:root {
  --cover-ink: #24231f;
  --cover-muted: #7d786c;
  --cover-line-color: #d8d1c2;
  --cover-paper: #f4f0e6;
  --cover-paper-deep: #e9e3d5;
  --cover-accent: #b55238;
  --cover-accent-deep: #8d3928;
  --cover-dark: #2e302c;
}

body.cover-active { overflow: hidden; }

.site-cover {
  position: fixed;
  z-index: 1000;
  inset: 0;
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
  background: var(--cover-paper);
  color: var(--cover-ink);
  font-family: var(--sans);
}

.site-cover[hidden] { display: none; }

.site-cover::before {
  content: "";
  position: absolute;
  top: 50%;
  right: max(7vw, 72px);
  width: min(36vw, 470px);
  aspect-ratio: 1;
  border: 1px solid var(--cover-line-color);
  border-radius: 50%;
  background: transparent;
  transform: translateY(-48%);
}

.site-cover::after {
  content: "";
  position: absolute;
  top: 50%;
  right: calc(max(7vw, 72px) + min(3.4vw, 44px));
  width: min(29.2vw, 382px);
  aspect-ratio: 1;
  border: 1px solid rgba(216, 209, 194, .62);
  border-radius: 50%;
  transform: translateY(-48%);
}

.cover-frame {
  position: relative;
  z-index: 2;
  width: min(100%, 1360px);
  min-height: 100vh;
  min-height: 100svh;
  margin: 0 auto;
  padding: 30px 56px 28px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.cover-masthead,
.cover-footer { display: grid; align-items: center; }

.cover-masthead {
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--cover-line-color);
}

.cover-seal {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--cover-dark);
  color: #f6f1e6;
  font: 700 22px/1 var(--serif);
}

.cover-masthead p,
.cover-footer p,
.cover-footer small,
.cover-overline,
.cover-quote { margin: 0; letter-spacing: 0; }

.cover-masthead p {
  color: var(--cover-muted);
  font: 500 12px/1.5 var(--sans);
}

.cover-center {
  min-height: 0;
  padding: 38px 4vw 34px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, .78fr);
  align-items: center;
  gap: 7vw;
}

.cover-title-wrap { position: relative; z-index: 2; }

.cover-overline {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--cover-accent);
  font: 600 12px/1.5 var(--serif);
}

.cover-overline::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--cover-accent);
}

.cover-title-wrap h1 {
  margin: 17px 0 18px;
  color: var(--cover-ink);
  font: 800 104px/1 var(--serif);
  letter-spacing: 0;
  white-space: nowrap;
}

.cover-quote {
  color: var(--cover-muted);
  font: 500 18px/1.8 var(--serif);
}

.cover-hexagram {
  position: relative;
  z-index: 2;
  width: min(29vw, 330px);
  height: 300px;
  justify-self: center;
  display: flex;
  flex-direction: column-reverse;
  justify-content: center;
  gap: 19px;
}

.cover-hexagram::before {
  content: "既济";
  position: absolute;
  top: 50%;
  left: -62px;
  width: 1em;
  color: var(--cover-accent);
  font: 600 15px/1.45 var(--serif);
  transform: translateY(-50%);
}

.cover-hexagram::after {
  content: "水火相济";
  position: absolute;
  right: -47px;
  bottom: 35px;
  color: var(--cover-muted);
  font: 500 10px/1 var(--serif);
  letter-spacing: 0;
  writing-mode: vertical-rl;
}

.cover-line {
  width: 100%;
  height: 15px;
  display: flex;
  gap: 34px;
  margin: 0;
}

.cover-line b {
  flex: 1;
  display: block;
  background: var(--cover-dark);
  box-shadow: 0 5px 0 rgba(46, 48, 44, .09);
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  animation: cover-line-arrive 760ms cubic-bezier(.2, .75, .2, 1) forwards;
}

.cover-line:nth-child(even) b { transform-origin: right; }
.cover-line:nth-child(1) b { animation-delay: 100ms; }
.cover-line:nth-child(2) b { animation-delay: 180ms; }
.cover-line:nth-child(3) b { animation-delay: 260ms; }
.cover-line:nth-child(4) b { animation-delay: 340ms; }
.cover-line:nth-child(5) b { animation-delay: 420ms; }
.cover-line:nth-child(6) b { animation-delay: 500ms; }

.cover-footer {
  grid-template-columns: 1fr auto 1fr;
  gap: 28px;
  min-height: 68px;
  padding-top: 22px;
  border-top: 1px solid var(--cover-line-color);
}

.cover-footer p,
.cover-footer small { color: var(--cover-muted); font: 11px/1.5 var(--serif); }
.cover-footer small { justify-self: end; }

.cover-enter {
  position: static;
  min-width: 176px;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--cover-accent);
  border-radius: 2px;
  background: var(--cover-accent);
  color: #fff;
  cursor: pointer;
  font: 600 12px/1 var(--sans);
  letter-spacing: 0;
  transition: background-color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.cover-enter::after {
  content: "→";
  display: inline;
  width: auto;
  height: auto;
  margin-left: 18px;
  background: transparent;
  color: currentColor;
  font: 16px/1 var(--sans);
  vertical-align: -1px;
}

.cover-enter:hover {
  border-color: var(--cover-accent-deep);
  background: var(--cover-accent-deep);
  color: #fff;
  transform: translateY(-1px);
}

.cover-enter:focus-visible {
  outline: 3px solid rgba(181, 82, 56, .3);
  outline-offset: 4px;
}

.cover-orbit { display: none; }

.cover-noscript {
  position: absolute;
  z-index: 4;
  left: 56px;
  bottom: 10px;
  margin: 0;
  color: var(--cover-accent);
  font-size: 11px;
}

.site-cover.is-leaving {
  pointer-events: none;
  animation: cover-depart 640ms cubic-bezier(.72, 0, .2, 1) forwards;
}

.site-cover.is-leaving .cover-line:nth-child(odd) { transform: translateX(26px); }
.site-cover.is-leaving .cover-line:nth-child(even) { transform: translateX(-26px); }
.site-cover.is-leaving .cover-line { transition: transform 500ms cubic-bezier(.72, 0, .2, 1); }

@keyframes cover-line-arrive {
  to { opacity: 1; transform: scaleX(1); }
}

@keyframes cover-depart {
  0% { opacity: 1; transform: translateY(0); }
  62% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-18px); }
}

@media (max-width: 900px) {
  .site-cover::before { right: 5vw; width: min(40vw, 410px); }
  .site-cover::after { right: calc(5vw + 34px); width: min(31vw, 332px); }
  .cover-frame { padding-right: 38px; padding-left: 38px; }
  .cover-center { grid-template-columns: minmax(0, 1fr) minmax(280px, .75fr); gap: 5vw; padding-right: 2vw; padding-left: 2vw; }
  .cover-title-wrap h1 { font-size: 82px; }
  .cover-hexagram { width: min(31vw, 285px); }
}

@media (max-width: 680px) {
  .site-cover::before {
    top: auto;
    right: 50%;
    bottom: 11vh;
    width: min(78vw, 330px);
    transform: translateX(50%);
  }
  .site-cover::after {
    top: auto;
    right: 50%;
    bottom: calc(11vh + 28px);
    width: min(64vw, 274px);
    transform: translateX(50%);
  }
  .cover-frame { padding: 20px 20px 18px; }
  .cover-masthead { padding-bottom: 14px; }
  .cover-seal { width: 36px; height: 36px; font-size: 20px; }
  .cover-masthead p { font-size: 10px; }
  .cover-center {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(205px, 1fr);
    gap: 7px;
    padding: 24px 0 8px;
    text-align: center;
  }
  .cover-title-wrap { align-self: center; }
  .cover-overline { justify-content: center; font-size: 11px; }
  .cover-overline::before { width: 22px; }
  .cover-title-wrap h1 { margin: 10px 0 11px; font-size: 60px; white-space: normal; }
  .cover-quote { font-size: 14px; }
  .cover-hexagram { width: min(62vw, 238px); height: min(29vh, 235px); gap: 12px; align-self: center; }
  .cover-line { height: 11px; gap: 25px; }
  .cover-line b { box-shadow: 0 4px 0 rgba(46, 48, 44, .08); }
  .cover-hexagram::before { left: -35px; font-size: 12px; }
  .cover-hexagram::after { right: -28px; bottom: 22px; font-size: 9px; }
  .cover-footer { min-height: 65px; grid-template-columns: 1fr; padding-top: 14px; justify-items: center; }
  .cover-footer p,
  .cover-footer small { display: none; }
  .cover-enter { min-width: 180px; min-height: 48px; }
  .cover-noscript { left: 20px; right: 20px; bottom: 4px; text-align: center; }
}

@media (max-height: 620px) and (min-width: 681px) {
  .cover-frame { padding-top: 20px; padding-bottom: 18px; }
  .cover-center { padding-top: 10px; padding-bottom: 10px; }
  .cover-title-wrap h1 { margin-top: 8px; margin-bottom: 10px; font-size: 76px; }
  .cover-hexagram { width: 260px; height: 230px; gap: 13px; }
  .cover-footer { min-height: 56px; padding-top: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .site-cover,
  .site-cover *,
  .site-cover *::before,
  .site-cover *::after {
    animation-duration: .001ms !important;
    animation-delay: 0ms !important;
    transition-duration: .001ms !important;
  }
  .cover-line b { opacity: 1; transform: scaleX(1); }
}