/* ============================================================
   THE SKIN TREE — LAYOUT STYLES
   ============================================================ */

/* ── NAVBAR ─────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  padding: 1.5rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--dur-slow) var(--ease-silk),
              padding var(--dur-normal) var(--ease-silk),
              box-shadow var(--dur-slow) var(--ease-silk);
}

.navbar.is-scrolled {
  background: var(--c-glass-bg);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  box-shadow: 0 1px 0 var(--c-border), var(--shadow-sm);
  padding-block: 1rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.nav-logo__icon { width: 44px; height: 44px; flex-shrink: 0; }

.nav-logo__text {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.nav-logo__name {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--c-text-primary);
  letter-spacing: 0.01em;
  line-height: 1;
  transition: color var(--dur-normal);
}

.nav-logo__sub {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-widest);
  text-transform: uppercase;
  color: var(--c-text-muted);
  line-height: 1;
}

.navbar--hero .nav-logo__name { color: var(--c-off-white); }
.navbar--hero .nav-logo__sub  { color: rgba(253,251,247,0.6); }
.navbar--hero.is-scrolled .nav-logo__name { color: var(--c-text-primary); }
.navbar--hero.is-scrolled .nav-logo__sub  { color: var(--c-text-muted); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  color: var(--c-text-muted);
  text-decoration: none;
  position: relative;
  transition: color var(--dur-fast);
  padding-block: var(--space-1);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1.5px;
  background: var(--c-terracotta);
  border-radius: var(--radius-full);
  transition: width var(--dur-normal) var(--ease-out);
}

.nav-link:hover { color: var(--c-terracotta); }
.nav-link:hover::after, .nav-link.is-active::after { width: 100%; }
.nav-link.is-active { color: var(--c-terracotta); }

.navbar--hero .nav-link { color: rgba(253,251,247,0.80); }
.navbar--hero .nav-link:hover { color: var(--c-off-white); }
.navbar--hero.is-scrolled .nav-link { color: var(--c-text-muted); }
.navbar--hero.is-scrolled .nav-link:hover { color: var(--c-terracotta); }

.nav-cta {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  padding: var(--space-3) var(--space-6);
  background: var(--c-terracotta);
  color: white;
  border-radius: var(--radius-full);
  transition: background var(--dur-normal), box-shadow var(--dur-normal), transform var(--dur-fast) var(--ease-spring);
}
.nav-cta:hover {
  background: var(--c-terracotta-light);
  box-shadow: 0 8px 24px var(--c-terracotta-glow);
  transform: translateY(-1px);
}

.navbar--hero .nav-cta {
  background: transparent;
  border: 1px solid rgba(253,251,247,0.5);
  color: var(--c-off-white);
}
.navbar--hero .nav-cta:hover {
  background: var(--c-terracotta);
  border-color: var(--c-terracotta);
}
.navbar--hero.is-scrolled .nav-cta {
  background: var(--c-terracotta);
  border-color: var(--c-terracotta);
  color: white;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: var(--space-2);
  cursor: pointer;
  background: none;
  border: none;
}

.nav-hamburger span {
  display: block;
  height: 1.5px;
  background: var(--c-text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--dur-normal) var(--ease-spring), opacity var(--dur-fast), width var(--dur-normal) var(--ease-out);
}
.nav-hamburger span:nth-child(2) { width: 70%; }
.navbar--hero .nav-hamburger span { background: var(--c-off-white); }
.navbar--hero.is-scrolled .nav-hamburger span { background: var(--c-text-primary); }
.nav-hamburger.is-open span:nth-child(1) { transform: rotate(45deg) translate(4.5px, 4.5px); }
.nav-hamburger.is-open span:nth-child(2) { opacity: 0; width: 100%; }
.nav-hamburger.is-open span:nth-child(3) { transform: rotate(-45deg) translate(4.5px, -4.5px); }

.nav-mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) - 1);
  background: var(--c-off-white);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-24) var(--gutter);
}
.nav-mobile-menu.is-open { display: flex; }
.nav-mobile-menu .nav-link {
  font-family: var(--font-display);
  font-size: var(--fs-3xl);
  color: var(--c-text-primary);
  font-weight: var(--fw-medium);
}

/* ── SECTION HEADERS ────────────────────────────────────── */
.section-header {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: clamp(3rem, 5vw, 5rem);
}
.section-header .eyebrow { display: block; margin-bottom: var(--space-4); }
.section-header h2 { margin-bottom: var(--space-5); }
.section-header p { font-size: var(--fs-md); line-height: var(--lh-relaxed); }

/* ── GRIDS ──────────────────────────────────────────────── */
.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 6vw, 6rem);
  align-items: center;
}
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(1.5rem, 2.5vw, 2rem); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem); }

/* ── FOOTER ─────────────────────────────────────────────── */
.footer {
  background-color: var(--c-umber);
  color: var(--c-text-on-dark);
  padding-top: clamp(4rem, 8vw, 7rem);
  padding-bottom: 2rem;
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: clamp(2rem, 4vw, 4rem);
  padding-bottom: clamp(3rem, 5vw, 5rem);
  border-bottom: 1px solid var(--c-border-dark);
  margin-bottom: 2rem;
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: var(--fw-medium);
  color: var(--c-off-white);
  margin-bottom: var(--space-4);
}

.footer__brand-desc {
  font-size: var(--fs-sm);
  color: var(--c-text-on-dark-muted);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-6);
  max-width: 320px;
}

.footer__socials { display: flex; gap: var(--space-3); }

.footer__social-link {
  width: 38px; height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--c-border-dark);
  display: flex; align-items: center; justify-content: center;
  color: var(--c-text-on-dark-muted);
  font-size: var(--fs-sm);
  transition: border-color var(--dur-fast), color var(--dur-fast), background var(--dur-fast);
}
.footer__social-link:hover { border-color: var(--c-terracotta); color: white; background: var(--c-terracotta); }

.footer__col-title {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-widest);
  text-transform: uppercase;
  color: var(--c-sand);
  margin-bottom: var(--space-5);
}

.footer__links { display: flex; flex-direction: column; gap: var(--space-3); }
.footer__link { font-size: var(--fs-sm); color: var(--c-text-on-dark-muted); transition: color var(--dur-fast); }
.footer__link:hover { color: var(--c-cream); }

.footer__contact-item {
  display: flex; align-items: flex-start; gap: var(--space-3);
  font-size: var(--fs-sm); color: var(--c-text-on-dark-muted);
  margin-bottom: var(--space-4); line-height: var(--lh-normal);
}
.footer__contact-icon { font-size: var(--fs-base); flex-shrink: 0; margin-top: 2px; color: var(--c-terracotta-light); }

.footer__newsletter { display: flex; gap: var(--space-2); margin-top: var(--space-4); }
.footer__newsletter input {
  flex: 1; padding: var(--space-3) var(--space-4);
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--c-border-dark);
  border-radius: var(--radius-full);
  color: var(--c-off-white); font-size: var(--fs-sm);
  outline: none; transition: border-color var(--dur-fast);
}
.footer__newsletter input:focus { border-color: var(--c-terracotta); }
.footer__newsletter input::placeholder { color: var(--c-text-on-dark-muted); }
.footer__newsletter button {
  padding: var(--space-3) var(--space-5);
  background: var(--c-terracotta); color: white;
  border-radius: var(--radius-full); font-size: var(--fs-sm);
  font-weight: var(--fw-semibold); transition: background var(--dur-fast);
}
.footer__newsletter button:hover { background: var(--c-terracotta-light); }

.footer__bottom {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: var(--space-4);
}
.footer__copy { font-size: var(--fs-xs); color: var(--c-text-on-dark-muted); }
.footer__legal { display: flex; gap: var(--space-5); }
.footer__legal a { font-size: var(--fs-xs); color: var(--c-text-on-dark-muted); transition: color var(--dur-fast); }
.footer__legal a:hover { color: var(--c-cream); }

/* ── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-hamburger { display: flex; }
  .split-layout { grid-template-columns: 1fr; gap: var(--space-10); }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; gap: var(--space-8); }
  .footer__bottom { flex-direction: column; text-align: center; }
}