/* ══════════════════════════════════════════════════
   Kunal A. Kathare — portfolio
   Palette: warm paper + rust accent, light & dark
   ══════════════════════════════════════════════════ */

:root {
  --bg:          #fbfaf8;
  --bg-tint:     #f4f1ec;
  --surface:     #ffffff;
  --ink:         #1b1a17;
  --ink-soft:    #46433d;
  --muted:       #726e66;
  --line:        #e6e2da;
  --accent:      #9c4a2f;
  --accent-tint: #f3e9e4;

  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --wrap: 760px;
  --r:    12px;
  --ease: cubic-bezier(.22, .68, .32, 1);
}

[data-theme="dark"] {
  --bg:          #131311;
  --bg-tint:     #1a1917;
  --surface:     #1c1b18;
  --ink:         #efece6;
  --ink-soft:    #cbc7bf;
  --muted:       #9d988f;
  --line:        #2d2b27;
  --accent:      #e3906b;
  --accent-tint: #2a2019;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  transition: background .4s var(--ease), color .4s var(--ease);
}

/* faint paper grain / vignette */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 55% at 50% -10%, var(--accent-tint), transparent 70%);
  opacity: .7;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 26px;
  position: relative;
  z-index: 1;
}

a { color: inherit; }

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 12px; top: 12px;
  z-index: 99;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ─────────── nav ─────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.nav.is-stuck { border-bottom-color: var(--line); }

.nav__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 14px 26px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav__mark {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-decoration: none;
  color: var(--ink);
  flex-shrink: 0;
}

.nav__links {
  display: flex;
  gap: 22px;
  margin-left: auto;
  font-size: .855rem;
  letter-spacing: .01em;
}
.nav__links a {
  text-decoration: none;
  color: var(--muted);
  position: relative;
  padding-block: 3px;
  transition: color .22s var(--ease);
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s var(--ease);
}
.nav__links a:hover { color: var(--ink); }
.nav__links a:hover::after,
.nav__links a.is-active::after { transform: scaleX(1); }
.nav__links a.is-active { color: var(--ink); }

.theme {
  flex-shrink: 0;
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}
.theme:hover { color: var(--accent); border-color: var(--accent); transform: rotate(-18deg); }
.theme svg {
  width: 17px; height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
}
.theme__moon { display: none; }
[data-theme="dark"] .theme__sun  { display: none; }
[data-theme="dark"] .theme__moon { display: block; }

/* ─────────── hero ─────────── */

.hero {
  padding: clamp(60px, 13vh, 120px) 0 clamp(48px, 9vh, 84px);
}

/* ─────────── avatar ─────────── */

.avatar {
  --size: 148px;
  width: var(--size);
  height: var(--size);
  margin: 0 0 30px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--bg-tint);
  box-shadow: inset 0 0 0 1px var(--line);
}
/* present in the markup but takes no space until a photo is found in assets/ */
.avatar:not(.has-photo) { display: none; }

.avatar__photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

@media (max-width: 620px) {
  .avatar { --size: 112px; margin-bottom: 24px; }
}

.hero__eyebrow {
  font-family: var(--mono);
  font-size: .715rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 22px;
}

.hero__name {
  font-family: var(--serif);
  font-size: clamp(2.9rem, 10.5vw, 5.1rem);
  font-weight: 400;
  line-height: .96;
  letter-spacing: -.025em;
  margin: 0 0 26px;
  font-variation-settings: "SOFT" 0, "WONK" 0;
}

.hero__lede {
  font-size: clamp(1.05rem, 2.4vw, 1.2rem);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 34em;
  margin: 0 0 14px;
}
.hero__lede em {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink);
}

.hero__where {
  font-size: .93rem;
  color: var(--muted);
  margin: 0 0 32px;
}
.hero__where strong { color: var(--ink-soft); font-weight: 500; }

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 52px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 17px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: .875rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink-soft);
  transition: all .24s var(--ease);
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}
.btn svg {
  width: 15px; height: 15px;
  fill: none; stroke: currentColor;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
  transition: transform .24s var(--ease);
}
.btn:hover svg { transform: translateX(3px); }

.btn--primary {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}
.btn--primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* stats */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}
.stat {
  background: var(--surface);
  padding: 16px 14px;
  text-align: center;
}
.stat dt {
  font-family: var(--mono);
  font-size: .655rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 5px;
}
.stat dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.42rem;
  line-height: 1.1;
  color: var(--ink);
}

/* ─────────── sections ─────────── */

.section {
  padding: clamp(56px, 10vh, 96px) 0;
  border-top: 1px solid var(--line);
}

.label {
  font-family: var(--mono);
  font-size: .705rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 30px;
}

.prose p {
  margin: 0 0 20px;
  color: var(--ink-soft);
  max-width: 40em;
}
.prose p:last-child { margin-bottom: 0; }
.prose em {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink);
}
.prose strong { color: var(--ink); font-weight: 500; }

/* ─────────── research cards ─────────── */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(255px, 1fr));
  gap: 14px;
  margin-bottom: 34px;
}
.card {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}
.card:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  transform: translateY(-3px);
}
.card__num {
  color: var(--accent);
  font-size: .8rem;
  display: block;
  margin-bottom: 10px;
}
.card h3 {
  font-family: var(--serif);
  font-size: 1.06rem;
  font-weight: 500;
  line-height: 1.3;
  margin: 0 0 9px;
  letter-spacing: -.01em;
}
.card p {
  margin: 0;
  font-size: .885rem;
  line-height: 1.58;
  color: var(--muted);
}

/* tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.tags li {
  font-family: var(--mono);
  font-size: .715rem;
  letter-spacing: .02em;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: var(--bg-tint);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.tags li:hover { color: var(--accent); border-color: var(--accent); }

/* ─────────── news ─────────── */

.news {
  list-style: none;
  padding: 0;
  margin: 0;
}
.news__item {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}
.news__item:last-child { border-bottom: none; }

.news__date {
  font-family: var(--mono);
  font-size: .715rem;
  letter-spacing: .04em;
  color: var(--accent);
  background: var(--accent-tint);
  border-radius: 5px;
  padding: 3px 7px;
  height: fit-content;
  text-align: center;
  white-space: nowrap;
  margin-top: 2px;
}
.news__text {
  font-size: .9rem;
  line-height: 1.58;
  color: var(--ink-soft);
}
.news__text strong { color: var(--ink); font-weight: 600; }
.news__text a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 50%, transparent);
  text-underline-offset: 3px;
  transition: color .2s var(--ease);
}
.news__text a:hover { color: var(--accent); }

/* ─────────── publications ─────────── */

.pub__year-head {
  font-family: var(--serif);
  font-size: 1.28rem;
  font-weight: 500;
  color: var(--ink);
  margin: 34px 0 4px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--line);
  letter-spacing: -.01em;
}
.pub__year-head:first-of-type { margin-top: 0; }

.pubs {
  list-style: none;
  padding: 0;
  margin: 0 0 4px;
}

.pub {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  align-items: center;
  padding: 22px 0;
}

/* teaser: before image, crossfading to after on hover */
.pub__teaser {
  position: relative;
  width: 140px;
  aspect-ratio: 1;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-tint);
}
.pub__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity .35s var(--ease), transform .5s var(--ease);
}
.pub__img--after  { opacity: 1; }
.pub__img--before { opacity: 1; }
.pub:hover .pub__img--before { opacity: 0; }
.pub:hover .pub__img--after  { transform: scale(1.04); }

.pub__title {
  font-family: var(--serif);
  font-size: 1.11rem;
  font-weight: 500;
  line-height: 1.32;
  letter-spacing: -.012em;
  margin: 0 0 7px;
}

.pub__authors {
  font-size: .845rem;
  color: var(--muted);
  margin: 0 0 3px;
  line-height: 1.5;
}
.pub__authors strong {
  color: var(--ink);
  font-weight: 600;
}

.pub__where {
  font-size: .845rem;
  color: var(--ink-soft);
  margin: 0 0 10px;
}
.pub__where em {
  font-style: italic;
  font-family: var(--serif);
}

.pub__links {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  font-family: var(--mono);
  font-size: .74rem;
}
.pub__links a {
  text-decoration: none;
  color: var(--accent);
  letter-spacing: .01em;
  transition: opacity .2s var(--ease);
}
.pub__links a:hover { opacity: .62; text-decoration: underline; text-underline-offset: 3px; }
.pub__cites {
  font-family: var(--mono);
  font-size: .715rem;
  color: var(--muted);
}

/* ─────────── timeline ─────────── */

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
}
.tl {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 22px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}
.tl:first-child { border-top: none; padding-top: 0; }
.tl:last-child { padding-bottom: 0; }

.tl__when {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .03em;
  color: var(--muted);
  padding-top: 5px;
}

.tl__what h3 {
  font-family: var(--serif);
  font-size: 1.09rem;
  font-weight: 500;
  line-height: 1.32;
  margin: 0 0 3px;
  letter-spacing: -.01em;
}
.tl__role {
  font-size: .81rem;
  color: var(--accent);
  margin: 0 0 9px;
  letter-spacing: .01em;
}
.tl__what > p:last-child {
  margin: 0;
  font-size: .885rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ─────────── education ─────────── */

.sublabel {
  font-family: var(--mono);
  font-size: .705rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 38px 0 16px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.tl__grade { margin: 0 0 10px; }

.grade {
  display: inline-block;
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--ink);
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  border-radius: 6px;
  padding: 3px 9px;
}
.grade__max {
  color: var(--muted);
  font-size: .9em;
}

.awards {
  list-style: none;
  padding: 0;
  margin: 0;
}
.award {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}
.award:last-child { border-bottom: none; }

.award__year {
  font-family: var(--mono);
  font-size: .715rem;
  letter-spacing: .04em;
  color: var(--accent);
  background: var(--accent-tint);
  border-radius: 5px;
  padding: 3px 7px;
  height: fit-content;
  text-align: center;
  white-space: nowrap;
  margin-top: 2px;
}
.award__text {
  font-size: .9rem;
  line-height: 1.58;
  color: var(--muted);
}
.award__text strong { color: var(--ink); font-weight: 600; }

/* ─────────── contact ─────────── */

.contact__head {
  font-family: var(--serif);
  font-size: clamp(1.42rem, 4vw, 1.95rem);
  font-weight: 400;
  line-height: 1.28;
  letter-spacing: -.018em;
  margin: 0 0 34px;
  max-width: 26em;
}

.contact__links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.clink {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 17px 19px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  text-decoration: none;
  transition: all .26s var(--ease);
}
.clink:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.clink__k {
  font-size: .93rem;
  font-weight: 500;
  color: var(--ink);
}
.clink:hover .clink__k { color: var(--accent); }
.clink__v {
  font-family: var(--mono);
  font-size: .715rem;
  color: var(--muted);
}

/* ─────────── footer ─────────── */

.foot {
  border-top: 1px solid var(--line);
  padding: 26px 0 34px;
}
.foot__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: .715rem;
  color: var(--muted);
  letter-spacing: .02em;
}
.foot__inner a {
  text-decoration: none;
  transition: color .22s var(--ease);
}
.foot__inner a:hover { color: var(--accent); }

/* ─────────── scroll reveal ─────────── */

/* Content is visible by default. Only when JS is present (html.js) do we
   hide it for the entrance animation — so a JS failure can never blank the page. */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .72s var(--ease), transform .72s var(--ease);
}
.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ─────────── responsive ─────────── */

@media (max-width: 620px) {
  body { font-size: 16px; }

  .nav__links { gap: 15px; font-size: .8rem; }
  .nav__links a[href="#experience"],
  .nav__links a[href="#education"],
  .nav__links a[href="#research"] { display: none; }

  .stats { grid-template-columns: repeat(2, 1fr); }

  .pub {
    grid-template-columns: 104px 1fr;
    gap: 16px;
    align-items: start;
  }
  .pub__teaser { width: 104px; }

  .tl {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .tl__when { padding-top: 0; }

  .news__item,
  .award { grid-template-columns: 66px 1fr; gap: 12px; }
}

@media (max-width: 420px) {
  .nav__links a[href="#about"] { display: none; }
  .hero__links .btn { flex: 1 1 auto; justify-content: center; }
}

/* ─────────── a11y / print ─────────── */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
}

@media print {
  .nav, .theme, .foot__inner a, body::before { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .js .reveal { opacity: 1 !important; transform: none !important; }
  .section { border-color: #ccc; page-break-inside: avoid; }
  .pub { page-break-inside: avoid; }
  .pub__img--before { opacity: 0 !important; }
  a { text-decoration: none; color: #000; }
}