/* INXEM Smart Lighting 官网样式（无外部字体/CDN，纯静态） */
:root {
  --brand: #0D2750;
  --brand-66: rgba(13, 39, 80, .66);
  --brand-40: rgba(13, 39, 80, .4);
  --brand-08: rgba(13, 39, 80, .08);
  --bg: #F4F6FB;
  --card: #FFFFFF;
  --radius: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--brand);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Microsoft JhengHei",
               Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 24px; }

header.site {
  background: linear-gradient(160deg, #E8EFFA 0%, #F4F6FB 60%, #FFFFFF 100%);
  border-bottom: 1px solid var(--brand-08);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand img { width: 40px; height: 40px; border-radius: 9px; }

.brand .name { font-weight: 700; font-size: 17px; letter-spacing: .2px; }

nav.site a {
  text-decoration: none;
  color: var(--brand-66);
  font-size: 14px;
  margin-left: 18px;
}

nav.site a:hover { color: var(--brand); }

.hero { padding: 72px 0 56px; }

.hero h1 {
  font-size: 40px;
  line-height: 1.25;
  margin: 0 0 16px;
  letter-spacing: -.5px;
}

.hero .lead {
  font-size: 18px;
  color: var(--brand-66);
  max-width: 640px;
  margin: 0 0 28px;
}

.tagline { font-size: 14px; color: var(--brand-40); letter-spacing: 1px; }

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.btn.ghost {
  background: transparent;
  color: var(--brand);
  border: 1px solid var(--brand-40);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  padding: 8px 0 56px;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 6px 22px rgba(13, 39, 80, .06);
}

.card h3 { margin: 0 0 8px; font-size: 16px; }
.card p { margin: 0; color: var(--brand-66); font-size: 14px; }

.section { padding: 48px 0; }
.section h2 { font-size: 24px; margin: 0 0 18px; }

footer.site {
  border-top: 1px solid var(--brand-08);
  padding: 28px 0 48px;
  color: var(--brand-66);
  font-size: 13px;
}

footer.site a { color: var(--brand-66); margin-right: 16px; }

/* 文档页 */
.doc {
  background: var(--card);
  border-radius: var(--radius);
  padding: 36px 40px;
  margin: 32px 0 56px;
  box-shadow: 0 6px 22px rgba(13, 39, 80, .05);
}

.doc h1 { font-size: 26px; margin: 0 0 20px; }
.doc h2 { font-size: 18px; margin: 26px 0 10px; }
.doc p { margin: 0 0 12px; color: #333; font-size: 15px; }

.langbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
}

.langbar button {
  border: 1px solid var(--brand-08);
  background: var(--bg);
  color: var(--brand-66);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
}

.langbar button.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.lang { display: none; }
.lang.active { display: block; }

@media (max-width: 640px) {
  .hero { padding: 48px 0 36px; }
  .hero h1 { font-size: 30px; }
  .doc { padding: 24px 20px; }
  nav.site a { margin-left: 10px; font-size: 13px; }
}