/* Header styles for COF ART LTD */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  width: 100%;
  backdrop-filter: blur(16px);
  background: linear-gradient(to bottom, rgba(5, 7, 10, 0.96), rgba(5, 7, 10, 0.88));
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
}

.site-header__logo-mark {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.9rem;
  background: radial-gradient(circle at 30% 20%, rgba(245, 166, 35, 0.95), transparent 55%),
              radial-gradient(circle at 70% 80%, rgba(245, 166, 35, 0.3), transparent 55%),
              #05070a;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.05), var(--shadow-xs);
  position: relative;
}

.site-header__logo-mark::after {
  content: '';
  position: absolute;
  inset: 24%;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.32);
}

.site-header__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-header__subtitle {
  display: block;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
}

/* Navigation */

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.site-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
  padding: 0.4rem 0;
}

.site-header__nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
  transition: width var(--transition-base);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--gray-50);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  width: 100%;
}

.site-header__nav-item--cta .site-header__nav-link--cta {
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(245, 166, 35, 0.8);
  background: rgba(245, 166, 35, 0.08);
  color: var(--gray-50);
}

.site-header__nav-item--cta .site-header__nav-link--cta::after {
  display: none;
}

.site-header__nav-item--cta .site-header__nav-link--cta:hover,
.site-header__nav-item--cta .site-header__nav-link--cta:focus-visible {
  background: rgba(245, 166, 35, 0.16);
  border-color: var(--color-primary);
}

.site-header__contact-meta {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  font-size: var(--font-size-xs);
}

.site-header__contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-text-muted);
}

.site-header__contact-link i {
  font-size: 0.8rem;
  color: var(--color-primary);
}

.site-header__contact-link:hover,
.site-header__contact-link:focus-visible {
  color: var(--gray-50);
}

/* Mobile toggle */

.site-header__toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(0, 0, 0, 0.45);
  align-items: center;
  justify-content: center;
  padding: 0;
}

.site-header__toggle-bar {
  width: 1.25rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-100);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.site-header__toggle-bar + .site-header__toggle-bar {
  margin-top: 0.2rem;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

/* Responsive behaviour */

@media (max-width: 960px) {
  .site-header__inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .site-header__toggle {
    display: flex;
    flex-direction: column;
  }

  .site-header__nav {
    position: fixed;
    inset: 0 0 auto 0;
    top: 3.5rem;
    display: block;
    background: radial-gradient(circle at top left, rgba(245, 166, 35, 0.18), transparent 60%),
                rgba(5, 7, 10, 0.98);
    padding: var(--space-4);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

  .site-header__nav--open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
  }

  .site-header__nav-link {
    font-size: var(--font-size-base);
  }

  .site-header__nav-item--cta .site-header__nav-link--cta {
    width: 100%;
    justify-content: center;
    text-align: center;
  }

  .site-header__contact-meta {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: var(--space-3);
  }
}

@media (max-width: 640px) {
  .site-header__subtitle {
    display: none;
  }
}

/* No-JS fallback: ensure nav is visible if JS is disabled and toggle not active */

.no-js .site-header__nav {
  position: static;
  transform: none;
  opacity: 1;
  visibility: visible;
  padding: 0;
  background: transparent;
}

.no-js .site-header__toggle {
  display: none;
}