* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #f3f4f6;
  color: #111827;
  font-family: Arial, Helvetica, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: #155eef;
}

a:hover {
  color: #0b4cc8;
}

img,
svg {
  vertical-align: middle;
}

.top {
  background: #fff;
  border-bottom: 1px solid #d1d5db;
}

.top-in {
  max-width: 1080px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  color: #111827;
  text-decoration: none;
  font-weight: 700;
  font-size: 16px;
}

.nav {
  display: flex;
  gap: 16px;
}

.nav a {
  color: #111827;
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}

.nav a[aria-current="page"] {
  color: #155eef;
  border-bottom-color: #155eef;
  font-weight: 700;
}

.shell {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 16px;
  max-width: 1080px;
  margin: 16px auto 24px;
  padding: 0 16px;
  align-items: start;
}

.hero {
  background: #fff;
  border: 1px solid #d1d5db;
  padding: 14px 16px 16px;
  margin: 0 0 12px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.3;
  font-weight: 700;
}

.hero p {
  margin: 0 0 12px;
}

.hero .cta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.q {
  background: #fff;
  border: 1px solid #d1d5db;
  border-left: 6px solid #155eef;
  padding: 12px 14px 14px;
  margin: 0 0 12px;
}

.q h2,
.faq h2 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.35;
  font-weight: 700;
}

.q p,
.faq p {
  margin: 0 0 8px;
}

.q p:last-child,
.faq p:last-child,
.faq .qa:last-child {
  margin-bottom: 0;
}

.faq {
  background: #fff;
  border: 1px solid #d1d5db;
  padding: 12px 14px 14px;
  margin: 0;
}

.qa {
  border-left: 6px solid #155eef;
  padding: 8px 0 8px 12px;
  margin: 0 0 10px;
}

.qa h3 {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.4;
  font-weight: 700;
}

.rail {
  position: sticky;
  top: 12px;
  background: #fff;
  border: 1px solid #d1d5db;
  padding: 12px;
}

.rail .rh {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.35;
  font-weight: 700;
}

.rail p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.45;
  color: #374151;
}

.rail .stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: #155eef;
  color: #fff;
  text-decoration: none;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid #155eef;
}

.btn:hover {
  background: #0b4cc8;
  color: #fff;
}

.btn-win {
  min-height: 40px;
}

.btn-alt {
  background: #fff;
  color: #155eef;
}

.btn-alt:hover {
  background: #eff4ff;
  color: #0b4cc8;
}

.foot {
  background: #fff;
  border-top: 1px solid #d1d5db;
  padding: 12px 16px 16px;
}

.foot-in {
  max-width: 1080px;
  margin: 0 auto;
  font-size: 13px;
  line-height: 1.45;
  color: #374151;
}

.foot p {
  margin: 0 0 6px;
}

.foot p:last-child {
  margin-bottom: 0;
}

@media (max-width: 880px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .rail {
    position: static;
  }

  .top-in {
    flex-wrap: wrap;
  }
}