/**
 * Atlas Vertical – Site header
 * Clean, confident, editorial. Inspired by premium Ghost themes.
 * Logo left, centered navigation, actions right.
 */

.site-header {
  position: relative;
  border-bottom: 1px solid var(--color-border);
  transition: padding 0.3s ease, box-shadow 0.3s ease;
}

.site-header.is-shrunk .site-header__inner {
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  max-width: var(--container-wide);
  margin-inline: auto;
  padding: var(--space-md) var(--space-md);
  transition: padding 0.3s ease;
}

/* Logo */
.site-header__logo {
  flex-shrink: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-decoration: none;
}

.site-header__logo:hover {
  text-decoration: none;
}

.site-header__logo img {
  display: block;
  max-height: 32px;
}

/* Navigation — centered between logo and actions */
.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}

.site-nav a {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.25s ease, background-color 0.25s ease;
}

.site-nav a:hover {
  color: var(--color-text);
  background-color: var(--color-bg-alt);
  text-decoration: none;
}

.site-nav .nav-current a {
  color: var(--color-text);
  font-weight: 600;
  background-color: var(--color-bg-alt);
}

.site-nav a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 8px;
}

/* ---------------------------------------------------------------
   Nav style: pill buttons
   Activated via Ghost Admin → Design → nav_style = "buttons".
   --------------------------------------------------------------- */

.site-header--nav-buttons .site-nav a {
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--color-nav-btn, var(--color-accent));
  color: #fff;
  font-weight: 600;
}

.site-header--nav-buttons .site-nav a:hover {
  filter: brightness(1.12);
  background: var(--color-nav-btn, var(--color-accent));
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.site-header--nav-buttons .site-nav .nav-current a {
  color: #fff;
  background: var(--color-nav-btn, var(--color-accent));
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.3);
}

.site-header--nav-buttons .site-nav a:focus-visible {
  outline: 2px solid var(--color-nav-btn, var(--color-accent));
  outline-offset: 3px;
}

/* ---------------------------------------------------------------
   Desktop refinements
   --------------------------------------------------------------- */

@media (min-width: 640px) {
  .site-header__inner {
    padding: var(--space-md) var(--space-lg);
  }

  .site-nav ul {
    gap: var(--space-xs);
  }

  .site-nav a {
    padding: 8px 16px;
  }
}

/* ---------------------------------------------------------------
   Mobile: compact spacing
   --------------------------------------------------------------- */

@media (max-width: 639px) {
  .site-header__inner {
    gap: var(--space-sm);
  }

  .site-nav a {
    padding: 5px 10px;
    font-size: 0.8125rem;
  }

  .site-header--nav-buttons .site-nav a {
    padding: 6px 12px;
    font-size: 0.8125rem;
  }
}