/* ============================================
   TOKENS
   ============================================ */
:root {
  --color-bg:      #FAFAF7;
  --color-ink:     #16160F;
  --color-muted:   #6E6B61;
  --color-line:    #DEDCD2;
  --color-accent:  #3E5C4B;
  --color-accent-soft: #E4EAE4;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'Work Sans', -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, monospace;

  --measure: 640px;
  --gutter: clamp(24px, 6vw, 96px);
}

@media (prefers-color-scheme: dark) {
  /* Intentionally not switching to dark mode automatically —
     the warm paper background is core to the design. */
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ============================================
   TYPE
   ============================================ */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 0.4em;
}

h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 400; }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1.3em; max-width: var(--measure); }

em, i { font-family: var(--font-display); font-style: italic; }

a {
  color: var(--color-ink);
  text-decoration: none;
}

.page-content a,
.hero a,
.post-content a {
  background-image: linear-gradient(var(--color-accent), var(--color-accent));
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 100% 1px;
  padding-bottom: 1px;
  transition: background-size 0.2s ease;
}
.page-content a:hover,
.hero a:hover,
.post-content a:hover {
  background-size: 100% 2px;
}

.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 0.9em;
}

.text-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}
.text-link:hover { opacity: 0.7; }

/* ============================================
   NAV
   ============================================ */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px var(--gutter) 24px;
  border-bottom: 1px solid var(--color-line);
}

.site-nav__name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.site-nav__links {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  position: relative;
  padding-bottom: 4px;
}

.site-nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.site-nav__links a:hover,
.site-nav__links a.is-active {
  color: var(--color-ink);
}
.site-nav__links a:hover::after,
.site-nav__links a.is-active::after {
  transform: scaleX(1);
}

/* ============================================
   LAYOUT / MAIN
   ============================================ */
.site-main {
  max-width: 980px;
  margin: 0 auto;
  padding: clamp(56px, 9vw, 120px) var(--gutter) 40px;
}

/* Hero (homepage) */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(32px, 6vw, 72px);
  align-items: stretch;
}

.hero-photo {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-top: 60px;
}

.hero-photo img {
  width: 380px;
  height: 480px;
  object-fit: cover;
  border-radius: 4px;
  filter: saturate(0.92);
}

.hero-photo__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--color-muted);
  max-width: 380px;
}

@media (max-width: 760px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-photo {
    order: -1;
  }
  .hero-photo img {
    width: 100%;
    height: 220px;
  }
}

.hero {
  max-width: 700px;
  animation: rise 0.6s ease both;
}
.hero h1 { margin-bottom: 0.15em; }
.hero p:first-of-type { color: var(--color-muted); font-family: var(--font-mono); font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 2em; }

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.index-section {
  margin-top: clamp(64px, 10vw, 112px);
  padding-top: 40px;
  border-top: 1px solid var(--color-line);
}

/* Generic content pages */
.page-title { margin-bottom: 0.6em; }
.page-content { max-width: var(--measure); }
.page-content h2 {
  margin-top: 2.4em;
  padding-top: 1.2em;
  border-top: 1px solid var(--color-line);
}
.page-content ul { padding-left: 1.2em; }
.page-content li { margin-bottom: 0.4em; }

/* ============================================
   INDEX LISTS (journal + papers)
   ============================================ */
.index-list {
  list-style: none;
  margin: 0 0 1.5em;
  padding: 0;
}

.index-list__item {
  border-bottom: 1px solid var(--color-line);
}

.index-list__item a {
  display: flex;
  align-items: center;
  gap: clamp(16px, 4vw, 40px);
  padding: 18px 4px;
  background-image: none !important;
}

.index-list__thumb {
  width: 160px;
  height: 100px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
  filter: saturate(0.9);
  transition: filter 0.2s ease, transform 0.2s ease;
}

.index-list__item a:hover .index-list__thumb {
  filter: saturate(1.05);
  transform: scale(1.02);
}

.index-list__body {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.index-list__date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-muted);
  min-width: 88px;
  flex-shrink: 0;
}

.index-list__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  transition: color 0.2s ease, transform 0.2s ease;
}

.index-list__item a:hover .index-list__title {
  color: var(--color-accent);
  transform: translateX(4px);
}

.index-list__excerpt {
  display: block;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--color-muted);
  margin-top: 4px;
}

/* ============================================
   PUBLICATIONS
   ============================================ */
.pub-list { list-style: none; margin: 0; padding: 0; }
.pub-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-line);
}
.pub-item__title { font-family: var(--font-display); font-size: 1.15rem; margin-bottom: 0.3em; }
.pub-item__meta { font-family: var(--font-mono); font-size: 0.78rem; color: var(--color-muted); margin-bottom: 0.6em; }
.pub-item__abstract { font-size: 0.95rem; color: var(--color-muted); margin-bottom: 0.6em; }
.pub-item__links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  margin-right: 16px;
  color: var(--color-accent);
}

/* ============================================
   POST
   ============================================ */
.post { max-width: var(--measure); margin: 0 auto; }
.post-header { margin-bottom: 2em; }
.post-title { margin-top: 0.2em; }
.post-header-image {
  width: 100%;
  max-height: 460px;
  object-fit: cover;
  margin: 0 0 2.5em;
}

.post-lang-switch {
  display: flex;
  gap: 8px;
  margin-top: 0.8em;
}

.post-lang-switch__item {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--color-line);
  color: var(--color-muted);
}

a.post-lang-switch__item:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.post-lang-switch__item.is-active {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-bg);
}
.post-content { font-size: 1.05rem; }
.post-content h2 { margin-top: 1.8em; }
.post-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.8em 0;
}
.post-content figcaption,
.post-content img + em {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-top: -1.2em;
  margin-bottom: 1.8em;
}
.post-footer {
  margin-top: 3em;
  padding-top: 1.5em;
  border-top: 1px solid var(--color-line);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding: 56px var(--gutter) 32px;
  margin-top: 80px;
}

.site-footer__row {
  display: flex;
  gap: clamp(48px, 10vw, 120px);
  margin-bottom: 48px;
}

.site-footer__block ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__block li { margin-bottom: 6px; }

.site-footer__block a {
  font-size: 0.92rem;
  color: var(--color-muted);
}
.site-footer__block a:hover { color: var(--color-ink); }

.site-footer__base {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted);
  letter-spacing: 0.02em;
  flex-wrap: wrap;
  gap: 8px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 640px) {
  .site-nav { flex-direction: column; align-items: flex-start; gap: 14px; }
  .site-nav__links { flex-wrap: wrap; gap: 14px 20px; }
  .index-list__thumb { width: 64px; height: 64px; }
  .site-footer__row { flex-direction: column; gap: 32px; }
}

/* ============================================
   HIGHLIGHTING & COMMENTS
   ============================================ */
.highlight-popover {
  position: absolute;
  z-index: 50;
  transform: translateX(-50%);
  background: var(--color-ink);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: none;
  border-radius: 3px;
  padding: 8px 12px;
  cursor: pointer;
}
.highlight-popover:hover { opacity: 0.85; }

mark.heat-mark {
  border-radius: 2px;
  padding: 0 1px;
  cursor: default;
}

.comments-section {
  margin-top: 3.5em;
  padding-top: 2em;
  border-top: 1px solid var(--color-line);
}

.clap-widget {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 2.5em 0;
}

#clap-button {
  font-size: 1.5rem;
  line-height: 1;
  background: var(--color-accent-soft);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  width: 52px;
  height: 52px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}
#clap-button:hover { background: #d9e3da; }
#clap-button.is-clapped { transform: scale(1.15); }
#clap-button.is-maxed { opacity: 0.6; cursor: default; }

#clap-count {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-muted);
}

.share-widget {
  margin: 1.5em 0 2.5em;
}

.share-widget__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 0.3em;
}

.share-btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--color-ink);
  background: none;
  border: none;
  padding: 0 0 2px;
  cursor: pointer;
  border-bottom: 1px solid var(--color-line);
  transition: border-color 0.2s ease, color 0.2s ease;
}
.share-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.share-btn--native {
  font-weight: 500;
}
/* ============================================
   ACCESSIBILITY
   ============================================ */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}