/*
 * Zihin Gezgini — Yerel tasarım çalışması / V2
 * Ana fikir: Yapay zekâ araç, analog olan öz.
 */

:root {
  --v2-bg: #eee8da;
  --v2-surface: #e5ddcd;
  --v2-surface-deep: #d8cebb;
  --v2-ink: #28231e;
  --v2-muted: #70685e;
  --v2-faint: #958c80;
  --v2-line: rgba(27, 26, 24, 0.17);
  --v2-accent: #8b5b38;
  --v2-accent-soft: rgba(139, 91, 56, 0.12);
  --v2-dark-panel: #1d1c19;
  --v2-dark-ink: #eee9df;
  --v2-page: 1180px;
  --v2-reading: 720px;
  --v2-radius: 2px;
  --v2-serif: 'Lora', Georgia, serif;
  --v2-display: 'Playfair Display', Georgia, serif;
  --v2-sans: 'Inter', system-ui, sans-serif;
}

body.dark-theme {
  --v2-bg: #151512;
  --v2-surface: #1d1d19;
  --v2-surface-deep: #26251f;
  --v2-ink: #ece7dd;
  --v2-muted: #aaa398;
  --v2-faint: #777268;
  --v2-line: rgba(236, 231, 221, 0.15);
  --v2-accent: #c18a5e;
  --v2-accent-soft: rgba(193, 138, 94, 0.12);
  --v2-dark-panel: #0e0f0d;
  --v2-dark-ink: #ece7dd;
}

html {
  scroll-behavior: smooth;
  background: #eee8da;
  color-scheme: light;
}

html.light-theme {
  background: #eee8da;
  color-scheme: light;
}

html.dark-theme {
  background: #151512;
  color-scheme: dark;
}

body {
  background-color: var(--v2-bg) !important;
  background-image: none !important;
  color: var(--v2-ink);
  font-family: var(--v2-serif);
  font-size: 17px;
  line-height: 1.7;
  transition: background-color 0.28s ease, color 0.28s ease;
}

.noscript-notice {
  margin: 0;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--v2-line);
  background: var(--v2-surface);
  color: var(--v2-muted);
  font: 500 0.75rem/1.6 var(--v2-sans);
  text-align: center;
}

.noscript-notice a {
  color: var(--v2-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

body:not(.dark-theme),
body:not(.dark-theme) .app-container,
body:not(.dark-theme) .content-view,
body:not(.dark-theme) .site-header,
body:not(.dark-theme) .site-footer {
  background-color: #eee8da !important;
  color: #28231e;
}

body.dark-theme,
body.dark-theme .app-container,
body.dark-theme .content-view,
body.dark-theme .site-header,
body.dark-theme .site-footer {
  background-color: #151512 !important;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 0, rgba(80, 62, 41, 0.025) 48%, transparent 100%),
    repeating-linear-gradient(0deg, transparent 0, transparent 3px, rgba(0, 0, 0, 0.012) 4px);
}

.paper-texture {
  opacity: 0.018;
  mix-blend-mode: multiply;
}

.app-container {
  max-width: var(--v2-page);
  padding: 0 32px 54px;
}

/* Header */
.site-header {
  position: relative;
  padding: 26px 0 22px;
  margin: 0 0 62px;
  border-bottom: 1px solid var(--v2-line);
  text-align: left;
}

.site-header::after {
  content: 'ZG / 01';
  position: absolute;
  right: 0;
  bottom: -25px;
  color: var(--v2-faint);
  font: 500 0.62rem/1 var(--v2-sans);
  letter-spacing: 0.17em;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  margin: 0;
  color: var(--v2-ink);
  flex: 0 0 auto;
}

.header-logo {
  width: 46px;
  height: 46px;
  filter: grayscale(1) contrast(1.08);
}

body.dark-theme .header-logo {
  filter: invert(0.92) grayscale(1) contrast(1.08);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-kicker {
  color: var(--v2-faint);
  font: 500 0.58rem/1.2 var(--v2-sans);
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.site-title {
  color: var(--v2-ink);
  font: 500 1.43rem/1.1 var(--v2-display);
  letter-spacing: -0.035em;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(14px, 2vw, 28px);
  font: 500 0.72rem/1 var(--v2-sans);
  letter-spacing: 0.06em;
  text-transform: none;
}

.nav-link {
  padding: 10px 0;
  color: var(--v2-muted);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--v2-ink);
}

.nav-link::after {
  bottom: 4px;
  background: var(--v2-accent);
}

.nav-link-random {
  color: var(--v2-accent);
}

.theme-toggle-btn {
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--v2-line);
  border-radius: 50%;
  color: var(--v2-ink);
  font-size: 0.85rem;
}

.theme-toggle-btn:hover {
  background: var(--v2-accent-soft);
  border-color: var(--v2-accent);
}

/* Home manifesto */
.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  align-items: center;
  gap: clamp(52px, 8vw, 112px);
  min-height: 560px;
  padding: 30px 0 68px;
}

.home-hero-copy {
  padding-bottom: 10px;
}

.hero-kicker,
.section-kicker {
  margin: 0 0 24px;
  color: var(--v2-accent);
  font: 600 0.65rem/1.2 var(--v2-sans);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.home-hero h2 {
  max-width: 760px;
  margin: 0;
  color: var(--v2-ink);
  font: 500 clamp(3.4rem, 7.2vw, 6.35rem)/0.95 var(--v2-display);
  letter-spacing: -0.058em;
}

.home-hero h2 em {
  color: var(--v2-accent);
  font-weight: 400;
}

.hero-lead {
  max-width: 610px;
  margin: 35px 0 0;
  color: var(--v2-muted);
  font-size: clamp(1rem, 1.4vw, 1.17rem);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 34px;
  font-family: var(--v2-sans);
  font-size: 0.78rem;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  min-width: 190px;
  padding: 12px 15px;
  border: 1px solid var(--v2-ink);
  color: var(--v2-ink);
}

.primary-link:hover {
  background: var(--v2-ink);
  color: var(--v2-bg);
}

.text-link {
  color: var(--v2-muted);
}

.text-link:hover {
  color: var(--v2-accent);
}

.home-hero-visual {
  position: relative;
  margin: 0;
  padding: 0 0 54px;
}

.hero-image-frame {
  position: relative;
  aspect-ratio: 3 / 4.35;
  overflow: hidden;
  background: var(--v2-surface-deep);
  border: 1px solid var(--v2-line);
}

.hero-image-frame::before {
  content: '';
  position: absolute;
  inset: 12px;
  z-index: 1;
  border: 1px solid rgba(255, 255, 255, 0.17);
  pointer-events: none;
}

.hero-image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: grayscale(0.58) sepia(0.12) contrast(1.08) brightness(0.84);
  opacity: 0.88;
  transform: scale(1.04);
}

body:not(.dark-theme) .hero-image-frame img {
  mix-blend-mode: multiply;
  filter: grayscale(0.58) sepia(0.12) contrast(1.05) brightness(1.02);
}

.home-hero-visual figcaption {
  position: absolute;
  right: -18px;
  bottom: 12px;
  padding: 12px 0 0 20px;
  border-left: 1px solid var(--v2-accent);
  color: var(--v2-muted);
  font: 500 0.65rem/1.55 var(--v2-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.archive-note {
  display: grid;
  grid-template-columns: 36px auto 1fr;
  align-items: center;
  gap: 18px;
  margin: 0 0 118px;
  padding: 22px 0;
  border-top: 1px solid var(--v2-line);
  border-bottom: 1px solid var(--v2-line);
}

.archive-note-mark,
.research-index {
  color: var(--v2-faint);
  font: 500 0.62rem/1 var(--v2-sans);
  letter-spacing: 0.12em;
}

.archive-note p {
  margin: 0;
  color: var(--v2-ink);
  font: italic 400 clamp(1.15rem, 2.2vw, 1.65rem)/1.4 var(--v2-display);
}

.archive-note-line {
  height: 1px;
  margin-left: 10px;
  background: linear-gradient(90deg, var(--v2-accent), transparent);
  opacity: 0.55;
}

/* Writing index */
.writing-index {
  margin-bottom: 130px;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 36px;
  margin-bottom: 38px;
}

.section-heading .section-kicker {
  margin-bottom: 10px;
}

.section-heading h2,
.research-copy h2 {
  margin: 0;
  color: var(--v2-ink);
  font: 500 clamp(2.25rem, 4.2vw, 4rem)/1.04 var(--v2-display);
  letter-spacing: -0.045em;
}

.search-container {
  width: 210px;
  max-width: none;
  margin: 0 0 4px;
}

#search-input {
  padding: 9px 30px 9px 0;
  border-bottom-color: var(--v2-line);
  color: var(--v2-ink);
  font-size: 0.72rem;
  text-align: left;
}

#search-input::placeholder {
  color: var(--v2-faint);
}

.search-submit-btn {
  right: 0;
  color: var(--v2-muted);
  font-size: 1.05rem;
}

.posts-filter {
  justify-content: flex-start;
  gap: 0;
  margin: 0 0 40px;
  border-top: 1px solid var(--v2-line);
  border-bottom: 1px solid var(--v2-line);
}

.filter-btn {
  padding: 13px 18px;
  border: 0;
  border-right: 1px solid var(--v2-line);
  border-radius: 0;
  color: var(--v2-muted);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
}

.filter-btn:first-child {
  padding-left: 0;
  padding-right: 24px;
}

.filter-btn:hover,
.filter-btn.active {
  background: transparent;
  color: var(--v2-accent);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 48px;
  border-top: 1px solid var(--v2-line);
}

.post-card {
  position: relative;
  min-height: 185px;
  padding: 26px 0 28px;
  border-bottom: 1px solid var(--v2-line);
  gap: 14px;
}

.post-card::after {
  content: '↗';
  position: absolute;
  right: 0;
  top: 26px;
  color: var(--v2-faint);
  font: 400 0.8rem/1 var(--v2-sans);
  transition: transform 0.25s ease, color 0.25s ease;
}

.post-card:hover::after {
  color: var(--v2-accent);
  transform: translate(3px, -3px);
}

.card-content {
  justify-content: space-between;
  height: 100%;
  gap: 12px;
  padding-right: 30px;
}

.card-category {
  color: var(--v2-accent);
  font-size: 0.61rem;
  letter-spacing: 0.14em;
}

.card-title {
  max-width: 92%;
  color: var(--v2-ink);
  font: 500 clamp(1.35rem, 2.4vw, 1.95rem)/1.18 var(--v2-display);
  letter-spacing: -0.025em;
}

.card-date {
  color: var(--v2-faint);
  font-size: 0.66rem;
  letter-spacing: 0.05em;
}

.post-card--featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  gap: 46px;
  min-height: 360px;
  padding: 0 0 42px;
}

.post-card--featured::after {
  top: 28px;
}

.post-card--featured .card-img-container {
  display: block;
  min-height: 330px;
  overflow: hidden;
  background: transparent;
}

/*
 * The torn-paper illustrations are exported as square JPG files, so their
 * white outer canvas is part of the image rather than a real frame. On the
 * paper theme, multiply lets that white canvas take on the page colour while
 * preserving the drawing and the naturally worn paper edges.
 */
body:not(.dark-theme) .post-card--featured .card-img-container {
  background: transparent;
}

body:not(.dark-theme) .post-card--featured .card-img,
body:not(.dark-theme) .post-featured-img,
body:not(.dark-theme) .post-body img,
body:not(.dark-theme) .post-body figure img,
body:not(.dark-theme) .about-featured-img {
  mix-blend-mode: multiply;
}

.post-card--featured .card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.65) contrast(1.05);
  transition: transform 0.8s cubic-bezier(0.2, 0.7, 0.2, 1), filter 0.4s ease;
}

.post-card--featured:hover .card-img {
  transform: scale(1.025);
  filter: grayscale(0.48) sepia(0.08) contrast(1.04);
}

.post-card--featured .card-content {
  justify-content: center;
  padding: 48px 48px 32px 0;
}

.post-card--featured .card-title {
  max-width: 100%;
  font-size: clamp(2rem, 4vw, 3.55rem);
  line-height: 1.04;
}

.load-more-container {
  margin-top: 42px;
}

.load-more-btn {
  padding: 12px 28px;
  border: 1px solid var(--v2-line);
  border-radius: 0;
  background: transparent;
  color: var(--v2-muted);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}

.load-more-btn:hover {
  background: var(--v2-ink);
  border-color: var(--v2-ink);
  color: var(--v2-bg);
  box-shadow: none;
}

/* Research area: deliberately distinct from original work */
.research-door {
  position: relative;
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr) 170px;
  gap: 36px;
  align-items: start;
  overflow: hidden;
  margin: 0 -32px 70px;
  padding: 84px 72px 88px;
  background: var(--v2-dark-panel);
  color: var(--v2-dark-ink);
}

.research-door::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(120deg, transparent 62%, rgba(255, 255, 255, 0.035) 62.2%, transparent 62.5%),
    repeating-linear-gradient(0deg, transparent 0 7px, rgba(255, 255, 255, 0.012) 8px);
}

.research-index {
  position: relative;
  padding-top: 9px;
  color: #817b70;
}

.research-copy {
  position: relative;
  max-width: 720px;
}

.research-copy .section-kicker {
  margin-bottom: 18px;
  color: #b58a66;
}

.research-copy h2 {
  color: var(--v2-dark-ink);
}

.research-copy > p:not(.section-kicker) {
  max-width: 660px;
  margin: 30px 0 0;
  color: #aaa499;
  font-size: 0.97rem;
  line-height: 1.85;
}

.research-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin-top: 34px;
  font: 500 0.72rem/1.4 var(--v2-sans);
}

.research-links a {
  padding-bottom: 7px;
  border-bottom: 1px solid #625f58;
  color: #d7d0c4;
}

.research-links a:hover {
  border-color: #b58a66;
  color: #b58a66;
}

.research-stamp {
  position: relative;
  display: flex;
  width: 142px;
  height: 142px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-top: 28px;
  border: 1px solid #59564f;
  border-radius: 50%;
  color: #716d64;
  transform: rotate(8deg);
}

.research-stamp::before,
.research-stamp::after {
  content: '';
  position: absolute;
  left: 22px;
  right: 22px;
  height: 1px;
  background: #4e4b45;
}

.research-stamp::before { top: 34px; }
.research-stamp::after { bottom: 34px; }

.research-stamp span {
  font: 400 2.7rem/1 var(--v2-display);
}

.research-stamp small {
  font: 600 0.55rem/1 var(--v2-sans);
  letter-spacing: 0.3em;
}

/* Interior pages share the same editorial frame */
.about-container,
.roadmap-container,
.library-layout,
.summary-reader-container {
  max-width: 100%;
}

.about-title,
.roadmap-title,
.library-header h2 {
  color: var(--v2-ink);
  font-family: var(--v2-display);
  font-weight: 500;
  letter-spacing: -0.04em;
}

.about-title,
.roadmap-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

.library-header {
  max-width: 760px;
  margin: 0 auto 48px;
}

.library-header h2 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

.library-header p,
.roadmap-subtitle {
  color: var(--v2-muted);
}

.library-shelf-wrapper {
  border: 1px solid var(--v2-line);
  border-radius: 0;
  background: var(--v2-surface);
  box-shadow: none;
}

.bookshelf-grid {
  gap: 3.6rem 2.5rem !important;
}

.book-title {
  color: var(--v2-ink);
  font-family: var(--v2-display);
  font-size: 1.05rem;
  font-weight: 500;
}

.book-author {
  color: var(--v2-faint);
}

/* Article reading experience */
.post-detail {
  max-width: var(--v2-reading);
}

.post-detail-title {
  color: var(--v2-ink);
  font: 500 clamp(2.65rem, 6vw, 5rem)/1.02 var(--v2-display);
  letter-spacing: -0.05em;
}

.post-body {
  color: var(--v2-ink);
  font-size: 1.08rem;
  line-height: 1.9;
}

.post-body p {
  margin-bottom: 1.65em;
}

.post-body blockquote {
  margin: 2.5em -52px;
  padding: 10px 0 10px 42px;
  border-left: 2px solid var(--v2-accent);
  color: var(--v2-muted);
  font: italic 400 1.45rem/1.6 var(--v2-display);
}

.post-featured-img,
.post-body img,
.about-featured-img {
  border-radius: 0;
  filter: grayscale(0.58) sepia(0.12) saturate(0.88) contrast(1.04);
}

body.dark-theme .post-featured-img,
body.dark-theme .post-body img,
body.dark-theme .post-body figure img,
body.dark-theme .about-featured-img {
  filter: grayscale(0.68) sepia(0.1) brightness(0.78) contrast(1.1) !important;
  opacity: 0.92 !important;
}

.post-subscribe-section {
  border: 1px solid var(--v2-line);
  border-radius: 0;
  background: var(--v2-surface);
  box-shadow: none;
}

/* Footer */
.site-footer {
  margin-top: 110px;
  padding-top: 38px;
  border-color: var(--v2-line);
  color: var(--v2-faint);
}

.footer-quote-widget {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.footer-socials a {
  color: var(--v2-muted);
}

/* Zihin Odası */
.about-container {
  display: grid;
  grid-template-columns: minmax(250px, 0.68fr) minmax(0, 1.32fr);
  grid-template-areas:
    'image heading'
    'image content';
  gap: 0 72px;
  align-items: start;
}

.about-image-container {
  grid-area: image;
  position: sticky;
  top: 28px;
  margin: 0;
  overflow: hidden;
  background: transparent;
}

.about-featured-img {
  width: 100%;
  max-width: none;
  display: block;
  padding: 0 !important;
  border: 0;
  background: transparent !important;
  clip-path: inset(1.45%);
  transform: scale(1.03);
  transform-origin: center;
}

.about-featured-img:hover {
  transform: scale(1.03);
}

.about-header {
  grid-area: heading;
  margin: 24px 0 28px;
}

.about-content {
  grid-area: content;
  max-width: 680px;
  color: var(--v2-muted);
  font-size: 1.04rem;
  line-height: 1.9;
}

.about-content p:first-child {
  color: var(--v2-ink);
  font-size: 1.18rem;
}

.about-content blockquote {
  margin: 44px 0;
  padding: 22px 0 22px 30px;
  border-left: 2px solid var(--v2-accent);
  color: var(--v2-ink);
  font: italic 400 clamp(1.55rem, 3vw, 2.2rem)/1.4 var(--v2-display);
}

.about-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin-top: 48px;
  border-top: 1px solid var(--v2-line);
}

.about-link-btn,
.about-link-btn.youtube-btn,
.about-link-btn.substack-btn,
.about-link-btn.spotify-btn,
.about-link-btn.apple-btn,
.about-link-btn.instagram-btn {
  padding: 15px 12px 15px 0;
  border: 0;
  border-bottom: 1px solid var(--v2-line);
  border-radius: 0;
  background: transparent;
  color: var(--v2-ink) !important;
  box-shadow: none;
  font-size: 0.72rem;
  text-align: left;
}

.about-link-btn:visited,
.about-link-btn.youtube-btn:visited,
.about-link-btn.substack-btn:visited,
.about-link-btn.spotify-btn:visited,
.about-link-btn.apple-btn:visited,
.about-link-btn.instagram-btn:visited {
  color: var(--v2-ink) !important;
}

.about-link-btn:hover,
.about-link-btn.youtube-btn:hover,
.about-link-btn.substack-btn:hover,
.about-link-btn.spotify-btn:hover,
.about-link-btn.apple-btn:hover,
.about-link-btn.instagram-btn:hover {
  border-color: var(--v2-accent);
  background: transparent;
  color: var(--v2-accent) !important;
  box-shadow: none;
  transform: none;
}

/* Okuma Haritası — a research notebook rather than a product dashboard */
.roadmap-container {
  padding-top: 18px;
}

.roadmap-header {
  margin-bottom: 56px;
}

.roadmap-title-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.55fr);
  gap: 48px;
  align-items: end;
}

.roadmap-title-group {
  max-width: 720px;
}

.roadmap-subtitle {
  max-width: 650px;
  margin-top: 18px;
  font-size: 0.96rem;
  line-height: 1.75;
}

.roadmap-quick-nav {
  justify-content: flex-end;
}

.quick-nav-pill {
  border: 1px solid var(--v2-line);
  border-radius: 0;
  background: transparent;
  color: var(--v2-muted);
  box-shadow: none;
}

.quick-nav-pill:hover,
.quick-nav-pill.has-started {
  border-color: var(--v2-accent);
  background: var(--v2-accent-soft);
  color: var(--v2-ink);
}

.roadmap-stats {
  margin: 38px 0 0;
  padding: 18px 0;
  border: 0;
  border-top: 1px solid var(--v2-line);
  border-bottom: 1px solid var(--v2-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.stats-progress-bar {
  height: 3px;
  border-radius: 0;
  background: var(--v2-surface-deep);
}

.stats-progress-fill {
  border-radius: 0;
  background: var(--v2-accent);
}

.featured-summaries-section {
  margin: 0 0 70px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.featured-summaries-title {
  color: var(--v2-ink);
  font: 500 1.8rem/1.2 var(--v2-display);
}

.featured-summaries-subtitle,
.featured-row-desc {
  color: var(--v2-muted);
}

.featured-summary-row {
  border: 0;
  border-top: 1px solid var(--v2-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.featured-summary-row:last-child {
  border-bottom: 1px solid var(--v2-line);
}

.featured-summary-row:hover {
  border-color: var(--v2-accent);
  background: var(--v2-accent-soft);
  box-shadow: none;
  transform: none;
}

.roadmap-books-list {
  border-top: 1px solid var(--v2-line);
}

.book-item-row {
  border: 0;
  border-bottom: 1px solid var(--v2-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.book-item-row:hover {
  background: var(--v2-accent-soft);
}

.book-item-row.is-expanded {
  background: var(--v2-surface);
  box-shadow: none;
}

.book-details-expanded,
.book-desc {
  color: var(--v2-muted);
}

.book-summary-btn,
.guide-info-trigger {
  border-color: var(--v2-line);
  border-radius: 0;
  background: transparent;
  color: var(--v2-accent);
}

.guide-info-trigger {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-left: 8px;
  padding: 2px 0 3px;
  border: 0;
  border-bottom: 1px solid var(--v2-line);
  color: var(--v2-accent);
  font: 600 0.68rem/1.2 var(--v2-sans);
  letter-spacing: 0.03em;
  text-decoration: none;
}

.guide-info-trigger span {
  display: inline-grid;
  width: 17px;
  height: 17px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font: italic 600 0.62rem/1 var(--v2-serif);
}

.guide-info-trigger:hover {
  border-color: var(--v2-accent);
  color: var(--v2-ink);
  opacity: 1;
}

.guide-modal-backdrop {
  background: rgba(12, 11, 9, 0.78);
  backdrop-filter: blur(9px) saturate(0.55);
}

body:not(.dark-theme) .guide-modal-backdrop {
  background: rgba(58, 50, 41, 0.46);
}

.guide-modal-content {
  width: min(92%, 660px);
  max-width: 660px;
  max-height: min(84vh, 760px);
  padding: 52px 56px 48px;
  border: 1px solid var(--v2-line);
  border-radius: 0;
  background: var(--v2-surface);
  color: var(--v2-ink);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.38);
  transform: translateY(18px) scale(0.985);
  transition: transform 0.32s cubic-bezier(0.2, 0.75, 0.2, 1), opacity 0.25s ease;
}

.guide-info-modal.is-active .guide-modal-content {
  transform: translateY(0) scale(1);
}

.guide-modal-content::before {
  content: '';
  position: absolute;
  inset: 12px;
  border: 1px solid var(--v2-line);
  pointer-events: none;
  opacity: 0.55;
}

.guide-modal-kicker {
  position: relative;
  margin: 0 0 13px;
  color: var(--v2-accent);
  font: 600 0.61rem/1.2 var(--v2-sans);
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.guide-modal-title {
  position: relative;
  margin: 0 44px 31px 0;
  padding: 0 0 25px;
  border-bottom: 1px solid var(--v2-line);
  color: var(--v2-ink);
  font: 500 clamp(2rem, 4.8vw, 3.1rem)/1.05 var(--v2-display);
  letter-spacing: -0.04em;
}

.guide-modal-body {
  position: relative;
}

.guide-modal-body p {
  margin: 0;
  padding: 17px 0;
  border-bottom: 1px solid var(--v2-line);
  color: var(--v2-muted);
  font: 400 0.9rem/1.72 var(--v2-serif);
}

.guide-modal-body p:first-child {
  padding-top: 0;
}

.guide-modal-body p:last-child {
  margin: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.guide-modal-body p strong {
  display: block;
  margin-bottom: 3px;
  color: var(--v2-ink);
  font-family: var(--v2-sans);
  font-size: 0.69rem;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

.guide-modal-close {
  top: 27px;
  right: 31px;
  z-index: 2;
  width: 34px;
  height: 34px;
  border: 1px solid var(--v2-line);
  border-radius: 50%;
  color: var(--v2-muted);
  font: 300 1.2rem/1 var(--v2-sans);
}

.guide-modal-close:hover {
  border-color: var(--v2-accent);
  color: var(--v2-accent);
}

body:not(.dark-theme) .reader-sidebar {
  background: var(--v2-surface) !important;
}

body.dark-theme .reader-sidebar {
  background: #1b1a17 !important;
}

/* Summary reader */
.summary-reader-container {
  padding-top: 18px;
}

.summary-hero-split {
  gap: clamp(38px, 7vw, 90px);
}

.summary-book-title {
  color: var(--v2-ink);
  font: 500 clamp(2.6rem, 5.6vw, 5rem)/1.02 var(--v2-display);
  letter-spacing: -0.045em;
}

.summary-featured-image-container,
.summary-featured-img {
  border-radius: 0;
}

.summary-featured-img {
  filter: grayscale(1) contrast(1.05);
}

.summary-book-meta-box,
.summary-intro-box,
.reader-chapter-section {
  border-color: var(--v2-line);
  border-radius: 0;
  background: var(--v2-surface);
  box-shadow: none;
}

.reader-chapter-title {
  color: var(--v2-ink);
  font-family: var(--v2-display);
  font-weight: 500;
}

/* Research library */
.library-layout {
  padding-top: 18px;
}

.library-header p {
  max-width: 690px;
  margin: 18px auto 0;
  line-height: 1.75;
}

.book-cover-img {
  filter: saturate(0.72) contrast(1.03);
}

.book-card:hover .book-cover-img {
  filter: saturate(0.92) contrast(1.04);
}

.reader-modal-content,
.reader-sidebar,
.reader-body {
  border-radius: 0;
}

.reader-modal-content {
  background: var(--v2-bg);
}

.reader-sidebar {
  background: var(--v2-surface);
  border-color: var(--v2-line);
}

.reader-text-content {
  color: var(--v2-ink);
  font-family: var(--v2-serif);
}

@media (max-width: 980px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    gap: 22px;
  }

  .home-hero {
    grid-template-columns: minmax(0, 1.2fr) minmax(230px, 0.7fr);
    gap: 46px;
  }

  .research-door {
    grid-template-columns: 42px minmax(0, 1fr) 120px;
    padding: 72px 48px;
  }

  .research-stamp {
    width: 112px;
    height: 112px;
  }

  .about-container {
    gap: 0 42px;
  }

  .roadmap-title-row {
    display: block;
  }

  .roadmap-quick-nav {
    justify-content: flex-start;
    margin-top: 28px;
  }
}

@media (max-width: 760px) {
  .app-container {
    padding: 0 18px 36px;
  }

  .site-header {
    margin-bottom: 32px;
    padding: 18px 0 16px;
  }

  .header-inner {
    gap: 15px;
  }

  .header-logo {
    width: 40px;
    height: 40px;
  }

  .brand-kicker {
    font-size: 0.51rem;
  }

  .site-title {
    font-size: 1.22rem;
  }

  .site-nav {
    overflow-x: auto;
    gap: 18px;
    padding: 0 0 7px;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    font-size: 0.66rem;
  }

  .nav-link-random {
    display: none;
  }

  .theme-toggle-btn {
    flex: 0 0 28px;
    width: 28px;
    height: 28px;
  }

  .home-hero {
    display: block;
    min-height: 0;
    padding: 55px 0 46px;
  }

  .home-hero h2 {
    font-size: clamp(3.15rem, 15vw, 4.65rem);
  }

  .hero-lead {
    margin-top: 28px;
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
  }

  .home-hero-visual {
    width: 72%;
    margin: 58px 0 0 auto;
  }

  .home-hero-visual figcaption {
    right: auto;
    left: -54px;
  }

  .archive-note {
    grid-template-columns: 28px 1fr;
    margin-bottom: 82px;
  }

  .archive-note-line {
    display: none;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 24px;
  }

  .search-container {
    width: 100%;
  }

  .posts-filter {
    overflow-x: auto;
    flex-wrap: nowrap;
    justify-content: flex-start;
    scrollbar-width: none;
  }

  .posts-filter::-webkit-scrollbar {
    display: none;
  }

  .filter-btn {
    flex: 0 0 auto;
    padding: 12px 14px;
  }

  .filter-btn:first-child {
    padding-right: 18px;
  }

  .posts-grid {
    display: block;
  }

  .post-card {
    min-height: 150px;
  }

  .post-card--featured {
    display: block;
    min-height: 0;
    padding-bottom: 30px;
  }

  .post-card--featured .card-img-container {
    min-height: 0;
    aspect-ratio: 16 / 10;
    margin-bottom: 25px;
  }

  .post-card--featured .card-content {
    padding: 0 26px 0 0;
  }

  .post-card--featured .card-title {
    margin: 8px 0 14px;
    font-size: 2.2rem;
  }

  .writing-index {
    margin-bottom: 85px;
  }

  .research-door {
    display: block;
    margin: 0 -18px 40px;
    padding: 58px 26px 64px;
  }

  .research-index {
    margin-bottom: 24px;
  }

  .research-copy h2 br {
    display: none;
  }

  .research-links {
    align-items: flex-start;
    flex-direction: column;
  }

  .research-stamp {
    position: absolute;
    right: 20px;
    bottom: 20px;
    width: 82px;
    height: 82px;
    opacity: 0.55;
  }

  .research-stamp::before { top: 20px; }
  .research-stamp::after { bottom: 20px; }
  .research-stamp span { font-size: 1.85rem; }

  .post-body blockquote {
    margin-left: 0;
    margin-right: 0;
    padding-left: 24px;
  }

  .library-shelf-wrapper {
    padding: 2rem 1rem;
  }

  .bookshelf-grid {
    gap: 2.5rem 1rem !important;
  }

  .about-container {
    display: block;
  }

  .about-image-container {
    position: relative;
    top: auto;
    width: 68%;
    margin: 0 0 48px auto;
  }

  .about-header {
    margin-top: 0;
  }

  .about-links {
    grid-template-columns: 1fr;
  }

  .roadmap-title-row {
    display: block;
  }

  .roadmap-quick-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    justify-content: flex-start;
    padding-bottom: 8px;
  }

  .guide-modal-content {
    width: calc(100% - 24px);
    max-height: 90vh;
    padding: 44px 28px 34px;
  }

  .guide-modal-content::before {
    inset: 8px;
  }

  .guide-modal-title {
    margin-right: 32px;
    font-size: 2rem;
  }

  .guide-modal-close {
    top: 20px;
    right: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}