/* ============================================
   BLAFA — components.css
   Nav · Boutons · Footer · Overlays
   ============================================ */

/* ═══════════════════════════════════════════
   NAVIGATION — Unifiée, prévisible, fluide
   ═══════════════════════════════════════════ */

.nav {
  position: fixed;
  top: clamp(0.75rem, 2vw, 1.125rem);
  left: var(--margin-x);
  right: var(--margin-x);
  width: auto;
  max-width: 1180px;
  height: 64px;
  margin-inline: auto;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem 0.5rem 0.875rem;

  background: color-mix(in srgb, var(--paper) 88%, transparent);
  color: var(--ink);
  box-shadow: 0 10px 34px rgba(10, 15, 12, 0.08);

  transition:
    background var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    backdrop-filter var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);

  border: 1px solid color-mix(in srgb, var(--stone-line) 80%, transparent);
  border-radius: var(--radius-full);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
}

/* État "over-hero" : nav transparente sur le hero vert, texte clair */
.nav[data-nav-state="over-hero"] {
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  color: var(--ink);
  border-color: color-mix(in srgb, var(--paper) 56%, transparent);
  box-shadow: 0 12px 38px rgba(4, 19, 12, 0.18);
}

/* État "scrolled" : fond flou crème, texte sombre */
.nav[data-nav-state="scrolled"] {
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  color: var(--ink);
  border-color: color-mix(in srgb, var(--stone-line) 88%, transparent);
  box-shadow: 0 12px 36px rgba(10, 15, 12, 0.10);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}

/* Brand */
.nav__brand {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  line-height: 1;
  color: inherit;
  border-radius: var(--radius-full);
  transition:
    background var(--dur-base) var(--ease-out),
    opacity var(--dur-fast) var(--ease-out),
    transform var(--dur-base) var(--ease-spring);
}

.nav__brand:hover {
  opacity: 0.75;
  transform: scale(1.03);
}

.nav__logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 50%;
}

/* Menu desktop */
.nav__menu {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, var(--space-6));
}

.nav__link {
  position: relative;
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: inherit;
  padding: var(--space-2) 0;
  transition:
    color var(--dur-fast) var(--ease-out),
    opacity var(--dur-fast) var(--ease-out);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform var(--dur-base) var(--ease-out-expo);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  transform: scaleX(1);
  transform-origin: left center;
}

.nav__link.is-active {
  color: var(--sage);
}

/* CTA dans la nav */
.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.625rem 1.125rem;
  border: 1px solid currentColor;
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: 500;
  line-height: 1;
  transition:
    background var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
}

.nav__cta:hover {
  background: currentColor;
  transform: translateY(-1px);
}

.nav__cta:hover > * {
  color: var(--paper);
}

.nav[data-nav-state="over-hero"] .nav__cta:hover {
  background: var(--forest);
}
.nav[data-nav-state="over-hero"] .nav__cta:hover > * {
  color: var(--paper);
}

.nav[data-nav-state="scrolled"] .nav__cta:hover > *,
.nav[data-nav-state="default"] .nav__cta:hover > * {
  color: var(--paper);
}

/* Burger (mobile uniquement) */
.nav__burger {
  display: none;
  width: 46px;
  height: 46px;
  position: relative;
  z-index: calc(var(--z-nav) + 10);
  border-radius: var(--radius-full);
  touch-action: manipulation;
  color: var(--ink);
  transition:
    background var(--dur-fast) var(--ease-out),
    transform var(--dur-base) var(--ease-spring);
}

.nav__burger:hover {
  background: color-mix(in srgb, var(--ink) 8%, transparent);
  transform: scale(1.03);
}

.nav__burger span {
  position: absolute;
  left: 50%;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transform: translateX(-50%);
  transition:
    transform var(--dur-base) var(--ease-out-expo),
    top var(--dur-base) var(--ease-out-expo),
    opacity var(--dur-fast) var(--ease-out);
}

.nav__burger span:nth-child(1) { top: calc(50% - 4px); }
.nav__burger span:nth-child(2) { top: calc(50% + 4px); }

.nav__burger.is-open span:nth-child(1) {
  top: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
}
.nav__burger.is-open span:nth-child(2) {
  top: 50%;
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* Menu mobile (overlay plein écran) */
@media (max-width: 900px) {
  .nav {
    top: calc(0.75rem + env(safe-area-inset-top));
    left: max(0.875rem, env(safe-area-inset-left));
    right: max(0.875rem, env(safe-area-inset-right));
    height: 58px;
    padding: 0.375rem 0.5rem 0.375rem 0.625rem;
  }

  .nav__brand {
    width: 44px;
    height: 44px;
  }

  .nav__logo {
    width: 38px;
    height: 38px;
  }

  .nav__burger { display: block; }

  .nav__menu {
    position: fixed;
    inset: auto;
    top: calc(-1 * (0.75rem + env(safe-area-inset-top)) - 1px);
    left: calc(-1 * max(0.875rem, env(safe-area-inset-left)) - 1px);
    width: calc(100vw + 2px);
    height: 100vh;
    height: 100dvh;
    min-height: 100svh;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: var(--space-5);
    padding: calc(var(--nav-h) + var(--space-8) + env(safe-area-inset-top)) var(--margin-x) calc(var(--space-7) + env(safe-area-inset-bottom));
    background: var(--paper);
    color: var(--ink);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;

    opacity: 0;
    visibility: hidden;
    transform: translate3d(0, -10px, 0) scale(0.98);
    transition:
      opacity var(--dur-base) var(--ease-out),
      transform var(--dur-slow) var(--ease-out-expo),
      visibility 0s linear var(--dur-base);
    pointer-events: none;
    z-index: calc(var(--z-nav) + 1);
  }

  .nav__menu.is-open {
    opacity: 1;
    visibility: visible;
    transform: translate3d(0, 0, 0) scale(1);
    transition-delay: 0s;
    pointer-events: auto;
  }

  .nav__menu li {
    width: 100%;
  }

  .nav__link {
    font-family: var(--font-display);
    font-size: clamp(2rem, 7vw, 3rem);
    font-weight: 500;
    letter-spacing: -0.02em;
    padding: var(--space-2) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
  }

  .nav__menu.is-open .nav__link {
    opacity: 1;
    transform: translateY(0);
  }

  .nav__menu.is-open li:nth-child(1) .nav__link { transition-delay: 0.15s; }
  .nav__menu.is-open li:nth-child(2) .nav__link { transition-delay: 0.20s; }
  .nav__menu.is-open li:nth-child(3) .nav__link { transition-delay: 0.25s; }
  .nav__menu.is-open li:nth-child(4) .nav__link { transition-delay: 0.30s; }
  .nav__menu.is-open li:nth-child(5) .nav__cta { transition-delay: 0.35s; }

  .nav__cta {
    font-size: 1rem;
    padding: 0.875rem 1.5rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
    width: fit-content;
    max-width: 100%;
  }

  .nav__menu.is-open .nav__cta {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ═══════════════════════════════════════════
   BOUTONS — Système cohérent
   ═══════════════════════════════════════════ */

.btn {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  --btn-border: var(--ink);
  --btn-bg-hover: var(--forest);
  --btn-border-hover: var(--forest);

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  padding: 0.875rem 1.5rem;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1;
  white-space: nowrap;
  border: 1px solid var(--btn-border);
  border-radius: var(--radius-full);
  background: var(--btn-bg);
  color: var(--btn-fg);
  cursor: pointer;
  user-select: none;

  transition:
    background var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out),
    transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);

  will-change: transform;
}

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

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
  transition-duration: 100ms;
}

.btn__arrow {
  display: inline-flex;
  transition: transform var(--dur-base) var(--ease-out-expo);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* Variantes */
.btn--primary {
  --btn-bg: var(--forest);
  --btn-fg: var(--paper);
  --btn-border: var(--forest);
  --btn-bg-hover: var(--forest-deep);
  --btn-border-hover: var(--forest-deep);
}

.btn--ink {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  --btn-border: var(--ink);
  --btn-bg-hover: var(--forest);
  --btn-border-hover: var(--forest);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  --btn-border: var(--ink);
  --btn-bg-hover: var(--ink);
  --btn-border-hover: var(--ink);
}

.btn--ghost:hover {
  color: var(--paper);
}

/* Ghost sur fond sombre */
.section--ink .btn--ghost,
.hero .btn--ghost,
.finale .btn--ghost {
  --btn-fg: var(--paper);
  --btn-border: rgba(255, 255, 255, 0.3);
  --btn-bg-hover: var(--paper);
}

.section--ink .btn--ghost:hover,
.hero .btn--ghost:hover,
.finale .btn--ghost:hover {
  color: var(--ink);
  border-color: var(--paper);
}

/* Primary sur fond sombre = crème */
.section--ink .btn--primary,
.hero .btn--primary,
.finale .btn--primary {
  --btn-bg: var(--paper);
  --btn-fg: var(--ink);
  --btn-border: var(--paper);
  --btn-bg-hover: var(--sage-light);
  --btn-border-hover: var(--sage-light);
}

.section--ink .btn--primary:hover,
.hero .btn--primary:hover,
.finale .btn--primary:hover {
  color: var(--ink);
}

/* Lien souligné (pas de bordure) */
.btn--link {
  --btn-bg: transparent;
  --btn-fg: currentColor;
  --btn-border: transparent;
  padding: 0;
  border: none;
  position: relative;
  border-radius: 0;
}

.btn--link:hover {
  background: transparent;
  transform: none;
  box-shadow: none;
}

.btn--link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1px;
  background: currentColor;
  transform-origin: left center;
  transition: transform var(--dur-base) var(--ease-out-expo);
}

.btn--link:hover::after {
  transform-origin: right center;
  transform: scaleX(0);
}

/* Taille large */
.btn--lg {
  padding: 1.0625rem 1.75rem;
  font-size: var(--fs-base);
}

/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */

.footer {
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-9) var(--margin-x) var(--space-5);
}

.footer__inner {
  max-width: var(--container);
  margin-inline: auto;
}

.footer > .footer__grid,
.footer > .footer__bottom,
.footer > .rule {
  max-width: var(--container);
  margin-inline: auto;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--paper);
  margin-bottom: var(--space-4);
}

.footer__brand-name .dot {
  color: var(--sage);
}

.footer__tagline {
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
  color: var(--stone-soft);
  max-width: 38ch;
}

.footer__col-title {
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: var(--ls-widest);
  text-transform: uppercase;
  color: var(--stone);
  margin-bottom: var(--space-4);
}

.footer__col-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__col-list a {
  font-size: var(--fs-sm);
  color: var(--stone-soft);
  transition: color var(--dur-fast) var(--ease-out);
  width: fit-content;
}

.footer__col-list a:hover {
  color: var(--paper);
}

.footer__rule {
  height: 1px;
  background: rgba(255, 255, 255, 0.08);
  border: none;
  margin-bottom: var(--space-5);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer__meta {
  font-size: var(--fs-xs);
  color: var(--stone);
  letter-spacing: 0.02em;
}

@media (max-width: 900px) {
  .footer {
    padding-top: var(--space-7);
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6) var(--space-5);
    margin-bottom: var(--space-6);
  }

  .footer__brand {
    grid-column: 1 / -1;
    margin-bottom: var(--space-2);
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}

@media (max-width: 480px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}

/* ═══════════════════════════════════════════
   PAGE TRANSITION (overlay slide)
   ═══════════════════════════════════════════ */

.page-transition {
  position: fixed;
  inset: 0;
  background: var(--ink);
  z-index: var(--z-transition);
  pointer-events: none;
  transform: translateY(100%);
  transition: transform var(--dur-slow) var(--ease-in-out);
  will-change: transform;
}

.page-transition.is-entering {
  transform: translateY(0);
}

.page-transition.is-exiting {
  transform: translateY(-100%);
}

/* ═══════════════════════════════════════════
   CHECKMARK ICON — SVG externalisé
   ═══════════════════════════════════════════ */

.check-icon {
  width: 1.375rem;
  height: 1.375rem;
  flex-shrink: 0;
  color: var(--forest);
}

.check-icon circle {
  fill: currentColor;
}

.check-icon path {
  stroke: var(--paper);
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feat-icon {
  width: 20px;
  height: 20px;
  min-width: 20px;
  flex-shrink: 0;
  color: var(--sage) !important;
  margin-top: 0.15rem;
}