/* =====================================================================
   渡岸寺観音堂（向源寺）公式サイト — style.css
   DESIGN_RULES.md に基づく。色を使わず、余白と字送りで格式をつくる。
   ===================================================================== */

/* ---------- 1. トークン ---------- */
:root {
  --c-sumi: #111111;
  --c-kinari: #F7F5F2;
  --c-white: #FFFFFF;
  --c-text: #222222;
  --c-text-sub: #777777;
  --c-text-rev: #FFFFFF;
  --c-rule: #DDDDDD;
  --c-rule-dark: #444444;
  --c-accent: #8C6A3F;

  --font-jp: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;

  --w-text: 900px;
  --w-wide: 1200px;
  --gutter: 24px;

  --sp-section: 140px;
  --sp-block: 80px;
  --sp-item: 32px;
  --sp-tight: 24px;

  --ease: cubic-bezier(.14, .52, .41, .99);
  --header-h: 96px;
  --bar-h: 56px;
}

@media (max-width: 768px) {
  :root {
    --sp-section: 72px;
    --sp-block: 48px;
    --sp-item: 24px;
    --sp-tight: 20px;
    --header-h: 72px;
  }
}

/* ---------- 2. ベース ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--c-kinari);
  color: var(--c-text);
  font-family: var(--font-jp);
  font-weight: 300;
  font-size: 17px;
  line-height: 2;
  letter-spacing: .05em;
  font-feature-settings: "palt" 0;
  -webkit-font-smoothing: antialiased;
}

@media (max-width: 768px) {
  body { font-size: 16px; padding-bottom: var(--bar-h); }
}

h1, h2, h3, h4, h5, h6, strong, th, b {
  font-weight: 300;
}

h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.8;
}

p { margin: 0 0 1.6em; }
p:last-child { margin-bottom: 0; }

a {
  color: inherit;
  text-decoration: none;
  transition: opacity .3s var(--ease), color .3s var(--ease), background-color .3s var(--ease), border-color .3s var(--ease);
}
a:hover { opacity: .7; }

img {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol { margin: 0; padding: 0; list-style: none; }

figure { margin: 0; }

figcaption, .caption {
  font-size: 13px;
  line-height: 1.9;
  color: var(--c-text-sub);
  text-align: center;
  margin-top: 14px;
  letter-spacing: .05em;
}

:focus-visible {
  outline: 1px solid var(--c-accent);
  outline-offset: 4px;
}

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

/* ---------- 3. タイポグラフィ ---------- */
.t-page {            /* ページタイトル h1 */
  font-size: 28px;
  letter-spacing: .2em;
  line-height: 2;
  text-align: center;
}
.t-section {         /* セクション見出し h2 */
  font-size: 24px;
  letter-spacing: .2em;
  line-height: 1.8;
  text-align: center;
}
.t-sub {             /* 小見出し h3 */
  font-size: 20px;
  letter-spacing: .16em;
  line-height: 1.8;
}
.t-name {            /* 仏像名など h4 */
  font-size: 18px;
  letter-spacing: .1em;
}
.t-en {              /* 英字サブタイトル */
  display: block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--c-text-sub);
  line-height: 1.6;
  margin-top: 10px;
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .t-page { font-size: 22px; }
  .t-section { font-size: 20px; }
  .t-sub { font-size: 18px; }
  .t-name { font-size: 17px; }
}

/* 見出し下の下がり罫（東寺 h3::after の手法） */
.t-section::after {
  content: "";
  display: block;
  width: 1px;
  height: 48px;
  background: var(--c-rule);
  margin: 28px auto 0;
}
.dark .t-section::after { background: var(--c-rule-dark); }

.lead {
  text-align: center;
  font-size: 18px;
  line-height: 2.2;
}
@media (max-width: 768px) { .lead { font-size: 16px; text-align: left; } }

.vertical {
  writing-mode: vertical-rl;
  letter-spacing: .2em;
  line-height: 2.4;
  margin: 0 auto;
  padding: 1em .9em .7em .8em;
  border-left: 1px solid var(--c-rule);
  border-right: 1px solid var(--c-rule);
  font-size: 18px;
  height: 22em;
  max-height: 70vh;
}

ruby rt { font-size: .5em; letter-spacing: 0; }

/* ---------- 4. レイアウト ---------- */
.container {
  width: 100%;
  max-width: calc(var(--w-text) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.container--wide {
  max-width: calc(var(--w-wide) + var(--gutter) * 2);
}
.container--narrow {
  max-width: calc(720px + var(--gutter) * 2);
}

.section { padding: var(--sp-section) 0; }
.section--tight { padding: var(--sp-block) 0; }
.section:not(.dark) + .section:not(.dark) { padding-top: 0; }

.block { margin-top: var(--sp-block); }
.item { margin-top: var(--sp-item); }
.tight { margin-top: var(--sp-tight); }

.dark {
  background: var(--c-sumi);
  color: var(--c-text-rev);
}
.dark .t-en, .dark figcaption, .dark .caption { color: #9a9a9a; }

.rule { border: 0; border-top: 1px solid var(--c-rule); margin: 0; }
.dark .rule { border-color: var(--c-rule-dark); }

.center { text-align: center; }

/* 2カラム（写真＋本文） */
.feature {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: 64px;
  align-items: center;
}
.feature--rev { grid-template-columns: 6fr 5fr; }
.feature--rev .feature__media { order: 2; }
.feature__body { min-width: 0; }
@media (max-width: 900px) {
  .feature, .feature--rev { grid-template-columns: 1fr; gap: 32px; }
  .feature--rev .feature__media { order: 0; }
}

/* ---------- 5. ヘッダー ---------- */
.header {
  position: absolute;
  top: 0; left: 0; right: 0;
  z-index: 50;
  height: var(--header-h);
  color: var(--c-text-rev);
  display: flex;
  align-items: center;
  padding: 0 40px;
}
@media (max-width: 768px) { .header { padding: 0 var(--gutter); } }

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  letter-spacing: .18em;
  white-space: nowrap;
}
.logo__main { font-size: 20px; }
.logo__sub  { font-size: 10px; letter-spacing: .3em; color: #b5b5b5; margin-top: 4px; }
@media (max-width: 768px) { .logo__main { font-size: 17px; } }

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav__list {
  display: flex;
  gap: 22px;
  font-size: 13px;
  letter-spacing: .12em;
}
.nav__list a { padding: 8px 0; border-bottom: 1px solid transparent; white-space: nowrap; }
@media (min-width: 1440px) { .nav__list { gap: 28px; font-size: 14px; } }
@media (max-width: 1439px) and (min-width: 901px) { .nav__tel { display: none; } }
.nav__list a:hover { opacity: 1; border-bottom-color: var(--c-text-rev); }
.nav__list a[aria-current="page"] { border-bottom-color: var(--c-text-rev); }

.nav__util {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 12px;
  letter-spacing: .12em;
  padding-left: 28px;
  border-left: 1px solid var(--c-rule-dark);
}
.nav__util a { white-space: nowrap; }
.nav__lang { letter-spacing: .2em; }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  font-size: 12px;
  letter-spacing: .2em;
  padding: 12px 0 12px 12px;
  cursor: pointer;
  white-space: nowrap;
  flex: none;
}
@media (max-width: 360px) { .nav-toggle { font-size: 0; } .nav-toggle span { margin-left: 0; } }
.nav-toggle span {
  display: inline-block;
  vertical-align: middle;
  width: 22px; height: 1px;
  background: currentColor;
  position: relative;
  margin-left: 12px;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 22px; height: 1px; background: currentColor;
}
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }

@media (max-width: 1080px) {
  .nav__list { gap: 14px; font-size: 12px; letter-spacing: .08em; }
  .nav__util { gap: 14px; padding-left: 16px; }
  .header { padding: 0 24px; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; align-items: center; }
  .nav {
    position: fixed;
    inset: 0;
    background: var(--c-sumi);
    flex-direction: column;
    justify-content: center;
    gap: 40px;
    transform: translateY(-100%);
    opacity: 0;
    transition: transform .5s var(--ease), opacity .5s var(--ease);
    z-index: 60;
  }
  .nav.is-open { transform: none; opacity: 1; }
  .nav__list { flex-direction: column; align-items: center; gap: 20px; font-size: 17px; letter-spacing: .2em; }
  .nav__util { border-left: 0; padding-left: 0; flex-direction: column; gap: 16px; font-size: 14px; }
  .nav__close {
    position: absolute; top: 24px; right: var(--gutter);
    background: none; border: 0; color: inherit; font: inherit;
    font-size: 12px; letter-spacing: .2em; cursor: pointer; padding: 12px 0;
  }
}
@media (min-width: 901px) { .nav__close { display: none; } }

/* ---------- 6. ヒーロー（トップ：黒ステージ） ---------- */
.hero {
  min-height: 100svh;
  background: var(--c-sumi);
  color: var(--c-text-rev);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-h) + 24px) var(--gutter) 72px;
  text-align: center;
}
.hero__img {
  width: auto;
  max-width: 100%;
  max-height: 62svh;
  opacity: 0;
  transition: opacity 3s linear;
}
.hero__img.is-loaded { opacity: 1; }
.hero__caption {
  margin-top: 36px;
  font-size: 13px;
  letter-spacing: .3em;
  color: #9a9a9a;
}
.hero__title {
  margin-top: 12px;
  font-size: 20px;
  letter-spacing: .3em;
}
@media (max-width: 768px) {
  .hero__img { max-height: 56svh; }
  .hero__title { font-size: 17px; letter-spacing: .2em; }
  .hero__caption { letter-spacing: .2em; }
}

/* ---------- 7. ページタイトル帯（下層） ---------- */
.page-head {
  background: var(--c-sumi);
  color: var(--c-text-rev);
  padding: calc(var(--header-h) + 72px) var(--gutter) 88px;
  text-align: center;
}
.page-head .t-en { color: #9a9a9a; }
.page-head::after {
  content: "";
  display: block;
  width: 120px; height: 1px;
  background: #666;
  margin: 36px auto 0;
}
@media (max-width: 768px) {
  .page-head { padding: calc(var(--header-h) + 40px) var(--gutter) 56px; }
}

/* 国宝ページのヒーロー（背面像） */
.kannon-hero {
  background: var(--c-sumi);
  color: var(--c-text-rev);
  padding: 0 var(--gutter) 96px;
  text-align: center;
}
.kannon-hero__img {
  margin: 0 auto;
  width: auto;
  max-width: 100%;
  max-height: 84svh;
}
.kannon-hero__note {
  max-width: 600px;
  margin: 56px auto 0;
  font-size: 17px;
  line-height: 2.4;
  letter-spacing: .1em;
}
.kannon-hero__note em { font-style: normal; letter-spacing: .2em; }
@media (max-width: 768px) {
  .kannon-hero { padding-bottom: 64px; }
  .kannon-hero__img { max-height: 70svh; }
  .kannon-hero__note { margin-top: 36px; font-size: 16px; }
}

/* ---------- 8. コンポーネント ---------- */

/* 枠線ボタン */
.box {
  display: inline-block;
  padding: 16px 44px;
  border: 1px solid var(--c-rule);
  color: var(--c-text);
  letter-spacing: .2em;
  font-size: 14px;
  line-height: 1.6;
  text-align: center;
}
.box:hover {
  opacity: 1;
  background: var(--c-sumi);
  border-color: var(--c-sumi);
  color: var(--c-text-rev);
}
.dark .box { border-color: #666; color: var(--c-text-rev); }
.dark .box:hover { background: var(--c-kinari); border-color: var(--c-kinari); color: var(--c-text); }
.box--sm { padding: 12px 28px; font-size: 13px; }

/* 格付けバッジ */
.badge {
  display: inline-block;
  border: 1px solid var(--c-accent);
  color: var(--c-accent);
  font-size: 12px;
  letter-spacing: .18em;
  line-height: 1;
  padding: 6px 12px 5px;
  vertical-align: middle;
  margin-right: 12px;
}
.dark .badge { border-color: #b09468; color: #b09468; }

/* 拝観情報 早見帯 */
.quick {
  border-top: 1px solid var(--c-rule);
  border-bottom: 1px solid var(--c-rule);
}
.quick__list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
}
.quick__item {
  padding: 28px 12px;
  text-align: center;
  border-left: 1px solid var(--c-rule);
}
.quick__item:first-child { border-left: 0; }
.quick__label {
  display: block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--c-text-sub);
  line-height: 1.6;
}
.quick__value {
  display: block;
  font-size: 18px;
  letter-spacing: .1em;
  margin-top: 8px;
  line-height: 1.6;
}
.quick__more {
  text-align: center;
  padding: 28px var(--gutter) 32px;
  border-top: 1px solid var(--c-rule);
}
@media (max-width: 768px) {
  .quick__list { grid-template-columns: 1fr 1fr; }
  .quick__item { padding: 20px 8px; border-top: 1px solid var(--c-rule); }
  .quick__item:nth-child(-n+2) { border-top: 0; }
  .quick__item:nth-child(odd) { border-left: 0; }
  .quick__item:last-child:nth-child(odd) { grid-column: 1 / -1; }
  .quick__value { font-size: 16px; }
}

/* 定義リスト（拝観情報） */
.info { margin: 0; }
.info__row {
  display: grid;
  grid-template-columns: 9em 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--c-rule);
}
.info__row:first-child { border-top: 1px solid var(--c-rule); }
.info dt { color: var(--c-text-sub); letter-spacing: .1em; }
.info dd { margin: 0; }
.info dd small { display: block; font-size: 13px; color: var(--c-text-sub); line-height: 1.9; }
@media (max-width: 768px) {
  .info__row { grid-template-columns: 1fr; gap: 4px; padding: 16px 0; }
}

/* 罫線リスト（お知らせ） */
.news-list { border-top: 1px solid var(--c-rule); }
.news-item {
  display: flex;
  gap: 32px;
  padding: 22px 0;
  border-bottom: 1px solid var(--c-rule);
}
.news-item time {
  flex: 0 0 9em;
  color: var(--c-text-sub);
  font-size: 14px;
  letter-spacing: .1em;
}
.dark .news-list, .dark .news-item { border-color: var(--c-rule-dark); }
@media (max-width: 768px) {
  .news-item { flex-direction: column; gap: 4px; }
}

/* カード列（諸仏の導線・四季） */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.cards--4 { grid-template-columns: repeat(4, 1fr); gap: 24px; }
.cards--2 { grid-template-columns: repeat(2, 1fr); }
.card__img { aspect-ratio: 2 / 3; object-fit: cover; width: 100%; background: var(--c-sumi); }
.card__img--landscape { aspect-ratio: 3 / 2; }
.card__img--square { aspect-ratio: 1 / 1; }
.card__img--contain { object-fit: contain; }
.card__img--light { object-fit: cover; background: #e9e6e1; }
.card__title { margin-top: 18px; font-size: 16px; letter-spacing: .12em; text-align: center; line-height: 1.8; }
@media (max-width: 900px) {
  .cards, .cards--4 { grid-template-columns: repeat(2, 1fr); gap: 24px; }
}
@media (max-width: 480px) {
  .cards--scroll {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 16px;
    margin: 0 calc(var(--gutter) * -1);
    padding: 0 var(--gutter);
    -webkit-overflow-scrolling: touch;
  }
  .cards--scroll > * { flex: 0 0 68%; scroll-snap-align: start; }
}

/* 七相グリッド */
.faces {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 24px;
}
.faces__img { aspect-ratio: 1 / 1; object-fit: cover; width: 100%; background: var(--c-sumi); }
.faces__name { margin-top: 16px; font-size: 17px; letter-spacing: .15em; text-align: center; }
.faces__desc { font-size: 14px; color: var(--c-text-sub); text-align: center; line-height: 1.9; margin-top: 4px; }
@media (max-width: 768px) { .faces { grid-template-columns: repeat(2, 1fr); gap: 24px 16px; } }

/* 順路リスト */
.route { counter-reset: r; }
.route li {
  counter-increment: r;
  display: grid;
  grid-template-columns: 3em 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-rule);
}
.route li::before {
  content: counter(r, cjk-ideographic);
  color: var(--c-text-sub);
  letter-spacing: .1em;
}
.route li:first-child { border-top: 1px solid var(--c-rule); }

/* 年表 */
.timeline { width: 100%; border-collapse: collapse; }
.timeline th, .timeline td { padding: 16px 0; border-bottom: 1px solid var(--c-rule); vertical-align: top; text-align: left; }
.timeline th { width: 12em; color: var(--c-text-sub); letter-spacing: .1em; font-size: 15px; }
.timeline tr:first-child th, .timeline tr:first-child td { border-top: 1px solid var(--c-rule); }
@media (max-width: 600px) {
  .timeline th, .timeline td { display: block; width: auto; padding: 0; border: 0; }
  .timeline tr { display: block; padding: 16px 0; border-bottom: 1px solid var(--c-rule); }
  .timeline tr:first-child { border-top: 1px solid var(--c-rule); }
  .timeline td { margin-top: 4px; }
}

/* 地図 */
.map {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--c-rule);
  background: var(--c-white);
}
.map iframe { width: 100%; height: 100%; border: 0; display: block; }

/* リンク集 */
.links li { border-bottom: 1px solid var(--c-rule); }
.links li:first-child { border-top: 1px solid var(--c-rule); }
.links a { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding: 18px 0; }
.links a::after { content: "→"; color: var(--c-text-sub); flex: none; }
.links small { color: var(--c-text-sub); font-size: 13px; }

/* 章見出し（歴史） */
.chapter { margin-top: var(--sp-section); }
.chapter:first-of-type { margin-top: 0; }
.chapter__num {
  display: block;
  font-size: 13px;
  letter-spacing: .3em;
  color: var(--c-text-sub);
  text-align: center;
}
.chapter__title { text-align: center; margin-top: 8px; }
.chapter__body { margin-top: var(--sp-item); }

/* 仏像セクション */
.statue { padding: var(--sp-section) 0; border-top: 1px solid var(--c-rule); }
.statue:first-of-type { border-top: 0; }
.statue__img { width: 100%; aspect-ratio: 2 / 3; object-fit: contain; background: var(--c-sumi); }
.statue__img--landscape { aspect-ratio: 3 / 2; background: var(--c-kinari); }
.statue__img--light { object-fit: cover; background: #e9e6e1; }
.statue__spec {
  margin-top: 12px;
  font-size: 13px;
  color: var(--c-text-sub);
  letter-spacing: .08em;
  line-height: 1.9;
}
.statue__pair { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

/* プレースホルダー印（試作のみ） */
[data-placeholder] { position: relative; }

/* ---------- 9. SP固定バー ---------- */
.bar {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  height: var(--bar-h);
  background: var(--c-sumi);
  color: var(--c-text-rev);
  z-index: 40;
  grid-template-columns: repeat(3, 1fr);
  font-size: 12px;
  letter-spacing: .15em;
}
.bar a {
  display: flex;
  align-items: center;
  justify-content: center;
  border-left: 1px solid var(--c-rule-dark);
}
.bar a:first-child { border-left: 0; }
@media (max-width: 768px) { .bar { display: grid; } }

/* ---------- 10. フッター ---------- */
.footer__mark {
  padding: 120px var(--gutter);
  text-align: center;
  background: var(--c-kinari);
}
.footer__mark .logo { display: inline-flex; color: var(--c-text); }
.footer__mark .logo__sub { color: var(--c-text-sub); }
.footer__mark::after {
  content: "";
  display: block;
  width: 1px; height: 64px;
  background: var(--c-rule);
  margin: 40px auto 0;
}
.footer {
  background: #141414;
  color: var(--c-text-rev);
  padding: 72px var(--gutter) 40px;
  font-size: 14px;
  letter-spacing: .08em;
}
.footer__grid {
  max-width: var(--w-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 48px;
}
.footer h2 {
  font-size: 12px;
  letter-spacing: .3em;
  color: #9a9a9a;
  margin-bottom: 20px;
}
.footer li { margin-bottom: 10px; }
.footer address { font-style: normal; line-height: 2.1; }
.footer__copy {
  max-width: var(--w-wide);
  margin: 64px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--c-rule-dark);
  font-size: 12px;
  color: #9a9a9a;
  letter-spacing: .15em;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
@media (max-width: 768px) {
  .footer__mark { padding: 72px var(--gutter); }
  .footer__grid { grid-template-columns: 1fr; gap: 36px; }
}

/* ---------- 11. モーション ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1.2s var(--ease), transform 1.2s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }

.t-section { transition: letter-spacing 1.6s var(--ease); }
.t-section.is-in { letter-spacing: .3em; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero__img { opacity: 1; transition: none; }
  .t-section { transition: none; }
  .nav { transition: none; }
}