/* ===== Thème classique (par défaut) — surcharge des variables Bootstrap ===== */
:root,
[data-app-theme="classic"] {
  --bs-body-bg: #0f1216;
  --bs-body-color: #e6e9ef;
  --bs-border-color: #2a2f37;
  --bs-secondary-bg: #171b21;
  --bs-tertiary-bg: #1c2129;

  --bs-primary: #5b8cff;
  --bs-primary-rgb: 91, 140, 255;
  --bs-link-color: #5b8cff;
  --bs-link-hover-color: #85a8ff;

  --bs-list-group-bg: #171b21;
  --bs-list-group-color: #c2c9d6;
  --bs-list-group-border-color: #2a2f37;
  --bs-list-group-action-hover-bg: rgba(255, 255, 255, 0.06);
  --bs-list-group-active-bg: var(--bs-primary);
  --bs-list-group-active-border-color: var(--bs-primary);
  --bs-list-group-active-color: #fff;

  --bs-table-bg: #171b21;
  --bs-table-color: #e6e9ef;
  --bs-table-striped-bg: #1c2129;
  --bs-table-hover-bg: #20262f;
  --bs-table-border-color: #2a2f37;

  --sidebar-bg: #0b0e12;
  --radius: 10px;
  --font-heading: inherit;
  --font-body: inherit;
}

/* ===== Thème "IA Futur" — rouge clair + cyan, sombre, inspiré tech/IA ===== */
[data-app-theme="futur"] {
  --bs-body-bg: #150e0e;
  --bs-body-color: #f5e8e8;
  --bs-border-color: #3a2424;
  --bs-secondary-bg: #201414;
  --bs-tertiary-bg: #2a1a1a;

  --bs-primary: #ef4444;
  --bs-primary-rgb: 239, 68, 68;
  --bs-link-color: #fca5a5;
  --bs-link-hover-color: #fecaca;

  --bs-list-group-bg: #201414;
  --bs-list-group-color: #f5d0d0;
  --bs-list-group-border-color: #3a2424;
  --bs-list-group-action-hover-bg: rgba(239, 68, 68, 0.16);
  --bs-list-group-active-bg: var(--bs-primary);
  --bs-list-group-active-border-color: var(--bs-primary);
  --bs-list-group-active-color: #fff;

  --bs-table-bg: #201414;
  --bs-table-color: #f5e8e8;
  --bs-table-striped-bg: #2a1a1a;
  --bs-table-hover-bg: rgba(239, 68, 68, 0.12);
  --bs-table-border-color: #3a2424;

  --sidebar-bg: #100a0a;
  --glow-color: rgba(239, 68, 68, 0.35);
  --accent-2: #22d3ee;
  --bg-glow-1: rgba(239, 68, 68, 0.35);
  --bg-glow-2: rgba(34, 211, 238, 0.10);
  --heading-color: #f5e8e8;
  --title-grad-1: #f5e8e8;
  --title-grad-2: var(--accent-2);
  --title-grad-3: var(--bs-primary);
  --radius: 14px;
  --font-heading: "Orbitron", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;
}

/* ===== Thème "IA Futur" — variante claire (même rouge/cyan, fond clair) ===== */
[data-app-theme="futur-light"] {
  --bs-body-bg: #fdf5f5;
  --bs-body-color: #3a1e1e;
  --bs-border-color: #f3dede;
  --bs-secondary-bg: #ffffff;
  --bs-tertiary-bg: #fceded;

  --bs-primary: #ef4444;
  --bs-primary-rgb: 239, 68, 68;
  --bs-link-color: #dc2626;
  --bs-link-hover-color: #b91c1c;

  --bs-list-group-bg: #ffffff;
  --bs-list-group-color: #3a1e1e;
  --bs-list-group-border-color: #f3dede;
  --bs-list-group-action-hover-bg: rgba(239, 68, 68, 0.07);
  --bs-list-group-active-bg: var(--bs-primary);
  --bs-list-group-active-border-color: var(--bs-primary);
  --bs-list-group-active-color: #fff;

  --bs-table-bg: #ffffff;
  --bs-table-color: #3a1e1e;
  --bs-table-striped-bg: #fdf2f2;
  --bs-table-hover-bg: rgba(239, 68, 68, 0.05);
  --bs-table-border-color: #f3dede;

  --sidebar-bg: #ffffff;
  --glow-color: rgba(239, 68, 68, 0.14);
  --accent-2: #0891b2;
  --bg-glow-1: rgba(239, 68, 68, 0.06);
  --bg-glow-2: rgba(8, 145, 178, 0.08);
  --heading-color: #3a1e1e;
  --title-grad-1: var(--bs-primary);
  --title-grad-2: var(--accent-2);
  --title-grad-3: #b91c1c;
  --radius: 14px;
  --font-heading: "Orbitron", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font-body, "Segoe UI", Roboto, Helvetica, Arial, sans-serif);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background 0.25s, color 0.25s;
}

[data-app-theme^="futur"] body {
  background:
    radial-gradient(60rem 30rem at 100% -10%, var(--bg-glow-1), transparent 60%),
    radial-gradient(40rem 24rem at -10% 40%, var(--bg-glow-2), transparent 60%),
    var(--bs-body-bg);
}

/* ----- Écran de chargement initial ----- */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bs-body-bg);
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.page-loader.page-loader-hide {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.loader-logo {
  font-size: 2.75rem;
  animation: loaderPulse 1.4s ease-in-out infinite;
}

.loader-text {
  font-family: var(--font-heading, inherit);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--bs-body-color);
  opacity: 0.8;
}

.loader-bar {
  width: 180px;
  height: 4px;
  border-radius: 999px;
  background: rgba(127, 127, 127, 0.25);
  overflow: hidden;
}

.loader-bar-fill {
  height: 100%;
  width: 40%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--bs-primary), var(--accent-2, var(--bs-primary)));
  animation: loaderSlide 1.1s ease-in-out infinite;
}

@keyframes loaderPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}

@keyframes loaderSlide {
  0% { transform: translateX(-120%); }
  100% { transform: translateX(350%); }
}

/* ----- Transition de contenu (changement de langue / vue / thème) ----- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.content.fade-in-effect {
  animation: fadeInUp 0.35s ease both;
}

.spinner-border { color: var(--bs-primary); }

/* ----- Topbar ----- */
.topbar {
  background: var(--bs-secondary-bg);
  border-bottom: 1px solid var(--bs-border-color);
  position: sticky;
  top: 0;
  z-index: 10;
  transition: background 0.25s, border-color 0.25s;
}

.topbar-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--bs-body-color);
  letter-spacing: 0.02em;
}

[data-app-theme^="futur"] .topbar-title {
  background: linear-gradient(90deg, var(--title-grad-1), var(--title-grad-2) 60%, var(--title-grad-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-transform: uppercase;
}

.lang-switcher, .theme-switcher { gap: 0.9rem; }

/* Menu du haut : simples liens, la page/langue/thème actif est souligné. */
.lang-btn, .theme-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: transparent;
  border: none;
  padding: 0.2rem 0.05rem;
  color: var(--bs-body-color);
  text-decoration: none;
  white-space: nowrap;
  font-size: 0.92rem;
  cursor: pointer;
  transition: color 0.15s ease;
}

.lang-btn:hover, .theme-btn:hover {
  color: var(--bs-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.lang-btn.active, .theme-btn.active {
  color: var(--bs-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Bootstrap compile les couleurs de .btn-primary en valeurs figées (pas de var(--bs-primary)) :
   on les relie ici explicitement à notre variable de thème (utilisé par le quiz). */
.btn-primary {
  --bs-btn-bg: var(--bs-primary);
  --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: color-mix(in srgb, var(--bs-primary) 85%, white);
  --bs-btn-hover-border-color: color-mix(in srgb, var(--bs-primary) 80%, white);
  --bs-btn-active-bg: color-mix(in srgb, var(--bs-primary) 80%, black);
  --bs-btn-active-border-color: color-mix(in srgb, var(--bs-primary) 75%, black);
  --bs-btn-disabled-bg: var(--bs-primary);
  --bs-btn-disabled-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}

[data-app-theme^="futur"] .btn-primary {
  box-shadow: 0 0 16px var(--glow-color);
}

[data-app-theme="futur-light"] .btn-outline-light {
  --bs-btn-color: var(--bs-body-color);
  --bs-btn-border-color: var(--bs-border-color);
  --bs-btn-hover-color: #fff;
  --bs-btn-hover-bg: var(--bs-primary);
  --bs-btn-hover-border-color: var(--bs-primary);
}

/* ----- Layout ----- */
.layout {
  display: flex;
  flex: 1;
  min-height: 0;
}

.sidebar {
  width: 230px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--bs-border-color);
  transition: background 0.25s, border-color 0.25s;
}

/* Bootstrap fige --bs-list-group-active-bg sur .list-group lui-même : on la relie à --bs-primary. */
.list-group {
  --bs-list-group-active-bg: var(--bs-primary);
  --bs-list-group-active-border-color: var(--bs-primary);
}

.menu-item {
  font-size: 0.95rem;
  border-radius: var(--radius) !important;
  margin-bottom: 0.3rem;
  border-width: 1px;
  transition: background-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 14px var(--glow-color); }
  50% { box-shadow: 0 0 24px var(--glow-color); }
}

[data-app-theme^="futur"] .menu-item.active {
  animation: glowPulse 2.4s ease-in-out infinite;
}

.content {
  flex: 1;
  padding: 1.5rem;
  overflow-x: auto;
}

.loading { color: var(--bs-secondary-color, #9aa4b2); }

.section-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin: 1.5rem 0 0.75rem;
}

.section-title:first-child { margin-top: 0; }

[data-app-theme^="futur"] .section-title {
  color: var(--heading-color);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-left: 4px solid var(--bs-primary);
  padding-left: 0.6rem;
}

.section-note {
  color: var(--bs-secondary-color, #9aa4b2);
  font-size: 0.9rem;
  margin: -0.25rem 0 0.75rem;
}

/* ----- Tables ----- */
.table-wrapper {
  background: var(--bs-secondary-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  overflow: hidden;
  transition: background 0.25s, border-color 0.25s, box-shadow 0.25s;
}

[data-app-theme^="futur"] .table-wrapper {
  box-shadow: 0 0 22px var(--glow-color);
}

table { font-size: 0.92rem; margin-bottom: 0; }

tbody tr { transition: background-color 0.1s ease; }

caption {
  caption-side: top;
  text-align: left;
  font-weight: 600;
  padding: 0.75rem 1rem 0.25rem;
  font-family: var(--font-heading);
}

th, td { white-space: nowrap; }

/* ----- Recherche ----- */
.search-bar .form-control {
  max-width: 420px;
}

/* ----- Prononciation ----- */
.speak-btn {
  background: transparent;
  border: 1px solid var(--bs-border-color);
  border-radius: 999px;
  width: 1.9rem;
  height: 1.9rem;
  flex-shrink: 0;
  line-height: 1;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.speak-btn:hover {
  border-color: var(--bs-primary);
  background: var(--bs-tertiary-bg);
  transform: scale(1.08);
}

/* ----- Quiz ----- */
.quiz-score {
  font-weight: 600;
}

.quiz-card {
  max-width: 640px;
  border-radius: var(--radius);
}

.quiz-front {
  font-size: 1.4rem;
  font-weight: 600;
}

.quiz-back {
  font-size: 1.15rem;
  color: var(--bs-primary);
}

/* ----- Footer ----- */
.footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.8rem;
  color: var(--bs-secondary-color, #9aa4b2);
  border-top: 1px solid var(--bs-border-color);
}

@media (max-width: 720px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--bs-border-color); }
  .sidebar .list-group { flex-direction: row; flex-wrap: wrap; }
  .menu-item { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  .loader-logo, .loader-bar-fill, .content.fade-in-effect, .menu-item.active {
    animation: none !important;
  }
  .lang-btn, .theme-btn, .menu-item, .btn-primary {
    transition: none !important;
  }
}