/* 介绍页共用样式 */
:root {
  --bg: #f3f6fb;
  --card: #ffffff;
  --ink: #152033;
  --muted: #5b6b82;
  --line: #d9e2ef;
  --brand: #1766ff;
  --brand-soft: #e8f0ff;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 64px;
}
.top {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  text-decoration: none;
}
.brand img { width: 36px; height: 36px; border-radius: 8px; }
.nav { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; }
.hero, .card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px 24px;
  margin-bottom: 18px;
}
.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.lead {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}
.cta {
  display: inline-flex;
  margin-top: 18px;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--brand);
  color: #fff !important;
  text-decoration: none !important;
  font-weight: 600;
}
.cta:hover { filter: brightness(1.05); }
h2 {
  margin: 0 0 12px;
  font-size: 22px;
}
ul { margin: 0; padding-left: 1.2em; }
li { margin: 8px 0; color: var(--muted); }
li strong { color: var(--ink); }
.tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 12px;
  font-weight: 600;
}
.foot {
  margin-top: 28px;
  color: var(--muted);
  font-size: 13px;
}
.card > p { margin: 0 0 10px; color: var(--muted); }
.steps { margin: 0; padding-left: 1.2em; color: var(--muted); }
.steps li { margin: 10px 0; }
.faq h3 {
  margin: 18px 0 6px;
  font-size: 17px;
  color: var(--ink);
}
.faq h3:first-child { margin-top: 0; }
.faq p { margin: 0; color: var(--muted); }