/* 第6套 app：分步向导，先选型再下载 */
:root {
  --s6-bg: #eef2ff;
  --s6-ink: #1e1b4b;
  --s6-mute: #4c4878;
  --s6-line: #c7c9f0;
  --s6-violet: #4f46e5;
  --s6-violet-d: #3730a3;
  --s6-paper: #ffffff;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  margin: 0;
  background: var(--s6-bg);
  color: var(--s6-ink);
  font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 16.5px;
  line-height: 1.75;
}
img, svg { max-width: 100%; vertical-align: middle; }
a { color: var(--s6-violet); }
a:hover { color: var(--s6-violet-d); }

.s6-head { background: #fff; }
.s6-inner { max-width: 960px; margin: 0 auto; padding: 0 18px; }
.s6-head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 66px;
}
.s6-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-weight: 800;
  font-size: 19px;
}
.s6-nav a {
  text-decoration: none;
  color: var(--s6-mute);
  margin-left: 12px;
}
.s6-nav a.is-current { color: var(--s6-violet); font-weight: 700; }

.s6-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 20px 0 8px;
}
.s6-step-tab {
  background: #fff;
  border: 1px solid var(--s6-line);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
}
.s6-step-tab b { display: block; color: var(--s6-violet); }

.s6-hero { padding: 10px 0 6px; }
.s6-hero h1 { font-size: 28px; margin: 0 0 12px; }
.s6-panel {
  background: var(--s6-paper);
  border: 1px solid var(--s6-line);
  border-radius: 14px;
  padding: 20px;
  margin: 16px 0;
}
.s6-panel h2 { margin: 0 0 10px; font-size: 21px; }
.s6-num {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--s6-violet);
  color: #fff;
  font-size: 14px;
  margin-right: 8px;
}
.s6-btn {
  display: inline-block;
  background: var(--s6-violet);
  color: #fff;
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 10px;
  font-weight: 700;
}
.s6-btn:hover { background: var(--s6-violet-d); color: #fff; }
.s6-btn-ghost {
  display: inline-block;
  border: 1px solid var(--s6-line);
  color: var(--s6-ink);
  text-decoration: none;
  padding: 10px 16px;
  border-radius: 10px;
}
.s6-faq dt { font-weight: 700; margin-top: 14px; }
.s6-faq dd { margin: 6px 0 0; color: var(--s6-mute); }
.s6-foot {
  padding: 18px 0 36px;
  color: var(--s6-mute);
  font-size: 14px;
}

@media (max-width: 760px) {
  .s6-steps { grid-template-columns: 1fr 1fr; }
  .s6-head-row { flex-wrap: wrap; }
}