/**
 * Component: Site Header
 *
 * Shared public and application navigation shell.
 */

@layer components {
  /* ==========================================================================
     1. Root
     ========================================================================== */

  .d1-site-header {
    position: sticky;
    z-index: var(--dig-z-index-sticky);
    top: 0;

    width: 100%;

    background-color: color-mix(in srgb, var(--dig-color-bg) 96%, transparent);

    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--dig-color-border-subtle);
    border-bottom-color: color-mix(
      in srgb,
      var(--dig-color-border) 115%,
      transparent
    );

    /*
   * Do not apply backdrop-filter on mobile.
   * Safari can treat fixed descendants as belonging to this containing block.
   */
    backdrop-filter: none;
  }

  .d1-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: clamp(4.5rem, 4.25rem + 0.7vw, 5rem);
    height: var(--dig-header-height);
  }

  .d1-mobile-context {
    display: block;
  }

  /* ==========================================================================
   2. Branding
   ========================================================================== */

  .d1-branding {
    position: relative;
    z-index: 2;

    flex: 0 0 auto;

    min-width: 0;
    margin-right: clamp(1.5rem, 3vw, 3.5rem);
  }

  .d1-logo-link,
  .d1-logo-text {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;

    color: var(--dig-color-primary);
    line-height: 0;
    text-decoration: none;
  }

  .d1-logo-link .d1-logo-image {
    display: block;

    width: clamp(8.75rem, 8.25rem + 0.8vw, 11rem);
    height: 2.25rem;

    object-fit: contain;
    object-position: left center;

    max-width: 100%;
  }

  .d1-logo-text {
    font-family: var(--dig-font-primary);
    font-size: clamp(1rem, 0.95rem + 0.2vw, 1.125rem);
    font-weight: var(--dig-font-weight-semibold);
    line-height: 1;
    letter-spacing: var(--dig-letter-spacing-heading);
  }

  /* ==========================================================================
     3. Navigation Shell
     ========================================================================== */

  .d1-header-nav {
    position: fixed;
    z-index: var(--dig-z-index-modal);

    inset: var(--dig-header-height) 0 0;

    display: flex;
    flex-direction: column;

    width: 100%;
    height: calc(100dvh - var(--dig-header-height));
    min-width: 0;

    padding: clamp(2.25rem, 8vw, 4rem) var(--dig-page-gutter)
      var(--dig-spacing-lg);

    overflow-y: auto;
    overscroll-behavior: contain;

    background-color: var(--dig-color-bg);
    border-top: 1px solid var(--dig-color-border-subtle);

    opacity: 0;
    visibility: hidden;
    pointer-events: none;

    transform: translateY(-0.75rem);

    transition:
      opacity 180ms ease,
      visibility 180ms ease,
      transform 220ms ease;
  }

  .d1-site-header.is-menu-open .d1-header-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  html.d1-navigation-open {
    overflow: hidden;
  }

  /* ==========================================================================
     4. Navigation Links
     ========================================================================== */

  .d1-nav-list {
    display: flex;
    flex-direction: column;

    width: 100%;
    max-width: var(--dig-container-max-width);
    margin: 0 auto;
    padding: 0;

    list-style: none;

    counter-reset: d1-mobile-navigation;
  }

  .d1-nav-item {
    display: flex;

    width: 100%;

    counter-increment: d1-mobile-navigation;
  }

  .d1-nav-link {
    position: relative;

    display: grid;
    grid-template-columns: 2.5rem minmax(0, 1fr);
    align-items: center;
    gap: var(--dig-spacing-sm);

    width: 100%;
    padding-block: clamp(1.25rem, 4vw, 1.75rem);

    border-bottom: 1px solid var(--dig-color-border-subtle);

    color: var(--dig-color-primary);

    font-family: var(--dig-font-primary);
    font-size: clamp(1.25rem, 1.05rem + 1vw, 1.75rem);
    font-weight: var(--dig-font-weight-semibold);
    line-height: 1.15;
    letter-spacing: var(--dig-letter-spacing-heading);
    text-decoration: none;

    min-height: 2.75rem;

    cursor: pointer;

    transition:
      color var(--dig-transition-fast),
      padding-left var(--dig-transition-fast);
  }

  .d1-nav-link::before {
    content: counter(d1-mobile-navigation, decimal-leading-zero);

    color: var(--dig-color-text-muted);

    font-family: var(--dig-font-mono);
    font-size: var(--dig-font-size-xs);
    font-weight: var(--dig-font-weight-semibold);
    line-height: 1;
    letter-spacing: var(--dig-letter-spacing-label);
  }

  .d1-nav-link::after {
    content: "→";

    position: absolute;
    right: 0;

    color: var(--dig-color-secondary);

    font-family: var(--dig-font-sans);
    font-size: 1em;
    font-weight: var(--dig-font-weight-regular);

    opacity: 0;

    transform: translateX(-0.5rem);

    transition:
      opacity var(--dig-transition-fast),
      transform var(--dig-transition-fast);
  }

  .d1-nav-link:hover,
  .d1-nav-link:focus-visible,
  .d1-nav-link.is-active {
    color: var(--dig-color-primary);
  }

  .d1-nav-link:hover::after,
  .d1-nav-link:focus-visible::after,
  .d1-nav-link.is-active::after {
    opacity: 1;

    transform: translateX(0);
  }

  /* ==========================================================================
   Mobile Platform Context
   ========================================================================== */

  .d1-mobile-context {
    width: 100%;
    max-width: var(--dig-container-max-width);
    margin: clamp(2rem, 8vw, 4rem) auto 0;
    padding-top: var(--dig-spacing-md);

    border-top: 1px solid var(--dig-color-border-subtle);
  }

  .d1-mobile-context__eyebrow {
    margin: 0 0 var(--dig-spacing-sm);

    color: var(--dig-color-text-muted);

    font-family: var(--dig-font-mono);
    font-size: var(--dig-font-size-xs);
    font-weight: var(--dig-font-weight-semibold);
    line-height: 1;
    letter-spacing: var(--dig-letter-spacing-mono);
    text-transform: uppercase;
  }

  .d1-mobile-context__list {
    display: grid;
    gap: var(--dig-spacing-xs);

    margin: 0;
  }

  .d1-mobile-context__item {
    display: grid;
    grid-template-columns: minmax(6rem, 0.7fr) minmax(0, 1fr);
    gap: var(--dig-spacing-sm);

    padding-block: var(--dig-spacing-xs);

    border-bottom: 1px solid var(--dig-color-border-subtle);
  }

  .d1-mobile-context__item dt,
  .d1-mobile-context__item dd {
    margin: 0;
  }

  .d1-mobile-context__item dt {
    color: var(--dig-color-text-muted);

    font-family: var(--dig-font-mono);
    font-size: var(--dig-font-size-xs);
    font-weight: var(--dig-font-weight-semibold);
    letter-spacing: var(--dig-letter-spacing-label);
    text-transform: uppercase;
  }

  .d1-mobile-context__item dd {
    display: inline-flex;
    align-items: center;
    gap: var(--dig-spacing-xxs);

    color: var(--dig-color-primary);

    font-size: var(--dig-font-size-small);
    font-weight: var(--dig-font-weight-semibold);
  }

  .d1-mobile-context__status-dot {
    width: 0.45rem;
    height: 0.45rem;

    background-color: var(--dig-color-success);
    border-radius: var(--dig-radius-full);

    box-shadow: 0 0 0.5rem
      color-mix(in srgb, var(--dig-color-success) 45%, transparent);
  }

  /* ==========================================================================
     5. Header Actions
     ========================================================================== */

  .d1-header-actions {
    display: flex;
    flex-direction: column;
    gap: var(--dig-spacing-xs);

    width: 100%;
    max-width: var(--dig-container-max-width);
    margin: clamp(2rem, 6vw, 3rem) auto 0;
    padding-top: var(--dig-spacing-lg);

    border-top: 1px solid var(--dig-color-border-subtle);
  }

  .d1-header-actions .dig-btn {
    width: 100%;
    min-height: 3rem;

    transform: none;
  }

  .d1-header-actions .dig-btn:hover {
    transform: none;
  }

  .d1-header-actions .dig-btn--outline {
    --btn-bg: transparent;
    --btn-border: var(--dig-color-border);
    --btn-fg: var(--dig-color-primary);
    --btn-bg-hover: var(--dig-color-bg-alt);
  }

  /* ==========================================================================
     6. Search
     ========================================================================== */

  .d1-header-search {
    flex: 1 1 auto;

    min-width: 0;
  }

  /* ==========================================================================
     7. Mobile Toggle
     ========================================================================== */

  .d1-mobile-toggle {
    position: relative;
    z-index: 2;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: clamp(2.75rem, 2.55rem + 0.8vw, 3rem);
    height: clamp(2.75rem, 2.55rem + 0.8vw, 3rem);
    padding: 0;

    background: transparent;
    border: 0;
    border-radius: var(--dig-radius-sm);

    color: var(--dig-color-primary);

    cursor: pointer;

    transition: background-color var(--dig-transition-fast);
  }

  .d1-mobile-toggle:hover {
    background-color: var(--dig-color-bg-alt);
  }

  .d1-mobile-toggle__bars {
    position: relative;

    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.3rem;

    width: 1.5rem;
    height: 1.5rem;
  }

  .d1-mobile-toggle__bar {
    display: block;

    width: 100%;
    height: 0.14rem;

    background-color: currentColor;
    border-radius: var(--dig-radius-full);

    transform-origin: center;

    transition:
      opacity 180ms ease,
      transform 220ms ease;
  }

  .d1-site-header.is-menu-open .d1-mobile-toggle__bar:nth-child(1) {
    transform: translateY(0.44rem) rotate(45deg);
  }

  .d1-site-header.is-menu-open .d1-mobile-toggle__bar:nth-child(2) {
    opacity: 0;
  }

  .d1-site-header.is-menu-open .d1-mobile-toggle__bar:nth-child(3) {
    transform: translateY(-0.44rem) rotate(-45deg);
  }

  @media (max-width: 48rem) {
    .d1-logo-link {
      max-width: none;
    }

    .d1-logo-link .d1-logo-image {
      width: 8.75rem;
      height: auto;
    }
  }

  /* ==========================================================================
     8. Desktop
     ========================================================================== */

  @media (min-width: 62rem) {
    .d1-header-nav {
      position: static;
      inset: auto;

      display: flex;
      flex: 1 1 auto;
      flex-direction: row;
      align-items: center;
      justify-content: space-between;

      width: auto;
      height: auto;
      min-width: 0;
      min-height: 0;

      margin: 0;
      padding: 0;

      overflow: visible;
      overscroll-behavior: auto;

      background: transparent;
      border: 0;

      opacity: 1;
      visibility: visible;
      pointer-events: auto;

      transform: none;

      transition: none;
    }

    .d1-nav-list {
      flex: 0 1 auto;
      flex-direction: row;
      gap: clamp(1.75rem, 3vw, 3.5rem);

      width: auto;
      max-width: none;
      margin: 0;
    }

    .d1-nav-item {
      width: auto;
    }

    .d1-nav-link {
      display: inline-flex;
      align-items: center;
      width: auto;
      min-height: 2.75rem;
      height: var(--dig-header-height);
      padding: 0;

      border: 0;

      color: var(--dig-color-text-muted);

      font-family: var(--dig-font-sans);
      font-size: clamp(0.8125rem, 0.79rem + 0.1vw, 0.875rem);
      font-weight: var(--dig-font-weight-semibold);
      line-height: 1;
      letter-spacing: 0;
    }

    .d1-nav-link::before {
      display: none;
    }

    .d1-nav-link::after {
      content: "";

      position: absolute;
      right: 0;
      bottom: -1px;
      left: 0;

      width: auto;
      height: 2px;

      background-color: var(--dig-color-secondary);

      opacity: 1;

      transform: scaleX(0);
      transform-origin: center;

      transition: transform var(--dig-transition-fast);
    }

    .d1-nav-link:hover,
    .d1-nav-link:focus-visible,
    .d1-nav-link.is-active {
      color: var(--dig-color-primary);
    }

    .d1-nav-link:hover::after,
    .d1-nav-link:focus-visible::after,
    .d1-nav-link.is-active::after {
      transform: scaleX(1);
    }

    .d1-header-actions {
      flex: 0 0 auto;
      flex-direction: row;
      align-items: center;
      gap: var(--dig-spacing-xs);

      width: auto;
      max-width: none;
      margin: 0;
      padding: 0;

      border: 0;
    }

    .d1-header-actions .dig-btn {
      width: auto;
      min-height: 2.75rem;
      padding-inline: clamp(1rem, 0.8rem + 0.6vw, 1.5rem);
    }

    .d1-header-actions .dig-btn--outline {
      --btn-border: transparent;
      --btn-bg-hover: var(--dig-color-bg-alt);

      padding-inline: clamp(0.75rem, 0.65rem + 0.3vw, 1rem);
    }

    .d1-mobile-context {
      display: none;
    }

    .d1-mobile-toggle {
      display: none;
    }
  }

  /* ==========================================================================
     9. Feature Support
     ========================================================================== */

  @supports not (backdrop-filter: blur(1px)) {
    .d1-site-header {
      background-color: var(--dig-color-bg);
    }
  }

  @media (prefers-reduced-transparency: reduce) {
    .d1-site-header {
      background-color: var(--dig-color-bg);
      backdrop-filter: none;
    }
  }
}