/* ============================================================
   Header & Navigation
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-light-gray);
  z-index: 1000;
}

.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  box-shadow:
    0 1px 2px rgba(17, 24, 39, 0.06),
    0 4px 8px rgba(17, 24, 39, 0.04),
    0 12px 24px rgba(17, 24, 39, 0.03);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.site-header--scrolled::after {
  opacity: 1;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ---- Left group (Logo + Nav) ---- */

.header-left {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-sm), 2vw, var(--space-lg));
  min-width: 0;
}

/* ---- Logo ---- */

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-primary);
  white-space: nowrap;
}
.header-logo:hover { color: var(--color-primary); }

.header-logo img {
  height: 48px;
  width: auto;
}

.header-logo-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-primary);
}
.header-logo-title {
  font-family: var(--font-accent);
  font-size: 0.6875rem;
  color: var(--color-mid-gray);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---- Navigation ---- */

.header-nav {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-xs), 1.5vw, var(--space-lg));
}

.header-nav a {
  font-family: var(--font-accent);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-dark-gray);
  letter-spacing: 0.04em;
  padding: 0.5rem clamp(0.25rem, 0.8vw, 0.75rem);
  position: relative;
  white-space: nowrap;
}
.header-nav a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-accent);
  transition: width var(--duration-fast) var(--ease-out);
}
.header-nav a:hover::after,
.header-nav a.active::after {
  width: 100%;
}
.header-nav a:hover { color: var(--color-primary); }
.header-nav a.active { color: var(--color-primary); }

/* ---- Header Right (lang + CTA) ---- */

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-shrink: 0;
}

/* ---- Language Toggle ---- */

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--font-accent);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-mid-gray);
  cursor: pointer;
  padding: 0.625rem 0.75rem;
  white-space: nowrap;
  border: 1px solid var(--color-light-gray);
  border-radius: 2px;
  background: transparent;
  transition: border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}
.lang-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-primary);
}
.lang-toggle:active { transform: scale(0.96); }

.header-cta {
  font-size: 0.8125rem;
  padding: 0.625rem 1.25rem;
  white-space: nowrap;
}

/* ---- Mobile Menu ---- */

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}
.menu-toggle:active { transform: scale(0.96); }
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}
.menu-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle.is-active span:nth-child(2) { opacity: 0; }
.menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-light-gray);
  box-shadow:
    0 1px 2px rgba(17, 24, 39, 0.06),
    0 4px 8px rgba(17, 24, 39, 0.04),
    0 12px 24px rgba(17, 24, 39, 0.03);
  padding: var(--space-md) 0;
  z-index: 999;
}
.mobile-nav.is-open { display: block; }

.mobile-nav a {
  display: block;
  padding: 0.875rem var(--space-md);
  font-family: var(--font-accent);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark-gray);
}
.mobile-nav a:hover { color: var(--color-primary); background: var(--color-off-white); }

.mobile-nav .lang-toggle {
  margin: var(--space-sm) var(--space-md);
}
.mobile-nav .btn {
  margin: var(--space-sm) var(--space-md);
  display: block;
  text-align: center;
}

/* ---- Body offset for fixed header ---- */
body { padding-top: var(--header-height); }

/* ---- Responsive ---- */

@media (max-width: 768px) {
  .site-header .container {
    padding: 0 var(--space-md);
  }
  .header-nav,
  .header-right {
    display: none;
  }
  .menu-toggle { display: flex; }
}