:root {
  color-scheme: dark;
  --bg: #06080b;
  --panel: rgba(11, 16, 21, 0.68);
  --line: rgba(212, 229, 235, 0.15);
  --line-strong: rgba(212, 229, 235, 0.28);
  --text: #eef4f5;
  --muted: #8f9ca3;
  --cyan: #5ce1e6;
  --cyan-bright: #a7fbff;
  --amber: #f0a43c;
  --mx: 50%;
  --my: 50%;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Avenir Next", "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

html[lang^="zh"] body {
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
}

html[lang^="zh"] h1 {
  letter-spacing: -0.025em;
  line-height: 1.04;
}

button,
a {
  font: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--cyan-bright);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 1rem;
  left: 1rem;
  padding: 0.65rem 0.85rem;
  transform: translateY(-200%);
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.ambient {
  position: fixed;
  z-index: -1;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.ambient::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--mx) var(--my), rgba(92, 225, 230, 0.07), transparent 26rem);
}

.ambient__grid {
  position: absolute;
  inset: -20%;
  opacity: 0.34;
  background-image:
    linear-gradient(rgba(111, 143, 151, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(111, 143, 151, 0.08) 1px, transparent 1px);
  background-size: 4.5rem 4.5rem;
  mask-image: linear-gradient(to bottom, black, transparent 88%);
  transform: perspective(700px) rotateX(54deg) translateY(11%);
  transform-origin: 50% 100%;
}

.ambient__noise {
  position: absolute;
  inset: 0;
  opacity: 0.12;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.32'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

.ambient__glow {
  position: absolute;
  width: 38rem;
  height: 38rem;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.09;
}

.ambient__glow--cyan {
  top: -18rem;
  right: -10rem;
  background: var(--cyan);
}

.ambient__glow--amber {
  bottom: -26rem;
  left: -12rem;
  background: var(--amber);
}

.shell {
  width: min(100% - 3rem, 90rem);
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.topbar {
  min-height: 7rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text);
  text-decoration: none;
}

.brand__mark {
  position: relative;
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--cyan-bright);
  font-size: 0.8rem;
  font-weight: 700;
}

.brand__mark::before {
  content: "";
  position: absolute;
  inset: 0.25rem;
  border: 1px solid rgba(92, 225, 230, 0.28);
  border-radius: inherit;
}

.brand__mark i {
  position: absolute;
  width: 0.3rem;
  height: 0.3rem;
  top: 0;
  right: 0.2rem;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0.8rem var(--amber);
}

.brand__wordmark {
  letter-spacing: 0.16em;
  font-size: 0.76rem;
  font-weight: 700;
}

.brand__wordmark span {
  padding: 0 0.12rem;
  color: var(--cyan);
}

.topbar__right {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
}

.status {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
}

.status__pulse {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0.8rem var(--cyan);
  animation: pulse 2.4s ease-out infinite;
}

.languages {
  display: flex;
  gap: 0.16rem;
}

.language {
  min-width: 2.3rem;
  padding: 0.5rem 0.35rem;
  border: 0;
  border-bottom: 1px solid transparent;
  background: transparent;
  color: #69767d;
  cursor: pointer;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  transition: color 180ms ease, border-color 180ms ease;
}

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

.language.is-active {
  border-color: var(--cyan);
  color: var(--cyan-bright);
}

main {
  flex: 1;
}

.hero {
  min-height: min(68vh, 48rem);
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(23rem, 0.88fr);
  align-items: center;
  gap: clamp(3rem, 7vw, 8rem);
  padding: clamp(4rem, 9vh, 7.5rem) 0 clamp(3.5rem, 8vh, 6rem);
}

.hero__copy {
  position: relative;
  z-index: 2;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.95rem;
  margin: 0 0 1.8rem;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.15em;
}

.eyebrow span:first-child {
  display: inline-flex;
  align-items: center;
  color: var(--cyan);
}

.eyebrow span:first-child::after {
  content: "";
  width: 2rem;
  height: 1px;
  margin-left: 0.8rem;
  background: rgba(92, 225, 230, 0.5);
}

h1 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(3.35rem, 6.5vw, 7.2rem);
  font-weight: 300;
  letter-spacing: -0.066em;
  line-height: 0.92;
  text-wrap: balance;
}

h1 em {
  color: transparent;
  font-style: normal;
  font-weight: 500;
  -webkit-text-stroke: 1px rgba(238, 244, 245, 0.78);
}

.intro {
  max-width: 40rem;
  margin: 2.1rem 0 0;
  color: #aab5ba;
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  line-height: 1.7;
}

.contact-line {
  max-width: 36rem;
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.2rem;
  align-items: start;
  margin-top: 2.2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}

.contact-line__index {
  color: var(--amber);
  font-size: 1.1rem;
}

.contact-line p {
  margin: 0;
  color: #d1dadd;
  font-size: 0.9rem;
}

.signal {
  display: grid;
  place-items: center;
  min-width: 0;
}

.signal__frame {
  --rx: 0deg;
  --ry: 0deg;
  position: relative;
  width: min(100%, 31rem);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  transform: perspective(900px) rotateX(var(--rx)) rotateY(var(--ry));
  transition: transform 220ms ease-out;
}

.signal__frame::before,
.signal__frame::after {
  content: "";
  position: absolute;
  inset: 5%;
  border: 1px solid rgba(220, 236, 240, 0.06);
  border-radius: 50%;
}

.signal__frame::after {
  inset: 14%;
  border-style: dashed;
  animation: orbit 28s linear infinite;
}

.signal__ticks {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  opacity: 0.42;
  background: repeating-conic-gradient(
    from 0deg,
    rgba(174, 211, 218, 0.68) 0deg 0.35deg,
    transparent 0.35deg 8deg
  );
  mask: radial-gradient(circle, transparent 66%, black 66.5% 68%, transparent 68.5%);
  animation: orbit 80s linear infinite reverse;
}

.signal__ring {
  position: absolute;
  border-radius: 50%;
}

.signal__ring--outer {
  inset: 10%;
  border: 1px solid rgba(92, 225, 230, 0.18);
  border-right-color: rgba(92, 225, 230, 0.72);
  border-bottom-color: transparent;
  animation: orbit 18s linear infinite;
}

.signal__ring--middle {
  inset: 22%;
  border: 1px solid rgba(238, 244, 245, 0.12);
  border-top-color: rgba(240, 164, 60, 0.82);
  border-left-color: transparent;
  animation: orbit 13s linear infinite reverse;
}

.signal__ring--inner {
  inset: 34%;
  border: 1px solid rgba(92, 225, 230, 0.32);
  box-shadow:
    inset 0 0 2rem rgba(92, 225, 230, 0.08),
    0 0 4rem rgba(92, 225, 230, 0.05);
}

.signal__sweep {
  position: absolute;
  inset: 23%;
  overflow: hidden;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0 310deg, rgba(92, 225, 230, 0.18) 342deg, rgba(92, 225, 230, 0.55) 359deg, transparent 360deg);
  mask: radial-gradient(circle, transparent 12%, black 78%);
  animation: orbit 5.5s linear infinite;
}

.signal__core {
  position: relative;
  z-index: 2;
  width: 31%;
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(92, 225, 230, 0.27);
  border-radius: 50%;
  background: rgba(7, 12, 16, 0.78);
  box-shadow: 0 0 3rem rgba(92, 225, 230, 0.08);
  backdrop-filter: blur(8px);
}

.signal__core strong {
  margin: -0.1rem 0;
  color: var(--text);
  font-size: clamp(2.1rem, 4.7vw, 3.8rem);
  font-weight: 300;
  letter-spacing: -0.08em;
}

.signal__micro,
.signal__label {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.58rem;
  letter-spacing: 0.17em;
}

.signal__node {
  position: absolute;
  z-index: 3;
  width: 0.44rem;
  height: 0.44rem;
  border: 1px solid var(--cyan-bright);
  border-radius: 50%;
  background: var(--bg);
  box-shadow: 0 0 1rem var(--cyan);
}

.signal__node--one {
  top: 13%;
  left: 50%;
}

.signal__node--two {
  top: 63%;
  right: 12%;
  border-color: var(--amber);
  box-shadow: 0 0 1rem var(--amber);
}

.signal__node--three {
  bottom: 16%;
  left: 23%;
}

.signal__label {
  position: absolute;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--line);
  background: rgba(6, 8, 11, 0.75);
}

.signal__label--one {
  top: 6%;
  left: 51%;
}

.signal__label--two {
  top: 63%;
  right: 1%;
}

.signal__label--three {
  bottom: 8%;
  left: 8%;
}

.coordinates {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.coordinate {
  min-height: 7.5rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(1rem, 2vw, 1.8rem);
  align-items: center;
  padding: 1.5rem clamp(1rem, 2.5vw, 2rem);
  border-right: 1px solid var(--line);
}

.coordinate:first-child {
  padding-left: 0;
}

.coordinate:last-child {
  padding-right: 0;
  border-right: 0;
}

.coordinate__number {
  align-self: start;
  padding-top: 0.15rem;
  color: #526168;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
}

.coordinate h2 {
  margin: 0 0 0.38rem;
  color: #cbd5d8;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
}

.coordinate p {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.coordinate--time time {
  color: var(--cyan-bright);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.coordinate--time p span {
  margin-left: 0.35rem;
  color: #536169;
  font-size: 0.68rem;
}

.footer {
  min-height: 5.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #526168;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.65rem;
  letter-spacing: 0.11em;
}

@keyframes orbit {
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.58; box-shadow: 0 0 0.4rem var(--cyan); }
  50% { opacity: 1; box-shadow: 0 0 1.2rem var(--cyan); }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 3rem;
    padding-bottom: 4rem;
  }

  .hero__copy {
    max-width: 45rem;
  }

  .signal {
    width: min(100%, 29rem);
    margin: 0 auto;
  }

  .coordinates {
    grid-template-columns: 1fr 1fr;
  }

  .coordinate:nth-child(2) {
    border-right: 0;
  }

  .coordinate:last-child {
    grid-column: 1 / -1;
    padding-left: 0;
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 620px) {
  .shell {
    width: min(100% - 2rem, 90rem);
  }

  .topbar {
    min-height: 6rem;
  }

  .brand__wordmark {
    max-width: 5.8rem;
    line-height: 1.45;
  }

  .brand {
    gap: 0.55rem;
  }

  .language {
    min-width: 2.05rem;
    padding-inline: 0.25rem;
  }

  .status {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 4.5rem 0 3.5rem;
  }

  h1 {
    font-size: clamp(3.05rem, 15vw, 5rem);
  }

  .intro {
    margin-top: 1.7rem;
  }

  .signal__frame {
    width: min(90vw, 25rem);
  }

  .coordinates {
    grid-template-columns: 1fr;
  }

  .coordinate,
  .coordinate:first-child,
  .coordinate:last-child {
    min-height: 6.3rem;
    grid-column: auto;
    padding: 1.25rem 0;
    border-right: 0;
  }

  .coordinate + .coordinate {
    border-top: 1px solid var(--line);
  }

  .footer {
    min-height: 6.5rem;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 0.45rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}