* {
  box-sizing: border-box;
}

html {
  font-family: var(--font-body);
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-surface);
}

.container {
  width: min(var(--layout-max-width), calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 20px 0;
}

.site-name {
  color: inherit;
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
}

.home-hero {
  padding: 80px 0;
}

.home-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(36px, 6vw, 64px);
}

.home-hero p {
  max-width: 640px;
  margin: 0;
  font-size: 18px;
  line-height: 1.6;
}

.site-footer {
  margin-top: 80px;
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  font-size: 14px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.desktop-nav a,
.nav-more-button {
  color: inherit;
  font: inherit;
  text-decoration: none;
  background: none;
  border: 0;
  cursor: pointer;
}

.nav-more {
  position: relative;
}

.nav-more-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 160px;
  padding: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.nav-more:hover .nav-more-menu,
.nav-more:focus-within .nav-more-menu {
  display: grid;
}

.nav-more-menu a {
  padding: 10px 12px;
}

.mobile-nav,
.mobile-more-panel {
  display: none;
}

@media (max-width: 767px) {

  body {
    padding-bottom: 72px;
  }

  .desktop-nav {
    display: none;
  }

  .mobile-nav {
    position: fixed;
    z-index: 100;
    right: 0;
    bottom: 0;
    left: 0;

    display: grid;

    min-height: 64px;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
  }

  .mobile-nav-item {
    display: flex;
    align-items: center;
    justify-content: center;

    color: inherit;
    font: inherit;
    font-size: 13px;
    text-decoration: none;

    background: none;
    border: 0;
  }

  .mobile-more-panel {
    position: fixed;
    z-index: 99;
    right: 16px;
    bottom: 76px;

    width: min(240px, calc(100% - 32px));
    padding: 8px;

    background: var(--color-surface);
    border: 1px solid var(--color-border);
  }

  .mobile-more-panel:not([hidden]) {
    display: block;
  }

  .mobile-more-content {
    display: grid;
  }

  .mobile-more-content a {
    padding: 12px;
    color: inherit;
    text-decoration: none;
  }

}

.section-page,
.article-page {
  padding: 64px 0;
}

.section-header {
  margin-bottom: 48px;
}

.section-header h1,
.article-header h1 {
  margin-top: 0;
}

.section-header p,
.article-description {
  max-width: 680px;
  line-height: 1.6;
}

.post-list {
  display: grid;
  gap: 24px;
}

.post-card {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.post-card h2 {
  margin: 0 0 8px;
}

.post-card h2 a {
  color: inherit;
  text-decoration: none;
}

.post-card p {
  max-width: 680px;
  line-height: 1.6;
}

.post-card time,
.article-header time {
  font-size: 14px;
  color: var(--color-muted);
}

.article-container {
  max-width: var(--layout-content-width);
}

.article-header {
  margin-bottom: 40px;
}

.article-content {
  font-size: 18px;
  line-height: 1.8;
}

.article-content img {
  max-width: 100%;
  height: auto;
}

.standard-page {
  padding: 64px 0;
}

.standard-page-container {
  max-width: var(--layout-content-width);
}

.standard-page-header {
  margin-bottom: 40px;
}

.standard-page-header h1 {
  margin-top: 0;
}

.standard-page-header p {
  max-width: 680px;
  line-height: 1.6;
}

.standard-page-content {
  font-size: 18px;
  line-height: 1.8;
}

.standard-page-content h2,
.standard-page-content h3 {
  margin-top: 2em;
}

.standard-page-content img {
  max-width: 100%;
  height: auto;
}

.cover-image {
  margin: 0 0 24px;
}

.cover-image img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.post-card .cover-image img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.book-library,
.book-page {
  padding: 64px 0;
}

.book-grid {
  display: grid;
  gap: 32px;
}

.book-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.book-cover {
  margin: 0;
}

.book-cover img,
.book-cover-placeholder {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: 8px;
}

.book-cover-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-border);
  color: var(--color-muted);
  font-size: 14px;
}

.book-card h2 {
  margin: 0 0 8px;
}

.book-card h2 a {
  color: inherit;
  text-decoration: none;
}

.book-author,
.book-original-title {
  color: var(--color-muted);
}

.book-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 12px 0;
  font-size: 14px;
}

.book-description,
.book-summary {
  line-height: 1.7;
}

.book-page-container {
  max-width: var(--layout-content-width);
}

.book-header {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  align-items: start;
  margin-bottom: 56px;
}

.book-header-info h1 {
  margin-top: 0;
}

.book-content {
  font-size: 18px;
  line-height: 1.8;
}

.book-content h2 {
  margin-top: 2em;
}

@media (max-width: 767px) {

  .book-card {
    grid-template-columns: 100px 1fr;
    gap: 16px;
  }

  .book-header {
    grid-template-columns: 120px 1fr;
    gap: 20px;
  }

  .book-header-info h1 {
    font-size: 28px;
  }

}

.home-hero {
  padding: 96px 0 80px;
}

.home-hero-inner {
  max-width: 760px;
}

.home-eyebrow {
  margin: 0 0 12px;
  color: var(--color-muted);
  font-size: 14px;
}

.home-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(42px, 8vw, 72px);
  line-height: 1.1;
}

.home-intro {
  max-width: 640px;
  margin: 0 0 28px;
  font-size: 20px;
  line-height: 1.7;
}

.home-primary-link {
  display: inline-block;
  color: inherit;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.home-section {
  padding: 64px 0;
  border-top: 1px solid var(--color-border);
}

.home-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
}

.home-section-header h2,
.home-about h2 {
  margin: 0;
}

.home-section-header a,
.home-about a {
  color: inherit;
}

.home-book-list {
  display: grid;
  gap: 28px;
}

.home-book-card {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 20px;
  align-items: start;
}

.home-book-card h3 {
  margin: 0 0 8px;
}

.home-book-card h3 a {
  color: inherit;
  text-decoration: none;
}

.home-book-card p {
  line-height: 1.6;
}

.home-about p {
  max-width: 680px;
  font-size: 18px;
  line-height: 1.8;
}

@media (max-width: 767px) {

  .home-hero {
    padding: 64px 0 48px;
  }

  .home-intro {
    font-size: 18px;
  }

  .home-section {
    padding: 48px 0;
  }

  .home-book-card {
    grid-template-columns: 80px 1fr;
    gap: 16px;
  }

}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.site-brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-logo {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  object-fit: contain;
}

.site-brand-name {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
}

.site-brand-english {
  color: var(--color-muted);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.desktop-nav a,
.nav-more-button {
  padding: 8px 0;
}

.desktop-nav a:hover,
.nav-more-button:hover {
  opacity: 0.65;
}

@media (max-width: 767px) {

  .site-brand-english {
    display: none;
  }

  .mobile-nav {
    grid-template-columns: repeat(var(--mobile-nav-count), minmax(0, 1fr));
  }

  .mobile-nav-item {
    min-height: 64px;
    padding: 8px 4px;
    cursor: pointer;
  }

}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
}

a {
  text-underline-offset: 3px;
}

::selection {
  background: var(--color-border);
}

.book-shelf {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 48px 28px;
}

.book-shelf-item {
  min-width: 0;
}

.book-shelf-cover {
  display: block;
  margin-bottom: 18px;
  color: inherit;
  text-decoration: none;
}

.book-shelf-cover .book-cover img,
.book-shelf-cover .book-cover-placeholder {
  transition: transform 0.2s ease;
}

.book-shelf-cover:hover .book-cover img,
.book-shelf-cover:hover .book-cover-placeholder {
  transform: translateY(-3px);
}

.book-shelf-info h2 {
  margin: 0 0 6px;
  font-size: 20px;
  line-height: 1.4;
}

.book-shelf-info h2 a {
  color: inherit;
  text-decoration: none;
}

.book-shelf-info h2 a:hover {
  color: var(--color-primary);
}

.book-shelf-info .book-author {
  margin: 0 0 10px;
  font-size: 14px;
}

.book-shelf-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
  color: var(--color-muted);
  font-size: 13px;
}

.book-shelf-meta span {
  padding: 4px 8px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
}

.book-shelf-description {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.7;
}

@media (max-width: 960px) {
  .book-shelf {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .book-shelf {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px 18px;
  }

  .book-shelf-info h2 {
    font-size: 18px;
  }

  .book-shelf-description {
    display: none;
  }
}

.book-detail-container {
  max-width: 960px;
}

.book-detail-hero {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
  padding-bottom: 64px;
}

.book-detail-cover {
  position: sticky;
  top: 32px;
}

.book-detail-info {
  padding-top: 8px;
}

.book-detail-status {
  display: inline-block;
  margin: 0 0 18px;
  padding: 5px 10px;
  color: var(--color-primary);
  font-size: 13px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
}

.book-detail-info h1 {
  margin: 0 0 10px;
  font-size: clamp(36px, 6vw, 56px);
  line-height: 1.2;
}

.book-original-title {
  margin: 0 0 12px;
  color: var(--color-muted);
  font-size: 16px;
}

.book-detail-author {
  margin: 0 0 24px;
  font-size: 16px;
}

.book-detail-summary {
  max-width: 620px;
  margin: 0 0 32px;
  color: var(--color-muted);
  font-size: 17px;
  line-height: 1.8;
}

.book-detail-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
}

.book-detail-meta div {
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}

.book-detail-meta dt {
  margin-bottom: 6px;
  color: var(--color-muted);
  font-size: 12px;
}

.book-detail-meta dd {
  margin: 0;
  font-size: 15px;
}

.book-notes {
  max-width: var(--layout-content-width);
  margin: 0 auto;
  padding-top: 56px;
  border-top: 1px solid var(--color-border);
}

.book-notes-heading {
  margin-bottom: 40px;
}

.book-notes-heading p {
  margin: 0 0 8px;
  color: var(--color-muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.book-notes-heading h2 {
  margin: 0;
  font-size: 32px;
}

.book-content {
  font-size: 18px;
  line-height: 1.9;
}

.book-content p {
  margin: 0 0 1.4em;
}

.book-content h2 {
  margin-top: 2.4em;
  margin-bottom: 0.8em;
  font-size: 28px;
}

.book-content h3 {
  margin-top: 2em;
}

@media (max-width: 767px) {

  .book-detail-hero {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 20px;
    padding-bottom: 48px;
  }

  .book-detail-cover {
    position: static;
  }

  .book-detail-info h1 {
    font-size: 30px;
  }

  .book-detail-summary {
    grid-column: 1 / -1;
  }

  .book-detail-meta {
    grid-template-columns: 1fr;
  }

  .book-notes {
    padding-top: 40px;
  }

  .book-content {
    font-size: 17px;
  }

}

.breadcrumbs {
  margin-bottom: 32px;
  font-size: 14px;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  color: var(--color-muted);
}

.breadcrumbs li:not(:last-child)::after {
  content: "›";
  margin-left: 8px;
  color: var(--color-border);
}

.breadcrumbs a {
  color: var(--color-muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--color-text);
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-text);
}

.book-detail-meta {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.book-detail-meta dd {
  line-height: 1.5;
}

@media (max-width: 767px) {
  .book-detail-meta {
    grid-template-columns: 1fr;
  }
}

.book-note-byline {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

.book-note-byline a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.book-note-byline a:hover {
  color: var(--color-text);
}

.book-note-byline span {
  margin: 0 6px;
}

.related-books {
  margin-top: 72px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}

.related-books-heading {
  margin-bottom: 24px;
}

.related-books-heading > p {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.related-books-heading h2 {
  margin: 0;
}

.related-books-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.related-book-card {
  min-width: 0;
}

.related-book-cover {
  display: block;
  margin-bottom: 14px;
}

.related-book-info h3 {
  margin: 0;
  font-size: 17px;
  line-height: 1.45;
}

.related-book-info h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.related-book-info h3 a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.related-book-author {
  margin: 7px 0 0;
  font-size: 13px;
  color: var(--color-muted);
}

.related-book-description {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-muted);
}

@media (max-width: 960px) {
  .related-books-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .related-books {
    margin-top: 56px;
    padding-top: 36px;
  }

  .related-books-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 16px;
  }

  .related-book-description {
    display: none;
  }
}

/* Breadcrumb layout fix */
.book-detail-container .breadcrumbs ol {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.book-detail-container .breadcrumbs li {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  width: auto;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}

.book-detail-container .breadcrumbs li:not(:last-child)::after {
  content: "›";
  display: inline-block;
  margin: 0 8px;
  color: var(--color-border);
}

.book-detail-container .breadcrumbs li:last-child {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 767px) {
  .book-detail-container .breadcrumbs {
    overflow-x: auto;
    scrollbar-width: none;
  }

  .book-detail-container .breadcrumbs::-webkit-scrollbar {
    display: none;
  }
}

/* Book detail: mobile and tablet stacked layout */
@media (max-width: 1023px) {
  .book-detail-hero {
    display: flex;
    flex-direction: column;
    gap: 28px;
  }

  .book-detail-cover {
    width: 100%;
    max-width: 220px;
    margin: 0 auto;
  }

  .book-detail-info {
    width: 100%;
  }

  .book-detail-info h1 {
    margin-top: 0;
  }

  .book-detail-meta {
    grid-template-columns: 1fr;
  }

  .book-detail-meta > div {
    display: block;
  }

  .book-detail-meta dt {
    margin-bottom: 4px;
  }

  .book-detail-meta dd {
    margin-left: 0;
  }
}

/* Book cover: keep static on all screen sizes */
.book-detail-cover {
  position: static !important;
  top: auto !important;
  align-self: auto !important;
  transform: none !important;
}

.book-detail-cover:hover,
.book-detail-cover img:hover {
  transform: none !important;
}

.book-category-links a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 3px;
}

.book-category-links a:hover {
  color: var(--color-primary);
  text-decoration-color: currentColor;
}


.book-category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 40px;
}

.book-category-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 7px 13px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.3;
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: 999px;
}

.book-category-nav a:hover {
  color: var(--color-text);
  border-color: var(--color-muted);
}

.book-category-nav a[aria-current="page"] {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.book-category-eyebrow {
  margin: 0 0 8px;
  color: var(--color-muted);
  font-size: 13px;
  letter-spacing: 0.06em;
}

@media (max-width: 767px) {
  .book-category-nav {
    gap: 8px;
    margin-bottom: 32px;
  }

  .book-category-nav a {
    min-height: 36px;
    padding: 6px 11px;
    font-size: 13px;
  }
}