/* ==========================================================================
   deepeshgoel.com
   Neutral greyscale, single restrained accent, one sans family.
   ========================================================================== */

:root {
  --bg:            #ffffff;
  --bg-raised:     #ffffff;
  --bg-sunken:     #f7f8f9;
  --text:          #15181c;
  --text-soft:     #4b5158;
  --text-faint:    #6f767f;   /* 4.6:1 on white, clears WCAG AA for small text */
  --rule:          #e5e7ea;
  --rule-strong:   #cdd1d6;
  --accent:        #1e4d7b;
  --accent-soft:   #eef2f6;
  --accent-text:   #1e4d7b;

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --measure: 70ch;
  --wrap: 1060px;
  --gutter: clamp(1.25rem, 5vw, 3rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #0f1115;
    --bg-raised:   #14171c;
    --bg-sunken:   #101319;
    --text:        #e7e9ec;
    --text-soft:   #a8aeb6;
    --text-faint:  #7b828c;   /* 4.6:1 on raised cards */
    --rule:        #23272e;
    --rule-strong: #333941;
    --accent:      #8fb4d9;
    --accent-soft: #161d26;
    --accent-text: #9dbfe2;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "cv05" 1;
}

/* ---------- typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--sans);
  line-height: 1.22;
  margin: 0 0 .65em;
  text-wrap: balance;
  color: var(--text);
}

h1 { font-size: clamp(2rem, 4.6vw, 2.85rem); font-weight: 650; letter-spacing: -.028em; }
h2 { font-size: clamp(1.3rem, 2.5vw, 1.6rem);  font-weight: 620; letter-spacing: -.018em; }
h3 { font-size: 1.06rem; font-weight: 620; letter-spacing: -.011em; }
h4 { font-size: .95rem;  font-weight: 620; letter-spacing: -.008em; }

p { margin: 0 0 1.15em; max-width: var(--measure); }
p:last-child { margin-bottom: 0; }

a {
  color: inherit;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: .22em;
  text-decoration-thickness: 1px;
  transition: color .13s ease, text-decoration-color .13s ease;
}
a:hover { color: var(--accent-text); text-decoration-color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

strong { font-weight: 620; color: var(--text); }

code, .mono { font-family: var(--mono); font-size: .87em; }

.lede {
  font-size: clamp(1.06rem, 1.9vw, 1.19rem);
  line-height: 1.6;
  font-weight: 400;
  color: var(--text-soft);
  letter-spacing: -.006em;
}

.eyebrow {
  font-family: var(--mono);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 1.4rem;
}

/* keep the small card labels from growing with the section labels */
.next-link .eyebrow { font-size: .68rem; letter-spacing: .12em; }

/* ---------- layout ---------- */

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.wrap-narrow { max-width: 748px; margin-inline: auto; padding-inline: var(--gutter); }

section { padding-block: clamp(3.25rem, 7vw, 5rem); }
section + section { border-top: 1px solid var(--rule); }

.skip-link {
  position: absolute; top: 0; left: 0;
  width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
  background: var(--accent); color: #fff;
  padding: .7rem 1.1rem; z-index: 100;
  font-size: .88rem; font-weight: 600;
}
.skip-link:focus {
  width: auto; height: auto; overflow: visible; clip-path: none;
}

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

.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: var(--wrap); margin-inline: auto;
  padding: .8rem var(--gutter);
  display: flex; align-items: center; gap: 1.75rem;
}
.nav-brand {
  font-weight: 620; font-size: .96rem; letter-spacing: -.015em;
  text-decoration: none; margin-right: auto; white-space: nowrap;
}
.nav-brand:hover { color: var(--accent-text); }
.nav-links { display: flex; gap: 1.5rem; align-items: center; font-size: .875rem; }
.nav-links a { text-decoration: none; color: var(--text-soft); font-weight: 450; white-space: nowrap; }
.nav-links a:hover { color: var(--text); }

/* The nav drops items as the viewport narrows, rather than overflowing. */
@media (max-width: 680px) {
  .nav-inner { gap: 1rem; }
  .nav-links { gap: 1rem; font-size: .82rem; }
  .nav-links a.nav-hide-sm { display: none; }
}
@media (max-width: 560px) {
  .nav-links { gap: .85rem; }
  .nav-links a.nav-hide-xs { display: none; }
}
@media (max-width: 420px) {
  .nav-links a.nav-hide-xxs { display: none; }
}

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

.hero { padding-block: clamp(3.25rem, 8vw, 5.5rem) 0; }

/* first section after the hero sets the whole gap on its own */
#research { padding-top: clamp(2.5rem, 5.5vw, 3.5rem); }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 208px;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
@media (max-width: 760px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
  .hero-portrait { order: -1; }
}

.hero h1 { margin-bottom: .3em; }

.hero-role {
  font-size: .96rem; font-weight: 450; color: var(--text-soft);
  margin: 0 0 1.5rem; line-height: 1.55;
}
.hero-role .sep { color: var(--rule-strong); padding-inline: .5rem; }

.hero-portrait img {
  width: 208px; height: 208px; max-width: 100%;
  border-radius: 2px; display: block; object-fit: cover;
  border: 1px solid var(--rule);
}
@media (max-width: 760px) {
  .hero-portrait img { width: 132px; height: 132px; border-radius: 50%; }
}

.hero-links { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.9rem; }

.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .48rem .9rem;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  font-size: .855rem; font-weight: 500;
  text-decoration: none; color: var(--text-soft);
  background: var(--bg-raised);
  transition: border-color .13s ease, color .13s ease, background .13s ease;
  white-space: nowrap;
}
.btn:hover { color: var(--text); border-color: var(--text-faint); }
.btn-primary { background: var(--text); color: var(--bg); border-color: var(--text); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn svg { width: 14px; height: 14px; flex: none; }

/* ---------- work cards ---------- */

.card-list {
  display: grid; gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 3px;
  overflow: hidden;
}
.card {
  background: var(--bg-raised);
  padding: clamp(1.35rem, 3vw, 1.9rem);
  display: block; text-decoration: none; color: inherit;
  transition: background .13s ease;
  position: relative;                 /* anchor for the stretched link */
}

/* The "Writeup" link covers the whole card, so the card is one big target.
   Any other link inside the card is lifted above it and stays clickable. */
.card-stretch::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
}
.card a:not(.card-stretch) { position: relative; z-index: 2; }

.card:has(.card-stretch):hover { background: var(--bg-sunken); }
.card:has(.card-stretch):hover h3 { color: var(--accent-text); }
.card:focus-within { background: var(--bg-sunken); }
.card-stretch:focus-visible { outline: none; }
.card:has(.card-stretch:focus-visible) { outline: 2px solid var(--accent); outline-offset: -2px; }

.card-top { display: flex; align-items: baseline; gap: .7rem; flex-wrap: wrap; margin-bottom: .5rem; }
.card h3 { margin: 0; }
.card p { color: var(--text-soft); font-size: .945rem; margin-bottom: .85rem; }

.tag {
  font-family: var(--mono);
  font-size: .67rem; letter-spacing: .05em; text-transform: uppercase;
  padding: .2rem .45rem; border-radius: 2px;
  background: var(--accent-soft); color: var(--accent-text);
  white-space: nowrap; font-weight: 500;
  border: 1px solid transparent;
}
.tag-plain { background: transparent; color: var(--text-faint); border-color: var(--rule); }
.tag a { color: inherit; text-decoration: none; }
.tag:has(a):hover { border-color: var(--text-faint); color: var(--text); }

.card-meta { display: flex; flex-wrap: wrap; gap: .35rem .45rem; margin-top: .85rem; }
.chip {
  font-size: .735rem; color: var(--text-faint);
  border: 1px solid var(--rule); border-radius: 2px;
  padding: .13rem .42rem; font-family: var(--mono);
}

.card-more { font-size: .82rem; font-weight: 550; color: var(--accent-text); }

/* secondary projects: same frame, less weight */
.card-compact { padding: 1.15rem clamp(1.35rem, 3vw, 1.9rem); }
.card-compact .card-top { margin-bottom: .35rem; }
.card-compact h3 { font-size: .96rem; font-weight: 600; }
.card-compact p { font-size: .9rem; margin-bottom: 0; }

/* ---------- callout ---------- */

.finding {
  border-left: 2px solid var(--rule-strong);
  padding: .1rem 0 .1rem 1.15rem;
  margin: 1.5rem 0;
  max-width: var(--measure);
}
.finding p { margin: 0; color: var(--text-soft); font-size: .945rem; }
.finding strong { color: var(--text); }

/* ---------- entries ---------- */

.entry {
  display: grid; grid-template-columns: 152px minmax(0, 1fr);
  gap: 1.6rem; padding-block: 1.6rem;
  border-top: 1px solid var(--rule);
}
.entry:first-of-type { border-top: none; padding-top: 0; }
@media (max-width: 700px) { .entry { grid-template-columns: 1fr; gap: .5rem; } }

.entry-when {
  font-family: var(--mono); font-size: .755rem;
  color: var(--text-faint); padding-top: .3rem; letter-spacing: .01em;
}
.entry-title { margin: 0 0 .12rem; font-size: 1.02rem; }
.entry-org { color: var(--text-soft); font-size: .9rem; margin: 0 0 .65rem; }
.entry-body { color: var(--text-soft); font-size: .935rem; }
.entry-body ul { margin: .35rem 0 0; padding-left: 1.1rem; }
.entry-body li { margin-bottom: .38rem; }
.entry-body li::marker { color: var(--text-faint); }

/* ---------- publications ---------- */

.pub {
  display: grid; grid-template-columns: 2rem minmax(0, 1fr);
  gap: .5rem; padding-block: 1.3rem;
  border-top: 1px solid var(--rule); align-items: start;
}
.pub:first-of-type { border-top: none; padding-top: 0; }
.pub-num { font-family: var(--mono); font-size: .755rem; color: var(--text-faint); padding-top: .28rem; }
.pub-title { font-size: 1.02rem; font-weight: 600; line-height: 1.38; margin: 0 0 .3rem; letter-spacing: -.012em; }
.pub-authors { font-size: .875rem; color: var(--text-soft); margin: 0 0 .3rem; }
.pub-authors .me { color: var(--text); font-weight: 620; }
.pub-venue { font-size: .84rem; color: var(--text-faint); margin: 0; }
.pub-badges { display: flex; gap: .35rem; flex-wrap: wrap; margin-top: .55rem; }

/* ---------- skills ---------- */

.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(225px, 1fr)); gap: 1.6rem 2.4rem; }
.skill-group h3 {
  margin: 0 0 .5rem;
  font-family: var(--mono);
  font-size: .69rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--text-faint); font-weight: 500;
}
.skill-group p { margin: 0; font-size: .9rem; color: var(--text-soft); line-height: 1.72; }

/* ---------- contact / footer ---------- */

.contact-links { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.6rem; }

.footer { border-top: 1px solid var(--rule); padding-block: 2.1rem; font-size: .81rem; color: var(--text-faint); }
.footer-inner {
  max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.footer a { color: var(--text-faint); text-decoration: none; }
.footer a:hover { color: var(--text); }

/* ---------- article pages ---------- */

.article-head { padding-block: clamp(2.25rem, 6vw, 3.75rem) 1.75rem; }
.back-link {
  font-size: .83rem; color: var(--text-faint); text-decoration: none;
  display: inline-flex; align-items: center; gap: .35rem; margin-bottom: 1.6rem;
}
.back-link:hover { color: var(--accent-text); }
.article-head h1 { font-size: clamp(1.75rem, 3.8vw, 2.35rem); }
.article-meta {
  display: flex; flex-wrap: wrap; gap: .4rem;
  margin-top: 1.4rem; padding-top: 1.4rem; border-top: 1px solid var(--rule);
}

.article-body { padding-bottom: clamp(3rem, 7vw, 4.5rem); }
.article-body h2 { font-size: clamp(1.18rem, 2.2vw, 1.4rem); margin-top: 2.6rem; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin-top: 1.85rem; font-size: 1rem; }
.article-body p, .article-body li { color: var(--text-soft); }
.article-body ul, .article-body ol { max-width: var(--measure); padding-left: 1.2rem; }
.article-body li { margin-bottom: .5rem; }
.article-body li::marker { color: var(--text-faint); }

.figure {
  margin: 2rem 0; padding: 1.4rem;
  background: var(--bg-sunken);
  border: 1px solid var(--rule); border-radius: 3px;
}
.figure svg { display: block; width: 100%; height: auto; }
.figure figcaption {
  font-size: .8rem; color: var(--text-faint); margin-top: .95rem;
  line-height: 1.6; padding-top: .8rem; border-top: 1px solid var(--rule);
}

.pullquote {
  font-size: clamp(1.06rem, 2vw, 1.22rem);
  line-height: 1.5; font-weight: 450; color: var(--text);
  border-left: 2px solid var(--accent);
  padding-left: 1.3rem; margin: 2.1rem 0; max-width: 48ch;
  letter-spacing: -.008em;
}

table { width: 100%; border-collapse: collapse; margin: 1.6rem 0; font-size: .88rem; }
th, td { text-align: left; padding: .6rem .8rem; border-bottom: 1px solid var(--rule); }
th {
  font-family: var(--mono); font-size: .69rem; letter-spacing: .09em;
  text-transform: uppercase; color: var(--text-faint); font-weight: 500;
  border-bottom-color: var(--rule-strong);
}
td { color: var(--text-soft); }
td.num { font-family: var(--mono); font-size: .84rem; white-space: nowrap; }
tbody tr:last-child td { border-bottom: none; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.next-links {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(235px, 1fr));
  gap: 1px; background: var(--rule);
  border: 1px solid var(--rule); border-radius: 3px;
  overflow: hidden; margin-top: 2.75rem;
}
.next-link {
  background: var(--bg-raised); padding: 1.15rem 1.35rem;
  text-decoration: none; color: inherit; transition: background .13s ease;
}
.next-link:hover { background: var(--bg-sunken); }
.next-link .eyebrow { margin-bottom: .35rem; }
.next-link strong { display: block; font-size: .94rem; font-weight: 600; }
.next-link:hover strong { color: var(--accent-text); }

/* ---------- print ---------- */

@media print {
  .nav, .hero-links, .contact-links, .next-links, .footer { display: none; }
  body { background: #fff; color: #000; font-size: 10.5pt; }
  section { padding-block: 1rem; break-inside: avoid; }
  a { text-decoration: none; }
}