html {
    scroll-behavior: smooth;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #333;
    line-height: 1.6;
    background-color: #f8f9fa;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* 导航栏 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo img {
    height: 72px;
    vertical-align: middle;
}

.nav a {
    margin-left: 30px;
    font-size: 16px;
    color: #666;
    transition: color 0.3s;
}

.nav a:hover, .nav a.active {
    color: #ff6a00;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin-bottom: 5px;
    border-radius: 2px;
}

/* 首屏区域 */
.hero {
    background: linear-gradient(135deg, #fff 0%, #f0f4ff 100%);
    padding: 80px 0;
    overflow: hidden;
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    max-width: 550px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    color: #666;
    margin-bottom: 40px;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: #ff6a00;
    color: #fff;
    padding: 15px 40px;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 10px 20px rgba(255, 106, 0, 0.2);
}

.btn-download:hover {
    background-color: #e65c00;
    transform: translateY(-2px);
    box-shadow: 0 12px 25px rgba(255, 106, 0, 0.3);
}

.os-icon {
    width: 24px;
    height: 24px;
    margin-right: 10px;
    filter: brightness(0) invert(1);
}

.version-info {
    font-size: 14px;
    color: #999;
    margin-top: 15px;
}

.other-os {
    margin-top: 40px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    font-size: 14px;
    color: #666;
}

.os-link {
    display: flex;
    align-items: center;
    color: #555;
    transition: color 0.3s;
}

.os-link img {
    width: 16px;
    height: 16px;
    margin-right: 5px;
    opacity: 0.7;
}

.os-link:hover {
    color: #ff6a00;
}

.hero-image {
    flex: 1;
    text-align: right;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

/* 特性介绍 */
.features {
    padding: 80px 0;
    background-color: #fff;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    color: #222;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-item {
    text-align: center;
    padding: 30px;
    border-radius: 16px;
    background: #fdfdfd;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    transition: transform 0.3s;
}

.feature-item:hover {
    transform: translateY(-10px);
}

.feature-item img {
    height: 120px;
    object-fit: contain;
    margin-bottom: 25px;
    border-radius: 8px;
}

.feature-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #333;
}

.feature-item p {
    color: #666;
    font-size: 15px;
}

/* 数据展示区域 */
.stats {
    padding: 60px 0;
    background-color: #f8f9fa;
    text-align: center;
}

.stats-grid {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.stat-item h3 {
    font-size: 40px;
    color: #ff6a00;
    margin-bottom: 10px;
}

.stat-item p {
    font-size: 16px;
    color: #666;
}

.stats-desc {
    font-size: 20px;
    color: #333;
    margin-top: 30px;
    font-weight: 600;
}

/* SEO内容专区 */
.seo-content {
    padding: 80px 0;
    background: #fff;
}

.seo-content h2 {
    font-size: 34px;
    color: #1f2937;
    margin-bottom: 24px;
    text-align: center;
}

.seo-content > .container > p {
    max-width: 920px;
    margin: 0 auto 18px;
    color: #555;
    font-size: 17px;
    line-height: 1.9;
}

.keyword-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.keyword-grid article {
    padding: 28px;
    border: 1px solid #f0f0f0;
    border-radius: 16px;
    background: linear-gradient(180deg, #ffffff 0%, #fff8f3 100%);
}

.keyword-grid h3 {
    color: #ff6a00;
    font-size: 22px;
    margin-bottom: 12px;
}

.keyword-grid p {
    color: #666;
    font-size: 15px;
    line-height: 1.8;
}

.faq {
    padding: 80px 0;
    background: #f8f9fa;
}

.faq-list {
    display: grid;
    gap: 18px;
    max-width: 920px;
    margin: 0 auto;
}

.faq-list article {
    padding: 26px 30px;
    border-radius: 16px;
    background: #fff;
    box-shadow: 0 10px 30px rgba(0,0,0,0.04);
}

.faq-list h3 {
    color: #222;
    font-size: 20px;
    margin-bottom: 10px;
}

.faq-list p {
    color: #666;
    font-size: 16px;
    line-height: 1.8;
}

/* 底部CTA */
.bottom-cta {
    background: linear-gradient(90deg, #ff8c00 0%, #ff5500 100%);
    padding: 70px 0;
    text-align: center;
    color: #fff;
}

.bottom-cta h2 {
    font-size: 32px;
    margin-bottom: 30px;
}

.btn-large {
    background-color: #fff;
    color: #ff6a00;
    font-size: 20px;
    padding: 16px 50px;
}

.btn-large:hover {
    background-color: #f8f8f8;
    color: #e65c00;
}

/* 页脚 */
.footer {
    background-color: #222;
    color: #888;
    text-align: center;
    padding: 30px 0;
    font-size: 14px;
}

/* 响应式适配 */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        margin-bottom: 50px;
    }
    
    .other-os {
        justify-content: center;
    }
    
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .keyword-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .seo-content h2 {
        font-size: 28px;
    }
}