/* ==========================================================================
   Tamnature — Layout : header, footer, grids, responsive
   ========================================================================== */

/* --- Header ------------------------------------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 50;
  display: flex;
  align-items: center;
  background-color: rgba(239, 230, 210, 0.82);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid rgba(62, 90, 46, 0.08);
  transition: background-color var(--t-fast) var(--ease-soft),
              border-color    var(--t-fast) var(--ease-soft);
}

.site-header.is-scrolled {
  background-color: rgba(251, 246, 234, 0.95);
  border-bottom-color: rgba(62, 90, 46, 0.18);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  width: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--c-vert-fonce);
  letter-spacing: var(--tracking-display);
}

.brand-mark {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
}

.brand:hover { color: var(--c-cire); }

/* Nav */
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.primary-nav ul {
  display: flex;
  gap: var(--sp-4);
  align-items: center;
}

.primary-nav a {
  position: relative;
  font-family: var(--font-nav);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--c-encre);
  padding: 0.4rem 0;
}

.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--c-safran);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-fast) var(--ease-soft);
}

.primary-nav a:hover::after,
.primary-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.lang-switch {
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--c-vert-fonce);
  padding: 0.45rem 0.8rem;
  border: 1px solid rgba(62, 90, 46, 0.25);
  border-radius: var(--radius-pill);
  transition: background-color var(--t-fast), border-color var(--t-fast);
}

.lang-switch:hover {
  background-color: var(--c-safran-soft);
  border-color: var(--c-safran);
  color: var(--c-vert-fonce);
}

/* Burger button */
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(62, 90, 46, 0.2);
  position: relative;
}

.nav-toggle span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 2px;
  background: var(--c-vert-fonce);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: transform var(--t-fast) var(--ease-soft),
              opacity var(--t-fast);
}
.nav-toggle span:nth-child(1) { transform: translate(-50%, calc(-50% - 6px)); }
.nav-toggle span:nth-child(3) { transform: translate(-50%, calc(-50% + 6px)); }

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translate(-50%, -50%) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* --- Main offset under fixed header ------------------------------------ */
main { padding-top: var(--header-h); }

/* --- Footer ------------------------------------------------------------- */
.site-footer {
  background: linear-gradient(180deg, var(--c-lin) 0%, var(--c-lin-fonce) 100%);
  padding: var(--sp-6) 0 var(--sp-4);
  position: relative;
  z-index: 2;
  border-top: 1px solid rgba(62, 90, 46, 0.12);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--sp-5);
  margin-bottom: var(--sp-5);
}

.footer-col h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--c-or-ancien);
  margin-bottom: var(--sp-3);
  font-family: var(--font-body);
  font-weight: 600;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-col a { color: var(--c-encre); }
.footer-col a:hover { color: var(--c-cire); }

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.footer-brand .brand { font-size: 1.6rem; }

.footer-tagline {
  color: rgba(42, 36, 24, 0.7);
  max-width: 32ch;
  font-size: 0.95rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  justify-content: space-between;
  padding-top: var(--sp-4);
  border-top: 1px dashed rgba(62, 90, 46, 0.25);
  font-size: 0.85rem;
  color: rgba(42, 36, 24, 0.65);
}

.footer-bottom strong {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  color: var(--c-vert-fonce);
}

/* --- Grids -------------------------------------------------------------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

/* --- Responsive --------------------------------------------------------- */
@media (max-width: 880px) {
  /* The fixed header uses backdrop-filter, which makes it the containing
     block for fixed descendants. Render the mobile panel as a portal-like
     fixed layer sized to the viewport instead of relying on bottom:0. */
  .primary-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    height: calc(100vh - var(--header-h));
    height: calc(100dvh - var(--header-h));
    width: min(82vw, 320px);
    background: var(--c-blanc-creme);
    border-left: 1px solid rgba(62, 90, 46, 0.15);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--sp-5) var(--sp-4);
    gap: var(--sp-4);
    transform: translateX(100%);
    transition: transform var(--t-mid) var(--ease-out);
    box-shadow: -20px 0 50px -30px rgba(62, 90, 46, 0.4);
    z-index: 60;
    overflow-y: auto;
  }
  .primary-nav.is-open { transform: translateX(0); }
  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-3);
    width: 100%;
  }
  .primary-nav a { font-size: 1.35rem; }
  .nav-toggle { display: inline-block; }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-4);
  }
}