:root {
  --bg: #fafaf8;
  --ink: #1a1a1a;
  --ink-soft: #555;
  --ink-faint: #888;
  --rule: #e5e3dd;
  --accent: #3a3a7c;
  --accent-hover: #1f1f58;
  --tag-bg: #ecebe5;
  --max-width: 760px;
  --pad-x: 24px;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  font-feature-settings: "ss01" on, "cv02" on;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html[data-lang="bn"] body {
  font-family: "Hind Siliguri", "Noto Sans Bengali", system-ui, sans-serif;
  font-size: 17.5px;
  line-height: 1.75;
}

.wrap { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--pad-x); }

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 120ms ease, color 120ms ease; }
a:hover { color: var(--accent-hover); border-bottom-color: currentColor; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(180%) blur(6px);
}
.header-row {
  display: flex; align-items: center; gap: 24px;
  padding-top: 18px; padding-bottom: 18px;
}
.wordmark {
  font-weight: 700;
  color: var(--ink);
  border: 0;
  letter-spacing: -0.01em;
  font-size: 18px;
  font-family: "Inter", system-ui, sans-serif;
}
.wordmark:hover { color: var(--ink); }
.site-nav {
  display: flex; gap: 20px; flex: 1; flex-wrap: wrap;
  font-size: 14.5px;
}
.site-nav a { color: var(--ink-soft); border: 0; }
.site-nav a:hover { color: var(--accent); }
.lang-toggle {
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.lang-toggle:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* Language toggle: hide inactive */
html[data-lang="bn"] [data-en] { display: none !important; }
html[data-lang="en"] [data-bn] { display: none !important; }

/* Sections */
main { padding-bottom: 96px; }
.hero { padding-top: 72px; padding-bottom: 48px; }
.hero-head {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.3;
  margin: 0 0 24px;
  color: var(--ink);
}
html[data-lang="bn"] .hero-head { font-size: 26px; line-height: 1.55; font-weight: 600; letter-spacing: 0; }
.hero-body { font-size: 17px; color: var(--ink-soft); max-width: 640px; }
html[data-lang="bn"] .hero-body { font-size: 18px; }

.section { padding-top: 72px; padding-bottom: 0; }
.section-head {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
  margin: 0 0 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}
html[data-lang="bn"] .section-head { text-transform: none; letter-spacing: 0.02em; font-size: 15px; }

.subhead {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin: 40px 0 16px;
}
html[data-lang="bn"] .subhead { text-transform: none; letter-spacing: 0; }

/* Themes */
.theme-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px 40px;
}
@media (max-width: 640px) { .theme-grid { grid-template-columns: 1fr; gap: 28px; } }
.theme h3 { margin: 0 0 8px; font-size: 17px; font-weight: 600; color: var(--ink); }
.theme p { margin: 0; color: var(--ink-soft); font-size: 15.5px; }
html[data-lang="bn"] .theme p { font-size: 16.5px; }

/* Publications */
.pub-list { list-style: none; padding: 0; margin: 0; }
.pub { padding: 20px 0; border-bottom: 1px solid var(--rule); }
.pub-meta { display: flex; gap: 12px; align-items: baseline; margin-bottom: 6px; font-size: 13px; color: var(--ink-faint); }
.pub-year { font-variant-numeric: tabular-nums; font-weight: 600; color: var(--ink); }
.pub-venue { background: var(--tag-bg); color: var(--ink); padding: 2px 10px; border-radius: 4px; font-weight: 500; font-size: 12px; letter-spacing: 0.01em; }
.pub-title { font-size: 17px; font-weight: 600; color: var(--ink); margin: 4px 0 8px; line-height: 1.4; }
.pub-authors { margin: 0 0 6px; font-size: 14px; color: var(--ink-soft); }
.author.lab { color: var(--ink); font-weight: 600; }
.pub-note { margin: 0 0 6px; font-size: 14.5px; color: var(--ink-soft); }
html[data-lang="bn"] .pub-note { font-size: 15.5px; }
.pub-links { margin: 0; font-size: 13.5px; }

.inprogress-list { list-style: none; padding: 0; margin: 12px 0 0; color: var(--ink-soft); font-size: 15px; }
.inprogress-list li { padding: 8px 0; border-bottom: 1px dashed var(--rule); }
.inprogress-list strong { color: var(--ink); font-weight: 600; }

/* Models & datasets */
.lead { color: var(--ink-soft); font-size: 16px; margin: 0 0 8px; }
.model-list, .repo-list { list-style: none; padding: 0; margin: 0; }
.model-list > li, .repo-list > li { padding: 14px 0; border-bottom: 1px solid var(--rule); }
.model-name, .repo-name { font-weight: 600; color: var(--ink); border: 0; }
.model-name:hover, .repo-name:hover { color: var(--accent); border-bottom: 1px solid currentColor; }
.model-size { color: var(--ink-faint); font-size: 13px; margin-left: 10px; }
.model-list p, .repo-list p { margin: 4px 0 0; font-size: 14.5px; color: var(--ink-soft); }
html[data-lang="bn"] .model-list p, html[data-lang="bn"] .repo-list p { font-size: 15.5px; }
.repo-desc { display: block; margin-top: 2px; color: var(--ink-soft); font-size: 14.5px; }

/* Drishtikon & body text */
.body-text { color: var(--ink); font-size: 16px; }
html[data-lang="bn"] .body-text { font-size: 17px; }
.body-text p { margin: 0 0 14px; }
.inline-links { margin: 16px 0 0; color: var(--ink-soft); font-size: 14.5px; }
.dot { color: var(--ink-faint); padding: 0 4px; }

/* People */
.people-list { list-style: none; padding: 0; margin: 0; }
.person { padding: 16px 0; border-bottom: 1px solid var(--rule); display: flex; gap: 16px; align-items: center; }
.person-photo {
  width: 56px; height: 56px; border-radius: 50%;
  object-fit: cover; flex-shrink: 0;
  background: var(--tag-bg);
  border: 1px solid var(--rule);
}
.person-photo.placeholder {
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--ink-faint); font-weight: 600; font-size: 15px;
  letter-spacing: 0.03em;
  font-family: "Inter", system-ui, sans-serif;
}
.person-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.person-name { font-weight: 600; color: var(--ink); font-size: 16px; }
.person-name a { color: var(--ink); border: 0; }
.person-name a:hover { color: var(--accent); }
.person-meta { color: var(--ink-soft); font-size: 14px; }
html[data-lang="bn"] .person-meta { font-size: 15px; }

/* Footer */
.site-footer { margin-top: 80px; border-top: 1px solid var(--rule); padding: 32px 0; color: var(--ink-faint); font-size: 13.5px; }
.footer-row { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-note { margin: 0; }
.footer-links { margin: 0; }
.footer-links a { color: var(--ink-soft); }

/* Focus styles */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}