/* ── Reset & Base ─────────────────────────────────────────────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Space Invaders Palette — Black, logo green, stark white */
  --bg-primary: #000000;
  --bg-secondary: #080808;

  --text-primary: #ffffff;
  --text-secondary: #aaaaaa;
  --text-muted: #888888;

  --accent: #6aba79;
  --accent-rgb: 106, 186, 121;
  --accent-hover: color-mix(in srgb, var(--accent), white 15%);

  --border: #222222;

  --font-sans: "Inter", system-ui, sans-serif;
  --font-retro: "Silkscreen", "JetBrains Mono", monospace;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;

  --max-width: 1120px;

  /* Sharp edges and snappy transitions for a retro feel */
  --transition-fast: 0.1s steps(2);
  --transition-base: 0.2s steps(4);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  /* Retro CRT scanline hint */
  background-image: linear-gradient(
    rgba(0, 0, 0, 0) 50%,
    rgba(0, 0, 0, 0.2) 50%
  );
  background-size: 100% 4px;
}

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 200;
  padding: 0.75rem 1rem;
  color: var(--bg-primary);
  background: var(--accent);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.page-wrapper {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  min-width: 0;
}

.about__text a,
.project-callout a:not(.btn) {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.about__text a:hover,
.project-callout a:not(.btn):hover {
  color: var(--accent-hover);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-retro);
  text-transform: uppercase;
}

/* ── Navigation ──────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--border);
}

.nav__logo {
  font-family: var(--font-retro);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
}

.nav__logo-symbol {
  color: var(--accent);
  font-size: 2.25rem;
}

.nav__logo-image {
  display: block;
  height: 3rem;
  width: auto;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__link {
  font-family: var(--font-retro);
  font-size: 1rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  transition: color var(--transition-fast);
}

.nav__link:hover {
  color: var(--accent-hover);
}

.nav__link--cta {
  padding: 0.5rem 1rem;
  border: 2px solid var(--accent);
  color: var(--accent);
  transition: all var(--transition-fast);
}

.nav__link--cta:hover {
  background: var(--accent);
  color: #000;
}

/* ── Hero ─────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
  overflow: hidden;
  /* Retro dot grid */
  background-image: radial-gradient(var(--border) 2px, transparent 2px);
  background-size: 32px 32px;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 1000px;
  width: 100%;
  background: var(--bg-primary);
  padding: var(--space-md) var(--space-lg);
  border: 4px solid var(--border);
  box-shadow: 8px 8px 0 var(--border);
}

.hero__content--highlight {
  border-color: var(--accent);
  box-shadow: 8px 8px 0 var(--accent);
}

.hero--error {
  --accent: #ef4444;
  --accent-rgb: 239, 68, 68;
}

.hero .hero__about {
  margin-bottom: var(--space-md);
}

.hero__eyebrow {
  font-family: var(--font-retro);
  color: var(--accent);
  margin-bottom: var(--space-md);
  letter-spacing: 2px;
}

.hero__title {
  font-size: clamp(1.5rem, 4vw, 3rem);
  line-height: 1.1;
  margin-bottom: var(--space-md);
}

.hero__title--accent {
  color: var(--accent);
  text-shadow: 2px 2px 0 rgba(var(--accent-rgb), 0.4);
}

.hero__subtitle {
  font-size: 1.4rem;
  color: var(--text-secondary);
  font-weight: 500;
  letter-spacing: 0.5px;
  max-width: 600px;
  margin: 0 auto var(--space-md);
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-retro);
  font-size: 0.85rem;
  padding: 0.8rem 1.5rem;
  border: 2px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  text-transform: uppercase;
  transition: all var(--transition-fast);
  box-shadow: 4px 4px 0 rgba(var(--accent-rgb), 0.2);
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--accent);
}

.btn--primary {
  background: var(--accent);
  color: #000;
  box-shadow: 4px 4px 0 rgba(255, 255, 255, 0.2);
}

.btn--primary:hover {
  background: #fff;
  color: #000;
  border-color: #fff;
  box-shadow: 6px 6px 0 var(--accent);
}

.btn--lg {
  font-size: 1rem;
  padding: 1rem 2rem;
}

/* ── Sections ────────────────────────────────────────────────── */
.section {
  padding: var(--space-xl) var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section--alt {
  max-width: 100%;
  background: var(--bg-secondary);
  border-top: 2px dashed var(--border);
  border-bottom: 2px dashed var(--border);
}

.section--alt > * {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__heading {
  color: var(--accent);
  margin-bottom: var(--space-lg);
  font-size: 1.5rem;
  text-align: center;
  letter-spacing: 1px;
}

.section__heading::before,
.section__heading::after {
  content: " = ";
  color: var(--border);
}

.content-section {
  padding-bottom: var(--space-lg);
}

.content-container {
  max-width: 800px;
  text-align: left;
}

.content-title {
  text-align: left;
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  margin-bottom: var(--space-md);
  overflow-wrap: anywhere;
}

.page-date {
  color: var(--text-muted);
  font-size: 0.9em;
  margin-bottom: var(--space-sm);
}

.page-date--article {
  margin-bottom: var(--space-md);
}

/* ── Cards ───────────────────────────────────────────────────── */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.card {
  padding: var(--space-md);
  background: var(--bg-primary);
  border: 2px solid var(--border);
  box-shadow: 4px 4px 0 var(--border);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--accent);
  box-shadow: 8px 8px 0 var(--accent);
  transform: translate(-4px, -4px);
}

.card__icon {
  font-family: var(--font-retro);
  font-size: 2rem;
  margin-bottom: var(--space-sm);
  color: var(--accent);
}

.card__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0;
}

.cards--list {
  display: flex;
  flex-direction: column;
}

.card--list {
  text-align: left;
}

.card__title--list {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
  overflow-wrap: anywhere;
}

.card__link {
  margin-top: var(--space-sm);
}

.team {
  max-width: 900px;
}

.cards--team {
  grid-template-columns: repeat(auto-fit, minmax(min(180px, 100%), 1fr));
  gap: 1.5rem;
}

.card--team {
  padding: 1.5rem 1rem;
  text-align: center;
  container-type: inline-size;
}

.team__name {
  display: flex;
  justify-content: center;
  gap: 0.3em;
}

@container (max-width: 250px) {
  .team__name {
    flex-direction: column;
    gap: 0;
  }
}

.team__role {
  margin: 0.5rem 0;
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.team__affiliation {
  font-size: 0.85em;
  margin-bottom: var(--space-sm);
}

.project-callout {
  text-align: center;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

.project-callout__text {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: var(--space-sm);
}

.project-callout__button {
  margin-top: 0.5rem;
}

.card__text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.about__text {
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto var(--space-lg);
  text-align: justify;
  font-size: 1.1rem;
}

.about__text p {
  margin-bottom: 1.5rem;
}

.about__text p:last-child {
  margin-bottom: 0;
}

.prose {
  line-height: 1.6;
}

.prose ul,
.prose ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.prose h2,
.prose h3 {
  color: var(--text-primary);
  margin: 2rem 0 1rem;
}

/* Reserved for the future research and stats sections. */

.about__stats {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.stat {
  text-align: center;
  padding: var(--space-md);
  border: 2px solid var(--border);
  background: var(--bg-primary);
  min-width: 180px;
}

.stat__value {
  display: block;
  font-family: var(--font-retro);
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.stat__label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* ── CTA ─────────────────────────────────────────────────────── */
.cta {
  text-align: center;
  padding: var(--space-lg) 0;
  border: 4px solid var(--accent);
  background: repeating-linear-gradient(
    45deg,
    rgba(var(--accent-rgb), 0.05),
    rgba(var(--accent-rgb), 0.05) 10px,
    transparent 10px,
    transparent 20px
  );
}

.cta__title {
  margin-bottom: var(--space-sm);
}

.cta__text {
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto var(--space-md);
}

/* ── Footer ──────────────────────────────────────────────────── */
.footer {
  text-align: center;
  padding: var(--space-md);
  color: var(--text-muted);
  font-family: var(--font-retro);
  font-size: 0.7rem;
  border-top: 2px solid var(--border);
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 640px) {
  html {
    scroll-padding-top: 9rem;
  }
  .hero__content {
    border-width: 2px;
    box-shadow: 4px 4px 0 var(--border);
    padding: var(--space-md);
  }

  .nav {
    flex-wrap: wrap;
    justify-content: center;
    padding: var(--space-xs);
    gap: var(--space-xs);
  }

  .nav__logo {
    font-size: 1.2rem;
  }

  .nav__logo-image {
    height: 2.5rem;
    width: auto;
  }

  .nav__logo-symbol {
    font-size: 1.8rem;
  }

  .nav__links {
    gap: var(--space-xs) var(--space-sm);
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav__link {
    font-size: 0.8rem;
  }

  .nav__link--cta {
    padding: 0.3rem 0.6rem;
  }

  .nav--simple {
    justify-content: center;
  }

  .card--list {
    padding: var(--space-sm);
  }

  .cta {
    padding: var(--space-md) var(--space-sm);
  }

  .btn--lg {
    font-size: 0.85rem;
    padding: 1rem;
  }
}

/* ── Atoms Animation ─────────────────────────────────────────── */
#atoms-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.atom {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  opacity: 0.4;
  background-color: var(--accent);
  /* Animate movement across screen and Rydberg excitation */
  animation:
    moveAtom var(--duration) linear infinite alternate,
    glowRydberg 15s infinite var(--glow-delay);
  will-change: transform, background-color, box-shadow, opacity;
}

@keyframes moveAtom {
  0% {
    transform: translate(var(--startX), var(--startY));
  }
  100% {
    transform: translate(var(--endX), var(--endY));
  }
}

@keyframes glowRydberg {
  0%,
  90%,
  100% {
    background-color: var(--accent);
    box-shadow: none;
    opacity: 0.4;
    z-index: 0;
  }
  93%,
  97% {
    background-color: #fff;
    box-shadow:
      0 0 10px 4px rgba(var(--accent-rgb), 0.8),
      0 0 20px 8px rgba(var(--accent-rgb), 0.4);
    opacity: 0.9;
    z-index: 10;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .btn:hover,
  .card:hover {
    transform: none;
  }
}