:root {
  --background: #070b0d;
  --surface: #0d1417;
  --foreground: #e9f1ef;
  --muted: #9aa9a6;
  --accent: #47ddbd;
  --accent-bright: #84f3db;
  --line: rgba(132, 243, 219, 0.2);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--background);
}

body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

.site-shell {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  background:
    radial-gradient(circle at 71% 35%, rgba(33, 186, 155, 0.1), transparent 24rem),
    linear-gradient(135deg, #05090b 0%, #081013 54%, #060a0c 100%);
}

.site-shell::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.28;
  background-image: linear-gradient(rgba(77, 222, 190, 0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(77, 222, 190, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, black, transparent 85%);
}

.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1380px, calc(100% - 96px));
  height: 112px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 10px;
  height: 10px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 14px rgba(71, 221, 189, 0.8);
}

.site-nav {
  display: flex;
  gap: 48px;
  align-items: center;
}

.site-nav a {
  position: relative;
  padding: 12px 0;
  color: #c4cecc;
  font-size: 17px;
  transition: color 180ms ease;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 3px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a.active {
  color: var(--foreground);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.site-nav a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.hero {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(540px, 1.15fr);
  align-items: center;
  width: min(1380px, calc(100% - 96px));
  min-height: calc(100vh - 112px);
  margin: 0 auto;
  padding: 40px 0 110px;
}

.hero-copy {
  position: relative;
  z-index: 4;
  padding-left: 4px;
  animation: copy-in 700ms ease both;
}

.eyebrow {
  display: flex;
  gap: 12px;
  align-items: center;
  margin: 0 0 28px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
}

.eyebrow span {
  width: 34px;
  height: 1px;
  background: currentColor;
}

.hero h1 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(54px, 6vw, 86px);
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.hero h2 {
  margin: 30px 0 0;
  color: var(--accent);
  font-size: clamp(24px, 2.3vw, 35px);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.intro {
  max-width: 600px;
  margin: 28px 0 0;
  color: #abb7b5;
  font-size: 18px;
  line-height: 1.9;
}

.primary-button {
  display: inline-flex;
  gap: 46px;
  align-items: center;
  justify-content: space-between;
  min-width: 210px;
  margin-top: 42px;
  padding: 19px 24px;
  border: 1px solid rgba(132, 243, 219, 0.42);
  border-radius: 8px;
  background: linear-gradient(135deg, #64e4c8, #43cdb0);
  box-shadow: 0 12px 42px rgba(43, 202, 169, 0.2);
  color: #071310;
  font-size: 17px;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, filter 180ms ease;
}

.primary-button:hover,
.primary-button:focus-visible {
  outline: none;
  box-shadow: 0 16px 52px rgba(69, 224, 190, 0.32);
  filter: brightness(1.08);
  transform: translateY(-3px);
}

.hero-visual {
  position: absolute;
  z-index: 1;
  top: 3%;
  right: -12%;
  bottom: -4%;
  width: 76%;
  pointer-events: none;
}

.hero-visual::after {
  position: absolute;
  inset: 0;
  content: "";
  background: radial-gradient(circle at 60% 48%, transparent 0 18%, rgba(5, 10, 12, 0.08) 42%, #070b0d 78%);
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.9;
  mix-blend-mode: screen;
  animation: visual-in 1.2s ease both, drift 9s ease-in-out 1.2s infinite alternate;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 82%);
}

.orbit {
  position: absolute;
  z-index: 2;
  border: 1px solid rgba(71, 221, 189, 0.2);
  border-radius: 50%;
}

.orbit-one {
  top: 10%;
  right: 7%;
  width: 54%;
  aspect-ratio: 1;
}

.orbit-two {
  right: 1%;
  bottom: 8%;
  width: 73%;
  aspect-ratio: 2 / 1;
  transform: rotate(-12deg);
}

.signal {
  position: absolute;
  z-index: 4;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-bright);
  box-shadow: 0 0 7px 2px rgba(132, 243, 219, 0.75), 0 0 24px 7px rgba(71, 221, 189, 0.25);
  animation: pulse 2.4s ease-in-out infinite;
}

.signal-one { top: 20%; right: 15%; }
.signal-two { top: 60%; right: 47%; animation-delay: 700ms; }
.signal-three { right: 8%; bottom: 24%; animation-delay: 1.2s; }

.ambient {
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

.ambient-one {
  top: 32%;
  right: 20%;
  width: 320px;
  height: 320px;
  background: rgba(26, 187, 153, 0.09);
}

.ambient-two {
  bottom: 12%;
  left: 2%;
  width: 220px;
  height: 220px;
  background: rgba(22, 101, 83, 0.08);
}

.about-section {
  position: relative;
  z-index: 5;
  display: grid;
  grid-template-columns: 0.6fr 1.1fr 1fr auto;
  gap: 40px;
  align-items: start;
  width: min(1380px, calc(100% - 96px));
  margin: 0 auto;
  padding: 110px 0;
  border-top: 1px solid var(--line);
}

.about-section .section-label {
  margin: 8px 0 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.about-section h2 {
  margin: 0;
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.2;
}

.about-section > p:not(.section-label) {
  margin: 4px 0 0;
  color: var(--muted);
  line-height: 1.9;
}

.about-section > a {
  margin-top: 6px;
  color: var(--accent);
  white-space: nowrap;
}

@keyframes copy-in {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes visual-in {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 0.9; transform: scale(1); }
}

@keyframes drift {
  from { transform: translate3d(-5px, 5px, 0) scale(1); }
  to { transform: translate3d(10px, -8px, 0) scale(1.018); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; transform: scale(0.72); }
  50% { opacity: 1; transform: scale(1); }
}

@media (max-width: 900px) {
  .site-header,
  .hero,
  .about-section {
    width: min(100% - 40px, 720px);
  }

  .site-header { height: 88px; }
  .brand { font-size: 18px; }
  .site-nav { gap: 24px; }

  .hero {
    display: flex;
    min-height: calc(100vh - 88px);
    padding: 70px 0 100px;
  }

  .hero-copy { width: 100%; }
  .hero h1 { font-size: clamp(48px, 12vw, 72px); }
  .hero h2 { font-size: clamp(23px, 6vw, 31px); }
  .intro { max-width: 520px; font-size: 16px; }

  .hero-visual {
    top: 14%;
    right: -48%;
    bottom: 0;
    width: 120%;
    opacity: 0.52;
  }

  .hero-visual::after {
    background: linear-gradient(90deg, #070b0d 2%, rgba(7, 11, 13, 0.74) 35%, rgba(7, 11, 13, 0.15) 82%);
  }

  .about-section {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 80px 0;
  }
}

@media (max-width: 520px) {
  .site-header { height: 76px; }
  .site-nav a { font-size: 15px; }
  .site-nav { gap: 18px; }
  .brand-mark { display: none; }

  .hero {
    min-height: calc(100svh - 76px);
    padding: 48px 0 76px;
  }

  .eyebrow { margin-bottom: 22px; }
  .hero h1 { max-width: 360px; font-size: 48px; }
  .hero h2 { margin-top: 24px; }
  .intro { margin-top: 22px; }
  .primary-button { width: 100%; margin-top: 34px; }
  .hero-visual { right: -75%; width: 160%; opacity: 0.38; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}