:root {
  --bg: #fffdfb;
  --bg-alt: #fdf1e7;
  --text: #241d19;
  --text-muted: #6a5d54;
  --accent: #c2571a;
  --accent-fill: #e8892f;
  --accent-soft: #fbe4d3;
  --card: #fdf6f0;
  --border: #f0dccb;
  --serif: 'Lora', Georgia, serif;
  --sans: 'Karla', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 880px;
}

[data-theme="dark"] {
  --bg: #171515;
  --bg-alt: #201d1c;
  --text: #f0ece8;
  --text-muted: #b0a9a3;
  --accent: #f0a061;
  --accent-fill: #e8892f;
  --accent-soft: #33271f;
  --card: #262320;
  --border: #38342f;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.65;
  font-size: 16px;
  transition: background 0.2s ease, color 0.2s ease;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
}

/* Theme toggle */
#theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}
#theme-toggle svg { width: 18px; height: 18px; }
#icon-moon { display: none; }
[data-theme="dark"] #icon-sun { display: none; }
[data-theme="dark"] #icon-moon { display: block; }

/* Hero */
.hero {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 2.5rem;
}

.hero-text {
  flex: 1 1 auto;
  min-width: 0;
}

.hero-text h1 {
  font-family: var(--serif);
  font-size: 2.1rem;
  margin: 0 0 0.25rem;
}

.blog-header {
  margin-bottom: 2.5rem;
}
.blog-header h1 {
  font-family: var(--serif);
  font-size: 2.1rem;
  margin: 0 0 0.25rem;
}
.blog-header h1 a {
  color: var(--text);
  text-decoration: none;
}
.blog-header h1 a:hover { color: var(--accent); }

.blog-link {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  vertical-align: middle;
  margin-left: 0.5rem;
}
.blog-link:hover { text-decoration: underline; }

.tagline {
  margin: 0 0 0.35rem;
  color: var(--text-muted);
  font-size: 1rem;
}

.intro {
  font-size: 0.95rem;
  margin: 0 0 1rem;
}
.intro a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.intro a:hover { text-decoration: underline; }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.9rem;
}

.hero-photo {
  flex: 0 0 auto;
}

.hero-photo img {
  width: 220px;
  height: 220px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--border);
  display: block;
}

.links a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}
.links a:hover { text-decoration: underline; }

/* Section nav */
.sections-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding: 0.75rem 0;
  margin-bottom: 2.5rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.sections-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.sections-nav a:hover { color: var(--accent); }

/* Sections */
section { margin-bottom: 3rem; }

h2 {
  font-family: var(--serif);
  font-size: 1.4rem;
  margin: 0 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent-fill);
  display: inline-block;
}

p { margin: 0 0 1rem; }

/* Publications */
.pub {
  display: flex;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.pub:last-child { border-bottom: none; }

.pub-thumb {
  flex: 0 0 auto;
  width: 128px;
  height: 85px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pub-thumb.placeholder {
  background: var(--bg-alt);
  border: 1px dashed var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.pub-thumb img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.pub-body h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  font-family: var(--serif);
}
.pub-authors, .pub-venue { margin: 0 0 0.3rem; font-size: 0.9rem; }
.pub-venue { color: var(--text-muted); font-style: italic; }
.pub-abstract { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0.5rem; }
.pub-links a { color: var(--accent); text-decoration: none; font-size: 0.85rem; font-weight: 600; }
.pub-links a:hover { text-decoration: underline; }

/* Blog */
.post {
  display: flex;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.post:last-child { border-bottom: none; }
.post-date {
  margin: 0 0 0.3rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.post h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  font-family: var(--serif);
}
.post h3 a {
  color: var(--text);
  text-decoration: none;
}
.post h3 a:hover { color: var(--accent); }
.post-excerpt {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.post-page {
  max-width: 700px;
  margin: 0 auto;
  counter-reset: figure;
}

.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
}
.back-link:hover { text-decoration: underline; }

.post-eyebrow {
  display: block;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.post-title {
  font-family: var(--serif);
  font-size: 2rem;
  letter-spacing: -0.01em;
  margin: 0 0 1.1rem;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 2rem;
}

.post-meta-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  flex: 0 0 auto;
  display: block;
}

.post-page .post-byline {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.post-page .post-date {
  margin: 0.15rem 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.post-toc {
  margin: 0 0 2.5rem;
  padding: 1.1rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
}

.post-toc-title {
  margin: 0 0 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.post-toc ol {
  margin: 0;
  padding: 0 0 0 1.1rem;
  font-size: 0.88rem;
  columns: 1;
}

.post-toc li { margin: 0.3rem 0; }

.post-toc a {
  color: var(--text);
  text-decoration: none;
}
.post-toc a:hover { color: var(--accent); text-decoration: underline; }

.post-page p:not(.post-byline):not(.post-date):not(.post-author-bio) {
  font-size: 1.08rem;
  line-height: 1.65;
}

.post-page h2 {
  font-size: 1.6rem;
  margin-top: 2.75rem;
}

.post-page h3 {
  font-family: var(--serif);
  font-size: 1.05rem;
  margin: 1.75rem 0 0.75rem;
}

.post-page blockquote {
  margin: 1.5rem 0;
  padding: 0.3rem 1.25rem;
  border-left: 3px solid var(--accent-fill);
  color: var(--text-muted);
  font-style: italic;
}
.post-page blockquote p:last-child { margin-bottom: 0; }

.post-page figure {
  margin: 2.5rem 0;
  counter-increment: figure;
}
.post-page .figure-card {
  padding: 1.25rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--accent-soft);
  box-shadow: 0 1px 3px rgba(194, 87, 26, 0.08);
}
[data-theme="dark"] .post-page .figure-card {
  background: #f4ebe4;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
}
.post-page figure img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
}
.post-page figcaption {
  margin-top: 0.7rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}
.post-page figcaption::before {
  content: "Figure " counter(figure) ". ";
  font-weight: 700;
  color: var(--accent);
}

.post-page .table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.post-page table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 420px;
}
.post-page th, .post-page td {
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
.post-page thead th {
  font-family: var(--sans);
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: var(--bg-alt);
}
.post-page td:last-child, .post-page th:last-child { text-align: right; }
.post-page tr:last-child td { border-bottom: none; }
.post-page tr.highlight td {
  color: var(--text);
  font-weight: 700;
  background: var(--accent-soft);
}

.post-author-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  margin: 3.5rem 0 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.post-author-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  flex: 0 0 auto;
  display: block;
}
.post-author-name {
  margin: 0 0 0.25rem;
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
}
.post-author-bio {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.post-author-bio a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.post-author-bio a:hover { text-decoration: underline; }

/* Reading progress bar */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--accent-fill);
  z-index: 20;
}

/* Back to top */
#back-to-top {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
#back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
#back-to-top:hover { color: var(--accent); border-color: var(--accent); }
#back-to-top svg { width: 18px; height: 18px; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding-top: 1.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 640px) {
  .hero { flex-direction: column-reverse; align-items: flex-start; text-align: left; }
  .hero-photo img { width: 140px; height: 140px; }
  .pub { flex-direction: column; }
  .pub-thumb { width: 100%; height: 96px; }
  .post { flex-direction: column; }
  .post-toc ol { columns: 1; }
  .post-author-card { flex-direction: column; }
}

.video-row-wrap { position: relative; margin: 1.5rem 0; }
.video-row {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding: 4px 0 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.video-card {
  position: relative;
  flex: 0 0 46%;
  margin: 0;
  background: #000;
  border-radius: 10px;
  overflow: hidden;
  scroll-snap-align: start;
}
.video-card video {
  width: 100%;
  display: block;
  aspect-ratio: 15 / 9;
  object-fit: cover;
  object-position: left;
  background: #000;
  filter: brightness(1.1);
  pointer-events: none;
}
.video-card figcaption {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  padding: 12px 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #fff;
  text-align: left;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.55);
  pointer-events: none;
}
.video-row-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
}
.video-row-btn:hover { background: var(--bg-alt); }
.video-row-btn:disabled { opacity: 0; pointer-events: none; }
.video-row-btn svg { width: 16px; height: 16px; }
.video-row-btn-left { left: -18px; }
.video-row-btn-right { right: -18px; }
@media (max-width: 620px) {
  .video-card { flex-basis: 85%; }
  .video-row-btn-left { left: 4px; }
  .video-row-btn-right { right: 4px; }
}