/* 网站139 - 仪表盘风格布局 */
:root { --primary: #0891B2; --secondary: #22D3EE; --accent: #67E8F9; --text: #1e293b; --text-light: #64748b; --bg: #f0f9fa; --white: #ffffff; --radius: 4px; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", sans-serif; background: var(--bg); color: var(--text); }
.container { max-width: 1150px; margin: 0 auto; padding: 0 20px; }

/* 头部 */
.header { background: var(--white); border-bottom: 3px solid var(--primary); box-shadow: 0 2px 10px rgba(8,145,178,0.1); }
.navbar { padding: 14px 0; display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 22px; font-weight: 700; color: var(--primary); display: flex; align-items: center; gap: 10px; }
.logo::before { content: '◉'; font-size: 24px; }
.nav-menu { display: flex; gap: 5px; list-style: none; }
.nav-menu a { padding: 10px 16px; color: var(--text); text-decoration: none; border-radius: var(--radius); transition: all 0.2s; font-size: 14px; font-weight: 500; }
.nav-menu a:hover { background: rgba(8,145,178,0.08); color: var(--primary); }
.nav-menu a.active { background: var(--primary); color: var(--white); }

/* 顶部条 */
.top-bar { background: linear-gradient(90deg, var(--primary), var(--secondary)); color: var(--white); padding: 8px 0; font-size: 12px; }
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar a { color: var(--white); text-decoration: none; opacity: 0.9; }

/* 英雄区 */
.hero { background: linear-gradient(135deg, var(--primary), var(--secondary)); padding: 70px 0; color: var(--white); position: relative; }
.hero::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 4px; background: var(--accent); }
.hero h1 { font-size: 34px; margin-bottom: 12px; font-weight: 700; }
.hero p { font-size: 16px; opacity: 0.9; }

/* 功能区 - 4列 */
.features { padding: 50px 0; }
.section-title { text-align: center; font-size: 25px; margin-bottom: 40px; color: var(--text); font-weight: 600; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature-card { background: var(--white); padding: 25px 20px; border-radius: var(--radius); text-align: center; border-left: 4px solid var(--primary); box-shadow: 0 3px 10px rgba(8,145,178,0.08); transition: all 0.3s; }
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(8,145,178,0.15); }
.feature-icon { width: 48px; height: 48px; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 8px; display: flex; align-items: center; justify-content: center; margin: 0 auto 12px; color: var(--white); font-size: 20px; }
.feature-card h3 { font-size: 16px; margin-bottom: 8px; }
.feature-card p { font-size: 13px; color: var(--text-light); line-height: 1.5; }

/* 内容区 */
.content-area { padding: 45px 0; background: var(--white); }
.content-section { padding: 28px; border-radius: var(--radius); margin-bottom: 18px; background: var(--bg); border-left: 4px solid var(--secondary); }
.content-section h2 { font-size: 19px; color: var(--primary); margin-bottom: 10px; }
.content-section p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* CTA */
.cta { background: linear-gradient(135deg, var(--primary), var(--secondary)); padding: 50px 0; text-align: center; color: var(--white); }
.cta h2 { font-size: 25px; margin-bottom: 12px; }
.cta .btn { display: inline-block; padding: 12px 35px; background: var(--white); color: var(--primary); border-radius: var(--radius); font-weight: 600; text-decoration: none; }

/* 底部 */
.footer { background: #0c4a6e; color: var(--white); padding: 42px 0 18px; }
.footer-content { display: grid; grid-template-columns: repeat(3, 1fr); gap: 35px; }
.footer-section h4 { font-size: 15px; margin-bottom: 14px; color: var(--accent); }
.footer-section p { color: #7dd3fc; font-size: 13px; margin-bottom: 7px; }
.footer-bottom { text-align: center; padding-top: 22px; border-top: 1px solid #155e75; color: #67e8f9; font-size: 12px; }

.mobile-toggle { display: none; flex-direction: column: gap: 4px; background: none; border: none; cursor: pointer; }
.mobile-toggle span { width: 22px; height: 2px; background: var(--primary); }

@media (max-width: 1100px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px) {
    .navbar { flex-wrap: wrap; }
    .nav-menu { display: none; width: 100%; flex-direction: column; margin-top: 14px; }
    .nav-menu.active { display: flex; }
    .mobile-toggle { display: flex; }
    .footer-content { grid-template-columns: 1fr; }
    .hero h1 { font-size: 24px; }
}