/* 第5套：问答驱动 · 宽问窄答 */
:root {
  --bg: #f7f7f5;
  --ink: #111111;
  --red: #c1121f;
  --mute: #5c5c5c;
  --line: #e2e2de;
  --card: #ffffff;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Arial", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
}
a { color: var(--red); }
.mast {
  border-bottom: 8px solid var(--ink);
  background: #fff;
}
.mast-inner {
  width: min(1040px, calc(100% - 36px));
  margin: 0 auto;
  padding: 18px 0 14px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}
.brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  font-size: 26px;
  letter-spacing: -0.03em;
}
.brand span { font-size: 12px; font-weight: 400; color: var(--mute); letter-spacing: 0.14em; }
.nav { display: flex; gap: 22px; }
.nav a {
  text-decoration: none;
  color: var(--ink);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.nav a.active { border-bottom: 3px solid var(--red); }
.hero-slim {
  width: min(1040px, calc(100% - 36px));
  margin: 28px auto 8px;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 36px;
}
h1 { font-size: 36px; line-height: 1.25; letter-spacing: -0.03em; margin-bottom: 12px; }
h2 { font-size: 22px; margin-bottom: 10px; }
.btn {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  padding: 12px 18px;
  font-weight: 700;
}
.btn.red { background: var(--red); }
.side-dl {
  background: var(--ink);
  color: #fff;
  padding: 20px 18px;
}
.side-dl h2 { color: #fff; font-size: 18px; }
.side-dl a { color: #fff; }
.qa-list {
  width: min(1040px, calc(100% - 36px));
  margin: 10px auto 0;
}
.qa {
  display: grid;
  grid-template-columns: 42% 58%;
  gap: 24px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}
.qa h2 { font-size: 24px; }
.band-dark {
  background: var(--ink);
  color: #f2f2f0;
  margin: 20px 0 0;
  padding: 36px 0;
}
.band-dark .inner, .pale .inner {
  width: min(1040px, calc(100% - 36px));
  margin: 0 auto;
}
.band-dark h2 { color: #fff; }
.pale { background: #fff; padding: 32px 0; }
.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.faq {
  width: min(1040px, calc(100% - 36px));
  margin: 0 auto;
  padding: 28px 0 40px;
}
.faq-item { padding: 16px 0; border-bottom: 1px solid var(--line); }
.faq-item h3 { font-size: 18px; margin-bottom: 8px; }
.site-foot {
  background: #111;
  color: #b8b8b4;
  padding: 28px 0;
  font-size: 13px;
}
.site-foot .inner { width: min(1040px, calc(100% - 36px)); margin: 0 auto; }
.site-foot a { color: #fff; }
.safe { color: #ffd166; margin-bottom: 8px; }
@media (max-width: 820px) {
  .hero-slim, .qa, .two { grid-template-columns: 1fr; }
}