/* =============================================================
   BULLSHIELD — Design System v2.0
   Fichier CSS centralisé : variables, reset, typographie,
   composants réutilisables, layout, utilitaires, responsive.
   ============================================================= */

/* ─────────────────────────────────────────────
   1. CUSTOM PROPERTIES (Design Tokens)
   ───────────────────────────────────────────── */
:root {
  /* Couleurs de fond */
  --color-bg: #0a0e1a;
  --color-bg-soft: #0f1523;
  --color-bg-card: rgba(30, 41, 59, 0.6);
  --color-bg-card-hover: rgba(40, 52, 78, 0.85);
  --color-bg-card-solid: #111827;
  --color-bg-overlay: rgba(2, 6, 23, 0.6);

  /* Couleurs principales */
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-glow: rgba(99, 102, 241, 0.4);
  --color-secondary: #8b5cf6;
  --color-accent: #34d399;
  --color-accent-glow: rgba(52, 211, 153, 0.35);

  /* Couleurs sémantiques */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #38bdf8;

  /* Texte */
  --color-text: #f8fafc;
  --color-text-muted: #9ca3af;
  --color-text-subtle: #6b7280;

  /* Bordures */
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-focus: rgba(99, 102, 241, 0.6);

  /* Typographie */
  --font-sans: "Outfit", "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-md: 1.125rem; /* 18px */
  --font-size-lg: 1.25rem; /* 20px */
  --font-size-xl: 1.5rem; /* 24px */
  --font-size-2xl: 2rem; /* 32px */
  --font-size-3xl: 2.5rem; /* 40px */
  --font-size-4xl: 3.5rem; /* 56px */

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

  --line-height-tight: 1.2;
  --line-height-normal: 1.6;
  --line-height-loose: 1.8;

  /* Espacements */
  --space-1: 0.25rem; /* 4px  */
  --space-2: 0.5rem; /* 8px  */
  --space-3: 0.75rem; /* 12px */
  --space-4: 1rem; /* 16px */
  --space-5: 1.25rem; /* 20px */
  --space-6: 1.5rem; /* 24px */
  --space-8: 2rem; /* 32px */
  --space-10: 2.5rem; /* 40px */
  --space-12: 3rem; /* 48px */
  --space-16: 4rem; /* 64px */
  --space-20: 5rem; /* 80px */

  /* Rayons de bordure */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Ombres */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-primary: 0 4px 20px var(--color-primary-glow);
  --shadow-accent: 0 4px 20px var(--color-accent-glow);

  /* Transitions */
  --ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;

  /* Layout */
  --container-max: 1200px;
  --container-width: 100%;
  --container-min-height: auto;
  --header-height: 70px;
  --sidebar-width: 280px;
}

/* Mode Light */
body.light-mode {
  --color-bg: #ffffff;
  --color-bg-soft: #f5f5f5;
  --color-bg-card: rgba(248, 248, 250, 0.8);
  --color-bg-card-hover: rgba(250, 250, 252, 0.95);
  --color-bg-card-solid: #fafbfc;
  --color-bg-overlay: rgba(255, 255, 255, 0.85);

  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-text-subtle: #9ca3af;

  --color-border: rgba(0, 0, 0, 0.1);
  --color-border-focus: rgba(99, 102, 241, 0.6);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.15);
  --shadow-primary: 0 4px 20px rgba(99, 102, 241, 0.2);
  --shadow-accent: 0 4px 20px rgba(52, 211, 153, 0.15);
}

mark {
  background-color: rgb(99, 102, 241);
  padding: 0 0.15em;
  border-radius: 2px;
}

/* ─────────────────────────────────────────────
   99. EASTER EGG / MODAL STYLES
   (copied from existing assistant_gen.css, minimal subset)
   ───────────────────────────────────────────── */
.modal {
  display: none;
  position: fixed;
  z-index: 1001;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  justify-content: center;
  align-items: center;
}
.modal.open {
  display: flex;
  animation: 0.3s ease-out fadeIn;
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
.modal-content {
  padding: 2rem;
  width: 90%;
  max-width: 500px;
  position: relative;
  animation: 0.4s cubic-bezier(0.165, 0.84, 0.44, 1) both slideUp;
  max-height: 85vh;
  overflow-y: auto;
  border-radius: 15px;
}
@keyframes slideUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}
.close-button {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
}
.heart-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

/* styles for article content inside modal */
.modal-article {
  font-size: var(--font-size-md);
  line-height: var(--line-height-loose);
  color: var(--color-text);
  word-break: break-word;
  text-align: left;
  white-space: pre-line;
  max-width: 1600px;
  margin: 0 auto;
}
.modal-article p {
  margin-bottom: var(--space-4);
}
.modal-article br {
  display: block;
  margin: var(--space-2) 0;
}
.heart-link i {
  color: var(--color-primary);
}

.easter-content {
  max-width: 420px;
  padding: var(--space-10) var(--space-8) var(--space-8);
  border-radius: var(--radius-xl);
  background: linear-gradient(
    135deg,
    var(--color-bg-card-solid) 0%,
    var(--color-bg-card) 100%
  );
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.easter-close {
  top: var(--space-4);
  right: var(--space-4);
  font-size: var(--font-size-2xl);
  color: var(--color-primary-light);
}

.easter-icon-wrap {
  margin-bottom: var(--space-4);
}

.easter-heart-beat {
  display: inline-block;
  animation: heartBeat 1.2s infinite alternate;
}

.easter-main-icon {
  font-size: clamp(2.5rem, 7vw, 3.5rem);
  color: var(--color-primary);
  filter: drop-shadow(0 0 10px var(--color-primary-glow));
}

.easter-title {
  font-size: clamp(var(--font-size-xl), 4vw, var(--font-size-2xl));
  margin-bottom: var(--space-2);
  color: var(--color-primary-light);
}

.easter-subtitle {
  font-size: var(--font-size-md);
  color: var(--color-text);
  margin-bottom: var(--space-5);
}

.easter-muted {
  opacity: 0.85;
}

.easter-love-row {
  font-size: var(--font-size-md);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.easter-emoji {
  display: inline-block;
  margin: 0 0.3em;
}

.easter-sign {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

@keyframes heartBeat {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.15);
  }
}
/* ─────────────────────────────────────────────
   2. RESET & BASE
   ───────────────────────────────────────────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  /* Font-size responsive: utiliser uniquement vw/pixels pour éviter
     les dépendances circulaires avec rem. Ceci rend les rem réellement
     fluides selon la largeur de la fenêtre. */
  font-size: clamp(14px, 1.2vw, 18px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  /* Start hidden — JS will fade in via page-ready */
  opacity: 0;
}

/* ── Page-level smooth entrance ── */
body.page-ready {
  opacity: 1;
  transition: opacity 320ms var(--ease-out);
}

/* Progressive reveal: elements slide up subtly */
.reveal-on-load {
  opacity: 0;
  transform: translateY(12px);
}

body.page-ready .reveal-on-load {
  animation: reveal-rise 400ms var(--ease-out) forwards;
  animation-delay: var(--reveal-delay, 0ms);
}

@keyframes reveal-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Card preheat: reveal inner content once media ready */
.preheat-card {
  --card-delay: 0ms;
}

.preheat-card > * {
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity 300ms var(--ease-out),
    transform 300ms var(--ease-out);
  transition-delay: var(--card-delay, 0ms);
}

.preheat-card.is-warm > * {
  opacity: 1;
  transform: translateY(0);
}

/* ── Page exit transition (navigation sortante) ── */
body.page-leaving,
body.page-ready.page-leaving {
  opacity: 0 !important;
  transform: translateY(-6px) !important;
  transition:
    opacity 180ms var(--ease-out),
    transform 180ms var(--ease-out) !important;
  pointer-events: none;
}

/* Force all children to follow the exit — no straggling buttons/icons */
body.page-leaving * {
  animation-play-state: paused !important;
  transition-delay: 0ms !important;
}

@media (prefers-reduced-motion: reduce) {
  body,
  body.page-ready,
  body.page-leaving,
  body.page-ready.page-leaving,
  .reveal-on-load,
  body.page-ready .reveal-on-load,
  .preheat-card > *,
  .preheat-card.is-warm > * {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
    animation: none !important;
  }
  body.page-leaving * {
    animation-play-state: running !important;
  }
}

a {
  color: inherit;
  text-decoration: none;
}

img,
svg {
  display: block;
  max-width: 100%;
}

button {
  cursor: pointer;
  font-family: inherit;
}

ul,
ol {
  list-style: none;
}

/* ─────────────────────────────────────────────
   3. TYPOGRAPHIE
   ───────────────────────────────────────────── */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-4xl));
}
h2 {
  font-size: clamp(var(--font-size-xl), 3vw, var(--font-size-3xl));
}
h3 {
  font-size: var(--font-size-xl);
}
h4 {
  font-size: var(--font-size-lg);
}

.text-gradient {
  background: linear-gradient(
    135deg,
    var(--color-text) 0%,
    var(--color-primary-light) 100%
  );
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-accent {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-muted {
  color: var(--color-text-muted);
}
.text-subtle {
  color: var(--color-text-subtle);
}
.text-primary-color {
  color: var(--color-primary);
}
.text-accent-color {
  color: var(--color-accent);
}

/* Icônes fluides : ajustent leur taille en fonction de la viewport
   et restent lisibles sur petits et grands écrans. */
.fa,
.fas,
.far,
.fal,
.fab {
  /* Icônes fluides : utilisent rem + vw. Avec la correction du root font-size
     ci‑dessus, les rem deviendront réellement adaptatifs. */
  font-size: clamp(0.9rem, 1.6vw, 2rem);
  line-height: 1;
  vertical-align: middle;
}

/* ─────────────────────────────────────────────
   4. LAYOUT — CONTAINER & GRILLE
   ───────────────────────────────────────────── */
.container {
  width: var(--container-width);
  max-width: var(--container-max);
  min-height: var(--container-min-height);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* Pages projet: largeur par defaut a 50% (desktop) */
body.project-page {
  --container-width: 50%;
  --container-min-height: auto;
}

/* Hub: garde la largeur complete */
body.hub-page {
  --container-width: 100%;
}

/* Securite responsive: on repasse en pleine largeur sur petits ecrans */
@media (max-width: 1024px) {
  body.project-page {
    --container-width: 100%;
  }
}

/*
  Reglages par page (exemples):
  body.page-calcul_vape { --container-width: 55%; --container-min-height: 70vh; }
  body.page-cipher_vault { --container-width: 60%; --container-min-height: 80vh; }
*/

.page-wrapper {
  flex: 1;
  padding-top: calc(var(--header-height) + var(--space-8));
  padding-bottom: var(--space-16);
}

.grid {
  display: grid;
  gap: var(--space-6);
}
.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* Responsive: augmenter la largeur max du container sur très grands écrans
   pour permettre à davantage de colonnes de s'afficher sans retour à la ligne. */
@media (min-width: 1400px) {
  :root {
    --container-max: 1400px;
  }
}

/* Pour écrans très larges, permettre encore plus d'espace */
@media (min-width: 1600px) {
  :root {
    --container-max: 1600px;
  }
}

/* Pour écrans très larges, permettre encore plus d'espace */
@media (min-width: 1800px) {
  :root {
    --container-max: 2000px;
  }
}

/* ─────────────────────────────────────────────
   5. BACKGROUND AMBIANT
   ───────────────────────────────────────────── */
.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(
      circle at 20% 50%,
      rgba(99, 102, 241, 0.07) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(139, 92, 246, 0.07) 0%,
      transparent 50%
    );
}

.particles-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ─────────────────────────────────────────────
   6. HEADER / NAVBAR
   ───────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 900;
  background: rgba(10, 14, 26, 0.8);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  box-shadow: none;
  transition: box-shadow var(--duration-normal) var(--ease-out);
}

.site-header.header-scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
  gap: var(--space-4);
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}
.header-logo img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  filter: drop-shadow(0 0 8px var(--color-primary-glow));
}
.header-logo-text {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.06em;
  color: var(--color-text);
}

/* Navigation desktop */
.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  transition:
    color var(--duration-normal) var(--ease-out),
    background var(--duration-normal) var(--ease-out);
}
.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  background: rgba(99, 102, 241, 0.12);
}
.nav-link.active {
  color: var(--color-primary-light);
}

/* Actions header (icônes sociales + eco) */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all var(--duration-normal) var(--ease-out);
}
.icon-btn:hover {
  color: var(--color-text);
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}
.icon-btn.eco-active {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(52, 211, 153, 0.1);
}

/* Sélecteur de langue */
.lang-switcher-wrap {
  display: flex;
  align-items: center;
}

/* ── Dropdown custom langue ── */
.lang-dropdown {
  position: relative;
  display: inline-block;
}
.lang-dropdown-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family:
    "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", var(--font-sans);
  font-size: var(--font-size-xs);
  padding: 0.35rem 0.5rem;
  cursor: pointer;
  outline: none;
  transition:
    border-color var(--duration-fast),
    box-shadow var(--duration-fast);
  white-space: nowrap;
}
.lang-current-flag,
.lang-flag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.lang-flag-img {
  width: 18px;
  height: 14px;
  display: block;
  border-radius: 2px;
  object-fit: cover;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08);
}
.lang-flag-fallback {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 14px;
  font-size: 0.78rem;
}
.lang-dropdown-btn:hover {
  border-color: var(--color-border-focus);
}
.lang-dropdown-btn:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}
.lang-dropdown-arrow {
  margin-left: 0.15rem;
  transition: transform var(--duration-fast);
}
.lang-dropdown.open .lang-dropdown-arrow {
  transform: rotate(180deg);
}
.lang-dropdown-list {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 100%;
  max-height: 280px;
  overflow-y: auto;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  list-style: none;
  margin: 0;
  padding: 0.25rem 0;
  z-index: 1000;
}
.lang-dropdown.open .lang-dropdown-list {
  display: block;
}
.lang-dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  font-family:
    "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", var(--font-sans);
  font-size: var(--font-size-xs);
  color: var(--color-text);
  white-space: nowrap;
  transition: background var(--duration-fast);
}
.lang-dropdown-item:hover {
  background: rgba(255, 255, 255, 0.08);
}
.lang-dropdown-item.active {
  color: var(--color-primary);
  font-weight: 600;
}

/* Bouton hamburger */
.hamburger-btn {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--color-primary);
  font-size: 1.4rem;
  transition: color var(--duration-fast);
}
.hamburger-btn:hover {
  color: var(--color-primary-light);
}

/* Responsive: afficher le hamburger et masquer la nav desktop sur petits écrans */
@media (max-width: 900px) {
  .header-nav {
    display: none;
  }
  .hamburger-btn {
    display: inline-flex;
  }
  .header-actions {
    gap: var(--space-1);
  }
  .header-logo-text {
    display: none; /* garder logo compact */
  }
  .header-inner {
    padding-inline: var(--space-4);
  }
}

/* Amélioration pour très petits écrans */
@media (max-width: 480px) {
  .mobile-drawer {
    width: 88vw;
    padding-top: calc(var(--header-height) + var(--space-4));
  }
}

/* ─────────────────────────────────────────────
   7. MENU MOBILE (Drawer)
   ───────────────────────────────────────────── */
.mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 950;
  background: var(--color-bg-overlay);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal);
  pointer-events: none;
}
.mobile-overlay.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(300px, 82vw);
  height: 100%;
  z-index: 960;
  background: rgba(10, 14, 26, 0.97);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--color-border);
  padding: 5rem var(--space-6) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease-out);
  box-shadow: -8px 0 30px rgba(0, 0, 0, 0.5);
}
.mobile-drawer.open {
  transform: translateX(0);
}

.drawer-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  transition:
    background var(--duration-fast),
    color var(--duration-fast);
}
.drawer-nav-link:hover {
  background: rgba(99, 102, 241, 0.12);
  color: var(--color-primary-light);
}

.drawer-separator {
  height: 1px;
  background: var(--color-border);
  margin-block: var(--space-2);
}

.drawer-socials {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
}
.drawer-socials .icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
}
.drawer-socials .icon-btn:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--color-border-focus);
}

.drawer-lang {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
}
.drawer-lang .lang-dropdown {
  margin-left: auto;
}

.drawer-eco {
  margin-top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: background var(--duration-fast);
  border: none;
  color: var(--color-text-muted);
  font-family: inherit;
  font-size: var(--font-size-sm);
}
.drawer-eco + .drawer-eco {
  margin-top: var(--space-2);
}
.drawer-eco-main {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.drawer-eco-main i {
  width: 1.1rem;
  text-align: center;
  font-size: 1rem;
}
.drawer-eco > i {
  font-size: 1.15rem;
}
.drawer-eco:hover {
  background: rgba(99, 102, 241, 0.1);
}
.drawer-eco.active {
  background: rgba(52, 211, 153, 0.12);
  color: var(--color-accent);
}

/* ─────────────────────────────────────────────
   8. FOOTER
   ───────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  background: rgba(8, 11, 20, 0.85);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-subtle);
  font-size: var(--font-size-sm);
  margin-top: auto;
}
.site-footer a {
  color: var(--color-primary-light);
  transition: color var(--duration-fast);
}
.site-footer a:hover {
  color: var(--color-text);
}

/* ─────────────────────────────────────────────
   9. COMPOSANTS — CARTES
   ───────────────────────────────────────────── */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  backdrop-filter: blur(12px);
  transition:
    transform var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal),
    background var(--duration-normal),
    box-shadow var(--duration-normal);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent,
    rgba(255, 255, 255, 0.03),
    transparent
  );
  transform: translateX(-100%);
  transition: transform 0.6s var(--ease-out);
}
.card:hover::before {
  transform: translateX(100%);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--shadow-primary);
}

/* GPU-accelerate cards for smoother transforms */
.card,
.project-section,
.widget {
  will-change: transform;
  backface-visibility: hidden;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: var(--space-4);
}

/* ─────────────────────────────────────────────
   10. COMPOSANTS — BOUTONS
   ───────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
}

/* petite variante pour les boutons compactes (utilisée par les partages sociaux, etc.) */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-xs);
}

/* wrapper pour les boutons de partage affichés dans les articles */
.share-buttons {
  display: flex;
  flex-wrap: wrap; /* permet de passer à la ligne sur petits écrans */
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-4);
}

/* si la zone de contenu est très étroite, réduire encore le padding */
@media (max-width: 480px) {
  .btn,
  .btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
  }
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  color: #fff;
  box-shadow:
    0 6px 24px rgba(99, 102, 241, 0.6),
    0 0 20px rgba(139, 92, 246, 0.4);
  border: 1px solid rgba(129, 140, 248, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow:
    0 12px 32px rgba(99, 102, 241, 0.8),
    0 0 28px rgba(139, 92, 246, 0.6);
  border-color: rgba(129, 140, 248, 0.6);
}

.btn-info {
  background: linear-gradient(135deg, var(--color-info) 0%, #0ea5e9 100%);
  color: #fff;
  box-shadow: 0 8px 12px rgba(56, 189, 248, 0.3);
}
.btn-info:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(56, 189, 248, 0.4);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, #10b981 100%);
  color: #fff;
  box-shadow: var(--shadow-accent);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--color-accent-glow);
}

/* --- Bouton CTA (Call-to-Action) pour articles --- */
.btn-cta {
  color: var(--color-bg);
  font-weight: var(--font-weight-semibold);
  box-shadow: 0 4px 16px rgba(52, 211, 153, 0.4);
  border: 2px solid var(--color-accent);
}
.btn-cta:hover {
  border-color: #2dd4bf;
  box-shadow: 0 8px 24px rgba(52, 211, 153, 0.6);
  transform: translateY(-2px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
}

/* ─────────────────────────────────────────────
   11. COMPOSANTS — BADGES & TAGS
   ───────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border: 1px solid transparent;
}
.badge-primary {
  background: rgba(99, 102, 241, 0.15);
  color: var(--color-primary-light);
  border-color: rgba(99, 102, 241, 0.3);
}
.badge-accent {
  background: rgba(52, 211, 153, 0.12);
  color: var(--color-accent);
  border-color: rgba(52, 211, 153, 0.25);
}
.badge-muted {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

/* ─────────────────────────────────────────────
   12. COMPOSANTS — FORMULAIRES
   ───────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
}
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--font-size-base);
  transition:
    border-color var(--duration-fast),
    box-shadow var(--duration-fast);
  outline: none;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}
.form-input::placeholder {
  color: var(--color-text-subtle);
}
.form-select option {
  background: var(--color-bg-soft);
}
.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* ─────────────────────────────────────────────
   13. COMPOSANTS — PAGE HERO
   ───────────────────────────────────────────── */
.page-hero {
  text-align: center;
  padding: var(--space-16) 0 var(--space-12);
}
.page-hero h1 {
  margin-bottom: var(--space-4);
  margin-top: -70px;
}
.page-hero .subtitle {
  color: var(--color-text-muted);
  font-size: var(--font-size-md);
  max-width: 1000px;
  margin-inline: auto;
  line-height: var(--line-height-loose);
}

/* ─────────────────────────────────────────────
   14. COMPOSANTS — SECTION TITLE
   ───────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.section-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}
.section-line {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ─────────────────────────────────────────────
   15. COMPOSANTS — BACK BUTTON
   ───────────────────────────────────────────── */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  transition: all var(--duration-normal) var(--ease-out);
  text-decoration: none;
  margin-bottom: var(--space-8);
}
.back-btn:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
  background: rgba(99, 102, 241, 0.1);
  transform: translateX(-4px);
}

/* ─────────────────────────────────────────────
   16. MODE ÉCO & MODE LIGHT
   ───────────────────────────────────────────── */
body.eco-mode .ambient-bg,
body.eco-mode .particles-canvas {
  display: none;
}
body.eco-mode .card,
body.eco-mode .site-header,
body.eco-mode .mobile-drawer {
  backdrop-filter: none;
  background: var(--color-bg-card-solid);
}
body.eco-mode * {
  animation-duration: 0s !important;
  transition-duration: 50ms !important;
}

/* Mode Light - Ajustements supplémentaires */
body.light-mode .ambient-bg {
  background:
    radial-gradient(
      circle at 20% 50%,
      rgba(99, 102, 241, 0.04) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(139, 92, 246, 0.04) 0%,
      transparent 50%
    );
}

body.light-mode .site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

body.light-mode .site-footer {
  background: rgba(250, 250, 252, 0.95);
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  color: #6b7280;
}
body.light-mode .site-footer a {
  color: #6366f1;
}

body.light-mode .mobile-drawer {
  background: rgba(255, 255, 255, 0.98);
  border-left: 1px solid rgba(0, 0, 0, 0.08);
}

body.light-mode .mobile-overlay {
  background: rgba(0, 0, 0, 0.25);
}

body.light-mode .card {
  background: rgba(248, 248, 250, 0.9);
  border-color: rgba(0, 0, 0, 0.08);
}
body.light-mode .card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  background: rgba(250, 250, 252, 0.95);
}

body.light-mode .nav-link {
  color: #6b7280;
}
body.light-mode .nav-link:hover,
body.light-mode .nav-link.active {
  color: #1f2937;
  background: rgba(99, 102, 241, 0.1);
}

body.light-mode .icon-btn {
  background: rgba(0, 0, 0, 0.05);
  border: 1px solid rgba(0, 0, 0, 0.1);
  color: #6b7280;
}
body.light-mode .icon-btn:hover {
  color: #1f2937;
  background: rgba(99, 102, 241, 0.1);
  border-color: #6366f1;
}
body.light-mode .icon-btn.theme-light {
  color: #6366f1;
  border-color: #6366f1;
  background: rgba(99, 102, 241, 0.1);
}

body.light-mode .btn-ghost {
  background: rgba(0, 0, 0, 0.05);
  color: #1f2937;
  border: 1px solid rgba(0, 0, 0, 0.1);
}
body.light-mode .btn-ghost:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: #6366f1;
}

body.light-mode .form-input,
body.light-mode .form-select,
body.light-mode .form-textarea {
  background: rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.1);
  color: #1f2937;
}
body.light-mode .form-input:focus,
body.light-mode .form-select:focus,
body.light-mode .form-textarea:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}
body.light-mode .form-input::placeholder {
  color: #9ca3af;
}

body.light-mode .drawer-nav-link {
  color: #1f2937;
}
body.light-mode .drawer-nav-link:hover {
  background: rgba(99, 102, 241, 0.1);
  color: #6366f1;
}

body.light-mode .drawer-eco,
body.light-mode .drawer-separator {
  background: rgba(0, 0, 0, 0.05);
  border: none;
  color: #6b7280;
}
body.light-mode .drawer-eco.active {
  background: rgba(52, 211, 153, 0.12);
  color: #10b981;
}

body.light-mode .modal {
  background-color: rgba(0, 0, 0, 0.45);
}

body.light-mode .modal-content {
  background: rgba(255, 255, 255, 0.98);
  color: #1f2937;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

body.light-mode .close-button {
  color: #6b7280;
}
body.light-mode .close-button:hover {
  color: #1f2937;
}

/* ─────────────────────────────────────────────
   BLOG ARTICLE — DESIGN PREMIUM
   Styles centralisés pour toutes les pages
   d'articles du blog. Supprime le besoin de
   <style> inline dans chaque fichier HTML.
   ───────────────────────────────────────────── */

/* --- Barre de progression de lecture --- */
.reading-progress {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-secondary),
    var(--color-accent)
  );
  z-index: 899;
  transition: width 60ms linear;
  border-radius: 0 2px 2px 0;
  box-shadow: 0 0 8px var(--color-primary-glow);
}

/* --- Navigation retour --- */
.article-back-nav {
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

/* --- Header d'article hero --- */
.article-header {
  position: relative;
  padding: var(--space-12) 0 var(--space-8);
  text-align: center;
}
.article-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      ellipse at 30% 0%,
      rgba(99, 102, 241, 0.08) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse at 70% 100%,
      rgba(139, 92, 246, 0.06) 0%,
      transparent 50%
    );
  border-radius: var(--radius-xl);
  pointer-events: none;
}

/* Badge catégorie */
.article-category {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-primary-light);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  margin-bottom: var(--space-4);
}
.article-category i {
  font-size: 0.7rem;
}

/* Titre d'article */
.article-title {
  font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  line-height: 1.15;
  margin: var(--space-4) auto var(--space-5);
  max-width: 900px;
}

/* Méta-données (date, temps de lecture) */
.article-meta-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}
.article-meta-bar span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.article-meta-bar .meta-separator {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-text-subtle);
}

/* --- Image mise en avant --- */
.article-hero-image {
  position: relative;
  margin: var(--space-8) auto;
  max-width: 800px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow:
    0 25px 50px rgba(0, 0, 0, 0.25),
    0 0 0 1px rgba(255, 255, 255, 0.05);
}
.article-hero-image img {
  width: 100%;
  display: block;
  transition: transform var(--duration-slow) var(--ease-out);
}
.article-hero-image:hover img {
  transform: scale(1.02);
}
.article-hero-image::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

/* --- Contenu article --- */
.article-content {
  line-height: var(--line-height-loose);
  font-size: var(--font-size-md);
  max-width: 760px;
  margin: 0 auto;
  color: var(--color-text);
}
.article-content p {
  margin-bottom: var(--space-6);
}
.article-content h2 {
  margin-top: var(--space-12);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid rgba(99, 102, 241, 0.2);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  position: relative;
}
.article-content h2::before {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-secondary)
  );
  border-radius: 2px;
}
.article-content h3 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  font-size: var(--font-size-lg);
  color: var(--color-text);
}
.article-content ul,
.article-content ol {
  margin: var(--space-5) 0;
  padding-left: var(--space-6);
}
.article-content ul {
  list-style: none;
}
.article-content ul li {
  position: relative;
  padding-left: var(--space-5);
  margin-bottom: var(--space-3);
}
.article-content ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-secondary)
  );
  box-shadow: 0 0 6px var(--color-primary-glow);
}
.article-content ol {
  list-style: decimal;
}
.article-content ol li {
  margin-bottom: var(--space-3);
}
.article-content strong {
  color: var(--color-text);
  font-weight: var(--font-weight-semibold);
}
.article-content a {
  color: var(--color-primary-light);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--duration-fast);
}
.article-content a:hover {
  color: var(--color-accent);
}

/* --- Dropcap --- */
.dropcap {
  float: left;
  font-size: 4.2rem;
  line-height: 0.85;
  font-weight: var(--font-weight-bold);
  margin-right: 14px;
  margin-top: 6px;
  font-family: var(--font-sans);
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-secondary)
  );
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 8px var(--color-primary-glow));
}

/* --- Highlight Box (citation / info clé) --- */
.highlight-box {
  position: relative;
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.06) 0%,
    rgba(139, 92, 246, 0.04) 100%
  );
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-6) var(--space-6) var(--space-6) var(--space-8);
  border-radius: var(--radius-md);
  margin: var(--space-8) 0;
  overflow: hidden;
}
.highlight-box::before {
  content: "\f10d"; /* fa-quote-left */
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  top: var(--space-4);
  left: var(--space-2);
  font-size: 1.2rem;
  color: var(--color-primary);
  opacity: 0.3;
}
.highlight-box p {
  font-style: italic;
  font-size: var(--font-size-md);
  color: var(--color-text);
  margin: 0;
  line-height: var(--line-height-loose);
}
.highlight-box h3 {
  margin-top: 0;
  margin-bottom: var(--space-3);
  font-size: var(--font-size-lg);
  color: var(--color-primary-light);
}

/* --- Grille de feature cards --- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-5);
  margin: var(--space-8) 0;
}

/* --- Feature Card (glassmorphism) --- */
.feature-card {
  position: relative;
  padding: var(--space-6);
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  transition:
    transform var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal),
    box-shadow var(--duration-normal);
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-secondary),
    var(--color-accent)
  );
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}
.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.2),
    0 0 0 1px rgba(99, 102, 241, 0.1);
}
.feature-card:hover::before {
  opacity: 1;
}
.feature-card .card-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  transition: background var(--duration-normal);
}
.feature-card:hover .card-icon-wrapper {
  background: rgba(99, 102, 241, 0.2);
}
.feature-card .card-icon-wrapper i {
  font-size: 1.2rem;
  color: var(--color-primary-light);
}
/* Fallback : icône directe sans wrapper */
.feature-card > i {
  color: var(--color-primary-light);
  margin-bottom: var(--space-4);
  font-size: 1.6rem;
  display: block;
  filter: drop-shadow(0 2px 6px var(--color-primary-glow));
}
.feature-card h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}
.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-normal);
  margin: 0;
}

/* --- CTA button dans article (ex: calculateur) --- */
.article-cta {
  text-align: center;
  margin: var(--space-6) 0 var(--space-4);
}

/* --- Séparateur visuel décoratif --- */
.article-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin: var(--space-10) 0;
  color: var(--color-text-subtle);
}
.article-divider::before,
.article-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-border),
    transparent
  );
}
.article-divider i {
  font-size: 0.8rem;
  opacity: 0.5;
}

/* --- Footer de partage --- */
.article-share-footer {
  margin: var(--space-12) 0 var(--space-8);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.06) 0%,
    rgba(139, 92, 246, 0.04) 100%
  );
  border: 1px solid rgba(99, 102, 241, 0.12);
  text-align: center;
}
.article-share-footer h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}
.article-share-footer > p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

/* Boutons de partage sociaux colorés */
.share-buttons-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: all var(--duration-normal) var(--ease-out);
  color: #fff;
}
.share-btn:hover {
  transform: translateY(-3px);
  filter: brightness(1.15);
}
.share-btn i {
  font-size: 0.9rem;
}
.share-btn-twitter {
  background: linear-gradient(135deg, #1da1f2, #0d8bd9);
  box-shadow: 0 4px 15px rgba(29, 161, 242, 0.3);
}
.share-btn-linkedin {
  background: linear-gradient(135deg, #0077b5, #005e93);
  box-shadow: 0 4px 15px rgba(0, 119, 181, 0.3);
}
.share-btn-facebook {
  background: linear-gradient(135deg, #1877f2, #0d65d9);
  box-shadow: 0 4px 15px rgba(24, 119, 242, 0.3);
}
.share-btn-telegram {
  background: linear-gradient(135deg, #0088cc, #006da6);
  box-shadow: 0 4px 15px rgba(0, 136, 204, 0.3);
}
.share-btn-instagram {
  background: linear-gradient(
    135deg,
    #f09433,
    #e6683c,
    #dc2743,
    #cc2366,
    #bc1888
  );
  box-shadow: 0 4px 15px rgba(225, 48, 108, 0.3);
}

/* --- Bouton "retour en haut" --- */
.scroll-top-btn {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-secondary)
  );
  color: #fff;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-primary);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 800;
  pointer-events: none;
}
.scroll-top-btn.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.scroll-top-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--color-primary-glow);
}

/* --- LIGHT MODE — overrides articles --- */
body.light-mode .article-header::before {
  background:
    radial-gradient(
      ellipse at 30% 0%,
      rgba(99, 102, 241, 0.06) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse at 70% 100%,
      rgba(139, 92, 246, 0.04) 0%,
      transparent 50%
    );
}
body.light-mode .article-category {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.2);
}
body.light-mode .article-hero-image {
  box-shadow:
    0 25px 50px rgba(0, 0, 0, 0.1),
    0 0 0 1px rgba(0, 0, 0, 0.05);
}
body.light-mode .feature-card {
  background: rgba(255, 255, 255, 0.7);
  border-color: rgba(0, 0, 0, 0.08);
}
body.light-mode .feature-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}
body.light-mode .highlight-box {
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.04) 0%,
    rgba(139, 92, 246, 0.02) 100%
  );
  border-color: rgba(99, 102, 241, 0.1);
}
body.light-mode .article-share-footer {
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.04) 0%,
    rgba(139, 92, 246, 0.02) 100%
  );
  border-color: rgba(99, 102, 241, 0.08);
}

/* --- Responsive articles --- */
@media (max-width: 768px) {
  .article-header {
    padding: var(--space-8) 0 var(--space-6);
  }
  .article-content {
    font-size: var(--font-size-base);
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .article-share-footer {
    padding: var(--space-6);
    margin: var(--space-8) 0 var(--space-4);
  }
  .share-btn {
    padding: var(--space-2) var(--space-4);
    font-size: 0.7rem;
  }
  .reading-progress {
    height: 2px;
  }
}

@media (max-width: 480px) {
  .article-title {
    font-size: 1.5rem;
  }
  .dropcap {
    font-size: 3rem;
  }
  .article-share-footer {
    padding: var(--space-5);
  }
}

/* ─────────────────────────────────────────────
   17. UTILITAIRES
   ───────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-2 {
  gap: var(--space-2);
}
.gap-4 {
  gap: var(--space-4);
}
.gap-6 {
  gap: var(--space-6);
}
.mt-auto {
  margin-top: auto;
}
.w-full {
  width: 100%;
}
.text-center {
  text-align: center;
}

/* ─────────────────────────────────────────────
   18. RESPONSIVE
   ───────────────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-nav {
    display: none;
  }

  /* Garder le conteneur d'actions visible pour afficher le hamburger,
     masquer uniquement les icônes sociales et le bouton éco. */
  .header-actions {
    display: flex;
    gap: var(--space-1);
    align-items: center;
  }
  .header-actions .icon-btn {
    display: none;
  }
  #ecoToggleBtn {
    display: none;
  }

  .hamburger-btn {
    display: flex;
  }

  .container {
    padding-inline: var(--space-4);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .page-hero {
    padding: var(--space-10) 0 var(--space-8);
  }
}

@media (min-width: 769px) {
  .hamburger-btn {
    display: none;
  }
  .mobile-drawer {
    display: none !important;
  }
  .mobile-overlay {
    display: none !important;
  }
}