/* ヒーロー、版面、章扉、全幅見開き、各章の基本配置を担うCSS。 */
/* 横並びと比率で作る読み幅だけにgrid/flexを使う。 */
.book-page {
  position: relative;
}

.book-page::before,
.book-page::after {
  color: var(--ink);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  line-height: 1;
  pointer-events: none;
  position: absolute;
  z-index: 8;
}

.book-page::before {
  content: attr(data-running-title);
  inset-block-start: clamp(18px, 2.4vw, 30px);
  inset-inline-start: clamp(20px, 4vw, 44px);
}

.book-page::after {
  content: attr(data-folio);
  inset-block-end: clamp(18px, 2.4vw, 30px);
  inset-inline-end: clamp(20px, 4vw, 44px);
  letter-spacing: 0.12em;
}

html.has-folio-turner .book-page::after {
  opacity: 0;
}

/* 新旧2枚の数字を同じ座標へ重ね、ノンブルだけをクロスフェードするためのgrid。 */
.folio-turner {
  color: var(--text);
  display: grid;
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
  inset-block-end: max(clamp(18px, 2.4vw, 30px), env(safe-area-inset-bottom));
  inset-inline-end: clamp(20px, 4vw, 44px);
  letter-spacing: 0.12em;
  line-height: 1;
  pointer-events: none;
  position: fixed;
  z-index: 11;
}

.folio-turner__number {
  grid-area: 1 / 1;
  opacity: 0;
}

.folio-turner__number.is-current {
  opacity: 1;
}

.hero {
  overflow: hidden;
  position: relative;
}

.hero__media,
.hero__veil {
  inset: 0;
  position: absolute;
}

.hero__media {
  z-index: 0;
}

/* 画像座標%の三角形で、画像内に実在する壁の自然光だけを覆う。 */
.hero__window-light {
  background: rgba(250, 242, 218, 0.14);
  clip-path: polygon(34.570% 2.734%, 69.336% 51.953%, 30.729% 51.953%);
  height: 100%;
  left: 0;
  mix-blend-mode: soft-light;
  pointer-events: none;
  position: absolute;
  top: 0;
  width: 100%;
  z-index: 1;
}

/* ヒーローの内在画像を、本文が作る領域全体へ敷くための例外指定。 */
.hero__image {
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.hero__veil {
  background: var(--paper-wash);
  z-index: 2;
}

.hero__content {
  align-items: end;
  display: grid;
  gap: clamp(20px, 5vw, 72px);
  grid-template-columns: auto 1fr;
  padding-block: clamp(96px, 15vw, 190px) clamp(64px, 9vw, 118px);
  position: relative;
  z-index: 3;
}

.hero__identity {
  align-items: flex-start;
  display: flex;
  gap: 0.85rem;
}

.hero__title {
  text-orientation: upright;
  writing-mode: vertical-rl;
}

.hero__name,
.hero__role,
.hero__message {
  display: block;
}

.hero__role {
  margin-inline-start: 0.8rem;
}

.hero__catch {
  text-align: end;
}

.hero__message {
  justify-self: end;
}

.section,
.works-heading {
  background: var(--paper);
  color: var(--ink);
  padding-block: clamp(104px, 14vw, 184px);
}

.section-heading {
  align-items: center;
  display: flex;
  gap: clamp(14px, 2.5vw, 28px);
  margin-block-end: clamp(36px, 6vw, 72px);
}

.chapter-mark {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
}

.chapter-frame,
.chapter-number {
  grid-area: 1 / 1;
}

.chapter-number {
  writing-mode: vertical-rl;
}

.chapter-rule {
  flex: 1 1 auto;
}

.works-heading {
  border-block-start: 1px solid var(--rule);
  padding-block-end: clamp(52px, 7vw, 88px);
}

.works-lead {
  letter-spacing: 0.08em;
}

.table-of-contents__heading {
  margin-block-end: clamp(44px, 7vw, 84px);
}

.chapter-title {
  background: var(--paper);
  color: var(--ink);
  padding-block: clamp(144px, 19vw, 260px);
}

.chapter-title--evening {
  background: var(--paper-deep);
}

.chapter-title__inner {
  align-items: center;
  display: grid;
  gap: clamp(22px, 4vw, 58px);
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
}

.chapter-title__number {
  justify-self: end;
  text-orientation: upright;
  writing-mode: vertical-rl;
}

.chapter-title__copy {
  text-align: center;
}

.chapter-title__copy h3 {
  margin-block-start: 0.8rem;
  text-wrap: balance;
}

.seal--chapter {
  justify-self: start;
}

.book-spread {
  background: var(--paper);
  border-block-start: 1px solid var(--rule);
  color: var(--ink);
}

.book-spread__link,
.book-spread__visual,
.book-spread__visual picture,
.book-spread__reveal,
.book-spread__parallax,
.book-spread__depth,
.book-spread__copy {
  display: block;
}

.book-spread__link {
  position: relative;
  text-decoration: none;
}

/* 見開きの画像面を上下の紙へ溶かす、ブリーフ指定の静的境界。 */
.book-spread__link::before,
.book-spread__link::after {
  content: "";
  inset-inline: 0;
  padding-block: clamp(28px, 5vw, 66px);
  pointer-events: none;
  position: absolute;
  z-index: 3;
}

.book-spread__link::before {
  background: linear-gradient(to bottom, var(--paper), rgba(243, 239, 230, 0));
  inset-block-start: 0;
}

.book-spread__link::after {
  background: linear-gradient(to top, var(--paper), rgba(243, 239, 230, 0));
  inset-block-end: 0;
}

.book-spread__visual {
  background: var(--paper-deep);
  overflow: hidden;
  perspective: 1400px;
  perspective-origin: 100% 50%;
}

.book-spread__depth {
  position: relative;
  transform-origin: center;
}

/* 装画の上にだけ置く、静止した極薄の和紙粒。小さな反復粒なので大面積再描画を起こさない。 */
.book-spread__depth::after {
  background-image:
    radial-gradient(circle, rgba(138, 115, 87, 0.18) 0 0.45px, transparent 0.7px),
    radial-gradient(circle, rgba(243, 239, 230, 0.2) 0 0.4px, transparent 0.65px);
  background-position: 0 0, 11px 8px;
  background-size: 23px 17px, 31px 29px;
  content: "";
  inset: 0;
  mix-blend-mode: soft-light;
  opacity: 0.18;
  pointer-events: none;
  position: absolute;
  z-index: 1;
}

/* 文芸装画の2:3内在比率を保ち、見開きの画像面へ沿わせる。 */
.book-spread__visual img {
  aspect-ratio: 2 / 3;
  object-fit: cover;
  width: 100%;
}

.book-spread__copy {
  align-self: center;
  padding: clamp(70px, 10vw, 136px) clamp(24px, 7vw, 104px);
}

.book-spread__summary {
  display: block;
  margin-block-start: 1.35rem;
}

.book-fragment {
  border-block-start: 1px solid currentColor;
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: minmax(0, 0.24fr) minmax(0, 1fr) minmax(0, 0.24fr);
  margin: 0;
  padding-block: clamp(64px, 9vw, 124px);
  text-align: center;
}

.book-fragment [data-fragment-line] {
  grid-column: 2;
}

.night-panorama {
  overflow: hidden;
  position: relative;
}

/* 白フェードを使わず、紙から夜へ落とす短い夕暮れ色の境界帯。 */
.night-threshold {
  background: #4d4650;
  border-block: 1px solid rgba(138, 115, 87, 0.72);
  display: block;
  padding-block: clamp(7px, 1vw, 12px);
}

/* 夜の帯のワイド画像を全幅へ追従させる内在画像の例外指定。 */
.night-panorama img,
.profile-image img {
  width: 100%;
}

.book-spread--night,
.book-spread--night .book-spread__link {
  background: var(--ink);
  color: var(--paper);
}

.book-spread--night .book-spread__link {
  border-block-start: 1px solid rgba(243, 239, 230, 0.2);
}

.book-spread--night .book-spread__link::before {
  content: none;
}

.book-spread--night .book-spread__link::after {
  content: none;
}

.book-spread--night::before {
  color: var(--paper);
}

.book-spread--night::after {
  color: var(--paper);
}

.book-spread--night .book-spread__visual {
  background: #151e30;
}

.works-note-band {
  background: var(--paper);
  border-block-start: 1px solid var(--rule);
  color: var(--ink);
}

.works-note {
  margin-block-start: 0;
  padding-block: 1.5rem clamp(72px, 9vw, 112px);
}

.section--profile {
  padding-block-end: clamp(96px, 13vw, 170px);
}

.profile-image {
  overflow: hidden;
}

.profile-layout {
  padding-block-start: clamp(48px, 7vw, 88px);
}

.profile-copy > p,
.request-layout p,
.letter-card__body {
  letter-spacing: 0.035em;
}

.profile-layout .seal {
  margin-block-start: 2rem;
}

.bookmark-section {
  background: var(--paper-deep);
  border-block: 1px solid var(--rule);
}

.bookmark-layout {
  align-items: center;
}

.bookmark-ribbon {
  /* 既存の臙脂だけを濃淡にした静的な布目。 */
  background: repeating-linear-gradient(90deg, var(--accent) 0 2px, rgba(122, 46, 46, 0.88) 2px 3px);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 86%, 0 100%);
  display: block;
  margin-block-end: 2rem;
  /* 栞そのものを表す装飾なので、形を保つ固定寸法が必要。 */
  height: 154px;
  width: 42px;
}

.bookmark-section h2,
.bookmark-section p + p {
  margin-block-start: 1rem;
}

.request-list {
  margin-block-start: 2.5rem;
}

.contact {
  overflow: hidden;
  position: relative;
}

.contact__media,
.contact__veil {
  inset: 0;
  position: absolute;
}

.contact__media {
  z-index: 0;
}

/* 背景写真をセクション全体へ敷く内在画像の例外指定。 */
.contact__media img {
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.contact__veil {
  background: rgba(243, 239, 230, 0.84);
  z-index: 1;
}

.contact__content {
  position: relative;
  z-index: 2;
}

.closing-line {
  border-block-start: 1px solid var(--rule);
  margin-block-start: clamp(64px, 9vw, 110px);
  padding-block-start: 2.5rem;
}

.site-footer {
  background: var(--paper);
  border-block-start: 1px solid var(--rule);
  color: var(--ink);
  padding-block: 2rem;
}

.footer-inner p + p {
  margin-block-start: 0.3rem;
}