/* ==========================================
   DESIGN SYSTEM – CSS PUR (100% VALIDE)
   ========================================== */

/* ==========================================
   1. DESIGN TOKENS (Variables CSS)
   ========================================== */

:root {
  /* Primary Marque */
  --color-primary: #1B5BB8;          /* Bleu marque */
  --color-primary-dark: #0d3a72;     /* Hover */
  --color-primary-light: #e6f0ff;    /* Light bg */

  /* Secondary + Accent */
  --color-secondary: #28A745;        /* Vert écologie */
  --color-accent: #FF9500;           /* Orange (rare) */

  /* Neutrals */
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-lighter: #999999;

  --color-bg: #ffffff;
  --color-bg-light: #fafafa;
  --color-bg-lighter: #f0f0f0;

  --color-border: #e0e0e0;

  /* States */
  --color-error: #dc3545;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-info: #17a2b8;

  /* Spacing Scale (4px unit) */
  --spacing-unit: 4px;
  --spacing-xs: 4px;       /* 1 unit */
  --spacing-sm: 8px;       /* 2 units */
  --spacing-md: 16px;      /* 4 units */
  --spacing-lg: 24px;      /* 6 units */
  --spacing-xl: 32px;      /* 8 units */
  --spacing-2xl: 48px;     /* 12 units */
  --spacing-3xl: 64px;     /* 16 units */

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;

  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  --font-size-3xl: 36px;
  --font-size-4xl: 48px;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Layout */
  --container-max-width: 1200px;
  --container-padding-mobile: 16px;
  --container-padding-tablet: 32px;
  --container-padding-desktop: 64px;

  --grid-gap: 24px;
  --grid-gap-sm: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ==========================================
   2. RESET + BASE STYLES
   ========================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: all var(--transition-base);
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  font-weight: var(--font-weight-bold);
}

h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

p {
  margin-bottom: var(--spacing-md);
}

/* ==========================================
   3. LAYOUT COMPOSANTS
   ========================================== */

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding-mobile);
}

@media (min-width: 600px) {
  .container {
    padding: 0 var(--container-padding-tablet);
  }
}

@media (min-width: 900px) {
  .container {
    padding: 0 var(--container-padding-desktop);
  }
}

.section {
  padding: var(--spacing-2xl) 0;
}

@media (min-width: 600px) {
  .section {
    padding: var(--spacing-3xl) 0;
  }
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
}

@media (min-width: 600px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* ==========================================
   4. NAVIGATION
   ========================================== */

.header {
  position: sticky;
  top: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  padding: var(--spacing-md) 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
}

.nav-brand:hover {
  color: var(--color-primary-dark);
}

.nav-menu {
  display: none;
  list-style: none;
}

@media (min-width: 900px) {
  .nav-menu {
    display: flex;
    gap: var(--spacing-md);
  }
}

.nav-menu.active {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: white;
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md);
  gap: var(--spacing-md);
}

@media (min-width: 900px) {
  .nav-menu.active {
    position: static;
    flex-direction: row;
    background: transparent;
    border: none;
    padding: 0;
  }
}

.nav-toggle {
  display: block;
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }
}

.menu-btn {
  min-height: 44px;
  min-width: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  font-size: 24px;
}

.menu-btn:hover {
  opacity: 0.7;
}

.menu-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 16px;
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  transition: all var(--transition-base);
}

.nav__link:hover {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.nav__link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ==========================================
   5. BUTTONS
   ========================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px var(--spacing-md);
  border-radius: var(--radius-md);
  border: none;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  text-align: center;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
}

.btn--primary:hover {
  background: var(--color-primary-dark);
}

.btn--primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn--ghost:hover {
  background: var(--color-primary-light);
}

.btn--sm {
  min-height: 40px;
  padding: 10px var(--spacing-sm);
}

.btn--lg {
  min-height: 48px;
  padding: 14px var(--spacing-lg);
}

/* ==========================================
   6. CARDS
   ========================================== */

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
}

.card--hover:hover {
  box-shadow: var(--shadow-md);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.card__meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.card__content {
  margin-top: var(--spacing-md);
}

/* ==========================================
   7. FORMS
   ========================================== */

.form-row {
  margin-bottom: var(--spacing-lg);
}

.label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.input,
.textarea,
.select {
  width: 100%;
  min-height: 44px;
  padding: 10px var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  transition: border-color var(--transition-base);
}

.input:focus-visible,
.textarea:focus-visible,
.select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.textarea {
  resize: vertical;
  min-height: 120px;
}

.form-help {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.form-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

/* ==========================================
   8. HERO
   ========================================== */

.hero {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg-light);
  text-align: center;
}

.hero__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
}

@media (min-width: 600px) {
  .hero__title {
    font-size: var(--font-size-4xl);
  }
}

.hero__lead {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
  line-height: var(--line-height-relaxed);
}

.hero__cta {
  margin-top: var(--spacing-lg);
}

/* ==========================================
   9. FOOTER
   ========================================== */

.footer {
  background: var(--color-bg-lighter);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  color: var(--color-text);
}

.footer__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

@media (min-width: 600px) {
  .footer__content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .footer__content {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer__section {
  margin-bottom: var(--spacing-xl);
}

.footer__section h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.footer__section ul {
  list-style: none;
  padding: 0;
}

.footer__section li {
  margin-bottom: var(--spacing-sm);
}

.footer__section a {
  color: var(--color-primary);
  text-decoration: none;
}

.footer__section a:hover {
  text-decoration: underline;
}

.nap-block {
  margin-bottom: var(--spacing-lg);
}

.nap-block p {
  margin: 0 0 var(--spacing-xs) 0;
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-top: var(--spacing-2xl);
}

/* ==========================================
   10. ACCESSIBILITY
   ========================================== */

.sr-only,
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 100;
  text-decoration: none;
  border-radius: var(--radius-md);
}

.skip-link:focus-visible {
  top: 0;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

/* ==========================================
   11. UTILITIES
   ========================================== */

.text-muted {
  color: var(--color-text-light);
}

.text-error {
  color: var(--color-error);
}

.text-success {
  color: var(--color-success);
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-left {
  text-align: left;
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.p-md {
  padding: var(--spacing-md);
}

.p-lg {
  padding: var(--spacing-lg);
}

.list-reset {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* ==========================================
   12. LIST & BREADCRUMBS
   ========================================== */

.breadcrumbs {
  display: flex;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-lg);
}

.breadcrumbs a {
  color: var(--color-primary);
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

/* ==========================================
   13. ALERT MESSAGES
   ========================================== */

.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-info);
  background: var(--color-bg-light);
  margin-bottom: var(--spacing-lg);
}

.alert--success {
  border-left-color: var(--color-success);
}

.alert--error {
  border-left-color: var(--color-error);
}

.alert--warning {
  border-left-color: var(--color-warning);
}

/* ==========================================
   14. RESPONSIVE TABLE
   ========================================== */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
}

th {
  background: var(--color-bg-light);
  padding: var(--spacing-md);
  text-align: left;
  font-weight: var(--font-weight-bold);
  border-bottom: 1px solid var(--color-border);
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

/* ==========================================
   END OF DESIGN SYSTEM CSS
   ========================================== */

/* ==========================================
   HEADER FIX - Navbar Compact + <details> support
   ========================================== */

/* Base: Hide nav menu by default */
.nav-menu-toggle {
  all: unset;
  display: block;
}

.nav-menu-toggle[open] .nav-menu {
  display: flex;
}

.menu-btn {
  min-height: 44px;
  min-width: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  font-size: 24px;
}

.menu-btn:hover {
  opacity: 0.7;
}

.menu-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Desktop: Nav en ligne, compact */
@media (min-width: 768px) {
  .header {
    padding: var(--spacing-sm) 0; /* Réduit de var(--spacing-md) */
  }

  .header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
  }

  .nav-menu-toggle {
    display: block !important; /* Toujours visible, mais pas comme toggle */
    all: auto;
  }

  .nav-menu-toggle[open],
  .nav-menu-toggle summary {
    display: none !important; /* Cache le toggle en desktop */
  }

  .nav-menu {
    display: flex !important;
    flex-direction: row;
    gap: var(--spacing-sm); /* Réduit de var(--spacing-md) */
    position: static;
    background: transparent;
    border: none;
    padding: 0;
  }

  .nav__link {
    padding: 8px 12px; /* Réduit de 12px 16px */
    min-height: auto; /* Enlève le min-height */
  }
}

/* Mobile: Nav empilée, compact */
@media (max-width: 767px) {
  .header {
    padding: var(--spacing-sm) 0;
  }

  .nav-menu-toggle {
    display: block;
    margin-left: auto;
  }

  .nav-menu-toggle[open] {
    position: static;
  }

  .nav-menu-toggle[open] .nav-menu {
    display: flex !important;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
    z-index: 99;
  }

  .nav-menu-toggle[open] .nav-menu {
    display: flex;
  }

  .nav__link {
    padding: 8px 12px;
    min-height: 40px;
  }
}

/* ==========================================
   NATIONAL SITES CARDS SECTION
   ========================================== */

.national-sites {
  background: var(--color-bg-light);
  padding: var(--spacing-2xl) 0;
}

.national-sites h2 {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  font-size: var(--font-size-2xl);
  color: var(--color-primary);
}

.national-sites .card {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  min-height: 280px;
}

.national-sites .card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.national-sites .card__title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.national-sites .card p {
  flex-grow: 1;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

/* ==========================================