/* home.css — index.html 固有スタイル */

/* ═══════════════════════════════
   HERO
═══════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 24px;
  overflow: hidden;
  background: radial-gradient(120% 90% at 50% 0%, var(--washi) 0%, var(--kinari) 55%, var(--kinari-deep) 100%);
}

.hero__kanji {
  position: absolute;
  font-family: "Zen Old Mincho", serif;
  font-weight: 700;
  font-size: clamp(20rem, 52vw, 46rem);
  line-height: 1;
  color: var(--sumi);
  opacity: .04;
  user-select: none;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -48%);
  letter-spacing: -.04em;
  animation: floatk 14s ease-in-out infinite;
}

@keyframes floatk {
  50% { transform: translate(-50%, -51%); }
}

.enso {
  position: absolute;
  width: clamp(330px, 46vw, 560px);
  height: clamp(330px, 46vw, 560px);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-32deg);
}

.enso circle {
  fill: none;
  stroke: var(--shu);
  stroke-width: 3.2;
  stroke-linecap: round;
  stroke-dasharray: 1570;
  stroke-dashoffset: 1570;
  opacity: .82;
  animation: draw 2.6s var(--ease-soft) .3s forwards;
}

@keyframes draw {
  to { stroke-dashoffset: 150; }
}

.hero__inner {
  position: relative;
  z-index: 3;
  opacity: 0;
  animation: rise 1.4s var(--ease) 1.1s forwards;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(34px); }
  to   { opacity: 1; transform: none; }
}

.hero__mark {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(3rem, 7.5vw, 5.8rem);
  letter-spacing: clamp(.2em, 2.1vw, .5em);
  text-transform: uppercase;
  font-weight: 300;
  line-height: 1;
  text-indent: clamp(.2em, 2.1vw, .5em);
}

.hero__jp {
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(1.1rem, 2.2vw, 1.45rem);
  letter-spacing: 1em;
  margin-top: 30px;
  color: var(--sumi-soft);
  text-indent: 1em;
}

.hero__line {
  width: 1px;
  height: 64px;
  background: linear-gradient(var(--shu), transparent);
  margin: 38px auto 30px;
  transform-origin: top;
  animation: grow 1.2s var(--ease) 2s forwards;
  scale: 1 0;
}

@keyframes grow {
  to { scale: 1 1; }
}

.hero__tag {
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 500;
  letter-spacing: .18em;
  line-height: 1.8;
}

.hero__sub {
  margin-top: 22px;
  font-size: clamp(.8rem, 1.5vw, .92rem);
  letter-spacing: .22em;
  color: var(--sumi-soft);
}

.scrollcue {
  position: absolute;
  bottom: 64px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  writing-mode: vertical-rl;
  font-family: "Zen Old Mincho", serif;
  font-size: 11px;
  letter-spacing: .6em;
  color: var(--sumi-soft);
  display: flex;
  align-items: center;
  gap: 14px;
}

.scrollcue::after {
  content: "";
  width: 1px;
  height: 46px;
  background: var(--sumi-soft);
  animation: cue 2s var(--ease) infinite;
}

@keyframes cue {
  0%   { transform: scaleY(0); transform-origin: top; }
  40%  { transform: scaleY(1); transform-origin: top; }
  60%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ═══════════════════════════════
   概念
═══════════════════════════════ */
.concept { background: var(--washi); }

.concept__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(36px, 6vw, 80px);
  max-width: 1080px;
  margin: 0 auto;
  align-items: center;
}

@media (min-width: 900px) {
  .concept__grid { grid-template-columns: .85fr 1.15fr; }
}

.concept__big {
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(7rem, 18vw, 13rem);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.02em;
  color: var(--sumi);
}

.concept__big small {
  display: block;
  font-size: .1em;
  letter-spacing: .5em;
  color: var(--shu);
  margin-top: 24px;
  font-weight: 400;
}

.concept__body p {
  font-size: clamp(.95rem, 1.6vw, 1.06rem);
  letter-spacing: .06em;
  margin-bottom: 1.6em;
  color: var(--sumi-soft);
}

.concept__body .lead {
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  color: var(--sumi);
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: .1em;
  margin-bottom: 1.4em;
}

/* ═══════════════════════════════
   呼吸ガイド
═══════════════════════════════ */
.breath {
  background: var(--sumi);
  color: var(--kinari);
  text-align: center;
  overflow: hidden;
}

.breath__intro {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.breath .eyebrow          { color: var(--kin-soft); }
.breath .eyebrow::before  { background: var(--kin-soft); }
.breath .eyebrow b        { color: var(--kinari); }
.breath .h2               { color: var(--washi); }

.breath__stage {
  position: relative;
  width: min(78vw, 420px);
  height: min(78vw, 420px);
  margin: clamp(40px, 7vw, 80px) auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.breath__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(244,238,225,.16);
}

.breath__ring.r2 { inset: 14%; }

.breath__orb {
  width: 34%;
  height: 34%;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 34%, var(--shu), var(--shu-deep));
  box-shadow: 0 0 60px rgba(184,70,44,.5), 0 0 120px rgba(184,70,44,.25);
  animation: breathe 11s var(--ease-soft) infinite;
}

@keyframes breathe {
  0%   { transform: scale(1); }
  36%  { transform: scale(2.35); }
  45%  { transform: scale(2.35); }
  91%  { transform: scale(1); }
  100% { transform: scale(1); }
}

.breath__word {
  position: absolute;
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  letter-spacing: .4em;
  color: var(--washi);
  text-indent: .4em;
}

.breath__word span {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  white-space: nowrap;
}

.bw-in  { animation: bwin  11s linear infinite; }
.bw-out { animation: bwout 11s linear infinite; }

@keyframes bwin {
  0%,40%    { opacity: 1; }
  46%,95%   { opacity: 0; }
  100%      { opacity: 1; }
}

@keyframes bwout {
  0%,40%    { opacity: 0; }
  46%,95%   { opacity: 1; }
  96%,100%  { opacity: 0; }
}

.breath__note {
  margin-top: clamp(40px, 6vw, 70px);
  font-size: .82rem;
  letter-spacing: .24em;
  color: rgba(244,238,225,.6);
}

.breath__note b {
  color: var(--kin-soft);
  font-weight: 400;
}

/* ═══════════════════════════════
   思想と科学
═══════════════════════════════ */
.duo__head {
  max-width: 780px;
  margin: 0 auto clamp(50px, 7vw, 90px);
  text-align: center;
}

.duo__head .h2 { margin-bottom: 26px; }

.duo__head p {
  color: var(--sumi-soft);
  letter-spacing: .08em;
  font-size: clamp(.92rem, 1.5vw, 1rem);
}

.duo__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  max-width: 1080px;
  margin: 0 auto;
}

@media (min-width: 820px) {
  .duo__grid { grid-template-columns: 1fr 1fr; }
}

.duo__cell {
  background: var(--kinari);
  padding: clamp(34px, 5vw, 60px);
  position: relative;
  overflow: hidden;
  perspective: 900px;
  transition: background .6s var(--ease);
  outline: none;
}

/* ── バック（中身） ── */
.duo__back { position: relative; z-index: 1; }

.duo__num {
  font-family: "Cormorant Garamond", serif;
  font-style: italic;
  font-size: 1.1rem;
  color: var(--shu);
  letter-spacing: .1em;
}

.duo__t {
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
  margin: 18px 0 22px;
  letter-spacing: .12em;
}

.duo__t em {
  font-style: normal;
  font-family: "Cormorant Garamond", serif;
  display: block;
  font-size: .62em;
  letter-spacing: .3em;
  color: var(--sumi-soft);
  margin-top: 8px;
  font-weight: 300;
}

.duo__cell p  { color: var(--sumi-soft); font-size: .94rem; letter-spacing: .05em; }
.duo__cell ul { list-style: none; margin-top: 22px; display: flex; flex-wrap: wrap; gap: 10px; }

.duo__cell li {
  font-size: .72rem;
  letter-spacing: .16em;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 30px;
  color: var(--sumi-soft);
}

/* ── フロントカバー（PCのみ・ホバー前） ── */
.duo__front {
  position: absolute;
  inset: 0;
  background: var(--kinari);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2;
  transform-origin: top center;
  transition: transform .65s var(--ease);
  animation: duo-breathe 4.5s var(--ease-soft) infinite;
}

/* 予兆①: 呼吸する影（浮いている気配） */
@keyframes duo-breathe {
  0%, 100% { box-shadow: 0 2px 10px rgba(22,20,15,.04); }
  50%       { box-shadow: 0 10px 36px rgba(22,20,15,.13); }
}

/* 予兆②: 右上の折り返し角（朱の三角がゆっくり伸縮） */
.duo__front::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-color: transparent var(--shu) transparent transparent;
  animation: duo-fold 4.5s var(--ease-soft) infinite;
}

@keyframes duo-fold {
  0%, 100% { border-width: 0 20px 20px 0; opacity: .22; }
  50%       { border-width: 0 36px 36px 0; opacity: .48; }
}

/* 大きな漢数字 */
.duo__front-kanji {
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(9rem, 22vw, 18rem);
  font-weight: 700;
  color: var(--sumi);
  opacity: .1;
  line-height: 1;
  user-select: none;
  pointer-events: none;
}

/* "めくる" 縦書きヒント（右下） */
.duo__front-hint {
  position: absolute;
  bottom: clamp(22px, 3vw, 32px);
  right: clamp(22px, 3vw, 32px);
  writing-mode: vertical-rl;
  font-family: "Zen Old Mincho", serif;
  font-size: .58rem;
  letter-spacing: .55em;
  color: var(--shu);
  opacity: .5;
  user-select: none;
}

/* ── PC: ホバー・フォーカスでページめくり ── */
@media (hover: hover) {
  .duo__cell:hover,
  .duo__cell:focus-within {
    background: var(--washi);
  }

  .duo__cell:hover .duo__front,
  .duo__cell:focus-within .duo__front {
    transform: rotateX(-95deg);
    animation: none;
  }
}

/* ── タッチ / モバイル: フロントを非表示・中身を常時表示 ── */
@media (hover: none) {
  .duo__front { display: none; }
}

/* ── reduced-motion: 予兆アニメ停止・フォールバックはフェード ── */
@media (prefers-reduced-motion: reduce) {
  .duo__front {
    animation: none;
  }
  .duo__front::before {
    animation: none;
    border-width: 0 28px 28px 0;
    opacity: .35;
  }
}

@media (hover: hover) and (prefers-reduced-motion: reduce) {
  .duo__cell:hover .duo__front,
  .duo__cell:focus-within .duo__front {
    transform: none;
    opacity: 0;
    transition: opacity .35s;
  }
}

/* ═══════════════════════════════
   書籍
═══════════════════════════════ */
.books { background: var(--washi); }

.books__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto clamp(46px, 6vw, 76px);
}

.books__head .h2 { line-height: 1.4; }

.books__head p {
  max-width: 340px;
  color: var(--sumi-soft);
  font-size: .9rem;
  letter-spacing: .06em;
}

.books__list {
  max-width: 1100px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

.book {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(20px, 4vw, 50px);
  padding: clamp(26px, 4vw, 40px) clamp(6px, 2vw, 20px);
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  position: relative;
  transition: padding .5s var(--ease);
}

.book::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: 0;
  background: var(--shu);
  transition: width .6s var(--ease);
}

.book:hover::before        { width: 100%; }
.book:hover                { padding-left: clamp(14px, 3vw, 34px); }

.book__no {
  font-family: "Cormorant Garamond", serif;
  font-style: italic;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  color: var(--kin);
  min-width: 1.6em;
}

.book__main b {
  display: block;
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.5;
}

.book__main span {
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--sumi-soft);
}

.book__arrow {
  font-family: "Cormorant Garamond", serif;
  color: var(--shu);
  font-size: 1.4rem;
  transition: transform .5s var(--ease);
  opacity: 0;
}

.book:hover .book__arrow { transform: translateX(8px); opacity: 1; }

/* <a> タグとして使う場合のリセット */
a.book {
  text-decoration: none;
  color: inherit;
  display: grid;
}

@media (max-width: 640px) {
  .book              { grid-template-columns: auto 1fr; }
  .book__arrow       { display: none; }
}

/* ── concept 下層リンク ── */
.concept__more {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: "Zen Old Mincho", serif;
  font-size: .78rem;
  letter-spacing: .26em;
  color: var(--shu);
  text-decoration: none;
  margin-top: 28px;
  transition: gap .4s var(--ease);
}

.concept__more:hover { gap: 14px; }

/* ── books 下層リンク ── */
.books__footer {
  display: flex;
  gap: clamp(16px, 3vw, 28px);
  margin-top: clamp(36px, 5vw, 52px);
  flex-wrap: wrap;
  align-items: center;
}

.books__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: "Zen Old Mincho", serif;
  font-size: .78rem;
  letter-spacing: .26em;
  color: var(--sumi);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 4px;
  transition: color .4s var(--ease), border-color .4s var(--ease), gap .4s var(--ease);
}

.books__link:hover {
  color: var(--shu);
  border-color: var(--shu);
  gap: 13px;
}

/* ═══════════════════════════════
   結び（closing）
═══════════════════════════════ */
.closing {
  text-align: center;
  background: var(--kinari);
  position: relative;
  overflow: hidden;
}

.closing__seal {
  width: 104px;
  height: 104px;
  margin: 0 auto 50px;
  border-radius: 14px;
  background: var(--shu);
  color: var(--washi);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Zen Old Mincho", serif;
  font-size: 54px;
  font-weight: 700;
  box-shadow: 0 10px 40px rgba(184,70,44,.3);
  transform: rotate(-6deg) scale(0);
  border: 3px solid var(--shu-deep);
}

.closing__seal.stamp {
  animation: stamp .6s var(--ease) forwards;
}

@keyframes stamp {
  0%   { transform: rotate(-22deg) scale(1.7); opacity: 0; }
  60%  { opacity: 1; }
  100% { transform: rotate(-6deg) scale(1); opacity: 1; }
}

.closing__t {
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(2rem, 6vw, 3.8rem);
  font-weight: 600;
  letter-spacing: .14em;
  line-height: 1.7;
}

.closing__sub {
  margin-top: 30px;
  color: var(--sumi-soft);
  letter-spacing: .2em;
  font-size: clamp(.85rem, 1.5vw, .95rem);
}

/* ═══════════════════════════════
   ホーム モバイル補正
═══════════════════════════════ */
@media (max-width: 680px) {
  .hero__mark {
    font-size: clamp(1.4rem, 5.5vw, 3rem);
    letter-spacing: .2em;
    text-indent: .2em;
  }
  .hero__jp {
    letter-spacing: .45em;
    text-indent: .45em;
    margin-top: 18px;
  }
  .hero__line {
    height: 40px;
    margin: 22px auto 18px;
  }
  .hero__tag {
    font-size: clamp(1.1rem, 3vw, 2rem);
    letter-spacing: .1em;
  }
  .hero__sub {
    letter-spacing: .12em;
    margin-top: 14px;
  }
}