/* 网站131 - 居中简洁布局 */
:root { --primary: #1E40AF; --secondary: #3B82F6; --text: #1e293b; --text-light: #64748b; --bg: #f8fafc; --white: #ffffff; --radius: 12px; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", sans-serif; background: var(--bg); color: var(--text); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 顶部栏 */
.top-bar { background: linear-gradient(90deg, var(--primary), var(--secondary)); color: var(--white); padding: 8px 0; font-size: 13px; }
.top-bar .container { display: flex; justify-content: flex-end; gap: 25px; }
.top-bar a { color: var(--white); text-decoration: none; opacity: 0.9; }
.top-bar a:hover { opacity: 1; }

/* 头部居中布局 */
.header { background: var(--white); box-shadow: 0 2px 10px rgba(0,0,0,0.08); }
.navbar { padding: 20px 0; text-align: center; }
.logo { display: inline-block; font-size: 26px; font-weight: 800; color: var(--white); background: linear-gradient(135deg, var(--primary), var(--secondary)); padding: 12px 30px; border-radius: var(--radius); text-decoration: none; }
.nav-menu { display: flex; justify-content: center; gap: 5px; list-style: none; margin-top: 15px; flex-wrap: wrap; }
.nav-menu a { display: block; padding: 10px 16px; color: var(--text); text-decoration: none; border-radius: 8px; transition: all 0.3s; font-weight: 500; }
.nav-menu a:hover, .nav-menu a.active { background: var(--primary); color: var(--white); }

/* 英雄区 - 居中 */
.hero { background: linear-gradient(135deg, var(--primary), var(--secondary)); padding: 80px 0; text-align: center; color: var(--white); }
.hero h1 { font-size: 38px; margin-bottom: 15px; font-weight: 700; }
.hero p { font-size: 18px; opacity: 0.95; }

/* 功能区 - 卡片网格 */
.features { padding: 60px 0; }
.section-title { text-align: center; font-size: 28px; margin-bottom: 40px; color: var(--text); }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.feature-card { background: var(--white); padding: 30px 25px; border-radius: var(--radius); box-shadow: 0 4px 15px rgba(0,0,0,0.08); text-align: center; transition: all 0.3s; }
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0,0,0,0.12); }
.feature-icon { width: 56px; height: 56px; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin: 0 auto 15px; color: var(--white); font-size: 24px; }
.feature-card h3 { font-size: 18px; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-light); line-height: 1.6; }

/* 内容区 */
.content-area { padding: 50px 0; }
.content-section { background: var(--white); padding: 35px; border-radius: var(--radius); margin-bottom: 20px; box-shadow: 0 4px 15px rgba(0,0,0,0.08); }
.content-section h2 { font-size: 22px; color: var(--primary); margin-bottom: 12px; }
.content-section p { font-size: 15px; color: var(--text-light); line-height: 1.8; }

/* CTA */
.cta { background: linear-gradient(135deg, var(--primary), var(--secondary)); padding: 60px 0; text-align: center; color: var(--white); }
.cta h2 { font-size: 28px; margin-bottom: 12px; }
.cta p { margin-bottom: 20px; }
.cta .btn { display: inline-block; padding: 12px 35px; background: var(--white); color: var(--primary); border-radius: 50px; font-weight: 600; text-decoration: none; }

/* 底部 */
.footer { background: #0f172a; color: var(--white); padding: 50px 0 20px; }
.footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px; margin-bottom: 30px; }
.footer-section h4 { font-size: 16px; margin-bottom: 15px; }
.footer-section p { color: #94a3b8; font-size: 14px; margin-bottom: 8px; }
.footer-bottom { text-align: center; padding-top: 20px; border-top: 1px solid #1e293b; color: #64748b; font-size: 13px; }

/* 汉堡菜单 */
.mobile-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 5px; }
.mobile-toggle span { width: 24px; height: 2px; background: var(--primary); border-radius: 2px; transition: all 0.3s; }

@media (max-width: 768px) {
    .top-bar { display: none; }
    .nav-menu { display: none; flex-direction: column; margin-top: 15px; }
    .nav-menu.active { display: flex; }
    .mobile-toggle { display: flex; }
    .hero { padding: 60px 0; }
    .hero h1 { font-size: 26px; }
}