/* ============================================
   ISF - PLATEFORME DE FORMATION
   Design Premium Minimaliste
   ============================================ */

:root {
  /* Couleurs primaires */
  --primary: #b91c1c;
  --primary-light: #dc2626;
  --primary-dark: #7f1d1d;
  
  /* Accents */
  --accent: #ef4444;
  --accent-light: #fca5a5;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  /* Neutres */
  --bg-light: #ffffff;
  --bg-alt: #f8fafc;
  --border-light: #e2e8f0;
  --text-dark: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  
  /* Dark mode */
  --bg-dark: #090708;
  --bg-dark-alt: #140c0e;
  --border-dark: #3a1b21;
  --text-light: #f8f3f4;
  --text-light-secondary: #dbc8cc;
  
  /* Espacements */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 16px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-2xl: 48px;
  
  /* Typographie */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', sans-serif;
  --font-mono: 'Fira Code', 'Monaco', monospace;
  
  /* Ombres */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 28px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.16);
  
  /* Transitions */
  --trans-fast: 150ms ease;
  --trans-base: 250ms ease;
  --trans-slow: 350ms ease;
  
  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-bg: 400;
  --z-modal: 500;
  --z-toast: 600;
  --z-tooltip: 700;
}

/* Mode sombre */
html.dark-mode {
  --bg-light: var(--bg-dark);
  --bg-alt: var(--bg-dark-alt);
  --border-light: var(--border-dark);
  --text-dark: var(--text-light);
  --text-secondary: var(--text-light-secondary);
  --text-tertiary: rgba(255, 221, 228, 0.48);
}

/* ============================================
   RESET ET BASE
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--bg-light);
  position: relative;
  transition: background-color var(--trans-base), color var(--trans-base);
}

/* Transitions de navigation entre pages (actives via JS) */
html.js-page-transitions body {
  opacity: 1;
  transform: none;
  transition: background-color var(--trans-base), color var(--trans-base);
}

html.js-page-transitions body.page-ready {
  opacity: 1;
  transform: none;
}

html.js-page-transitions body.page-leaving {
  opacity: 1;
  transform: none;
}

.isf-page-logo-transition {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(1px);
  -webkit-backdrop-filter: blur(1px);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  z-index: 5000;
  transition: opacity 820ms ease, visibility 820ms ease;
}

.isf-page-logo-transition img {
  width: clamp(150px, 18vw, 260px);
  height: auto;
  transform: scale(0.92);
  filter: drop-shadow(0 8px 24px rgba(127, 29, 29, 0.18));
  transition: transform 1100ms cubic-bezier(0.22, 1, 0.36, 1), opacity 1000ms ease;
}

.isf-page-logo-transition.active {
  opacity: 1;
  visibility: visible;
}

.isf-page-logo-transition.active.blocking {
  opacity: 1;
  visibility: visible;
}

.isf-page-logo-transition.active img {
  transform: scale(1);
}

.isf-page-logo-transition.active.logo-out img {
  opacity: 0;
  transform: scale(1.1);
}

html.dark-mode .isf-page-logo-transition {
  background: rgba(8, 6, 7, 0.97);
}

@media (prefers-reduced-motion: reduce) {
  html.js-page-transitions body,
  html.js-page-transitions body.page-ready,
  html.js-page-transitions body.page-leaving {
    transition: none;
    transform: none;
  }

  .isf-page-logo-transition,
  .isf-page-logo-transition img {
    transition: none;
    transform: none;
  }
}

html.dark-mode body {
  background:
    radial-gradient(1200px 700px at 14% -8%, rgba(183, 28, 50, 0.18), transparent 60%),
    radial-gradient(1000px 620px at 92% 108%, rgba(127, 29, 29, 0.2), transparent 62%),
    linear-gradient(180deg, #0a0809 0%, #0d090a 45%, #090708 100%);
}

/* Filigrane global ISF: fixe, discret et immobile au scroll */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url('/Logo ISF.png');
  background-repeat: no-repeat;
  background-position: center center;
  background-size: min(130vmin, 2200px);
  opacity: 0.03;
  pointer-events: none;
  z-index: 999;
}

@media (max-width: 768px) {
  body::before {
    /* Ensure full logo remains visible on narrow screens */
    background-size: min(92vw, 92vh);
    background-position: center center;
  }
}

/* ============================================
   TYPOGRAPHIE
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.5px;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--sp-lg);
}

h2 {
  font-size: 2rem;
  margin-bottom: var(--sp-lg);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--sp-md);
}

h4 {
  font-size: 1.25rem;
  margin-bottom: var(--sp-md);
}

h5 {
  font-size: 1.125rem;
  margin-bottom: var(--sp-sm);
}

h6 {
  font-size: 1rem;
  margin-bottom: var(--sp-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--trans-fast);
}

a:hover {
  color: var(--accent-light);
}

/* ============================================
   BOUTONS
   ============================================ */

button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-sm);
  padding: 10px 24px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--trans-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

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

.btn-primary:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  background-color: var(--bg-alt);
  color: var(--text-dark);
  border-color: var(--border-light);
}

.btn-secondary:hover {
  background-color: var(--border-light);
  border-color: var(--text-secondary);
}

.btn-ghost {
  background-color: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-ghost:hover {
  background-color: transparent;
  color: var(--accent-light);
  border-color: var(--accent-light);
}

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

.btn-danger:hover {
  background-color: #dc2626;
  border-color: #dc2626;
}

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

.btn-success:hover {
  background-color: #059669;
  border-color: #059669;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 12px 32px;
  font-size: 1.125rem;
}

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

/* ============================================
   FORMULAIRES
   ============================================ */

input, textarea, select {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 1rem;
  border: 2px solid var(--border-light);
  border-radius: 8px;
  background-color: var(--bg-light);
  color: var(--text-dark);
  transition: all var(--trans-fast);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

input:disabled,
textarea:disabled,
select:disabled {
  background-color: var(--bg-alt);
  color: var(--text-tertiary);
  cursor: not-allowed;
}

input.error,
textarea.error,
select.error {
  border-color: var(--danger);
}

label {
  display: block;
  margin-bottom: var(--sp-sm);
  font-weight: 500;
  color: var(--text-dark);
}

.form-group {
  margin-bottom: var(--sp-lg);
}

.form-error {
  color: var(--danger);
  font-size: 0.875rem;
  margin-top: var(--sp-sm);
}

.form-help {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: var(--sp-sm);
}

/* ============================================
   CARTES
   ============================================ */

.card {
  background-color: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: var(--sp-lg);
  transition: all var(--trans-base);
}

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

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-md);
  padding-bottom: var(--sp-md);
  border-bottom: 1px solid var(--border-light);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.card-body {
  margin-bottom: var(--sp-md);
}

.card-footer {
  display: flex;
  gap: var(--sp-md);
  padding-top: var(--sp-md);
  border-top: 1px solid var(--border-light);
}

/* ============================================
   TABLEAUX
   ============================================ */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

thead {
  background-color: var(--bg-alt);
  border-bottom: 2px solid var(--border-light);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text-dark);
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
}

tbody tr:hover {
  background-color: var(--bg-alt);
}

/* ============================================
   MODALES
   ============================================ */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal-bg);
  animation: fadeIn var(--trans-fast) ease;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background-color: var(--bg-light);
  border-radius: 16px;
  padding: var(--sp-xl);
  max-width: 500px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  animation: slideUp var(--trans-base) ease;
  z-index: var(--z-modal);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-lg);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0;
  transition: color var(--trans-fast);
}

.modal-close:hover {
  color: var(--text-dark);
}

.modal-body {
  margin-bottom: var(--sp-lg);
}

.modal-footer {
  display: flex;
  gap: var(--sp-md);
  justify-content: flex-end;
  padding-top: var(--sp-lg);
  border-top: 1px solid var(--border-light);
}

/* ============================================
   CONTENEURS DE LAYOUT
   ============================================ */

.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--sp-lg);
}

.container-sm {
  max-width: 600px;
}

.container-md {
  max-width: 900px;
}

.grid {
  display: grid;
  gap: var(--sp-lg);
}

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

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-between {
  justify-content: space-between;
}

.flex-center {
  justify-content: center;
}

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

.gap-sm {
  gap: var(--sp-sm);
}

.gap-md {
  gap: var(--sp-md);
}

.gap-lg {
  gap: var(--sp-lg);
}

/* ============================================
   UTILITAIRES
   ============================================ */

.hidden {
  display: none !important;
}

.invisible {
  visibility: hidden;
}

.mt-sm { margin-top: var(--sp-sm); }
.mt-md { margin-top: var(--sp-md); }
.mt-lg { margin-top: var(--sp-lg); }
.mt-xl { margin-top: var(--sp-xl); }

.mb-sm { margin-bottom: var(--sp-sm); }
.mb-md { margin-bottom: var(--sp-md); }
.mb-lg { margin-bottom: var(--sp-lg); }
.mb-xl { margin-bottom: var(--sp-xl); }

.px-sm { padding-left: var(--sp-sm); padding-right: var(--sp-sm); }
.px-md { padding-left: var(--sp-md); padding-right: var(--sp-md); }
.px-lg { padding-left: var(--sp-lg); padding-right: var(--sp-lg); }

.py-sm { padding-top: var(--sp-sm); padding-bottom: var(--sp-sm); }
.py-md { padding-top: var(--sp-md); padding-bottom: var(--sp-md); }
.py-lg { padding-top: var(--sp-lg); padding-bottom: var(--sp-lg); }

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

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

.text-sm {
  font-size: 0.875rem;
}

.text-lg {
  font-size: 1.125rem;
}

.font-bold {
  font-weight: 700;
}

.font-semibold {
  font-weight: 600;
}

.font-medium {
  font-weight: 500;
}

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

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

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

.bg-success {
  background-color: rgba(16, 185, 129, 0.1);
}

.bg-danger {
  background-color: rgba(239, 68, 68, 0.1);
}

.bg-warning {
  background-color: rgba(245, 158, 11, 0.1);
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-light);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  html,
  body {
    overflow-x: auto;
  }

  body {
    font-size: 15px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

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

  .container {
    padding: 0 12px;
  }

  .card {
    padding: var(--sp-md);
  }

  .modal {
    width: calc(100% - 20px);
    max-width: 100%;
    padding: var(--sp-lg);
  }

  table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.84rem;
    white-space: nowrap;
  }

  th,
  td {
    padding: 8px 10px;
    word-break: normal;
    overflow-wrap: normal;
    white-space: nowrap;
    vertical-align: top;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  button, .btn {
    padding: 10px 16px;
    font-size: 0.95rem;
  }

  table {
    font-size: 0.78rem;
  }

  th,
  td {
    padding: 6px 8px;
  }
}

/* ============================================
   BARRE DE SCROLLBAR (MODERN)
   ============================================ */

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-alt);
}

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}