/* ---- CSS custom properties ---- */
:root {
  --bg-primary: #ebeced;
  --text-primary: #000;
  --text-secondary: #555;
  --border-color: #ddd;
  --link-color: #0066cc;
  --link-hover: #004499;
  --code-bg: #f5f5f5;
  --code-text: #333;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Playwrite GB J', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 1.05rem;
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

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

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

p {
  margin: 0 0 1em;
}

code {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
}

pre {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 12px;
  border-radius: 4px;
  overflow-x: auto;
}

pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
  font-size: 1em;
}

blockquote {
  border-left: 4px solid var(--border-color);
  margin-left: 0;
  padding-left: 1em;
  color: var(--text-secondary);
}

hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2em 0;
}

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

/* ---- Site header ---- */
.site-header {
  padding: 1.25rem 0 0.5rem;
  margin-bottom: 1.25rem;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  width: 100%;
  gap: 20px;
}

.header-content {
  flex: 1;
}

.site-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.site-title a {
  color: var(--text-primary);
  text-decoration: none;
}

.site-title a:hover {
  text-decoration: none;
  opacity: 0.75;
}

nav.nav {
  position: relative;
}

nav.nav a {
  color: var(--link-color);
  margin-right: 1.25em;
  font-size: 0.95rem;
}

nav.nav a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

nav.nav a.nav-link--center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

/* ---- Post list (home + section) ---- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list li {
  display: flex;
  align-items: baseline;
  gap: 1em;
  margin-bottom: 0.65em;
}

.post-date {
  color: var(--text-secondary);
  font-size: 0.9rem;
  white-space: nowrap;
  min-width: 7em;
}

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

.post-list a:hover {
  color: var(--link-color);
}

/* ---- Single post ---- */
article.latex-style {
  margin-top: 1.5rem;
}

article ul,
article ol {
  padding-left: 1.25em;
}


.post-header {
  margin-bottom: 2rem;
}

.post-title {
  font-size: 1.75rem;
  margin-top: 0;
}

.post-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

/* ---- Site footer ---- */
.site-footer {
  margin-top: 3rem;
  padding: 1.5rem 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* ---- Photos / gallery page ---- */
.gallery-page {
  margin-top: 0.5rem;
}

.gallery-intro {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.gallery-section {
  margin-bottom: 3px; /* same as inter-photo gap so sections run together */
}

.gallery-section-title {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 1.5rem 0 0.6rem;
}

/* The container that the JS justified-gallery writes inline widths/heights into */
.gallery-container {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  overflow: hidden; /* guard against sub-pixel rounding */
  opacity: 0;
  transition: opacity 0.2s ease;
}

.gallery-container.is-ready {
  opacity: 1;
}

.gal-fig {
  margin: 0;
  overflow: hidden;
  cursor: zoom-in;
  position: relative;
  /* Inline style sets the LQIP as background-image; these rules size it correctly. */
  background-color: var(--border-color);
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}

.gal-fig img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  /* Start transparent so the LQIP backdrop is visible while the image loads. */
  opacity: 0;
  transition: opacity 0.4s ease, filter 0.2s ease;
}

/* Image has finished loading (class added by JS). */
.gal-fig img.gal-img-loaded {
  opacity: 1;
}

.gal-fig:hover img.gal-img-loaded {
  filter: brightness(1.05);
}

.gal-fig figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.2rem 0.6rem 0.45rem;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.52));
  color: #fff;
  font-size: 0.75rem;
  line-height: 1.3;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.gal-fig:hover figcaption {
  opacity: 1;
}

/* ---- Gallery quote ---- */
.gallery-quote {
  margin: 3.5rem auto 1rem;
  max-width: 560px;
  text-align: center;
  border: none;
  padding: 0;
}

.gallery-quote-text {
  font-style: italic;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-primary);
  margin: 0 0 1rem;
}

.gallery-quote-text::before { content: '\201C'; }
.gallery-quote-text::after  { content: '\201D'; }

.gallery-quote-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  color: var(--text-secondary);
  font-size: 0.82rem;
}

.gallery-quote-author {
  font-style: normal;
  letter-spacing: 0.04em;
}

.gallery-quote-author::before { content: '— '; }

.gallery-quote-book {
  font-style: italic;
}

/* ---- Lightbox caption (PhotoSwipe registered UI element: name="caption") ---- */
/*
  Height must match the CAPTION_H constant in the PhotoSwipe paddingFn so the
  image viewport ends exactly where the caption strip begins.
*/
.pswp__caption {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(600px, calc(100vw - 120px)); /* 120px clears the prev/next arrow buttons */
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.82rem;
  text-align: center;
  pointer-events: none;
}