:root {
  --paper: #eee5d3;
  --paper-deep: #dfd0b5;
  --ink: #1c1a17;
  --ink-soft: #5f584e;
  --ink-faint: rgba(28, 26, 23, 0.18);
  --cinnabar: #9e2f27;
  --cinnabar-deep: #73211c;
  --cinnabar-wash: rgba(158, 47, 39, 0.1);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --kai: "Kaiti SC", "STKaiti", "FZKai-Z03", serif;
  --ease: cubic-bezier(0.2, 0.75, 0.25, 1);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 280px;
  background: #d8c9ad;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 19% 12%, rgba(255, 255, 255, 0.38), transparent 25rem),
    radial-gradient(circle at 85% 72%, rgba(118, 83, 47, 0.12), transparent 30rem),
    linear-gradient(145deg, #f4eddf 0%, var(--paper) 48%, #e4d6bd 100%);
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
}

body::before,
body::after {
  position: fixed;
  z-index: 0;
  content: "";
  pointer-events: none;
  border: 1px solid rgba(28, 26, 23, 0.08);
}

body::before {
  inset: 18px;
}

body::after {
  inset: 24px;
  border-style: dotted;
}

.paper-grain {
  position: fixed;
  z-index: 0;
  inset: 0;
  opacity: 0.23;
  pointer-events: none;
  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='.72' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.19'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

button,
summary {
  font: inherit;
}

button {
  color: inherit;
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(100% - 40px, 850px);
  margin: 0 auto;
  padding: 72px 0 42px;
}

.masthead {
  text-align: center;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--cinnabar);
  font-size: 0.72rem;
  letter-spacing: 0.36em;
}

h1 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 17px;
  margin: 0;
  font-family: var(--kai);
  font-size: clamp(2.65rem, 8vw, 4.5rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  line-height: 1;
}

h1 span {
  color: var(--ink-soft);
  font-size: 0.45em;
  letter-spacing: 0.22em;
  writing-mode: vertical-rl;
}

h1 i {
  width: 1px;
  height: 1.1em;
  background: var(--cinnabar);
  transform: rotate(18deg);
}

.intro {
  max-width: 31rem;
  margin: 22px auto 0;
  color: var(--ink-soft);
  font-family: var(--kai);
  font-size: 1rem;
  letter-spacing: 0.12em;
  line-height: 1.8;
}

.divination-stage {
  margin-top: 44px;
}

.time-ribbon {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(100%, 580px);
  margin: 0 auto;
  padding: 9px 0;
  color: var(--ink-soft);
  border-top: 1px solid var(--ink-faint);
  border-bottom: 1px solid var(--ink-faint);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.time-ribbon span:last-child {
  text-align: right;
}

.time-ribbon strong {
  color: var(--ink);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  font-variant-numeric: tabular-nums;
}

.compass-wrap {
  position: relative;
  width: min(88vw, 430px);
  aspect-ratio: 1;
  margin: 28px auto 12px;
}

.orbit {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.orbit-outer {
  inset: 7%;
  border: 1px solid var(--ink-faint);
}

.orbit-outer::before,
.orbit-outer::after {
  position: absolute;
  inset: -5px 50%;
  content: "";
  width: 1px;
  background: var(--ink-faint);
}

.orbit-outer::after {
  transform: rotate(90deg);
}

.orbit-inner {
  inset: 27%;
  border: 1px dashed rgba(28, 26, 23, 0.16);
}

.palace-ring {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.palace-node {
  position: absolute;
  display: grid;
  place-items: center;
  width: 74px;
  height: 74px;
  border-radius: 50%;
  color: var(--ink-soft);
  transition:
    color 240ms var(--ease),
    transform 240ms var(--ease),
    background 240ms var(--ease),
    box-shadow 240ms var(--ease);
  transform: translate(-50%, -50%);
}

.palace-node em {
  position: absolute;
  top: 5px;
  color: rgba(28, 26, 23, 0.35);
  font-family: var(--kai);
  font-size: 0.58rem;
  font-style: normal;
}

.palace-node span {
  font-family: var(--kai);
  font-size: 1.15rem;
  letter-spacing: 0.08em;
}

.palace-node:nth-child(1) { left: 50%; top: 10%; }
.palace-node:nth-child(2) { left: 84.5%; top: 30%; }
.palace-node:nth-child(3) { left: 84.5%; top: 70%; }
.palace-node:nth-child(4) { left: 50%; top: 90%; }
.palace-node:nth-child(5) { left: 15.5%; top: 70%; }
.palace-node:nth-child(6) { left: 15.5%; top: 30%; }

.palace-node.is-passing {
  color: var(--cinnabar);
  background: var(--cinnabar-wash);
  transform: translate(-50%, -50%) scale(1.06);
}

.palace-node.is-active {
  color: #f4e9d6;
  background: var(--cinnabar);
  box-shadow: 0 8px 24px rgba(115, 33, 28, 0.28);
  transform: translate(-50%, -50%) scale(1.1);
}

.palace-node.is-active em {
  color: rgba(255, 255, 255, 0.62);
}

.seal-button {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  align-content: center;
  width: 130px;
  height: 130px;
  padding: 0;
  cursor: pointer;
  border: 2px solid var(--cinnabar);
  border-radius: 8px;
  outline: 1px solid rgba(158, 47, 39, 0.55);
  outline-offset: -7px;
  color: var(--cinnabar-deep);
  background: rgba(238, 229, 211, 0.78);
  box-shadow: 0 9px 30px rgba(65, 45, 27, 0.09);
  transform: translate(-50%, -50%) rotate(-2deg);
  transition:
    color 220ms var(--ease),
    background 220ms var(--ease),
    transform 220ms var(--ease),
    box-shadow 220ms var(--ease);
  -webkit-tap-highlight-color: transparent;
}

.seal-button::before,
.seal-button::after {
  position: absolute;
  content: "";
  width: 7px;
  height: 7px;
  border-color: currentColor;
  border-style: solid;
}

.seal-button::before {
  top: 12px;
  left: 12px;
  border-width: 1px 0 0 1px;
}

.seal-button::after {
  right: 12px;
  bottom: 12px;
  border-width: 0 1px 1px 0;
}

.seal-button:hover {
  color: #f7eddd;
  background: var(--cinnabar);
  box-shadow: 0 12px 36px rgba(115, 33, 28, 0.23);
  transform: translate(-50%, -50%) rotate(0deg) scale(1.025);
}

.seal-button:active {
  transform: translate(-50%, -50%) scale(0.97);
}

.seal-button:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 6px;
}

.seal-button:disabled {
  cursor: wait;
}

.seal-button__small,
.seal-button__main {
  display: block;
}

.seal-button__small {
  margin-bottom: 6px;
  font-size: 0.68rem;
  letter-spacing: 0.38em;
  text-indent: 0.38em;
}

.seal-button__main {
  font-family: var(--kai);
  font-size: 1.65rem;
  letter-spacing: 0.12em;
  text-indent: 0.12em;
}

.cast-hint {
  margin: 0;
  color: rgba(28, 26, 23, 0.54);
  text-align: center;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.error-message {
  max-width: 34rem;
  margin: 32px auto 0;
  padding: 14px 18px;
  color: var(--cinnabar-deep);
  border: 1px solid rgba(158, 47, 39, 0.35);
  background: rgba(238, 229, 211, 0.55);
  text-align: center;
  line-height: 1.7;
}

.result {
  width: min(100%, 620px);
  margin: 48px auto 0;
  animation: ink-arrive 650ms var(--ease) both;
}

.result-heading {
  text-align: center;
}

.result-kicker {
  color: var(--cinnabar);
  font-size: 0.7rem;
  letter-spacing: 0.36em;
}

.result-name-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 14px;
}

.result-seal {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  color: #f6e9d5;
  background: var(--cinnabar);
  font-family: var(--kai);
  font-size: 1.55rem;
  transform: rotate(-4deg);
}

.result h2 {
  margin: 0;
  font-family: var(--kai);
  font-size: clamp(3rem, 11vw, 5.4rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  line-height: 1;
}

.result-tone {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.32em;
}

.result-verdict {
  margin: 14px 0 0;
  font-family: var(--kai);
  font-size: clamp(1.1rem, 4vw, 1.42rem);
  letter-spacing: 0.08em;
  line-height: 1.8;
}

.details-panel {
  margin-top: 34px;
  border-top: 1px solid var(--ink-faint);
  border-bottom: 1px solid var(--ink-faint);
}

.details-panel summary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 17px;
  cursor: pointer;
  color: var(--ink-soft);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  list-style: none;
}

.details-panel summary::-webkit-details-marker {
  display: none;
}

.details-panel summary i {
  position: relative;
  width: 14px;
  height: 14px;
}

.details-panel summary i::before,
.details-panel summary i::after {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  content: "";
  background: var(--cinnabar);
  transition: transform 180ms ease;
}

.details-panel summary i::after {
  transform: rotate(90deg);
}

.details-panel[open] summary i::after {
  transform: rotate(0deg);
}

.details-panel summary:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: -4px;
}

.details-body {
  padding: 6px 12px 30px;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink-faint);
  border-bottom: 1px solid var(--ink-faint);
}

.detail-grid dl {
  margin: 0;
  padding: 20px 10px;
  text-align: center;
}

.detail-grid dl + dl {
  border-left: 1px solid var(--ink-faint);
}

.detail-grid dt,
.reading-block h3 {
  margin: 0;
  color: var(--cinnabar);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.24em;
}

.detail-grid dd {
  margin: 8px 0 0;
  font-family: var(--kai);
  font-size: 1.25rem;
}

.reading-block {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 18px;
  padding: 22px 5px;
  border-bottom: 1px dotted var(--ink-faint);
}

.reading-block h3 {
  padding-top: 4px;
}

.reading-block p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.9;
}

.advice-block p {
  color: var(--ink);
  font-family: var(--kai);
  font-size: 1.08rem;
}

.calculation {
  margin-top: 30px;
}

.section-label {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink-soft);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
}

.section-label::after {
  flex: 1;
  height: 1px;
  content: "";
  background: var(--ink-faint);
}

.snapshot-label,
.formula-label {
  color: var(--ink-soft);
  font-size: 0.78rem;
  line-height: 1.8;
}

.calculation-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 18px 0;
  padding: 0;
  list-style: none;
}

.calculation-steps li {
  position: relative;
  text-align: center;
}

.calculation-steps li:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -5px;
  content: "→";
  color: var(--cinnabar);
}

.calculation-steps span,
.calculation-steps strong {
  display: block;
}

.calculation-steps span {
  color: var(--ink-soft);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
}

.calculation-steps strong {
  margin-top: 7px;
  font-family: var(--kai);
  font-size: 1.18rem;
  font-weight: 400;
}

footer {
  max-width: 640px;
  margin: 76px auto 0;
  padding-top: 20px;
  color: rgba(28, 26, 23, 0.48);
  border-top: 1px solid var(--ink-faint);
  text-align: center;
  font-size: 0.68rem;
  line-height: 1.8;
}

footer p {
  margin: 2px 0;
}

noscript {
  position: fixed;
  z-index: 10;
  right: 20px;
  bottom: 20px;
  left: 20px;
  padding: 14px;
  color: white;
  background: var(--cinnabar-deep);
  text-align: center;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes ink-arrive {
  from { opacity: 0; transform: translateY(13px); filter: blur(3px); }
  to { opacity: 1; transform: translateY(0); filter: blur(0); }
}

@media (max-width: 520px) {
  body::before { inset: 9px; }
  body::after { inset: 14px; }

  .page-shell {
    width: min(100% - 30px, 850px);
    padding-top: 50px;
  }

  .intro {
    max-width: 19rem;
    font-size: 0.9rem;
  }

  .divination-stage {
    margin-top: 34px;
  }

  .time-ribbon {
    grid-template-columns: 1fr auto;
    row-gap: 6px;
  }

  .time-ribbon span:first-child {
    grid-column: 1 / -1;
    text-align: center;
  }

  .time-ribbon strong {
    font-size: 0.88rem;
  }

  .compass-wrap {
    width: min(98vw - 30px, 390px);
  }

  .palace-node {
    width: 60px;
    height: 60px;
  }

  .palace-node span {
    font-size: 1rem;
  }

  .palace-node em {
    top: 2px;
    font-size: 0.52rem;
  }

  .seal-button {
    width: 112px;
    height: 112px;
  }

  .seal-button__main {
    font-size: 1.4rem;
  }

  .result {
    margin-top: 40px;
  }

  .result-name-row {
    gap: 14px;
  }

  .result-seal {
    width: 40px;
    height: 40px;
    font-size: 1.3rem;
  }

  .reading-block {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 340px) {
  h1 { gap: 10px; }

  .compass-wrap {
    width: 270px;
  }

  .palace-node {
    width: 54px;
    height: 54px;
  }

  .seal-button {
    width: 98px;
    height: 98px;
  }

  .seal-button__main { font-size: 1.22rem; }
  .seal-button__small { font-size: 0.6rem; }

  .details-body { padding-inline: 2px; }
  .detail-grid dd { font-size: 1.05rem; }
  .calculation-steps strong { font-size: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}