/* Rayhaan Khan, personal site. Palette follows the figures in his manuscripts:
   sand = cold start, navy = warm start, teal = full recipe. */

:root {
  --bg: #ffffff;
  --paper: #f6f7f6;
  --ink: #17191c;
  --ink-2: #3d434a;
  --muted: #6a717a;
  --rule: #e2e5e8;
  --link: #2c4a86;
  --link-hover: #0b7f6b;
  --teal: #0f9a80;
  --navy: #3b4f82;
  --sand: #a8957c;
  --coral: #c2563a;
  --mark: rgba(15, 154, 128, 0.12);
  --fig-bg: #ffffff;
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1317;
    --paper: #161b20;
    --ink: #e8eaed;
    --ink-2: #c3c8ce;
    --muted: #8f98a2;
    --rule: #262d34;
    --link: #a3b8ee;
    --link-hover: #5fd4bb;
    --teal: #3cc7a8;
    --navy: #8ea2d8;
    --sand: #cbb697;
    --coral: #ec8a6c;
    --mark: rgba(60, 199, 168, 0.14);
    --fig-bg: #f4f4f2;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1317;
  --paper: #161b20;
  --ink: #e8eaed;
  --ink-2: #c3c8ce;
  --muted: #8f98a2;
  --rule: #262d34;
  --link: #a3b8ee;
  --link-hover: #5fd4bb;
  --teal: #3cc7a8;
  --navy: #8ea2d8;
  --sand: #cbb697;
  --coral: #ec8a6c;
  --mark: rgba(60, 199, 168, 0.14);
  --fig-bg: #f4f4f2;
  color-scheme: dark;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Spectral", Georgia, "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.6;
  font-weight: 400;
  font-feature-settings: "onum" 1, "kern" 1;
  text-rendering: optimizeLegibility;
}

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 56px 28px 72px;
}

a {
  color: var(--link);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size 0.2s ease, color 0.2s ease;
}
a:hover, a:focus-visible { color: var(--link-hover); background-size: 100% 1px; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; border-radius: 2px; }

.sc {
  font-family: "Spectral SC", "Spectral", Georgia, serif;
  font-weight: 500;
  letter-spacing: 0.03em;
}

/* ---------- header ---------- */

.intro {
  display: grid;
  grid-template-columns: 1fr 184px;
  gap: 44px;
  align-items: start;
}

.intro h1 {
  font-weight: 600;
  font-size: 46px;
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}

.intro .role {
  color: var(--muted);
  margin: 0 0 22px;
  font-size: 17px;
}

.intro p { margin: 0 0 14px; color: var(--ink-2); }

.links {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
  font-size: 17px;
}
.links li:not(:last-child)::after { content: "/"; color: var(--rule); margin: 0 12px; }

.portrait {
  margin: 8px 0 0;
}
.portrait img {
  display: block;
  width: 184px;
  height: 186px;
  object-fit: cover;
  border-radius: 50%;
  filter: saturate(0.92);
}
.portrait figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  line-height: 1.4;
}

/* ---------- sections ---------- */

section { margin-top: 64px; }

h2 {
  font-family: "Spectral SC", "Spectral", Georgia, serif;
  font-weight: 600;
  font-size: 23px;
  letter-spacing: 0.04em;
  margin: 0 0 22px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}
h2 .aside {
  font-family: "Spectral", Georgia, serif;
  font-weight: 400;
  font-size: 15px;
  letter-spacing: 0;
  color: var(--muted);
  font-style: italic;
}

.lede { color: var(--ink-2); margin: -4px 0 28px; }

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

.news { margin: 0; padding: 0; list-style: none; }
.news li {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 18px;
  padding: 7px 0;
  font-size: 17px;
  line-height: 1.5;
}
.news time { color: var(--muted); font-family: "Spectral SC", Georgia, serif; font-size: 16px; letter-spacing: 0.02em; white-space: nowrap; }

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

.entry {
  display: grid;
  grid-template-columns: 236px 1fr;
  gap: 32px;
  padding: 26px 0 30px;
  border-top: 1px solid var(--rule);
}
.entry:first-of-type { border-top: 0; padding-top: 4px; }

.teaser {
  margin: 4px 0 0;
  align-self: start;
  position: relative;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 3px;
  overflow: hidden;
}
.teaser svg { display: block; width: 100%; height: auto; }
.teaser figcaption {
  font-size: 12.5px;
  color: var(--muted);
  padding: 0 12px 9px;
  line-height: 1.35;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}
.teaser button.replay {
  font: inherit;
  color: var(--link);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}
.teaser button.replay:hover { color: var(--link-hover); }

.entry h3 {
  font-size: 20.5px;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 6px;
}
.entry h3 a { color: var(--ink); }
.entry h3 a:hover { color: var(--link-hover); }
.authors { margin: 0; font-size: 16.5px; color: var(--ink-2); }
.authors strong { font-weight: 600; color: var(--ink); }
.venue { margin: 0; font-size: 16.5px; font-style: italic; color: var(--ink-2); }
.context { margin: 2px 0 0; font-size: 15px; color: var(--muted); }

.actions {
  margin: 10px 0 12px;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  font-size: 16px;
}
.actions li:not(:last-child)::after { content: "/"; color: var(--muted); opacity: 0.5; margin: 0 10px; }
.actions button {
  font: inherit;
  color: var(--link);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}
.actions button:hover { color: var(--link-hover); }
.actions button[aria-expanded="true"] { color: var(--teal); }
.actions button::after { content: " +"; }
.actions button[aria-expanded="true"]::after { content: " \2212"; }

.entry p.summary { margin: 0; font-size: 17px; color: var(--ink-2); }
.entry p.summary + p.summary { margin-top: 10px; }
.mypart { font-size: 16px; color: var(--muted); margin: 10px 0 0; }
.mypart em { font-style: normal; color: var(--ink-2); }

/* expandable figure panels */
.figures {
  grid-column: 1 / -1;
  margin-top: 4px;
  display: grid;
  gap: 28px;
}
.figures[hidden] { display: none; }

.fig {
  margin: 0;
}
.fig .plate {
  background: var(--fig-bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 14px;
}
.fig img { display: block; width: 100%; height: auto; }
.fig figcaption {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-2);
}
.fig figcaption b { font-weight: 600; color: var(--ink); }

/* interactive TTT chart */
.chart-card {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 16px 16px 10px;
}
.seg {
  display: inline-flex;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
  background: var(--bg);
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.seg button {
  font: inherit;
  font-size: 14.5px;
  color: var(--ink-2);
  background: none;
  border: 0;
  border-radius: 999px;
  padding: 3px 12px;
  cursor: pointer;
}
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.chart-card svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart-card text { font-family: "Spectral", Georgia, serif; fill: var(--muted); }
.chart-note { font-size: 14px; color: var(--muted); margin: 4px 0 0; min-height: 1.5em; }

/* ---------- compact lists ---------- */

.items { margin: 0; padding: 0; list-style: none; }
.items > li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 24px;
  padding: 12px 0;
  border-top: 1px solid var(--rule);
}
.items > li:first-child { border-top: 0; padding-top: 0; }
.items .what { font-weight: 600; }
.items .when { color: var(--muted); font-family: "Spectral SC", Georgia, serif; font-size: 16px; white-space: nowrap; }
.items .detail { grid-column: 1 / -1; color: var(--ink-2); font-size: 17px; margin: 0; }

.field {
  display: grid;
  grid-template-columns: 1fr 150px;
  gap: 32px;
  align-items: start;
}
.field svg { width: 150px; height: auto; display: block; }
.formula { font-style: italic; white-space: nowrap; }

.awards { margin: 0; padding: 0; list-style: none; }
.awards li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  padding: 6px 0;
  font-size: 17px;
}
.awards .when { color: var(--muted); font-family: "Spectral SC", Georgia, serif; font-size: 16px; }

.edu p { margin: 0 0 10px; color: var(--ink-2); font-size: 17px; }
.edu p b { color: var(--ink); font-weight: 600; }

footer {
  margin-top: 80px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 15px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
}
.theme-toggle {
  font: inherit;
  color: var(--link);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

/* ---------- small screens ---------- */

@media (max-width: 760px) {
  body { font-size: 17px; }
  .page { padding: 32px 16px 56px; }
  .intro { grid-template-columns: 1fr; gap: 0; }
  .intro h1 { font-size: 38px; }
  .portrait { order: -1; margin: 0 0 20px; }
  .portrait img { width: 112px; height: 113px; }
  .portrait figcaption { display: none; }
  section { margin-top: 48px; }
  .news li { grid-template-columns: 1fr; gap: 0; }
  .entry { grid-template-columns: 1fr; gap: 18px; }
  .teaser { max-width: 420px; }
  .items > li { grid-template-columns: 1fr; }
  .items .when { order: -1; }
  .field { grid-template-columns: 1fr; }
  .awards li { grid-template-columns: 1fr; gap: 0; }
  .fig .plate { padding: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

@media print {
  .actions, .teaser figcaption button, .theme-toggle { display: none; }
  .figures[hidden] { display: grid; }
  a { color: inherit; }
}

.field-title { margin: 0 0 6px; }
.field-title b { font-weight: 600; }
.field-title .when { color: var(--muted); font-family: "Spectral SC", Georgia, serif; font-size: 16px; margin-left: 8px; }
.field .detail { margin: 0; color: var(--ink-2); font-size: 17px; }