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

:root {
    --primary-color: #3375BB;
    --primary-dark: #2860A0;
    --primary-light: #4A8FD4;
    --secondary-color: #1E3A5F;
    --accent-color: #00D395;
    --text-color: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --bg-color: #FFFFFF;
    --bg-light: #F7F9FC;
    --bg-dark: #1A2332;
    --border-color: #E5E9F0;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

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;
    display: block;
}

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

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 16px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    min-height: 48px;
}

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

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-light);
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}

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

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

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

.btn-small {
    padding: 8px 18px;
    font-size: 14px;
    min-height: 40px;
}

.btn-large {
    padding: 16px 40px;
    font-size: 18px;
    min-height: 56px;
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: var(--secondary-color);
}

.logo:hover {
    color: var(--primary-color);
}

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

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

.main-nav a {
    display: block;
    padding: 8px 14px;
    font-size: 15px;
    color: var(--text-color);
    border-radius: var(--radius-sm);
}

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

.main-nav .nav-cta {
    background: var(--primary-color);
    color: #fff;
    margin-left: 8px;
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-color);
    transition: var(--transition);
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0 60px;
    overflow: hidden;
}

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

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

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,35,50,0.85) 0%, rgba(51,117,187,0.75) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    color: #fff;
}

.hero h1 {
    font-size: 42px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.hero-badges {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 14px;
    opacity: 0.85;
}

.hero-badges span {
    display: flex;
    align-items: center;
    gap: 6px;
}

section {
    padding: 80px 0;
}

section h2 {
    font-size: 32px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 16px;
    color: var(--secondary-color);
}

.section-desc {
    text-align: center;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 48px;
}

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

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

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

.intro-text .btn {
    margin-top: 12px;
}

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

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.product-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-align: center;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.product-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto 20px;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.product-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--secondary-color);
}

.product-card p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.6;
}

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

.scenes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.scene-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    position: relative;
    border: 1px solid var(--border-color);
}

.scene-number {
    position: absolute;
    top: 24px;
    right: 24px;
    font-size: 48px;
    font-weight: 700;
    color: var(--bg-light);
    line-height: 1;
}

.scene-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--secondary-color);
}

.scene-card p {
    color: var(--text-light);
    position: relative;
    z-index: 1;
}

.scenes-cta {
    text-align: center;
    margin-top: 48px;
    padding: 32px;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.scenes-cta p {
    margin-bottom: 16px;
    color: var(--text-light);
}

.guide-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

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

.guide-video {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.guide-video video {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
}

.guide-steps h3 {
    font-size: 22px;
    margin-bottom: 24px;
    color: var(--secondary-color);
}

.steps-list {
    counter-reset: step;
    list-style: none;
}

.steps-list li {
    position: relative;
    padding-left: 48px;
    margin-bottom: 28px;
    counter-increment: step;
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
}

.steps-list strong {
    display: block;
    font-size: 16px;
    margin-bottom: 6px;
    color: var(--secondary-color);
}

.steps-list p {
    font-size: 14px;
    color: var(--text-light);
}

.guide-note {
    margin-top: 32px;
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.guide-note p {
    margin-bottom: 16px;
    color: var(--text-light);
}

.download-options {
    margin-top: 60px;
}

.download-options h3 {
    font-size: 20px;
    text-align: center;
    margin-bottom: 28px;
    color: var(--secondary-color);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.option-item {
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.option-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.option-icon {
    font-size: 32px;
    display: block;
    margin-bottom: 12px;
}

.option-name {
    display: block;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 4px;
}

.option-desc {
    font-size: 13px;
    color: var(--text-muted);
}

.app-showcase {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-dark));
    padding: 80px 0;
    overflow: hidden;
}

.app-showcase h2 {
    color: #fff;
}

.showcase-slider {
    margin-top: 40px;
    overflow: hidden;
}

.showcase-track {
    display: flex;
    gap: 24px;
    animation: scroll 30s linear infinite;
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.showcase-item {
    flex: 0 0 auto;
    width: 240px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.showcase-item img {
    width: 100%;
    height: auto;
}

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

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

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

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    cursor: pointer;
    font-weight: 500;
    color: var(--secondary-color);
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-toggle {
    font-size: 24px;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

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

.faq-answer p {
    padding: 0 24px 24px;
    color: var(--text-light);
    line-height: 1.7;
}

.faq-more {
    text-align: center;
    margin-top: 40px;
}

.faq-more p {
    margin-bottom: 16px;
    color: var(--text-light);
}

.safety-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

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

.safety-tips h3 {
    font-size: 22px;
    margin-bottom: 24px;
    color: var(--secondary-color);
}

.tips-list {
    list-style: none;
}

.tips-list li {
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.tips-list strong {
    display: block;
    margin-bottom: 6px;
    color: var(--secondary-color);
}

.tips-list p {
    font-size: 14px;
    color: var(--text-light);
}

.safety-notice {
    margin-top: 48px;
    padding: 28px;
    background: #FFF9E6;
    border-radius: var(--radius-md);
    border: 1px solid #FFE082;
}

.safety-notice p {
    margin-bottom: 12px;
    font-size: 14px;
    color: #7D6608;
}

.safety-notice p:last-of-type {
    margin-bottom: 16px;
}

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

.news-item {
    display: flex;
    gap: 24px;
    padding: 28px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    transition: var(--transition);
}

.news-item:hover {
    box-shadow: var(--shadow-sm);
}

.news-date {
    flex: 0 0 auto;
    width: 80px;
    text-align: center;
    padding: 12px;
    background: var(--primary-color);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    height: fit-content;
}

.news-content h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.news-content p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.news-content a {
    font-size: 14px;
    font-weight: 500;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

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

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

.contact {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-dark));
}

.contact-box {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    color: #fff;
}

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

.contact-box p {
    opacity: 0.9;
    margin-bottom: 28px;
}

.contact-btns {
    margin-bottom: 24px;
}

.contact-btns .btn-primary {
    background: #fff;
    color: var(--primary-color);
}

.contact-btns .btn-primary:hover {
    background: var(--bg-light);
}

.contact-note {
    font-size: 13px;
    opacity: 0.7;
}

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

.footer-main {
    margin-bottom: 32px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-brand img {
    border-radius: 6px;
}

.footer-desc {
    font-size: 14px;
    opacity: 0.7;
    max-width: 400px;
    margin-bottom: 12px;
}

.footer-cta {
    font-size: 14px;
    opacity: 0.8;
}

.footer-cta a {
    color: var(--accent-color);
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 24px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 24px;
}

.footer-nav a {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
}

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

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

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 16px;
}

.footer-links a {
    color: rgba(255,255,255,0.5);
    font-size: 13px;
}

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

.footer-copyright,
.footer-icp,
.footer-update {
    font-size: 13px;
    opacity: 0.5;
    margin-bottom: 8px;
}

.footer-icp a {
    color: inherit;
}

.footer-icp a:hover {
    color: #fff;
    opacity: 1;
}

.back-to-top {
    position: fixed;
    bottom: 60px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

@media (max-width: 1024px) {
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .options-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@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-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav a {
        padding: 14px 16px;
        border-bottom: 1px solid var(--border-color);
    }
    
    .main-nav .nav-cta {
        margin: 16px 0 0;
        text-align: center;
    }
    
    .hero {
        min-height: auto;
        padding: 120px 0 80px;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-btns {
        flex-direction: column;
    }
    
    .hero-btns .btn {
        width: 100%;
    }
    
    section {
        padding: 60px 0;
    }
    
    section h2 {
        font-size: 26px;
    }
    
    .intro-grid,
    .guide-content,
    .safety-content,
    .about-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .intro-image {
        order: -1;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .scenes-grid {
        grid-template-columns: 1fr;
    }
    
    .options-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-item {
        flex-direction: column;
        gap: 16px;
    }
    
    .news-date {
        width: auto;
        display: inline-block;
    }
    
    .back-to-top {
        bottom: 110px;
        right: 16px;
    }
    
    .showcase-item {
        width: 180px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero h1 {
        font-size: 24px;
    }
    
    .hero-badges {
        flex-direction: column;
        gap: 12px;
    }
    
    section h2 {
        font-size: 22px;
    }
    
    .product-card,
    .scene-card {
        padding: 20px;
    }
    
    .faq-question {
        padding: 16px;
        font-size: 15px;
    }
    
    .faq-answer p {
        padding: 0 16px 16px;
        font-size: 14px;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-nav {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
}