/* ========================================================================
   layout.css — header, nav, footer scaffolds
   ======================================================================== */

@layer components {
  /* --- Header --------------------------------------------------------- */
  .site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-fixed);
    background: var(--bg-nav);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
  }

  .site-header__inner {
    display: flex;
    align-items: center;
    gap: var(--space-m);
    padding-block: var(--space-s);
  }

  .site-header__logo {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
  }

  /* --- Nav primaire -------------------------------------------------- */
  .site-nav {
    flex: 1 1 auto;
    display: flex;
    gap: var(--space-m);
    justify-content: center;
    flex-wrap: wrap;
  }

  .site-nav a {
    position: relative;
    font-family: var(--font-body);
    font-size: var(--step--1);
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    padding-block: 0.25em;
    transition: color var(--motion-fast) ease;
  }
  .site-nav a:hover { color: var(--ink); }
  .site-nav a[aria-current="page"] { color: var(--ink); }
  .site-nav a[aria-current="page"]::after {
    content: "";
    position: absolute;
    inset: auto 0 -2px 0;
    height: 2px;
    background: var(--accent-red);
  }

  @media (max-width: 56rem) {
    .site-nav { display: none; }
  }

  /* --- Footer -------------------------------------------------------- */
  .site-footer {
    border-top: 1px solid var(--border);
    margin-top: var(--space-3xl);
  }

  /* --- Hero ---------------------------------------------------------- */
  .hero {
    position: relative;
    isolation: isolate;
    overflow: hidden;
  }
  .hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
      radial-gradient(60% 80% at 80% 0%, color-mix(in oklch, var(--accent-red) 18%, transparent), transparent 60%),
      radial-gradient(40% 60% at 0% 100%, color-mix(in oklch, var(--qc-blue) 10%, transparent), transparent 60%);
    z-index: -1;
    pointer-events: none;
  }
}

/* ========================================================================
   Mobile navigation — hamburger + slide-in drawer (added 2026-06-04)
   ======================================================================== */
@layer components {
  .nav-toggle {
    display: none;
    flex: 0 0 auto;
    margin-inline-start: auto;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    inline-size: 44px;
    block-size: 44px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
  }
  .nav-toggle span {
    display: block;
    inline-size: 22px;
    block-size: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform var(--motion-fast) ease, opacity var(--motion-fast) ease;
  }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .mobile-nav {
    position: fixed;
    inset-block: 0;
    inset-inline-end: 0;
    inline-size: min(86vw, 360px);
    z-index: var(--z-fixed);
    display: flex;
    flex-direction: column;
    gap: var(--space-l);
    padding: calc(var(--space-2xl) + env(safe-area-inset-top, 0px)) var(--space-l)
             calc(var(--space-l) + env(safe-area-inset-bottom, 0px));
    background: var(--bg-black);
    backdrop-filter: blur(22px) saturate(1.1);
    border-inline-start: 1px solid var(--border);
    overflow-y: auto;
    visibility: hidden;
    transform: translateX(100%);
    transition: transform var(--motion-base) ease, visibility var(--motion-base) ease;
  }
  .mobile-nav[data-open="true"] { visibility: visible; transform: translateX(0); }

  .mobile-nav__links { display: flex; flex-direction: column; }
  .mobile-nav__links a {
    font-family: var(--font-body);
    font-size: var(--step-1);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--text-muted);
    padding-block: var(--space-s);
    border-block-end: 1px solid var(--border);
    transition: color var(--motion-fast) ease;
  }
  .mobile-nav__links a:hover,
  .mobile-nav__links a[aria-current="page"] { color: var(--ink); }

  .mobile-nav__cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-m);
    margin-block-start: auto;
  }
  .mobile-nav__cta .kev-mark-link { display: inline-flex; }
  .mobile-nav__cta .kev-mark { height: 44px; opacity: 0.9; }
  .mobile-nav__cta .btn { flex: 1 1 auto; justify-content: center; text-align: center; }

  .mobile-nav__backdrop {
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-fixed) - 1);
    background: color-mix(in oklch, black 55%, transparent);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--motion-base) ease, visibility var(--motion-base) ease;
  }
  .mobile-nav__backdrop[data-open="true"] { opacity: 1; visibility: visible; }

  html[data-nav-locked] { overflow: hidden; }

  @media (max-width: 56rem) {
    .nav-toggle { display: inline-flex; }
    /* sur mobile, la barre = logo + hamburger seulement */
    .site-header__inner > .btn { display: none; }
  }
  @media (min-width: 56.0625rem) {
    .mobile-nav, .mobile-nav__backdrop, .nav-toggle { display: none !important; }
  }
}