/* ──────────────────────────────────────────────────────────────────────────────
   DΛREΛKT_ UI — MODULE: ui.navbar
   Classification : UI Atom | Navigation Bar | Wrapping-Aware | Themeable
   Version        : 2.0.0 | Genesis-Final • BEM-Consistent • Responsive • Bus-Linked
   File           : /tools/modules/ui.navbar/ui.navbar.css
   Maintainer     : DΛREΛKT_ UI TEAM
   Runtime Tokens : --ui-navbar-bg, --ui-navbar-bd, --ui-navbar-fg,
                    --ui-navbar-link, --ui-navbar-hover, --ui-navbar-active,
                    --ui-navbar-padY, --ui-navbar-padX, --ui-navbar-gap,
                    --ui-navbar-logo-fs, --ui-navbar-link-fs
   ────────────────────────────────────────────────────────────────────────────── */

/* ─── Layer: Tokens ──────────────────────────────────────────────────────────── */
@layer tokens {
  :root {
    --ui-navbar-bg:      var(--site-bg, #fff);
    --ui-navbar-bd:      var(--site-border, #eee);
    --ui-navbar-fg:      var(--site-fg, #111);
    --ui-navbar-link:    var(--site-fg, #111);
    --ui-navbar-hover:   #000;
    --ui-navbar-active:  #000;
    --ui-navbar-padY:    16px;
    --ui-navbar-padX:    0px;    /* canvas handles side padding */
    --ui-navbar-gap:     24px;
    --ui-navbar-logo-fs: 18px;
    --ui-navbar-link-fs: 15px;
  }
}

/* ─── Layer: Atoms ───────────────────────────────────────────────────────────── */
@layer atoms {
  /* wrapping container */
  .ui-navbar__wrap {
    width: 100%;
    background: var(--ui-navbar-bg);
    border-bottom: 1px solid var(--ui-navbar-bd);
    position: relative;
    z-index: var(--ui-navbar-z, 100);
  }

  /* root element */
  .ui-navbar {
    width: 100%;
    color: var(--ui-navbar-fg);
  }

  /* inner flex row: logo left / menu right */
  .ui-navbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--ui-navbar-gap);
    padding: var(--ui-navbar-padY) var(--ui-navbar-padX);
    box-sizing: border-box;
    width: 100%;
  }

  /* logo */
  .ui-navbar__logo {
    font-size: var(--ui-navbar-logo-fs);
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--ui-navbar-fg);
    text-decoration: none;
    white-space: nowrap;
    display: inline-block;
    cursor: pointer;
    flex-shrink: 0; /* Prevent logo from shrinking */
  }

  /* menu list */
  .ui-navbar__menu {
    display: flex;
    align-items: center;
    gap: var(--ui-navbar-gap);
    list-style: none;
    margin: 0;
    padding: 0;
    margin-left: auto; /* Push menu to the right */
  }

  .ui-navbar__item {
    margin: 0;
    padding: 0;
  }

  .ui-navbar__link {
    color: var(--ui-navbar-link);
    font-size: var(--ui-navbar-link-fs);
    line-height: 1;
    text-decoration: none;
    padding: 2px 0;
    transition: color .15s ease, text-decoration .15s ease;
  }

  .ui-navbar__link:hover,
  .ui-navbar__link:focus {
    color: var(--ui-navbar-hover);
    text-decoration: underline;
  }

  .ui-navbar__link[aria-current="page"] {
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 3px;
    color: var(--ui-navbar-active);
  }

  /* ── Dropdown submenu ──────────────────────────────────────────────────── */
  .ui-navbar__item--has-dropdown {
    position: relative;
  }

  .ui-navbar__dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
    min-width: 180px;
    background: var(--ui-navbar-bg);
    border: 1px solid var(--ui-navbar-bd);
    border-radius: 6px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    z-index: 200;
  }

  .ui-navbar__item--has-dropdown:hover > .ui-navbar__dropdown,
  .ui-navbar__item--has-dropdown:focus-within > .ui-navbar__dropdown {
    display: block;
  }

  .ui-navbar__dropdown-item {
    margin: 0;
    padding: 0;
  }

  .ui-navbar__dropdown-link {
    display: block;
    padding: 0.4rem 1rem;
    white-space: nowrap;
    font-size: calc(var(--ui-navbar-link-fs) - 1px);
  }

  .ui-navbar__dropdown-link:hover,
  .ui-navbar__dropdown-link:focus {
    background: rgba(0, 0, 0, 0.04);
  }

  /* ── Hamburger button (hidden on desktop) ──────────────────────────────── */
  .ui-navbar__burger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    flex-direction: column;
    gap: 5px;
    z-index: 201;
  }

  .ui-navbar__burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--ui-navbar-fg);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .ui-navbar__burger--open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .ui-navbar__burger--open span:nth-child(2) {
    opacity: 0;
  }

  .ui-navbar__burger--open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* optional wrapping diagnostics (builder/inspector layer) */
  .ui-navbar__wrap[data-state="warn"] { outline: 1px dashed orange; }
  .ui-navbar__wrap[data-state="error"] { outline: 1px dashed red; }
  .ui-navbar__wrap[data-state="trust"] { outline: 1px dashed limegreen; }

  /* ── Mobile: hamburger + slide-down menu ─────────────────────────────── */
  @media (max-width: 720px) {
    .ui-navbar__burger {
      display: flex;
    }

    .ui-navbar__inner {
      flex-wrap: wrap;
    }

    .ui-navbar__menu {
      display: none;
      flex-direction: column;
      width: 100%;
      gap: 0;
      padding: 0.5rem 0;
      order: 3;
    }

    .ui-navbar__menu--open {
      display: flex;
    }

    .ui-navbar__item {
      width: 100%;
    }

    .ui-navbar__link {
      display: block;
      padding: 0.75rem 0;
      border-bottom: 1px solid var(--ui-navbar-bd);
    }

    .ui-navbar__dropdown {
      position: static;
      transform: none;
      box-shadow: none;
      border: none;
      padding: 0 0 0 1.5rem;
      min-width: auto;
      background: transparent;
    }

    .ui-navbar__item--has-dropdown > .ui-navbar__dropdown {
      display: block;
    }

    .ui-navbar__dropdown-link {
      padding: 0.5rem 0;
      border-bottom: 1px solid var(--ui-navbar-bd);
    }
  }
}