:root {
  --bg: #070b16;
  --bg-elev: #0f1730;
  --surface: #121d3d;
  --surface-soft: #172750;
  --text: #e8eeff;
  --muted: #a6b3d9;
  --line: rgba(164, 186, 255, 0.2);
  --brand: #6ca5ff;
  --brand-strong: #4d8eff;
  --accent: #73ffd1;
  --shadow: 0 24px 60px rgba(2, 8, 24, 0.5);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: Inter, -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1000px 480px at 5% -15%, #2b4ea3 0%, transparent 60%),
    radial-gradient(960px 520px at 100% 0%, #1a3a89 0%, transparent 64%),
    var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: min(1140px, 92vw);
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
  z-index: 999;
  background: #fff;
  color: #111;
  padding: 8px 12px;
  border-radius: 10px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
  background: rgba(9, 15, 33, 0.72);
}

.topbar-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: .01em;
}

.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(180deg, #93b9ff, #4d8eff);
  box-shadow: 0 0 0 6px rgba(120, 164, 255, 0.15);
}

.menu {
  display: flex;
  align-items: center;
  gap: 16px;
}

.menu a {
  color: var(--muted);
  text-decoration: none;
  font-size: .93rem;
}

.menu a:hover { color: var(--text); }

.hero {
  padding: 84px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr .88fr;
  gap: 20px;
  align-items: stretch;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 5px 10px;
  font-size: .75rem;
  letter-spacing: .08em;
  border-radius: 999px;
  border: 1px solid rgba(156, 184, 255, 0.45);
  color: #c8d8ff;
  background: rgba(92, 131, 230, 0.22);
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(2.2rem, 4.8vw, 3.7rem);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.hero-lead {
  margin: 0;
  max-width: 760px;
  color: var(--muted);
}

.hero-cta {
  margin-top: 22px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
}

.btn-primary {
  color: #081227;
  background: linear-gradient(180deg, #8cc0ff 0%, #6da6ff 100%);
  box-shadow: 0 10px 24px rgba(69, 123, 223, .35);
}

.btn-outline {
  color: var(--text);
  border-color: var(--line);
  background: rgba(19, 31, 65, 0.6);
}

.hero-panel {
  background: linear-gradient(180deg, rgba(26, 43, 90, .92), rgba(16, 27, 57, .96));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.hero-panel h2 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.hero-panel ul {
  margin: 0;
  padding-left: 1rem;
  color: var(--muted);
}

.metric-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.metric {
  border: 1px solid rgba(176, 199, 255, 0.2);
  border-radius: 12px;
  padding: 10px;
  background: rgba(17, 30, 64, 0.72);
}

.metric span {
  display: block;
  color: #90a4d5;
  font-size: .78rem;
}

.metric strong {
  display: block;
  margin-top: 4px;
  font-size: .9rem;
}

.section {
  padding: 64px 0;
}

.section-head {
  margin-bottom: 18px;
}

.tag {
  margin: 0 0 8px;
  color: #98afe6;
  font-size: .83rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  letter-spacing: -0.01em;
}

.cap-intro {
  margin: 10px 0 0;
  color: var(--muted);
  max-width: 860px;
}

.source-strip {
  margin: 14px 0 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: rgba(18, 30, 64, 0.68);
}

.source-strip p {
  margin: 0;
  color: var(--muted);
}

.source-strip p + p {
  margin-top: 6px;
}

.source-strip a {
  color: #b9d0ff;
  text-decoration: none;
  border-bottom: 1px dashed rgba(185, 208, 255, 0.5);
}

.source-strip a:hover {
  color: #dbe8ff;
  border-bottom-color: rgba(219, 232, 255, 0.8);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.step {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  background: rgba(18, 29, 61, 0.72);
}

.step h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.step p { margin: 0; color: var(--muted); }

.section-dark {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #0a1126 0%, #0c1530 100%);
}

.system-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 14px;
}

.architecture {
  margin: 0;
  border-radius: 14px;
  padding: 16px;
  border: 1px solid rgba(140, 171, 255, 0.25);
  background: rgba(13, 24, 52, 0.85);
  color: #cfddff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: .9rem;
  line-height: 1.65;
  overflow: auto;
}

.compare-card {
  border-radius: 14px;
  border: 1px solid rgba(140, 171, 255, 0.25);
  background: rgba(15, 27, 58, 0.92);
  padding: 16px;
}

.compare-card h3 { margin-top: 0; }
.compare-card dl { margin: 0; display: grid; gap: 10px; }
.compare-card div { display: grid; grid-template-columns: 72px 1fr; gap: 10px; }
.compare-card dt { color: #9cb2ea; font-weight: 600; }
.compare-card dd { margin: 0; color: #d9e5ff; }

.cap-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.cap {
  border-radius: 14px;
  border: 1px solid var(--line);
  padding: 16px;
  background: rgba(16, 27, 56, 0.7);
}

.cap h3 { margin-top: 0; margin-bottom: 8px; }
.cap ul { margin: 0; padding-left: 1rem; color: var(--muted); }

.roadmap {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 10px;
}

.roadmap li {
  border-radius: 12px;
  border: 1px solid var(--line);
  padding: 12px 14px;
  background: rgba(17, 29, 61, 0.74);
}

.roadmap h3 { margin: 0 0 6px; }
.roadmap p { margin: 0; color: var(--muted); }

.section-highlight {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(860px 300px at 8% 10%, rgba(86, 124, 228, .35) 0%, transparent 58%),
    radial-gradient(720px 280px at 92% 90%, rgba(76, 159, 199, .28) 0%, transparent 60%),
    #0c1530;
}

.launch-grid {
  display: grid;
  grid-template-columns: 1fr .95fr;
  gap: 16px;
  align-items: center;
}

.muted { color: var(--muted); }

.code-stack {
  display: grid;
  gap: 10px;
}

.cmd {
  margin: 0;
  border-radius: 12px;
  border: 1px solid rgba(135, 167, 255, 0.3);
  padding: 12px;
  color: #d6e4ff;
  background: rgba(9, 20, 46, 0.9);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  overflow: auto;
}

details {
  border-radius: 12px;
  border: 1px solid var(--line);
  padding: 12px 14px;
  background: rgba(17, 29, 61, 0.72);
  margin-bottom: 10px;
}

summary {
  cursor: pointer;
  font-weight: 600;
}

details p {
  margin-top: 8px;
  margin-bottom: 0;
  color: var(--muted);
}

.footer {
  border-top: 1px solid var(--line);
  background: #060b17;
}

.footer-inner {
  padding: 22px 0 28px;
  color: #8ea5da;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 980px) {
  .menu { display: none; }

  .hero {
    padding: 62px 0 36px;
  }

  .hero-grid,
  .timeline,
  .system-grid,
  .cap-grid,
  .launch-grid,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 42px 0;
  }

  .hero-panel,
  .step,
  .cap,
  .roadmap li,
  details {
    border-radius: 12px;
    padding: 13px;
  }

  .btn {
    width: 100%;
  }

  .hero-cta {
    display: grid;
    grid-template-columns: 1fr;
  }
}