:root {
  color-scheme: dark;
  --bg: #0b0f14;
  --panel: #111820;
  --panel-2: #0e151d;
  --text: #f2f0e9;
  --muted: #9aa6b2;
  --line: #24303c;
  --accent: #e8b45a;
  --accent-2: #6ee7d8;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(900px 520px at 78% -10%, rgba(232, 180, 90, 0.13), transparent 65%),
    radial-gradient(800px 500px at 12% 18%, rgba(110, 231, 216, 0.07), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: #1b1306;
  z-index: 10;
}
.skip:focus { left: 1rem; top: 1rem; }

.header {
  width: min(var(--max), calc(100% - 3rem));
  margin: 0 auto;
  padding: 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 1.05rem;
}
.brand small {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header nav {
  display: flex;
  gap: 1.6rem;
  font-size: 0.92rem;
}
.header nav a {
  color: var(--muted);
  text-decoration: none;
}
.header nav a:hover { color: var(--text); }

main {
  width: min(var(--max), calc(100% - 3rem));
  margin: 0 auto;
}

.hero {
  min-height: 68vh;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  align-items: center;
  gap: 4rem;
  padding: 5rem 0 4rem;
}

.eyebrow {
  margin: 0 0 1.2rem;
  color: var(--accent-2);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.12; margin: 0; }

h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
  letter-spacing: -0.045em;
  font-weight: 750;
}

h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.6rem);
  letter-spacing: -0.025em;
  margin-bottom: 1.4rem;
}

h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.lead {
  color: var(--muted);
  max-width: 36rem;
  font-size: 1.05rem;
  margin: 1.5rem 0 0;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2.2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0 1.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.94rem;
  background: rgba(17, 24, 32, 0.7);
}
.button:hover { border-color: #3b4c5e; }
.button--primary {
  background: var(--accent);
  color: #1b1306;
  border-color: var(--accent);
}
.button--primary:hover { background: #f0c477; border-color: #f0c477; }

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.86rem;
}
.status span {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 4px rgba(110, 231, 216, 0.12);
}

.signal {
  position: relative;
  aspect-ratio: 1;
  max-width: 430px;
  justify-self: end;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(232, 180, 90, 0.18), transparent 42%),
    repeating-radial-gradient(circle, transparent 0 26px, rgba(154, 166, 178, 0.16) 27px 28px);
  display: grid;
  place-items: center;
}
.signal__rings {
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  border: 1px dashed rgba(232, 180, 90, 0.4);
}
.signal__core {
  width: 24%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff4dc, var(--accent) 55%, #a87525);
  box-shadow: 0 0 70px rgba(232, 180, 90, 0.35);
}
.signal__label {
  position: absolute;
  bottom: 12%;
  color: var(--muted);
  font-size: 0.66rem;
  letter-spacing: 0.22em;
}

.section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  background: linear-gradient(180deg, rgba(17, 24, 32, 0.85), rgba(14, 21, 29, 0.55));
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}
code {
  color: var(--accent);
  font-family: "SFMono-Regular", "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.88em;
  overflow-wrap: anywhere;
}

.section--start .lead { margin-top: 0; }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}
.links a {
  display: inline-flex;
  gap: 0.6rem;
  align-items: center;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.94rem;
  background: rgba(17, 24, 32, 0.65);
}
.links a:hover { border-color: #3b4c5e; }
.links span { color: var(--muted); }

.footer {
  width: min(var(--max), calc(100% - 3rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--line);
}

.notfound {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 1.2rem;
}
.notfound h1 { font-size: clamp(2rem, 5vw, 3.6rem); }
.notfound .lead { margin: 0; }
.notfound .button { margin-top: 0.5rem; }

@media (max-width: 820px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 3rem;
    padding-top: 3.5rem;
  }
  .signal { justify-self: start; max-width: 300px; }
  .grid { grid-template-columns: 1fr; }
  .header nav { gap: 1rem; }
}

@media (max-width: 520px) {
  .header { align-items: flex-start; flex-direction: column; gap: 0.9rem; }
  .header nav { flex-wrap: wrap; }
  .footer { flex-direction: column; }
}

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