gray);
}

.contact-form-wrapper {
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

/* Footer */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 20px;
}

.footer-brand p {
    opacity: 0.8;
    margin-bottom: 20px;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.footer-links h4 {
    margin-bottom: 20px;
    font-size: 18px;
}

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

.footer-links li {
    margin-bottom: 10px;
}

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

.footer-links a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-newsletter p {
    opacity: 0.8;
    margin-bottom: 15px;
}

.newsletter-form {
    display: flex;
}

.newsletter-form input {
    flex: 1;
    padding: 12px 15px;
    border: none;
    border-radius: 6px 0 0 6px;
}

.newsletter-form button {
    padding: 12px 20px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    transition: var(--transition);
}

.newsletter-form button:hover {
    background: var(--primary-dark);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    text-align: center;
    opacity: 0.7;
}

.footer-bottom a {
    color: var(--white);
}

/* Responsive */
@media (max-width: 1200px) {
    .nav-list {
        gap: 25px;
    }
    
    .nav-list a {
        font-size: 15px;
    }
    
    .phone {
        display: none;
    }
}

@media (max-width: 1024px) {
    .features-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .nav {
        margin: 0 20px;
    }
    
    .nav-list {
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .header-actions .phone {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .header-inner {
        height: 70px;
    }
    
    .hero {
        margin-top: 70px;
    }
    
    .slide-content h1 {
        font-size: 32px;
    }
    
    .features-grid,
    .products-grid,
    .stats-grid,
    .partners-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content,
    .oem-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* News Section */
.news {
    background: #fff;
    padding: 80px 0;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-card {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.12);
}

.news-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.news-date {
    position: absolute;
    top: 15px;
    left: 15px;
    background: var(--primary);
    color: #fff;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.news-content {
    padding: 25px;
}

.news-content h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--dark);
    line-height: 1.4;
}

.news-content p {
    color: var(--gray);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 15px;
}

.read-more {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: gap 0.3s;
}

.read-more:hover {
    gap: 10px;
}

@media (max-width: 768px) {
    .news-grid {
        grid-template-columns: 1fr;
    }
}