/* ============================================================
   header.css — Site header and navigation
   Two-row layout: logo centered on top, nav centered below.
   Depends on: css/base.css
   ============================================================ */

/* ---- Sticky header shell ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border-soft);
}

/* ============================================================
   Row 1 — Logo
   ============================================================ */
.header-logo-row {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--header-height);
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

/* ---- Logo ---- */
.logo {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-sm);
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.75;
}

.logo__mark {
  height: 54px;        /* +8% from 50px */
  width: auto;
  flex-shrink: 0;
  position: relative;
  top: -2px;           /* optical lift — preserved */
}

.logo__text {
  display: flex;
  flex-direction: column;
  align-items: center; /* centers "STUDIO" under "Gachafruit" */
  gap: 3px;            /* slightly more separation so the two lines breathe */
}

.logo__name {
  font-size: 1.485rem; /* +8% from 1.375rem */
  font-weight: var(--font-weight-black);
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1;
}

.logo__sub {
  font-size: 0.756rem; /* +8% from 0.7rem */
  font-weight: var(--font-weight-semibold);
  color: var(--color-muted);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  line-height: 1;
}

/* ============================================================
   Row 2 — Desktop navigation
   ============================================================ */
.header-nav {
  display: flex;
  justify-content: center;
  border-top: 1px solid var(--color-border-soft);
  padding-block: 10px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-3xl);
}

.nav-link {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  position: relative;
  transition: color var(--transition-fast);
}

/* Underline-on-hover */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--color-text);
}

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

/* ============================================================
   Hamburger (mobile only — positioned to right of logo row)
   ============================================================ */
.hamburger {
  display: none;
  position: absolute;
  right: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 44px;
  padding: 0;
  color: var(--color-text);
}

.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

/* Bars animate to X when open */
.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ============================================================
   Mobile nav drawer
   ============================================================ */
.mobile-nav {
  max-height: 0;
  overflow: hidden;
  background-color: var(--color-bg);
  border-top: 1px solid transparent;
  transition:
    max-height 0.3s ease,
    border-color 0.3s ease;
}

.mobile-nav.is-open {
  max-height: 240px;
  border-top-color: var(--color-border-soft);
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  gap: var(--space-xs);
}

.mobile-nav-list .nav-link {
  display: block;
  padding-block: var(--space-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-transform: none;
  letter-spacing: 0;
  color: var(--color-text);
}

.mobile-nav-list .nav-link::after {
  display: none;
}

.mobile-nav-list .nav-link:hover {
  color: var(--color-accent);
}

/* ============================================================
   Responsive breakpoint
   ============================================================ */
@media (max-width: 768px) {
  /* Hide desktop nav row entirely */
  .header-nav {
    display: none;
  }

  /* Show hamburger */
  .hamburger {
    display: flex;
  }
}