.project-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background: transparent;
  -webkit-backdrop-filter: blur(0px);
  backdrop-filter: blur(0px);
  transition:
    background-color 300ms ease-out,
    border-color 300ms ease-out,
    box-shadow 300ms ease-out,
    backdrop-filter 300ms ease-out,
    -webkit-backdrop-filter 300ms ease-out;
}

.project-header.scrolled {
  border-bottom: 1px solid var(--header-border);
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
  box-shadow: var(--shadow-lg);
}

.project-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 32px, var(--nav-container));
  height: 100%;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .project-nav {
    width: min(100% - 48px, var(--nav-container));
  }
}

@media (min-width: 1024px) {
  .project-nav {
    width: min(100% - 64px, var(--nav-container));
  }
}

.project-brand {
  flex-shrink: 0;
  color: var(--primary);
  font-family: var(--font-serif);
  font-size: 1.1875rem;
  font-weight: 600;
  line-height: 1.625rem;
  transition: color var(--transition);
  white-space: nowrap;
}

@media (min-width: 1024px) {
  .project-brand {
    font-size: 1.375rem;
    line-height: 1.875rem;
  }
}

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

.project-nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.project-nav-menu {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

@media (min-width: 1024px) {
  .project-nav-links {
    gap: 0.75rem;
  }
}

.project-nav-menu a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  color: var(--neutral-600);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.25rem;
  transition:
    color 150ms ease,
    background-color 150ms ease;
}

.project-nav-menu a:hover {
  color: var(--primary);
  background: rgba(14, 165, 233, 0.1);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 2.5rem;
  width: 2.5rem;
  border: 1px solid var(--neutral-200);
  border-radius: 0.5rem;
  color: var(--neutral-600);
  background: var(--background);
  cursor: pointer;
  padding: 0;
  transition: color var(--transition), background-color var(--transition), border-color var(--transition), transform var(--transition);
}

.theme-toggle:hover {
  color: var(--primary);
  background: var(--neutral-50);
}

.theme-toggle svg {
  width: 1.125rem;
  height: 1.125rem;
}

.sun-icon {
  display: block;
}

.moon-icon {
  display: none;
}

[data-theme="dark"] .sun-icon {
  display: none;
}

[data-theme="dark"] .moon-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle {
  border-color: var(--neutral-200);
  background: var(--neutral-50);
}

[data-theme="dark"] .theme-toggle:hover {
  background: var(--neutral-100);
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  height: 2.5rem;
  min-width: 3.5rem;
  padding: 0 0.5rem;
  border: 1px solid var(--neutral-200);
  border-radius: 0.5rem;
  color: var(--neutral-600);
  background: var(--background);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1rem;
  transition: color var(--transition), background-color var(--transition), border-color var(--transition), transform var(--transition);
}

.language-toggle:hover {
  color: var(--primary);
  background: var(--neutral-50);
}

.language-toggle svg {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

[data-theme="dark"] .language-toggle:hover {
  background: var(--neutral-100);
}

.project-page {
  width: min(100% - 32px, var(--page-container));
  margin: 0 auto;
  padding: 0rem 0 4rem;
}

.project-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(16rem, 0.55fr);
  gap: 3rem;
  align-items: end;
  padding: 2.7rem 0 0rem;
}

.project-kicker,
.section-eyebrow,
.demo-eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.project-section .demo-eyebrow {
  color: var(--accent);
}

.project-title-block {
  min-width: 0;
}

.project-hero h1 {
  max-width: 820px;
  margin: 0;
  color: var(--primary);
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0;
}

.project-subtitle {
  margin: 0.5rem 0 0;
  color: var(--primary);
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 3vw, 2.15rem);
  font-weight: 600;
  line-height: 1.2;
}

.project-lead {
  max-width: 680px;
  margin: 1.25rem 0 0;
  color: var(--neutral-700);
  font-size: 0.975rem;
  line-height: 1.75;
}

.project-lead strong,
.project-section strong {
  color: var(--primary);
  font-weight: 600;
}

.project-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.75rem;
  max-width: 680px;
  margin-top: 0.65rem;
  padding-right: 1.1rem;
  transform: translateY(-0.25rem);
}

.project-demo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  color: var(--accent);
  background: var(--card-bg);
  box-shadow: 0 10px 26px rgba(30, 41, 59, 0.06);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.25rem;
  transition:
    color var(--transition),
    background-color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition),
    transform var(--transition);
}

.project-demo-link:hover {
  border-color: rgba(14, 159, 178, 0.35);
  color: var(--accent-dark);
  background: rgba(14, 165, 233, 0.08);
  box-shadow: 0 14px 32px rgba(30, 41, 59, 0.1);
}

.project-meta {
  display: grid;
  gap: 1rem;
  min-width: 0;
  padding: 1rem;
  margin: 0rem 0 0;
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  background: var(--card-bg);
  box-shadow: 0 12px 32px rgba(30, 41, 59, 0.08);
  transform: translateY(-0.2rem);
}

.project-meta div {
  display: grid;
  gap: 0.25rem;
}

.project-meta dt {
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.25rem;
}

.project-meta dd {
  margin: 0;
  color: var(--neutral-700);
  font-size: 0.875rem;
  line-height: 1.4;
}

.project-section {
  scroll-margin-top: 6rem;
  padding: 1.5rem 0;
}

#role {
  padding-top: 0.85rem;
}

#demo {
  padding-top: 1.4rem;
}

.project-section h2 {
  margin: 0;
  color: var(--primary);
  font-family: var(--font-serif);
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: 0;
}

.project-section h3 {
  margin: 0;
  color: var(--primary);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.25;
}

.project-section p {
  margin: 0.85rem 0 0;
  color: var(--neutral-700);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 1.5rem;
}

.demo-section-heading {
  position: relative;
  max-width: 860px;
}

.demo-section-heading h2 {
  margin: 0.85rem 0 0.75rem;
}

.demo-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.demo-heading-doodle {
  flex: 0 0 auto;
  width: 7.2rem;
  margin: -1.8rem 0 -1.95rem 0.45rem;
  object-fit: contain;
  opacity: 0.86;
  transform: rotate(-7deg);
  pointer-events: none;
  user-select: none;
}

[data-theme="dark"] .demo-heading-doodle {
  opacity: 0.78;
}

.demo-video-card {
  position: relative;
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  background: var(--card-bg);
  box-shadow: 0 12px 32px rgba(30, 41, 59, 0.08);
}

.demo-video-card video {
  display: block;
  width: 100%;
}

.demo-video-card figcaption {
  padding: 0.75rem 0.85rem 0.85rem;
  color: var(--neutral-600);
  font-size: 0.8375rem;
  line-height: 1.5;
}

.module-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
  max-width: 900px;
}

.module-list article {
  display: grid;
  gap: 0.5rem;
  align-content: start;
  padding: 0.95rem;
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  background: var(--card-bg);
  box-shadow: 0 10px 26px rgba(30, 41, 59, 0.05);
}

.module-title {
  display: flex;
  align-content: start;
  align-items: baseline;
  gap: 0.5rem;
}

.module-index {
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.25rem;
}

.module-list p {
  margin: 0;
  color: var(--neutral-600);
  font-size: 0.875rem;
  line-height: 1.55;
}

.contribution-grid ul {
  display: grid;
  gap: 0.35rem;
  padding: 0;
  margin: 0.85rem 0 0;
  list-style: none;
}

.contribution-grid li {
  position: relative;
  padding-left: 0.95rem;
  color: var(--neutral-600);
  font-size: 0.8375rem;
  line-height: 1.48;
}

.contribution-grid li::before {
  position: absolute;
  top: 0.58rem;
  left: 0;
  width: 0.32rem;
  height: 0.32rem;
  border-radius: 999px;
  background: var(--accent);
  content: "";
}

.contribution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.contribution-grid article {
  padding: 1.25rem 1rem 1rem;
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  background: var(--card-bg);
  box-shadow:
    0 18px 42px rgba(30, 41, 59, 0.11),
    0 2px 8px rgba(30, 41, 59, 0.05);
}

.contribution-grid p {
  margin-top: 0.65rem;
  color: var(--neutral-700);
  font-size: 0.875rem;
  line-height: 1.55;
}

.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 32px, var(--page-container));
  padding: 1.5rem 0 2.5rem;
  margin: 0 auto;
  color: var(--neutral-500);
  font-size: 0.875rem;
}

.project-footer a {
  color: var(--accent);
  font-weight: 500;
  transition: color var(--transition);
}

.project-footer a:hover {
  color: var(--accent-dark);
}

@media (max-width: 900px) {
  .project-hero,
  .module-list,
  .contribution-grid {
    grid-template-columns: 1fr;
  }

  .project-hero {
    gap: 1.5rem;
    align-items: start;
    padding-top: 2.7rem;
  }

  .contribution-grid {
    gap: 0.8rem;
  }
}

@media (max-width: 720px) {
  .project-nav {
    width: min(100% - 24px, var(--nav-container));
  }

  .project-page {
    width: min(100% - 24px, var(--page-container));
    padding-top: 0.25rem;
  }

  .project-hero {
    padding: 1.8rem 0 0.75rem;
  }

  .project-actions {
    justify-content: flex-start;
    margin-top: 0.9rem;
    padding-right: 0;
    transform: none;
  }

  .project-meta {
    transform: none;
  }

  .project-section {
    padding: 2.25rem 0;
  }

  #role {
    padding-top: 1.65rem;
  }

  #demo {
    padding-top: 1.2rem;
  }

  .demo-title-row {
    align-items: flex-start;
  }

  .demo-heading-doodle {
    width: 6rem;
    margin: -1.2rem 2 -2.5rem 0.1rem;
  }

  .project-footer {
    width: min(100% - 24px, var(--page-container));
    align-items: flex-start;
    flex-direction: column;
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  .project-nav {
    width: min(100% - 24px, var(--nav-container));
  }

  .project-brand {
    min-width: 0;
    max-width: 9.5rem;
    overflow: hidden;
    font-size: 1.0625rem;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .project-nav-links {
    flex-shrink: 0;
    gap: 0.375rem;
  }

  .theme-toggle,
  .language-toggle {
    height: 2.25rem;
    border-radius: 0.45rem;
  }

  .theme-toggle {
    width: 2.25rem;
  }

  .language-toggle {
    min-width: 3.125rem;
    padding: 0 0.4rem;
  }
}