:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #f59e0b;
  --bg: #f8fafc;
  --text: #1e293b;
  --text-light: #64748b;
  --white: #ffffff;
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; }
body { background: var(--bg); color: var(-ac-text); line-height: 1.6; }
a { text-decoration: none; color: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Navbar */
.navbar { background: var(--white); box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100; }
.nav-container { display: flex; justify-content: space-between; align-items: center; height: 80px; }
.logo { font-size: 24px; font-weight: bold; color: var(--primary); display:flex; align-items:center; gap:10px; }
.logo i { color: var(--accent); }
.nav-links { display: flex; gap: 30px; align-items: center;}
.nav-links a { font-size: 16px; font-weight: 500; transition: color 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.btn { background: var(--primary); color: var(--white); padding: 10px 24px; border-radius: 6px; font-weight: bold; transition: 0.3s; display: inline-block; }
.btn:hover { background: var(--primary-dark); color: var(--white); }

/* Hero */
.hero { background-color: #0f172a; background-blend-mode: overlay; background-size: cover; background-position: center; color: var(--white); padding: 120px 0; text-align: center; }
.hero h1 { font-size: 48px; margin-bottom: 20px; }
.hero p { font-size: 20px; margin-bottom: 40px; color: #cbd5e1; }

/* Section */
.section { padding: 80px 0; }
.section-title { text-align: center; font-size: 32px; margin-bottom: 50px; }
.section-title span { color: var(--primary); }

/* Grid */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 40px; align-items: center; }

/* Card */
.card { background: var(--white); padding: 40px 30px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); transition: transform 0.3s; }
.card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.08); }
.card i { font-size: 40px; color: var(--primary); margin-bottom: 20px; }
.card h3 { font-size: 20px; margin-bottom: 15px; }
.card p { color: var(--text-light); }

/* Footer */
.footer { background: #0f172a; color: #94a3b8; padding: 60px 0 20px; }
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer h4 { color: var(--white); margin-bottom: 20px; font-size: 18px; }
.footer-bottom { text-align: center; border-top: 1px solid #1e293b; padding-top: 20px; font-size: 14px; }