@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;600;700&family=Noto+Serif+JP:wght@400;500;600;700&display=swap');

:root {
  color-scheme: light dark;
  --bg: #f4f0e7;
  --bg-soft: #ebe4d7;
  --surface: rgba(255,255,255,.58);
  --surface-strong: #fffdf8;
  --ink: #171717;
  --muted: #6f6a62;
  --rule: rgba(23,23,23,.16);
  --accent: #a33a2f;
  --accent-ink: #7c241d;
  --shadow: 0 22px 65px rgba(53,42,29,.12);
  --reader-size: 1.12rem;
  --reader-leading: 1.82;
  --reader-family: 'Noto Serif JP', 'Noto Serif CJK JP', Georgia, serif;
  --ui-family: 'Noto Sans JP', 'Noto Sans CJK JP', system-ui, sans-serif;
  --serif-family: 'Noto Serif JP', 'Noto Serif CJK JP', Georgia, serif;
  --max-page: 1180px;
  --max-reader: 720px;
}

html[data-theme='dark'] {
  --bg: #111313;
  --bg-soft: #191c1c;
  --surface: rgba(255,255,255,.045);
  --surface-strong: #191b1b;
  --ink: #ece8df;
  --muted: #aaa49a;
  --rule: rgba(236,232,223,.16);
  --accent: #df7769;
  --accent-ink: #f09a8f;
  --shadow: 0 24px 70px rgba(0,0,0,.34);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 0%, color-mix(in srgb, var(--accent) 7%, transparent), transparent 30rem),
    var(--bg);
  color: var(--ink);
  font-family: var(--ui-family);
  line-height: 1.55;
  transition: background-color .18s ease, color .18s ease;
}
body.reader-font-sans { --reader-family: 'Noto Sans JP', 'Noto Sans CJK JP', system-ui, sans-serif; }
a { color: inherit; }
button, input { font: inherit; }
button { color: inherit; }

.skip-link { position:absolute; left:-999px; top:0; background:var(--ink); color:var(--bg); padding:.8rem 1rem; z-index:20; }
.skip-link:focus { left:1rem; top:1rem; }

.site-header {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled { border-bottom-color: var(--rule); }
.header-inner {
  max-width: var(--max-page); margin: 0 auto; padding: .82rem clamp(1rem, 3vw, 2.25rem);
  display:flex; align-items:center; justify-content:space-between; gap:1rem;
}
.brand { text-decoration:none; display:flex; align-items:baseline; gap:.65rem; min-width:0; }
.brand-ja { font-family:var(--serif-family); font-weight:700; letter-spacing:.08em; }
.brand-en { font-size:.72rem; text-transform:uppercase; letter-spacing:.18em; color:var(--muted); white-space:nowrap; }
.header-actions { display:flex; align-items:center; gap:.35rem; }
.icon-btn, .text-btn {
  border:1px solid var(--rule); background:var(--surface); border-radius:999px;
  min-height:2.55rem; padding:.48rem .82rem; cursor:pointer;
  transition:transform .16s ease, border-color .16s ease, background .16s ease;
}
.icon-btn:hover,.text-btn:hover { transform:translateY(-1px); border-color:color-mix(in srgb,var(--ink) 32%,transparent); }
.icon-btn:focus-visible,.text-btn:focus-visible,a:focus-visible { outline:3px solid color-mix(in srgb,var(--accent) 45%,transparent); outline-offset:3px; }

main { min-height: 72vh; }
.page-shell { max-width:var(--max-page); margin:0 auto; padding:clamp(2rem,6vw,5rem) clamp(1rem,3vw,2.25rem) 4rem; }

.hero { padding:clamp(2.5rem,8vw,6.5rem) 0 clamp(2.3rem,6vw,4.5rem); max-width:900px; }
.eyebrow { color:var(--accent-ink); font-weight:700; letter-spacing:.16em; text-transform:uppercase; font-size:.73rem; }
.hero h1 { margin:.3rem 0 .85rem; font-family:var(--serif-family); font-size:clamp(3.4rem,10vw,7.6rem); line-height:.92; letter-spacing:-.055em; font-weight:600; }
.hero .jp-title { display:block; font-size:.45em; letter-spacing:.05em; margin-bottom:.35em; font-weight:500; }
.hero p { max-width:700px; font-family:var(--serif-family); font-size:clamp(1.05rem,2vw,1.35rem); color:var(--muted); margin:0; }
.continue-card {
  display:grid; grid-template-columns:1fr auto; gap:1.5rem; align-items:center;
  border-top:1px solid var(--rule); border-bottom:1px solid var(--rule);
  padding:1.35rem 0; margin-bottom:3.4rem;
}
.continue-card[hidden] { display:none; }
.continue-copy strong { display:block; font-family:var(--serif-family); font-size:1.25rem; }
.continue-copy span { color:var(--muted); font-size:.9rem; }
.continue-link { text-decoration:none; border-bottom:1px solid currentColor; padding-bottom:.12rem; }

.section-heading { display:flex; justify-content:space-between; align-items:end; gap:1rem; margin-bottom:1.3rem; }
.section-heading h2 { margin:0; font-family:var(--serif-family); font-size:clamp(1.7rem,3vw,2.4rem); }
.section-heading p { margin:0; color:var(--muted); font-size:.9rem; }

.volume-grid { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:clamp(1rem,2.6vw,2rem); }
.volume-card { text-decoration:none; display:block; }
.book-cover {
  aspect-ratio: 2 / 3; border-radius:3px; overflow:hidden; position:relative;
  background:#191717; color:#f4eee4; box-shadow:var(--shadow);
  transform:translateZ(0); transition:transform .22s ease, box-shadow .22s ease;
}
.volume-card:hover .book-cover { transform:translateY(-7px) rotate(-.35deg); box-shadow:0 30px 80px rgba(30,25,20,.18); }
.book-cover.has-image { background:var(--bg-soft); }
.book-cover.has-image img { width:100%; height:100%; object-fit:cover; display:block; }
.book-cover.has-image:before,.book-cover.has-image:after { display:none; }
.book-cover:before { content:''; position:absolute; inset:0; background:linear-gradient(135deg,transparent 48%,rgba(255,255,255,.08) 49%,transparent 50%), radial-gradient(circle at 75% 20%,rgba(255,255,255,.13),transparent 22%); opacity:.75; }
.book-cover:after { content:''; position:absolute; inset:8% 9%; border:1px solid rgba(244,238,228,.42); pointer-events:none; }
.cover-no { position:absolute; top:10%; left:11%; font-size:.72rem; letter-spacing:.18em; text-transform:uppercase; }
.cover-ja { position:absolute; right:12%; top:16%; writing-mode:vertical-rl; font-family:var(--serif-family); font-size:clamp(1.5rem,3vw,2.25rem); letter-spacing:.13em; font-weight:600; }
.cover-mark { position:absolute; left:12%; bottom:14%; width:42%; aspect-ratio:1; border:1px solid rgba(244,238,228,.52); border-radius:50%; }
.cover-mark:before,.cover-mark:after { content:''; position:absolute; inset:17%; border:1px solid rgba(244,238,228,.4); transform:rotate(45deg); }
.cover-mark:after { inset:32%; border-radius:50%; transform:none; }
.volume-card:nth-child(3n+2) .book-cover { background:#5f2924; }
.volume-card:nth-child(3n+3) .book-cover { background:#263438; }
.volume-card:nth-child(4n) .book-cover { background:#342b22; }
.volume-meta { padding:.85rem .08rem 0; }
.volume-meta strong { display:block; font-family:var(--serif-family); font-size:1.03rem; }
.volume-meta span { display:block; color:var(--muted); font-size:.78rem; margin-top:.2rem; }

.footer { max-width:var(--max-page); margin:0 auto; padding:1.5rem clamp(1rem,3vw,2.25rem) 2.3rem; border-top:1px solid var(--rule); display:flex; justify-content:space-between; gap:1rem; flex-wrap:wrap; color:var(--muted); font-size:.75rem; }
.footer a { text-decoration:none; border-bottom:1px solid transparent; }
.footer a:hover { border-bottom-color:currentColor; }
.footer-nav { display:flex; gap:1rem; }

/* volume */
.volume-hero { display:grid; grid-template-columns:minmax(180px,290px) 1fr; gap:clamp(2rem,7vw,6rem); align-items:end; padding:clamp(2rem,6vw,5rem) 0 4rem; }
.volume-hero .book-cover { width:100%; }
.volume-hero h1 { font-family:var(--serif-family); font-size:clamp(2.8rem,7vw,5.8rem); line-height:.96; margin:.45rem 0 1rem; letter-spacing:-.04em; }
.volume-hero p { color:var(--muted); max-width:580px; }
.volume-ja { font-family:var(--serif-family); font-size:1.05rem; margin-top:-.35rem; }
.empty-note { color:var(--muted); font-family:var(--serif-family); }
.book-group h2 small,.chapter-title small { display:block; color:var(--muted); font-size:.62em; font-weight:400; margin-top:.25rem; }
.chapter-list a.is-complete .chapter-title { color:var(--muted); }
.contents { max-width:850px; margin-left:auto; }
.book-group { padding:3rem 0; border-top:1px solid var(--rule); }
.book-label { font-size:.72rem; text-transform:uppercase; letter-spacing:.18em; color:var(--accent-ink); font-weight:700; }
.book-group h2 { font-family:var(--serif-family); font-size:clamp(2.1rem,4vw,3.4rem); margin:.3rem 0 1.7rem; }
.part { margin:2.1rem 0 0; }
.part h3 { margin:0 0 .75rem; font-size:.78rem; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); }
.chapter-list { list-style:none; padding:0; margin:0; }
.chapter-list li { border-top:1px solid var(--rule); }
.chapter-list li:last-child { border-bottom:1px solid var(--rule); }
.chapter-list a,.chapter-row { min-height:3.5rem; display:grid; grid-template-columns:3rem 1fr auto; align-items:center; gap:.7rem; text-decoration:none; padding:.6rem .2rem; }
.chapter-list a:hover .chapter-title { color:var(--accent-ink); }
.chapter-no { color:var(--muted); font-size:.76rem; font-variant-numeric:tabular-nums; }
.chapter-title { font-family:var(--serif-family); font-size:1rem; }
.chapter-status { color:var(--muted); font-size:.72rem; }

/* reader */
.progress-line { position:fixed; z-index:20; top:0; left:0; width:0; height:2px; background:var(--accent); transition:width .08s linear; }
.reader-shell { max-width:var(--max-reader); margin:0 auto; padding:clamp(3rem,9vw,7rem) clamp(1.15rem,4vw,2rem) 5rem; }
.reader-meta { color:var(--muted); text-transform:uppercase; letter-spacing:.13em; font-size:.7rem; margin-bottom:2.6rem; }
.reader-title { font-family:var(--reader-family); font-size:clamp(2.5rem,7vw,4.8rem); line-height:1.02; margin:0; letter-spacing:-.035em; }
.reader-subtitle { font-family:var(--reader-family); font-size:clamp(1.15rem,2vw,1.45rem); color:var(--muted); margin:.8rem 0 3rem; font-weight:400; }
.reader-japanese-title { font-family:var(--reader-family); color:var(--muted); margin:.8rem 0 3rem; }
.reader-subtitle + .reader-japanese-title { margin:-2.5rem 0 3rem; }
.reader-prose { font-family:var(--reader-family); font-size:var(--reader-size); line-height:var(--reader-leading); letter-spacing:.002em; }
.reader-title + .reader-prose { margin-top:clamp(2rem,5vw,3rem); }
.reader-title + .reader-japanese-title { margin-top:.8rem; }
.reader-prose p { margin:0 0 1.25em; }
.reader-prose h1,.reader-prose h2,.reader-prose h3,.reader-prose h4 { font-family:var(--reader-family); line-height:1.25; margin:2em 0 .65em; }
.reader-prose blockquote { margin:1.8em 0; padding-left:1.2em; border-left:2px solid var(--rule); color:var(--muted); }
.reader-prose ul,.reader-prose ol { padding-left:1.5em; margin:0 0 1.4em; }
.reader-prose code { font-size:.9em; }
.reader-prose img,.about-body img { max-width:100%; height:auto; display:block; margin:2rem auto; }
.reader-prose .scene-break { text-align:center; letter-spacing:.5em; margin:2.2em 0; color:var(--muted); }
.reader-prose [lang='ja'] { font-feature-settings:'palt' 1; }
.footnote-ref { font-size:.68em; line-height:0; vertical-align:super; }
.footnote-ref a { color:var(--accent-ink); padding:0 .08em; text-decoration:none; }
.footnotes { border-top:1px solid var(--rule); color:var(--muted); font-size:.86em; margin-top:3.5em; padding-top:1.5em; }
.footnotes h2 { color:var(--muted); font-family:var(--ui-family); font-size:.72rem; letter-spacing:.14em; margin:0 0 1.1rem; text-transform:uppercase; }
.footnotes ol { margin:0; padding-left:1.5em; }
.footnotes li { margin:0 0 .75em; padding-left:.25em; }
.footnote-backref { color:var(--accent-ink); margin-left:.55em; text-decoration:none; white-space:nowrap; }
.footnote-ref a:target,.footnotes li:target { color:var(--ink); }
.reader-nav { max-width:var(--max-reader); margin:0 auto; padding:0 clamp(1.15rem,4vw,2rem) 5rem; display:grid; grid-template-columns:1fr auto 1fr; gap:1rem; align-items:center; }
.reader-nav a { text-decoration:none; min-height:3.1rem; min-width:0; display:flex; align-items:center; line-height:1.4; }
.reader-nav a:last-child { justify-content:flex-end; text-align:right; }
.reader-nav .contents-link { font-size:.8rem; color:var(--muted); }

/* settings */
.settings-backdrop { position:fixed; inset:0; background:rgba(0,0,0,.22); z-index:39; opacity:0; pointer-events:none; transition:opacity .18s ease; }
.settings-panel { position:fixed; z-index:40; right:clamp(1rem,3vw,2rem); top:4.2rem; width:min(340px,calc(100vw - 2rem)); background:var(--surface-strong); border:1px solid var(--rule); box-shadow:var(--shadow); border-radius:18px; padding:1.1rem; transform:translateY(-8px); opacity:0; pointer-events:none; transition:.18s ease; }
.settings-open .settings-backdrop { opacity:1; pointer-events:auto; }
.settings-open .settings-panel { transform:none; opacity:1; pointer-events:auto; }
.settings-head { display:flex; justify-content:space-between; align-items:center; margin-bottom:1rem; }
.settings-head strong { font-family:var(--serif-family); font-size:1.15rem; }
.settings-close { border:0; background:transparent; cursor:pointer; font-size:1.25rem; }
.setting-group { padding:1rem 0; border-top:1px solid var(--rule); }
.setting-label { display:block; font-size:.7rem; text-transform:uppercase; letter-spacing:.14em; color:var(--muted); margin-bottom:.7rem; }
.segmented { display:grid; grid-auto-flow:column; grid-auto-columns:1fr; gap:.3rem; background:var(--bg-soft); border-radius:12px; padding:.28rem; }
.segmented button { border:0; background:transparent; border-radius:9px; padding:.55rem .35rem; cursor:pointer; font-size:.78rem; }
.segmented button.active { background:var(--surface-strong); box-shadow:0 1px 5px rgba(0,0,0,.08); }
.size-control { display:grid; grid-template-columns:1fr 1fr 1fr; gap:.4rem; }
.size-control button { border:1px solid var(--rule); background:var(--surface); border-radius:10px; padding:.62rem; cursor:pointer; }

.about { max-width:760px; margin:0 auto; padding:clamp(4rem,10vw,8rem) clamp(1rem,4vw,2rem) 6rem; }
.about h1 { font-family:var(--serif-family); font-size:clamp(3rem,8vw,5.5rem); margin:0 0 2rem; }
.about-body { font-family:var(--serif-family); font-size:1.08rem; line-height:1.8; }
.about-body h2 { margin:2.5rem 0 .6rem; font-size:1.5rem; }
.about-body h3 { margin:2rem 0 .5rem; }
.about-body blockquote { border-left:2px solid var(--rule); margin:1.5rem 0; padding-left:1rem; color:var(--muted); }
.about-body a { text-underline-offset:.18em; }

@media (max-width:900px) {
  .volume-grid { grid-template-columns:repeat(3,minmax(0,1fr)); }
}
@media (max-width:700px) {
  .brand-en { display:none; }
  .volume-grid { grid-template-columns:repeat(2,minmax(0,1fr)); gap:1.2rem .9rem; }
  .volume-hero { grid-template-columns:120px 1fr; align-items:start; gap:1.4rem; }
  .volume-hero h1 { font-size:clamp(2rem,9vw,3.5rem); }
  .contents { margin-left:0; }
  .chapter-list a,.chapter-row { grid-template-columns:2.4rem 1fr; }
  .chapter-status { display:none; }
  .settings-panel { left:0; right:0; top:auto; bottom:0; width:100%; max-width:none; border-radius:22px 22px 0 0; padding:1.2rem 1.15rem calc(1.2rem + env(safe-area-inset-bottom)); transform:translateY(18px); }
  .reader-nav { grid-template-columns:1fr 1fr; }
  .reader-nav .contents-link { grid-row:2; grid-column:1/-1; justify-content:center; order:3; }
}
@media (max-width:430px) {
  .hero h1 { font-size:clamp(2.7rem,12vw,3.8rem); letter-spacing:-.045em; }
  .page-shell { padding-top:1.2rem; }
  .volume-hero { grid-template-columns:96px 1fr; }
  .volume-hero p { font-size:.84rem; }
}
@media (prefers-reduced-motion: reduce) {
  *,*::before,*::after { scroll-behavior:auto!important; transition:none!important; animation:none!important; }
}