:root {
  --bg: #ffffff;
  --soft: #f8fafd;
  --line: #e9eef6;
  --ink: #0f172a;
  --ink-2: #5a6b84;
  --ink-3: #8b9ab0;
  --blue: #2f6bff;
  --blue-2: #1f56e0;
  --blue-soft: #eef4ff;
  --radius: 10px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.85 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -.01em; line-height: 1.4; }
p { margin: 0; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.wrap--wide { max-width: 960px; }

.top {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 10px;
  height: 60px; padding: 0 24px;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.top img { width: 26px; height: 26px; border-radius: 7px; }
.top__name { font-size: 15px; font-weight: 700; letter-spacing: -.01em; }
.top__name span { font-size: 12px; font-weight: 400; color: var(--ink-3); margin-left: 7px; }
.top__nav { margin-left: auto; display: flex; align-items: center; gap: 18px; font-size: 13.5px; color: var(--ink-2); }
.top__nav a { color: var(--ink-2); }
.top__cta {
  display: inline-flex; align-items: center; height: 34px; padding: 0 14px;
  border-radius: 8px; background: var(--blue); color: #fff; font-size: 13.5px; font-weight: 700;
}
.top__cta:hover { background: var(--blue-2); text-decoration: none; }

.crumb { padding: 26px 0 0; font-size: 12.5px; color: var(--ink-3); }
.crumb a { color: var(--ink-3); }

.art { padding: 14px 0 8px; }
.art h1 { font-size: 30px; letter-spacing: -.02em; }
.art__meta { margin-top: 12px; font-size: 12.5px; color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 14px; }

.answer {
  margin: 26px 0 8px; padding: 18px 20px;
  background: var(--blue-soft); border-left: 3px solid var(--blue); border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15.5px; line-height: 1.85;
}
.answer b { display: block; font-size: 12px; font-weight: 700; color: var(--blue-2); letter-spacing: .08em; margin-bottom: 6px; }

.body { padding: 8px 0 10px; }
.body h2 { font-size: 21px; margin: 38px 0 12px; }
.body h3 { font-size: 16.5px; margin: 24px 0 8px; }
.body p { margin: 12px 0; color: #26334a; }
.body ul, .body ol { margin: 12px 0; padding-left: 22px; color: #26334a; }
.body li { margin: 7px 0; }
.body strong { font-weight: 700; }

.note {
  margin: 18px 0; padding: 14px 16px;
  background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius);
  font-size: 14.5px; color: var(--ink-2);
}

table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--soft); font-weight: 700; color: #1a2436; white-space: nowrap; }

.faqblock { margin: 30px 0 0; }
.faqblock h2 { font-size: 21px; margin-bottom: 12px; }
.qa { border-top: 1px solid var(--line); padding: 16px 0; }
.qa:last-child { border-bottom: 1px solid var(--line); }
.qa h3 { font-size: 15.5px; margin: 0 0 6px; }
.qa p { margin: 0; font-size: 14.5px; color: var(--ink-2); }

.cta {
  margin: 40px 0 10px; padding: 24px;
  border: 1px solid #dbe6f7; border-radius: 12px; background: #fbfcff;
}
.cta h2 { font-size: 18px; margin-bottom: 8px; }
.cta p { font-size: 14px; color: var(--ink-2); margin-bottom: 14px; }
.btn {
  display: inline-flex; align-items: center; height: 40px; padding: 0 18px;
  border-radius: 9px; background: var(--blue); color: #fff; font-size: 14px; font-weight: 700;
}
.btn:hover { background: var(--blue-2); text-decoration: none; }
.btn--ghost { background: #fff; color: var(--blue-2); border: 1px solid #cfdcf3; margin-left: 10px; }

.related { margin: 42px 0 0; }
.related h2 { font-size: 16px; color: var(--ink-2); font-weight: 700; margin-bottom: 12px; }
.related a.item {
  display: block; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: 10px; color: var(--ink);
}
.related a.item:hover { border-color: #cfdcf3; background: #fcfdff; text-decoration: none; }
.related b { display: block; font-size: 15px; }
.related span { display: block; font-size: 13px; color: var(--ink-2); margin-top: 3px; }

footer {
  margin-top: 54px; border-top: 1px solid var(--line); padding: 22px 24px 40px;
  font-size: 12.5px; color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 8px 18px;
  justify-content: center; text-align: center;
}
footer a { color: var(--ink-3); }

.listhead { padding: 40px 0 6px; }
.listhead h1 { font-size: 28px; }
.listhead p { margin-top: 10px; color: var(--ink-2); font-size: 15px; }
.list { padding: 22px 0 0; }
.list a.card {
  display: block; padding: 20px 22px; border: 1px solid var(--line); border-radius: 12px;
  margin-bottom: 12px; color: var(--ink);
}
.list a.card:hover { border-color: #cfdcf3; box-shadow: 0 6px 20px -18px rgba(15,23,42,.4); text-decoration: none; }
.list h2 { font-size: 17px; }
.list p { margin-top: 6px; font-size: 14px; color: var(--ink-2); }
.list .tag { font-size: 12px; color: var(--blue-2); background: var(--blue-soft); padding: 2px 8px; border-radius: 20px; display: inline-block; margin-bottom: 8px; }

@media (max-width: 720px) {
  .art h1 { font-size: 24px; }
  .top__nav a:not(.top__cta) { display: none; }
  .body h2 { font-size: 19px; }
  th, td { font-size: 13px; padding: 9px 8px; }
}