:root {
  color-scheme: dark;
  --bg: #05070d;
  --bg-soft: #0a101c;
  --panel: rgba(12, 19, 33, 0.76);
  --text: #f4f7fb;
  --muted: #9aa8bb;
  --line: rgba(255, 255, 255, 0.12);
  --cyan: #36e2ff;
  --green: #8dffb0;
  --pink: #ff72c6;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    linear-gradient(125deg, rgba(54, 226, 255, 0.16), transparent 32%),
    linear-gradient(235deg, rgba(255, 114, 198, 0.14), transparent 30%),
    linear-gradient(180deg, #05070d 0%, #08131f 52%, #070914 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.78), transparent 76%);
}

a {
  color: inherit;
  text-decoration: none;
}

.navbar,
.section,
.footer {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 16px 0;
  backdrop-filter: blur(18px);
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 900;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(54, 226, 255, 0.45);
  border-radius: 8px;
  color: var(--cyan);
  background: rgba(54, 226, 255, 0.08);
  box-shadow: 0 0 28px rgba(54, 226, 255, 0.22);
}

.nav-links {
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(5, 7, 13, 0.58);
}

.nav-links a {
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  transition: color 180ms ease, background 180ms ease;
}

.nav-links a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.72fr);
  gap: 48px;
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: 46px 0 86px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 0;
  font-size: clamp(58px, 10vw, 126px);
  line-height: 0.95;
  letter-spacing: 0;
  background: linear-gradient(90deg, #ffffff, #b9f6ff 48%, #ffd4ef);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  margin: 26px 0 0;
  color: #d9e4ef;
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 800;
}

.intro,
.section-text,
.feature-card p,
.footer {
  color: var(--muted);
  line-height: 1.85;
}

.intro {
  max-width: 650px;
  margin: 22px 0 0;
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover,
.feature-card:hover,
.orbit-card:hover {
  transform: translateY(-4px);
}

.button.primary {
  border-color: rgba(54, 226, 255, 0.5);
  color: #031018;
  background: linear-gradient(135deg, var(--cyan), var(--green));
}

.button.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.orbit-card {
  position: relative;
  overflow: hidden;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.03)),
    repeating-linear-gradient(90deg, rgba(54, 226, 255, 0.08) 0 1px, transparent 1px 22px);
  box-shadow: var(--shadow);
  transition: transform 180ms ease, border-color 180ms ease;
}

.orbit-card::after {
  position: absolute;
  inset: auto 0 0;
  height: 4px;
  content: "";
  background: linear-gradient(90deg, var(--cyan), var(--green), var(--pink));
}

.panel-line {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 18px;
  justify-content: space-between;
  color: var(--muted);
  font-size: 14px;
}

.panel-line strong {
  color: var(--green);
}

.signal-board {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 34px 0;
}

.signal-board span {
  aspect-ratio: 1;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  animation: pulse 2.8s ease-in-out infinite;
}

.signal-board span:nth-child(3n) {
  background: rgba(54, 226, 255, 0.2);
}

.signal-board span:nth-child(4n) {
  animation-delay: 420ms;
  background: rgba(141, 255, 176, 0.16);
}

.terminal-lines {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 10px;
  color: var(--muted);
  font-family: Consolas, "Courier New", monospace;
  font-size: 14px;
}

.terminal-lines span::before {
  color: var(--cyan);
  content: "> ";
}

.about-section {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 48px;
  align-items: start;
  padding: 86px 0;
  border-top: 1px solid var(--line);
}

.section-heading h2 {
  margin-bottom: 0;
  font-size: clamp(30px, 5vw, 48px);
}

.section-text {
  max-width: 760px;
  margin-bottom: 0;
  font-size: 18px;
}

.cards-section {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding: 18px 0 96px;
}

.feature-card {
  min-height: 270px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.feature-card:hover {
  border-color: rgba(54, 226, 255, 0.38);
  background: rgba(16, 27, 45, 0.84);
}

.card-index {
  color: var(--cyan);
  font-weight: 900;
}

.feature-card h2 {
  margin: 68px 0 14px;
  font-size: 24px;
}

.feature-card p {
  margin-bottom: 24px;
}

.feature-card a {
  color: var(--green);
  font-weight: 800;
}

.footer {
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.footer p {
  margin-bottom: 0;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.55;
    transform: scale(1);
  }

  50% {
    opacity: 1;
    transform: scale(1.04);
  }
}

@media (max-width: 860px) {
  .navbar,
  .section,
  .footer {
    width: min(100% - 28px, 680px);
  }

  .menu-button {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 70px;
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border-radius: 8px;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    text-align: center;
  }

  .hero,
  .about-section,
  .cards-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }
}

@media (max-width: 480px) {
  .hero-actions,
  .button {
    width: 100%;
  }

  .orbit-card,
  .feature-card {
    padding: 22px;
  }
}