/* ─── Header ─── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 100;
  background: #F9F7F2;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 1px 0 rgba(0,0,0,0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 4vw;
  width: 100%;
  box-sizing: border-box;
}

/* ─── Logo ─── */
.header-logo {
  flex-shrink: 0;
}

.header-logo a {
  display: inline-block;
  position: relative;
  line-height: 0;
  height: 30px;
}

.header-logo .logo-default {
  height: 30px;
  width: auto;
  display: block;
  transition: opacity 0.25s ease;
}

.header-logo .logo-hover,
.header-logo .logo-white {
  display: none;
}

.header-logo a::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../img/logo-hover.png') no-repeat left center / 100% auto;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.header-logo a:hover .logo-default { opacity: 0; }
.header-logo a:hover::after { opacity: 1; }

/* Placeholder de texto cuando no hay logo */
.header-logo-text {
  font-family: var(--font-main);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--color-black);
  text-transform: uppercase;
}

/* ─── Nav desktop ─── */
.header-nav {
  display: flex;
  align-items: center;
  gap: 2vw;
}

.header-nav a {
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 400;
  font-style: normal;
  line-height: 1.2em;
  letter-spacing: 0em;
  text-transform: none;
  color: #000000;
  position: relative;
  transition: color var(--transition);
}

.header-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: #0006CF;
  transition: width var(--transition);
}

.header-nav a:hover {
  color: #0006CF;
}
.header-nav a:hover::after { width: 100%; }

.header-nav a.active {
  color: #000000;
}
.header-nav a.active::after {
  width: 100%;
  background: #000000;
  transition: background var(--transition);
}

.header-nav a.active:hover {
  color: #0006CF;
}
.header-nav a.active:hover::after {
  background: #0006CF;
  animation: underline-reveal var(--transition) ease forwards;
}

@keyframes underline-reveal {
  from { width: 0; }
  to   { width: 100%; }
}

/* ─── Language picker ─── */
.header-lang {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: 2rem;
}

.header-lang button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 400;
  line-height: 1.2em;
  letter-spacing: 0em;
  color: #000000;
  opacity: 0.4;
  transition: opacity var(--transition), color var(--transition);
  padding: 0;
  position: relative;
}

.header-lang button::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: #0006CF;
  transition: width var(--transition);
}

.header-lang button.active {
  opacity: 1;
  color: #000000;
}

.header-lang button:hover {
  opacity: 1;
  color: #0006CF;
}

.header-lang button.active::after {
  width: 100%;
  background: #000000;
  transition: background var(--transition);
}

.header-lang button.active:hover {
  color: #0006CF;
}
.header-lang button.active:hover::after {
  background: #0006CF;
  animation: underline-reveal var(--transition) ease forwards;
}

.header-lang button:hover::after {
  width: 100%;
}

.header-lang .lang-divider {
  width: 1px;
  height: 12px;
  background: var(--color-black);
  opacity: 0.3;
}

/* ─── Burger button (+ → ×) ─── */
.header-burger {
  display: none;
  position: relative;
  width: 20px;
  height: 20px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  flex-shrink: 0;
}

.burger-line {
  display: block;
  position: absolute;
  top: 50%;
  left: 0;
  width: 20px;
  height: 2.5px;
  background: var(--color-black);
  border-radius: 0;
  transform-origin: center;
  transition: transform 0.3s ease, background 0.3s ease;
}

/* línea horizontal */
.burger-line:nth-child(1) {
  transform: translateY(-50%);
}
/* línea vertical → forma la cruz + */
.burger-line:nth-child(2) {
  transform: translateY(-50%) rotate(90deg);
}

/* Al abrir: rota 45° → × */
.header-burger.open .burger-line:nth-child(1) {
  transform: translateY(-50%) rotate(45deg);
}
.header-burger.open .burger-line:nth-child(2) {
  transform: translateY(-50%) rotate(-45deg);
}

/* Líneas blancas cuando el menú está abierto */
.site-header.menu-open .burger-line {
  background: #ffffff;
}

/* ─── Mobile menu overlay ─── */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #0006CF;
  z-index: 99;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: 1.5rem;
  padding: 0 var(--site-gutter);
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0s linear 0.35s;
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
  visibility: visible;
  transition: opacity 0.35s ease, visibility 0s linear 0s;
}

.mobile-menu a,
.mobile-menu .mobile-lang {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.mobile-menu.open a:nth-child(1) { opacity: 1; transform: translateY(0); transition-delay: 0.08s; }
.mobile-menu.open a:nth-child(2) { opacity: 1; transform: translateY(0); transition-delay: 0.16s; }
.mobile-menu.open a:nth-child(3) { opacity: 1; transform: translateY(0); transition-delay: 0.24s; }
.mobile-menu.open .mobile-lang   { opacity: 1; transform: translateY(0); transition-delay: 0.32s; }

.mobile-menu a {
  font-family: var(--font-main);
  font-size: 3rem;
  font-weight: 400;
  letter-spacing: 0em;
  text-transform: none;
  color: #ffffff;
}
.mobile-menu a:hover { opacity: 0.65; }

.mobile-menu .mobile-lang {
  display: flex;
  gap: 1rem;
  position: absolute;
  bottom: 3rem;
  right: var(--site-gutter);
}

.mobile-menu .mobile-lang button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-main);
  font-size: 3rem;
  font-weight: 400;
  color: #ffffff;
  opacity: 0.5;
  transition: opacity var(--transition);
  padding: 0;
  line-height: 1.2em;
}
.mobile-menu .mobile-lang button.active { opacity: 1; }

.mobile-menu .mobile-lang .lang-divider {
  width: 1px;
  height: 1em;
  background: #ffffff;
  opacity: 0.4;
  align-self: center;
}

/* ─── Header cuando menú mobile está abierto ─── */
.site-header.menu-open {
  background: #0006CF;
}

.site-header.menu-open .burger-line {
  background: #ffffff;
}

.header-logo .logo-white {
  display: none;
  height: 30px;
  width: auto;
}

.site-header.menu-open .logo-default,
.site-header.menu-open .logo-hover {
  display: none;
}

.site-header.menu-open .logo-white {
  display: block;
}

/* ─── Responsive ─── */
@media (max-width: 767px) {
  :root { --header-height: 56px; }

  .header-nav,
  .header-lang {
    display: none;
  }

  .header-burger {
    display: flex;
  }

  .header-logo .logo-white {
    height: 30px;
    width: auto;
  }
}