/* ------------------------------------------------------------------
   saatvikkher.github.io — stylesheet
   Plain CSS, no build step. Light palette on :root, dark palette via
   prefers-color-scheme. Edit the tokens below to retheme the site.
   ------------------------------------------------------------------ */

:root {
  --bg: #fbfbfa;
  --bg-elev: #ffffff;
  --text: #1c1c1a;
  --text-muted: #5f5f5b;
  --text-faint: #8a8a85;
  --border: #e4e4df;
  --accent: #0f6e6e;
  --accent-soft: #e6f2f2;
  --accent-text: #0b5555;
  --pill-bg: #f1f1ee;
  --pill-text: #3d3d3a;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.05);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --nav-h: 56px;
  color-scheme: light;
}

/* Dark palette: applied when the OS prefers dark and the visitor has not
   forced light, or when the toggle has explicitly set dark. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131414;
    --bg-elev: #1b1d1d;
    --text: #e8e8e4;
    --text-muted: #a9a9a3;
    --text-faint: #7c7c76;
    --border: #2b2e2e;
    --accent: #5fc2bf;
    --accent-soft: #163232;
    --accent-text: #8fd8d5;
    --pill-bg: #242727;
    --pill-text: #cfcfca;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
    --bg: #131414;
    --bg-elev: #1b1d1d;
    --text: #e8e8e4;
    --text-muted: #a9a9a3;
    --text-faint: #7c7c76;
    --border: #2b2e2e;
    --accent: #5fc2bf;
    --accent-soft: #163232;
    --accent-text: #8fd8d5;
    --pill-bg: #242727;
    --pill-text: #cfcfca;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
}

/* ---------- base ---------- */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  font-feature-settings: "cv11", "ss01", "tnum";
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration: underline;
}

p {
  margin: 0 0 1em;
}

img {
  max-width: 100%;
  display: block;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  z-index: 100;
}

.skip-link:focus {
  left: 8px;
}

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

.wrap {
  max-width: 800px;
  margin: 0 auto;
  padding-inline: 20px;
}

main {
  padding-block: 2.5rem 3rem;
}

section {
  scroll-margin-top: calc(var(--nav-h) + 20px);
  margin-bottom: 3.25rem;
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0;
}

h2 {
  font-size: 1.35rem;
  font-weight: 650;
  margin-bottom: 1.1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 1.75rem 0 0.9rem;
}

h2 + h3 {
  margin-top: 0;
}

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

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav .wrap {
  min-height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-block: 0.5rem;
}

.nav .brand {
  font-weight: 650;
  color: var(--text);
  letter-spacing: -0.01em;
}

.nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.nav ul a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav ul a:hover,
.nav ul a[aria-current="page"] {
  color: var(--text);
  text-decoration: none;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin: -4px 0;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

/* Show the icon for the theme you would switch TO. */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

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

.hero {
  display: flex;
  gap: 2rem;
  align-items: center;
  margin-bottom: 2rem;
}

.hero img {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: var(--shadow);
}

.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}

.hero .role {
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.hero .tagline {
  margin-bottom: 0.9rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.9rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.links a:hover {
  color: var(--accent);
  text-decoration: none;
}

.links svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

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

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.85rem 1.1rem;
  border-radius: 0 8px 8px 0;
  margin-bottom: 3rem;
  font-size: 0.97rem;
}

.callout p {
  margin: 0;
}

.callout strong {
  color: var(--accent-text);
}

/* ---------- news ---------- */

.news {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 1rem;
  padding: 0.4rem 0;
}

.news time {
  color: var(--text-faint);
  font-size: 0.9rem;
  white-space: nowrap;
  padding-top: 0.1rem;
}

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

.note {
  color: var(--text-faint);
  font-size: 0.88rem;
  margin: -0.5rem 0 1rem;
}

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

.pubs li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}

.pubs li:last-child {
  border-bottom: none;
}

.pubs .title {
  font-weight: 600;
  display: block;
  margin-bottom: 0.15rem;
  color: var(--text);
}

.pubs .title:hover {
  color: var(--accent);
  text-decoration: none;
}

.pubs .authors {
  color: var(--text-muted);
  font-size: 0.93rem;
}

.pubs .venue {
  color: var(--text-muted);
  font-size: 0.93rem;
  font-style: italic;
}

.pubs .me {
  font-weight: 600;
  color: var(--text);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.45rem;
}

.pill {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--pill-bg);
  color: var(--pill-text);
  border: 1px solid transparent;
}

a.pill:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}


/* ---------- publication type tags ---------- */

.tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid transparent;
  white-space: nowrap;
}

.tag-journal    { --tag-bg: #e6edfc; --tag-text: #26499b; }
.tag-magazine   { --tag-bg: #fdeddd; --tag-text: #8f4f0d; }
.tag-conference { --tag-bg: #f1e7fc; --tag-text: #66399f; }
.tag-workshop   { --tag-bg: #e2f4e8; --tag-text: #1d663a; }
.tag-preprint   { --tag-bg: #eceff2; --tag-text: #48535e; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .tag-journal    { --tag-bg: #1a2749; --tag-text: #a6c0f5; }
  :root:not([data-theme="light"]) .tag-magazine   { --tag-bg: #3a2814; --tag-text: #f3bc80; }
  :root:not([data-theme="light"]) .tag-conference { --tag-bg: #2b1e44; --tag-text: #c9adf2; }
  :root:not([data-theme="light"]) .tag-workshop   { --tag-bg: #143020; --tag-text: #86d5a1; }
  :root:not([data-theme="light"]) .tag-preprint   { --tag-bg: #262b30; --tag-text: #adb8c2; }
}

:root[data-theme="dark"] .tag-journal    { --tag-bg: #1a2749; --tag-text: #a6c0f5; }
:root[data-theme="dark"] .tag-magazine   { --tag-bg: #3a2814; --tag-text: #f3bc80; }
:root[data-theme="dark"] .tag-conference { --tag-bg: #2b1e44; --tag-text: #c9adf2; }
:root[data-theme="dark"] .tag-workshop   { --tag-bg: #143020; --tag-text: #86d5a1; }
:root[data-theme="dark"] .tag-preprint   { --tag-bg: #262b30; --tag-text: #adb8c2; }

/* ---------- experience ---------- */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.timeline li {
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
}

.timeline li:last-child {
  border-bottom: none;
}

.timeline .when {
  color: var(--text-faint);
  font-size: 0.9rem;
  padding-top: 0.15rem;
}

.timeline .what strong {
  font-weight: 600;
}

.timeline .org {
  color: var(--text-muted);
}

.timeline ul {
  margin: 0.4rem 0 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
  font-size: 0.94rem;
}

.timeline ul li {
  display: list-item;
  padding: 0.15rem 0;
  border: none;
}

.compact {
  list-style: none;
  margin: 0;
  padding: 0;
}

.compact li {
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: 1rem;
  padding: 0.35rem 0;
}

.compact .when {
  color: var(--text-faint);
  font-size: 0.9rem;
}

.compact .org {
  color: var(--text-muted);
}

/* ---------- teaching / awards / skills ---------- */

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.grid-2 li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.35rem 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.95rem;
}

.grid-2 .term {
  color: var(--text-faint);
  font-size: 0.88rem;
  white-space: nowrap;
}

.grid-2 .school {
  display: block;
  color: var(--text-muted);
  font-size: 0.85rem;
}

dl.skills {
  margin: 0;
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: 0.5rem 1rem;
}

dl.skills dt {
  color: var(--text-muted);
  font-weight: 500;
}

dl.skills dd {
  margin: 0;
}

/* ---------- cv page ---------- */

.cv-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.55rem 1rem;
  border-radius: 8px;
}

.btn:hover {
  text-decoration: none;
  filter: brightness(1.08);
}

.btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.cv-frame {
  width: 100%;
  height: 88vh;
  min-height: 600px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev);
  box-shadow: var(--shadow);
}

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

footer {
  border-top: 1px solid var(--border);
  padding-block: 1.5rem 2.5rem;
  color: var(--text-faint);
  font-size: 0.88rem;
}

footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

footer a {
  color: var(--text-muted);
}

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  body {
    font-size: 15.5px;
  }

  .nav ul {
    gap: 0.9rem;
  }

  .nav ul a {
    font-size: 0.88rem;
  }

  .hero {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .hero img {
    width: 120px;
    height: 120px;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .news li,
  .timeline li,
  .compact li,
  dl.skills {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .timeline .when,
  .compact .when {
    font-size: 0.84rem;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .cv-frame {
    height: 70vh;
    min-height: 420px;
  }
}