/* lesceller.com: single stylesheet, no build step */

:root {
  color-scheme: light dark;
  --bg: #fafafc;
  --fg: #15171c;
  --muted: #5b6472;
  --line: #e4e6eb;
  --accent: #4f46e5;
  --accent-2: #0891b2;
  --accent-soft: rgba(79, 70, 229, 0.08);
  --accent-2-soft: rgba(8, 145, 178, 0.07);
  --chip-bg: #ffffff;
  --hover-bg: rgba(79, 70, 229, 0.045);
  --dot: rgba(21, 23, 28, 0.13);
  --glow: rgba(79, 70, 229, 0.18);
  --max: 44rem;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
  --gradient: linear-gradient(100deg, var(--accent), var(--accent-2));
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0e13;
    --fg: #e7e9ee;
    --muted: #9aa2af;
    --line: #232833;
    --accent: #8f97f8;
    --accent-2: #38cfe6;
    --accent-soft: rgba(143, 151, 248, 0.1);
    --accent-2-soft: rgba(56, 207, 230, 0.07);
    --chip-bg: #141823;
    --hover-bg: rgba(143, 151, 248, 0.06);
    --dot: rgba(231, 233, 238, 0.1);
    --glow: rgba(143, 151, 248, 0.22);
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--fg);
  background:
    radial-gradient(42rem 26rem at 82% -10rem, var(--accent-soft), transparent 70%),
    radial-gradient(36rem 24rem at 8% -8rem, var(--accent-2-soft), transparent 70%),
    var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Dot grid, fading out down the page */
body::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 34rem;
  background-image: radial-gradient(var(--dot) 1px, transparent 1.5px);
  background-size: 22px 22px;
  -webkit-mask-image: linear-gradient(to bottom, black, transparent);
  mask-image: linear-gradient(to bottom, black, transparent);
  pointer-events: none;
}

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

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

a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

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

::selection {
  background: var(--accent);
  color: var(--bg);
}

/* Header */

.site-header {
  position: relative;
  padding: 1.4rem 0;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.monogram {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 9px;
  background: var(--gradient);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px var(--glow);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.monogram:hover {
  text-decoration: none;
  transform: rotate(-8deg) scale(1.08);
}

.site-nav {
  display: flex;
  gap: 1.4rem;
  font-family: var(--mono);
  font-size: 0.875rem;
}

.site-nav a {
  color: var(--muted);
}

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

.site-nav a[aria-current="page"] {
  color: var(--fg);
}

/* Main */

main {
  position: relative;
  flex: 1;
  padding: 3rem 0 4.5rem;
}

/* Hero */

.term {
  font-family: var(--mono);
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0 0 1.2rem;
  min-height: 1.4em;
}

.term .prompt {
  color: var(--accent-2);
  font-weight: 600;
  user-select: none;
}

.term .cmd::after {
  content: "▋";
  margin-left: 2px;
  color: var(--accent-2);
  animation: blink 1.1s steps(1) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.term-out {
  font-family: var(--mono);
  font-size: 0.875rem;
  color: var(--muted);
}

h1 {
  font-size: clamp(2.5rem, 8vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  font-size: 1.25rem;
  line-height: 1.55;
  color: var(--muted);
  margin: 0 0 2rem;
  max-width: 34em;
}

.tagline strong {
  color: var(--fg);
  font-weight: 600;
}

/* Section headings */

h2 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 3.25rem 0 1.1rem;
}

h2 .idx {
  color: var(--accent);
  font-weight: 700;
}

h2::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--line), transparent);
}

p {
  margin: 0 0 1rem;
}

/* Link chips */

.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0 0 0.5rem;
  padding: 0;
}

.chips a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--fg);
  background: var(--chip-bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  transition: border-color 0.15s ease, color 0.15s ease,
    box-shadow 0.15s ease, transform 0.15s ease;
}

.chips li:nth-child(odd) a:hover {
  transform: translateY(-2px) rotate(-1.5deg);
}

.chips li:nth-child(even) a:hover {
  transform: translateY(-2px) rotate(1.5deg);
}

.chips a:hover {
  text-decoration: none;
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 4px 16px var(--glow);
}

.chips svg {
  width: 0.95rem;
  height: 0.95rem;
  fill: currentColor;
  opacity: 0.85;
}

/* Tag list (interests) */

.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
}

.tags li {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--muted);
  background: var(--chip-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.4rem 0.8rem;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.tags li:hover {
  border-color: var(--accent-2);
  color: var(--fg);
  transform: translateY(-1px);
}

/* Entry lists (talks, papers) */

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

.entries > li {
  position: relative;
  padding: 1.1rem 1rem;
  margin: 0 -1rem;
  border-radius: 12px;
  transition: background-color 0.15s ease;
}

.entries > li + li {
  margin-top: 0.15rem;
}

.entries > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.4rem;
  bottom: 1.4rem;
  width: 2px;
  border-radius: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.15s ease;
}

.entries > li:hover {
  background: var(--hover-bg);
}

.entries > li:hover::before {
  opacity: 1;
}

.entry-title {
  font-weight: 600;
  margin: 0 0 0.2rem;
}

.entry-meta {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--muted);
  margin: 0;
}

.entry-links {
  font-family: var(--mono);
  font-size: 0.8125rem;
  margin: 0.4rem 0 0;
}

.entry-links a + a {
  margin-left: 1rem;
}

.more-link {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.875rem;
  margin-top: 1rem;
}

/* Footer */

.site-footer {
  position: relative;
  border-top: 1px solid var(--line);
  padding: 1.4rem 0 2rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--muted);
}

.site-footer .row {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  flex-wrap: wrap;
}

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

.site-footer a:hover {
  color: var(--accent);
}

.fingerprint {
  display: block;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  opacity: 0.75;
}

.fingerprint a {
  color: inherit;
}

.colophon {
  margin: 0.5rem 0 0;
  font-size: 0.75rem;
  opacity: 0.75;
}

#grin {
  font: inherit;
  color: var(--accent-2);
  background: none;
  border: none;
  padding: 0 0.15rem;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

#grin:hover {
  display: inline-block;
  transform: scale(1.4) rotate(10deg);
}

/* Entrance animation */

@media (prefers-reduced-motion: no-preference) {
  main .wrap > * {
    animation: rise 0.55s cubic-bezier(0.2, 0.6, 0.2, 1) both;
  }

  main .wrap > *:nth-child(2) { animation-delay: 0.05s; }
  main .wrap > *:nth-child(3) { animation-delay: 0.1s; }
  main .wrap > *:nth-child(4) { animation-delay: 0.15s; }
  main .wrap > *:nth-child(5) { animation-delay: 0.2s; }
  main .wrap > *:nth-child(6) { animation-delay: 0.25s; }
  main .wrap > *:nth-child(7) { animation-delay: 0.3s; }
  main .wrap > *:nth-child(8) { animation-delay: 0.35s; }
  main .wrap > *:nth-child(n+9) { animation-delay: 0.4s; }

  @keyframes rise {
    from {
      opacity: 0;
      transform: translateY(0.6rem);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}

/* 404 */

.center {
  text-align: center;
  padding-top: 3rem;
}

.center h1 {
  font-size: clamp(4rem, 14vw, 7rem);
}