:root {
  --primary: #1677ff;
  --primary-dark: #0052d4;
  --navy: #0b1e3d;
  --bg: #f4f7fb;
  --text: #1f2733;
  --text-2: #5a6472;
  --border: #e8ecf3;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.topbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 20;
}
.topbar-inner {
  max-width: 1080px; margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--navy); }
.brand img { height: 36px; width: auto; }
.top-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 18px; border-radius: 8px; font-weight: 700; font-size: 14px;
  border: none; cursor: pointer; font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost {
  background: transparent; color: var(--primary);
  border: 1px solid rgba(22,119,255,.35);
}
.hero {
  background:
    linear-gradient(120deg, rgba(11,30,61,.82), rgba(22,119,255,.55)),
    url("/ob-images/logo.png") center/cover no-repeat;
  color: #fff;
  padding: 72px 0 64px;
}
.hero .eyebrow {
  display: inline-block; background: rgba(255,255,255,.16);
  padding: 4px 12px; border-radius: 999px; font-size: 12px; font-weight: 700;
  letter-spacing: .06em; margin-bottom: 14px;
}
.hero h1 { font-size: clamp(28px, 4vw, 42px); line-height: 1.25; margin-bottom: 12px; }
.hero .lead { font-size: 17px; opacity: .95; max-width: 640px; margin-bottom: 24px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-cta .btn-primary { background: #fff; color: var(--primary-dark); }
.hero-cta .btn-ghost { color: #fff; border-color: rgba(255,255,255,.55); }
.section { padding: 56px 0; }
.section h2 { font-size: 26px; margin-bottom: 8px; color: var(--navy); }
.section .sub { color: var(--text-2); margin-bottom: 28px; }
.grid-3 {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.card {
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 22px; box-shadow: 0 8px 24px rgba(11,30,61,.04);
}
.card h3 { font-size: 18px; margin-bottom: 8px; color: var(--navy); }
.card p { color: var(--text-2); font-size: 14px; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.step {
  background: #fff; border-radius: 12px; padding: 18px; border: 1px solid var(--border);
}
.step .n {
  width: 28px; height: 28px; border-radius: 50%;
  background: rgba(22,119,255,.12); color: var(--primary);
  display: grid; place-items: center; font-weight: 800; font-size: 13px; margin-bottom: 10px;
}
.faq details {
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; margin-bottom: 10px;
}
.faq summary { cursor: pointer; font-weight: 700; color: var(--navy); }
.faq p { margin-top: 8px; color: var(--text-2); font-size: 14px; }
.cta-band {
  background: linear-gradient(135deg, #0052d4, #1677ff);
  color: #fff; border-radius: 16px; padding: 36px 28px;
  display: flex; justify-content: space-between; gap: 20px; align-items: center; flex-wrap: wrap;
}
.cta-band h2 { color: #fff; margin: 0 0 6px; font-size: 24px; }
.cta-band p { opacity: .92; margin: 0; }
.form-box {
  background: #fff; border-radius: 14px; border: 1px solid var(--border);
  padding: 24px; box-shadow: 0 10px 28px rgba(11,30,61,.06);
}
.form-box h2 { margin-bottom: 6px; }
.form-box .sub { margin-bottom: 18px; }
.fi { margin-bottom: 12px; }
.fi label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text-2); }
.fi input, .fi textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 8px;
  padding: 11px 12px; font: inherit; color: var(--text); background: #fff;
}
.fi input:focus, .fi textarea:focus { outline: 2px solid rgba(22,119,255,.25); border-color: var(--primary); }
.form-msg { margin-top: 10px; font-size: 14px; color: var(--primary-dark); min-height: 1.2em; }
.related { display: flex; flex-wrap: wrap; gap: 10px; }
.related a {
  background: #fff; border: 1px solid var(--border); border-radius: 999px;
  padding: 8px 14px; font-size: 13px; color: var(--primary-dark); font-weight: 600;
}
.related a:hover { border-color: var(--primary); background: rgba(22,119,255,.06); }
.footer {
  margin-top: 40px; padding: 28px 0; background: var(--navy); color: rgba(255,255,255,.8); font-size: 13px;
}
.footer a { color: #fff; }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
@media (max-width: 860px) {
  .grid-3, .steps { grid-template-columns: 1fr; }
  .hero { padding: 52px 0 44px; }
  #lead-form .wrap { grid-template-columns: 1fr !important; }
}