/* DP Daoji — split landing: mountain (lower) / cloud (upper) */
:root {
  --dao-bg: #070a0e;
  --dao-bg-2: #0c1219;
  --dao-ink: #e9e2d2;
  --dao-muted: #9b9485;
  --gold: #c9a86a;
  --upper-bg-1: #fbfdff;
  --upper-bg-2: #eaf4fd;
  --upper-bg-3: #d9e9f8;
  --upper-ink: #24323f;
  --upper-muted: #6b8094;
  --upper-gold: #b8893f;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: "Noto Serif CJK JP", "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN",
    "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  background: var(--dao-bg);
  color: var(--dao-ink);
  overflow-x: hidden;
}

.split {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
}

.side {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 22px;
  padding: 9vh 8vw;
  text-decoration: none;
  overflow: hidden;
  transition: background .35s ease, transform .35s ease;
  -webkit-tap-highlight-color: transparent;
}

/* left: mountain */
.side-dao {
  color: var(--dao-ink);
  background:
    radial-gradient(ellipse 60% 40% at 18% 18%, rgba(201, 168, 106, 0.10), transparent 68%),
    radial-gradient(ellipse 55% 45% at 80% 82%, rgba(70, 95, 120, 0.18), transparent 70%),
    linear-gradient(155deg, var(--dao-bg) 0%, var(--dao-bg-2) 58%, #0a1017 100%);
}
.side-dao::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 12% 22%, rgba(255, 255, 255, .5), transparent 100%),
    radial-gradient(1px 1px at 72% 16%, rgba(255, 255, 255, .35), transparent 100%),
    radial-gradient(1px 1px at 38% 62%, rgba(255, 255, 255, .3), transparent 100%),
    radial-gradient(1px 1px at 86% 48%, rgba(255, 255, 255, .25), transparent 100%);
  pointer-events: none;
}
.side-dao .mountains {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  width: 100%; height: 42%;
  opacity: .85;
  pointer-events: none;
}
.side-dao:hover {
  background:
    radial-gradient(ellipse 60% 40% at 18% 18%, rgba(201, 168, 106, 0.16), transparent 68%),
    radial-gradient(ellipse 55% 45% at 80% 82%, rgba(80, 110, 140, 0.24), transparent 70%),
    linear-gradient(155deg, #0a0f15 0%, #101821 58%, #0c141c 100%);
}

/* right: cloud */
.side-upper {
  color: var(--upper-ink);
  background:
    radial-gradient(ellipse 48% 22% at 16% 16%, rgba(255, 255, 255, .96), transparent 70%),
    radial-gradient(ellipse 40% 18% at 82% 22%, rgba(255, 255, 255, .9), transparent 72%),
    radial-gradient(ellipse 55% 20% at 46% 86%, rgba(255, 255, 255, .8), transparent 72%),
    linear-gradient(180deg, var(--upper-bg-1), var(--upper-bg-2) 48%, var(--upper-bg-3));
}
.side-upper::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 34% 12% at 70% 36%, rgba(255, 255, 255, .7), transparent 72%),
    radial-gradient(ellipse 26% 10% at 24% 58%, rgba(255, 255, 255, .55), transparent 74%);
  pointer-events: none;
}
.side-upper .sun {
  position: absolute;
  right: 12%;
  top: 18%;
  width: 104px;
  height: 104px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fffdf6, #f6e8c8 62%, #e3c98f);
  box-shadow: 0 0 0 14px rgba(255, 255, 255, .45), 0 24px 60px rgba(184, 137, 63, .22);
  display: grid;
  place-items: center;
  color: var(--upper-gold);
  font-size: 34px;
  pointer-events: none;
}
.side-upper .sun-mark {
  width: 26px;
  height: 26px;
  border: 1px solid var(--upper-gold);
  border-radius: 50%;
  position: relative;
}
.side-upper .sun-mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  background: var(--upper-gold);
}
.side-upper:hover { filter: brightness(1.015); }

/* shared typography */
.kicker {
  font-size: 12px;
  letter-spacing: .32em;
  opacity: .8;
}
.sym {
  font-size: 26px;
  letter-spacing: .2em;
}
.side-dao .kicker, .side-dao .sym { color: var(--gold); }
.side-upper .kicker, .side-upper .sym { color: var(--upper-gold); }

.title {
  margin: 0;
  font-size: clamp(44px, 6vw, 86px);
  line-height: 1.05;
  letter-spacing: .08em;
  font-weight: 600;
}
.sub {
  margin: 0;
  font-size: clamp(14px, 1.2vw, 17px);
  letter-spacing: .06em;
  opacity: .86;
}
.meta {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 13px;
  letter-spacing: .04em;
  opacity: .7;
}
.sources {
  max-width: 40ch;
  margin-top: -8px;
  font-size: 12px;
  line-height: 1.85;
  letter-spacing: .02em;
}
.side-dao .sub, .side-dao .meta, .side-dao .sources { color: var(--dao-muted); }
.side-upper .sub, .side-upper .meta, .side-upper .sources { color: var(--upper-muted); }
.side-dao .sources b { color: var(--dao-ink); font-weight: 600; }
.side-upper .sources b { color: var(--upper-ink); font-weight: 600; }

.cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
  font-size: 15px;
  letter-spacing: .12em;
}
.cta .arrow {
  display: inline-grid;
  place-items: center;
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid currentColor;
  transition: transform .25s ease, background .25s ease;
}
.side:hover .cta .arrow { transform: translateX(6px); }
.side-dao .cta { color: var(--gold); }
.side-upper .cta { color: var(--upper-gold); }

.side:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: -10px;
}

/* the seam */
.seam {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 220px;
  transform: translateX(-50%);
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(90deg,
    rgba(7, 10, 14, 0) 0%,
    rgba(7, 10, 14, .45) 26%,
    rgba(7, 10, 14, .92) 45%,
    rgba(255, 255, 255, .92) 55%,
    rgba(255, 255, 255, .45) 74%,
    rgba(255, 255, 255, 0) 100%);
  filter: blur(16px);
}
.seam::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 6%;
  bottom: 6%;
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, var(--gold) 18%, #f2dfb7 50%, var(--gold) 82%, transparent);
  box-shadow: 0 0 18px rgba(201, 168, 106, .55);
}

/* top mark */
.topmark {
  position: absolute;
  top: 22px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(10, 14, 19, .55);
  border: 1px solid rgba(201, 168, 106, .35);
  color: #efe7d6;
  font-size: 11px;
  letter-spacing: .28em;
  backdrop-filter: blur(8px);
  pointer-events: none;
}
.topmark .dot { color: var(--gold); }

/* language switch */
.lang-switch {
  position: absolute;
  top: 26px;
  right: 32px;
  z-index: 5;
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .62);
  border: 1px solid rgba(78, 112, 146, .22);
  color: #4a5b6d;
  font-size: 12px;
  letter-spacing: .06em;
  backdrop-filter: blur(8px);
}
.lang-switch a { color: #4a5b6d; text-decoration: none; }
.lang-switch a:hover { color: var(--upper-gold); }
.lang-switch .on { color: var(--upper-ink); font-weight: 600; }

/* keep content off the seam */
.side-dao { padding-right: 11vw; }
.side-upper { padding-left: 11vw; }

@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; }
  .side { min-height: 50vh; padding: 10vh 8vw; }
  .side-dao { padding-right: 8vw; }
  .side-upper { padding-left: 8vw; }
  .side-upper .sun { width: 76px; height: 76px; font-size: 24px; top: 12%; right: 9%; }
  .seam {
    left: 0; right: 0; top: 50%; bottom: auto;
    width: auto; height: 120px;
    transform: translateY(-50%);
    background: linear-gradient(180deg,
      rgba(7, 10, 14, 0) 0%,
      rgba(7, 10, 14, .5) 30%,
      rgba(255, 255, 255, .5) 70%,
      rgba(255, 255, 255, 0) 100%);
    filter: blur(12px);
  }
  .seam::after {
    left: 8%; right: 8%; top: 50%; bottom: auto;
    width: auto; height: 1px;
    transform: translateY(-50%);
    background: linear-gradient(90deg, transparent, var(--gold) 18%, #f2dfb7 50%, var(--gold) 82%, transparent);
  }
  .topmark { top: 14px; font-size: 10px; }
  .lang-switch { top: 14px; right: 16px; padding: 5px 10px; }
  .title { font-size: clamp(38px, 11vw, 62px); }
}

/* changelog entry on the split home */
.history-link {
  position: fixed;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  z-index: 30;
  padding: 6px 15px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(10, 12, 14, 0.55);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: #cfc7b8;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.history-link:hover { color: #fff; border-color: rgba(201, 163, 92, 0.6); }

/* bottom links row on the split home */
.page-links {
  position: fixed;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  z-index: 30;
  display: flex;
  gap: 8px;
}
.page-links .history-link {
  position: static;
  left: auto;
  bottom: auto;
  transform: none;
}