:root {
  --primary: #2563eb; --primary-soft: #eff6ff; --text: #0f172a; --muted: #64748b;
  --border: #e2e8f0; --bg: #f8fafc; --surface: #ffffff;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text); background: var(--bg); line-height: 1.7; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
header { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
nav a { margin-left: 24px; color: var(--muted); font-size: 15px; }
nav a:hover { color: var(--primary); text-decoration: none; }
.hero { padding: 72px 0 48px; text-align: center; background: linear-gradient(180deg, #fff, var(--bg)); }
.hero h1 { font-size: 44px; line-height: 1.25; margin: 0 0 16px; }
.hero h1 span { color: var(--primary); }
.hero p { font-size: 18px; color: var(--muted); max-width: 680px; margin: 0 auto 32px; }
.btn { display: inline-block; padding: 12px 28px; border-radius: 8px; font-size: 16px; font-weight: 600; border: 1px solid var(--primary); }
.btn:hover { text-decoration: none; opacity: .9; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-ghost { background: #fff; color: var(--primary); margin-left: 12px; }
.shot { margin: 48px auto 0; max-width: 1040px; border-radius: 12px; border: 1px solid var(--border); box-shadow: 0 20px 60px rgba(15,23,42,.08); overflow: hidden; background: #fff; }
.shot img { display: block; width: 100%; height: auto; }
section { padding: 64px 0; }
section.alt { background: #fff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
section h2 { font-size: 30px; text-align: center; margin: 0 0 8px; }
.sub { text-align: center; color: var(--muted); margin: 0 0 40px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 24px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card ul { margin: 8px 0 0; padding-left: 20px; color: var(--muted); font-size: 15px; }
.tag { display: inline-block; font-size: 12px; color: var(--primary); background: var(--primary-soft); border-radius: 4px; padding: 2px 8px; margin-bottom: 12px; }
.apps { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 8px; }
.apps span { background: #fff; border: 1px solid var(--border); border-radius: 999px; padding: 6px 16px; font-size: 14px; }
.steps { counter-reset: step; }
.steps .card h3::before { counter-increment: step; content: counter(step); display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; margin-right: 10px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 14px; }
.faq details { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; margin: 0 auto 12px; max-width: 820px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 10px 0 0; color: var(--muted); font-size: 15px; }
.company dl { margin: 0; display: grid; grid-template-columns: 130px 1fr; row-gap: 10px; font-size: 15px; }
.company dt { color: var(--muted); }
.company dd { margin: 0; word-break: break-word; }
.cta { text-align: center; }
.cta p { color: var(--muted); max-width: 640px; margin: 0 auto 24px; }
.doc { max-width: 820px; margin: 0 auto; padding: 48px 20px 64px; }
.doc h1 { font-size: 32px; margin: 0 0 4px; }
.doc .meta { color: var(--muted); font-size: 14px; margin: 0 0 32px; }
.doc h2 { font-size: 20px; margin: 32px 0 8px; }
.doc p, .doc li { font-size: 15px; }
.doc ul { padding-left: 22px; }
footer { background: #0f172a; color: #94a3b8; font-size: 14px; padding: 32px 0; text-align: center; }
footer a { color: #cbd5e1; }
footer p { margin: 4px 0; }
footer .links a { margin: 0 10px; }
@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  nav { display: none; }
}
@media (max-width: 560px) {
  .hero h1 { font-size: 30px; }
  .grid { grid-template-columns: 1fr; }
  .btn-ghost { margin: 12px 0 0; }
  .company dl { grid-template-columns: 1fr; row-gap: 2px; }
  .company dd { margin-bottom: 10px; }
}