/**
 * 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: 1;
  min-width: 0;
  max-width: 100%;
  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;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

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

/* Nav cluster — centered between logo and actions (primary only; secondary is in footer) */
.site-header__nav-cluster {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  min-width: 0;
  flex-wrap: wrap;
}

.site-nav {
  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;
}

/* Primary nav: social URLs render as icon + screen-reader label (partials/navigation.hbs) */
.site-nav a:has(.site-nav__icon) {
  padding: 8px 10px;
}

.site-nav__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.site-nav__icon-svg {
  display: block;
  width: 22px;
  height: 22px;
}

/* ---------------------------------------------------------------
   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: var(--color-on-accent);
  font-weight: 600;
}

.site-header--nav-buttons .site-nav a:has(.site-nav__icon) {
  padding: 10px 14px;
}

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

[data-theme="dark"] .site-header--nav-buttons .site-nav a:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-header--nav-buttons .site-nav a:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  }
}

.site-header--nav-buttons .site-nav .nav-current a {
  color: var(--color-on-accent);
  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
   --------------------------------------------------------------- */

/* Search + theme + menu (menu hidden on wide viewports via rule below) */
.site-header__end {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* ----------------------------------------------------------------
   Mobile navigation drawer (≤639px): no horizontal nav strip overflow
   ---------------------------------------------------------------- */

.site-header__nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.22s ease, visibility 0.22s ease;
}

.site-header--nav-open .site-header__nav-backdrop {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

[data-theme="dark"] .site-header__nav-backdrop {
  background: rgba(0, 0, 0, 0.62);
}

@media (max-width: 639px) {
  body.site-header--nav-open {
    overflow: hidden;
    overscroll-behavior: none;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-header__nav-backdrop {
    background: rgba(0, 0, 0, 0.62);
  }
}

/* Hamburger: 44×44 tap target; hidden on desktop */
.site-header__menu-toggle {
  display: none;
  box-sizing: border-box;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color 0.2s, background-color 0.2s;
}

.site-header__menu-toggle:hover {
  border-color: var(--color-text-muted);
}

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

.site-header__menu-bars,
.site-header__menu-bars::before,
.site-header__menu-bars::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.2s ease, top 0.2s ease, background 0.2s ease;
}

.site-header__menu-bars {
  position: relative;
}

.site-header__menu-bars::before,
.site-header__menu-bars::after {
  content: '';
  position: absolute;
  left: 0;
}

.site-header__menu-bars::before {
  top: -6px;
}

.site-header__menu-bars::after {
  top: 6px;
}

.site-header--nav-open .site-header__menu-bars {
  background: transparent;
}

.site-header--nav-open .site-header__menu-bars::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header--nav-open .site-header__menu-bars::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav-backdrop,
  .site-header__menu-bars,
  .site-header__menu-bars::before,
  .site-header__menu-bars::after {
    transition: none;
  }
}

@media (max-width: 639px) {
  .site-header__inner {
    gap: var(--space-sm);
    position: relative;
    z-index: 220;
    background: var(--color-bg);
    padding-inline: max(var(--space-sm), env(safe-area-inset-left)) max(var(--space-sm), env(safe-area-inset-right));
  }

  .site-header--nav-open {
    z-index: 300;
  }

  .page-videos .site-header.site-header--nav-open {
    z-index: 300;
  }

  .site-header__menu-toggle {
    display: inline-flex;
  }

  /* Inline nav strip hidden — drawer holds links */
  .site-header__nav-cluster {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 210;
    flex: none;
    width: 100%;
    max-width: min(100vw, 400px);
    margin: 0 0 0 auto;
    padding: calc(env(safe-area-inset-top, 0px) + 56px) var(--space-lg) max(var(--space-xl), env(safe-area-inset-bottom))
      max(var(--space-lg), env(safe-area-inset-left));
    box-sizing: border-box;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.12);
    transform: translateX(100%);
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.26s cubic-bezier(0.25, 0.46, 0.45, 0.94), visibility 0.26s;
  }

  [data-theme="dark"] .site-header__nav-cluster {
    box-shadow: -8px 0 40px rgba(0, 0, 0, 0.45);
  }

  .site-header--nav-open .site-header__nav-cluster {
    transform: translateX(0);
    visibility: visible;
    pointer-events: auto;
  }

  .site-header__nav-cluster .site-nav {
    width: 100%;
    justify-content: stretch;
  }

  .site-header__nav-cluster .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    flex-wrap: nowrap;
    white-space: normal;
    gap: var(--space-md);
    width: 100%;
  }

  .site-header__nav-cluster .site-nav li {
    width: 100%;
  }

  .site-header__nav-cluster .site-nav a {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    min-height: 48px;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: 10px;
    box-sizing: border-box;
  }

  .site-header__nav-cluster .site-nav a:has(.site-nav__icon) {
    min-width: 48px;
    min-height: 48px;
    width: fit-content;
    max-width: 100%;
    padding: 12px 14px;
    justify-content: center;
  }

  .site-header__nav-cluster .site-nav__icon-svg {
    width: 24px;
    height: 24px;
  }

  .site-header--nav-buttons .site-header__nav-cluster .site-nav a {
    justify-content: center;
    text-align: center;
  }

  @media (prefers-reduced-motion: reduce) {
    .site-header__nav-cluster {
      transition: none;
    }
  }
}

@media (max-width: 390px) {
  .site-header__inner {
    gap: var(--space-xs);
    padding-inline: max(10px, env(safe-area-inset-left)) max(10px, env(safe-area-inset-right));
  }

  .site-header__logo {
    font-size: 1rem;
  }

  .site-header__end {
    gap: 6px;
  }
}

@media (min-width: 640px) {
  .site-header__nav-backdrop {
    display: none !important;
  }

  .site-header__inner {
    z-index: auto;
  }
}