:root {
  --header-height: 200px;
  --sprite-height: 146px;
  --sprite-width: 220px;
  --sprite-font-size: 5px;
  --game-hud-font-size: 10px;
  --sprite-scale: 1;
  --title-font-size: 5px;
  --title-scale: 1;
  --ink: #171717;
  --paper: #ffffff;
  --rule: #d8d8d8;
  --link: #0645ad;
  --visited: #0b0080;
  --muted: #555555;
  --panel: #ffffff;
  --button: #f5f5f5;
  --button-border: #b8b8b8;
  --header-height-total: var(--header-height);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f0f0f0;
    --paper: #2c2c2c;
    --rule: #555555;
    --link: #80b3ff;
    --visited: #b99cff;
    --muted: #bbbbbb;
    --panel: #2c2c2c;
    --button: #3a3a3a;
    --button-border: #666666;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height-total);
}

body {
  margin: 0;
  padding-top: var(--header-height-total);
  color: var(--ink);
  background: var(--paper);
  font-family: Georgia, "Times New Roman", Times, serif;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:visited {
  color: var(--visited);
}

.site-header {
  position: fixed;
  z-index: 10;
  top: 0;
  right: 0;
  left: 0;
  height: var(--header-height);
  background: var(--paper);
  border-bottom: 1px dotted var(--rule);
}

.sprite-track {
  position: relative;
  height: var(--sprite-height);
  overflow: hidden;
  border-bottom: 1px dotted var(--rule);
}

.sprite-track.is-game {
  cursor: pointer;
}

.site-title {
  position: absolute;
  z-index: 2;
  top: 10px;
  left: 20px;
  max-width: calc(100vw - 40px);
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  font-family: Arial, sans-serif;
  font-size: var(--title-font-size);
  line-height: 1.34;
  white-space: pre;
  transform: scale(var(--title-scale));
  transform-origin: top left;
  pointer-events: none;
  user-select: none;
}

.sprite {
  position: absolute;
  z-index: 6;
  bottom: 0;
  left: 0;
  width: var(--sprite-width);
  height: var(--sprite-height);
  cursor: pointer;
  will-change: transform;
}

.sprite-frame {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: max-content;
  min-width: 1px;
  margin: 0;
  color: var(--ink);
  font-family: Arial, sans-serif;
  font-size: var(--sprite-font-size);
  line-height: 1.34;
  white-space: pre;
  transform: translateX(-50%) scale(var(--sprite-scale))
    scaleX(var(--facing, 1));
  transform-origin: bottom center;
  user-select: none;
}

.game-ground,
.game-over-art,
.game-over-prompt,
.game-object-art {
  margin: 0;
  color: var(--ink);
  font-family: Arial, sans-serif;
  font-size: var(--sprite-font-size);
  line-height: 1.34;
  white-space: pre;
  user-select: none;
}

.game-score,
.game-exit {
  margin: 0;
  color: var(--ink);
  font-family: Arial, sans-serif;
  font-size: var(--game-hud-font-size);
  line-height: 1.18;
  white-space: pre;
  user-select: none;
}

.game-ground,
.game-layer,
.game-hud,
.game-over {
  display: none;
  pointer-events: none;
}

.sprite-track.is-game .game-ground,
.sprite-track.is-game .game-layer,
.sprite-track.is-game .game-hud {
  display: block;
}

.game-layer {
  position: absolute;
  z-index: 4;
  inset: 0;
}

.game-object {
  position: absolute;
  left: 0;
  will-change: transform;
}

.game-cloud {
  z-index: 1;
  opacity: 0.5;
}

.game-bird {
  z-index: 2;
  opacity: 0.85;
}

.game-obstacle {
  z-index: 5;
}

.game-ground {
  position: absolute;
  z-index: 5;
  right: -100vw;
  bottom: 0;
  left: 0;
  overflow: hidden;
}

.game-hud {
  position: absolute;
  z-index: 8;
  top: 8px;
  left: 16px;
  text-align: left;
}

.game-exit {
  margin-top: 6px;
}

.sprite-track.is-game-over .game-over {
  display: block;
}

.game-over {
  position: absolute;
  z-index: 9;
  top: 50%;
  left: 50%;
  max-width: calc(100vw - 32px);
  overflow: hidden;
  text-align: center;
  transform: translate(-50%, -50%);
}

.game-over-art,
.game-over-prompt {
  display: block;
  width: max-content;
  max-width: 100%;
  overflow: hidden;
  text-align: left;
}

.game-over-prompt {
  margin: 8px auto 0;
  text-align: center;
}

.site-nav {
  display: flex;
  gap: 24px;
  justify-content: space-between;
  align-items: center;
  width: min(1000px, calc(100vw - 32px));
  height: calc(var(--header-height) - var(--sprite-height));
  margin: 0 auto;
  padding: 0;
  font-size: 0.95rem;
  letter-spacing: 0;
  text-transform: none;
}

.nav-links,
.language-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(28px, 5vw, 84px);
  align-items: center;
}

.language-switcher {
  justify-content: flex-end;
  gap: 12px;
}

.site-nav a {
  color: var(--link);
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a:focus {
  text-decoration: underline;
}

.lang-btn {
  padding: 0;
  color: var(--link);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0;
  font-size: 0.86rem;
  line-height: 1.2;
  text-decoration: none;
  text-underline-offset: 3px;
}

.lang-btn:hover,
.lang-btn:focus {
  text-decoration: underline;
}

.lang-btn.active {
  color: var(--ink);
  background: transparent;
  border-color: transparent;
  font-weight: 700;
  text-decoration: underline;
}

.page-shell {
  width: min(1000px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 0 0 64px;
}

.page-section,
.secret-clue {
  padding-left: 0;
}

.page-section p {
  max-width: 76ch;
}

.page-section {
  padding-top: 18px;
  margin-top: 38px;
  border-top: 1px dotted var(--rule);
}

.page-section:first-child {
  padding-top: 28px;
  margin-top: 0;
  border-top: 0;
}

#research p {
  margin-top: 0;
  margin-bottom: 1.05em;
}

#research ul {
  margin-top: 0.15em;
  margin-bottom: 1.1em;
}

#research li {
  margin-bottom: 0.45em;
}

.page-section h2 {
  margin: 0 0 12px;
  font-size: 1.25rem;
  font-weight: 700;
}

.page-section h2 a {
  color: var(--link);
  text-decoration: none;
}

.page-section h2 a:hover,
.page-section h2 a:focus {
  text-decoration: underline;
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  gap: 44px;
  align-items: start;
}

.about-photo {
  display: block;
  width: 100%;
  max-height: 230px;
  object-fit: cover;
}

.about-photo-wrap {
  position: relative;
  width: 100%;
}

.research-statement {
  max-width: 78ch;
  font-size: 1.05rem;
}

.entry-list {
  display: grid;
  gap: 18px;
}

.entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 22px;
  align-items: center;
  padding: 14px 0;
  border-top: 1px dotted var(--rule);
}

.entry:first-child {
  border-top: 0;
}

.entry h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.publication-list {
  max-width: 82ch;
  margin: 0;
  padding-left: 22px;
}

.publication-list li {
  margin-bottom: 12px;
}

.publication-list strong,
.publication-authors {
  display: block;
}

.inline-links {
  display: inline-flex;
  gap: 12px;
  margin-left: 8px;
}

.entry img {
  width: 100%;
  max-height: 150px;
  object-fit: contain;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0 22px;
}

.profile-links {
  justify-content: center;
  gap: 0 14px;
  margin: 9px 0 0;
  font-size: 0.92rem;
}

.secret-letter-target {
  color: inherit;
  text-decoration: inherit;
  cursor: inherit;
  outline: 0;
  -webkit-tap-highlight-color: transparent;
}

.secret-clue {
  position: relative;
  margin-top: 42px;
  padding-bottom: 24px;
  color: var(--ink);
  text-align: center;
}

.last-updated {
  margin: 0 0 1px;
  color: var(--ink);
}

.tool-body {
  padding-top: 0;
}

.tool-shell {
  width: min(900px, calc(100vw - 32px));
  margin: 34px auto 70px;
}

.tool-shell h1 {
  margin: 12px 0 18px;
  font-size: 1.5rem;
}

.secret-title {
  max-width: 100%;
  margin: 0 0 18px;
  overflow: hidden;
  color: var(--ink);
  font-family: Arial, sans-serif;
  font-size: var(--sprite-font-size);
  line-height: 1.34;
  white-space: pre;
}

.tool-list {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.tool-panel {
  display: grid;
  gap: 14px;
  width: min(680px, 100%);
  padding-top: 12px;
  border-top: 1px dotted var(--rule);
}

.tool-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

input[type="text"] {
  min-width: min(360px, 100%);
  flex: 1;
  padding: 7px 8px;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--button-border);
  border-radius: 0;
  font: inherit;
}

button {
  color: var(--ink);
  background: var(--button);
  border: 1px solid var(--button-border);
  border-radius: 0;
  font: inherit;
  cursor: pointer;
}

.secret-clue-button {
  padding: 0;
  color: var(--muted);
  opacity: 0.34;
  background: transparent;
  border: 0;
  border-radius: 0;
  font: inherit;
  font-size: 0.48rem;
  line-height: 1;
  cursor: pointer;
}

.secret-clue-button:hover,
.secret-clue-button:focus {
  opacity: 0.58;
}

.tool-panel button {
  padding: 7px 10px;
}

.qr-output {
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.qr-output canvas,
.qr-output img {
  padding: 12px;
  background: #ffffff;
}

.stopwatch-time {
  font-family: Arial, sans-serif;
  font-size: 3rem;
  line-height: 1;
}

.split-list {
  margin: 8px 0 0;
  padding-left: 24px;
}

@media (max-width: 820px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .about-photo-wrap {
    order: -1;
    justify-self: center;
    width: min(190px, 100%);
  }

  .about-photo {
    max-height: 230px;
  }
}

@media (max-width: 540px) {
  :root {
    --header-height: 156px;
    --sprite-height: 126px;
    --sprite-width: 160px;
    --game-hud-font-size: 8px;
    --sprite-scale: 0.58;
    --title-font-size: 3.25px;
    --title-scale: 1;
  }

  .site-title {
    top: -4px;
    left: 8px;
    max-width: calc(100vw - 16px);
  }

  .site-nav {
    justify-content: space-between;
    align-content: center;
    width: calc(100vw - 32px);
    gap: 8px 14px;
    padding: 0;
    font-size: 0.72rem;
  }

  .nav-links {
    gap: 7px 16px;
  }

  .language-switcher {
    gap: 8px;
  }

  .lang-btn {
    padding: 0;
    font-size: 0.68rem;
  }

  .page-section:first-child {
    padding-top: 12px;
  }

  .page-section h2 {
    font-size: 1.2rem;
  }

  .research-statement {
    font-size: 1rem;
  }

  .about-layout,
  .entry {
    grid-template-columns: 1fr;
  }

  .about-photo {
    max-width: 190px;
    justify-self: start;
  }

  .about-photo-wrap {
    width: 190px;
    max-width: 100%;
  }

  .entry img {
    max-width: 260px;
    justify-self: start;
  }

  .stopwatch-time {
    font-size: 2.3rem;
  }
}