/* ========== Chrome下载站统一样式 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif; background: #f5f7fa; color: #333; line-height: 1.6; }
a { color: #4285F4; text-decoration: none; transition: color 0.2s; }
a:hover { color: #34A853; }

/* 导航栏 */
.navbar { background: white; box-shadow: 0 2px 10px rgba(0,0,0,0.08); position: sticky; top: 0; z-index: 1000; }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; height: 70px; }
.nav-logo { font-size: 1.5em; font-weight: bold; color: #333; display: flex; align-items: center; gap: 10px; }
.nav-logo span { background: linear-gradient(135deg, #4285F4, #34A853); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-menu { display: flex; list-style: none; gap: 5px; }
.nav-menu a { padding: 10px 15px; border-radius: 8px; color: #555; font-weight: 500; white-space: nowrap; }
.nav-menu a:hover, .nav-menu a.active { background: #f0f4ff; color: #4285F4; }
.mobile-menu-btn { display: none; background: none; border: none; font-size: 1.5em; cursor: pointer; }

/* 面包屑 */
.breadcrumb { max-width: 1200px; margin: 15px auto; padding: 0 20px; font-size: 0.9em; color: #666; }
.breadcrumb a { color: #666; }
.breadcrumb a:hover { color: #4285F4; }
.breadcrumb span { margin: 0 6px; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px 40px; }

/* Hero */
.hero { text-align: center; padding: 50px 20px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); border-radius: 20px; margin-bottom: 35px; color: white; }
.hero h1 { font-size: 2.5em; margin-bottom: 12px; }
.hero p { font-size: 1.15em; opacity: 0.92; max-width: 600px; margin: 0 auto 20px; }
.hero-btn { display: inline-block; padding: 14px 36px; background: white; color: #667eea; font-weight: bold; border-radius: 28px; font-size: 1.05em; box-shadow: 0 5px 18px rgba(0,0,0,0.18); }
.hero-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(0,0,0,0.22); color: #667eea; }

/* 标题 */
.section-title { text-align: center; font-size: 2em; margin: 45px 0 10px; color: #333; }
.section-subtitle { text-align: center; color: #666; margin-bottom: 28px; font-size: 1.05em; }

/* 下载卡片 */
.download-section { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; margin-bottom: 35px; }
.download-card { background: white; border-radius: 14px; padding: 28px 18px; text-align: center; box-shadow: 0 4px 16px rgba(0,0,0,0.07); transition: transform 0.3s, box-shadow 0.3s; }
.download-card:hover { transform: translateY(-4px); box-shadow: 0 8px 25px rgba(0,0,0,0.11); }
.platform-icon { font-size: 3em; margin-bottom: 12px; }
.platform-name { font-size: 1.25em; font-weight: bold; margin-bottom: 6px; }
.platform-desc { color: #666; margin-bottom: 14px; font-size: 0.88em; }
.download-btn { display: inline-block; padding: 10px 22px; background: linear-gradient(135deg, #4285F4, #34A853); color: white; border-radius: 18px; font-weight: bold; box-shadow: 0 3px 8px rgba(66,133,244,0.28); }
.download-btn:hover { color: white; box-shadow: 0 5px 12px rgba(66,133,244,0.45); }

/* 内容区块 */
.content-section { background: white; border-radius: 14px; padding: 35px; margin-bottom: 28px; box-shadow: 0 4px 16px rgba(0,0,0,0.07); }
.content-section h2 { font-size: 1.6em; margin-bottom: 18px; color: #333; border-left: 4px solid #4285F4; padding-left: 14px; }
.content-section h3 { font-size: 1.25em; margin: 22px 0 12px; color: #444; }
.content-section p { color: #555; margin-bottom: 12px; line-height: 1.85; }
.content-section ul, .content-section ol { margin: 12px 0; padding-left: 22px; }
.content-section li { margin-bottom: 8px; color: #555; }
.content-section table { width: 100%; border-collapse: collapse; margin: 15px 0; }
.content-section th, .content-section td { padding: 12px 15px; border: 1px solid #e5e7eb; text-align: left; }
.content-section th { background: #f0f4ff; color: #4285F4; font-weight: 600; }

/* 特性网格 */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 22px; margin-bottom: 35px; }
.feature-item { background: white; border-radius: 14px; padding: 28px; text-align: center; box-shadow: 0 4px 16px rgba(0,0,0,0.07); }
.feature-icon { font-size: 2.4em; margin-bottom: 12px; }
.feature-title { font-weight: bold; font-size: 1.08em; margin-bottom: 8px; }
.feature-desc { color: #666; font-size: 0.92em; }

/* FAQ */
.faq-item { background: #f9fafb; border-radius: 10px; padding: 18px; margin-bottom: 12px; }
.faq-question { font-weight: bold; color: #4285F4; margin-bottom: 8px; }
.faq-answer { color: #555; }

/* 文章卡片 */
.related-articles { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; margin-top: 25px; }
.article-card { background: #f9fafb; border-radius: 10px; padding: 18px; transition: transform 0.2s; }
.article-card:hover { transform: translateY(-3px); }
.article-card h4 { margin-bottom: 6px; }
.article-card h4 a { color: #333; }
.article-card p { font-size: 0.88em; color: #666; margin: 0; }

/* 底部 */
.footer { background: white; border-radius: 14px; padding: 28px; text-align: center; box-shadow: 0 4px 16px rgba(0,0,0,0.07); margin-top: 35px; }
.footer-links { margin-bottom: 12px; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.footer-links a { padding: 5px 10px; background: #f0f4ff; border-radius: 6px; font-size: 0.88em; }
.footer-links a:hover { background: #4285F4; color: white; }
.copyright { color: #888; font-size: 0.82em; }

/* 响应式 */
@media (max-width: 768px) {
    .nav-menu { display: none; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0; background: white; padding: 18px; box-shadow: 0 4px 16px rgba(0,0,0,0.1); z-index: 999; }
    .nav-menu.active { display: flex; }
    .mobile-menu-btn { display: block; }
    .hero h1 { font-size: 1.8em; }
    .hero p { font-size: 1em; }
    .download-section { grid-template-columns: repeat(2, 1fr); }
    .content-section { padding: 22px; }
    .section-title { font-size: 1.6em; }
}
@media (max-width: 480px) {
    .download-section { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .related-articles { grid-template-columns: 1fr; }
}