/* ---------------------------------------------------------------------
   Gabriel Kasmi — personal academic site
   Minimal academic style: generous whitespace, restrained color, a serif
   for headings and a clean sans for body text. Light mode is the primary
   design target; dark mode follows prefers-color-scheme automatically.
   --------------------------------------------------------------------- */

:root {
  --color-bg: #ffffff;
  --color-bg-raised: #f4f4f5;
  --color-text: #18181b;
  --color-text-muted: #6b7280;
  --color-border: #e4e4e7;
  --color-link: #9c6209;
  --color-link-hover: #7a4d07;
  --color-accent: #9c6209;

  --font-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  --measure: 40rem;
  --measure-wide: 52rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0a0a0b;
    --color-bg-raised: #19191b;
    --color-text: #f4f4f5;
    --color-text-muted: #9ca3af;
    --color-border: #2c2c31;
    --color-link: #e8a33d;
    --color-link-hover: #f3ba66;
    --color-accent: #e8a33d;
  }
}

:root[data-theme="dark"] {
  --color-bg: #0a0a0b;
  --color-bg-raised: #19191b;
  --color-text: #f4f4f5;
  --color-text-muted: #9ca3af;
  --color-border: #2c2c31;
  --color-link: #e8a33d;
  --color-link-hover: #f3ba66;
  --color-accent: #e8a33d;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.wrapper {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-text);
  margin: 1.8em 0 0.5em;
}

h1 { font-size: 2rem; margin-top: 0; }
h2 { font-size: 1.45rem; padding-top: 0.4em; border-top: 1px solid var(--color-border); margin-top: 2.4em; }
h3 { font-size: 1.15rem; }
h4 { font-size: 1rem; font-style: italic; }

p, ul, ol, table, figure, details { max-width: var(--measure); }

p { margin: 0 0 1.1em; }

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 3px;
}
a:hover { color: var(--color-link-hover); text-decoration-color: currentColor; }

ul, ol { padding-left: 1.3em; margin: 0 0 1.1em; }
li { margin-bottom: 0.4em; }

strong { font-weight: 600; }
em { font-style: italic; }
u { text-decoration: underline; text-decoration-color: var(--color-border); }

blockquote {
  margin: 1.4em 0;
  padding: 0.2em 0 0.2em 1em;
  border-left: 3px solid var(--color-accent);
  color: var(--color-text-muted);
  max-width: var(--measure);
}

code, pre {
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--color-bg-raised);
  border-radius: 3px;
}
code { padding: 0.1em 0.35em; }
pre { padding: 1em; overflow-x: auto; }

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

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5em 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  font-size: 0.95em;
}
th, td {
  text-align: left;
  padding: 0.5em 0.7em;
  border-bottom: 1px solid var(--color-border);
}
th { font-family: var(--font-serif); font-weight: 600; }

/* ---- Header / nav --------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6em 1.6em;
  padding: 0.9em 20px;
  margin: 0 -20px;
  border-bottom: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
}

.site-brand {
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  text-decoration: none;
  line-height: 0;
}
.site-brand:hover { color: var(--color-link); }

.site-nav { display: flex; flex-wrap: wrap; gap: 1.6em; }
.site-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}
.site-nav a:hover, .site-nav a.active { color: var(--color-link); }

.site-main { padding: 2.4em 0 4em; }

/* ---- Footer ----------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.8em 0 3em;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}
.footer-note { margin: 0; }

/* ---- Home / hero ------------------------------------------------------ */

.hero {
  display: flex;
  gap: 1.6em;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 1.4em;
}
.hero-photo {
  width: 148px;
  height: 148px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
}
.hero-body h1 { margin: 0 0 0.15em; }
.hero-tagline {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin: 0 0 0.8em;
}
.hero-affiliation {
  font-size: 0.92em;
  font-weight: 400;
  color: var(--color-text-muted);
}
.hero-affiliation a { text-decoration: none; }
.hero-affiliation a:hover { text-decoration: underline; }

.icon-row { display: flex; flex-wrap: wrap; align-items: center; gap: 1em; margin: 0; }
.icon-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}
.icon-row a svg { width: 19px; height: 19px; }
.icon-row a:hover { color: var(--color-link); }
.icon-row a.cv-link { color: var(--color-text-muted); }
.icon-row a.cv-link:hover { color: var(--color-link); }

.bio-aside {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin: 1.2em 0 0;
}

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8em 1.6em;
  margin: 2em 0 0.4em;
  padding: 1.2em 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.section-nav a {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  text-decoration: none;
}

/* ---- Badges / cards ---------------------------------------------------- */

.badge-row { display: flex; flex-wrap: wrap; gap: 0.6em; margin: 1em 0; }
.badge-link {
  display: inline-block;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.3em 0.9em;
  text-decoration: none;
}
a.badge-link:hover { color: var(--color-link); border-color: var(--color-link); }
span.badge-link { cursor: default; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1.2em;
  margin: 1.4em 0;
  max-width: var(--measure-wide);
}
.stat-item {
  border-top: 2px solid var(--color-accent);
  padding-top: 0.5em;
}
.stat-value {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
}
.stat-label {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.project-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.4em 1.6em;
  margin: 1.6em 0;
  max-width: var(--measure-wide);
  background: var(--color-bg-raised);
}
.project-card.featured { border-color: var(--color-accent); border-width: 2px; }
.project-card p, .project-card ul { max-width: none; }

.project-card-visual { display: block; text-decoration: none; margin: 1em 0; }
.project-card-visual img { border-radius: 6px; border: 1px solid var(--color-border); }
.project-card-visual-caption {
  display: block;
  margin-top: 0.5em;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---- Project tiles ------------------------------------------------------ */

.project-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.4em;
  margin: 1.6em 0;
  max-width: var(--measure-wide);
}
.project-tile {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--color-bg-raised);
  text-decoration: none;
  color: var(--color-text);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.project-tile:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
  box-shadow: 0 8px 20px -12px color-mix(in srgb, var(--color-accent) 60%, transparent);
}
.project-tile img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border);
}
.project-tile-body { padding: 1em 1.2em 1.3em; }
.project-tile-body p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  max-width: none;
}
.project-tile-title {
  margin: 0 0 0.4em;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text);
}
.project-tile-placeholder {
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 180px;
  border: 1.5px dashed var(--color-border);
  background: transparent;
}
.project-tile-placeholder:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--color-border);
}
.project-tile-placeholder .project-tile-body {
  padding: 1.2em;
}
.project-tile-placeholder p {
  color: var(--color-text-muted);
  font-style: italic;
}

details { margin: 0.8em 0 1.2em; max-width: var(--measure-wide); }
details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text);
}
details[open] summary { margin-bottom: 0.6em; }

figure { margin: 1.6em 0; max-width: var(--measure-wide); }
figcaption {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.5em;
}
.blog-figure { max-width: var(--measure-wide); }
.blog-figure-row {
  display: flex;
  gap: 1.4em;
  flex-wrap: wrap;
  max-width: var(--measure-wide);
}
.blog-figure-row figure { flex: 1 1 260px; margin: 1.6em 0; }

/* ---- Publications ------------------------------------------------------- */

.pub-list li { margin-bottom: 0.7em; }

.highlight-block {
  border-left: 3px solid var(--color-accent);
  padding-left: 1.2em;
  margin: 1.6em 0;
  max-width: var(--measure-wide);
}

/* ---- Blog index --------------------------------------------------------- */

.post-preview {
  margin: 1.8em 0;
  padding-bottom: 1.8em;
  border-bottom: 1px solid var(--color-border);
  max-width: var(--measure-wide);
}
.post-preview:last-child { border-bottom: none; }
.post-preview h2 { border: none; margin: 0 0 0.2em; padding: 0; font-size: 1.3rem; }
.post-preview .post-meta { margin: 0 0 0.7em; }

.post-meta {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.8em;
  align-items: baseline;
}
.post-meta time { font-weight: 600; }
.post-meta .tag::before { content: "· "; }

.post-title { margin-bottom: 0.2em; }
.post-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-text-muted);
  margin: 0 0 0.8em;
  max-width: var(--measure);
}
.back-link { font-size: 0.9rem; margin-bottom: 1.6em; }
.back-link a { text-decoration: none; color: var(--color-text-muted); }
.page-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-text-muted);
  margin: -0.6em 0 1.4em;
}

/* ---- Back-to-top --------------------------------------------------------- */

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg-raised);
  color: var(--color-text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { color: var(--color-link); border-color: var(--color-link); }

/* ---- Small screens -------------------------------------------------------- */

@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero { flex-direction: column; }
  .hero-photo { width: 110px; height: 110px; }
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.25rem; }
}

/* ---- Table of contents (sticky sidebar) ---------------------------------- */

.page-with-toc {
  display: grid;
  grid-template-columns: minmax(0, var(--measure-wide)) 220px;
  gap: 3em;
  align-items: start;
}
.page-with-toc .page { min-width: 0; }

.toc-sidebar {
  position: sticky;
  top: 5rem;
  align-self: start;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
  padding-left: 1.2em;
  border-left: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  line-height: 1.5;
}
.toc-list li { margin-bottom: 0.55em; }
.toc-list li.toc-sub {
  margin-left: 1em;
  font-size: 0.92em;
}
.toc-list a {
  display: block;
  color: var(--color-text-muted);
  text-decoration: none;
}
.toc-list a:hover { color: var(--color-link); }
.toc-list a.is-active {
  color: var(--color-link);
  font-weight: 600;
  border-left: 2px solid var(--color-accent);
  margin-left: -1.2em;
  padding-left: calc(1.2em - 2px);
}

@media (max-width: 1024px) {
  .page-with-toc { display: block; }
  .toc-sidebar { display: none; }
}