/* === 基础重置 === */
* { 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; color: #0A2540; line-height: 1.7; }

/* === 配色变量 === */
:root {
    --blue: #1E88E5;
    --cyan: #26C6DA;
    --dark: #0A2540;
    --gray: #5A6B7B;
    --light-bg: #F4F8FB;
    --card-border: rgba(38, 198, 218, 0.15);
    --gradient: linear-gradient(135deg, var(--blue), var(--cyan));
}

/* === 容器 === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* === 导航 === */
header { background: #fff; box-shadow: 0 2px 12px rgba(0,0,0,0.06); position: fixed; top: 0; left: 0; right: 0; z-index: 100; }
header nav { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-brand { display: flex; align-items: center; gap: 8px; }
.brand-logo { height: 40px; width: auto; }
.nav-links { list-style: none; display: flex; gap: 28px; }
.nav-links a { text-decoration: none; color: var(--dark); font-size: 14px; transition: color 0.2s; }
.nav-links a:hover { color: var(--cyan); }

/* === Hero区 === */
.hero { margin-top: 64px; background: radial-gradient(ellipse at center, var(--cyan) 0%, var(--blue) 70%); padding: 80px 24px; text-align: center; color: #fff; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.08) 0%, transparent 60%); }
.hero-content { position: relative; z-index: 1; }
.hero h1 { font-size: 42px; font-weight: 700; margin-bottom: 12px; }
.hero-subtitle { font-size: 22px; opacity: 0.9; margin-bottom: 12px; }
.hero-desc { font-size: 14px; opacity: 0.7; margin-bottom: 48px; }
.hero-methods { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 900px; margin: 0 auto; }
.method-card { background: rgba(255,255,255,0.12); backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,0.2); border-radius: 12px; padding: 24px 16px; transition: transform 0.2s; }
.method-card:hover { transform: translateY(-4px); }
.method-card h3 { font-size: 16px; margin-bottom: 8px; }
.method-card p { font-size: 13px; opacity: 0.8; }

/* === 通用板块 === */
.section { padding: 72px 0; }
.section-alt { background: var(--light-bg); }
.section h2 { font-size: 30px; text-align: center; margin-bottom: 12px; }
.section-intro { text-align: center; color: var(--gray); max-width: 680px; margin: 0 auto 48px; font-size: 15px; }

/* === 数据墙 === */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 48px; }
.stat-item { text-align: center; padding: 24px; background: #fff; border-radius: 12px; border: 1px solid var(--card-border); }
.stat-number { display: block; font-size: 28px; font-weight: 700; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.stat-label { font-size: 13px; color: var(--gray); margin-top: 4px; }

/* === 两栏 === */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.two-col h3 { font-size: 18px; margin-bottom: 16px; color: var(--dark); }
.two-col ul { list-style: none; }
.two-col li { padding: 8px 0; padding-left: 20px; position: relative; font-size: 14px; color: var(--gray); line-height: 1.8; }
.two-col li::before { content: ''; position: absolute; left: 0; top: 16px; width: 8px; height: 8px; border-radius: 50%; background: var(--gradient); }

/* === 产品卡片 === */
.products-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.product-card { background: #fff; border-radius: 12px; padding: 32px 28px; border: 1px solid var(--card-border); transition: box-shadow 0.2s; }
.product-card:hover { box-shadow: 0 8px 24px rgba(30, 136, 229, 0.1); }
.product-card h3 { font-size: 18px; margin-bottom: 12px; color: var(--dark); }
.product-card > p { font-size: 14px; color: var(--gray); margin-bottom: 16px; line-height: 1.7; }
.product-card ul { list-style: none; }
.product-card li { padding: 4px 0; padding-left: 18px; position: relative; font-size: 13px; color: var(--gray); }
.product-card li::before { content: '✓'; position: absolute; left: 0; color: var(--cyan); font-weight: 700; }

/* === 解决方案 === */
.solutions-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.solution-card { background: #fff; border-radius: 12px; padding: 32px 28px; border: 1px solid var(--card-border); }
.solution-card h3 { font-size: 18px; margin-bottom: 12px; color: var(--dark); }
.solution-card p { font-size: 14px; color: var(--gray); line-height: 1.7; }

/* === 客户案例 === */
.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.case-item { background: #fff; border-radius: 12px; padding: 28px 24px; border: 1px solid var(--card-border); }
.case-item h3 { font-size: 16px; margin-bottom: 8px; color: var(--dark); }
.case-item p { font-size: 14px; color: var(--gray); }

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: #fff; border-radius: 12px; padding: 24px 28px; margin-bottom: 16px; border: 1px solid var(--card-border); }
.faq-item h3 { font-size: 16px; margin-bottom: 10px; color: var(--dark); }
.faq-item p { font-size: 14px; color: var(--gray); line-height: 1.7; }

/* === 联系我们 === */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 700px; margin: 0 auto; }
.contact-item { background: #fff; border-radius: 12px; padding: 24px; border: 1px solid var(--card-border); text-align: center; }
.contact-item h3 { font-size: 14px; color: var(--gray); margin-bottom: 8px; }
.contact-item p { font-size: 16px; font-weight: 600; color: var(--dark); }

/* === 页脚 === */
footer { background: var(--dark); color: rgba(255,255,255,0.6); padding: 32px 0; text-align: center; }
footer p { font-size: 13px; margin-bottom: 4px; }

/* === 移动端导航按钮 === */
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--dark); padding: 8px; }

/* === 响应式 === */
@media (max-width: 768px) {
    .hero h1 { font-size: 26px; }
    .hero-subtitle { font-size: 18px; }
    .hero-desc { font-size: 12px; }
    .hero-methods { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .method-card { padding: 16px 12px; }
    .method-card h3 { font-size: 14px; }
    .method-card p { font-size: 12px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .stat-item { padding: 16px 12px; }
    .stat-number { font-size: 22px; }
    .two-col { grid-template-columns: 1fr; gap: 32px; }
    .products-grid { grid-template-columns: 1fr; }
    .solutions-grid { grid-template-columns: 1fr; }
    .cases-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .news-sources { gap: 12px; }
    .source-link { min-width: 90px; padding: 12px 16px; }
    .section { padding: 48px 0; }
    .section h2 { font-size: 24px; }
    .container { padding: 0 16px; }
    
    /* 移动端导航 */
    .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px 0; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
    .nav-links.open { display: flex; }
    .nav-links li { padding: 0; }
    .nav-links a { display: block; padding: 12px 24px; font-size: 15px; }
    .nav-toggle { display: block; }
}

/* === 最新动态 === */
.news-sources { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; margin-bottom: 48px; }
.source-link { display: flex; flex-direction: column; align-items: center; gap: 4px; text-decoration: none; color: var(--dark); padding: 16px 24px; background: #fff; border-radius: 12px; border: 1px solid var(--card-border); transition: box-shadow 0.2s; min-width: 120px; }
.source-link:hover { box-shadow: 0 4px 16px rgba(30, 136, 229, 0.12); }
.source-icon { font-size: 28px; }
.source-logo { width: 40px; height: 40px; object-fit: cover; border-radius: 8px; }
.source-name { font-size: 13px; font-weight: 600; }
.source-id { font-size: 11px; color: var(--gray); }

.news-list { max-width: 800px; margin: 0 auto; }
.news-item { background: #fff; border-radius: 12px; padding: 24px 28px; margin-bottom: 16px; border: 1px solid var(--card-border); }
.news-item time { font-size: 12px; color: var(--cyan); font-weight: 600; }
.news-item h3 { font-size: 16px; margin: 8px 0; color: var(--dark); }
.news-item p { font-size: 14px; color: var(--gray); line-height: 1.7; }
.news-source { display: inline-block; font-size: 11px; color: var(--gray); background: var(--light-bg); padding: 2px 8px; border-radius: 4px; margin-top: 8px; }