/* ───────────── 色と書体 ───────────── */

:root {
  --font-ui: 'Zen Kaku Gothic New', 'Hiragino Sans', sans-serif;
  --font-mincho: 'Shippori Mincho', 'Hiragino Mincho ProN', serif;
  --code-font: 'IBM Plex Mono', 'IBM Plex Sans JP', monospace;
  --code-size: 16.5px;
  --code-leading: 2.1;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* 和紙：生成りの紙に墨、薄墨、朱 */
:root,
:root[data-theme='washi'] {
  --paper: #f1ece1;
  --paper-sheet: #f8f5ed;
  --ink: #1d1b18;
  --ink-soft: #57524a;
  --ink-faint: #8d8679;
  --usuzumi: #c6beae;
  --usuzumi-next: #8d8679;
  --rule: rgba(70, 52, 24, 0.075);
  --line: rgba(29, 27, 24, 0.14);
  --gutter: #bdb5a5;
  --shu: #c23b22;
  --shu-soft: rgba(194, 59, 34, 0.11);
  --seal-text: #f8f5ed;
  --seal-blend: multiply;
  --selection: rgba(47, 74, 109, 0.15);
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset, 0 18px 40px -28px rgba(60, 45, 20, 0.35);
  --grain-opacity: 0.35;

  --hl-keyword: #2f4a6d; /* 藍 */
  --hl-function: #2b2824;
  --hl-number: #8a4b2d; /* 弁柄 */
  --hl-string: #7a6331; /* 金茶 */
  --hl-comment: #6e6557;
  --hl-punct: #6f685d;
  color-scheme: light;
}

/* 夜：墨地に金泥 */
:root[data-theme='yoru'] {
  --paper: #11100e;
  --paper-sheet: #181614;
  --ink: #ebe4d2;
  --ink-soft: #b5ac98;
  --ink-faint: #7f7768;
  --usuzumi: #3e3a33;
  --usuzumi-next: #8a8068;
  --rule: rgba(235, 228, 210, 0.05);
  --line: rgba(235, 228, 210, 0.13);
  --gutter: #4f4a40;
  --shu: #d4553c;
  --shu-soft: rgba(212, 85, 60, 0.16);
  --seal-text: #181614;
  --seal-blend: normal;
  --selection: rgba(201, 169, 97, 0.2);
  --shadow: 0 18px 40px -24px rgba(0, 0, 0, 0.7);
  --grain-opacity: 0.12;

  --hl-keyword: #c9a961; /* 金泥 */
  --hl-function: #e9dfc6;
  --hl-number: #d48c68;
  --hl-string: #b8a46f;
  --hl-comment: #9a907b;
  --hl-punct: #9a917f;
  color-scheme: dark;
}

:root[data-font='plex'] {
  --code-font: 'IBM Plex Mono', 'IBM Plex Sans JP', monospace;
}
:root[data-font='jb'] {
  --code-font: 'JetBrains Mono', 'BIZ UDGothic', monospace;
}
:root[data-font='mplus'] {
  --code-font: 'M PLUS 1 Code', monospace;
}

/* ───────────── 土台 ───────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--paper);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
}

/* 紙の繊維のような、ごく薄いざらつき */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: var(--grain-opacity);
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.35 0 0 0 0 0.3 0 0 0 0 0.22 0 0 0 0.18 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  z-index: 0;
}

:root[data-theme='yoru'] body::before {
  mix-blend-mode: screen;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 1px solid var(--ink-soft);
  outline-offset: 3px;
}

/* ───────────── 上部 ───────────── */

.top {
  position: relative;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  max-width: 1320px;
  margin: 0 auto;
  padding: 22px 40px;
  border-bottom: 1px solid var(--line);
}

a {
  color: inherit;
}

[hidden] {
  display: none !important;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
  justify-self: start;
  text-decoration: none;
}

.brand-ja {
  font-family: var(--font-mincho);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.32em;
}

.brand-en {
  font-size: 10px;
  letter-spacing: 0.42em;
  color: var(--ink-faint);
}

.stages {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mincho);
  font-size: 17px;
}

.stage {
  color: var(--usuzumi);
  position: relative;
  padding-bottom: 2px;
}

a.stage {
  text-decoration: none;
}

a.stage[href] {
  color: var(--ink-faint);
  transition: color 0.2s;
}

a.stage[href]:hover {
  color: var(--ink);
}

a.stage[aria-disabled='true'] {
  cursor: not-allowed;
}

.stage.is-current,
a.stage.is-current[href] {
  color: var(--ink);
}

.stage.is-current::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -6px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--shu);
  transform: translateX(-50%);
}

.stage-dot {
  width: 18px;
  height: 1px;
  background: var(--line);
}

.text-btn {
  justify-self: end;
  padding: 4px 0;
  border: 0;
  background: none;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
  transition: color 0.2s;
}

.text-btn:hover {
  color: var(--ink);
}

/* ───────────── 設定（試作用） ───────────── */

.settings {
  position: fixed;
  z-index: 30;
  top: 68px;
  right: max(40px, calc((100vw - 1320px) / 2 + 40px));
  width: 360px;
  padding: 22px 22px 8px;
  background: var(--paper-sheet);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.settings-note {
  margin: 0 0 16px;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
}

.setting {
  margin-bottom: 18px;
}

.setting-label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--ink-soft);
}

.seg {
  display: grid;
  gap: 6px;
}

.seg-2 {
  grid-template-columns: 1fr 1fr;
}

.seg button {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  padding: 8px 12px;
  text-align: left;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-faint);
  transition: border-color 0.2s, color 0.2s;
}

.seg button[aria-pressed='true'] {
  border-color: var(--ink);
  color: var(--ink);
}

.seg-main {
  font-size: 13px;
}

.seg-sub {
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

/* ───────────── 本体 ───────────── */

.layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(320px, 0.82fr);
  gap: 0 64px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 52px 40px 96px;
}

/* 見出しは二列の上にまたがせ、写経用紙とキャンバスの上端をそろえる */
.sheet-head {
  grid-column: 1 / -1;
}

.sutra-head {
  margin-bottom: 18px;
}

.eyebrow {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin: 0;
  font-family: var(--font-mincho);
  font-size: 14px;
  letter-spacing: 0.3em;
  color: var(--ink-soft);
}

.eyebrow-en {
  font-family: var(--font-ui);
  font-size: 10px;
  letter-spacing: 0.42em;
  color: var(--ink-faint);
}

h1 {
  margin: 6px 0 4px;
  font-family: var(--font-mincho);
  font-size: 46px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.24em;
}

.subtitle {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--ink-soft);
}

.howto {
  margin: 0 0 26px;
  padding-left: 14px;
  border-left: 1px solid var(--shu);
  font-size: 13px;
  line-height: 2;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

/* 写経用紙 */
.paper {
  background: var(--paper-sheet);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  transition: background-color 0.4s var(--ease);
}

/* エディタ：透明な textarea と、その下に描く層。二つの文字組みは必ずそろえる */
.sk-editor {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  cursor: text;
}

.sk-gutter {
  min-width: 46px;
  padding-right: 10px;
  border-right: 1px solid var(--rule);
  font-family: var(--code-font);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--gutter);
  text-align: right;
  user-select: none;
}

.sk-num {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.sk-scroll {
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
}

.sk-layer,
.sk-input {
  margin: 0;
  padding: 18px 22px 28px 16px;
  font-family: var(--code-font);
  font-size: var(--code-size);
  line-height: var(--code-leading);
  letter-spacing: 0;
  font-kerning: none;
  font-variant-ligatures: none;
  font-feature-settings: 'liga' 0, 'calt' 0;
  tab-size: 2;
  white-space: pre;
  word-wrap: normal;
}

.sk-layer {
  display: inline-block;
  min-width: 100%;
  color: var(--ink);
  pointer-events: none;
}

.sk-line {
  box-shadow: inset 0 -1px 0 var(--rule);
}

.sk-input {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  border: 0;
  outline: none;
  resize: none;
  overflow: hidden;
  background: transparent;
  color: transparent;
  -webkit-text-fill-color: transparent;
  caret-color: var(--ink);
}

.sk-input::selection {
  background: var(--selection);
  color: transparent;
}

/* 色分け */
.tk-kw {
  color: var(--hl-keyword);
}
.tk-fn {
  color: var(--hl-function);
}
.tk-num {
  color: var(--hl-number);
}
.tk-str {
  color: var(--hl-string);
}
.tk-com {
  color: var(--hl-comment);
}
.tk-punct {
  color: var(--hl-punct);
}

/* 薄墨の手本と、次に書く一字 */
.ghost {
  color: var(--usuzumi);
}

.ghost-next {
  color: var(--usuzumi-next);
}

/* 手本と違う字 */
.miss {
  color: var(--shu);
  background: var(--shu-soft);
  text-decoration: underline wavy var(--shu);
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

/* 変換中の字 */
.comp {
  color: var(--ink);
  text-decoration: underline dotted var(--ink-faint);
  text-underline-offset: 5px;
}

/* 書いたばかりの一字が、墨のようににじんで定着する */
.fresh {
  animation: ink-settle 0.5s var(--ease);
}

@keyframes ink-settle {
  from {
    opacity: 0.25;
    text-shadow: 0 0 7px currentColor;
  }
  to {
    opacity: 1;
    text-shadow: 0 0 0 transparent;
  }
}

/* 進捗 */
.progress {
  margin-top: 18px;
}

.bar {
  height: 1px;
  background: var(--line);
  overflow: hidden;
}

.bar span {
  display: block;
  height: 100%;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}

.is-complete .bar span {
  background: var(--shu);
}

.progress-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}

.stats {
  display: flex;
  gap: 32px;
  margin: 0;
}

.stats div {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.stats dt {
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--ink-faint);
}

.stats dd {
  margin: 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
}

.hint {
  min-height: 1.8em;
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.hint.is-done {
  color: var(--ink);
}

/* ───────────── 実行 ───────────── */

.stage-panel {
  position: sticky;
  top: 28px;
  align-self: start;
  padding-top: 0;
}

.canvas-frame {
  position: relative;
  aspect-ratio: 1;
  background: var(--paper-sheet);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.canvas-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  opacity: 0;
  transition: opacity 0.6s var(--ease);
}

.is-running .canvas-frame iframe {
  opacity: 1;
}

.canvas-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
  transition: opacity 0.3s;
  pointer-events: none;
}

.is-running .canvas-empty {
  opacity: 0;
}

.run-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
}

.kbd {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.btn-ink,
.btn-line,
.btn-shu {
  padding: 10px 26px;
  font-size: 13px;
  letter-spacing: 0.4em;
  text-indent: 0.4em;
  border: 1px solid transparent;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s, opacity 0.2s;
}

.btn-ink {
  background: var(--ink);
  color: var(--paper-sheet);
}

.btn-ink:hover {
  opacity: 0.86;
}

.btn-line {
  background: transparent;
  border-color: var(--line);
  color: var(--ink-soft);
}

.btn-line:hover {
  border-color: var(--ink-soft);
  color: var(--ink);
}

.run-msg {
  min-height: 1.8em;
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.run-msg.is-error span {
  display: block;
}

.run-msg small {
  display: block;
  margin-top: 4px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--ink-faint);
  word-break: break-all;
}

.offer {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.btn-shu {
  font-family: var(--font-mincho);
  font-size: 15px;
  background: transparent;
  border-color: var(--shu);
  color: var(--shu);
}

.btn-shu:disabled {
  opacity: 0.32;
  cursor: not-allowed;
}

.btn-shu:not(:disabled) {
  background: var(--shu);
  color: var(--seal-text);
  animation: offer-breathe 2.6s ease-in-out infinite;
}

@keyframes offer-breathe {
  50% {
    box-shadow: 0 0 0 6px var(--shu-soft);
  }
}

.offer-note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

/* ───────────── 御朱印 ───────────── */

.seal-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

.seal-overlay.is-open {
  opacity: 1;
}

.seal-overlay.is-leaving {
  opacity: 0;
}

.seal-page {
  display: flex;
  align-items: center;
  gap: 56px;
}

.seal-sheet {
  position: relative;
  width: 300px;
  height: 420px;
  background: var(--paper-sheet);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.seal-sheet p {
  position: absolute;
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mincho);
}

.seal-houno {
  top: 34px;
  right: 38px;
  font-size: 17px;
  letter-spacing: 0.6em;
  color: var(--ink);
}

.seal-title {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 66px;
  font-weight: 600;
  letter-spacing: 0.32em;
  color: var(--ink);
}

.seal-date {
  bottom: 34px;
  left: 34px;
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--ink-soft);
}

.seal-small {
  position: absolute;
  top: 34px;
  left: 30px;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1.5px solid var(--shu);
  border-radius: 50%;
  color: var(--shu);
  font-family: var(--font-mincho);
  font-size: 10px;
  letter-spacing: 0.05em;
  opacity: 0;
}

.seal-mark {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 136px;
  height: 136px;
  mix-blend-mode: var(--seal-blend);
  opacity: 0;
  transform: translate(-50%, -50%) rotate(-5deg) scale(1.6);
}

.is-open .seal-title,
.is-open .seal-houno,
.is-open .seal-date {
  animation: ink-in 1.1s var(--ease) both;
}

.is-open .seal-houno {
  animation-delay: 0.1s;
}

.is-open .seal-date {
  animation-delay: 0.25s;
}

.is-open .seal-mark {
  animation: seal-press 0.42s cubic-bezier(0.5, 0, 0.75, 0) 0.15s forwards;
}

.is-open .seal-small {
  animation: fade-in 0.6s var(--ease) 0.8s forwards;
}

@keyframes ink-in {
  from {
    opacity: 0;
    filter: blur(4px);
  }
  to {
    opacity: 1;
    filter: blur(0);
  }
}

@keyframes seal-press {
  70% {
    opacity: 0.92;
    transform: translate(-50%, -50%) rotate(-5deg) scale(0.97);
  }
  to {
    opacity: 0.9;
    transform: translate(-50%, -50%) rotate(-5deg) scale(1);
  }
}

@keyframes fade-in {
  to {
    opacity: 0.85;
  }
}

.seal-caption {
  max-width: 360px;
}

.seal-caption p {
  margin: 0;
}

.seal-eyebrow {
  font-size: 11px;
  letter-spacing: 0.5em;
  color: var(--shu);
}

.seal-message {
  margin-top: 10px !important;
  font-family: var(--font-mincho);
  font-size: 22px;
  line-height: 1.7;
  letter-spacing: 0.08em;
}

.seal-stats {
  margin: 14px 0 28px !important;
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--ink-soft);
}

.seal-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.seal-actions a {
  text-decoration: none;
}

.seal-actions .text-btn {
  margin-left: 8px;
}

/* ───────────── 写経画面：戻る・破 ───────────── */

.back {
  display: inline-block;
  margin-bottom: 22px;
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--ink-faint);
  text-decoration: none;
  transition: color 0.2s;
}

.back::before {
  content: '←';
  margin-right: 10px;
  letter-spacing: 0;
}

.back:hover {
  color: var(--ink);
}

.mode-badge {
  padding: 1px 7px 2px;
  border: 1px solid var(--shu);
  color: var(--shu);
  font-family: var(--font-mincho);
  font-size: 12px;
  letter-spacing: 0;
}

.offer-note a {
  color: var(--shu);
  text-underline-offset: 4px;
}

.ha {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.ha-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--ink-soft);
}

.ha-hints {
  display: grid;
  gap: 14px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.ha-hints li {
  display: grid;
  gap: 2px;
  padding-left: 14px;
  border-left: 1px solid var(--shu);
}

.ha-hints code {
  font-family: var(--code-font);
  font-size: 13px;
  color: var(--ink);
  font-variant-ligatures: none;
}

.ha-hints span {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ───────────── 十の経の動き（一覧） ───────────── */

.gallery-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.gallery-list button {
  display: grid;
  grid-template-columns: 112px 96px 1fr auto;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  padding: 16px 20px;
  text-align: left;
  background: var(--paper-sheet);
  border: 1px solid var(--line);
  transition: border-color 0.2s, transform 0.2s var(--ease);
}

.gallery-list button:hover {
  border-color: var(--ink-faint);
}

.gallery-list button[aria-pressed='true'] {
  border-color: var(--ink);
  box-shadow: var(--shadow);
}

.cand-numeral {
  font-family: var(--font-mincho);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}

.cand-title {
  font-family: var(--font-mincho);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.2em;
}

.cand-sub {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.cand-lines {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--ink-faint);
}

.play-note {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--shu);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.play-note:empty {
  display: none;
}

/* ───────────── 納経帳（一覧） ───────────── */

.list-layout {
  position: relative;
  z-index: 1;
  max-width: 1320px;
  margin: 0 auto;
  padding: 52px 40px 96px;
}

.list-head {
  margin-bottom: 44px;
}

.lead {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 2;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.list-summary {
  margin: 18px 0 0;
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--ink-faint);
}

.sutra-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card-inner {
  position: relative;
  display: block;
  aspect-ratio: 3 / 4;
  background: var(--paper-sheet);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s;
}

a.card-inner:hover {
  transform: translateY(-3px);
  border-color: var(--ink-faint);
}

.card-numeral {
  position: absolute;
  top: 18px;
  right: 16px;
  writing-mode: vertical-rl;
  font-family: var(--font-mincho);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--ink-soft);
}

.card-title {
  position: absolute;
  top: 46%;
  left: 50%;
  transform: translate(-50%, -50%);
  writing-mode: vertical-rl;
  font-family: var(--font-mincho);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0.25em;
}

.card-sub,
.card-status {
  position: absolute;
  left: 14px;
  right: 14px;
  text-align: center;
  font-size: 11px;
  line-height: 1.6;
}

.card-sub {
  bottom: 46px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.card-status {
  bottom: 16px;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}

.card-bar {
  display: block;
  height: 1px;
  margin-top: 6px;
  background: var(--line);
}

.card-bar span {
  display: block;
  height: 100%;
  background: var(--ink);
  transform-origin: left;
}

.card-seal {
  position: absolute;
  top: 46%;
  left: 50%;
  width: 66px;
  height: 66px;
  transform: translate(-50%, -50%) rotate(-6deg);
  opacity: 0.88;
  mix-blend-mode: var(--seal-blend);
}

.is-offered .card-status {
  color: var(--shu);
}

.is-open .card-inner {
  border-color: var(--ink);
}

.is-open .card-status {
  color: var(--ink);
}

.is-locked .card-inner {
  opacity: 0.45;
  box-shadow: none;
}

.is-soon .card-inner {
  background: transparent;
  border-style: dashed;
  box-shadow: none;
}

.is-soon .card-numeral,
.is-soon .card-status {
  color: var(--usuzumi);
}

.otakiage-gate {
  margin-top: 48px;
  padding: 30px 24px;
  border: 1px dashed var(--line);
  text-align: center;
}

.otakiage-title {
  margin: 0;
  font-family: var(--font-mincho);
  font-size: 20px;
  letter-spacing: 0.5em;
  text-indent: 0.5em;
  color: var(--usuzumi);
}

.otakiage-note {
  margin: 6px 0 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
}

/* ───────────── 破：この行は何？ ───────────── */

.ask {
  margin: 4px 0 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.ask-note {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

.ask button:disabled {
  opacity: 0.5;
  cursor: wait;
}

.ask-answer:empty {
  display: none;
}

.ask-answer {
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--paper-sheet);
  border: 1px solid var(--line);
}

.ask-line {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.ask-line code {
  font-family: var(--code-font);
  font-size: 12px;
  color: var(--ink);
  white-space: pre-wrap;
  word-break: break-all;
}

.ask-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--ink);
}

.ask-text.is-waiting,
.is-waiting {
  color: var(--ink-faint);
  animation: breathe 1.6s ease-in-out infinite;
}

.ask-text.is-error {
  color: var(--shu);
}

@keyframes breathe {
  50% {
    opacity: 0.45;
  }
}

/* ───────────── 離 ───────────── */

.ri-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.3fr) minmax(300px, 0.9fr);
  grid-template-areas:
    'head head head'
    'chat code stage';
  gap: 0 36px;
  max-width: 1440px;
  margin: 0 auto;
  padding: 52px 40px 96px;
}

.ri-head {
  grid-area: head;
  margin-bottom: 28px;
}

.ri-chat {
  grid-area: chat;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-self: start;
  position: sticky;
  top: 28px;
}

.ri-code {
  grid-area: code;
  min-width: 0;
}

.ri-stage {
  grid-area: stage;
}

.chat-log {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 52vh;
  overflow-y: auto;
  padding-right: 4px;
}

.chat-empty {
  margin: 0;
  font-size: 12px;
  line-height: 1.9;
  color: var(--ink-faint);
}

.msg {
  padding: 10px 14px 12px;
  border: 1px solid var(--line);
  background: var(--paper-sheet);
}

.msg.is-user {
  margin-left: 28px;
  background: transparent;
}

.msg.is-ai {
  margin-right: 12px;
  border-left: 2px solid var(--ink);
}

.msg.is-error {
  border-left-color: var(--shu);
}

.msg.is-error .msg-text {
  color: var(--shu);
}

.msg-who {
  margin: 0 0 4px;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
}

.msg-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  white-space: pre-wrap;
}

.msg-note {
  margin: 6px 0 0;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--shu);
}

.chat-ideas {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.idea {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  transition: border-color 0.2s, color 0.2s;
}

.idea:hover {
  border-color: var(--ink-soft);
  color: var(--ink);
}

.chat-form textarea,
.ri-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: var(--paper-sheet);
  font: inherit;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink);
  resize: vertical;
  outline: none;
}

.chat-form textarea:focus,
.ri-form textarea:focus {
  border-color: var(--ink-soft);
}

.chat-send {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}

.chat-send .kbd {
  margin-left: 0;
}

.chat-send button:disabled {
  opacity: 0.5;
  cursor: wait;
}

.ri-code-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}

.ri-diff {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.ri-fix {
  margin-top: 4px;
}

.ri-stage .btn-shu {
  background: var(--shu);
  color: var(--seal-text);
}

.ri-dialog {
  width: min(560px, calc(100vw - 32px));
  max-height: calc(100vh - 48px);
  padding: 32px 32px 28px;
  border: 1px solid var(--line);
  background: var(--paper-sheet);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.ri-dialog::backdrop {
  background: color-mix(in srgb, var(--paper) 80%, transparent);
  backdrop-filter: blur(4px);
}

.ri-form {
  display: grid;
  gap: 16px;
}

.ri-dialog-title {
  margin: 0;
  font-family: var(--font-mincho);
  font-size: 24px;
  letter-spacing: 0.12em;
}

.ri-form-msg {
  min-height: 1.5em;
  margin: 0;
  font-size: 12px;
  color: var(--shu);
}

/* ───────────── お焚き上げ・結願証 ───────────── */

.ota-layout {
  position: relative;
  z-index: 1;
  max-width: 1120px;
  margin: 0 auto;
  padding: 52px 40px 96px;
}

.ota-intro {
  max-width: 560px;
}

.ota-locked,
.ota-trial {
  margin: 28px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--shu);
  font-size: 13px;
  line-height: 2;
  color: var(--ink-soft);
}

.ota-form {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}

.field {
  display: grid;
  gap: 6px;
}

.field-label {
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--ink-soft);
}

.field input {
  padding: 10px 2px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  font-family: var(--font-mincho);
  font-size: 20px;
  letter-spacing: 0.1em;
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s;
}

.field input:focus {
  border-bottom-color: var(--ink);
}

.field-note {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.ota-form .btn-shu {
  justify-self: start;
  margin-top: 8px;
  background: var(--shu);
  color: var(--seal-text);
}

/* 燃やしている間は、画面いっぱいの闇 */
.ota-stage {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: #0c0a0a;
  opacity: 0;
  transition: opacity 1.2s var(--ease);
}

.ota-stage.is-open {
  opacity: 1;
}

.ota-stage iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.ota-caption {
  position: absolute;
  left: 50%;
  bottom: 28px;
  margin: 0;
  transform: translateX(-50%);
  font-family: var(--font-mincho);
  font-size: 13px;
  letter-spacing: 0.6em;
  color: rgba(236, 224, 200, 0.45);
  pointer-events: none;
}

.ota-skip {
  position: absolute;
  right: 28px;
  bottom: 24px;
  padding: 4px 0;
  border: 0;
  background: none;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: rgba(236, 224, 200, 0.35);
}

.ota-skip:hover {
  color: rgba(236, 224, 200, 0.8);
}

.ota-cert {
  display: grid;
  grid-template-columns: minmax(0, 520px) minmax(0, 1fr);
  align-items: center;
  gap: 64px;
}

.cert-frame {
  box-shadow: var(--shadow);
  animation: ink-in 1.4s var(--ease) both;
}

.cert-frame canvas {
  display: block;
  width: 100%;
  height: auto;
}

.cert-message {
  margin: 10px 0 0;
  font-family: var(--font-mincho);
  font-size: 26px;
  letter-spacing: 0.12em;
}

.cert-date {
  margin: 8px 0 28px;
  font-family: var(--font-mincho);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}

.cert-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.cert-actions a {
  text-decoration: none;
}

.cert-ri {
  margin: 36px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 2;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* 納経帳の下の入口 */
a.otakiage-gate {
  display: block;
  border-style: solid;
  border-color: var(--shu);
  color: inherit;
  text-decoration: none;
  transition: background-color 0.3s;
}

a.otakiage-gate:hover {
  background: var(--shu-soft);
}

a.otakiage-gate .otakiage-title {
  color: var(--shu);
}

/* ───────────── 狭い画面 ───────────── */

@media (max-width: 1100px) {
  .ri-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.9fr);
    grid-template-areas:
      'head head'
      'code stage'
      'code chat';
  }

  .ri-chat {
    position: static;
    margin-top: 32px;
  }
}

@media (max-width: 960px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding: 36px 16px 72px;
  }

  .top {
    padding: 18px 16px;
  }

  .stage-panel {
    position: static;
    padding-top: 0;
    margin-top: 40px;
  }

  .settings {
    right: 16px;
    width: calc(100vw - 32px);
    max-width: 360px;
  }

  .seal-page {
    flex-direction: column;
    gap: 28px;
    text-align: center;
  }

  .seal-actions {
    justify-content: center;
  }

  .ota-layout {
    padding: 36px 16px 72px;
  }

  .ri-layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      'head'
      'stage'
      'chat'
      'code';
    padding: 36px 16px 72px;
  }

  .ri-chat {
    position: static;
    margin: 32px 0;
  }

  .ota-cert {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .list-layout {
    padding: 36px 16px 72px;
  }

  .sutra-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (max-width: 560px) {
  :root {
    --code-size: 14px;
  }

  h1 {
    font-size: 36px;
  }

  .brand-en,
  .kbd {
    display: none;
  }

  .stats {
    gap: 18px;
  }

  .sutra-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .card-date {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

.ri-gate {
  margin-top: 16px;
}

.cert-ri-link {
  display: inline-block;
  margin-top: 16px;
  text-decoration: none;
}

/* ボタンの文字は折り返さない */
.btn-ink,
.btn-line,
.btn-shu {
  white-space: nowrap;
}

.ri-stage .run-bar .kbd {
  display: none;
}

.ri-stage .offer {
  flex-wrap: wrap;
}

/* ───────────── 提出（納経帳ファイル） ───────────── */

.submit-box {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 48px;
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.submit-form {
  display: grid;
  gap: 16px;
  align-content: start;
}

.submit-form .btn-ink {
  justify-self: start;
}

@media (max-width: 760px) {
  .submit-box {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
}

/* ───────────── 教員用：提出された納経帳 ───────────── */

.teacher-layout {
  position: relative;
  z-index: 1;
  max-width: 1320px;
  margin: 0 auto;
  padding: 52px 40px 96px;
}

.teacher-head {
  margin-bottom: 32px;
}

.drop {
  display: grid;
  place-items: center;
  gap: 6px;
  padding: 40px 24px;
  border: 1px dashed var(--ink-faint);
  background: var(--paper-sheet);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}

.drop input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.drop.is-over,
.drop:hover {
  border-color: var(--ink);
}

.drop-main {
  font-family: var(--font-mincho);
  font-size: 18px;
  letter-spacing: 0.2em;
}

.drop-sub {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.teacher-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin: 32px 0 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

.teacher-summary p {
  margin: 0;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--paper-sheet);
}

.teacher-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.teacher-table th,
.teacher-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  white-space: nowrap;
}

.teacher-table th {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}

.teacher-table tbody tr {
  cursor: pointer;
  transition: background-color 0.15s;
}

.teacher-table tbody tr:hover,
.teacher-table tbody tr.is-selected {
  background: var(--selection);
}

.teacher-table .num,
.teacher-table .mono {
  font-family: 'IBM Plex Mono', monospace;
  font-variant-numeric: tabular-nums;
}

.flag {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 8px;
  border: 1px solid var(--shu);
  color: var(--shu);
  font-size: 11px;
}

.flag.is-soft {
  border-color: var(--line);
  color: var(--ink-soft);
}

.ok {
  color: var(--ink-faint);
}

.teacher-detail {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.detail-name {
  margin: 6px 0;
  font-family: var(--font-mincho);
  font-size: 28px;
  letter-spacing: 0.12em;
}

.detail-table {
  margin-top: 16px;
}

.detail-table tbody tr {
  cursor: default;
}

.teacher-detail details {
  margin-top: 14px;
  font-size: 13px;
}

.teacher-detail summary {
  cursor: pointer;
  color: var(--ink-soft);
}

.teacher-detail pre {
  max-height: 360px;
  overflow: auto;
  padding: 14px 16px;
  background: var(--paper-sheet);
  border: 1px solid var(--line);
  font-family: var(--code-font);
  font-size: 12px;
  line-height: 1.7;
}

.detail-ri {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 40px;
  margin-top: 36px;
}

.detail-ri-title {
  margin: 0 0 6px;
  font-family: var(--font-mincho);
  font-size: 24px;
  letter-spacing: 0.1em;
}

.detail-texts dt {
  margin-top: 16px;
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--ink-faint);
}

.detail-texts dd {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.9;
  white-space: pre-wrap;
}

.detail-msg {
  margin: 8px 0;
  line-height: 1.8;
  white-space: pre-wrap;
}

.detail-msg b {
  display: inline-block;
  min-width: 3em;
  font-weight: 500;
  color: var(--ink-faint);
}

.teacher-notes {
  margin-top: 56px;
  max-width: 760px;
}

@media (max-width: 960px) {
  .teacher-layout {
    padding: 36px 16px 72px;
  }

  .detail-ri {
    grid-template-columns: minmax(0, 1fr);
  }
}