/* ---------- tokens ---------- */
:root {
  --bg: #ffffff;
  --text: #22262a;
  --muted: #6b7170;
  --line: #e2e4e1;

  --accent: #1a73e8;
  --accent-hover: #1558b0;
  --accent-soft: rgba(26, 115, 232, 0.08);
  --accent-line: rgba(26, 115, 232, 0.28);
  --page-bg: #f4f5f6;
  --page-shadow: 0 0 14px rgba(0, 0, 0, 0.07);
  --page-edge: transparent;
  --frame-bg: #f8f8f8;
  --frame-edge: #d9dbdd;
  --frame-shadow: 0 0 8px rgba(0, 0, 0, 0.09);
  --card-bg: #ffffff;
  --card-shadow: 0 0 12px rgba(0, 0, 0, 0.07);

  --max-width: 940px;
  --serif: "Gelasio", Georgia, serif;
  --sans: "Public Sans", Arial, sans-serif;
  --radius: 6px;
  --body-size: 17px;
}

/* dark mode: opt-in via the toggle in the nav (light is the default) */
:root[data-theme="dark"] {
  /* monochrome: near-black sheet on black, links told apart by their underline */
  --bg: #0d0d0d;
  --text: #d9d9d9;
  --muted: #8f8f8f;
  --line: #222222;
  --page-bg: #000000;
  --page-edge: #1c1c1c;
  --page-shadow: none;
  --frame-bg: #161616;
  --frame-edge: #262626;
  --frame-shadow: none;
  --card-bg: #161616;
  --card-shadow: none;

  --accent: #ffffff;
  --accent-hover: #ffffff;
  --accent-soft: rgba(255, 255, 255, 0.06);
  --accent-line: rgba(255, 255, 255, 0.32);
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: var(--body-size);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: .06em;
  text-underline-offset: .2em;
  text-decoration-color: var(--accent-line);
  transition: color .15s, text-decoration-color .15s;
}
a:hover { color: var(--accent-hover); text-decoration-color: currentColor; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

strong { font-weight: 600; }
p { margin: 0 0 16px; }

/* the page sits on a raised sheet over a slightly darker backdrop */
.page {
  width: min(calc(var(--max-width) + 96px), calc(100% - 44px));
  margin: 36px auto 48px;
  padding: 44px 48px 40px;
  background: var(--bg);
  border: 1px solid var(--page-edge);
  border-radius: 8px;
  box-shadow: var(--page-shadow);
}

/* ---------- header ---------- */
.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.brand { color: inherit; text-decoration: none; }
.brand:hover { color: inherit; }
h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: 2.6rem;
  font-weight: 400;
  line-height: .96;
  letter-spacing: -.01em;
}
.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  font-size: .82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--accent); }
.theme-toggle {
  display: inline-flex; align-items: center;
  padding: 0; border: 0; background: none;
  color: var(--muted); cursor: pointer;
  transition: color .15s;
}
.theme-toggle:hover { color: var(--accent); }
.theme-toggle svg {
  width: 1.05rem; height: 1.05rem;
  fill: none; stroke: currentColor; stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ---------- sections ---------- */
section {
  padding: 34px 0 38px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 20px;
}
section:last-of-type { border-bottom: 0; }

h2 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 400;
  line-height: 1;
}

/* ---------- about + profile ---------- */
.about {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(190px, 30vw, 250px);
  column-gap: 32px;
}
.about-text { grid-column: 1; grid-row: 1; }
.about-text > :last-child { margin-bottom: 0; }

.profile {
  grid-column: 2;
  grid-row: 1;
  align-self: start;
  padding: 9px 9px 11px;
  background: var(--frame-bg);
  border-radius: var(--radius);
  border-bottom: 1px solid var(--frame-edge);
  border-right: 1px solid var(--frame-edge);
  box-shadow: var(--frame-shadow);
}
.profile img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 8;
  object-fit: cover;
  object-position: 50% 30%;
  border-radius: 4px;
  filter: saturate(.8);
}
.social-icons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 13px;
  margin-top: 10px;
}
.social-icons a {
  display: inline-flex;
  color: var(--text);
  text-decoration: none;
  transition: color .15s, transform .15s;
}
.social-icons a:hover { color: var(--accent); transform: translateY(-1px); }
.social-icons svg {
  width: 1.65rem;
  height: 1.65rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}


.wip { color: var(--muted); font-style: italic; }

/* ---------- papers ---------- */
.paper {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 16px;
  margin: 0 -16px 10px;
  padding: 12px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background-color .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.paper:hover, .paper:focus-within {
  background-color: var(--card-bg);
  border-color: var(--line);
  box-shadow: var(--card-shadow);
}
.paper:hover .paper-year { color: var(--text); }
.paper:hover .paper-title { color: var(--accent); }

/* the TL;DR stays collapsed until the card is hovered or focused */
.paper-details {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows .22s ease-in-out, opacity .12s ease;
}
.paper-details > div { min-height: 0; overflow: hidden; }
.paper:hover .paper-details, .paper:focus-within .paper-details {
  grid-template-rows: 1fr;
  opacity: 1;
  transition: grid-template-rows .32s cubic-bezier(.2, 0, 0, 1), opacity .24s ease 80ms;
}
/* touch screens have no hover: keep TL;DRs open */
@media (hover: none) {
  .paper-details { grid-template-rows: 1fr; opacity: 1; }
}
.paper-year {
  font-family: var(--serif);
  color: var(--muted);
  font-size: 1rem;
  padding-top: .15rem;
  font-variant-numeric: lining-nums;
}
.paper-heading { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.paper-title {
  font-family: var(--serif);
  font-size: 1.24rem;
  line-height: 1.2;
  color: var(--text);
  text-decoration: none;
}
.paper-title:hover { color: var(--accent); text-decoration: underline; }
.paper-authors { color: var(--muted); font-size: .93rem; line-height: 1.5; }
.paper-authors .me { color: var(--text); font-weight: 700; }
.paper-meta { margin-top: 4px; color: var(--muted); font-size: .9rem; }
.venue { color: var(--text); font-weight: 600; }
.paper-tldr {
  margin: 8px 0 0;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  font-size: .93rem;
  color: var(--muted);
  font-style: italic;
  max-width: 40rem;
}
.tldr-label {
  margin-right: .35em;
  font-style: normal;
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--text);
}
.paper-links { margin-top: 6px; font-size: .92rem; }
.paper-links a { font-weight: 600; text-decoration: none; }
.paper-links a:hover { text-decoration: underline; }
.paper-links a + a::before {
  content: "/";
  display: inline-block; /* keeps the separator out of the link underline */
  margin: 0 .5rem;
  color: var(--muted);
  font-weight: 400;
}

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

.footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px 20px;
  padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem;
}

.signature { font-style: italic; }

.toast {
  position: fixed; left: 50%; bottom: 24px;
  transform: translate(-50%, 8px);
  padding: 8px 14px;
  border-radius: var(--radius);
  background: var(--text); color: var(--bg);
  font-size: .88rem;
  opacity: 0; pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  /* on phones the sheet fills the screen: no backdrop, no shadow */
  body { background: var(--bg); }
  .page { width: 100%; margin: 0; padding: 28px 16px 40px; border: 0; border-radius: 0; box-shadow: none; }
  .topbar { flex-direction: column; align-items: flex-start; gap: 14px; }
  h1 { font-size: 2.3rem; }
  h2 { font-size: 1.75rem; }
  .about { grid-template-columns: 1fr; }
  .profile { grid-column: 1; grid-row: 1; width: 216px; margin: 0 auto 22px; }
  .social-icons { gap: 11px; }
  .profile img { aspect-ratio: 4 / 5; object-position: 50% 40%; }
  .about-text { grid-row: 2; }
  .paper { grid-template-columns: 1fr; gap: 2px; margin-left: -10px; margin-right: -10px; padding: 10px; }
}
@media (max-width: 520px) {
  body { font-size: calc(var(--body-size) - 1px); }
  h1 { font-size: 2rem; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}