:root {
  --primary: #111111;
  --primary-hover: #292929;
  --secondary: #FA5400;
  --neutral: #707072;
  --background: #ffffff;
  --surface: #f5f5f5;
  --border: #e5e5e5;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: Lato, system-ui, sans-serif;
  font-size: 15px;
  color: var(--primary);
  background: var(--background);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-tap-highlight-color: rgba(17, 17, 17, 0.08);
}

h1, h2, h3, .logo {
  font-family: Jost, sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
}

a { color: inherit; }

.site-nav {
  background: var(--background);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow 200ms ease-out;
}

.site-nav.scrolled {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 max(16px, env(safe-area-inset-right)) 0 max(16px, env(safe-area-inset-left));
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: relative;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: transform 200ms ease-out, opacity 200ms ease-out;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-links {
  display: flex;
  align-items: center;
}

.nav-links a {
  margin-left: 24px;
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav-links a:hover { color: var(--neutral); }

.logo {
  font-size: 20px;
  text-decoration: none;
  text-transform: uppercase;
  flex-shrink: 0;
}

.logo-brand {
  color: var(--primary);
}

.logo-accent {
  color: var(--secondary);
}

body.nav-open {
  overflow: hidden;
}

main { min-height: 60vh; }

.preview-banner {
  background: #fff8e6;
  border-bottom: 1px solid #f0d78c;
  color: #6b5700;
  text-align: center;
  padding: 10px 16px;
  font-size: 14px;
}

.hero {
  padding: 96px 24px 64px;
  max-width: 1440px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 72px;
  font-weight: 900;
  text-transform: uppercase;
  line-height: 0.95;
  margin: 0 0 16px;
}

.hero-sub { color: var(--neutral); font-size: 18px; margin-bottom: 32px; }

.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 16px 28px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  transition: background 200ms ease-out;
}

.btn:hover { background: var(--primary-hover); }

.section {
  max-width: 1440px;
  margin: 0 auto;
  padding: 32px max(16px, env(safe-area-inset-right)) 32px max(16px, env(safe-area-inset-left));
}

.section.compact { padding-top: 24px; padding-bottom: 24px; }
.section.compact h2 { font-size: 24px; margin-bottom: 12px; }

.home-section:first-of-type {
  padding-top: 48px;
}

.home-section h2 {
  font-size: 32px;
  margin: 0 0 24px;
}


.page-header {
  max-width: 1440px;
  margin: 0 auto;
  padding: 32px max(16px, env(safe-area-inset-right)) 16px max(16px, env(safe-area-inset-left));
}

.page-header h1 { font-size: 48px; margin: 0; }
.page-sub { color: var(--neutral); margin-top: 8px; }

.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 12px;
  margin: 32px 0 0;
}

.pagination-pages {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.pagination-link,
.pagination-current {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
  padding: 0 12px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
}

.pagination-link {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--primary);
  text-decoration: none;
}

button.pagination-link {
  cursor: pointer;
  font: inherit;
}

.pagination-link:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.pagination-link.disabled {
  opacity: 0.4;
  pointer-events: none;
}

.pagination-current {
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
}

.category-filters { margin-bottom: 12px; }
.category-filters .chip { font-weight: 600; }

.sort-filters { margin-bottom: 12px; }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.chip {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  min-height: 44px;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background 200ms ease-out, color 200ms ease-out;
  -webkit-appearance: none;
  appearance: none;
}

.chip:hover { border-color: var(--primary); }
.chip.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.book-card-wrap[hidden] { display: none; }

.book-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 12px;
}

.book-card {
  width: 100%;
  min-width: 0;
}

@media (min-width: 480px) {
  .book-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px 14px;
  }
}

@media (min-width: 768px) {
  .book-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 16px;
  }
}

@media (min-width: 1024px) {
  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    justify-content: start;
  }

  .book-card {
    max-width: 156px;
  }
}

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

.book-card-cover {
  display: block;
}

.book-card-title {
  display: inline;
}

.book-card-title:hover,
.book-card .meta a:hover {
  color: var(--neutral);
}

.book-card .meta a {
  text-decoration: none;
}

.book-card .meta a:hover {
  text-decoration: underline;
}

.cover-frame {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: var(--surface);
}

.cover-frame::before {
  content: "";
  display: block;
  padding-bottom: 150%;
}

.cover-frame .cover-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  object-position: center center;
  display: block;
}

.cover-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-start;
  padding: 8px;
  background: rgba(17, 17, 17, 0.9);
  color: #fff;
  opacity: 0;
  transition: opacity 200ms ease-out;
  pointer-events: none;
  overflow: hidden;
}

.cover-overlay-text {
  margin: 0;
  font-size: 11px;
  line-height: 1.32;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 14;
}

.book-card:hover .cover-overlay,
.book-card-cover:hover .cover-overlay,
.book-card:focus-within .cover-overlay {
  opacity: 1;
}

@media (hover: none) {
  .cover-overlay {
    display: none;
  }
}

.book-card h3 {
  font-size: 14px;
  margin: 10px 0 4px;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.book-card .meta {
  color: var(--neutral);
  font-size: 12px;
  margin: 0 0 2px;
  line-height: 1.35;
}

.link-list {
  list-style: none;
  padding: 0;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 max(16px, env(safe-area-inset-right)) 48px max(16px, env(safe-area-inset-left));
}

.link-list.wide { columns: 2; column-gap: 48px; }

.link-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  break-inside: avoid;
}

.link-list .count { color: var(--neutral); }

.section-link { margin-top: 24px; }
.section-link a { color: var(--neutral); }

.book-detail {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px max(16px, env(safe-area-inset-right)) 48px max(16px, env(safe-area-inset-left));
}

.book-detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 300px) 1fr;
  gap: 32px;
  align-items: start;
}

.cover-frame--large {
  max-width: 300px;
  margin: 0 auto;
}

.book-info h1 {
  font-size: 28px;
  margin-top: 0;
  overflow-wrap: anywhere;
}
.byline { font-size: 18px; }
.byline a { color: var(--neutral); }
.book-info .meta { color: var(--neutral); }
.summary { margin-top: 24px; color: var(--neutral); white-space: pre-line; }

.search-box {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 max(16px, env(safe-area-inset-right)) 24px max(16px, env(safe-area-inset-left));
}

.search-box input {
  width: 100%;
  background: var(--surface);
  border: none;
  border-radius: 8px;
  padding: 14px 16px;
  min-height: 48px;
  font-size: 16px;
  font-family: inherit;
  -webkit-appearance: none;
  appearance: none;
}

.search-box input:focus {
  outline: 2px solid var(--primary);
}

.search-results {
  list-style: none;
  padding: 0;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 max(16px, env(safe-area-inset-right)) 48px max(16px, env(safe-area-inset-left));
}

.search-results li {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.search-results a {
  text-decoration: none;
  display: block;
  padding: 4px 0;
}

.search-results .sub { color: var(--neutral); font-size: 14px; }

@media (min-width: 769px) {
  .section {
    padding-left: max(24px, env(safe-area-inset-left));
    padding-right: max(24px, env(safe-area-inset-right));
  }

  .page-header {
    padding: 48px max(24px, env(safe-area-inset-right)) 24px max(24px, env(safe-area-inset-left));
  }

  .page-header h1 {
    font-size: 48px;
  }

  .home-section h2 {
    font-size: 32px;
  }

  .book-detail {
    padding: 48px max(24px, env(safe-area-inset-right)) 48px max(24px, env(safe-area-inset-left));
  }

  .book-detail-grid {
    gap: 48px;
  }

  .cover-frame--large {
    margin: 0;
  }

  .book-info h1 {
    font-size: 36px;
  }
}

@media (max-width: 768px) {
  .site-nav {
    padding-top: env(safe-area-inset-top);
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--background);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    padding: 8px 0 max(12px, env(safe-area-inset-bottom));
    z-index: 101;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    margin: 0;
    padding: 12px max(16px, env(safe-area-inset-right)) 12px max(16px, env(safe-area-inset-left));
    border-bottom: 1px solid var(--border);
  }

  .nav-links a:last-child {
    border-bottom: none;
  }

  .hero h1 {
    font-size: 48px;
  }

  .page-header h1 {
    font-size: 32px;
  }

  .home-section h2 {
    font-size: 26px;
  }

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

  .cover-frame--large {
    max-width: min(280px, 72vw);
  }

  .link-list.wide {
    columns: 1;
  }

  .pagination-prev,
  .pagination-next {
    flex: 1 1 100%;
    justify-content: center;
  }
}