:root {
  color-scheme: dark;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #edf2e8;
  background: #0a1017;
  font-synthesis: none;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background:
    radial-gradient(circle at 76% 18%, rgba(189, 143, 61, 0.2), transparent 28rem),
    radial-gradient(circle at 12% 72%, rgba(53, 116, 105, 0.2), transparent 32rem),
    linear-gradient(145deg, #111b25 0%, #080d13 62%, #0b131a 100%);
}

body::before {
  position: fixed;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.14;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

a { color: inherit; }

.page-shell {
  position: relative;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 92px;
  border-bottom: 1px solid rgba(224, 199, 145, 0.18);
}

.brand {
  display: inline-flex;
  gap: 13px;
  align-items: center;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 43px;
  height: 43px;
  place-items: center;
  border: 1px solid #c99a48;
  border-radius: 50%;
  color: #e6bd72;
  font-family: Georgia, serif;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.brand strong, .brand small { display: block; }
.brand strong { font-family: "STSong", "Songti SC", serif; font-size: 18px; letter-spacing: 0.12em; }
.brand small { margin-top: 3px; color: #94a29e; font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; }

.official-badge {
  padding: 7px 11px;
  border: 1px solid rgba(210, 171, 95, 0.32);
  border-radius: 999px;
  color: #c9bb9d;
  font-size: 12px;
  letter-spacing: 0.06em;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 72px;
  align-items: center;
  min-height: 650px;
  padding: 74px 0 80px;
}

.eyebrow {
  margin: 0 0 16px;
  color: #d7a852;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.24em;
}

h1, h2 { margin: 0; font-family: "STSong", "Songti SC", Georgia, serif; font-weight: 600; }
h1 { max-width: 650px; font-size: clamp(44px, 6.4vw, 78px); line-height: 1.12; letter-spacing: -0.04em; }
h2 { font-size: clamp(28px, 4vw, 42px); }

.intro {
  max-width: 610px;
  margin: 28px 0 36px;
  color: #aebbb7;
  font-size: 17px;
  line-height: 1.9;
}

.download-card { max-width: 520px; }

.download-button {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 24px;
  border: 1px solid #e0ad55;
  border-radius: 12px;
  background: linear-gradient(135deg, #d6a34d, #b77c2d);
  box-shadow: 0 16px 42px rgba(191, 129, 42, 0.2);
  color: #161007;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.download-button:hover { transform: translateY(-2px); box-shadow: 0 20px 48px rgba(191, 129, 42, 0.28); }
.download-button:focus-visible { outline: 3px solid #fff; outline-offset: 4px; }
.download-button span { font-size: 18px; font-weight: 800; }
.download-button small { font-size: 12px; opacity: 0.74; }

.release-detail { margin: 12px 4px 0; color: #7f908c; font-size: 12px; line-height: 1.6; }

.chronicle {
  position: relative;
  display: grid;
  aspect-ratio: 1;
  place-items: center;
  isolation: isolate;
}

.chronicle::before {
  position: absolute;
  width: 72%;
  height: 72%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(207, 157, 72, 0.22), transparent 68%);
  content: "";
  filter: blur(8px);
}

.chronicle-ring {
  position: absolute;
  border: 1px solid rgba(218, 176, 98, 0.48);
  border-radius: 50%;
}

.ring-one { inset: 7%; border-style: dashed; transform: rotate(12deg); }
.ring-two { inset: 18%; border-color: rgba(109, 156, 142, 0.48); }

.chronicle-core {
  display: flex;
  z-index: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 50%;
  aspect-ratio: 1;
  border: 1px solid rgba(226, 190, 119, 0.72);
  border-radius: 50%;
  background: rgba(9, 15, 21, 0.72);
  box-shadow: inset 0 0 32px rgba(214, 164, 75, 0.13);
  font-family: Georgia, serif;
  letter-spacing: 0.16em;
  text-align: center;
}

.chronicle-core span { color: #d6c6a7; font-size: clamp(10px, 1.5vw, 15px); }
.chronicle-core strong { margin: 9px 0; color: #d5a24e; font-size: clamp(26px, 4vw, 44px); }
.chronicle > p { position: absolute; bottom: 11%; color: #75847f; font-size: 9px; letter-spacing: 0.3em; }

.guide {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 64px;
  padding: 70px 0;
  border-top: 1px solid rgba(224, 199, 145, 0.18);
}

.guide ol {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide li { min-width: 0; }
.guide li > span { display: block; margin-bottom: 20px; color: #a77634; font: 12px/1 Georgia, serif; }
.guide li strong { font-size: 16px; }
.guide li p { margin: 10px 0 0; color: #84938e; font-size: 13px; line-height: 1.7; }

.safety {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  margin-bottom: 56px;
  padding: 20px 22px;
  border: 1px solid rgba(94, 137, 125, 0.32);
  border-radius: 10px;
  background: rgba(35, 74, 67, 0.12);
}

.safety strong { flex: 0 0 auto; color: #9cc3b6; }
.safety p { margin: 0; color: #879a94; font-size: 13px; line-height: 1.7; }
.safety code { color: #bdd0ca; }

footer {
  display: flex;
  justify-content: space-between;
  padding: 30px 0 42px;
  border-top: 1px solid rgba(224, 199, 145, 0.12);
  color: #65736f;
  font-size: 12px;
}

footer a { text-underline-offset: 4px; }

@media (max-width: 820px) {
  .page-shell { width: min(100% - 28px, 680px); }
  .site-header { min-height: 78px; }
  .official-badge { display: none; }
  .hero { grid-template-columns: 1fr; gap: 20px; min-height: auto; padding: 58px 0 72px; }
  .hero-copy { z-index: 1; }
  .chronicle { position: absolute; top: 108px; right: -42%; width: 85%; opacity: 0.27; }
  .guide { grid-template-columns: 1fr; gap: 42px; padding: 56px 0; }
  .guide ol { grid-template-columns: 1fr; gap: 28px; }
  .guide li { display: grid; grid-template-columns: 38px 1fr; }
  .guide li > span { grid-row: 1 / 3; margin: 3px 0 0; }
  .guide li p { grid-column: 2; }
  .safety { flex-direction: column; gap: 9px; }
}

@media (prefers-reduced-motion: reduce) {
  .download-button { transition: none; }
}