:root {
  color-scheme: light dark;
  --bg: #f5f5f5;
  --content-bg: #ffffff;
  --text: #111111;
  --accent: #1f1f1f;
  --accent-light: #4a4a4a;
  --border: #d9d9d9;
  --shadow: rgba(0, 0, 0, 0.12);
  font-size: 20px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  display: block;
  border-radius: 18px;
  filter: grayscale(100%);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.site-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0 1.5rem 2.5rem;
}

.site-header {
  padding-top: 2.5rem;
}

.site-header__inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.75rem;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  text-decoration: none;
}

.brand__title {
  font-family: "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1.9rem;
  font-weight: 600;
  color: var(--text);
}

.brand__tagline {
  margin: 0;
  font-size: 0.9rem;
  text-transform: uppercase;
  color: var(--accent-light);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav__item a {
  font-size: 0.85rem;
  text-transform: uppercase;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.main-nav__item a[aria-current="page"] {
  border-bottom-color: var(--accent);
}

.main-nav__item a:hover,
.main-nav__item a:focus {
  border-bottom-color: var(--accent-light);
}

.theme-toggle {
  border: none;
  background: transparent;
  color: var(--accent);
  padding: 0.2rem;
  font-size: 1rem;
  cursor: pointer;
  line-height: 1;
}

.theme-toggle:hover,
.theme-toggle:focus {
  color: var(--accent-light);
}

.site-main {
  flex: 1;
}

.page-section {
  max-width: 960px;
  margin: 3rem auto 0;
}

.page-section:first-of-type {
  margin-top: 2.5rem;
}

.hero {
  display: grid;
  gap: 2.5rem;
  align-items: center;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.hero__media {
  margin: 0;
}

.hero__media img {
  box-shadow: 0 25px 45px var(--shadow);
  border-radius: 22px;
}

.hero__body {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.hero__kicker {
  margin: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--accent-light);
}

.hero__title {
  margin: 0;
  font-family: "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 2.8rem;
  font-weight: 600;
}

.hero__lede {
  margin: 0;
  font-size: 1.05rem;
  max-width: 36ch;
  color: rgba(17, 17, 17, 0.75);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.4rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 500;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.button:hover,
.button:focus {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px var(--shadow);
}

.button--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--accent);
}

.button--ghost:hover,
.button--ghost:focus {
  border-color: var(--accent);
  box-shadow: none;
}

.rich-text h1,
.rich-text h2,
.rich-text h3 {
  font-family: "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 600;
  margin: 0 0 1.2rem;
}

.rich-text p {
  margin: 0 0 1rem;
}

.rich-text p:last-child {
  margin-bottom: 0;
}

.photo-grid {
  column-width: 360px;
  column-gap: 1.75rem;
  margin-top: 2rem;
}

.photo-card {
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  background: var(--content-bg);
  display: inline-block;
  width: 100%;
  margin: 0 0 1.75rem;
  break-inside: avoid;
}

.photo-card img {
  border-radius: 0;
  box-shadow: none;
}

.photo-card figcaption {
  padding: 1rem 1.1rem;
  font-size: 0.92rem;
  color: var(--accent-light);
}

.book-accordion {
  margin-top: 2rem;
  display: grid;
  gap: 0.85rem;
}

.book-category {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--content-bg);
  padding: 0;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.book-category[open] {
  border-color: var(--accent);
  box-shadow: 0 18px 35px var(--shadow);
}

.book-category summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.35rem;
  cursor: pointer;
  font-size: 1rem;
  text-transform: uppercase;
  font-weight: 600;
}

.book-category summary::-webkit-details-marker {
  display: none;
}

.book-category summary::after {
  content: "+";
  font-size: 1.2rem;
  line-height: 1;
  transition: transform 0.2s ease;
}

.book-category[open] summary::after {
  transform: rotate(45deg);
}

.book-list {
  columns: 1;
  column-gap: 2.2rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.book-category .book-list {
  padding: 0 1.35rem 1.5rem;
  margin-top: 0.75rem;
}

.book-list li {
  break-inside: avoid;
  margin-bottom: 0.6rem;
}

.book-list a {
  color: var(--text);
}

.site-footer {
  max-width: 960px;
  margin: 4rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.9rem;
  color: rgba(17, 17, 17, 0.65);
}

body.dark-mode {
  --bg: #101010;
  --content-bg: #181818;
  --text: #f2f2f2;
  --accent: #f0f0f0;
  --accent-light: #b4b4b4;
  --border: #2a2a2a;
  --shadow: rgba(0, 0, 0, 0.45);
}

body.dark-mode a {
  color: var(--accent);
}

body.dark-mode .hero__lede {
  color: rgba(242, 242, 242, 0.7);
}

body.dark-mode .button {
  color: var(--bg);
}

body.dark-mode .button--ghost {
  color: var(--accent);
  border-color: rgba(240, 240, 240, 0.4);
}

body.dark-mode .button--ghost:hover,
body.dark-mode .button--ghost:focus {
  border-color: var(--accent);
}

body.dark-mode .photo-card {
  background: #1a1a1a;
}

body.dark-mode .photo-card figcaption {
  color: rgba(242, 242, 242, 0.7);
}

body.dark-mode .book-list a {
  color: var(--accent);
}

body.dark-mode .site-footer {
  color: rgba(242, 242, 242, 0.65);
}

body.dark-mode .book-category {
  background: #181818;
  border-color: #2a2a2a;
}

body.dark-mode .book-category summary {
  color: var(--accent);
}

.hero--profile {
  grid-template-columns: 1fr;
}

.hero--profile .hero__media {
  max-width: 520px;
  margin: 0 auto 2rem;
}

.hero--profile .hero__body {
  align-items: center;
  text-align: center;
}

.hero--profile .rich-text {
  text-align: left;
  max-width: 640px;
}

@media (max-width: 720px) {
  .site-shell {
    padding: 0 1.25rem 2.5rem;
  }

  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }

  .main-nav {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 0.75rem;
  }

  .main-nav__list {
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .page-section {
    margin-top: 2.5rem;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .photo-grid {
    column-width: 320px;
    column-gap: 1.5rem;
  }
}

@media (min-width: 720px) {
  .book-list {
    columns: 2;
  }
}

@media (min-width: 1024px) {
  .book-list {
    columns: 3;
  }
}