/* 第6套 app：分步向导，先选型再下载 */
html { scroll-behavior: auto; }
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  color: #1e293b;
  background: #f8fafc;
  font: 16.5px/1.8 "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
}
img, svg { max-width: 100%; display: inline-block; vertical-align: middle; }
a { color: #0369a1; }
a:hover { color: #075985; }
:focus-visible { outline: 2px solid #0284c7; outline-offset: 3px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 10px; top: 10px; background: #fff; padding: 8px; z-index: 80; }

.head {
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
}
.head-inner {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex; align-items: center; gap: 8px;
  color: #0f172a; text-decoration: none; font-weight: 800; font-size: 19px;
}
.brand svg { width: 28px; height: 28px; color: #0284c7; }
.nav { display: flex; gap: 16px; }
.nav a { color: #475569; text-decoration: none; font-weight: 700; }
.nav a[aria-current="page"] { color: #0284c7; }

.wizard {
  width: min(860px, calc(100% - 32px));
  margin: 24px auto 48px;
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 0 0 18px;
}
.step-tab {
  background: #fff;
  border: 1px solid #dbe4ee;
  border-radius: 12px;
  padding: 12px 14px;
}
.step-tab b {
  display: block;
  font-size: 12px;
  color: #0284c7;
  margin-bottom: 4px;
}
.card {
  background: #fff;
  border: 1px solid #dbe4ee;
  border-radius: 16px;
  padding: 24px 24px 14px;
  margin: 0 0 16px;
}
.card h1 { margin: 0 0 12px; font-size: 28px; line-height: 1.3; }
.card h2 { margin: 0 0 12px; font-size: 22px; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0 0 12px; }
.chooser {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0;
}
.choice {
  border: 1px solid #dbe4ee;
  border-radius: 12px;
  padding: 14px 14px 8px;
}
.choice h3 { margin-top: 0; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 46px; padding: 0 16px; border-radius: 10px;
  background: #0284c7; color: #fff; text-decoration: none; font-weight: 800;
}
.btn svg { width: 18px; height: 18px; }
.btn:hover { background: #0369a1; color: #fff; }
.btn-ghost {
  display: inline-flex; align-items: center;
  min-height: 46px; padding: 0 16px; border-radius: 10px;
  background: #e0f2fe; color: #075985; text-decoration: none; font-weight: 800;
}
ol.guide { padding-left: 20px; }
ol.guide li { margin: 0 0 10px; }
.faq details { border-top: 1px solid #e2e8f0; padding: 8px 0; }
.faq summary { cursor: pointer; font-weight: 800; }

.foot { background: #0f172a; color: #cbd5e1; padding: 22px 0; font-size: 14px; }
.foot-inner { width: min(860px, calc(100% - 32px)); margin: 0 auto; }
.foot p { margin: 0 0 8px; }

@media (max-width: 720px) {
  .steps, .chooser { grid-template-columns: 1fr; }
  .head-inner { flex-direction: column; align-items: flex-start; padding: 10px 0; gap: 8px; }
  .card h1 { font-size: 24px; }
}