/* 全局变量与基础重置 */
:root{
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #6b7280;
  --primary: #0a86a1; /* 主色调整为蓝绿色 */
  --accent: #06b6d4;
  --max-width: 1200px;
  --radius: 12px;
  --gap: 24px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.5;
}
.container{
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 16px;
}
/* 导航 */
.nav{
  background:transparent;
  position:sticky;
  top:0;
  z-index:40;
  backdrop-filter:saturate(120%) blur(6px);
}
.nav__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 0;
}
.nav__logo{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:0.4px;color:var(--text);text-decoration:none}
.nav__brand{font-weight:700}
.nav__links{
  display:flex;
  gap:14px;
}
.nav__item{color:var(--muted);text-decoration:none}
.nav__actions{display:flex;align-items:center;gap:10px}
.nav__toggle{display:none;border:0;background:transparent;font-size:20px}
/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 14px;border-radius:8px;border:1px solid transparent;font-weight:600;text-decoration:none;cursor:pointer}
.btn--primary{background:var(--primary);color:white}
.btn--outline{background:transparent;border-color:rgba(15,23,42,0.06);color:var(--text)}
.btn--ghost{background:transparent;color:var(--muted)}
/* Hero */
.hero{padding:56px 0}
.hero__inner{display:grid;grid-template-columns:1fr 460px;gap:32px;align-items:center}
.hero__eyebrow{color:var(--accent);font-weight:600}
.hero__title{font-size:34px;margin:10px 0}
.hero__lead{color:var(--muted);max-width:48ch}
.hero__ctas{display:flex;gap:12px;margin-top:18px}
.hero__media img{width:100%;height:auto;border-radius:16px;box-shadow:0 8px 30px rgba(16,24,40,0.08)}
/* Features */
.features{padding:48px 0}
.section__title{font-size:22px;margin-bottom:6px}
.section__lead{color:var(--muted);margin-bottom:20px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{background:var(--card);padding:20px;border-radius:12px;box-shadow:0 6px 18px rgba(16,24,40,0.04)}
.feature-card__icon{width:48px;height:48px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:white;margin-bottom:12px}
.feature-card__title{margin:0 0 8px 0}
.feature-card__desc{color:var(--muted);margin:0}
/* About */
.about{padding:36px 0}
/* Footer */
.footer{padding-top:40px;background:transparent}
.footer__inner{display:flex;gap:24px;align-items:flex-start;padding-bottom:20px}
.footer__col{flex:1}
.footer__bar{border-top:1px solid rgba(15,23,42,0.04);padding:12px 0;margin-top:12px}
.muted{color:var(--muted)}
/* 联系表单样式 */
.contact{padding:40px 0}
.contact__form{background:var(--card);padding:20px;border-radius:12px;box-shadow:0 6px 18px rgba(16,24,40,0.04)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.form-row.full{grid-column:1/-1}
.form-row label{display:flex;flex-direction:column;font-size:14px;color:var(--text)}
.form-row input,.form-row select,.form-row textarea{margin-top:6px;padding:10px;border-radius:8px;border:1px solid rgba(15,23,42,0.06);font-size:14px}
.form-row textarea{resize:vertical}
.contact .muted{margin-top:8px}
@media (max-width:768px){
  .form-grid{grid-template-columns:1fr}
}
/* Responsive */
@media (max-width: 1024px){
  .hero__inner{grid-template-columns:1fr 360px}
  .grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 768px){
  .nav__links{display:none}
  .nav__toggle{display:inline-block}
  .hero__inner{grid-template-columns:1fr;}
  .hero{padding:36px 0}
  .grid{grid-template-columns:1fr}
  .footer__inner{flex-direction:column}
}