:root {
  color-scheme: dark;
  --bg: #07111f;
  --surface: rgba(17, 34, 53, 0.78);
  --surface-strong: #102337;
  --line: rgba(152, 184, 206, 0.18);
  --text: #f3f7f9;
  --muted: #91a6b7;
  --accent: #73e6cb;
  --accent-blue: #6eaee8;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 20%, rgba(41, 116, 150, 0.22), transparent 30rem),
    radial-gradient(circle at 20% 86%, rgba(38, 105, 91, 0.14), transparent 27rem),
    var(--bg);
  font-family:
    "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.34;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 90%);
}

a {
  color: inherit;
}

.page-shell {
  width: min(calc(100% - 48px), var(--max-width));
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.site-header {
  min-height: 112px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand-mark {
  width: 46px;
  height: 46px;
  color: var(--accent);
  filter: drop-shadow(0 8px 22px rgba(115, 230, 203, 0.17));
}

.brand span {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand strong {
  font-size: 17px;
  letter-spacing: 0.08em;
}

.brand small {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.status i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(115, 230, 203, 0.1);
}

main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 0 64px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(390px, 0.92fr);
  gap: clamp(56px, 9vw, 118px);
  align-items: center;
}

.eyebrow {
  margin: 0 0 25px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
}

h1 {
  margin: 0;
  font-size: clamp(48px, 6vw, 78px);
  line-height: 1.12;
  letter-spacing: -0.055em;
  font-weight: 680;
}

h1 em {
  color: transparent;
  background: linear-gradient(100deg, var(--accent) 3%, var(--accent-blue) 90%);
  background-clip: text;
  -webkit-background-clip: text;
  font-style: normal;
}

.lead {
  margin: 32px 0 0;
  color: #b7c6d1;
  font-size: clamp(17px, 1.65vw, 20px);
  line-height: 1.95;
  letter-spacing: 0.035em;
}

.control-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: linear-gradient(155deg, rgba(19, 43, 65, 0.93), rgba(10, 24, 39, 0.86));
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.28);
}

.control-card::before {
  position: absolute;
  width: 180px;
  height: 180px;
  top: -100px;
  right: -80px;
  border: 1px solid rgba(115, 230, 203, 0.25);
  border-radius: 50%;
  content: "";
  box-shadow:
    0 0 0 28px rgba(115, 230, 203, 0.035),
    0 0 0 56px rgba(115, 230, 203, 0.025);
}

.card-heading {
  min-height: 86px;
  padding: 0 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.11em;
}

.card-heading svg {
  width: 21px;
  stroke: var(--accent);
  stroke-width: 1.7;
  fill: none;
}

.control-grid {
  padding: 8px 30px 14px;
}

.control-grid article {
  min-height: 103px;
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: center;
  gap: 13px;
  border-bottom: 1px solid var(--line);
}

.control-grid article:last-child {
  border-bottom: 0;
}

.index {
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}

.control-grid h2 {
  margin: 0;
  font-size: 19px;
  font-weight: 560;
  letter-spacing: 0.04em;
}

.control-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.principles {
  margin-top: clamp(74px, 9vw, 108px);
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.13em;
}

.principles p {
  margin: 0;
}

.rule {
  height: 1px;
  background: var(--line);
}

.site-footer {
  min-height: 92px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 28px;
  border-top: 1px solid var(--line);
  color: #718697;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: #8ba0b0;
  text-decoration: none;
  text-underline-offset: 4px;
  transition: color 160ms ease;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

@media (max-width: 860px) {
  .page-shell {
    width: min(calc(100% - 36px), var(--max-width));
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 58px;
  }

  .hero-copy {
    max-width: 620px;
  }

  .control-card {
    width: min(100%, 620px);
  }

  .principles {
    margin-top: 74px;
  }
}

@media (max-width: 560px) {
  .page-shell {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .site-header {
    min-height: 92px;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
  }

  .brand strong {
    font-size: 15px;
  }

  .brand small,
  .status {
    display: none;
  }

  main {
    padding: 62px 0 48px;
  }

  h1 {
    font-size: clamp(42px, 14vw, 58px);
  }

  .lead {
    font-size: 16px;
    line-height: 1.8;
  }

  .desktop-break {
    display: none;
  }

  .card-heading {
    min-height: 74px;
    padding: 0 22px;
  }

  .control-grid {
    padding: 4px 22px 10px;
  }

  .control-grid article {
    min-height: 94px;
    grid-template-columns: 32px 1fr;
  }

  .control-grid p {
    display: none;
  }

  .principles {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 58px;
  }

  .principles .rule {
    display: none;
  }

  .site-footer {
    min-height: 110px;
    padding: 24px 0;
    flex-direction: column;
    gap: 9px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}