/* Header — Studio Kayara */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: var(--z-header);
  transition:
    background-color 0.5s var(--ease-out-expo),
    height 0.5s var(--ease-out-expo),
    backdrop-filter 0.5s var(--ease-out-expo),
    box-shadow 0.5s var(--ease-out-expo);
  display: flex;
  align-items: center;
}

/* Transparent on homepage */
.header--transparent {
  background: transparent;
}

/* Solid on inner pages */
.header--solid {
  background: rgba(44, 42, 37, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* After scroll */
.header.is-scrolled {
  background: rgba(44, 42, 37, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  height: var(--header-height-scrolled);
  box-shadow: var(--shadow-nav);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Logo */
.header__logo {
  flex-shrink: 0;
  z-index: calc(var(--z-header) + 1);
}

.header__logo img {
  height: 48px;
  width: auto;
  transition: height 0.5s var(--ease-out-expo), opacity var(--transition-base);
}

.header__logo:hover img {
  opacity: 0.85;
}

.header.is-scrolled .header__logo img {
  height: 40px;
}

/* Navigation */
.header__nav {
  display: flex;
  align-items: center;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.header__nav-link {
  font-family: var(--font-body);
  font-size: var(--text-nav);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 1px;
  background: var(--color-blush);
  transition: width 0.4s var(--ease-out-expo), left 0.4s var(--ease-out-expo);
}

.header__nav-link:hover::after,
.header__nav-link.is-active::after {
  width: 100%;
  left: 0;
}

.header__nav-link:hover {
  color: var(--color-white);
}

.header__nav-link.is-active {
  color: var(--color-white);
}

/* CTA Button */
.header__cta {
  flex-shrink: 0;
  z-index: calc(var(--z-header) + 1);
}

.header__cta .btn {
  padding: 11px 28px;
  font-size: 12px;
}

/* Hamburger */
.header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  z-index: calc(var(--z-header) + 1);
  background: none;
  border: none;
  padding: 0;
}

.header__hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-white);
  transition: all 0.4s var(--ease-out-expo);
  transform-origin: center;
}

.header__hamburger.is-open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.header__hamburger.is-open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.header__hamburger.is-open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu Overlay */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--color-midnight);
  z-index: var(--z-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s var(--ease-out-expo), visibility 0.5s var(--ease-out-expo);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__list {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.mobile-menu__link {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 600;
  color: var(--color-white);
  display: block;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s var(--ease-out-expo), transform 0.5s var(--ease-out-expo), color var(--transition-fast);
}

.mobile-menu.is-open .mobile-menu__link {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger animation */
.mobile-menu.is-open .mobile-menu__link:nth-child(1) { transition-delay: 0.08s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(2) { transition-delay: 0.14s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(3) { transition-delay: 0.20s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(4) { transition-delay: 0.26s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(5) { transition-delay: 0.32s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(6) { transition-delay: 0.38s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(7) { transition-delay: 0.44s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(8) { transition-delay: 0.50s; }

.mobile-menu__link:hover {
  color: var(--color-blush);
}

.mobile-menu__cta {
  margin-top: var(--space-2xl);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease-out-expo) 0.56s, transform 0.5s var(--ease-out-expo) 0.56s;
}

.mobile-menu.is-open .mobile-menu__cta {
  opacity: 1;
  transform: translateY(0);
}