/* =========================================================================
   bartulem.github.io -- single-page site
   Part 1: full-screen landing (globe canvas + identity block)
   Part 2: prose sections (about, publications) and footer
   All sizes in rem with a fluid root, so the page scales with the viewport.
   ========================================================================= */

:root {
  --bg: #07080d;
  --text: #d6d2c9;
  --text-strong: #ece8df;
  --text-dim: rgba(214, 210, 201, 0.55);
  --text-faint: rgba(214, 210, 201, 0.32);
  --rule: rgba(214, 210, 201, 0.12);
  --split: #5fb0dc;      /* Adriatic blue */
  --trondheim: #7fd8ae;  /* aurora green */
  --princeton: #f08a32;  /* Princeton orange */
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: clamp(1rem, 0.88rem + 0.4vw, 1.22rem);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  line-height: 1.65;
  overflow-x: hidden;
}

::selection { background: rgba(95, 176, 220, 0.35); color: var(--text-strong); }

a { color: inherit; }

/* --- Landing ------------------------------------------------------------- */

.hero {
  position: relative;
  height: 100vh;
  height: 100svh;
  min-height: 34rem;
  overflow: hidden;
}

.hero canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: block;
}

/* Name, field line, affiliation and links, centred over the globe */
.identity {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  width: max-content;
  max-width: 92vw;
}

/* Dark ellipse behind the identity so coastlines never cut through the name */
.identity::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 135%; height: 170%;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(7, 8, 13, 0.92) 0%, rgba(7, 8, 13, 0.7) 42%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* Brain emblem above the name */
.id-brain {
  position: relative;
  width: 6.6rem;
  margin-bottom: 0.8rem;
}

/* The emblem's layers: hemisphere bodies, then three brightness bands, all in
   the neutral text tone so that the emblem stays quiet next to the name */
.id-brain svg { display: block; width: 100%; height: auto; }
.id-brain .brain-body { color: rgba(214, 210, 201, 0.07); }
.id-brain .brain-band-1 { color: rgba(214, 210, 201, 0.30); }
.id-brain .brain-band-2 { color: rgba(214, 210, 201, 0.55); }
.id-brain .brain-band-3 { color: rgba(214, 210, 201, 0.85); }

/* A few blue points that glow gently, out of step with one another */
.id-brain .brain-dot { color: var(--split); animation: brain-glow 3.2s ease-in-out infinite; }
.id-brain .brain-dot-2 { animation-delay: -0.8s; }
.id-brain .brain-dot-3 { animation-delay: -1.7s; }
.id-brain .brain-dot-4 { animation-delay: -2.3s; }
.id-brain .brain-dot-5 { animation-delay: -1.2s; }

/* Signals: a short blue dash travelling along circuit traces of the left
   hemisphere. Each path has pathLength 100, so the dash is 10% of its trace;
   it starts just before the trace and ends just beyond it. */
.id-brain .brain-signal {
  color: var(--split);
  stroke-width: 7;
  stroke-dasharray: 10 100;
  stroke-dashoffset: 10;
  animation: brain-signal 5s linear infinite;
}

.id-brain .brain-signal-2 { animation-duration: 6.4s; animation-delay: -2.1s; }
.id-brain .brain-signal-3 { animation-duration: 4.4s; animation-delay: -3.0s; }
.id-brain .brain-signal-4 { animation-duration: 7.0s; animation-delay: -1.2s; }
.id-brain .brain-signal-5 { animation-duration: 5.6s; animation-delay: -4.1s; }
.id-brain .brain-signal-6 { animation-duration: 6.0s; animation-delay: -0.5s; }

/* Action potentials: soft blue rings that grow from a point of the right
   hemisphere and fade as they spread, colouring the swirls they pass over.
   Each ring is scaled about its own centre. */
/* The ring's gradient takes its colour from the gradient element, not from the circle that uses it */
.id-brain #brain-wave-ring { color: var(--split); }

.id-brain .brain-wave {
  transform-box: fill-box;
  transform-origin: center;
  transform: scale(0);
  opacity: 0;
  animation: brain-wave 4.2s ease-out infinite;
}

.id-brain .brain-wave-2 { animation-duration: 5.4s; animation-delay: -1.9s; }
.id-brain .brain-wave-3 { animation-duration: 6.3s; animation-delay: -4.0s; }

@keyframes brain-glow {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 1; }
}

@keyframes brain-signal {
  from { stroke-dashoffset: 10; }
  to { stroke-dashoffset: -100; }
}

@keyframes brain-wave {
  0% { transform: scale(0); opacity: 0; }
  6% { opacity: 0.95; }
  45% { transform: scale(1); opacity: 0; }
  100% { transform: scale(1); opacity: 0; }
}

/* The pool of words is kept in the page for the script and for screen
   readers, but not shown; the script rotates the words through the field line. */
.keywords {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  list-style: none;
}

.id-name {
  font: 400 2.8rem var(--serif);
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-strong);
  margin-bottom: 0.65rem;
  white-space: nowrap;
}

.id-fields {
  font: 500 0.7rem var(--sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--split);
  margin-bottom: 0.55rem;
}

/* The three words of the field line change over time (see js/landing.js).
   Each sits in a slot whose width eases to the new word's width, so the line
   re-centres smoothly; the word fades to the background colour, is replaced,
   and the new word's colour comes up. */
.id-fields { position: relative; white-space: nowrap; }

.field {
  display: inline-flex;
  justify-content: center;
  vertical-align: bottom;
  transition: width 0.3s ease;
}

.field-word {
  flex: none;
  display: inline-block;
  white-space: nowrap;
  transition: color 0.9s ease;
}

/* Faded: almost the background colour */
.field-word.dim { color: rgba(214, 210, 201, 0.1); }

/* Invisible copy of the type style, used by the script to measure words */
.field-ruler {
  position: absolute;
  left: 0; top: 0;
  visibility: hidden;
  white-space: nowrap;
  pointer-events: none;
}

.id-affiliation {
  font: 400 0.65rem var(--sans);
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-bottom: 1.1rem;
}

/* Row of profile icons (inline SVGs that take the link colour) */
.id-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.15rem;
}

.id-links a {
  display: block;
  line-height: 0;
  color: var(--text-dim);
  transition: color 0.3s ease, filter 0.3s ease;
}

.id-links svg { width: 1.05rem; height: 1.05rem; }

.id-links a:hover,
.id-links a:focus-visible {
  color: var(--text-strong);
  filter: drop-shadow(0 0 0.5rem rgba(236, 232, 223, 0.45));
}

/* City labels: real buttons, positioned over the canvas by the script */
.city {
  position: absolute;
  top: 0; left: 0;
  z-index: 4;
  padding: 0.5rem 0.7rem 1.5rem;
  background: none;
  border: 0;
  cursor: default;
  font: 500 0.58rem var(--sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  white-space: nowrap;
  transition: color 0.3s ease;
  will-change: transform;
}

.city:focus-visible { outline: 1px solid var(--text-faint); outline-offset: -0.3rem; }
.city[data-city="split"]:hover, .city[data-city="split"].active { color: var(--split); }
.city[data-city="trondheim"]:hover, .city[data-city="trondheim"].active { color: var(--trondheim); }
.city[data-city="princeton"]:hover, .city[data-city="princeton"].active { color: var(--princeton); }

/* Video of the two mice. Its background is black; "screen" blending makes
   black transparent, so the globe stays visible behind the animals. */
.scene-video {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  mix-blend-mode: screen;
  pointer-events: none;
}

/* Caption under the video; positioned by the script */
.scene-caption {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  width: min(30rem, 90vw);
  text-align: center;
  font: italic 400 0.72rem/1.4 var(--serif);
  color: var(--text-dim);
}

.scroll-cue {
  position: absolute;
  bottom: 1rem; left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  font: 400 0.9rem var(--sans);
  color: var(--text-faint);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  transition: color 0.3s ease;
}

.scroll-cue:hover { color: var(--text-strong); }

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

.prose {
  max-width: 44rem;
  margin: 0 auto;
  padding: 5rem 1.5rem 1rem;
}

.prose:last-child { padding-bottom: 5rem; }

/* A section that follows another sits closer to it than the first one sits to the landing screen */
.prose + .prose { padding-top: 2.2rem; }

.prose h2 {
  font: 500 0.7rem var(--sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--split);
  margin-bottom: 1.6rem;
}

.prose p { margin-bottom: 1.1rem; color: rgba(214, 210, 201, 0.88); }
.prose p.lead { font-size: 1.2rem; line-height: 1.5; color: var(--text-strong); }

.prose a {
  color: var(--text-strong);
  text-decoration: underline;
  text-decoration-color: var(--text-faint);
  text-underline-offset: 0.18em;
  transition: text-decoration-color 0.3s ease;
}

.prose a:hover { text-decoration-color: var(--text-strong); }

/* Line portrait beside the first paragraph */
.portrait {
  float: right;
  width: 12.5rem;
  margin: 0.2rem 0 0.8rem 2rem;
}

.portrait svg { display: block; width: 100%; height: auto; overflow: visible; }
.portrait path { vector-effect: non-scaling-stroke; }

/* The hair flutters all the time: each lock leans one way and back about its
   root roughly every half second. The locks have slightly different rhythms,
   so that they do not move in step. */
.portrait .portrait-hair {
  transform-box: fill-box;
  transform-origin: 50% 100%;
  animation: hair-flutter 0.5s ease-in-out infinite alternate;
}

.portrait .portrait-hair-2 { animation-duration: 0.56s; animation-delay: -0.2s; }
.portrait .portrait-hair-3 { animation-duration: 0.47s; animation-delay: -0.35s; }
.portrait .portrait-hair-4 { animation-duration: 0.6s; animation-delay: -0.1s; }

@keyframes hair-flutter {
  from { transform: skewX(-3.5deg) translateX(-0.6%); }
  to { transform: skewX(2.5deg) translateX(0.4%); }
}

/* Publications */
.pub {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  padding: 1.3rem 0;
  border-top: 1px solid var(--rule);
}

.pub-body { flex: 1 1 auto; min-width: 0; }
.prose .pub-title { color: var(--text-strong); font-size: 1.05rem; line-height: 1.4; margin-bottom: 0.4rem; }
.prose .pub-authors { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 0.3rem; }
.pub-authors b { color: var(--text-strong); font-weight: 600; }
.prose .pub-venue { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 0.6rem; }
.prose .pub-links { margin-bottom: 0; }

.pub-links { display: flex; flex-wrap: wrap; gap: 0.3rem 1rem; }

.pub-links a {
  font: 500 0.62rem var(--sans);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
}

.pub-links a:hover { color: var(--text-strong); }

.pub-badges {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 4rem;
}

/* Both badge embeds bring their own inline spacing; flatten it so the two circles share a centre line. */
.pub-badges > * { display: flex; align-items: center; line-height: 0; margin: 0; }
.pub-badges .__dimensions_Badge { margin: 0 !important; }
.pub-badges .altmetric-embed a, .pub-badges .altmetric-embed img { display: block; margin: 0; }

/* Dark versions of the citation badges. Neither service offers a dark theme,
   so the badges are inverted (white becomes black, dark digits become light)
   and their hues rotated back, which keeps the ring colours recognisable. */
.pub-badges .__dimensions_badge_embed__,
.pub-badges .altmetric-embed img {
  filter: invert(1) hue-rotate(180deg);
}

.prose .pub-note {
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* --- Simple message page (404, redirects) -------------------------------- */

.message {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem 1.5rem;
}

.message h1 { font: 400 2.2rem var(--serif); color: var(--text-strong); margin-bottom: 1rem; }
.message p { color: var(--text-dim); }
.message a { color: var(--text-strong); }

/* --- Small screens ------------------------------------------------------- */

@media (max-width: 768px) {
  html { font-size: clamp(0.9rem, 0.8rem + 0.5vw, 1.1rem); }
  .id-name { font-size: 2.1rem; }
  .id-fields { font-size: 0.6rem; letter-spacing: 0.1em; }
  .id-affiliation { font-size: 0.6rem; }
  .portrait { width: 8.5rem; margin: 0 0 0.5rem 1rem; }
  .id-brain { width: 5rem; margin-bottom: 0.6rem; }
  .prose { padding-top: 3.5rem; }
  .pub { flex-direction: column; gap: 0.6rem; }
  .pub-badges { min-height: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
  /* The emblem stays still: blue points shown, no travelling signals */
  .id-brain .brain-dot, .id-brain .brain-signal, .id-brain .brain-wave { animation: none; }
  .portrait .portrait-hair { animation: none; }
}