/* Pawan Prakash — personal site
   Colors are defined once here. Change --accent to restyle every link and highlight. */

:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --ink: #1b1d20;
  --muted: #5a5f66;
  --faint: #868b92;
  --rule: #e5e2da;
  --accent: #0d6468;
  --accent-ink: #0a5256;
  --accent-soft: #e4efee;
  --first: #fbf7ec;
  --thumb-bg: #ffffff;
  --thumb-filter: none;
  --shadow: 0 1px 2px rgba(20, 22, 25, 0.05), 0 4px 16px rgba(20, 22, 25, 0.04);

  --serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --maxw: 900px;
  --gutter: 24px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121416;
    --surface: #181b1e;
    --ink: #e7e5e0;
    --muted: #a4a9af;
    --faint: #7d838a;
    --rule: #2a2e33;
    --accent: #6ec6c1;
    --accent-ink: #8fd6d2;
    --accent-soft: #1b3131;
    --first: #1b1d1a;
    --thumb-bg: #f4f2ee;
    --thumb-filter: brightness(0.93);
    --shadow: none;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121416;
  --surface: #181b1e;
  --ink: #e7e5e0;
  --muted: #a4a9af;
  --faint: #7d838a;
  --rule: #2a2e33;
  --accent: #6ec6c1;
  --accent-ink: #8fd6d2;
  --accent-soft: #1b3131;
  --first: #1b1d1a;
  --thumb-bg: #f4f2ee;
  --thumb-filter: brightness(0.93);
  --shadow: none;
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

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

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

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

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 56px; }
.brand { font-family: var(--serif); font-weight: 600; font-size: 1.1rem; color: var(--ink); letter-spacing: -0.01em; white-space: nowrap; }
.brand:hover { color: var(--ink); text-decoration: none; }
.nav { display: flex; align-items: center; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--muted); font-size: 0.9rem; padding: 6px 10px; border-radius: 6px; white-space: nowrap; }
.nav a:hover { color: var(--ink); background: var(--accent-soft); text-decoration: none; }

.theme-toggle {
  flex: none; display: inline-grid; place-items: center;
  width: 34px; height: 34px; margin-left: 4px;
  border: 1px solid var(--rule); border-radius: 8px;
  background: var(--surface); color: var(--muted); cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .moon { display: none; }
}

/* ---------- Hero ---------- */
.hero { display: grid; grid-template-columns: 220px 1fr; gap: 40px; align-items: start; padding: 56px 0 24px; }
.portrait { width: 220px; height: auto; aspect-ratio: 1; border-radius: 16px; object-fit: cover; box-shadow: var(--shadow); background: var(--rule); }
.hero h1 { font-family: var(--serif); font-weight: 600; font-size: 2.5rem; line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 6px; }
.role { color: var(--muted); font-size: 1rem; margin: 0 0 18px; }
.role strong { color: var(--ink); font-weight: 500; }
.bio p { margin: 0 0 12px; }
.bio .seeking { background: var(--accent-soft); border-radius: 8px; padding: 10px 14px; margin-top: 16px; }

.links { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 10px; padding: 0; list-style: none; }
.links a {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 12px; border: 1px solid var(--rule); border-radius: 999px;
  background: var(--surface); color: var(--ink); font-size: 0.9rem; font-weight: 500;
}
.links a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.links svg { width: 15px; height: 15px; flex: none; }
.contact { color: var(--faint); font-size: 0.85rem; margin: 4px 0 0; }
.contact a { color: var(--muted); }

.interests { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 18px 0 0; list-style: none; }
.interests li { font-size: 0.8rem; color: var(--muted); border: 1px dashed var(--rule); border-radius: 6px; padding: 3px 9px; }

/* ---------- Sections ---------- */
section { padding: 36px 0 8px; }
h2 {
  font-family: var(--serif); font-weight: 600; font-size: 1.5rem; letter-spacing: -0.01em;
  margin: 0 0 18px; padding-bottom: 8px; border-bottom: 1px solid var(--rule);
}
h3.sub { font-family: var(--sans); font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--faint); margin: 26px 0 12px; }
h3.sub:first-of-type { margin-top: 4px; }

/* News */
.news { list-style: none; margin: 0; padding: 0; }
.news li { display: grid; grid-template-columns: 92px 1fr; gap: 14px; padding: 7px 0; }
.news time { color: var(--faint); font-size: 0.88rem; font-variant-numeric: tabular-nums; padding-top: 1px; }

/* Publications */
.pub { display: grid; grid-template-columns: 200px 1fr; gap: 24px; padding: 18px; margin: 0 -18px 6px; border-radius: 12px; }
.pub.first { background: var(--first); }
.pub-thumb {
  display: flex; align-items: center; justify-content: center; width: 200px; height: 136px; padding: 8px;
  background: var(--thumb-bg); border: 1px solid var(--rule); border-radius: 10px; overflow: hidden;
}
.pub-thumb img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; filter: var(--thumb-filter); }
.pub-thumb.tile { background: var(--accent-soft); border-color: transparent; text-align: center; }
.pub-thumb.tile span { font-family: var(--serif); font-weight: 600; font-size: 1.35rem; color: var(--accent-ink); line-height: 1.2; }
.pub-thumb.tile small { display: block; font-family: var(--sans); font-weight: 500; font-size: 0.72rem; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; margin-top: 6px; }
.pub h4 { font-family: var(--sans); font-size: 1.02rem; font-weight: 600; line-height: 1.4; margin: 0 0 6px; }
.pub h4 a { color: var(--ink); }
.pub h4 a:hover { color: var(--accent); }
.authors { font-size: 0.9rem; color: var(--muted); margin: 0 0 4px; line-height: 1.5; }
.authors .me { color: var(--ink); font-weight: 600; }
.venue { font-size: 0.9rem; margin: 0 0 8px; color: var(--ink); }
.venue em { font-style: italic; }
.badge { display: inline-block; font-size: 0.74rem; font-weight: 600; color: var(--accent-ink); background: var(--accent-soft); border-radius: 5px; padding: 1px 7px; margin-left: 6px; vertical-align: 1px; white-space: nowrap; }
.summary { font-size: 0.9rem; color: var(--muted); margin: 0 0 10px; }
.plinks { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; list-style: none; }
.plinks a { font-size: 0.8rem; font-weight: 500; padding: 2px 9px; border: 1px solid var(--rule); border-radius: 6px; background: var(--surface); color: var(--muted); }
.plinks a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }
.note { font-size: 0.82rem; color: var(--faint); margin: 10px 0 0; }

/* Generic dated rows (talks, experience, awards) */
.rows { list-style: none; margin: 0; padding: 0; }
.rows li { display: grid; grid-template-columns: 92px 1fr; gap: 14px; padding: 7px 0; }
.rows .when { color: var(--faint); font-size: 0.88rem; font-variant-numeric: tabular-nums; padding-top: 1px; }
.rows .what { font-size: 0.95rem; }
.rows .detail { display: block; color: var(--muted); font-size: 0.88rem; }
.tag { font-size: 0.74rem; color: var(--faint); border: 1px solid var(--rule); border-radius: 5px; padding: 0 6px; margin-left: 6px; white-space: nowrap; }

.exp li { padding: 10px 0; }
.exp .what strong { font-weight: 600; }

/* Software */
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.card { display: block; padding: 14px 16px; border: 1px solid var(--rule); border-radius: 10px; background: var(--surface); color: var(--ink); }
.card:hover { border-color: var(--accent); text-decoration: none; color: var(--ink); }
.card b { display: block; font-weight: 600; font-size: 0.95rem; }
.card span { display: block; color: var(--muted); font-size: 0.86rem; margin-top: 3px; }
.card code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.76rem; color: var(--faint); display: block; margin-top: 8px; }

footer { margin-top: 48px; border-top: 1px solid var(--rule); padding: 22px 0 40px; color: var(--faint); font-size: 0.84rem; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; }

/* ---------- Small screens ---------- */
@media (max-width: 720px) {
  :root { --gutter: 16px; }
  .topbar .wrap { height: 52px; }
  .nav a.opt { display: none; }
  .hero { grid-template-columns: 1fr; gap: 20px; padding: 32px 0 12px; }
  .portrait { width: 132px; border-radius: 14px; }
  .hero h1 { font-size: 2rem; }
  .pub { grid-template-columns: 1fr; gap: 12px; padding: 14px; margin: 0 -14px 6px; }
  .pub-thumb { width: 100%; height: 150px; }
  .news li, .rows li { grid-template-columns: 76px 1fr; gap: 10px; }
  .cards { grid-template-columns: 1fr; }
}

@media print {
  .topbar, .theme-toggle { display: none; }
  body { background: #fff; color: #000; }
  .pub.first { background: none; }
}

/* ---------- Hero sidebar ---------- */
.side { display: flex; flex-direction: column; gap: 14px; }
.side .links { flex-direction: column; margin: 4px 0 0; gap: 6px; }
.side .links a { width: 100%; border-radius: 8px; padding: 7px 12px; }
.side .contact { margin: 0; line-height: 1.7; word-break: break-word; }

/* ---------- Talks ---------- */
.talks { display: grid; gap: 18px; }
.talk h4 { font-size: 0.98rem; font-weight: 600; margin: 0 0 4px; }
.talk ul { list-style: none; margin: 0; padding: 0; }
.talk li { display: grid; grid-template-columns: 56px 1fr; gap: 10px; padding: 3px 0; font-size: 0.92rem; color: var(--muted); }
.talk .when { color: var(--faint); font-size: 0.86rem; font-variant-numeric: tabular-nums; padding-top: 1px; }
.tag.accent { color: var(--accent-ink); background: var(--accent-soft); border-color: transparent; font-weight: 600; }

@media (max-width: 720px) {
  .hero { display: grid; grid-template-columns: 96px 1fr; column-gap: 16px; row-gap: 0; }
  .hero > .side, .hero > div { display: contents; }
  .hero .portrait { grid-column: 1; grid-row: 1 / span 2; width: 96px; border-radius: 12px; align-self: center; }
  .hero h1 { grid-column: 2; grid-row: 1; align-self: end; font-size: 1.8rem; margin: 0; }
  .hero .role { grid-column: 2; grid-row: 2; align-self: start; margin: 6px 0 0; font-size: 0.92rem; line-height: 1.45; }
  .hero .links { grid-column: 1 / -1; grid-row: 3; flex-direction: row; flex-wrap: wrap; margin: 20px 0 0; }
  .hero .links a { width: auto; border-radius: 999px; padding: 5px 11px; font-size: 0.84rem; }
  .hero .contact { grid-column: 1 / -1; grid-row: 4; font-size: 0.82rem; margin: 10px 0 0; }
  .hero .contact br { display: none; }
  .hero .contact a + br + a::before { content: "\00a0·\00a0"; color: var(--faint); }
  .hero .bio { grid-column: 1 / -1; grid-row: 5; margin-top: 20px; }
  .hero .interests { grid-column: 1 / -1; grid-row: 6; }
}