:root {
  --char: #1c1c1c;
  --orange: #e85d04;
  --amber: #f48c06;
  --bg: #fafafa;
  --panel: #ffffff;
  --muted: #5c5c5c;
  --line: #e6e1db;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--char);
  font-size: 16px;
  line-height: 1.7;
}

.step-head {
  background: var(--char);
  color: #f3f3f3;
  display: flex;
  align-items: stretch;
}
.step-head .brand {
  background: var(--orange);
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.12em;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.step-head nav {
  display: flex;
  align-items: center;
  margin-left: auto;
  padding-right: 18px;
}
.step-head nav a {
  color: #f3f3f3;
  text-decoration: none;
  padding: 18px 16px;
  font-size: 14px;
}
.step-head nav a.is-current { background: #2a2a2a; color: var(--amber); }

.dark-hero {
  background: #111;
  color: #f6f6f6;
  padding: 54px 8vw 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 28px;
  align-items: start;
}
.big-num {
  font-size: 84px;
  line-height: 0.85;
  color: var(--orange);
  font-weight: 800;
}
.dark-hero h1 { font-size: 34px; margin-bottom: 14px; }
.act { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.btn-ora, .btn-dark, .btn-plain {
  text-decoration: none;
  padding: 12px 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-ora { background: var(--orange); color: #fff; font-weight: 700; }
.btn-dark { border: 1px solid #888; color: #fff; }
.btn-plain { background: #fff; color: var(--char); }

.step-frame { padding: 0 0 40px; }
.num-band {
  display: grid;
  grid-template-columns: 120px 1fr;
  border-bottom: 1px solid var(--line);
}
.num-band:nth-child(odd) { background: #fff; }
.num-band:nth-child(even) { background: #f3efe9; }
.num-band .idx {
  font-size: 40px;
  font-weight: 800;
  color: var(--orange);
  padding: 28px 18px;
}
.num-band .txt { padding: 28px 36px 28px 8px; }
.num-band h2 { font-size: 24px; margin-bottom: 10px; }
.num-band p { margin-bottom: 10px; color: #2b2b2b; }
.num-band ol, .num-band ul { margin: 0 0 10px 20px; }

.faq-dark { padding: 36px 8vw; background: var(--char); color: #eee; }
.faq-dark h2 { color: var(--amber); margin-bottom: 16px; }
.faq-dark article { padding: 14px 0; border-top: 1px solid #333; }
.faq-dark h3 { font-size: 17px; margin-bottom: 6px; }

.foot-dark {
  background: #000;
  color: #bdbdbd;
  padding: 26px 8vw 34px;
  font-size: 13px;
  line-height: 1.8;
}
.foot-dark a { color: var(--amber); }

@media (max-width: 800px) {
  .dark-hero, .num-band { grid-template-columns: 1fr; }
  .big-num, .num-band .idx { padding-bottom: 0; }
  .num-band .txt { padding: 8px 20px 24px; }
}