:root {
    --primary-color: #1a73e8;
    --primary-dark: #1557b0;
    --secondary-color: #34a853;
    --accent-color: #4285f4;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-light: #80868b;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #1a1a2e;
    --border-color: #e8eaed;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

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

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

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

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

.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: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

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

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

.nav-list a {
    padding: 8px 14px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

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

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

.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 {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

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

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

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

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

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

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

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

.hero-section {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 20px 60px;
    overflow: hidden;
}

.hero-banner {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(26,115,232,0.85) 0%, rgba(26,26,46,0.8) 100%);
}

.hero-content {
    max-width: 900px;
    color: #fff;
    z-index: 1;
    text-align: center;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 24px;
}

.hero-desc {
    font-size: 1.15rem;
    line-height: 1.9;
    opacity: 0.95;
    margin-bottom: 36px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-btns {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-btns .btn-primary {
    background: #fff;
    color: var(--primary-color);
    padding: 14px 32px;
    font-size: 1.05rem;
}

.hero-btns .btn-primary:hover {
    background: var(--bg-secondary);
    color: var(--primary-dark);
}

.hero-btns .btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.6);
    padding: 14px 32px;
    font-size: 1.05rem;
}

.hero-btns .btn-secondary:hover {
    background: rgba(255,255,255,0.15);
    border-color: #fff;
}

.intro-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.download-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.download-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.download-card {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.download-icon {
    display: flex;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 100%);
}

.download-icon img {
    width: 160px;
    height: auto;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.download-info {
    padding: 24px;
}

.download-info h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
}

.download-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.version-info {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 40px;
    margin-bottom: 40px;
}

.version-info h3 {
    font-size: 1.3rem;
    text-align: center;
    margin-bottom: 30px;
}

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

.version-item {
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.version-item h4 {
    font-size: 1rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.version-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.download-notice {
    text-align: center;
    padding: 30px;
    background: #e8f4fd;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

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

.tutorial-section {
    padding: 100px 0;
}

.tutorial-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

.tutorial-banner {
    margin-bottom: 50px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.tutorial-banner img {
    width: 100%;
    display: block;
}

.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 50px;
}

.tutorial-card {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

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

.tutorial-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.tutorial-card h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.tutorial-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.tutorial-cta {
    text-align: center;
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

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

.intro-section h2 {
    font-size: 2rem;
    margin-bottom: 40px;
    text-align: center;
}

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

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

.intro-note {
    padding: 20px;
    background: var(--bg-primary);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
}

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

.products-section {
    padding: 100px 0;
}

.products-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

.section-desc {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 50px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.product-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
}

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

.product-icon {
    margin-bottom: 20px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.product-icon img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.product-card h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.product-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.scenes-section {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.scenes-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

.scenes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-bottom: 50px;
}

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

.scene-card:hover {
    box-shadow: var(--shadow-md);
}

.scene-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.scene-card h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.scene-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.scenes-cta {
    text-align: center;
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

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

.guide-section {
    padding: 100px 0;
}

.guide-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 50px;
}

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

.guide-item {
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.guide-item h3 {
    font-size: 1.2rem;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.guide-item p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.faq-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.faq-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto 50px;
}

.faq-item {
    background: var(--bg-primary);
    margin-bottom: 12px;
    border-radius: var(--radius-sm);
    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;
    transition: var(--transition);
}

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

.faq-toggle {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

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

.faq-answer {
    display: none;
    padding: 0 24px 20px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.faq-item.active .faq-answer {
    display: block;
}

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

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

.safety-section {
    padding: 100px 0;
}

.safety-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

.safety-banner {
    margin-bottom: 50px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.safety-banner img {
    width: 100%;
    display: block;
}

.safety-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
}

.safety-intro p {
    color: var(--text-secondary);
}

.safety-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 50px;
}

.safety-card {
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--accent-color);
}

.safety-card h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.safety-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.safety-topics {
    margin-bottom: 40px;
}

.safety-topic {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}

.safety-topic h3 {
    font-size: 1.15rem;
    margin-bottom: 16px;
}

.safety-topic p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.safety-topic ul {
    margin-left: 20px;
    margin-top: 16px;
}

.safety-topic li {
    color: var(--text-secondary);
    margin-bottom: 10px;
    line-height: 1.7;
}

.safety-tips {
    background: #fff3cd;
    padding: 30px;
    border-radius: var(--radius-md);
    margin-bottom: 30px;
}

.safety-tips h3 {
    margin-bottom: 16px;
    color: #856404;
}

.safety-tips ul {
    margin-left: 20px;
}

.safety-tips li {
    color: #856404;
    margin-bottom: 10px;
    line-height: 1.7;
}

.safety-disclaimer {
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: 30px;
}

.safety-disclaimer h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.safety-disclaimer p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

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

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

.news-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.news-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

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

.news-card {
    background: var(--bg-primary);
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.news-date {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 12px;
}

.news-card h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    line-height: 1.5;
}

.news-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
    line-height: 1.7;
}

.news-link {
    font-size: 0.9rem;
    font-weight: 500;
}

.about-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.about-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
    align-items: start;
    margin-bottom: 40px;
}

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

.about-text {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.about-item {
    padding: 24px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.about-item h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.about-item p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
}

.about-cta {
    text-align: center;
    padding: 30px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

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

.contact-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--bg-dark) 100%);
    color: #fff;
}

.contact-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
}

.contact-section .section-desc {
    color: rgba(255,255,255,0.8);
}

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

.contact-info p {
    color: rgba(255,255,255,0.9);
    margin-bottom: 16px;
    line-height: 1.8;
}

.contact-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

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

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

.contact-btns .btn-secondary {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.5);
}

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

.footer-main {
    text-align: center;
    margin-bottom: 30px;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 16px;
}

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

.footer-desc {
    color: rgba(255,255,255,0.7);
    max-width: 500px;
    margin: 0 auto 16px;
    font-size: 0.9rem;
}

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

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

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 20px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 30px;
}

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

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

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

.footer-bottom p {
    color: rgba(255,255,255,0.5);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

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

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

.back-to-top {
    position: fixed;
    bottom: 60px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    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(-3px);
}

@media (max-width: 1024px) {
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .download-card {
        display: grid;
        grid-template-columns: 200px 1fr;
    }
    
    .version-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tutorial-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
}

@media (max-width: 768px) {
    .header-container {
        height: 60px;
    }
    
    .main-nav .nav-list {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
    }
    
    .main-nav .nav-list.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-section {
        min-height: auto;
        padding: 100px 20px 60px;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .hero-desc {
        font-size: 1rem;
    }
    
    .download-card {
        grid-template-columns: 1fr;
    }
    
    .download-icon {
        padding: 30px;
    }
    
    .download-icon img {
        width: 140px;
    }
    
    .version-grid,
    .tutorial-grid,
    .safety-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .download-section,
    .tutorial-section,
    .about-section,
    .faq-section,
    .safety-section,
    .news-section,
    .contact-section {
        padding: 60px 0;
    }
    
    h2 {
        font-size: 1.5rem !important;
    }
    
    .footer-nav {
        flex-wrap: wrap;
        gap: 15px;
    }
    
    .contact-btns {
        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;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .btn-lg {
        padding: 14px 28px;
        font-size: 1rem;
    }
    
    .product-card,
    .scene-card,
    .guide-item,
    .safety-card,
    .news-card {
        padding: 20px;
    }
    
    .faq-question {
        padding: 16px 20px;
        font-size: 0.95rem;
    }
}