:root {
  --black: #111111;
  --ink: #181818;
  --soft-ink: #4a4a47;
  --muted: #858580;
  --line: #deded9;
  --line-strong: #b9b9b3;
  --paper: #f7f7f3;
  --white: #ffffff;
  --mist: #efefeb;
  --success: #e5eee9;
  --danger: #f0e7e5;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --sans: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--serif);
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
}

button,
textarea,
input,
select {
  font: inherit;
}

button {
  color: inherit;
}

.masthead {
  width: min(720px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(70px, 12vh, 128px) 0 0;
  text-align: center;
}

.taiji-mark {
  position: relative;
  width: 38px;
  height: 38px;
  margin: 0 auto 26px;
  overflow: hidden;
  background: linear-gradient(90deg, var(--black) 50%, var(--white) 50%);
  border: 1px solid var(--black);
  border-radius: 50%;
}

.taiji-mark::before,
.taiji-mark::after {
  position: absolute;
  left: 9px;
  width: 18px;
  height: 18px;
  content: "";
  border-radius: 50%;
}

.taiji-mark::before {
  top: 0;
  background: var(--black);
}

.taiji-mark::after {
  bottom: 0;
  background: var(--white);
}

.taiji-mark span::before,
.taiji-mark span::after {
  position: absolute;
  left: 16px;
  z-index: 2;
  width: 5px;
  height: 5px;
  content: "";
  border-radius: 50%;
}

.taiji-mark span::before {
  top: 7px;
  background: var(--white);
}

.taiji-mark span::after {
  bottom: 7px;
  background: var(--black);
}

.eyebrow,
.kicker {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .28em;
}

h1 {
  margin: 8px 0 0;
  font-size: clamp(38px, 6vw, 54px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: .24em;
  text-indent: .24em;
}

.subtitle {
  margin: 16px 0 0;
  color: var(--soft-ink);
  font-size: 14px;
  letter-spacing: .22em;
  text-indent: .22em;
}

main {
  width: min(900px, calc(100% - 40px));
  margin: clamp(54px, 8vh, 84px) auto 100px;
}

.card {
  position: relative;
  background: transparent;
}

.card + .card {
  margin-top: 92px;
  padding-top: 42px;
  border-top: 1px solid var(--line);
}

.section-number {
  display: none;
}

.section-body {
  padding: 0;
}

h2 {
  margin: 8px 0 10px;
  font-size: clamp(25px, 4vw, 34px);
  font-weight: 520;
  line-height: 1.4;
  letter-spacing: .08em;
}

.guidance {
  max-width: 680px;
  margin: 0 0 30px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.8;
}

.inquiry {
  width: min(620px, 100%);
  margin: 0 auto;
  text-align: center;
}

.inquiry .guidance {
  margin-inline: auto;
}

.question-label {
  display: block;
  margin: 0 0 10px;
  color: var(--soft-ink);
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: .08em;
  text-align: left;
}

textarea {
  width: 100%;
  min-height: 126px;
  padding: 18px 20px;
  resize: vertical;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
  outline: 0;
  font-size: 17px;
  line-height: 1.85;
  transition: border-color .2s ease, box-shadow .2s ease;
}

textarea::placeholder {
  color: #b4b4af;
}

textarea:focus {
  border-color: var(--black);
  box-shadow: 0 0 0 3px rgba(17, 17, 17, .06);
}

textarea:disabled {
  color: var(--soft-ink);
  background: var(--mist);
}

.invite-settings {
  width: min(320px, 100%);
  margin: 14px auto 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 11px;
  text-align: left;
}

.invite-settings summary {
  cursor: pointer;
  text-align: center;
}

.invite-field {
  display: block;
  margin-top: 10px;
}

.invite-field input {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 10px 12px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: 0;
}

.invite-field input:focus {
  border-color: var(--black);
}

.inquiry-actions {
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  gap: 18px;
  margin-top: 34px;
}

#char-count {
  color: #aaa9a3;
  font-family: var(--sans);
  font-size: 11px;
}

button {
  border: 0;
  cursor: pointer;
  transition: transform .2s ease, background .2s ease, color .2s ease, opacity .2s ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:focus-visible {
  outline: 2px solid var(--black);
  outline-offset: 4px;
}

button:disabled {
  cursor: wait;
  opacity: .52;
}

.primary,
.secondary {
  padding: 12px 20px;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 13px;
}

.primary {
  color: var(--white);
  background: var(--black);
}

.primary:hover:not(:disabled) {
  background: #30302e;
}

.secondary {
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
}

.secondary:hover:not(:disabled) {
  background: var(--white);
}

.question-lock-button {
  min-width: 168px;
  padding: 14px 28px;
  letter-spacing: .12em;
}

.hidden {
  display: none !important;
}

.error {
  min-height: 1.5em;
  margin: 10px 0 0;
  color: #8b332c;
  font: 12px/1.6 var(--sans);
}

.ritual {
  width: min(620px, 100%);
  margin-inline: auto;
  text-align: center;
}

.ritual-head,
.interpretation-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  text-align: left;
}

.commit-chip {
  max-width: 230px;
  color: var(--muted);
  font: 10px/1.6 var(--sans);
  text-align: right;
}

.commit-chip span {
  display: block;
}

.commit-chip code {
  overflow-wrap: anywhere;
}

.ritual-button {
  position: relative;
  width: 132px;
  height: 132px;
  margin: 32px auto 0;
  padding: 0;
  color: var(--white);
  background: var(--black);
  border-radius: 50%;
  isolation: isolate;
  touch-action: manipulation;
  user-select: none;
  -webkit-touch-callout: none;
}

.ritual-button::before,
.ritual-button::after {
  position: absolute;
  inset: -12px;
  content: "";
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  pointer-events: none;
  transition: inset .2s ease, opacity .2s ease;
}

.ritual-button::after {
  opacity: 0;
}

.ritual-button.is-holding {
  transform: none;
  background: radial-gradient(circle at 50% 42%, #3b3b38 0, #20201e 62%, #111 100%);
}

.ritual-button.is-holding::before,
.ritual-button.is-holding::after {
  animation: ritual-ripple 1.8s ease-out infinite;
  border-color: rgba(31, 31, 29, .32);
}

.ritual-button.is-holding::after {
  animation-delay: .6s;
}

.ritual-taiji {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, .2);
  font: 74px/1 var(--serif);
  opacity: 0;
  transform: scale(.72) rotate(0deg);
  transition: opacity .3s ease, transform .45s ease;
}

.ritual-button.is-holding .ritual-taiji {
  opacity: 1;
  transform: scale(1) rotate(0deg);
  animation: taiji-turn 7.2s linear infinite;
}

.ritual-button-small {
  position: relative;
  z-index: 1;
  display: block;
  opacity: .62;
  font: 9px var(--sans);
  letter-spacing: .18em;
}

.ritual-button strong {
  position: relative;
  z-index: 1;
  display: block;
  margin-top: 5px;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: .12em;
}

@keyframes ritual-ripple {
  0% {
    inset: -8px;
    opacity: .58;
  }
  100% {
    inset: -46px;
    opacity: 0;
  }
}

@keyframes taiji-turn {
  to { transform: scale(1) rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .ritual-button.is-holding::before,
  .ritual-button.is-holding::after,
  .ritual-button.is-holding .ritual-taiji {
    animation: none;
  }

  .ritual-button.is-holding::before {
    inset: -20px;
    opacity: .4;
  }

  .ritual-button.is-holding::after {
    inset: -32px;
    opacity: .22;
  }
}

.local-note {
  max-width: 460px;
  margin: 28px auto 0;
  color: var(--muted);
  font: 11px/1.8 var(--sans);
}

.stage-results {
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.stage-result {
  display: grid;
  grid-template-columns: 92px 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 14px 0;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.stage-result h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
}

.stage-result p {
  margin: 0;
  color: var(--muted);
  font: 11px/1.7 var(--sans);
}

.stage-outcome {
  font-size: 17px;
  white-space: nowrap;
}

.result-heading {
  padding-bottom: 28px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}

.result-heading h2 {
  margin-bottom: 0;
  font-size: clamp(30px, 5vw, 43px);
  letter-spacing: .18em;
  text-indent: .18em;
}

.locked-question {
  width: min(600px, 100%);
  margin: 26px auto 42px;
  padding: 0 0 18px;
  color: var(--soft-ink);
  text-align: center;
  border-bottom: 1px solid var(--line);
}

.reading-layout {
  display: grid;
  grid-template-columns: minmax(320px, .95fr) minmax(260px, 1fr);
  align-items: center;
  gap: clamp(42px, 7vw, 78px);
}

.hexagrams {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.hex-card {
  text-align: center;
}

.hex-card h3 {
  margin: 0 0 24px;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: .08em;
}

.hex-card h3 small {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font: 10px var(--sans);
  letter-spacing: .18em;
}

.hex-lines {
  display: grid;
  width: min(100%, 150px);
  margin: 0 auto;
  gap: 12px;
}

.hex-line {
  position: relative;
  display: flex;
  justify-content: space-between;
  height: 14px;
}

.hex-line.yang {
  background: var(--black);
}

.hex-line.yin::before,
.hex-line.yin::after {
  width: 42%;
  height: 100%;
  content: "";
  background: var(--black);
}

.hex-line.moving {
  outline: 1px solid var(--black);
  outline-offset: 3px;
}

.hex-line.moving.yin {
  outline: 0;
}

.hex-line.moving.yin::before,
.hex-line.moving.yin::after {
  box-shadow: 0 0 0 1px var(--paper), 0 0 0 3px var(--black);
}

.result-summary {
  padding: 20px 0 20px 24px;
  border-left: 2px solid var(--black);
}

.result-summary h3 {
  margin: 6px 0 10px;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: .08em;
}

.result-summary > p:not(.kicker) {
  margin: 0;
  color: var(--soft-ink);
  font-size: 14px;
}

.result-meta {
  display: grid;
  gap: 7px;
  margin-top: 22px;
  color: var(--muted);
  font: 11px var(--sans);
}

.source-block {
  border-bottom: 1px solid var(--line);
}

.source-block:first-child {
  border-top: 1px solid var(--line);
}

.source-block summary {
  padding: 17px 2px;
  cursor: pointer;
  font-size: 16px;
}

.source-block p {
  margin: 10px 0 18px;
  text-align: justify;
}

.source-label {
  color: var(--muted);
  font: 10px var(--sans);
  letter-spacing: .08em;
}

.original-quote {
  padding-left: 18px;
  border-left: 2px solid var(--black);
}

.source-link {
  display: inline-block;
  margin-top: 16px;
  color: var(--soft-ink);
  font: 11px var(--sans);
}

.mode-chip {
  flex: 0 0 auto;
  padding: 7px 12px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  font: 10px var(--sans);
}

.interpret-button {
  min-width: 210px;
}

.interpret-loading {
  margin-top: 18px;
  color: var(--muted);
  font: 12px var(--sans);
}

.interpret-result {
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

.interpret-banner {
  padding: 22px 24px;
  color: var(--white);
  background: var(--black);
}

.interpret-banner strong {
  display: block;
  font-size: 20px;
  letter-spacing: .08em;
}

.interpret-banner p {
  margin: 7px 0 0;
  color: #c9c9c5;
  font: 11px/1.7 var(--sans);
}

.interpret-part {
  padding: 22px 2px;
  border-bottom: 1px solid var(--line);
}

.interpret-part.lead {
  padding-left: 20px;
  border-left: 2px solid var(--black);
}

.interpret-part h3 {
  margin: 0 0 8px;
  color: var(--soft-ink);
  font-size: 15px;
  font-weight: 600;
}

.interpret-part p {
  margin: 0;
  white-space: pre-wrap;
  text-align: justify;
}

.quality-details {
  margin-top: 18px;
}

.quality-details summary,
.receipt-details summary {
  cursor: pointer;
  color: var(--muted);
  font: 11px var(--sans);
}

.quality-details p {
  margin: 7px 0;
  font: 11px/1.7 var(--sans);
}

.feedback-panel {
  margin-top: 32px;
  padding: 24px;
  background: var(--mist);
  border-radius: 18px;
}

.feedback-panel h3 {
  margin: 4px 0 7px;
  font-size: 19px;
}

.feedback-privacy {
  margin: 0 0 20px;
  color: var(--muted);
  font: 11px/1.7 var(--sans);
}

.feedback-panel fieldset {
  margin: 0 0 18px;
  padding: 0;
  border: 0;
}

.feedback-panel legend,
.feedback-scores label,
.feedback-comment {
  font: 600 12px/1.6 var(--sans);
}

.feedback-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.feedback-options label {
  padding: 8px 12px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 999px;
  font: 11px var(--sans);
  cursor: pointer;
}

.feedback-options input,
.feedback-consent input {
  accent-color: var(--black);
}

.feedback-scores {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}

.feedback-scores label,
.feedback-comment {
  display: grid;
  gap: 6px;
}

.feedback-scores select {
  min-width: 0;
  padding: 10px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.feedback-comment textarea {
  min-height: 86px;
  padding: 12px;
  border-radius: 10px;
  font-size: 13px;
}

.feedback-consent {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin: 14px 0 18px;
  color: var(--muted);
  font: 11px/1.7 var(--sans);
}

.feedback-consent input {
  margin-top: 4px;
}

.feedback-status {
  display: inline;
  margin-left: 12px;
  color: #385849;
  font: 11px var(--sans);
}

.feedback-status.error {
  color: #8b332c;
}

.verification {
  margin: 20px 0;
  padding: 20px;
  background: var(--success);
  border-radius: 14px;
}

.verification.fail {
  background: var(--danger);
}

.verification strong {
  font-weight: 600;
}

.verification ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

.proof-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.receipt-details {
  margin-top: 20px;
}

pre {
  max-height: 430px;
  overflow: auto;
  padding: 18px;
  color: #ededeb;
  background: var(--black);
  border-radius: 12px;
  font: 10px/1.7 ui-monospace, monospace;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

footer {
  width: min(660px, calc(100% - 40px));
  margin: 0 auto;
  padding: 0 0 52px;
  color: var(--muted);
  text-align: center;
  font: 11px/1.8 var(--sans);
}

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

@media (max-width: 720px) {
  .masthead {
    width: calc(100% - 32px);
    padding-top: 58px;
  }

  .taiji-mark {
    margin-bottom: 20px;
  }

  main {
    width: calc(100% - 32px);
    margin-top: 48px;
  }

  .card + .card {
    margin-top: 68px;
    padding-top: 30px;
  }

  .ritual-head,
  .interpretation-head {
    align-items: center;
    flex-direction: column;
    text-align: center;
  }

  .commit-chip {
    max-width: 100%;
    text-align: center;
  }

  .reading-layout {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .hexagrams {
    width: min(380px, 100%);
    margin: 0 auto;
    gap: 18px;
  }

  .hex-lines {
    width: min(100%, 140px);
  }

  .result-summary {
    padding: 18px 0 18px 18px;
  }

  .stage-result {
    grid-template-columns: 74px 1fr;
    gap: 12px;
  }

  .stage-outcome {
    grid-column: 2;
  }

  .feedback-scores {
    grid-template-columns: 1fr;
  }

  .interpret-button {
    width: 100%;
  }
}

@media (max-width: 420px) {
  h1 {
    font-size: 36px;
  }

  .hex-card h3 {
    font-size: 15px;
  }

  .hex-lines {
    gap: 10px;
  }

  .hex-line {
    height: 12px;
  }

  .feedback-panel {
    padding: 20px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}