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

:root {
    --primary-color: #1E90FF;
    --primary-dark: #1a7ce0;
    --secondary-color: #00D4AA;
    --text-color: #2c3e50;
    --text-light: #5a6a7a;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #1a1f36;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
    --radius-sm: 8px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

h1, h2, h3, h4 {
    line-height: 1.3;
    font-weight: 600;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    text-align: center;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.section-desc {
    text-align: center;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
}

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

.btn-secondary {
    background: var(--bg-dark);
    color: #fff;
}

.btn-secondary:hover {
    background: #2d3452;
    color: #fff;
}

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

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

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

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-color);
}

.main-nav .nav-list {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 8px;
}

.main-nav .nav-list li a {
    display: block;
    padding: 8px 14px;
    color: var(--text-color);
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.main-nav .nav-list li a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.main-nav .nav-cta {
    background: var(--primary-color) !important;
    color: #fff !important;
}

.main-nav .nav-cta:hover {
    background: var(--primary-dark) !important;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-color);
    transition: all 0.3s ease;
}

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 20px 60px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-bg-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26, 31, 54, 0.85), rgba(30, 144, 255, 0.7));
}

.hero-content {
    text-align: center;
    color: #fff;
    max-width: 800px;
}

.hero-content h1 {
    font-size: 2.8rem;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.95;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.intro-section {
    padding: 80px 0;
    background: var(--bg-light);
}

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

.intro-text p {
    margin-bottom: 1.25rem;
    color: var(--text-light);
}

.intro-image img {
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

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

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.product-card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
}

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

.product-card img {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
}

.product-card p {
    color: var(--text-light);
    margin-bottom: 20px;
    min-height: 72px;
}

.scenes-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.scenes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.scene-card {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
}

.scene-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.scene-card p {
    color: var(--text-light);
}

.scenes-cta {
    text-align: center;
    padding-top: 20px;
}

.scenes-cta p {
    margin-bottom: 20px;
    color: var(--text-light);
}

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

.guide-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
    margin-bottom: 60px;
}

.guide-image img {
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.guide-steps h3 {
    margin-bottom: 1rem;
}

.guide-list {
    list-style: none;
    margin: 20px 0;
}

.guide-list li {
    padding: 12px 0 12px 30px;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.guide-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.guide-list li:last-child {
    border-bottom: none;
}

.guide-note {
    background: var(--bg-light);
    padding: 15px 20px;
    border-radius: var(--radius-sm);
    margin: 20px 0;
    color: var(--text-light);
    font-size: 0.95rem;
}

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

.app-showcase h3 {
    margin-bottom: 30px;
}

.app-slider {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.app-slide img {
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.faq-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto 40px;
}

.faq-item {
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    padding: 18px 50px 18px 24px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    transition: background 0.3s ease;
}

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

.faq-question:after {
    content: "+";
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question:after {
    transform: translateY(-50%) rotate(45deg);
}

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    color: var(--text-light);
}

.faq-item.active .faq-answer {
    padding: 0 24px 20px;
    max-height: 500px;
}

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

.faq-cta p {
    margin-bottom: 20px;
    color: var(--text-light);
}

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

.safety-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.safety-image img {
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.safety-list {
    list-style: none;
    margin: 20px 0;
}

.safety-list li {
    padding: 12px 0;
    padding-left: 28px;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.safety-list li:before {
    content: "⚠";
    position: absolute;
    left: 0;
    color: #f59e0b;
}

.safety-list li:last-child {
    border-bottom: none;
}

.safety-note {
    background: #fef3c7;
    padding: 15px 20px;
    border-radius: var(--radius-sm);
    margin: 20px 0;
    color: #92400e;
    font-size: 0.95rem;
}

.news-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.news-card {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.news-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.news-date {
    font-size: 0.85rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.news-card p {
    color: var(--text-light);
    margin-bottom: 15px;
}

.news-link {
    font-weight: 500;
}

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

.news-cta p {
    margin-bottom: 20px;
    color: var(--text-light);
}

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

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

.about-image img {
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.about-text h2 {
    text-align: left;
    margin-bottom: 1.5rem;
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 1.25rem;
}

.contact-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-dark), #2d3452);
    color: #fff;
}

.contact-section h2 {
    color: #fff;
}

.contact-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-info p {
    opacity: 0.9;
    margin-bottom: 1rem;
}

.contact-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

.site-footer {
    background: var(--bg-dark);
    color: #fff;
    padding: 60px 0 30px;
}

.footer-main {
    display: flex;
    justify-content: space-between;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 350px;
}

.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.footer-brand-name {
    font-size: 1.3rem;
    font-weight: 700;
    margin-left: 10px;
    vertical-align: middle;
}

.footer-desc {
    margin-top: 15px;
    opacity: 0.8;
    font-size: 0.95rem;
}

.footer-nav {
    display: flex;
    gap: 60px;
}

.footer-nav-group h4 {
    margin-bottom: 20px;
    font-size: 1rem;
}

.footer-nav-group ul {
    list-style: none;
}

.footer-nav-group ul li {
    margin-bottom: 12px;
}

.footer-nav-group ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.3s ease;
}

.footer-nav-group ul li a:hover {
    color: #fff;
}

.footer-bottom {
    padding-top: 30px;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

.footer-bottom p {
    margin-bottom: 10px;
}

.footer-update {
    color: rgba(255, 255, 255, 0.6);
}

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

.footer-links {
    margin: 20px 0;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    margin: 0 15px;
}

.footer-links a:hover {
    color: #fff;
}

.footer-icp a {
    color: rgba(255, 255, 255, 0.5);
}

.footer-copyright {
    margin-top: 15px;
    opacity: 0.5;
}

.back-to-top {
    position: fixed;
    bottom: 60px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

@media (max-width: 1024px) {
    .products-grid,
    .scenes-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .intro-content,
    .guide-content,
    .safety-content,
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .intro-image,
    .guide-image,
    .safety-image,
    .about-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-nav .nav-list {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav .nav-list li {
        width: 100%;
    }
    
    .main-nav .nav-list li a {
        padding: 14px 16px;
        border-bottom: 1px solid var(--border-color);
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
    
    .hero-section {
        min-height: auto;
        padding: 120px 20px 80px;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .intro-section,
    .products-section,
    .scenes-section,
    .guide-section,
    .faq-section,
    .safety-section,
    .news-section,
    .about-section,
    .contact-section {
        padding: 60px 0;
    }
    
    .product-card,
    .scene-card,
    .news-card {
        padding: 24px;
    }
    
    .app-slider {
        gap: 12px;
    }
    
    .app-slide img {
        width: 140px;
    }
    
    .footer-main {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-brand {
        max-width: 100%;
    }
    
    .footer-nav {
        justify-content: center;
        flex-wrap: wrap;
        gap: 40px;
    }
    
    .contact-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .back-to-top {
        bottom: 110px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-content h1 {
        font-size: 1.5rem;
    }
    
    .app-slide img {
        width: 120px;
    }
    
    .footer-links a {
        display: block;
        margin: 10px 0;
    }
}