/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

body {
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Default MathJax block spacing */
mjx-container[display="true"] {
  display: block;
  margin: 0.8em 0; /* tighten vertical space */
}

/* Inline math stays inline, no extra gaps */
mjx-container:not([display="true"]) {
  display: inline-block;
  margin: 0 0.1em;
}

/* Tighten paragraph spacing globally (optional but recommended) */
p {
  margin-top: 0.6em;
  margin-bottom: 0.6em;
}

/* Optional: extra-tight spacing when equation follows a paragraph */
p + mjx-container[display="true"] {
  margin-top: 0.4em;
}

/* Optional: extra-tight spacing when paragraph follows equation */
mjx-container[display="true"] + p {
  margin-top: 0.4em;
}

/* CSS Variables for Light/Dark */
:root {
  --bg-color: #0f1724;
  --text-color: #e0e7ff;
  --accent-primary: #7c5cff;
  --accent-secondary: #00d4ff;
  --card-bg: rgba(15, 23, 36, 0.75);
  --btn-bg: #7c5cff;
  --btn-color: #fff;
  --btn-outline-border: #00d4ff;
  --shadow-primary: rgba(124, 92, 255, 0.7);
  --code-background: #1e293b;
  --code-textcolour: #f8f8f2;
  --code-copybtn-bg: #7c5cff;
  --pill_colour: #5b21b6;
}

body.light {
  --bg-color: #f0f4ff;
  --text-color: #1e293b;
  --accent-primary: #7c5cff;
  --accent-secondary: #0284c7;
  --card-bg: rgba(240, 244, 255, 0.9);
  --btn-bg: #5b21b6;
  --btn-color: #fff;
  --btn-outline-border: #0284c7;
  --shadow-primary: rgba(91, 33, 182, 0.7);
  --code-background: #5b21b6;
  --code-textcolour: #fff;
  --code-copybtn-bg: #7c5cff;
  --pill_colour: #0284c7;
}

/* Background Canvas fills viewport */
#background-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -10;
  pointer-events: none;
  display: block;
}

body.light a {
  color: #1a73e8;
  text-decoration: none;
}

body:not(.light) a {
  color: #92b6ee;
  text-decoration: none;
}

body.light a:hover,
body.light a:focus {
  color: #2815b6;
}

body:not(.light) a:hover,
body:not(.light) a:focus {
  color: #e4a1ff;
}

/* Header */
header {
  position: sticky;
  top: 0;
  background: var(--card-bg);
  backdrop-filter: saturate(180%) blur(16px);
  z-index: 1000;
  box-shadow: 0 2px 12px rgb(0 0 0 / 0.25);
}

.nav-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  font-size: 3rem;
  font-weight: 900;
  margin-bottom: 0.3rem;
  text-align: center;
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-weight: 600;
  font-size: 2rem;
  text-align: center;
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: var(--accent-secondary);
}

h3 {
  font-size: 1.5rem;
  color: var(--accent-primary);
}

p {
  font-size: 1.25rem;
  color: var(--text-color);
}

.logo {
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 0.05em;
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  user-select: none;
  cursor: default;
}

.logo a {
  text-decoration: none !important;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: color 0.25s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--accent-primary);
  outline-offset: 3px;
}

.theme {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

.theme a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: color 0.25s ease;
}

.theme a:hover,
.theme a:focus-visible {
  color: var(--accent-primary);
  outline-offset: 3px;
}
.theme button#theme-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.4rem;
  cursor: pointer;
  transition: color 0.3s ease;
  /* padding: 0.15rem; */
  display: flex;
  align-items: center;
}

.theme button#theme-toggle:hover,
.theme button#theme-toggle:focus-visible {
  color: var(--accent-secondary);
  outline-offset: 3px;
}

.theme button#theme-toggle span {
  pointer-events: none;
}

/* Hero Section */
.hero {
  max-width: 1080px;
  margin: 2rem auto 2rem auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  text-align: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 0;
}

.hero-content {
  flex: 1 1 300px;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 900;
  margin-bottom: 0.3rem;
  text-align: center;
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero h2 {
  font-weight: 600;
  font-size: 2rem;
  text-align: center;
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: var(--accent-secondary);
}

.hero h3 {
  font-size: 1.3rem;
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.hero p {
  font-size: 1.25rem;
  line-height: 1.6;
  margin-bottom: 1rem;
  text-align: center;
}

/* Paper Status */
.paper_status h3 {
  font-size: 1.5rem;
  color: var(--accent-secondary);
  margin: 0 auto 0.75rem auto;
}

/* Buttons */
.btn-outline {
  background: transparent;
  border: 2.5px solid var(--btn-outline-border);
  color: var(--btn-outline-border);
  line-height: 1;
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--btn-outline-border);
  color: #fff;
  transform: translateY(-3px);
  outline-offset: 3px;
}

/* Logos container */
.logos-container {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.logo-button span {
  display: inline-block;
  transition: color 0.2s;
  position: relative;
}

.logo-button img,
.logo-button span {
  transition: opacity 0.2s;
}

.hover-swap:hover img,
.hover-swap:hover span {
  opacity: 0;
}

.hover-swap::after {
  content: attr(data-hover);
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

.hover-swap:hover::after {
  opacity: 1;
}


/* Image container */
.image-container img {
  max-width: 75%;
  height: auto;
}

/* Half-image container */
.image-container-half-center {
  display: flex;
  justify-content: center;
}

.image-container-half-center img {
  width: 65%;
  height: auto;
  display: block;
}

/* Each logo "button" (pill) */
.logo-button {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  border-radius: 9999px;
  background-color: var(--pill_colour);
  text-decoration: none;
  color: inherit;
  font-weight: 500;
  font-size: 0.95rem;
  transition: background-color 0.25s ease, transform 0.25s ease;
}

.logo-button img {
  height: 24px;
  width: auto;
}

.logo-button span {
  color: #ffffff;
}

/* Hover/focus effects */
.logo-button:hover,
.logo-button:focus-visible {
  background-color: var(--pill_colour);
  transform: scale(1.1);
}

/* Sections */
.section {
  max-width: 1080px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.section h2 {
  font-weight: 900;
  font-size: 2.2rem;
  margin-bottom: 2rem;
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Visualisations */
#visualisations {
  margin: 1rem 0;
}

#visualisations video {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgb(0 0 0 / 0.2);
}

/* Key Takeaways Section */
.takeaways {
  max-width: 1200px;
  margin: 3rem auto 2rem;
  padding: 0 1.5rem;
  text-align: center;
}

.takeaways h2 {
  font-weight: 900;
  font-size: 2.2rem;
  margin-bottom: 2rem;
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Individual Card */
.card-single {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}

.card-individual {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 1.75rem 1.5rem;
  box-shadow: 0 4px 10px rgb(0 0 0 / 0.2);
  width: 100%;
  max-width: 1200px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: default;
}

.card-individual:hover,
.card-individual:focus-visible {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px var(--shadow-primary);
  outline-offset: 3px;
}

.card-individual h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  color: var(--accent-primary);
  font-weight: 700;
  font-size: 1.5rem;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  justify-items: center;
}

.cards-grid .card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 1.75rem 1.5rem;
  box-shadow: 0 4px 10px rgb(0 0 0 / 0.2);
  width: 100%;
  max-width: 1200px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: default;
}

.cards-grid .card:hover,
.cards-grid .card:focus-visible {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px var(--shadow-primary);
  outline-offset: 3px;
}

.cards-grid .card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  color: var(--accent-primary);
  font-weight: 700;
  font-size: 1.5rem;
}

/* Abstract */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.abstract {
  max-width: 1000px;
  margin: 3rem auto 2rem;
  padding: 0.1rem 0.1rem;
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: 0 8px 25px var(--shadow-primary);
  text-align: left;
}

.abstract h2 {
  text-align: center;
  display: block;
  width: 100%;
  margin-top: 0.75rem;
  color: var(--accent-secondary);
}

.abstract p {
  width: 93%;
  font-size: 1.25rem;
  line-height: 1.5;
  margin: 0 auto 2rem auto;
  color: var(--text-color);
  text-align: justify;
}

/* Learning Interactions */
.learning-interactions {
  max-width: 1200px;
  margin: 3rem auto 2rem;
  padding: 0.1rem 0.1rem;
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: 0 8px 25px var(--shadow-primary);
  text-align: left;
}

.learning-interactions h2 {
  text-align: center;
  display: block;
  width: 100%;
  margin-top: 0.75rem;
  color: var(--accent-secondary);
}

.learning-interactions p {
  width: 93%;
  font-family: Roboto, sans-serif;
  font-size: 1.25rem;
  line-height: 1.5;
  margin: 0 auto 2rem auto;
  color: var(--text-color);
  text-align: left;
}

/* Desiderata */
.desiderata {
  max-width: 1080px;
  margin: 3rem auto 2rem;
  padding: 0 1.5rem;
  text-align: center;
}

.desiderata h2 {
  font-weight: 900;
  font-size: 2.2rem;
  margin-bottom: 2rem;
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Forgetting & Self-Consistency */
.forgetting {
  max-width: 1280px;
  margin: 2rem auto 2rem;
  padding: 0.1rem 0.1rem;
  text-align: left;
}

.forgetting h2 {
  text-align: center;
  display: block;
  width: 100%;
  margin-top: 0.75rem;
  color: var(--accent-secondary);
}

.forgetting p {
  width: 93%;
  font-family: Roboto, sans-serif;
  font-size: 1.25rem;
  line-height: 1.5;
  margin: 0 auto 0 auto;
  color: var(--text-color);
  text-align: left;
}

.definition {
  width: 93%;
  padding: 1rem 1rem;
  margin: 1rem auto;
  position: relative;
  border-radius: 10px;
  background: var(--card-bg);
  box-shadow: 0 8px 25px var(--shadow-primary);
  color: var(--text-color);
}

.definition mjx-container[display="true"] {
  margin: 0.5em !important;
}

.definition p {
  width: auto;
}

/* Learning Interactions */
.analysis {
  max-width: 1200px;
  margin: 2rem auto 2rem;
  padding: 0.1rem 0.1rem;
  background: var(--card-bg);
  text-align: left;
}

.analysis h2 {
  text-align: center;
  display: block;
  width: 100%;
  margin-top: 0.75rem;
  color: var(--accent-secondary);
}

/* Analysis */
.image-row-responsive {
  display: flex;
  width: 100%;
}

.image-row-responsive .image-1,
.image-row-responsive .image-2 {
  flex: 1;
  display: flex;
}

.image-row-responsive img {
  width: 100%;
  height: auto;
  display: block;
}

/* Discussion */
.discussion {
  max-width: 1000px;
  margin: 3rem auto 2rem;
  padding: 0.1rem 0.1rem;
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: 0 8px 25px var(--shadow-primary);
  text-align: left;
}

.discussion h2 {
  text-align: center;
  display: block;
  width: 100%;
  margin-top: 0.75rem;
  color: var(--accent-secondary);
}

.discussion p {
  width: 93%;
  font-family: Roboto, sans-serif;
  font-size: 1.25rem;
  line-height: 1.5;
  margin: 0 auto 0 auto;
  color: var(--text-color);
  text-align: left;
}

/* Bibtex */
.bibtex {
  max-width: 1000px;
  margin: 2rem auto 2rem;
  padding: 0.1rem 3rem;
  background: var(--card-bg);
  text-align: left;
}

.bibtex h2 {
  text-align: center;
  display: block;
  color: var(--accent-secondary);
  width: 100%;
}

.bibtex h3 {
  text-align: center;
  display: block;
  width: 100%;
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
  font-weight: 900;

  background: linear-gradient(
    270deg,
    var(--accent-primary),
    var(--accent-secondary),
    var(--accent-primary)
  );
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.bibtex p {
  margin-top: 0;
}

.code-block {
  margin: 2.5%;
  width: 95%;
  position: relative;
  font-family: monospace;
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  background: var(--card-bg);
  box-shadow: 0 8px 25px var(--shadow-primary);
  color: var(--text-color);
}

/* Copy button in top-right */
.copy-btn {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  transition: background 0.2s ease;
}

.copy-btn:hover,
.copy-btn:focus-visible {
  background: rgba(0, 212, 255, 0.2);
}

.entry {
  margin-bottom: 1.75rem;
}

.entry:last-child {
  margin-bottom: 0;
}

.entry h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--accent-secondary);
}

.entry span {
  font-weight: 500;
  font-style: italic;
  color: var(--text-color-alt);
  display: block;
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.9rem;
  color: var(--accent-secondary);
}

/* Accessibility focus */
a:focus-visible,
button:focus-visible,
input:focus-visible,
.card:focus-visible,
.pub-item:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: 3px;
  outline-style: solid;
}

/* Responsive */
@media (max-width: 768px) {
  body,
  .hero p,
  .abstract p,
  .discussion p,
  .learning-interactions p,
  .forgetting p,
  .desiderata p,
  .takeaways p,
  .analysis p,
  .cards-grid .card,
  .card-individual,
  .bibtex,
  .code-block {
    font-size: 0.95rem !important; /* slightly smaller for mobile */
    line-height: 1.4 !important;
  }
  mjx-container {
    font-size: 1em !important;
  }

  /* Keep hero/image text bigger for impact */
  .hero h1 { font-size: 2.5rem !important; margin-top: 0 !important; }
  .hero h2 { font-size: 1.5rem !important; }
  .hero h3 { font-size: 1.2rem !important; }
  .hero p  { font-size: 1rem !important; }

  /* Make all main containers full width and centered */
  .hero,
  .hero-content,
  .cards-grid,
  .cards-grid .card,
  .card-individual,
  .section,
  .abstract,
  .discussion,
  .learning-interactions,
  .forgetting,
  .desiderata,
  .takeaways,
  .image-row-responsive,
  .image-container-half-center,
  .logos-container,
  .bibtex,
  .code-block {
    width: 100% !important;
    max-width: 100% !important;
    margin: 1rem auto !important;
    padding-left: 1rem !important;
    padding-right: 1rem !important;
    box-sizing: border-box;
    text-align: center; /* Default for most containers */
  }

  /* Stack flex/grid content vertically */
  .hero,
  .cards-grid,
  .image-row-responsive,
  .image-container-half-center {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
  }

  /* Cards single column */
  .cards-grid {
    display: grid !important;
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }

  /* Images scale properly */
  .image-row-responsive img,
  .image-container-half-center img,
  .image-container img {
    width: 100% !important;
    max-width: 100% !important;
    height: auto !important;
    display: block;
    margin: 0 auto;
  }

  /* Force first image full width */
  .image-container-half-center img:first-child {
    width: 100% !important;
    height: auto !important;
  }

  /* Section paragraphs full width and justified (not ragged) */
  .abstract p,
  .discussion p,
  .learning-interactions p,
  .forgetting p {
    width: 100% !important;
    text-align: justify !important;
    text-align-last: left !important;
    margin: 0 0 1rem 0 !important;
  }

  /* Footer full width */
  footer {
    width: 100% !important;
    padding: 1rem !important;
  }

  /* Code blocks / BibTeX - adjusted vertical padding */
  .bibtex .code-block,
  .code-block {
    width: 100% !important;
    max-width: 100% !important;
    max-height: 100px !important;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
    padding: 1rem 0.75rem !important;
    box-sizing: border-box;
  }

  /* MathJax equations */
  mjx-container[display="true"] {
    display: block !important;
    width: 100% !important;
    overflow-x: auto;
    word-wrap: break-word;
  }
  mjx-container:not([display="true"]) {
    display: inline-block !important;
    max-width: 100% !important;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  /* Logo buttons wrap */
  .logo-button {
    flex-wrap: wrap !important;
    justify-content: center !important;
    width: auto !important;
  }

  /* Hide nav links */
  .nav-links { display: none !important; }
}

/* Small phones */
@media (max-width: 480px) {

  /* Further reduce font size for very small screens */
  body,
  .hero p,
  .abstract p,
  .discussion p,
  .learning-interactions p,
  .forgetting p,
  .desiderata p,
  .takeaways p,
  .cards-grid .card,
  .card-individual,
  .bibtex,
  .code-block {
    font-size: 0.9rem !important;
    line-height: 1.35 !important;
  }

  .hero h1 { font-size: 2.2rem !important; }
  .hero h2 { font-size: 1.2rem !important; }
  .hero p  { font-size: 0.95rem !important; }

  /* Reduce padding slightly */
  .abstract,
  .discussion,
  .learning-interactions,
  .forgetting,
  .desiderata,
  .takeaways,
  .cards-grid .card,
  .card-individual,
  .bibtex,
  .code-block {
    padding-left: 0.75rem !important;
    padding-right: 0.75rem !important;
  }

  /* Images full width */
  .image-container-half-center img:first-child,
  .image-container img {
    width: 100% !important;
    height: auto !important;
  }

  /* Section text stays justified on small screens */
  .abstract p,
  .discussion p,
  .learning-interactions p,
  .forgetting p {
    text-align: justify !important;
    text-align-last: left !important;
    width: 100% !important;
    margin: 0 0 0.75rem 0 !important;
  }

  /* Code block vertical padding for small phones */
  .bibtex .code-block,
  .code-block {
    padding: 0.9rem 0.75rem !important;
  }
}