* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: #f0f9ff;
  color: #0f172a;
  line-height: 1.72;
}
a { color: #0369a1; }

.st-header {
  background: #0c4a6e;
  color: #e0f2fe;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 12px rgba(12, 74, 110, 0.25);
}
.st-header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.st-logo { font-size: 20px; font-weight: 800; }
.st-nav { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; }
.st-nav a { color: #bae6fd; text-decoration: none; font-weight: 600; }
.st-nav a:hover { color: #fff; }
.st-btn {
  display: inline-block;
  background: #0284c7;
  color: #fff !important;
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 14px;
  border: none;
  cursor: pointer;
}
.st-wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px 48px; }
.st-hero {
  background: #fff;
  border: 1px solid #bae6fd;
  border-radius: 16px;
  padding: 36px 28px;
  margin: 28px 0;
  text-align: center;
}
.st-hero h1 { margin: 0 0 14px; font-size: clamp(26px, 4vw, 38px); color: #0c4a6e; }
.st-lead { color: #475569; font-size: 18px; max-width: 680px; margin: 0 auto 20px; }
.st-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.st-card {
  background: #fff;
  border: 1px solid #e0f2fe;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.06);
}
.st-card h2 { margin-top: 0; font-size: 18px; color: #0c4a6e; }
.st-section {
  background: #fff;
  border-radius: 12px;
  padding: 26px 28px;
  margin-bottom: 18px;
  border: 1px solid #e0f2fe;
}
.st-section h2 { color: #0c4a6e; margin-top: 0; }
.st-crumb { font-size: 14px; color: #64748b; margin-bottom: 8px; }
.st-page h1 { color: #0c4a6e; }
.st-faq details { border-top: 1px solid #e2e8f0; padding: 12px 0; }
.st-faq summary { font-weight: 600; cursor: pointer; }
.st-tip {
  background: #ecfeff;
  border-left: 4px solid #06b6d4;
  padding: 14px 18px;
  margin: 16px 0;
  border-radius: 0 8px 8px 0;
}
.st-foot {
  text-align: center;
  padding: 28px 20px;
  color: #64748b;
  font-size: 14px;
  border-top: 1px solid #cbd5e1;
  margin-top: 24px;
}
.st-foot a { margin: 0 8px; }