:root {
  --ind: #3730a3;
  --wash: #eef2ff;
  --ink: #1e1b4b;
  --ok: #4338ca;
  --line: #c7d2fe;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font: 16px/1.7 "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--wash);
  color: var(--ink);
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 26px;
  background: var(--ind);
  color: #e0e7ff;
  position: sticky;
  top: 0;
  z-index: 5;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
nav { display: flex; gap: 16px; flex-wrap: wrap; }
nav a {
  color: #c7d2fe;
  text-decoration: none;
  font-size: 14px;
  border-bottom: 2px solid transparent;
}
nav a:hover {
  border-bottom-color: #a5b4fc;
  color: #fff;
}
.hero { padding: 40px 26px 28px; max-width: 980px; }
.hero h1 {
  font-size: 30px;
  line-height: 1.35;
  margin-bottom: 14px;
  color: var(--ind);
}
main > section {
  padding: 28px 26px;
  max-width: 1100px;
  margin: 0 auto;
}
h2 {
  font-size: 22px;
  margin-bottom: 10px;
  color: var(--ind);
}
h3 { font-size: 17px; margin: 8px 0; }
.ba .cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin-top: 18px;
  border: 1px solid var(--line);
}
.before,
.after { padding: 20px; }
.before {
  background: #fff;
  border-right: 1px dashed #a5b4fc;
}
.after { background: #e0e7ff; }
.bubble {
  background: #fff;
  border-radius: 12px 12px 12px 4px;
  padding: 12px;
  margin: 10px 0;
  border: 1px solid var(--line);
}
.bubble.new {
  border-color: var(--ok);
  box-shadow: 0 0 0 3px var(--line);
}
.bubble em {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--ok);
}
.bubble svg { color: var(--ok); margin-bottom: 6px; }
.cards3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 14px;
}
.card {
  background: #fff;
  padding: 16px;
  border-top: 3px solid var(--ind);
}
.card svg { color: var(--ok); }
.card:hover { border-top-width: 5px; }
.tl {
  max-width: 1100px;
  margin: 8px auto 0;
  padding: 0 26px 12px;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.tl li {
  background: #fff;
  padding: 14px;
  border-left: 4px solid var(--ind);
  position: relative;
}
.tl b {
  display: block;
  color: var(--ok);
  margin-bottom: 6px;
}
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  margin-top: 14px;
  font-size: 14px;
}
th, td {
  border: 1px solid var(--line);
  padding: 10px;
  vertical-align: top;
}
th { background: #e0e7ff; color: var(--ind); }
tr:hover td { background: #eef2ff; }
.limit .card { background: var(--wash); }
.faq-dl { background: #fff; padding: 8px 18px 18px; }
.faq-dl dt {
  font-weight: 700;
  margin-top: 16px;
  color: var(--ind);
}
.faq-dl dd {
  margin: 8px 0 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.site-footer {
  padding: 24px 26px;
  background: var(--ind);
  color: #c7d2fe;
  font-size: 13px;
}
.site-footer p { margin: 6px 0; }
@media (max-width: 800px) {
  .ba .cols,
  .cards3,
  .tl { grid-template-columns: 1fr; }
  .before {
    border-right: none;
    border-bottom: 1px dashed #a5b4fc;
  }
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .hero h1 { font-size: 24px; }
}