/* Header-specific styles for Karlovex
   Builds on base.css (colors, typography, layout)
*/

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(248, 250, 252, 0.96);
  backdrop-filter: blur(20px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

/* Brand */
.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--gray-900);
}

.site-header__logo-mark {
  position: relative;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 20%, #fdf2ff, transparent 55%),
              radial-gradient(circle at 70% 80%, #ede9fe, transparent 55%),
              linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.site-header__logo-orbit {
  position: absolute;
  inset: 7px;
  border-radius: 999px;
  border: 1px solid rgba(248, 250, 252, 0.7);
}

.site-header__logo-core {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(248, 250, 252, 0.4);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
}

.site-header__title {
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: var(--font-size-sm);
}

.site-header__subtitle {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
}

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

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

.nav-item {
  display: flex;
}

.nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  padding-block: 4px;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-primary);
}

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

.nav-item--cta .nav-link--cta {
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: linear-gradient(135deg, var(--color-accent-soft), var(--color-primary-soft));
  color: var(--color-primary-strong);
  font-weight: 600;
}

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

.nav-item--cta .nav-link--cta:hover,
.nav-item--cta .nav-link--cta:focus-visible {
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
  color: #ffffff;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

/* Mobile nav toggle (structure in base.css, here we refine) */
.nav-toggle {
  cursor: pointer;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Mobile behaviour: menu hidden by default, opened via JS */
@media (max-width: 900px) {
  .site-header__inner {
    gap: var(--space-4);
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: var(--header-height);
    background-color: rgba(248, 250, 252, 0.98);
    border-bottom: 1px solid var(--color-border-subtle);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
    transform-origin: top center;
    transform: scaleY(0.96);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--transition-normal),
      visibility var(--transition-normal),
      transform var(--transition-normal);
  }

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

  .nav-list {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-3) var(--space-4) var(--space-4);
  }

  .nav-item {
    width: 100%;
  }

  .nav-link,
  .nav-item--cta .nav-link--cta {
    display: block;
    width: 100%;
    padding-block: var(--space-2);
  }

  .nav-item--cta .nav-link--cta {
    margin-top: var(--space-2);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .site-header__subtitle {
    display: none;
  }
}