/* 小石川図案｜検証用 v2 (2026.10.20)
   書影とロゴが揃うまでデザインは未確定。明朝／余白／情報導線の検証用。
   日本語明朝は端末にインストールされたフォントから選択します。 */
:root {
  --paper:#faf9f6; --ink:#252525; --muted:#77746f;
  --line:#d9d6cf; --field:#f1efea;
  --wide:1120px; --reading:640px;
  --serif:"dnp-shuei-nmincho-std","Hiragino Mincho ProN","Hiragino Mincho Pro","Yu Mincho","Noto Serif CJK JP","Noto Serif JP",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Noto Sans CJK JP",sans-serif;
}
*,*::before,*::after {box-sizing:border-box}
html {scroll-behavior:smooth}
body {margin:0;background:var(--paper);color:var(--ink);font:15px/2 var(--serif);font-weight:400;-webkit-font-smoothing:antialiased}
a {color:inherit;text-decoration:none}
a:hover {opacity:.72}
a:focus-visible,button:focus-visible {outline:2px solid #635d53;outline-offset:4px}
button {font:inherit;color:inherit;cursor:pointer}
img {max-width:100%;display:block}
h1,h2,h3,p {margin-top:0}
h1,h2,h3 {font-weight:400;line-height:1.55}
[hidden] {display:none!important}
.container,.header-inner {width:min(var(--wide),calc(100% - 88px));margin-inline:auto}
.skip-link {position:absolute;left:-9999px;top:0;z-index:11;padding:7px 14px;background:white}
.skip-link:focus {left:0}
.eyebrow,.reading,.primary-nav,.menu-toggle,.text-link,.button-link,.news-list,.social-links,.site-footer,.carousel-controls,.back-link,.links-footnote,.link-list small {font-family:var(--sans)}
.eyebrow {font-size:10px;letter-spacing:.15em;color:var(--muted);font-weight:400}
.reading {font-size:12px;letter-spacing:.09em;color:var(--muted)}
.site-header {border-bottom:1px solid var(--line);background:var(--paper)}
.header-inner {display:flex;align-items:center;justify-content:space-between;gap:26px;min-height:96px}
.brand {font-family:var(--serif);font-size:20px;letter-spacing:.12em;line-height:1.05;white-space:nowrap}
.brand span {font:8px/1.3 var(--sans);display:block;letter-spacing:.2em;margin-top:11px;color:var(--muted)}
.primary-nav {display:flex;align-items:center;gap:clamp(20px,2.5vw,39px)}
.primary-nav a {font-size:11px;letter-spacing:.12em;padding:9px 0}
.primary-nav a[aria-current] {box-shadow:0 1px 0 var(--ink)}
.primary-nav a.secondary {color:var(--muted)}
.menu-toggle {display:none;background:transparent;border:0;font-size:11px;letter-spacing:.13em;padding:13px 0}
.hero {padding-top:38px}
.hero-slide {display:grid;grid-template-columns:51% 49%;min-height:490px;background:var(--field)}
.hero-art {min-width:0;padding:45px;display:grid;place-items:center}
.hero-art>img {max-height:430px;width:auto;object-fit:contain}
.art-placeholder {width:min(100%,405px);aspect-ratio:1;display:flex;flex-direction:column;justify-content:space-between;background:#e8e5de;border:1px solid #d6d1c9;color:#848077;padding:26px}
.art-note {font:10px/1.5 var(--sans);letter-spacing:.2em}
.art-caption {font-size:12px;align-self:center;letter-spacing:.08em}
.hero-content {display:flex;flex-direction:column;justify-content:center;align-items:flex-start;padding:70px clamp(30px,6.3vw,100px) 70px 24px}
.hero-content h1 {font-size:clamp(30px,3.9vw,52px);letter-spacing:.08em;margin:17px 0 2px;overflow-wrap:anywhere}
.hero-tagline {max-width:360px;margin:34px 0 24px;font-size:15px;line-height:2.05;letter-spacing:.035em}
.text-link {display:inline-flex;align-items:baseline;gap:15px;font-size:12px;letter-spacing:.045em;border-bottom:1px solid var(--ink);padding-bottom:4px}
.hero-link {margin-top:3px}
.carousel-controls {display:flex;justify-content:flex-end;align-items:center;gap:16px;padding:12px 3px}
.arrow {background:transparent;border:0;width:32px;height:32px;font-size:19px;font-family:var(--sans)}
.dots {display:flex;gap:10px;align-items:center}
.dot {width:7px;height:7px;padding:0;border:1px solid #a59f97;background:transparent;border-radius:50%}
.dot[aria-current="true"] {background:var(--ink);border-color:var(--ink)}
.information {margin:88px 0 122px;max-width:100%;padding:0 0 28px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.info-header {padding-top:16px;margin-bottom:7px}
.info-header h2 {font:10px/1.4 var(--sans);letter-spacing:.2em;color:var(--muted);margin:0}
.news-item {display:grid;grid-template-columns:110px 1fr 20px;align-items:baseline;gap:20px;padding:14px 1px;font:12px/1.85 var(--sans);border-bottom:1px solid #e7e3dc}
.news-item time {color:var(--muted);font-size:11px;font-variant-numeric:tabular-nums}
.news-title {line-height:1.8}
.news-arrow {justify-self:end;font-size:15px;color:var(--muted)}
.social-links {display:flex;align-items:center;gap:34px;flex-wrap:wrap;font-size:11px;letter-spacing:.035em}
.social-links a span {padding-left:3px;font-size:12px}
.info-social {display:flex;justify-content:flex-end;padding:18px 2px 0}
.intro-block {display:grid;grid-template-columns:46% 54%;gap:28px;padding:0 0 145px;align-items:start}
.intro-block h2 {font-size:clamp(25px,3vw,35px);letter-spacing:.095em;margin-top:13px}
.intro-block>div:last-child {max-width:490px;padding-top:29px;font-size:15px;line-height:2.25;letter-spacing:.02em}
.intro-block>div:last-child p {margin-bottom:13px}
.home-section {margin-bottom:130px}
.section-heading {display:flex;justify-content:space-between;align-items:end;margin-bottom:33px}
.section-heading h2 {font-size:28px;letter-spacing:.12em;margin-bottom:0}
.book-grid {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:30px}
.book-art {background:var(--field);aspect-ratio:1/1.05;display:grid;place-items:center;padding:22px}
.book-art img {width:100%;height:100%;object-fit:contain}
.book-art .art-placeholder {width:100%;padding:18px}
.book-art .art-caption {font-size:11px;text-align:center}
.book-copy {padding:21px 0 12px}
.book-copy h2 {font-size:21px;line-height:1.55;margin:10px 0 2px;letter-spacing:.04em;overflow-wrap:anywhere}
.book-copy>p:not(.eyebrow):not(.reading) {font-size:13px;line-height:2;min-height:57px}
.book-copy .text-link {margin-top:2px}
.works-line {margin:0 0 132px;padding:26px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;gap:35px;align-items:center}
.works-line>* {margin:0}
.works-line p {flex:1;font-size:14px;letter-spacing:.06em}
.page {padding-top:85px;padding-bottom:150px;min-height:65vh}
.page-title {padding-bottom:58px}
.page-title h1 {font:400 clamp(46px,6vw,72px)/1.25 var(--serif);letter-spacing:.14em;margin:16px 0 16px}
.page-title>p:last-child {color:var(--muted)}
.back-link {font-size:11px;display:inline-block;border-bottom:1px solid var(--line);margin-bottom:32px}
.detail-grid {display:grid;grid-template-columns:46% 54%;background:var(--field)}
.detail-art {display:grid;place-items:center;min-width:0;padding:45px}
.detail-art>img {max-height:550px;object-fit:contain}
.detail-copy {padding:58px 55px 65px 23px}
.detail-copy h1 {font-size:clamp(29px,4vw,51px);letter-spacing:.035em;overflow-wrap:anywhere;margin:17px 0 8px}
.detail-tagline {font-size:16px;margin:37px 0 28px;line-height:2.1}
.detail-description {max-width:var(--reading);font-size:14px;line-height:2.2}
.detail-links {display:flex;flex-wrap:wrap;align-items:center;gap:13px;margin-top:27px}
.button-link {display:inline-flex;align-items:center;justify-content:center;background:var(--ink);color:#fff;min-height:43px;padding:11px 17px;font-size:11px;letter-spacing:.045em}
.button-link.outline {color:var(--ink);background:transparent;border:1px solid var(--ink)}
.notice {margin-top:25px;border-left:1px solid var(--ink);padding-left:15px;color:var(--muted);font-size:13px}
.next-book {display:flex;gap:20px;justify-content:space-between;margin-top:65px;border-top:1px solid var(--line);padding-top:22px;font:11px/1.8 var(--sans)}
.works-reserve {border-top:1px solid var(--line);padding:70px 0;max-width:var(--reading)}
.works-reserve h2 {font-size:25px;letter-spacing:.08em;margin-bottom:20px}
.about-grid {display:grid;grid-template-columns:43% 57%;gap:30px;border-top:1px solid var(--line);padding-top:49px}
.about-grid h2 {font-size:22px;line-height:1.8;margin-top:25px;letter-spacing:.045em}
.about-prose {max-width:var(--reading);line-height:2.25;letter-spacing:.02em}
.about-prose>p {margin-bottom:17px}
.about-contact {margin-top:70px}
.about-social {margin-top:46px}
.about-contact .eyebrow,.about-social .eyebrow {margin-bottom:17px}
.links-page>section {margin-bottom:60px}
.links-page>section h2 {font-size:18px;margin-bottom:18px}
.link-list {list-style:none;margin:0;padding:0;border-top:1px solid var(--line);max-width:790px}
.link-list li {border-bottom:1px solid var(--line)}
.link-list a {padding:18px 2px;display:flex;justify-content:space-between;gap:30px;align-items:baseline}
.link-list small {font-size:11px;color:var(--muted)}
.links-footnote {margin-top:65px;font-size:11px;color:var(--muted);overflow-wrap:anywhere}
.site-footer {border-top:1px solid var(--line)}
.footer-inner {padding-top:28px;padding-bottom:36px;display:flex;justify-content:space-between;gap:28px;align-items:center;color:var(--muted);font-size:11px}
.footer-main {display:flex;gap:32px}
.footer-mobile-social {display:none}
@media (max-width:760px) {
  body {font-size:14px;line-height:2}
  .container,.header-inner {width:calc(100% - 36px)}
  .header-inner {min-height:67px}
  .brand {font-size:17px}
  .brand span {margin-top:8px;font-size:7px}
  .menu-toggle {display:block}
  .menu-toggle span {padding-left:6px}
  .primary-nav {display:none;position:absolute;top:67px;left:0;z-index:5;width:100%;background:var(--paper);padding:8px 20px 22px;border-bottom:1px solid var(--line);box-shadow:0 8px 16px #00000009;flex-direction:column;align-items:stretch;gap:0}
  .primary-nav.open {display:flex}
  .primary-nav a {font-size:12px;padding:13px 3px;border-bottom:1px solid var(--line)}
  .primary-nav a[aria-current] {box-shadow:none;font-weight:600}
  .hero {padding-top:17px}
  .hero-slide {display:flex;flex-direction:column;min-height:auto}
  .hero-art {padding:24px 22px 12px;min-height:275px}
  .hero-art .art-placeholder {max-width:260px;padding:17px}
  .hero-art>img {max-height:320px}
  .hero-content {padding:21px 28px 31px}
  .hero-content h1 {font-size:clamp(30px,8vw,43px);margin:11px 0 3px}
  .hero-tagline {margin:21px 0 22px;font-size:14px;line-height:2}
  .carousel-controls {padding:12px 0}
  .information {margin:56px 0 84px;padding-bottom:16px}
  .news-item {grid-template-columns:1fr 16px;gap:6px 12px;padding:12px 0}
  .news-item time {grid-column:1;font-size:10px}
  .news-item .news-title {grid-column:1;font-size:12px}
  .news-item .news-arrow {grid-row:1/3;grid-column:2;align-self:center}
  .info-social {display:none}
  .intro-block {display:block;padding-bottom:96px}
  .intro-block h2 {font-size:28px;margin:8px 0 16px}
  .intro-block>div:last-child {padding:0;font-size:14px}
  .home-section {margin-bottom:90px}
  .section-heading {margin-bottom:22px}
  .section-heading h2 {font-size:24px}
  .book-grid {grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}
  .book-art {padding:10px;aspect-ratio:1/1.12}
  .book-art .art-placeholder {padding:10px}
  .book-art .art-note {font-size:8px;letter-spacing:.05em}
  .book-art .art-caption {font-size:10px}
  .book-copy {padding:12px 0 8px}
  .book-copy h2 {font-size:17px}
  .book-copy>p:not(.eyebrow):not(.reading) {min-height:auto;font-size:12px}
  .works-line {gap:12px;margin-bottom:90px;flex-wrap:wrap}
  .works-line .eyebrow {width:100%}
  .works-line p {font-size:13px}
  .page {padding-top:55px;padding-bottom:95px}
  .page-title {padding-bottom:35px}
  .page-title h1 {font-size:49px}
  .detail-grid {display:flex;flex-direction:column}
  .detail-art {padding:29px;min-height:290px}
  .detail-art .art-placeholder {max-width:280px}
  .detail-art>img {max-height:390px}
  .detail-copy {padding:19px 28px 44px}
  .detail-copy h1 {font-size:32px}
  .detail-description {font-size:14px}
  .detail-tagline {margin:24px 0 17px}
  .about-grid {display:block;padding-top:30px}
  .about-grid h2 {margin-top:12px}
  .about-prose {margin-top:39px}
  .about-contact {margin-top:52px}
  .about-social {margin-top:35px}
  .link-list a {flex-direction:column;align-items:flex-start;gap:0}
  .footer-inner {display:flex;flex-direction:column;align-items:flex-start;gap:16px;padding:28px 0 39px}
  .footer-main {display:flex;gap:23px;flex-wrap:wrap}
  .footer-mobile-social {display:block;border-top:1px solid var(--line);padding-top:16px;width:100%;margin-top:3px}
}
@media (max-width:360px) {.book-grid {gap:12px}.book-copy h2 {font-size:15px}.hero-art {padding:20px}}
@media (prefers-reduced-motion:reduce) {html {scroll-behavior:auto}}

.brand .brand-logo {display:block;width:220px;height:auto;max-width:100%}
@media(max-width:700px){.brand .brand-logo{width:180px}}

/* Book photographs retain their full composition. */
.detail-grid:has(.detail-gallery) {grid-template-columns:1fr}
.detail-gallery {grid-template-columns:1fr 1fr;gap:28px;padding:45px 45px 12px;align-items:center}
.detail-gallery figure {margin:0;min-width:0;text-align:center}
.detail-gallery img {width:100%;height:auto;max-height:480px;object-fit:contain}
.detail-gallery figcaption {font-size:11px;letter-spacing:.12em;color:var(--muted);margin-top:12px}
.detail-grid:has(.detail-gallery) .detail-copy {padding:32px 45px 55px}
@media(max-width:700px){
 .detail-gallery {grid-template-columns:1fr;padding:25px;gap:30px}
 .detail-grid:has(.detail-gallery) .detail-copy {padding:12px 25px 35px}
}
.slides {display:grid;overflow:hidden}
.slides .hero-slide {grid-area:1 / 1}

.home-intro {text-align:center;padding:24px 0 18px;font-size:12px;line-height:1.9;letter-spacing:.035em}
.home-intro p {margin:0}
.home .hero {padding-top:0}
.hero-art:hover {opacity:1}
.hero-image-only {grid-template-columns:1fr}
.hero-image-only .hero-art {width:100%}
.autoplay-toggle {background:none;border:0;font:10px var(--sans);color:var(--muted);padding:10px 5px;min-height:32px}
.destination-group {margin:28px 0}
.destination-group h2 {font-size:14px;margin:0 0 12px}
.destination-links {display:flex;flex-wrap:wrap;gap:18px 28px}
.book-prices {font-size:12px;color:var(--muted);margin:25px 0}
@media(max-width:760px){.home-intro{padding:18px 4px;font-size:11px;line-height:1.85}.carousel-controls{gap:12px}}

/* Let the original photographs occupy the full left column without cropping. */
.hero-art {padding:0;overflow:hidden}
.hero-art>img {width:100%;height:auto;max-height:none;object-fit:contain}
.hero-content h1 {font-size:clamp(27px,3.2vw,42px)}
.hero-tagline {font-size:14px;line-height:2.05}
.detail-description {white-space:pre-line}
.bibliography {max-width:640px;margin:32px 0}
.bibliography h2 {font-size:14px;margin-bottom:12px}
.bibliography dl {margin:0;font-size:12px;line-height:1.9}
.bibliography dl>div {display:grid;grid-template-columns:90px 1fr;gap:16px;padding:8px 0;border-bottom:1px solid var(--line)}
.bibliography dt {color:var(--muted)}
.bibliography dd {margin:0;overflow-wrap:anywhere}
@media(max-width:760px){
 .hero-art {padding:0;min-height:0}
 .hero-art>img {width:100%;height:auto;max-height:none}
 .hero-art .art-placeholder {margin:24px auto}
 .hero-content h1 {font-size:clamp(26px,7vw,35px)}
 .hero-tagline {font-size:13px}
}

.title-suffix {font-size:.8em;white-space:nowrap}
.title-tail {white-space:nowrap}
.synopsis-large {font-size:16px;line-height:2.1;margin:30px 0 24px;white-space:normal}
.synopsis-large p {margin:0 0 .8em}
.synopsis-large p:last-child {margin-bottom:0}
.content-notice {font-size:12px;line-height:1.9;color:var(--muted);margin:22px 0 28px}
.overseas-edition {margin-top:34px;padding-top:23px;border-top:1px solid var(--line);max-width:640px}
.overseas-edition h2 {font-size:14px;margin-bottom:12px}
.overseas-edition p {font-size:13px;line-height:2}
@media(max-width:760px){.detail-description.synopsis-large{font-size:16px}}
/* Portrait replacements stay within the existing carousel frame. */
.hero-art>img {max-height:490px;object-fit:contain}
@media(max-width:760px){.hero-art>img{max-height:390px}}

/* Footer links and upcoming cover notice. */
.footer-mobile-social {display:block}
.footer-inner {flex-wrap:wrap}
.social-footer {gap:0}
.social-footer a + a::before {content:"｜";display:inline-block;margin:0 12px;color:var(--muted)}
.social-footer a>span {display:none}
.hero-cover-small .hero-art>img {transform:scale(.7)}
.detail-cover-note {display:grid;place-items:center;min-height:300px;background:var(--field);padding:36px}
.detail-cover-note p {font-size:14px;line-height:2.2;text-align:center}

/* WORKS: keep the site typography and give the supplied key visual room. */
.works-grid {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:64px 44px}
.work-card {min-width:0}
.work-card-image {display:block}
.work-card-image img {width:100%;height:auto;object-fit:contain}
.work-card-copy {padding-top:26px}
.work-card-copy h2 {font-size:23px;letter-spacing:.035em;margin-bottom:9px}
.work-card-role {font-size:12px;color:var(--muted);margin-bottom:21px;font-family:var(--sans)}
.work-detail-heading {margin-bottom:40px}
.work-detail-heading h1 {font-size:clamp(27px,3.4vw,42px);letter-spacing:.05em;margin:7px 0 0}
.work-key-visual {width:70%;max-width:574px;margin:0 auto 68px}
.work-key-visual img {width:100%;height:auto}
.work-details {max-width:680px;margin-inline:auto}
.work-description {font-size:15px;line-height:2.2;margin-bottom:34px}
.work-credits {border-top:1px solid var(--line);font-size:13px;margin:0}
.work-credits>div {display:grid;grid-template-columns:64px minmax(0,1fr);gap:24px;padding:16px 0;border-bottom:1px solid var(--line)}
.work-credits dt {color:var(--muted)}
.work-credits dd {margin:0}
@media(max-width:760px){
 .works-grid {grid-template-columns:1fr;gap:52px}
 .work-card-copy {padding-top:20px}
 .work-card-copy h2 {font-size:21px}
 .work-detail-heading {margin-bottom:28px}
 .work-detail-heading h1 {font-size:27px}
 .work-key-visual {margin-bottom:38px}
 .work-description {font-size:14px;margin-bottom:28px}
 .work-credits>div {gap:14px;grid-template-columns:42px minmax(0,1fr)}
}

.new-release-label {color:#b32624;display:inline-block;margin-left:.65em;letter-spacing:.04em}