*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: #0c0c0c;
  color: #b8b8b8;
  font-family: Georgia, 'Times New Roman', Times, serif;
  line-height: 1.75;
  padding: 0 1.5rem;
}

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem 6rem;
}

/* ---- NAVIGATION ---- */

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 3rem;
  padding: 0.75rem;
  border: 1px solid #202020;
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.018);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.16);
}

.site-nav a {
  color: #787878;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.site-nav a:hover {
  color: #e3e3e3;
  transform: translateY(-1px);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  width: fit-content;
  margin-bottom: 1.2rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid #202020;
  border-radius: 0.55rem;
  background: rgba(255, 255, 255, 0.014);
  font-size: 0.82rem;
  color: #7a7a7a;
}

.breadcrumbs a {
  color: #7a7a7a;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.breadcrumbs a:hover {
  color: #d8d8d8;
  border-color: #4a4a4a;
}

.breadcrumbs span {
  margin: 0;
}

.breadcrumbs span[aria-hidden="true"] {
  color: #3d3d3d;
}

.brand-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 2.1rem;
  padding: 0 0.35rem;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #9a9a9a;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.4rem;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 2.1rem;
  padding: 0 0.78rem;
  border: 1px solid transparent;
  border-radius: 0.45rem;
  font-size: 0.82rem;
  background: rgba(255, 255, 255, 0.015);
}

.nav-links a[aria-current="page"] {
  color: #d8d8d8;
  border-color: #3a3a3a;
  background: rgba(255, 255, 255, 0.055);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.015);
}

.nav-links a:hover {
  border-color: #4a4a4a;
  background: rgba(255, 255, 255, 0.045);
}

/* ---- HEADER ---- */

header {
  margin-bottom: 3rem;
  padding-bottom: 2.4rem;
  border-bottom: 1px solid #1a1a1a;
}

header h1 {
  font-size: 2rem;
  font-weight: normal;
  color: #e0e0e0;
  margin-bottom: 0.3rem;
  letter-spacing: 0.01em;
  line-height: 1.2;
}

.series-subtitle {
  font-size: 0.88rem;
  color: #484848;
  margin-bottom: 1.6rem;
}

.series-description {
  font-size: 0.97rem;
  color: #9c9c9c;
  max-width: 640px;
  line-height: 1.82;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin-top: 1.6rem;
}

.profile-links a {
  font-size: 0.84rem;
  color: #787878;
  text-decoration: none;
  border-bottom: 1px solid #252525;
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.profile-links a:hover {
  color: #e3e3e3;
  border-color: #6f6f6f;
  transform: translateY(-1px);
}

a:focus-visible,
summary:focus-visible,
.expand-card:focus-visible {
  outline: 2px solid #8f8f8f;
  outline-offset: 4px;
}

header h1 {
  transition: color 0.18s ease, transform 0.18s ease;
}

header:hover h1 {
  color: #f7f7f7;
  transform: translateY(-1px);
}

.series-subtitle {
  transition: color 0.18s ease;
}

header:hover .series-subtitle {
  color: #bdbdbd;
}

/* ---- BOOKS ---- */

.books {
  display: flex;
  flex-direction: column;
}

.book {
  position: relative;
  display: grid;
  grid-template-columns: 160px 1fr;
  column-gap: 2.8rem;
  padding: 1.5rem 1.5rem;
  border: 1px solid transparent;
  border-bottom: 1px solid #181818;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.01);
  transition: transform 0.25s ease, background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  will-change: transform;
  content-visibility: auto;
  contain-intrinsic-size: 420px;
}

.book:hover {
  transform: translateY(-3px);
  background-color: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.28);
}

.book:hover .book-title {
  color: #f2f2f2;
}

.book:hover .book-abstract {
  color: #c0c0c0;
}

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

.book-cover {
  position: relative;
  overflow: hidden;
  border-radius: 0.65rem;
}

.book-cover picture {
  display: block;
}

.book-cover img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  background: #151515;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.65);
}

.cover-buttons {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.85rem;
  justify-content: center;
}

.btn-outline {
  font-family: Georgia, 'Times New Roman', Times, serif;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #686868;
  text-decoration: none;
  border: 1px solid #2c2c2c;
  padding: 0.32rem 0.75rem;
  border-radius: 0.3rem;
  transition: color 0.20s ease, border-color 0.20s ease, transform 0.20s ease, background-color 0.20s ease, box-shadow 0.20s ease;
  display: inline-block;
  text-align: center;
}

.btn-outline:hover {
  color: #f5f5f5;
  border-color: #6c6c6c;
  background-color: rgba(255, 255, 255, 0.05);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.09);
  transform: translateY(-1px);
}

.book-num,
.book-year {
  transition: color 0.20s ease;
}

.book:hover .book-num,
.book:hover .book-year {
  color: #9f9f9f;
}

.book-title {
  transition: color 0.18s ease;
}

.reveal {
  transition: opacity 0.55s ease, transform 0.55s ease;
}

body.js-enabled .reveal {
  opacity: 0;
  transform: translateY(20px);
}

body.js-enabled .reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.book-num,
.book-year {
  font-size: 0.67rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #363636;
  margin-bottom: 0.65rem;
}

.book-title {
  font-size: 1.28rem;
  font-weight: normal;
  color: #d4d4d4;
  line-height: 1.35;
  margin-bottom: 1.2rem;
}

.book-title a,
.book-title a:link,
.book-title a:visited {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease;
}

.book-title a:hover {
  border-color: #4a4a4a;
}

.book-single {
  content-visibility: visible;
}

body.js-enabled.book-page .book-single.reveal {
  opacity: 1;
  transform: none;
}

.book-page .books {
  display: block;
}

.book-page .book {
  grid-template-columns: minmax(210px, 260px) minmax(0, 1fr);
  column-gap: 3.4rem;
  padding: 2.4rem;
  border: 1px solid #242424;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.022);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.24);
}

.book-page .book:hover {
  transform: none;
}

.book-page .book-cover {
  align-self: start;
}

.book-page .book-title {
  font-size: 1.52rem;
}

.book-page .book-abstract {
  font-size: 0.97rem;
  max-width: 680px;
}

.book-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 2rem;
}

.book-nav-link {
  min-height: 5rem;
  padding: 1rem;
  border: 1px solid #242424;
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.018);
  color: #b9b9b9;
  text-decoration: none;
  transition: transform 0.22s ease, background-color 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.book-nav-link:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 20px 46px rgba(0, 0, 0, 0.22);
}

.book-nav-kicker {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #515151;
}

.book-nav-link span:last-child {
  display: block;
  font-size: 0.88rem;
  line-height: 1.35;
}

.book-nav-all {
  text-align: center;
}

.page-back {
  margin-top: 1.4rem;
}

.page-back a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.1rem;
  padding: 0 0.9rem;
  border: 1px solid #2c2c2c;
  border-radius: 0.3rem;
  background: transparent;
  color: #686868;
  text-decoration: none;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color 0.20s ease, border-color 0.20s ease, background-color 0.20s ease, transform 0.20s ease, box-shadow 0.20s ease;
}

.page-back a:hover {
  color: #f5f5f5;
  border-color: #6c6c6c;
  background-color: rgba(255, 255, 255, 0.05);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.09);
  transform: translateY(-1px);
}

.book-abstract {
  font-size: 0.91rem;
  color: #909090;
  line-height: 1.8;
  margin-bottom: 1.9rem;
}

/* ---- LINKS ---- */

.book-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.book-cover .book-links {
  margin-top: 1.2rem;
}

.extra-links {
  margin-top: 0.1rem;
}

.extra-links summary {
  width: fit-content;
  cursor: pointer;
  list-style-position: outside;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: #686868;
  border-bottom: 1px solid #2a2a2a;
  padding-bottom: 2px;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.extra-links summary:hover,
.extra-links[open] summary,
.extra-links.hover-open summary {
  color: #a8a8a8;
  border-color: #545454;
}

.extra-links .link-row {
  margin-top: 0.55rem;
  gap: 0.28rem 0.72rem;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transform: translateY(-4px);
  transition: opacity 0.22s ease, transform 0.22s ease, max-height 0.22s ease;
}

.extra-links[open] .link-row {
  opacity: 1;
  max-height: 1000px;
  transform: translateY(0);
}

.extra-links .link-row a {
  font-size: 0.76rem;
  color: #666666;
}

.book-contents {
  margin-top: 2rem;
  padding-top: 1.35rem;
  border-top: 1px solid #262626;
}

.book-contents h3 {
  margin: 0 0 1rem;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #b8b8b8;
}

.contents-list {
  display: grid;
  gap: 0.72rem;
  margin: 0;
  padding-left: 1.2rem;
  color: #555555;
}

.contents-list li {
  padding-left: 0.25rem;
}

.contents-afterword {
  margin: 0.9rem 0 0 1.2rem;
}

.contents-chapter {
  display: block;
  color: #c8c8c8;
  font-size: 0.88rem;
  line-height: 1.45;
}

.contents-desc {
  display: block;
  margin-top: 0.12rem;
  color: #858585;
  font-size: 0.82rem;
  line-height: 1.65;
}

.home-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  min-height: 8.6rem;
  margin-top: 2rem;
  align-items: start;
}

.home-card {
  margin: 2rem 0 0;
  padding: 1.5rem 1.5rem;
  border: 1px solid #242424;
  border-radius: 1rem;
  background: rgba(255,255,255,0.02);
  color: #c9c9c9;
  display: block;
  text-decoration: none;
  transition: transform 0.25s ease, background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.home-tabs .home-card {
  display: flex;
  flex-direction: column;
  min-height: 3.75rem;
  height: 3.75rem;
  margin-top: 0;
  padding: 1rem;
  text-align: left;
}

.terms-card,
.more-books-card {
  justify-content: center;
}

.expand-card {
  cursor: default;
  overflow: visible;
  transition: height 0.22s ease, transform 0.25s ease, background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

a.expand-card {
  cursor: pointer;
}

.expand-card:hover,
.expand-card:focus,
.expand-card:focus-within {
  height: 8.25rem;
}

.home-card:hover {
  transform: translateY(-3px);
  background-color: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.28);
}

.home-card .card-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
  min-height: 1.75rem;
  margin-bottom: 0;
}

.home-card .card-head:last-child {
  margin-bottom: 0;
}

.home-card .more-label {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #7a7a7a;
  transition: color 0.18s ease;
}

.home-card:hover .more-label {
  color: #ffffff;
}


.download-all-card {
  display: flex;
  flex-direction: column;
  padding: 1rem;
}

.archive-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 0.45rem;
}

.download-all-card .btn-outline {
  min-width: 7rem;
}

.expand-content {
  max-height: 0;
  margin-top: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  transform: translateY(-4px);
  transition: max-height 0.22s ease, margin-top 0.22s ease, opacity 0.18s ease, transform 0.18s ease;
}

.expand-card:hover .expand-content,
.expand-card:focus .expand-content,
.expand-card:focus-within .expand-content {
  max-height: 6rem;
  margin-top: 0.9rem;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}


.home-tabs + footer {
  margin-top: 2.4rem;
}

.link-label {
  font-size: 0.63rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #363636;
  margin-bottom: 0.5rem;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
}

.link-row a {
  font-size: 0.84rem;
  color: #787878;
  text-decoration: none;
  border-bottom: 1px solid #252525;
  padding-bottom: 1px;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.link-row a:hover {
  color: #c4c4c4;
  border-color: #505050;
}

/* ---- FOOTER ---- */

footer {
  margin-top: 5.5rem;
  padding-top: 2rem;
  border-top: 1px solid #1a1a1a;
  font-size: 0.84rem;
  color: #525252;
}

footer a {
  color: #6e6e6e;
  text-decoration: none;
  border-bottom: 1px solid #252525;
  padding-bottom: 1px;
  transition: color 0.15s ease;
}

footer a:hover {
  color: #b0b0b0;
}

/* ---- TERMS ---- */

.terms-page h2 {
  color: #e0e0e0;
  line-height: 1.25;
  font-weight: normal;
  margin: 2.6rem 0 1.2rem;
  border-bottom: 1px solid #1a1a1a;
  padding-bottom: 0.65rem;
  font-size: 1.25rem;
}

.term {
  margin-bottom: 1rem;
  padding: 1.25rem 1.35rem;
  border: 1px solid #242424;
  border-radius: 0.65rem;
  background: rgba(255, 255, 255, 0.018);
  transition: background-color 0.20s ease, border-color 0.20s ease, transform 0.20s ease, box-shadow 0.20s ease;
}

.term:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.11);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.22);
  transform: translateY(-1px);
}

.term-title {
  color: #d8d8d8;
  font-weight: normal;
  font-size: 1.08rem;
  margin-bottom: 0.45rem;
}

.term p {
  color: #9b9b9b;
  font-size: 0.96rem;
  line-height: 1.76;
  margin-bottom: 0;
}

/* ---- RESPONSIVE ---- */

@media (max-width: 580px) {
  html {
    font-size: 16px;
  }

  .wrap {
    padding: 0.5rem 1rem 4.5rem;
  }

  .site-nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.9rem;
    margin-bottom: 2.4rem;
    padding: 0.85rem;
  }

  .nav-links {
    justify-content: flex-start;
    width: 100%;
  }

  .nav-links a {
    flex: 1 1 auto;
    justify-content: center;
  }

  header {
    margin-bottom: 3.5rem;
  }

  .book {
    grid-template-columns: 1fr;
    row-gap: 1.6rem;
    padding: 3.5rem 0;
  }

  .book-page .book {
    grid-template-columns: 1fr;
    padding: 1.5rem 0;
    border-right: none;
    border-left: none;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

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

  .book-nav-all {
    text-align: left;
  }

  .home-tabs {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .home-tabs .home-card {
    height: auto;
  }

  .expand-content {
    max-height: none;
    margin-top: 0.9rem;
    opacity: 1;
    overflow: visible;
    pointer-events: auto;
    transform: none;
  }

  .download-all-card .card-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .archive-links {
    justify-content: flex-start;
  }

  .book-cover img {
    width: 155px;
    max-width: 155px;
  }

  header h1 {
    font-size: 1.65rem;
  }

  .term {
    padding: 1.1rem 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    scroll-behavior: auto !important;
    transition: none !important;
  }
}