/**
 * ŒnoT Header Component
 * Mobile-first, BEM-structured, single-source-of-truth header
 * No JS required, accessible, performant
 * 
 * NOTE: Uses --header-* prefixed variables to avoid conflicts with oenot-styles.css
 */

/* ============================================
   DESIGN TOKENS (Header-specific, prefixed to avoid conflicts)
   ============================================ */
:root {
  /* Header Colors - Prefixed to avoid conflicts with main styles */
  --header-bg: #121826;
  --header-grad-1: #1a1030;
  --header-grad-2: #2a0f33;
  --header-accent: #ff2d8b;
  --header-text: #e6e6f0;
  --header-text-muted: #b6b6c6;
  
  /* Header Sizing */
  --header-icon-size: 20px;
  --header-radius: 14px;
  --header-gap: 18px;
  --header-height: 64px;
  
  /* Header Effects */
  --header-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
  --header-transition: 150ms ease;
  
  /* Header Typography */
  --header-font: system-ui, -apple-system, 'Segoe UI', Roboto, Inter, sans-serif;
}

/* Accessibility: Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* ============================================
   HEADER CONTAINER
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: linear-gradient(90deg, var(--header-grad-1), var(--header-grad-2)) !important;
  color: var(--header-text) !important;
  font-family: var(--header-font);
  backdrop-filter: saturate(120%) blur(8px);
  -webkit-backdrop-filter: saturate(120%) blur(8px);
}

/* Shadow variant (apply .has-shadow class server-side if scrolled) */
.site-header.has-shadow {
  box-shadow: var(--header-shadow);
}

/* Inner container for layout */
.site-header__inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  max-width: 1600px;
  margin: 0 auto;
}

/* Right-aligned nav variant */
.site-header--right .site-header__inner {
  justify-content: flex-start;
}

.site-header--right .site-nav {
  margin-left: auto;
}

/* ============================================
   BRAND LOGO & TEXT
   ============================================ */
.site-header__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--header-text) !important;
  text-decoration: none;
  transition: opacity var(--header-transition);
  flex-shrink: 0;
}

.site-header__brand:hover {
  opacity: 0.9;
}

.site-header__brand:focus-visible {
  outline: 2px solid var(--header-accent);
  outline-offset: 4px;
  border-radius: 8px;
}

.site-header__logo {
  height: 28px;
  width: auto;
  display: block;
}

.site-header__brandtext {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.2px;
  line-height: 1;
  color: var(--header-accent) !important;
}

.site-header__by {
  color: var(--header-text-muted) !important;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.3px;
}

/* ============================================
   NAVIGATION
   ============================================ */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--header-gap);
  /* Contraint la nav à la largeur dispo du flex container (header__inner).
     min-width: 0 + flex: 1 permet à l'élément flex de devenir plus petit
     que son contenu (sinon il pousse les autres et déborde). */
  flex: 1 1 0;
  min-width: 0;
  /* overflow-x: clip permet le clip horizontal SANS clipper verticalement.
     Le panneau dropdown "Plus" est positionné en absolute mais re-parenté
     dans header__inner par /js/header-nav.js pour échapper au clip. */
  overflow-x: clip;
  overflow-y: visible;
  /* Fallback navigateurs anciens : overflow-x: hidden force overflow-y: auto.
     Sur ces navs, le panel sera affiché en position: fixed (gère JS). */
}

/* Navigation items */
.site-nav__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--header-radius);
  color: rgba(255, 255, 255, 0.75) !important;
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color var(--header-transition), 
              background-color var(--header-transition), 
              transform var(--header-transition);
  position: relative;
}

/* Hover state */
.site-nav__item:hover {
  color: #ffffff !important;
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-1px);
}

/* Focus state (accessibility) */
.site-nav__item:focus-visible {
  color: #ffffff !important;
  background: rgba(255, 255, 255, 0.06);
  outline: 2px solid var(--header-accent);
  outline-offset: 2px;
}

/* Active state */
.site-nav__item.is-active {
  color: #ffffff !important;
  background: rgba(255, 255, 255, 0.08);
}

/* Active underline indicator */
.site-nav__item.is-active::after {
  content: '';
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 6px;
  height: 2px;
  background: var(--header-accent);
  border-radius: 1px;
  transform: scaleX(0.6);
  transform-origin: center;
  transition: transform var(--header-transition);
}

/* Expand underline on hover */
.site-nav__item.is-active:hover::after {
  transform: scaleX(1);
}

/* ============================================
   ICONS
   ============================================ */
.i-home,
.i-obs,
.i-rap,
.i-ana,
.i-photo,
.i-user {
  width: var(--header-icon-size);
  height: var(--header-icon-size);
  display: inline-block;
  flex-shrink: 0;
}

/* SVG icons inside */
.site-nav__item svg,
.site-nav__item i svg {
  width: var(--header-icon-size);
  height: var(--header-icon-size);
  display: block;
  fill: currentColor;
}

/* ============================================
   RESPONSIVE - MOBILE FIRST
   ============================================ */

/* Mobile (<768px) - default styles above are mobile-first */
@media (max-width: 767px) {
  .site-header__by {
    display: none;
  }
  
  .site-header__inner {
    padding: 0 12px;
  }
  
  .site-nav {
    gap: 12px;
  }
  
  .site-nav__item {
    padding: 8px 12px;
    font-size: 0.875rem;
  }
  
  .site-header__brandtext {
    font-size: 1.1rem;
  }
  
  .site-header__logo {
    height: 24px;
  }
}

/* Tablet (768px - 1024px) */
@media (min-width: 768px) {
  .site-header__inner {
    padding: 0 24px;
  }
  
  .site-nav {
    gap: var(--header-gap);
  }
}

/* Desktop (>1024px) */
@media (min-width: 1024px) {
  .site-header__inner {
    padding: 0 32px;
  }
  
  .site-nav {
    gap: calc(var(--header-gap) + 4px);
  }
  
  .site-nav__item {
    padding: 10px 16px;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Hide text, keep icon only (mobile) */
@media (max-width: 480px) {
  .site-nav__item--icon-only span {
    display: none;
  }
  
  .site-nav__item--icon-only {
    padding: 10px;
  }
}

/* Print styles */
@media print {
  .site-header {
    position: static;
    box-shadow: none;
  }
}

/* ============================================
   NAV "PLUS ▼" DROPDOWN
   ============================================ */
.site-nav__more {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.site-nav__more-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: transparent;
  border: 0;
  color: rgba(255, 255, 255, 0.75);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--header-radius, 8px);
  white-space: nowrap;
  transition: color var(--header-transition),
              background-color var(--header-transition);
}

.site-nav__more-toggle:hover,
.site-nav__more-toggle:focus-visible {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
  outline: none;
}

.site-nav__more-toggle[aria-expanded="true"] {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.10);
}

.site-nav__more.has-active .site-nav__more-toggle {
  color: #ffffff;
}

.site-nav__more.has-active .site-nav__more-toggle::after {
  content: '';
  position: absolute;
  left: 12px;
  right: 24px;
  bottom: 6px;
  height: 2px;
  background: var(--header-accent, #ff2d8b);
  border-radius: 1px;
}

.site-nav__more-toggle svg {
  transition: transform var(--header-transition);
}

.site-nav__more-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.site-nav__more-panel {
  /* Le panel est attaché au <body> par /js/header-nav.js et positionné
     dynamiquement en position: fixed (échappe au clip de la nav). */
  position: fixed;
  min-width: 220px;
  background: var(--header-grad-2, #2a0f33);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  z-index: 9999;
}

.site-nav__more-panel[hidden] {
  display: none;
}

.site-nav__more-panel .site-nav__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.85) !important;
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  white-space: nowrap;
}

.site-nav__more-panel .site-nav__item:hover,
.site-nav__more-panel .site-nav__item:focus-visible {
  color: #ffffff !important;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  transform: none;
}

.site-nav__more-panel .site-nav__item.is-active {
  background: rgba(255, 255, 255, 0.10);
}

.site-nav__more-panel .site-nav__item.is-active::after {
  display: none; /* pas d'underline dans le dropdown */
}