/* ══════════════════════════════════════════════════════════════════════
   Ashwin Nedungadi — single-page · clean academic homepage
   White background · single column · minimal · light/dark toggle.
   ════════════════════════════════════════════════════════════════════ */

:root {
  --bg:       #ffffff;
  --text:     #1a1a1a;
  --muted:    #5a5f66;
  --faint:    #8a9099;
  --border:   #e6e8eb;
  --accent:   #1a56c4;     /* academic blue links */
  --tag-bg:   #f2f4f7;
  --code-bg:  #f5f6f8;
  --maxw:     760px;
  --font-serif: "Newsreader", Georgia, "Times New Roman", serif;
  --font-sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
[data-theme="dark"] {
  --bg:       #121417;
  --text:     #e7e9ec;
  --muted:    #a2a8b0;
  --faint:    #6b727b;
  --border:   #262a30;
  --accent:   #7aa2ff;
  --tag-bg:   #1c1f24;
  --code-bg:  #1a1d22;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .2s ease, color .2s ease;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--accent) 22%, transparent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 1.5rem; }

/* ── Top nav ─────────────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(8px); backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { max-width: var(--maxw); margin-inline: auto; padding: 0 1.5rem;
  height: 54px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { font-weight: 600; font-size: 0.98rem; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 1.3rem; }
.nav-link { font-size: 0.88rem; color: var(--muted); }
.nav-link:hover { color: var(--text); text-decoration: none; }
.nav-link.is-active { color: var(--text); font-weight: 500; }
.nav-right { display: flex; align-items: center; gap: 0.5rem; }
.toggle, .menu-btn {
  width: 34px; height: 34px; border-radius: 7px; display: grid; place-items: center;
  background: transparent; border: 1px solid var(--border); color: var(--muted); cursor: pointer;
  transition: color .2s, border-color .2s;
}
.toggle:hover, .menu-btn:hover { color: var(--text); border-color: var(--faint); }
.toggle svg, .menu-btn svg { width: 16px; height: 16px; }
.toggle .icon-sun { display: none; }
[data-theme="dark"] .toggle .icon-sun { display: block; }
[data-theme="dark"] .toggle .icon-moon { display: none; }
.menu-btn { display: none; }
@media (max-width: 640px) {
  .menu-btn { display: grid; }
  .nav-links {
    position: absolute; top: 54px; left: 0; right: 0; flex-direction: column; align-items: flex-start;
    gap: 0; background: var(--bg); border-bottom: 1px solid var(--border); padding: 0.25rem 1.5rem 0.75rem;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-link { width: 100%; padding: 0.6rem 0; border-bottom: 1px solid var(--border); }
  .nav-link:last-child { border-bottom: none; }
}

/* ── Header / intro ──────────────────────────────────────────────────── */
.intro { padding-top: 3rem; padding-bottom: 1rem; }
.intro-grid { display: flex; flex-direction: column-reverse; gap: 1.6rem; }
@media (min-width: 620px) { .intro-grid { flex-direction: row; align-items: flex-start; justify-content: space-between; gap: 2.2rem; } }
.intro h1 { font-family: var(--font-serif); font-weight: 500; font-size: 2.2rem; line-height: 1.1; letter-spacing: -0.01em; }
.intro .role { color: var(--muted); margin-top: 0.5rem; font-size: 1.02rem; }
.intro .role a { color: var(--text); border-bottom: 1px solid var(--border); }
.intro .role a:hover { text-decoration: none; border-color: var(--accent); }
.photo { flex: 0 0 auto; }
.photo img { width: 150px; height: 150px; object-fit: cover; border-radius: 10px; border: 1px solid var(--border); }
@media (min-width: 620px) { .photo img { width: 168px; height: 196px; } }

.links-row { display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; margin-top: 1rem; }
.links-row a { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; color: var(--accent); }
.links-row a svg { width: 15px; height: 15px; }

/* ── Sections ────────────────────────────────────────────────────────── */
section { padding-block: 1.6rem; }
.section-title {
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--faint); padding-bottom: 0.5rem; margin-bottom: 1.1rem; border-bottom: 1px solid var(--border);
}
.prose p { max-width: none; }
.prose p + p { margin-top: 1rem; }
.lead { color: var(--text); }
.prose a, .lead a { color: var(--accent); }

/* education list */
.facts { margin-top: 1.2rem; display: grid; gap: 0; }
.fact { display: grid; grid-template-columns: 64px 1fr; gap: 1rem; padding: 0.7rem 0; border-top: 1px solid var(--border); align-items: baseline; }
.fact:last-child { border-bottom: 1px solid var(--border); }
.fact dt { font-size: 0.78rem; font-weight: 600; color: var(--muted); }
.fact dd { font-size: 0.94rem; }
.fact dd .sub { display: block; color: var(--muted); font-size: 0.85rem; }

.fact dd .grade { font-size: 0.74rem; font-weight: 600; color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border)); border-radius: 999px; padding: 0.02rem 0.45rem; margin-left: 0.35rem; white-space: nowrap; }

/* skills */
.skills { display: grid; gap: 0.55rem; margin-top: 0.2rem; }
.skill-row { display: grid; grid-template-columns: 150px 1fr; gap: 0.8rem; align-items: baseline; }
.skill-cat { font-size: 0.78rem; font-weight: 600; color: var(--muted); }
.skill-vals { font-size: 0.86rem; color: var(--text); }
@media (max-width: 520px) { .skill-row { grid-template-columns: 1fr; gap: 0.1rem; } }

/* publications */
.pub-list { list-style: none; padding: 0; display: grid; gap: 0; counter-reset: pub; }
.pub { display: grid; grid-template-columns: 58px 1fr; gap: 0 1.2rem; padding: 0.85rem 0; border-top: 1px solid var(--border); }
.pub:last-child { border-bottom: 1px solid var(--border); }
.pub-year { font-size: 0.85rem; color: var(--faint); font-variant-numeric: tabular-nums; padding-top: 0.1rem; }
.pub-title { font-size: 0.96rem; font-weight: 600; line-height: 1.4; }
.pub-authors { font-size: 0.88rem; color: var(--muted); margin-top: 0.15rem; }
.pub-authors strong { color: var(--text); font-weight: 600; }
.pub-venue { font-size: 0.86rem; color: var(--muted); font-style: italic; margin-top: 0.15rem; }
.pub-tag { font-style: normal; font-size: 0.68rem; font-weight: 500; color: var(--muted); padding: 0.05rem 0.5rem; border: 1px solid var(--border); border-radius: 999px; margin-left: 0.35rem; white-space: nowrap; }
.pub-tag.accepted { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.pub .links { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 0.4rem; }
.pub .links a { font-size: 0.85rem; }
@media (max-width: 560px) { .pub { grid-template-columns: 1fr; gap: 0.15rem; } }

/* award rank chip */
.award-rank { font-size: 0.7rem; color: var(--faint); border: 1px solid var(--border); border-radius: 999px; padding: 0.02rem 0.45rem; margin-left: 0.35rem; white-space: nowrap; }

/* research list */
.r-list { display: grid; gap: 1.1rem; }
.r-item { }
.r-item h3 { font-size: 1.02rem; font-weight: 600; display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem; }
.r-item h3 .exp { font-weight: 400; font-size: 0.85rem; color: var(--faint); }
.r-item .status { font-size: 0.7rem; font-weight: 500; color: var(--muted); padding: 0.1rem 0.5rem; border: 1px solid var(--border); border-radius: 999px; }
.r-item .status.active { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.r-item p { color: var(--muted); font-size: 0.94rem; margin-top: 0.25rem; }

.subhead { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; color: var(--faint); margin: 1.8rem 0 0.9rem; }
.past-list { display: grid; gap: 0.7rem; }
.past-item { font-size: 0.94rem; }
.past-item .name { font-weight: 600; }
.past-item .role { color: var(--accent); font-size: 0.82rem; }
.past-item .blurb { color: var(--muted); }

/* projects (publication style) */
.proj-list { display: grid; gap: 1.4rem; }
.proj { display: grid; grid-template-columns: 1fr; gap: 0.15rem; }
@media (min-width: 620px) { .proj { grid-template-columns: 58px 1fr 180px; gap: 0 1.2rem; } }
.proj .yr { font-size: 0.85rem; color: var(--faint); font-variant-numeric: tabular-nums; padding-top: 0.1rem; }
.proj-thumb { display: block; cursor: zoom-in; margin-top: 0.6rem; }
.proj-thumb img { width: 100%; height: 130px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); transition: transform .18s ease, box-shadow .18s ease; }
.proj-thumb:hover img { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,.12); }
@media (min-width: 620px) {
  .proj-thumb { grid-column: 3; grid-row: 1; margin-top: 0.1rem; }
  .proj-thumb img { height: 116px; }
}
.proj h3 { font-size: 1.0rem; font-weight: 600; }
.proj .org { color: var(--muted); font-size: 0.88rem; font-style: italic; margin-top: 0.1rem; }
.proj p { color: var(--muted); font-size: 0.92rem; margin-top: 0.4rem; }
.proj .links { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 0.5rem; }
.proj .links a { font-size: 0.85rem; }
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.55rem; }
.tag { font-size: 0.72rem; color: var(--muted); background: var(--tag-bg); padding: 0.15rem 0.55rem; border-radius: 5px; }

/* recent news */
.news-list { list-style: none; padding: 0; display: grid; gap: 0; }
.news-item { display: grid; grid-template-columns: 90px 1fr; gap: 1rem; padding: 0.7rem 0; border-top: 1px solid var(--border); align-items: baseline; }
.news-item:last-child { border-bottom: 1px solid var(--border); }
.news-date { font-size: 0.78rem; font-weight: 600; color: var(--faint); font-variant-numeric: tabular-nums; }
.news-text { font-size: 0.94rem; color: var(--text); }
.news-text a { color: var(--accent); }
@media (max-width: 460px) { .news-item { grid-template-columns: 70px 1fr; gap: 0.8rem; } }

/* writing */
.writing-row { display: block; padding: 0.4rem 0; }
.writing-row:hover { text-decoration: none; }
.writing-row .meta { font-size: 0.8rem; color: var(--faint); }
.writing-row h3 { font-size: 1.0rem; font-weight: 600; color: var(--text); margin-top: 0.15rem; }
.writing-row:hover h3 { color: var(--accent); }
.writing-row p { color: var(--muted); font-size: 0.92rem; margin-top: 0.2rem; }

/* photos */
.photo-strip { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem; margin-top: 1.2rem; max-width: 560px; }
.photo-strip img { width: 100%; height: 200px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }
.photo-strip figcaption { font-size: 0.78rem; color: var(--faint); margin-top: 0.4rem; }

/* contact */
.contact-row { display: flex; flex-wrap: wrap; gap: 0.5rem 1.4rem; margin-top: 0.4rem; }
.contact-row a { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.95rem; }
.contact-row a svg { width: 16px; height: 16px; }

/* footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 2.5rem; padding: 1.8rem 0 3rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; justify-content: space-between; align-items: center; }
.site-footer .wrap > span:last-child { display: inline-flex; flex-wrap: wrap; gap: 0.4rem 1rem; }
.site-footer, .site-footer a { color: var(--faint); font-size: 0.82rem; }
.site-footer a:hover { color: var(--text); }

section[id], header[id] { scroll-margin-top: 64px; }

/* ── Sub-page header (art.html) ──────────────────────────────────────── */
.page-head { padding-top: 2.4rem; padding-bottom: 0.4rem; }
.page-head h1 { font-family: var(--font-serif); font-weight: 500; font-size: 2.2rem; line-height: 1.1; letter-spacing: -0.01em; margin-top: 0.6rem; }
.page-head .role { color: var(--muted); margin-top: 0.5rem; font-size: 1.02rem; max-width: 60ch; }
.back-link { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.85rem; color: var(--muted); }
.back-link:hover { color: var(--text); text-decoration: none; }
.back-link svg { width: 15px; height: 15px; }

/* ── Art ─────────────────────────────────────────────────────────────── */
.art-quote { margin: 1.1rem 0 1.4rem; padding-left: 0.9rem; border-left: 2px solid var(--border);
  font-family: var(--font-serif); font-style: italic; font-size: 1.05rem; color: var(--text); }
.art-quote cite { display: block; font-style: normal; font-family: var(--font-sans); font-size: 0.82rem; color: var(--faint); margin-top: 0.3rem; }

.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.9rem; }
@media (min-width: 560px) { .gallery { grid-template-columns: repeat(3, 1fr); } }
.art-card { margin: 0; cursor: zoom-in; }
.art-card img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); transition: transform .18s ease, box-shadow .18s ease; }
.art-card:hover img { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,.12); }
.art-card figcaption { margin-top: 0.45rem; line-height: 1.35; }
.art-card .art-name { display: block; font-size: 0.86rem; font-weight: 600; color: var(--text); }
.art-card .art-medium { display: block; font-size: 0.76rem; color: var(--faint); }

.aiart-list { display: grid; gap: 1.6rem; margin-top: 0.4rem; }
.aiart { display: grid; grid-template-columns: 1fr; gap: 0.9rem; }
@media (min-width: 620px) { .aiart { grid-template-columns: 200px 1fr; gap: 1.3rem; align-items: start; } }
.aiart-thumb { display: block; cursor: zoom-in; }
.aiart-thumb img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }
.aiart-body h3 { font-size: 1.02rem; font-weight: 600; display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem; }
.aiart-body h3 .exp { font-weight: 400; font-size: 0.8rem; color: var(--faint); }
.aiart-body p { color: var(--muted); font-size: 0.92rem; margin-top: 0.35rem; }
.aiart-body .links { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 0.55rem; }
.aiart-body .links a { font-size: 0.85rem; }
.mosaic-strip { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0.4rem; margin-top: 0.7rem; }
.mosaic-strip img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 5px; border: 1px solid var(--border); cursor: zoom-in; image-rendering: pixelated; }

/* ── Lightbox ────────────────────────────────────────────────────────── */
.lightbox { position: fixed; inset: 0; z-index: 100; display: none; place-items: center;
  background: rgba(8,10,12,.86); -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px); padding: 4vmin; }
.lightbox.open { display: grid; }
.lb-figure { margin: 0; max-width: 92vw; max-height: 90vh; display: flex; flex-direction: column; align-items: center; gap: 0.6rem; }
.lb-figure img { max-width: 92vw; max-height: 82vh; width: auto; height: auto; border-radius: 8px; box-shadow: 0 12px 40px rgba(0,0,0,.5); }
.lb-figure figcaption { color: #e7e9ec; font-size: 0.85rem; text-align: center; }
.lb-close { position: fixed; top: 1rem; right: 1.2rem; width: 42px; height: 42px; border-radius: 50%;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.25); color: #fff; font-size: 1.6rem;
  line-height: 1; display: grid; place-items: center; cursor: pointer; transition: background .2s, border-color .2s; }
.lb-close:hover { background: rgba(255,255,255,.18); border-color: rgba(255,255,255,.4); }

/* ── Jekyll blog (matches site design) ──────────────────────────────── */
.site-main { display: block; }
.section { padding-block: 1.6rem; }
.eyebrow { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); }
.lede, .lede p { color: var(--muted); }
.reveal { opacity: 1; }

.post-list { display: grid; gap: 0; margin-top: 1.4rem; }
.post-row { display: block; padding: 0.95rem 0; border-top: 1px solid var(--border); }
.post-row:last-child { border-bottom: 1px solid var(--border); }
.post-row:hover { text-decoration: none; }
.post-row h3 { font-size: 1.05rem; font-weight: 600; color: var(--text); margin-top: 0.15rem; }
.post-row:hover h3 { color: var(--accent); }
.post-row .excerpt { color: var(--muted); font-size: 0.92rem; margin-top: 0.25rem; }
.post-meta { font-size: 0.82rem; color: var(--faint); }
.empty-note { color: var(--muted); font-family: var(--font-serif); font-style: italic; margin-top: 1.5rem; }
.empty-note code { background: var(--code-bg); padding: 0.1rem 0.35rem; border-radius: 4px; font-size: 0.9em; }

.post-header h1, article .page-head h1 { font-family: var(--font-serif); font-weight: 500; font-size: 2rem; line-height: 1.15; letter-spacing: -0.01em; margin-top: 0.55rem; }
.post-body { margin-top: 1.6rem; font-size: 1.02rem; line-height: 1.75; }
.post-body > * + * { margin-top: 1rem; }
.post-body h2 { font-family: var(--font-serif); font-weight: 500; font-size: 1.45rem; margin-top: 1.9rem; }
.post-body h3 { font-size: 1.12rem; font-weight: 600; margin-top: 1.5rem; }
.post-body a { color: var(--accent); }
.post-body ul, .post-body ol { padding-left: 1.35rem; }
.post-body li + li { margin-top: 0.3rem; }
.post-body code { background: var(--code-bg); padding: 0.1rem 0.35rem; border-radius: 4px; font-size: 0.9em; }
.post-body pre { background: var(--code-bg); padding: 1rem; border-radius: 8px; overflow: auto; border: 1px solid var(--border); }
.post-body pre code { background: none; padding: 0; font-size: 0.85em; }
.post-body blockquote { border-left: 2px solid var(--border); padding-left: 1rem; color: var(--muted); font-style: italic; }
.post-body img { border-radius: 8px; border: 1px solid var(--border); margin: 0.6rem 0; }