:root {
  --bg: #070b16;
  --bg-2: #10182c;
  --text: #f3fbff;
  --muted: #c5d7e6;
  --cyan: #3df0ff;
  --magenta: #ff2bd6;
  --line: rgba(61, 240, 255, 0.38);
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
}
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.2; font-weight: 800; }
a { color: var(--cyan); }
.wrap {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}
.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  background: #fff;
  color: #07111f;
  padding: 8px 12px;
  z-index: 20;
}
.skip:focus { top: 12px; }

.atmosphere {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(900px 420px at 8% -10%, rgba(255, 43, 214, 0.22), transparent 60%),
    radial-gradient(800px 480px at 100% 0%, rgba(61, 240, 255, 0.18), transparent 55%),
    linear-gradient(180deg, rgba(7, 11, 22, 0.2), rgba(7, 11, 22, 0.72)),
    repeating-linear-gradient(0deg, rgba(61, 240, 255, 0.045) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(90deg, rgba(61, 240, 255, 0.045) 0 1px, transparent 1px 28px);
}
.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(180deg, rgba(255, 255, 255, 0.025) 0 1px, transparent 1px 4px);
  opacity: 0.25;
}
body > :not(.atmosphere) { position: relative; z-index: 1; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(7, 11, 22, 0.86);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 8px 30px rgba(61, 240, 255, 0.08);
}
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 74px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
}
.brand strong, .brand small { display: block; }
.brand strong { font-size: 1.05rem; letter-spacing: 0.04em; }
.brand small { color: var(--muted); font-size: 0.82rem; }
.mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background:
    linear-gradient(135deg, rgba(61, 240, 255, 0.2), rgba(255, 43, 214, 0.25)),
    #0c1426;
  border: 1px solid var(--cyan);
  box-shadow: 0 0 16px rgba(61, 240, 255, 0.45);
  position: relative;
}
.mark::before, .mark::after {
  content: "";
  position: absolute;
  background: var(--magenta);
}
.mark::before { width: 14px; height: 2px; left: 11px; top: 18px; }
.mark::after { width: 2px; height: 14px; left: 17px; top: 12px; background: var(--cyan); }
.nav-links { display: flex; align-items: center; gap: 18px; }
.nav-links a { color: var(--text); text-decoration: none; font-size: 0.98rem; }
.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: rgba(16, 24, 44, 0.9);
  color: var(--text);
  border-radius: 999px;
  min-height: 42px;
  padding: 8px 16px;
  font: inherit;
}

.hero { padding: 64px 0 28px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: center;
}
.kicker {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}
h1 {
  margin-bottom: 16px;
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  text-shadow: 0 0 24px rgba(61, 240, 255, 0.35);
}
h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); margin-bottom: 8px; }
.lead { color: var(--muted); font-size: 1.12rem; max-width: 38rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 26px 0 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 12px 22px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 800;
  color: #041018;
  background: linear-gradient(90deg, var(--cyan), #7af7ff);
  box-shadow: 0 0 24px rgba(61, 240, 255, 0.45);
}
.btn:hover { color: #041018; filter: brightness(1.05); }
.btn-ghost {
  color: var(--text);
  background: transparent;
  border: 1px solid var(--magenta);
  box-shadow: 0 0 18px rgba(255, 43, 214, 0.28);
}
.btn-ghost:hover { color: var(--text); background: rgba(255, 43, 214, 0.12); }
.btn-small { min-height: 40px; padding: 8px 14px; color: #041018; }
.handle { margin: 0; color: var(--magenta); font-weight: 700; letter-spacing: 0.04em; }

.console {
  background: linear-gradient(180deg, rgba(16, 28, 52, 0.92), rgba(8, 12, 24, 0.94));
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 18px 18px 8px;
  box-shadow:
    0 0 0 1px rgba(255, 43, 214, 0.18),
    0 0 40px rgba(61, 240, 255, 0.16),
    inset 0 0 30px rgba(61, 240, 255, 0.05);
}
.console-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.console-top em {
  margin-left: auto;
  font-style: normal;
  color: var(--magenta);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
}
.lights { display: flex; gap: 6px; }
.lights i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: block;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}
.lights i:nth-child(2) { background: var(--magenta); box-shadow: 0 0 8px var(--magenta); }
.console ol { list-style: none; margin: 0; padding: 0; }
.console li {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 14px 0;
  border-top: 1px solid rgba(61, 240, 255, 0.16);
}
.when { color: var(--cyan); font-weight: 800; }
.what { color: var(--text); }
.console b {
  font-size: 0.78rem;
  font-weight: 800;
  color: #041018;
  background: var(--cyan);
  border-radius: 999px;
  padding: 3px 8px;
  box-shadow: 0 0 12px rgba(61, 240, 255, 0.45);
}

.section { padding: 36px 0 72px; }
.section-head { margin-bottom: 22px; max-width: 40rem; }
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card, .steps li {
  background: linear-gradient(180deg, rgba(18, 32, 58, 0.88), rgba(8, 14, 28, 0.92));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.28), inset 0 0 20px rgba(61, 240, 255, 0.04);
}
.card:hover { border-color: var(--magenta); box-shadow: 0 0 24px rgba(255, 43, 214, 0.18); }
.glyph {
  margin: 0 0 10px;
  color: var(--magenta);
  font-weight: 800;
  letter-spacing: 0.08em;
}
.card h3, .steps h3 { margin-bottom: 8px; font-size: 1.15rem; }
.card p, .steps p { margin-bottom: 0; color: var(--muted); }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.steps li { display: flex; gap: 14px; align-items: flex-start; }
.steps span {
  flex: 0 0 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #041018;
  background: var(--cyan);
  font-weight: 800;
  box-shadow: 0 0 16px rgba(61, 240, 255, 0.5);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(5, 8, 16, 0.92);
  padding: 28px 0 36px;
}
.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}
.site-footer p { margin: 6px 0 0; color: var(--muted); }
.site-footer a { color: var(--cyan); font-weight: 700; }

@media (max-width: 900px) {
  .hero-grid, .cards, .steps { grid-template-columns: 1fr; }
  .bar { flex-wrap: wrap; align-items: flex-start; padding: 12px 0; }
  .nav-toggle { display: none; }
  .nav-links {
    display: flex;
    width: 100%;
    flex-wrap: wrap;
    gap: 8px;
    order: 3;
  }
  .nav-links a {
    min-height: 40px;
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
  }
  .hero { padding-top: 32px; }
  .footer-row { flex-direction: column; align-items: flex-start; }
  .console li { grid-template-columns: 64px 1fr; }
  .console b { grid-column: 2; justify-self: start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}