/* Design tokens */
:root {
  --bg: #0b1220;
  --bg-elev: #0f172a;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #0ea5e9;
  --primary-2: #38bdf8;
  --accent: #22d3ee;
  --card: #0b1220;
  --border: #1f2937;
  --chip: #0b2a33;
}
:root.light {
  --bg: #f8fafc;
  --bg-elev: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #0369a1;
  --primary-2: #0284c7;
  --accent: #0891b2;
  --card: #ffffff;
  --border: #e2e8f0;
  --chip: #e0f2fe;
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font: 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell,
    Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(
      1200px 600px at 10% -10%,
      rgba(56, 189, 248, 0.15),
      transparent 40%
    ),
    radial-gradient(
      1000px 500px at 100% 0%,
      rgba(34, 211, 238, 0.12),
      transparent 40%
    ),
    var(--bg);
}
img {
  max-width: 100%;
  display: block;
}
.container {
  width: min(1100px, 92%);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--bg-elev);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
}

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 18, 32, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
}
.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.nav {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
}
.nav a:hover {
  color: var(--text);
  background: rgba(56, 189, 248, 0.08);
}
.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.nav-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
}

.button {
  --_bg: var(--primary);
  --_bg2: var(--primary-2);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  border-radius: 0.6rem;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--_bg), var(--_bg2));
  color: white;
  text-decoration: none;
  font-weight: 600;
}
.button:hover {
  filter: brightness(1.05);
}
.button--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.button--icon {
  background: transparent;
  border: 1px solid var(--border);
  padding: 0.45rem 0.6rem;
}

.hero {
  padding: 5rem 0 3rem;
  border-bottom: 1px solid var(--border);
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
}
.lead {
  color: var(--muted);
  font-size: 1.1rem;
}
.cta {
  display: flex;
  gap: 0.75rem;
  margin: 1rem 0 1.25rem;
}
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.badge {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.85rem;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 1rem;
  overflow: hidden;
}
.card__body {
  padding: 1rem 1.25rem;
}

.section {
  padding: 3rem 0;
}
.section--alt {
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.06), transparent);
}
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.25rem;
}
.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}
.tile {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  padding: 1rem;
}
.tile h3 {
  margin-top: 0.25rem;
}

.resource-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
.resource {
  display: block;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 0.9rem 1rem;
  border-radius: 0.6rem;
  color: var(--text);
  text-decoration: none;
}
.resource:hover {
  border-color: var(--primary-2);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}
.chip {
  background: var(--chip);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 1rem 0;
  background: rgba(11, 18, 32, 0.6);
  backdrop-filter: blur(8px);
}
.footer__inner {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.footer__links {
  display: flex;
  gap: 0.75rem;
}
.footer a {
  color: var(--muted);
  text-decoration: none;
}
.footer a:hover {
  color: var(--text);
}

@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
  }
  .grid {
    grid-template-columns: 1fr;
  }
  .grid--2 {
    grid-template-columns: 1fr;
  }
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .resource-categories {
    grid-template-columns: 1fr;
  }
  .quick-link-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .resource-list {
    grid-template-columns: 1fr;
  }
  .nav {
    position: fixed;
    inset: 56px 0 auto 0;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    display: none;
    flex-direction: column;
  }
  .nav.show {
    display: flex;
  }
  .nav-toggle {
    display: block;
  }
}

@media (max-width: 600px) {
  .quick-link-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* Performance metrics styling */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}
.metric-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  text-align: center;
}
.metric-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0.5rem 0;
}
.metric-label {
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 1rem;
}
.metric-details {
  list-style: none;
  padding: 0;
  text-align: left;
}
.metric-details li {
  padding: 0.25rem 0;
  color: var(--text);
  font-size: 0.9rem;
}

.experiments-section {
  margin-top: 3rem;
}
.experiments-section h3 {
  margin-bottom: 1.5rem;
}

/* Resources styling */
.resource-categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2rem;
}
.resource-category h3 {
  margin-bottom: 1rem;
  color: var(--primary);
}

.quick-links {
  margin-top: 2rem;
}
.quick-links h3 {
  margin-bottom: 1rem;
}
.quick-link-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.quick-link {
  display: block;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: 0.8rem;
  text-decoration: none;
  text-align: center;
}
.quick-link strong {
  display: block;
  color: var(--primary);
  margin-bottom: 0.5rem;
}
.quick-link span {
  color: var(--muted);
  font-size: 0.85rem;
}
.quick-link:hover {
  border-color: var(--primary-2);
}

/* Team section styling */
.team-info {
  display: grid;
  gap: 2rem;
  margin-bottom: 2rem;
}
.team-section h3 {
  color: var(--primary);
  margin-bottom: 1rem;
}
.team-members,
.supervisors {
  display: grid;
  gap: 0.75rem;
}
.member,
.supervisor {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: 0.6rem;
}
.member strong,
.supervisor strong {
  display: block;
  color: var(--text);
  margin-bottom: 0.25rem;
}
.member span,
.supervisor span {
  color: var(--muted);
  font-size: 0.9rem;
}

.project-stats {
  margin: 2rem 0;
}
.project-stats h3 {
  margin-bottom: 1rem;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.stat {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: 0.8rem;
  text-align: center;
}
.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}
.stat-label {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.technology-stack {
  margin-top: 2rem;
}
.technology-stack h3 {
  margin-bottom: 1rem;
}

/* Architecture overview section */
.architecture-overview {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 1rem;
}
.architecture-overview h3 {
  color: var(--primary);
  margin-bottom: 1rem;
}
.overview-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: 0.8rem;
}
.overview-card h4 {
  color: var(--primary-2);
  margin-bottom: 0.75rem;
}
.overview-card ul {
  margin: 0;
}
.overview-card li {
  margin: 0.5rem 0;
  color: var(--text);
}

/* Technical specifications section */
.technical-specs {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 1rem;
}
.technical-specs h3 {
  color: var(--primary);
  margin-bottom: 1rem;
}
.spec-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: 0.8rem;
}
.spec-card h4 {
  color: var(--primary-2);
  margin-bottom: 0.75rem;
}
.spec-card ul {
  margin: 0;
}
.spec-card li {
  margin: 0.5rem 0;
  color: var(--text);
  font-size: 0.95rem;
}

/* Problem statement and objectives */
.problem-statement {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 1rem;
}
.problem-statement h3 {
  color: var(--primary);
  margin-bottom: 1rem;
}
.objective-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: 0.8rem;
}
.objective-card h4 {
  color: var(--primary-2);
  margin-bottom: 0.75rem;
  font-size: 1rem;
}
.objective-card p {
  margin: 0;
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.5;
}