:root {
  --bg: #111318;
  --panel: #1a1d24;
  --ink: #e8edf5;
  --muted: #9aa6b8;
  --blue: #3d8bfd;
  --line: #2a3140;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Consolas", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 15px;
}

.frame {
  width: min(1080px, calc(100% - 24px));
  margin: 0 auto;
}

.top {
  display: grid;
  grid-template-columns: 220px 1fr;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 8px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  background: #0d0f14;
}
nav { display: flex; align-items: stretch; }
nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 16px 18px;
  border-left: 1px solid var(--line);
  font-size: 13px;
}
nav a.current { color: #fff; background: #243049; box-shadow: inset 0 -2px 0 var(--blue); }

.hero {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 0;
  border: 1px solid var(--line);
  border-top: 0;
  background: var(--panel);
}
.hero-text { padding: 32px 28px; }
.hero h1 { font-size: 26px; line-height: 1.4; margin-bottom: 12px; }
.hero .lead { color: var(--muted); margin-bottom: 16px; }
.btn {
  display: inline-block;
  background: var(--blue);
  color: #081018;
  text-decoration: none;
  padding: 10px 14px;
  font-weight: 800;
  margin: 0 8px 8px 0;
}
.btn-dim {
  background: transparent;
  color: var(--blue);
  border: 1px solid var(--blue);
}
.hero-side {
  background: #151821;
  padding: 24px;
  border-left: 1px solid var(--line);
}
.hero-side a { color: var(--blue); display: block; margin: 8px 0; }

.qa {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-top: 0;
}
.qa article {
  background: var(--panel);
  padding: 22px 20px;
}
.qa h2 {
  font-size: 17px;
  color: var(--blue);
  margin-bottom: 10px;
}
.qa p { color: #d5dbe6; margin-bottom: 10px; }
.qa ul { margin: 0 0 8px 18px; color: #c9d2e0; }

.wide {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 0;
  padding: 24px 22px;
}
.wide h2 { color: var(--blue); font-size: 18px; margin-bottom: 10px; }
p { margin-bottom: 10px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 14px;
  font-size: 13.5px;
}
th, td { border: 1px solid var(--line); padding: 8px; text-align: left; }
th { background: #243049; color: #fff; }

.faq { padding: 8px 0 0; }
.faq dt { color: #fff; font-weight: 700; margin-top: 12px; }
.faq dd { color: var(--muted); margin: 4px 0 0; }

footer {
  border: 1px solid var(--line);
  border-top: 0;
  padding: 18px 16px 28px;
  color: var(--muted);
  font-size: 12px;
  background: #0d0f14;
  margin-bottom: 24px;
}
.safe { color: #7eb6ff; }

@media (max-width: 800px) {
  .top, .hero, .qa { grid-template-columns: 1fr; }
  nav { flex-wrap: wrap; }
}