@layer components {
  /* =========================================================================
     Header
     ========================================================================= */

  .header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    height: 48px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--gutter);
  }

  .header-logo {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    transition: color var(--dur-fast);
    flex-shrink: 0;
  }

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

  /* The duck rides along as a mark, not as the product illustration. */
  .header-logo img {
    width: 20px;
    height: 20px;
  }

  .header-nav {
    display: flex;
    align-items: center;
    gap: 0;
    margin-left: auto;
  }

  .nav-link {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    height: 48px;
    padding: 0 0.85rem;
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition:
      color var(--dur-fast),
      border-color var(--dur-fast);
    white-space: nowrap;
  }

  .nav-link:hover {
    color: var(--text-primary);
    border-bottom-color: var(--border-accent);
  }

  .nav-link[aria-current="page"] {
    color: var(--text-primary);
    border-bottom-color: var(--accent);
  }

  .nav-external {
    display: flex;
    align-items: center;
    gap: 0.4rem;
  }

  .nav-external img,
  .nav-external svg {
    width: 15px;
    height: 15px;
  }

  /* GitHub star count, filled in by js/github.js. Reserves its own width so
     arriving data cannot shift the header. */
  .nav-stars {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    min-width: 2.2rem;
  }

  .nav-cta {
    margin-left: 0.75rem;
    padding: 0.4rem 1rem;
    background: var(--accent);
    color: var(--accent-contrast);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    border-radius: var(--radius-sm);
    transition: background var(--dur-fast);
    white-space: nowrap;
  }

  .nav-cta:hover {
    background: var(--accent-hover);
    color: var(--accent-contrast);
  }

  .menu-toggle {
    display: none;
    padding: 0.25rem;
    color: var(--text-primary);
  }

  .menu-toggle svg {
    width: 20px;
    height: 20px;
  }

  /* One glyph at a time, driven by the same state screen readers see. */
  .menu-toggle .icon-close,
  .menu-toggle[aria-expanded="true"] .icon-menu {
    display: none;
  }

  .menu-toggle[aria-expanded="true"] .icon-close {
    display: block;
  }

  .mobile-nav {
    display: none;
  }

  .mobile-nav[data-open="true"] {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    inset: 48px 0 auto 0;
    z-index: 99;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
    padding: 1rem 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  @media (max-width: 900px) {
    .header-nav {
      display: none;
    }

    .menu-toggle {
      display: flex;
      align-items: center;
    }

    .mobile-nav .nav-link {
      height: auto;
      padding: 0.9rem var(--gutter);
      font-size: 1rem;
      border-bottom: none;
    }

    .mobile-nav .nav-link:hover {
      background: var(--bg-card);
    }

    .mobile-nav .nav-link[aria-current="page"] {
      color: var(--accent);
      border-bottom-color: transparent;
    }

    .mobile-nav .nav-cta {
      margin: 1rem var(--gutter) 0;
      padding: 0.75rem 1.5rem;
      text-align: center;
    }
  }

  /* =========================================================================
     Announcement banner
     ========================================================================= */

  .announcement {
    padding: 0.5rem var(--gutter);
    text-align: center;
    font-size: 0.8rem;
    background: var(--accent-soft);
    border-bottom: 1px solid var(--accent-line);
    color: var(--text-secondary);
  }

  .announcement a {
    color: var(--accent);
    font-weight: 600;
    text-underline-offset: 3px;
    text-decoration: underline;
    text-decoration-color: var(--accent-line);
  }

  .announcement a:hover {
    text-decoration-color: var(--accent);
  }

  /* =========================================================================
     Buttons
     ========================================================================= */

  .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    border-radius: var(--radius);
    transition:
      background var(--dur-fast),
      border-color var(--dur-fast),
      color var(--dur-fast),
      box-shadow var(--dur-fast),
      transform var(--dur-fast);
  }

  .btn svg {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
  }

  .btn--primary {
    background: var(--accent);
    color: var(--accent-contrast);
    box-shadow: var(--shadow-sm);
  }

  .btn--primary:hover {
    background: var(--accent-hover);
    color: var(--accent-contrast);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
  }

  .btn--secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-accent);
    font-weight: 400;
  }

  .btn--secondary:hover {
    border-color: var(--text-secondary);
    transform: translateY(-1px);
  }

  .btn--ghost {
    padding: 0.75rem 0;
    background: transparent;
    color: var(--accent);
    font-weight: 400;
  }

  .btn--ghost:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
  }

  .btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }

  /* =========================================================================
     Install command
     ========================================================================= */

  .install {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.5rem 0.5rem 0.85rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    max-width: 100%;
  }

  .install-prompt {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent);
    user-select: none;
  }

  .install-text {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
    user-select: all;
    overflow-x: auto;
    white-space: nowrap;
  }

  .copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 1.75rem;
    height: 1.75rem;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    transition:
      color var(--dur-fast),
      background var(--dur-fast);
  }

  .copy-btn:hover {
    color: var(--accent);
    background: var(--accent-soft);
  }

  .copy-btn svg {
    width: 1rem;
    height: 1rem;
  }

  .copy-btn[data-copied="true"] {
    color: var(--support-green);
  }

  /* Swap clipboard glyph for a tick on success. */
  .copy-btn .icon-check,
  .copy-btn[data-copied="true"] .icon-copy {
    display: none;
  }

  .copy-btn[data-copied="true"] .icon-check {
    display: block;
  }

  /* =========================================================================
     Code
     ========================================================================= */

  .code-block {
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: var(--radius);
    overflow: hidden;
  }

  .code-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-shrink: 0;
    padding: 0.5rem 1rem;
    background: var(--code-header-bg);
    border-bottom: 1px solid var(--code-border);
  }

  .code-lang {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #8b949e;
  }

  .code-head .copy-btn {
    color: #8b949e;
  }

  .code-head .copy-btn:hover {
    color: #e6edf3;
    background: #ffffff14;
  }

  .code-block pre {
    flex: 1;
    margin: 0;
    padding: 1.25rem 1.5rem;
    overflow-x: auto;
  }

  .code-block code {
    font-size: 0.825rem;
    line-height: 1.7;
    background: none !important;
    padding: 0 !important;
    color: var(--code-color);
  }

  /* =========================================================================
     Tabs  (quickstart, document demo)
     ========================================================================= */

  .tablist {
    display: flex;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
  }

  .tab {
    padding: 0.65rem 1.15rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    background: transparent;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition:
      color var(--dur-fast),
      border-color var(--dur-fast);
  }

  .tab:hover {
    color: var(--text-primary);
  }

  .tab[aria-selected="true"] {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  .tabpanel[hidden] {
    display: none;
  }

  /* =========================================================================
     Cards
     ========================================================================= */

  .card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 2rem;
    background: var(--bg-primary);
    transition: background var(--dur-fast);
  }

  a.card:hover,
  .card--interactive:hover {
    background: var(--bg-card-hover);
  }

  .card-icon {
    width: 1.75rem;
    height: 1.75rem;
    flex-shrink: 0;
    color: var(--accent);
  }

  .card-title {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
  }

  .card-body {
    flex: 1;
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--text-secondary);
  }

  .card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    align-self: flex-start;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent);
  }

  .card-link svg {
    flex-shrink: 0;
  }

  .card-link:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
  }

  /* The DocLang anchor card sits at the centre of the "convert once" arc. */
  .card--anchor {
    background: var(--accent-soft);
    align-items: flex-start;
  }

  .grid > .card--anchor {
    border-color: var(--accent-line);
  }

  .card-meta {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-tertiary);
  }

  .card-meta-dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--border-accent);
    flex-shrink: 0;
  }

  a.card:hover .card-title {
    color: var(--accent);
  }

  .card-arrow {
    align-self: flex-end;
    font-size: 1.2rem;
    color: var(--text-tertiary);
    transition:
      color var(--dur-fast),
      transform var(--dur-fast);
  }

  a.card:hover .card-arrow {
    color: var(--accent);
    transform: translateX(4px);
  }

  .card-thumb {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background: var(--bg-card);
  }

  /* =========================================================================
     Tags, chips, badges
     ========================================================================= */

  .tag {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid var(--accent-line);
    border-radius: var(--radius-sm);
  }

  .tag--cyan {
    color: var(--support-cyan);
    background: var(--support-cyan-soft);
    border-color: color-mix(in srgb, var(--support-cyan) 30%, transparent);
  }

  .tag--green {
    color: var(--support-green);
    background: var(--support-green-soft);
    border-color: color-mix(in srgb, var(--support-green) 30%, transparent);
  }

  .tag--purple {
    color: var(--support-purple);
    background: var(--support-purple-soft);
    border-color: color-mix(in srgb, var(--support-purple) 30%, transparent);
  }

  .tag--muted {
    color: var(--text-tertiary);
    background: transparent;
    border-color: var(--border);
  }

  .chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  /* =========================================================================
     Footer
     ========================================================================= */

  .footer {
    margin-top: auto;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
  }

  .footer-top {
    display: grid;
    grid-template-columns: 1.4fr repeat(3, 1fr);
    gap: 3rem;
    padding: 3.5rem 0 3rem;
  }

  .footer-brand-block {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }

  .footer-tagline {
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--text-secondary);
    max-width: 32ch;
  }

  .footer-col-title {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 1rem;
  }

  .footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
  }

  .footer-col a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: color var(--dur-fast);
  }

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

  .footer-social {
    display: flex;
    gap: 0.85rem;
  }

  .footer-social a {
    display: flex;
    width: 20px;
    height: 20px;
    opacity: 0.6;
    transition: opacity var(--dur-fast);
  }

  .footer-social a:hover {
    opacity: 1;
  }

  .footer-social img {
    width: 100%;
    height: 100%;
  }

  .footer-bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
    font-size: 0.75rem;
    color: var(--text-tertiary);
  }

  .footer-bottom nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
  }

  .footer-bottom a:hover {
    color: var(--text-secondary);
  }

  .footer-lf {
    display: flex;
    align-items: center;
    gap: 0.85rem;
  }

  .footer-lf img {
    height: 28px;
    width: auto;
    opacity: 0.7;
    filter: var(--mono-logo-filter);
  }

  @media (max-width: 900px) {
    .footer-top {
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
    }
  }

  @media (max-width: 600px) {
    .footer-top {
      grid-template-columns: 1fr;
      gap: 2rem;
    }
  }

  /* =========================================================================
     Notice — used for content that is not yet verifiable
     ========================================================================= */

  .notice {
    display: flex;
    gap: 0.85rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border-left: 2px solid var(--support-cyan);
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--text-secondary);
  }

  .notice strong {
    color: var(--text-primary);
  }

  .notice svg {
    width: 1.1rem;
    height: 1.1rem;
    flex-shrink: 0;
    margin-top: 0.15rem;
    color: var(--support-cyan);
  }

  .notice--accent {
    border-left-color: var(--accent);
  }

  .notice--accent svg {
    color: var(--accent);
  }

  /* =========================================================================
     Filters (blog + papers)
     ========================================================================= */

  .filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
  }

  .filters button {
    padding: 0.65rem 1.15rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition:
      color var(--dur-fast),
      border-color var(--dur-fast);
  }

  .filters button:hover {
    color: var(--text-primary);
  }

  .filters button.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  /* =========================================================================
     Syntax highlighting

     Pygments token classes, coloured against the fixed dark code surface.
     Generated at build time, so there is no highlighter to download. Scoped to
     both the Code component and prose blocks in rendered Markdown, which come
     from the same highlighter.
     ========================================================================= */

  :is(.code-block, .prose pre) .k,
  :is(.code-block, .prose pre) .kn,
  :is(.code-block, .prose pre) .kd,
  :is(.code-block, .prose pre) .kc,
  :is(.code-block, .prose pre) .kr,
  :is(.code-block, .prose pre) .ow {
    color: #ff7b72;
  }

  :is(.code-block, .prose pre) .s,
  :is(.code-block, .prose pre) .s1,
  :is(.code-block, .prose pre) .s2,
  :is(.code-block, .prose pre) .sb,
  :is(.code-block, .prose pre) .sd,
  :is(.code-block, .prose pre) .se,
  :is(.code-block, .prose pre) .si,
  :is(.code-block, .prose pre) .sa {
    color: #a5d6ff;
  }

  :is(.code-block, .prose pre) .nf,
  :is(.code-block, .prose pre) .fm,
  :is(.code-block, .prose pre) .nd {
    color: #d2a8ff;
  }

  :is(.code-block, .prose pre) .nc,
  :is(.code-block, .prose pre) .nn,
  :is(.code-block, .prose pre) .ne {
    color: #ffa657;
  }

  :is(.code-block, .prose pre) .nb,
  :is(.code-block, .prose pre) .bp,
  :is(.code-block, .prose pre) .m,
  :is(.code-block, .prose pre) .mi,
  :is(.code-block, .prose pre) .mf,
  :is(.code-block, .prose pre) .mh,
  :is(.code-block, .prose pre) .no {
    color: #79c0ff;
  }

  :is(.code-block, .prose pre) .c,
  :is(.code-block, .prose pre) .c1,
  :is(.code-block, .prose pre) .cm,
  :is(.code-block, .prose pre) .cp,
  :is(.code-block, .prose pre) .cs {
    color: #8b949e;
    font-style: italic;
  }

  :is(.code-block, .prose pre) .o,
  :is(.code-block, .prose pre) .p,
  :is(.code-block, .prose pre) .nt,
  :is(.code-block, .prose pre) .na {
    color: #c9d1d9;
  }

  :is(.code-block, .prose pre) .err {
    color: inherit;
  }
}