:root {
  --bg: #faf9f7;
  --text: #1a1a1a;
  --text-muted: #5a5a5a;
  --border: #e0ddd8;
  --accent: #0d5e5e;
  --accent-hover: #0a4a4a;
  --surface: #ffffff;
  --shadow: rgba(0, 0, 0, 0.08);
  --book-spine: #1a1a1a;
  --book-pages: #f5f0e8;
  --lines-top: #888989;
  --lines-bottom: #0d5e5e;
  --lines-art-width: 368px;
  --lines-art-height: 53px;
  --lines-center-width: 46px;
  --lines-grey-offset: 9px;
  --lines-grey-height: 9px;
  --lines-teal-offset: 23px;
  --lines-teal-height: 11px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #121212;
  --text: #e8e6e3;
  --text-muted: #a0a0a0;
  --border: #2e2e2e;
  --accent: #3d9a9a;
  --accent-hover: #5bb8b8;
  --surface: #1c1c1c;
  --shadow: rgba(0, 0, 0, 0.35);
  --book-spine: #0a0a0a;
  --book-pages: #d8d4cc;
  --lines-bottom: #ffffff;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Lora", Georgia, "Times New Roman", serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition:
    background-color var(--transition),
    color var(--transition);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-weight: 600;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition:
    color var(--transition),
    text-decoration-color var(--transition);
}

a:not(.btn):hover {
  text-decoration: underline;
}

a:hover {
  color: var(--accent-hover);
}

.btn:hover {
  text-decoration: none;
}

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

/* Header */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  transition: border-color var(--transition);
}

.site-nav {
  display: flex;
  gap: 1.25rem;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 1.125rem;
  font-weight: 700;
  text-decoration: none;
  transition:
    color var(--transition),
    text-decoration-color var(--transition);
}

.site-nav__icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

.site-nav a:hover:not([aria-current="page"]) {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.site-nav a[aria-current="page"],
.site-nav a[aria-current="page"]:hover {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 3px;
  text-underline-offset: 0.45em;
}

.site-nav a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.theme-switch {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  gap: 2px;
  transition:
    background-color var(--transition),
    border-color var(--transition);
}

.theme-switch__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    background-color var(--transition),
    color var(--transition);
}

:root:not([data-theme="dark"]) .theme-switch__btn[data-theme-value="light"],
[data-theme="dark"] .theme-switch__btn[data-theme-value="dark"] {
  background: var(--accent);
  color: #fff;
}

:root:not([data-theme="dark"]) .theme-switch__btn[data-theme-value="dark"]:hover,
[data-theme="dark"] .theme-switch__btn[data-theme-value="light"]:hover {
  color: var(--text);
}

.theme-switch__btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-switch__btn svg {
  width: 1.15rem;
  height: 1.15rem;
  display: block;
}

/* Main */

main {
  flex: 1;
  width: 100%;
  max-width: 52rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

/* Hero & intro */

.hero {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hero__logo {
  position: relative;
  width: min(280px, 80vw);
  margin: 0 auto 1.5rem;
  aspect-ratio: 703 / 626;
}

.hero__logo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.logo--dark {
  visibility: hidden;
  opacity: 0;
}

[data-theme="dark"] .logo--light {
  visibility: hidden;
  opacity: 0;
}

[data-theme="dark"] .logo--dark {
  visibility: visible;
  opacity: 1;
}

.intro {
  max-width: 42ch;
  margin: 0 auto;
  padding-bottom: 2.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.65;
  border-bottom: 1px solid var(--border);
  transition:
    color var(--transition),
    border-color var(--transition);
}

.catalog {
  padding-top: 3rem;
  margin-top: 0.5rem;
}

.intro ul {
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: left;
  display: inline-block;
}

.intro li {
  margin-bottom: 0.5rem;
  padding-left: 1.25rem;
  position: relative;
}

.intro li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Book list */

.book-list {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.book-card {
  display: grid;
  grid-template-columns: minmax(140px, 200px) 1fr;
  gap: 1.5rem 2rem;
  align-items: start;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  transition: border-color var(--transition);
}

.book-card:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.book-card__cover {
  display: flex;
  justify-content: center;
}

.book-card__cover-link {
  display: block;
  width: 100%;
  max-width: 200px;
  color: inherit;
  text-decoration: none;
}

.book-card__cover-link:hover {
  text-decoration: none;
}

.book-card__cover-img {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  box-shadow: 2px 4px 12px var(--shadow);
}

.book-card__title {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
  font-weight: 600;
}

.book-card__title a {
  color: inherit;
  transition: color var(--transition);
}

.book-card__title a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.book-card__subtitle,
.book-detail__subtitle {
  margin: 0 0 0.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-style: italic;
  transition: color var(--transition);
}

.book-detail__subtitle {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.book-card__author {
  margin: 0 0 0.75rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: color var(--transition);
}

.book-card__synopsis {
  margin: 0 0 1.25rem;
}

.book-card__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.book-actions__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  text-decoration: none;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition:
    background-color var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.btn__icon {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

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

/* 3D book */

.book-3d {
  --book-w: 140px;
  --book-h: calc(var(--book-w) * 3 / 2);
  --book-spine-ratio: 0.17;
  --book-depth: calc(var(--book-w) * var(--book-spine-ratio));
  --book-board-thickness: calc(var(--book-w) * 0.018);
  --book-page-inset: calc(var(--book-w) * 0.035);
  --book-pages-depth: calc(var(--book-depth) - (var(--book-board-thickness) * 2));
  --book-rotate-x: 6deg;
  --book-rotate-y: -28deg;
  perspective: 1200px;
  width: calc(var(--book-w) + var(--book-depth));
  height: calc(var(--book-h) + 24px);
  margin: 0 auto;
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.book-3d--lg {
  --book-w: 180px;
}

.book-detail .book-3d--lg {
  --book-w: 260px;
  perspective: 1400px;
}

.book-3d__body {
  position: relative;
  width: var(--book-w);
  height: var(--book-h);
  margin: 0 auto;
  transform-style: preserve-3d;
  transform: rotateY(var(--book-rotate-y)) rotateX(var(--book-rotate-x));
  transition: transform 0.25s ease;
}

.book-3d:hover .book-3d__body {
  transform: rotateY(-26deg) rotateX(5deg);
}

.book-3d__face {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  transform-style: preserve-3d;
  backface-visibility: visible;
  background: var(--surface);
}

.book-3d__face--front,
.book-3d__face--back {
  width: var(--book-w);
  height: var(--book-h);
  aspect-ratio: 2 / 3;
  box-shadow: 2px 4px 12px var(--shadow);
  transition: box-shadow var(--transition);
}

.book-3d__face--front {
  transform: translateZ(calc(var(--book-depth) / 2));
}

.book-3d__face--back {
  transform: rotateY(180deg) translateZ(calc(var(--book-depth) / 2));
}

.book-3d:hover .book-3d__face--front,
.book-3d:hover .book-3d__face--back {
  box-shadow: 4px 8px 20px var(--shadow);
}

.book-3d__face img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-3d__board {
  position: absolute;
  top: 0;
  left: 0;
  height: var(--book-h);
  overflow: visible;
  transform-style: preserve-3d;
}

.book-3d__board--front,
.book-3d__board--back {
  --board-width: var(--book-w);
  width: var(--book-w);
}

.book-3d__board--front {
  transform: translateZ(calc((var(--book-depth) - var(--book-board-thickness)) / 2));
}

.book-3d__board--back {
  transform: rotateY(180deg) translateZ(calc((var(--book-depth) - var(--book-board-thickness)) / 2));
}

.book-3d__board--spine {
  --board-width: var(--book-depth);
  width: var(--book-depth);
  transform: rotateY(-90deg) translateX(calc(var(--book-depth) / -2));
  transform-origin: left center;
}

.book-3d__board-face,
.book-3d__board-edge {
  position: absolute;
  overflow: hidden;
  backface-visibility: visible;
  background-image: var(--board-image);
  background-repeat: no-repeat;
  transform-style: preserve-3d;
}

.book-3d__board-face {
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: 100% 100%;
}

.book-3d__board-face--outer {
  transform: translateZ(calc(var(--book-board-thickness) / 2));
  box-shadow: 2px 4px 12px var(--shadow);
  transition: box-shadow var(--transition);
}

.book-3d__board-face--inner {
  transform: rotateY(180deg) translateZ(calc(var(--book-board-thickness) / 2));
  filter: brightness(0.72) saturate(0.85);
}

.book-3d:hover .book-3d__board-face--outer {
  box-shadow: 4px 8px 20px var(--shadow);
}

.book-3d__board-face img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-3d__board-edge {
  filter: brightness(0.8) saturate(0.9);
}

.book-3d__board-edge--top,
.book-3d__board-edge--bottom {
  left: 0;
  width: 100%;
  height: var(--book-board-thickness);
  background-size: 100% var(--book-h);
}

.book-3d__board-edge--top {
  top: 0;
  transform: rotateX(90deg) translateY(calc(var(--book-board-thickness) / -2));
  transform-origin: center top;
  background-position: top center;
}

.book-3d__board-edge--bottom {
  bottom: 0;
  transform: rotateX(-90deg) translateY(calc(var(--book-board-thickness) / 2));
  transform-origin: center bottom;
  background-position: bottom center;
}

.book-3d__board-edge--fore,
.book-3d__board-edge--hinge {
  top: 0;
  width: var(--book-board-thickness);
  height: 100%;
  background-size: var(--board-width) 100%;
}

.book-3d__board-edge--fore {
  right: 0;
  transform: rotateY(90deg) translateX(calc(var(--book-board-thickness) / 2));
  transform-origin: right center;
  background-position: right center;
}

.book-3d__board-edge--hinge {
  left: 0;
  transform: rotateY(-90deg) translateX(calc(var(--book-board-thickness) / -2));
  transform-origin: left center;
  background-position: left center;
}

.book-3d__face--spine {
  width: var(--book-depth);
  height: var(--book-h);
  transform: rotateY(-90deg) translateX(calc(var(--book-depth) / -2));
  transform-origin: left center;
}

.book-3d__face--pages {
  top: var(--book-page-inset);
  right: var(--book-page-inset);
  left: auto;
  width: var(--book-pages-depth);
  height: calc(var(--book-h) - (var(--book-page-inset) * 2));
  transform: rotateY(90deg) translateX(calc(var(--book-pages-depth) / 2));
  transform-origin: right center;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.18), transparent 24%, rgba(0, 0, 0, 0.08)),
    repeating-linear-gradient(
      90deg,
      var(--book-pages) 0,
      var(--book-pages) 2px,
      #e8e4dc 2px,
      #e8e4dc 4px
    );
  box-shadow: inset 2px 0 5px rgba(0, 0, 0, 0.12);
}

.book-3d__face--top {
  top: var(--book-page-inset);
  left: var(--book-page-inset);
  width: calc(var(--book-w) - (var(--book-page-inset) * 2));
  height: var(--book-pages-depth);
  transform-origin: center top;
  transform: rotateX(90deg) translateY(calc(var(--book-pages-depth) / -2));
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.14), transparent 30%, rgba(0, 0, 0, 0.08)),
    repeating-linear-gradient(
      0deg,
      var(--book-pages) 0,
      var(--book-pages) 2px,
      #e8e4dc 2px,
      #e8e4dc 4px
    );
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

.book-3d__face--bottom {
  top: auto;
  bottom: var(--book-page-inset);
  left: var(--book-page-inset);
  width: calc(var(--book-w) - (var(--book-page-inset) * 2));
  height: var(--book-pages-depth);
  transform-origin: center bottom;
  transform: rotateX(-90deg) translateY(calc(var(--book-pages-depth) / 2));
  background:
    linear-gradient(0deg, rgba(0, 0, 0, 0.14), transparent 30%, rgba(0, 0, 0, 0.08)),
    repeating-linear-gradient(
      0deg,
      var(--book-pages) 0,
      var(--book-pages) 2px,
      #e8e4dc 2px,
      #e8e4dc 4px
    );
  box-shadow: inset 0 -2px 5px rgba(0, 0, 0, 0.1);
}

@keyframes book-3d-spin {
  from {
    transform: rotateX(6deg) rotateY(0deg);
  }

  to {
    transform: rotateX(6deg) rotateY(360deg);
  }
}

.book-3d--spin .book-3d__body {
  animation: book-3d-spin 18s linear infinite;
}

.book-3d--hovering .book-3d__body {
  animation-play-state: paused;
}

.book-3d--controlled .book-3d__body,
.book-3d--controlled:hover .book-3d__body,
.book-3d--controlled:focus-within .book-3d__body {
  animation: none;
  transform: rotateY(var(--book-rotate-y)) rotateX(var(--book-rotate-x));
}

.book-3d--dragging {
  cursor: grabbing;
}

.book-3d--dragging .book-3d__body {
  transition: none;
}

.book-3d__shadow {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 80%;
  height: 12px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse, var(--shadow) 0%, transparent 70%);
  pointer-events: none;
}

/* Book detail page */

.book-detail {
  display: grid;
  grid-template-columns: minmax(260px, 320px) 1fr;
  gap: 2.5rem;
  align-items: start;
}

.book-detail__cover {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.book-detail__stats {
  width: 100%;
  max-width: 260px;
  font-size: 0.875rem;
  line-height: 1.4;
  border-collapse: collapse;
  background: transparent;
}

.book-detail__stats th,
.book-detail__stats td {
  padding: 0.4rem 0.65rem;
  font-weight: 400;
  text-align: left;
  vertical-align: top;
  background: transparent;
}

.book-detail__stats th {
  width: 55%;
  color: var(--text-muted);
}

.book-detail__stats td {
  color: var(--text);
  white-space: pre-line;
}

.book-detail__stats tr + tr th,
.book-detail__stats tr + tr td {
  border-top: 1px solid var(--border);
}

.book-detail__title {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

.book-detail__author {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.book-detail__description p {
  margin: 0 0 1rem;
}

.book-detail__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.not-found {
  text-align: center;
  padding: 3rem 0;
}

/* About */

.about h1 {
  margin-top: 0;
  font-size: 1.75rem;
}

.about h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
}

.about p {
  color: var(--text-muted);
  transition: color var(--transition);
}

/* Page lines: fixed centre V, extending bars fill to viewport edges */

.page-lines {
  display: flex;
  align-items: flex-end;
  width: 100%;
  max-width: 100%;
  height: var(--lines-art-height);
  margin-top: 2.5rem;
  line-height: 0;
}

.page-lines__side {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  height: 100%;
}

.page-lines__stripe--top {
  position: absolute;
  top: var(--lines-grey-offset);
  left: 0;
  right: 0;
  height: var(--lines-grey-height);
  background: var(--lines-top);
  transition: background-color var(--transition);
}

.page-lines__stripe--bottom {
  position: absolute;
  top: var(--lines-teal-offset);
  left: 0;
  right: 0;
  height: var(--lines-teal-height);
  background: var(--lines-bottom);
  transition: background-color var(--transition);
}

.page-lines__center {
  position: relative;
  flex: 0 0 auto;
  width: min(var(--lines-center-width), 100%);
  height: 100%;
  overflow: hidden;
}

.page-lines__img {
  position: absolute;
  top: 0;
  left: calc((var(--lines-art-width) - 100%) / -2);
  display: block;
  width: var(--lines-art-width);
  height: var(--lines-art-height);
  max-width: none;
}

.page-lines__img--dark {
  visibility: hidden;
  opacity: 0;
}

[data-theme="dark"] .page-lines__img--light {
  visibility: hidden;
  opacity: 0;
}

[data-theme="dark"] .page-lines__img--dark {
  visibility: visible;
  opacity: 1;
}

/* Footer */

.site-footer {
  text-align: center;
  padding: 1.25rem 1.5rem 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }

  .book-3d__body {
    transition: none;
  }

  .book-3d--spin .book-3d__body {
    animation: none;
    transform: rotateY(-28deg) rotateX(6deg);
  }
}

/* Responsive */

@media (max-width: 600px) {
  .book-card,
  .book-detail {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .book-card__actions,
  .book-detail__actions {
    align-items: center;
  }
}