:root {
  --bg: #12141c;
  --panel: #1b1e2a;
  --cyan: #3dffe8;
  --purple: #7b6cff;
  --text: #e8ebf4;
  --dim: #9aa3b8;
  --line: #2a2f40;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "SF Mono", "Cascadia Code", "Microsoft YaHei", monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
}
p, li, dd, td { font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: var(--cyan); }
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.12em;
}
nav { display: flex; gap: 8px; }
nav a {
  text-decoration: none;
  color: var(--dim);
  border: 1px solid var(--line);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
}
nav a[aria-current="page"] {
  color: #0b0d12;
  background: var(--cyan);
  border-color: var(--cyan);
}

.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 360px;
}
.hero-copy {
  padding: 48px 36px;
  border-right: 1px solid var(--line);
}
.hero-copy h1 {
  font-size: clamp(1.6rem, 2.8vw, 2.15rem);
  line-height: 1.35;
  margin: 10px 0 16px;
}
.label {
  color: var(--purple);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
}
.cta {
  display: inline-block;
  margin-top: 18px;
  background: var(--purple);
  color: #fff;
  text-decoration: none;
  padding: 12px 18px;
  font-weight: 700;
}
.hero-side {
  padding: 48px 36px;
  background: radial-gradient(circle at 80% 20%, rgba(123,108,255,0.25), transparent 40%), var(--panel);
}
.hero-side dt {
  color: var(--cyan);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}
.hero-side dd { margin: 0 0 16px; font-family: inherit; }

.block { padding: 36px 36px 0; max-width: 980px; }
.block h2 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--cyan);
}
.qa {
  background: var(--panel);
  border-left: 3px solid var(--purple);
  padding: 16px 18px;
  margin-bottom: 12px;
}
.qa .q {
  color: #fff;
  font-weight: 700;
  margin-bottom: 8px;
  font-family: inherit;
}
.qa p { color: var(--dim); }
.faq {
  background: transparent;
  border: 1px solid var(--line);
  padding: 12px 14px;
  margin-bottom: 8px;
}
.faq summary { cursor: pointer; color: #fff; }
.faq p { margin-top: 8px; color: var(--dim); }
footer {
  margin-top: 48px;
  padding: 28px 36px 40px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.88rem;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
footer a { margin-right: 14px; }
footer p { margin-top: 8px; }

@media (max-width: 800px) {
  .hero { grid-template-columns: 1fr; }
  .hero-copy { border-right: 0; border-bottom: 1px solid var(--line); }
  .top { flex-direction: column; align-items: flex-start; gap: 12px; }
}