@import url("https://fonts.googleapis.com/css2?family=DM+Mono:wght@300;400&family=Noto+Serif+SC:wght@400;600&display=swap");

:root {
  color-scheme: dark;
  --bg: #07111f;
  --panel: #0b1727;
  --ink: #f2eddf;
  --muted: #8997aa;
  --blue: #6e9cff;
  --amber: #d9a45f;
  --line: rgba(199, 214, 236, 0.17);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 78% 42%, rgba(50, 96, 181, 0.13), transparent 30%),
    var(--bg);
  color: var(--ink);
  font-family: "DM Mono", "Microsoft YaHei", monospace;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  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='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.13'/%3E%3C/svg%3E");
  content: "";
  opacity: 0.22;
  pointer-events: none;
}

a { color: inherit; }

.page-shell {
  width: min(1480px, 100%);
  min-height: 100svh;
  margin: 0 auto;
  padding: 0 clamp(22px, 5vw, 84px);
}

.site-header,
.site-footer {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 13px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.08em;
}

.wordmark-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--blue);
  color: var(--blue);
  font-family: Georgia, serif;
  font-size: 18px;
}

.status { display: flex; align-items: center; gap: 9px; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 14px var(--amber); }

.hero {
  min-height: calc(100svh - 168px);
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(430px, 1.08fr);
  align-items: center;
  gap: clamp(48px, 7vw, 110px);
  padding: clamp(68px, 9vw, 138px) 0;
}

.eyebrow {
  display: flex;
  gap: 22px;
  margin: 0 0 35px;
  color: var(--amber);
  font-size: 9px;
  letter-spacing: 0.16em;
}

.eyebrow span:last-child { color: var(--muted); }

h1 {
  margin: 0;
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(58px, 7vw, 105px);
  font-weight: 400;
  line-height: 1.03;
  letter-spacing: -0.06em;
}

h1 em { color: var(--blue); font-style: normal; }

.lede {
  max-width: 590px;
  margin: 38px 0 0;
  padding-left: 20px;
  border-left: 1px solid var(--amber);
  color: #aab5c3;
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 15px;
  line-height: 2;
}

.coming-soon {
  display: grid;
  grid-template-columns: auto minmax(28px, 90px) auto;
  align-items: center;
  gap: 14px;
  width: fit-content;
  margin-top: 38px;
  color: var(--muted);
  font-size: 9px;
  letter-spacing: 0.14em;
}

.coming-soon .rule { height: 1px; background: var(--blue); }

.theory-figure {
  position: relative;
  aspect-ratio: 1 / 1.05;
  min-height: 470px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(10, 23, 39, 0.6);
}

.coordinate-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at 50% 48%, black, transparent 77%);
}

.light-cone {
  position: absolute;
  left: 50%;
  top: 46%;
  width: 76%;
  height: 76%;
  border: 1px solid rgba(110, 156, 255, 0.65);
  transform: translate(-50%, -50%) rotate(45deg);
  box-shadow: inset 0 0 58px rgba(110, 156, 255, 0.04);
}

.light-cone::before,
.light-cone::after {
  position: absolute;
  inset: 12%;
  border: 1px solid rgba(217, 164, 95, 0.35);
  content: "";
}

.light-cone::after { inset: 27%; border-color: rgba(110, 156, 255, 0.38); }

.orbit {
  position: absolute;
  left: 50%;
  top: 46%;
  border: 1px dashed var(--blue);
  border-radius: 50%;
  transform: translate(-50%, -50%) rotate(-12deg);
  animation: turn 24s linear infinite;
}

.orbit-a { width: 88%; height: 31%; }
.orbit-b { width: 43%; height: 86%; border-color: rgba(217, 164, 95, 0.72); animation-direction: reverse; }

.particle {
  position: absolute;
  left: calc(50% - 6px);
  top: calc(46% - 6px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 10px var(--ink), 0 0 42px var(--blue);
}

.equation {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  font-family: Georgia, serif;
}

.equation span { font-size: clamp(54px, 7vw, 104px); font-style: italic; }
.equation i { margin-top: 95px; color: var(--muted); font-size: 15px; font-weight: 400; }

.figure-label {
  position: absolute;
  right: 18px;
  bottom: 16px;
  left: 18px;
  display: flex;
  justify-content: space-between;
  margin: 0;
  color: var(--muted);
  font-size: 8px;
  letter-spacing: 0.1em;
}

.figure-label span { color: var(--amber); }

.topics {
  display: grid;
  grid-template-columns: 0.7fr 2.3fr;
  gap: 30px;
  padding: 52px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.topics > p { margin: 5px 0 0; color: var(--muted); font-size: 9px; letter-spacing: 0.12em; }
.topics ul { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 0; padding: 0; list-style: none; background: var(--line); }
.topics li { min-height: 94px; display: flex; align-items: end; justify-content: space-between; padding: 18px; background: var(--bg); font-family: "Noto Serif SC", serif; font-size: 18px; }
.topics li span { align-self: start; color: var(--blue); font-family: "DM Mono", monospace; font-size: 8px; }

.site-footer { min-height: 94px; border-bottom: 0; }

@keyframes turn {
  to { transform: translate(-50%, -50%) rotate(348deg); }
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .theory-figure { min-height: 0; }
  .topics { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .site-header { min-height: 72px; }
  .status { font-size: 0; }
  .hero { min-height: auto; padding: 68px 0 76px; }
  h1 { font-size: clamp(54px, 17vw, 74px); }
  .lede { font-size: 14px; }
  .theory-figure { aspect-ratio: 0.92; }
  .topics ul { grid-template-columns: 1fr; }
  .topics li { min-height: 72px; }
  .site-footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orbit { animation: none; }
}