/* ===== 慧象科技 — TDesign 风格主题 ===== */
:root {
  --primary: #0052D9;
  --primary-light: #366EF4;
  --primary-dark: #0034B5;
  --primary-50: #E8F2FF;
  --primary-100: #D4E3FC;
  --success: #00A870;
  --warning: #ED7B2F;
  --danger: #D54941;
  --text-1: #181B25;
  --text-2: #4B5165;
  --text-3: #898D9E;
  --text-4: #BBBFCC;
  --bg: #FFFFFF;
  --bg-1: #F3F3F3;
  --bg-2: #F5F7FA;
  --bg-3: #FAFBFC;
  --border: #DCDCDC;
  --border-light: #E7E7E7;
  --radius: 6px;
  --radius-lg: 12px;
  --shadow-1: 0 1px 10px rgba(0,0,0,0.05);
  --shadow-2: 0 4px 16px rgba(0,82,217,0.08);
  --shadow-3: 0 12px 36px rgba(0,82,217,0.12);
  --max: 1200px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif; color: var(--text-1); background: var(--bg); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* Nav */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.85); backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-light); }
.nav-inner { max-width: var(--max); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; color: var(--text-1); }
.brand-logo { width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; font-size: 16px; box-shadow: var(--shadow-2); }
.nav-menu { display: flex; gap: 36px; }
.nav-menu a { font-size: 14px; color: var(--text-2); font-weight: 500; }
.nav-menu a.active { color: var(--primary); font-weight: 600; }
.nav-cta { display: flex; gap: 12px; align-items: center; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; height: 36px; padding: 0 18px;
  border-radius: var(--radius); font-size: 14px; font-weight: 500; cursor: pointer;
  border: 1px solid transparent; transition: all .2s; white-space: nowrap; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; box-shadow: var(--shadow-2); }
.btn-outline { background: #fff; border-color: var(--border); color: var(--text-1); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { height: 44px; padding: 0 28px; font-size: 15px; }

/* Page header */
.page-header { padding: 140px 24px 80px; text-align: center;
  background: linear-gradient(135deg, #F4F8FF 0%, #EAF1FE 50%, #F0F5FF 100%);
  position: relative; overflow: hidden; }
.page-header::before { content: ''; position: absolute; top: -10%; right: -10%; width: 500px; height: 500px; border-radius: 50%;
  background: radial-gradient(circle, rgba(54,110,244,0.18) 0%, transparent 70%); filter: blur(40px); }
.page-header-inner { position: relative; max-width: var(--max); margin: 0 auto; }
.page-header h1 { font-size: 44px; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 16px;
  background: linear-gradient(135deg, #181B25 0%, #0052D9 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.page-header p { font-size: 17px; color: var(--text-2); max-width: 720px; margin: 0 auto; line-height: 1.7; }

/* Section */
.section { padding: 80px 24px; }
.section-inner { max-width: var(--max); margin: 0 auto; }
.section-head { text-align: center; margin-bottom: 50px; }
.section-tag { display: inline-block; padding: 4px 12px; background: var(--primary-50); color: var(--primary);
  font-size: 12px; font-weight: 600; border-radius: 4px; letter-spacing: 1px; margin-bottom: 16px; }
.section-title { font-size: 34px; font-weight: 700; letter-spacing: -0.5px; }
.section-desc { font-size: 16px; color: var(--text-2); margin-top: 12px; max-width: 600px; margin-left: auto; margin-right: auto; line-height: 1.7; }

/* Footer */
.footer { background: #181B25; color: #BBBFCC; padding: 60px 24px 24px; }
.footer-inner { max-width: var(--max); margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .brand { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 13px; line-height: 1.8; max-width: 320px; }
.footer-col h4 { font-size: 14px; color: #fff; margin-bottom: 16px; font-weight: 600; }
.footer-col li { padding: 5px 0; font-size: 13px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #2A2D3D; padding-top: 24px; text-align: center; font-size: 12px; color: var(--text-3); }
.footer-bottom a { color: var(--text-3); }

@media (max-width: 960px) {
  .nav-menu { display: none; }
  .page-header { padding: 110px 20px 60px; }
  .page-header h1 { font-size: 30px; }
  .section-title { font-size: 26px; }
  .section { padding: 50px 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}