/* ============================================================
   main.css — Design system QCM Éduli
   Palette : Navy profond → Indigo → Violet
   ============================================================ */

/* ---- Import Google Fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---- Variables CSS (Design Tokens) ---- */
:root {
  /* Couleurs principales */
  --color-bg:          #0b0f1e;
  --color-surface:     #111827;
  --color-surface-2:   #1a2235;
  --color-border:      rgba(99, 102, 241, 0.2);
  --color-border-hover:rgba(99, 102, 241, 0.5);

  /* Accent – Indigo */
  --color-primary:     #6366f1;
  --color-primary-h:   #818cf8;
  --color-primary-d:   #4f46e5;
  --color-primary-glow:rgba(99, 102, 241, 0.35);

  /* Accent secondaire – Violet */
  --color-secondary:   #a855f7;
  --color-secondary-h: #c084fc;

  /* Statuts */
  --color-success:     #10b981;
  --color-warning:     #f59e0b;
  --color-error:       #ef4444;
  --color-info:        #3b82f6;

  /* Texte */
  --color-text:        #f1f5f9;
  --color-text-muted:  #94a3b8;
  --color-text-faint:  #475569;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --grad-surface: linear-gradient(160deg, #111827 0%, #1a2235 100%);
  --grad-hero:    linear-gradient(135deg, #0b0f1e 0%, #1a1040 50%, #0b0f1e 100%);

  /* Ombres */
  --shadow-sm:   0 2px 8px rgba(0,0,0,0.4);
  --shadow-md:   0 8px 24px rgba(0,0,0,0.5);
  --shadow-lg:   0 16px 48px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 30px rgba(99,102,241,0.2);

  /* Typographie */
  --font-sans: 'Inter', system-ui, sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Transitions */
  --transition: 0.2s ease;
  --transition-slow: 0.4s ease;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary-h);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-secondary-h); }

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

/* ---- Layout principal ---- */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ---- Sidebar ---- */
.sidebar {
  width: 260px;
  min-height: 100vh;
  background: var(--grad-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  padding: 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform var(--transition-slow);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 16px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-logo-icon {
  width: 42px; height: 42px;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glow);
}

.sidebar-logo-img {
  width: 100%;
  max-width: 180px;
  height: auto;
  max-height: 64px;
  object-fit: contain;
}

.sidebar-logo-text {
  font-size: 18px;
  font-weight: 700;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-logo-sub {
  font-size: 11px;
  color: var(--color-text-muted);
  font-weight: 400;
  -webkit-text-fill-color: var(--color-text-muted);
}

.sidebar-user {
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--grad-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
  font-weight: 700;
  flex-shrink: 0;
}

.sidebar-user-info .user-name {
  font-size: 14px;
  font-weight: 600;
}
.sidebar-user-info .user-role {
  font-size: 11px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.nav-section-title {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  padding: 8px 8px 4px;
  margin-top: 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
  margin-bottom: 2px;
  position: relative;
}

.nav-item:hover {
  background: rgba(99,102,241,0.12);
  color: var(--color-text);
}

.nav-item.active {
  background: rgba(99,102,241,0.18);
  color: var(--color-primary-h);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 70%;
  background: var(--grad-primary);
  border-radius: 0 3px 3px 0;
}

.nav-item-icon {
  font-size: 18px;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid var(--color-border);
}

.btn-logout {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-error);
  font-size: 14px;
  font-weight: 500;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-logout:hover {
  background: rgba(239,68,68,0.12);
  color: #f87171;
}

/* ---- Contenu principal ---- */
.main-content {
  flex: 1;
  margin-left: 260px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-header {
  padding: 32px 40px 0;
}

.page-title {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 4px;
}

.page-subtitle {
  font-size: 14px;
  color: var(--color-text-muted);
}

.page-body {
  padding: 24px 40px 40px;
  flex: 1;
}

/* ---- Cards ---- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
}

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

.card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-subtitle {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

/* ---- Stats grid ---- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-primary);
}

.stat-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-value {
  font-size: 32px;
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.stat-icon {
  position: absolute;
  top: 16px; right: 16px;
  font-size: 28px;
  opacity: 0.15;
}

/* ---- Grille de contenu ---- */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.content-grid.single { grid-template-columns: 1fr; }
.content-grid.thirds { grid-template-columns: 2fr 1fr; }

/* ---- Tableaux ---- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead th {
  background: var(--color-surface-2);
  padding: 12px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

thead th:first-child { border-radius: var(--radius-sm) 0 0 0; }
thead th:last-child  { border-radius: 0 var(--radius-sm) 0 0; }

tbody tr {
  border-bottom: 1px solid rgba(99,102,241,0.06);
  transition: background var(--transition);
}

tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: rgba(99,102,241,0.06); }

tbody td {
  padding: 12px 16px;
  vertical-align: middle;
}

/* ---- Badges ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
}

.badge-primary  { background: rgba(99,102,241,0.18); color: var(--color-primary-h); }
.badge-success  { background: rgba(16,185,129,0.15); color: #34d399; }
.badge-warning  { background: rgba(245,158,11,0.15); color: #fbbf24; }
.badge-error    { background: rgba(239,68,68,0.15);  color: #f87171; }
.badge-muted    { background: rgba(148,163,184,0.12);color: var(--color-text-muted); }

/* ---- Boutons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99,102,241,0.45);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary-h);
  border-color: var(--color-border-hover);
}
.btn-secondary:hover {
  background: rgba(99,102,241,0.1);
  border-color: var(--color-primary);
  color: var(--color-primary-h);
}

.btn-danger {
  background: transparent;
  color: var(--color-error);
  border-color: rgba(239,68,68,0.3);
}
.btn-danger:hover {
  background: rgba(239,68,68,0.1);
  border-color: var(--color-error);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ---- Formulaires ---- */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-control {
  width: 100%;
  padding: 11px 14px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 14px;
  font-family: var(--font-sans);
  transition: all var(--transition);
  outline: none;
}

.form-control::placeholder { color: var(--color-text-faint); }

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
  background: var(--color-surface);
}

textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%2394a3b8' d='M4 6l4 4 4-4z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 36px;
}

.form-hint {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 5px;
}

.form-error {
  font-size: 12px;
  color: var(--color-error);
  margin-top: 5px;
}

/* ---- Messages Flash ---- */
.flash {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 20px;
  border: 1px solid transparent;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.flash-icon { font-size: 16px; }

.flash-success {
  background: rgba(16,185,129,0.12);
  border-color: rgba(16,185,129,0.3);
  color: #34d399;
}

.flash-error {
  background: rgba(239,68,68,0.12);
  border-color: rgba(239,68,68,0.3);
  color: #f87171;
}

.flash-info {
  background: rgba(59,130,246,0.12);
  border-color: rgba(59,130,246,0.3);
  color: #60a5fa;
}

.flash-warning {
  background: rgba(245,158,11,0.12);
  border-color: rgba(245,158,11,0.3);
  color: #fbbf24;
}

/* ---- Page de login (plein écran) ---- */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
  padding: 24px;
}

.login-page::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(99,102,241,0.15) 0%, transparent 70%);
  top: -150px; left: -150px;
  pointer-events: none;
}

.login-page::after {
  content: '';
  position: absolute;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(168,85,247,0.12) 0%, transparent 70%);
  bottom: -100px; right: -100px;
  pointer-events: none;
}

.login-box {
  width: 100%;
  max-width: 420px;
  background: rgba(17,24,39,0.8);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 40px;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  animation: fadeUp 0.5s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.login-logo {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo-icon, .login-logo-img {
  width: 64px; height: 64px;
  object-fit: contain;
  border-radius: var(--radius-lg);
  margin: 0 auto 16px;
  display: block;
  box-shadow: 0 8px 32px rgba(99,102,241,0.4);
}

.login-logo h1 {
  font-size: 24px;
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-logo p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.login-tabs {
  display: flex;
  gap: 4px;
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 28px;
}

.login-tab {
  flex: 1;
  text-align: center;
  padding: 8px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.login-tab.active {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}

/* ---- Quiz cards ---- */
.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.quiz-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.quiz-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad-primary);
}

.quiz-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.quiz-card-icon {
  width: 48px; height: 48px;
  background: rgba(99,102,241,0.15);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
}

.quiz-card-title {
  font-size: 16px;
  font-weight: 700;
}

.quiz-card-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  flex: 1;
}

.quiz-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

/* ---- Responsive Mobile ---- */
.hamburger {
  display: none;
  position: fixed;
  top: 16px; left: 16px;
  z-index: 200;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px 10px;
  cursor: pointer;
  font-size: 20px;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    z-index: 150;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }

  .hamburger { display: block; }

  .page-header { padding: 60px 20px 0; }
  .page-body   { padding: 20px; }

  .content-grid,
  .content-grid.thirds {
    grid-template-columns: 1fr;
  }

  .stats-grid { grid-template-columns: 1fr 1fr; }
}

/* ---- Divers ---- */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.4;
}

.empty-state-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 20px 0;
}

.text-muted    { color: var(--color-text-muted); }
.text-sm       { font-size: 13px; }
.text-xs       { font-size: 11px; }
.font-bold     { font-weight: 700; }
.mt-1          { margin-top: 8px; }
.mt-2          { margin-top: 16px; }
.mt-3          { margin-top: 24px; }
.mb-1          { margin-bottom: 8px; }
.mb-2          { margin-bottom: 16px; }
.flex          { display: flex; }
.items-center  { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2         { gap: 16px; }
.gap-1         { gap: 8px; }
.w-full        { width: 100%; }

/* ---- Dropzone Glisser-Déposer (Quiz Zip/HTML) ---- */
.dropzone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  background: rgba(17, 24, 39, 0.5);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--color-primary-h);
  background: rgba(99, 102, 241, 0.08);
  box-shadow: var(--shadow-glow);
}

.dropzone.dragover {
  transform: scale(1.01);
  border-style: solid;
}

.dropzone-icon {
  font-size: 42px;
  margin-bottom: 10px;
  display: inline-block;
  transition: transform var(--transition);
}

.dropzone:hover .dropzone-icon, .dropzone.dragover .dropzone-icon {
  transform: translateY(-4px) scale(1.1);
}

.dropzone-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}

.dropzone-desc {
  font-size: 13px;
  color: var(--color-text-muted);
}

.dropzone-file-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 12px;
  padding: 8px 14px;
  background: rgba(99, 102, 241, 0.15);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-hover);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary-h);
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

/* ---- Modale d'aperçu de Quiz ---- */
.modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(11, 15, 30, 0.85);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  padding: 20px;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-container {
  width: 90vw;
  max-width: 1000px;
  height: 85vh;
  min-height: 550px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: scale(0.95);
  transition: transform var(--transition);
  margin: auto;
}

.modal-backdrop.open .modal-container {
  transform: scale(1);
}

.modal-header {
  padding: 16px 24px;
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.modal-close:hover {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-error);
}

.modal-body {
  flex: 1;
  background: var(--color-surface);
  position: relative;
  overflow: hidden;
  height: calc(100% - 57px);
}

.modal-iframe {
  width: 100%;
  height: 100%;
  min-height: 480px;
  border: none;
  background: #fff;
  display: block;
}