/* ayushexel — design system v2
   Identity: bookish serif + mono utility, cobalt accent, phase-plane motif.
   v2: unified stat bar, editorial section rules, calmer cards, tighter rhythm.
   NOTE: bump the ?v= query on <link>/<script> tags whenever this file changes
   (GitHub Pages caches assets for 10 min; versioned URLs prevent HTML/CSS skew). */

:root {
  color-scheme: light dark;
  --ground: #f4f6f9;
  --card: #ffffff;
  --ink: #1a222e;
  --muted: #4d5766;
  --faint: #8a94a3;
  --line: #dde2ea;
  --accent: #2b50d8;
  --accent-ink: #24399b;
  --accent-soft: #e9edfb;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Charter, Georgia, serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --ground: #0f141b; --card: #171d26; --ink: #e6eaf1; --muted: #a8b1bd;
    --faint: #6d7683; --line: #2b3441; --accent: #8ea5f7; --accent-ink: #aebff9;
    --accent-soft: #232e4e;
  }
}
:root[data-theme="light"] {
  color-scheme: light;
  --ground: #f4f6f9; --card: #ffffff; --ink: #1a222e; --muted: #4d5766;
  --faint: #8a94a3; --line: #dde2ea; --accent: #2b50d8; --accent-ink: #24399b;
  --accent-soft: #e9edfb;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --ground: #0f141b; --card: #171d26; --ink: #e6eaf1; --muted: #a8b1bd;
  --faint: #6d7683; --line: #2b3441; --accent: #8ea5f7; --accent-ink: #aebff9;
  --accent-soft: #232e4e;
}

* { box-sizing: border-box; }
html, body { background: var(--ground); margin: 0; padding: 0; }
body {
  font-family: var(--serif);
  color: var(--ink);
  line-height: 1.62;
  font-size: 1.0425rem;
  -webkit-font-smoothing: antialiased;
}
.page { max-width: 45rem; margin: 0 auto; padding: 1.6rem 1.4rem 4.5rem; }
.page-wide { max-width: 66rem; margin: 0 auto; padding: 1.6rem 1.5rem 3.5rem; }

a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px;
}
code { font-family: var(--mono); font-size: 0.88em; }

/* ---------- nav ---------- */
.nav {
  display: flex; align-items: center; gap: 0.7rem;
  padding-bottom: 1.1rem; margin-bottom: 2.4rem; border-bottom: 1px solid var(--line);
}
.nav .brand {
  font-weight: 700; font-size: 1rem; color: var(--ink);
  text-decoration: none; letter-spacing: -0.01em; margin-right: auto;
}
.nav a.item {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted); text-decoration: none;
  padding: 0.3rem 0.15rem; margin-left: 0.9rem;
}
.nav a.item:hover { color: var(--accent-ink); }
.nav a.item[aria-current="page"] {
  color: var(--accent-ink); border-bottom: 2px solid var(--accent); padding-bottom: 0.18rem;
}
.nav .theme-toggle {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em;
  background: none; border: 1px solid var(--line); border-radius: 999px;
  color: var(--muted); padding: 0.22rem 0.7rem; cursor: pointer; margin-left: 1.1rem;
}
.nav .theme-toggle:hover { color: var(--accent-ink); border-color: var(--accent); }

/* nav brand mark: rotating phase planes */
.brandmark { flex: none; display: inline-flex; }
.brandmark svg { display: block; }
.brandmark circle { fill: none; stroke: var(--line); stroke-dasharray: 2 3; }
.brandmark line { stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; }
.bm1, .bm2 { transform-origin: 14px 14px; }
.bm1 { animation: rot 9s linear infinite; }
.bm2 { animation: rot 27s linear infinite; }
@keyframes rot { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .bm1, .bm2 { animation: none; }
  .bm1 { transform: rotate(64deg); } .bm2 { transform: rotate(200deg); }
}

/* ---------- typography ---------- */
h1 {
  font-size: clamp(2.1rem, 5vw, 3rem); line-height: 1.05; margin: 0.1rem 0 0.7rem;
  font-weight: 700; letter-spacing: -0.02em; text-wrap: balance;
}
.eyebrow {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent-ink);
}
.dek {
  font-size: 1.12rem; line-height: 1.55; color: var(--muted);
  font-style: italic; margin: 0; max-width: 44rem; text-wrap: balance;
}
.small-mono { font-family: var(--mono); font-size: 0.74rem; color: var(--muted); }

/* editorial section header: eyebrow-weight title + rule running right */
.sechead {
  display: flex; align-items: center; gap: 1rem; margin: 0 0 1.1rem;
}
.sechead h2 {
  font-size: 1.02rem; font-weight: 700; letter-spacing: 0.01em; margin: 0;
  white-space: nowrap;
}
.sechead .eyebrow { white-space: nowrap; }
.sechead::after { content: ""; flex: 1; height: 1px; background: var(--line); }

h2 { font-size: 1.45rem; line-height: 1.25; letter-spacing: -0.01em; margin: 0 0 1rem; text-wrap: balance; }
section { margin-bottom: 2.6rem; }

/* ---------- hero ---------- */
.hero { margin-bottom: 2.2rem; }
.hero .links { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1.15rem; }
.hero .links a {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent-ink); text-decoration: none;
  border: 1px solid var(--line); border-radius: 999px; padding: 0.3rem 0.85rem;
  background: var(--card);
}
.hero .links a:hover { border-color: var(--accent); }

/* unified stat bar: one surface, hairline-divided cells */
.statbar {
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: var(--card); border: 1px solid var(--line); border-radius: 6px;
  margin: 1.6rem 0 0; overflow: hidden;
}
.statbar .cell { padding: 1.05rem 1.3rem; border-left: 1px solid var(--line); }
.statbar .cell:first-child { border-left: none; }
.statbar .n {
  font-size: 1.9rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.05;
  font-variant-numeric: tabular-nums;
}
.statbar .n a { text-decoration: none; color: var(--ink); }
.statbar .n a:hover { color: var(--accent-ink); }
.statbar .k {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--faint); margin-top: 0.35rem; display: block;
}
@media (max-width: 46rem) {
  .statbar { grid-template-columns: repeat(2, 1fr); }
  .statbar .cell:nth-child(3) { border-left: none; }
  .statbar .cell:nth-child(n+3) { border-top: 1px solid var(--line); }
}

/* ---------- layout grid ---------- */
.cols {
  display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 2.6rem; align-items: start;
}
@media (max-width: 56rem) { .cols { grid-template-columns: 1fr; } }

/* ---------- cards ---------- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 6px;
  padding: 1rem 1.2rem;
}
.stack { display: flex; flex-direction: column; gap: 0.7rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.85rem; }
@media (max-width: 40rem) { .grid-2 { grid-template-columns: 1fr; } }

/* co-created project cards */
.proj-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.9rem; }
@media (max-width: 40rem) { .proj-grid { grid-template-columns: 1fr; } }
.project {
  padding: 1rem 1.15rem; display: flex; flex-direction: column; gap: 0.25rem;
  transition: border-color 120ms ease, transform 120ms ease;
}
.project:hover { border-color: var(--accent); transform: translateY(-1px); }
.project .top { display: flex; align-items: baseline; justify-content: space-between; gap: 0.8rem; }
.project h3 { margin: 0; font-size: 1.04rem; letter-spacing: -0.01em; }
.project h3 a { text-decoration: none; }
.project h3 a:hover { text-decoration: underline; }
.project .meta {
  font-family: var(--mono); font-size: 0.72rem; color: var(--accent-ink);
  white-space: nowrap; font-variant-numeric: tabular-nums;
}
.project .role {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--faint);
}
.project p {
  margin: 0.15rem 0 0; font-size: 0.9rem; line-height: 1.5; color: var(--muted);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.project .paper {
  margin-top: 0.55rem; font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.04em;
}

/* section lead line */
.lead { margin: -0.2rem 0 1rem; font-size: 0.95rem; color: var(--muted); }
.lead strong { color: var(--ink); font-variant-numeric: tabular-nums; }

/* dense contribution rows (two lines: repo + what it added) */
.repo-list { padding: 0.3rem 1.15rem; }
.repo-list .row {
  padding: 0.6rem 0; border-bottom: 1px solid var(--line);
}
.repo-list .line1 { display: flex; align-items: baseline; gap: 0.8rem; }
.repo-list .contrib {
  font-size: 0.84rem; line-height: 1.45; color: var(--muted); margin-top: 0.12rem;
}
.repo-list .row:last-child, .repo-list details .row:last-child { border-bottom: none; }
.repo-list .row .name {
  font-family: var(--mono); font-size: 0.8rem; font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0;
}
.repo-list .row .name a { text-decoration: none; }
.repo-list .row .name a:hover { text-decoration: underline; }
.repo-list .row .stats {
  font-family: var(--mono); font-size: 0.72rem; color: var(--faint);
  margin-left: auto; white-space: nowrap; font-variant-numeric: tabular-nums;
}
.repo-list .row .stats .stars { color: var(--accent-ink); }
.repo-list details.more { margin: 0.4rem 0 0.55rem; }

details.more summary {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent-ink); cursor: pointer;
  list-style: none; display: inline-flex; align-items: center; gap: 0.45rem;
}
details.more summary::before { content: "+"; font-size: 0.95rem; }
details.more[open] summary::before { content: "−"; }
details.more summary::-webkit-details-marker { display: none; }

/* publications */
.pub { display: flex; gap: 0.9rem; align-items: baseline; padding: 0.8rem 1.15rem; }
.pub .cites {
  font-family: var(--mono); font-size: 0.72rem; color: var(--accent-ink);
  white-space: nowrap; margin-left: auto; font-variant-numeric: tabular-nums;
}
.pub .title { font-size: 0.92rem; line-height: 1.45; }
.pub .title a { text-decoration: none; }
.pub .title a:hover { text-decoration: underline; }
.pub .venue { font-family: var(--mono); font-size: 0.68rem; color: var(--faint); }

/* blog & video listings */
.post { padding: 1.05rem 1.2rem; transition: border-color 120ms ease; }
.post:hover { border-color: var(--accent); }
.post h3 { margin: 0.1rem 0 0.25rem; font-size: 1.08rem; }
.post h3 a { text-decoration: none; }
.post h3 a:hover { text-decoration: underline; }
.post .date {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--faint);
}
.post p { margin: 0.3rem 0 0; font-size: 0.92rem; color: var(--muted); }

.video { display: flex; gap: 0.9rem; align-items: baseline; padding: 0.8rem 1.15rem; transition: border-color 120ms ease; }
.video:hover { border-color: var(--accent); }
.video .title { font-size: 0.93rem; line-height: 1.45; }
.video .title a { text-decoration: none; }
.video .title a:hover { text-decoration: underline; }
.video .tag {
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent-ink); background: var(--accent-soft); border-radius: 999px;
  padding: 0.16rem 0.55rem; white-space: nowrap; margin-left: auto;
}

/* ---------- footer ---------- */
footer.site {
  margin-top: 3rem; padding-top: 1.3rem; border-top: 1px solid var(--line);
  font-family: var(--mono); font-size: 0.7rem; color: var(--faint);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
footer.site a { color: var(--muted); }

/* hero bio paragraph */
.hero .bio {
  margin: 0.85rem 0 0; font-size: 0.99rem; line-height: 1.65; color: var(--muted);
  max-width: 46rem;
}
.hero .bio a { color: var(--accent-ink); }

/* video cards: thumbnail + lite embed */
.vidcard { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.vidcard .thumb {
  display: block; position: relative; width: 100%; aspect-ratio: 16 / 9;
  padding: 0; border: none; background: #000; cursor: pointer;
}
.vidcard .thumb img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: opacity 120ms ease;
}
.vidcard .thumb:hover img { opacity: 0.85; }
.vidcard .playbtn {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #fff; font-size: 1.1rem; pointer-events: none;
}
.vidcard .playbtn::before {
  content: ""; position: absolute; width: 3.2rem; height: 3.2rem; border-radius: 999px;
  background: rgba(15, 20, 27, 0.72); border: 1px solid rgba(255,255,255,0.35);
}
.vidcard .playbtn { text-indent: 0.2rem; }
.vidcard .playbtn::first-letter { position: relative; }
.vidcard .thumb:hover + .vidbody .title a, .vidcard .thumb:hover ~ .vidbody { color: inherit; }
.vidcard .ytframe, .ytframe { width: 100%; aspect-ratio: 16 / 9; border: 0; display: block; background: #000; }
.vidcard .vidbody {
  display: flex; gap: 0.8rem; align-items: baseline; padding: 0.75rem 1.05rem 0.85rem;
}
.vidcard .title { font-size: 0.92rem; line-height: 1.45; }
.vidcard .title a { text-decoration: none; }
.vidcard .title a:hover { text-decoration: underline; }
.vidcard .tag {
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent-ink); background: var(--accent-soft); border-radius: 999px;
  padding: 0.16rem 0.55rem; white-space: nowrap; margin-left: auto;
}
.vidcard .playbtn span { position: relative; }

/* stacked bio paragraphs */
.hero .bio + .bio { margin-top: 0.55rem; }