:root {
  /* Palette de couleurs raffinée - Teal/Blue harmonieux */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-200: #bae6fd;
  --primary-300: #7dd3fc;
  --primary-400: #38bdf8;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-800: #075985;
  --primary-900: #0c4a6e;

  --primary-color: var(--primary-600);
  --primary-hover: var(--primary-700);
  --primary-light: var(--primary-100);

  --secondary-color: #8b5cf6;
  --secondary-hover: #7c3aed;
  --secondary-light: #ede9fe;

  --accent-color: #10b981;
  --accent-hover: #059669;
  --accent-light: #d1fae5;

  /* Couleurs sémantiques */
  --success: #10b981;
  --success-hover: #059669;
  --success-light: #d1fae5;
  --error: #ef4444;
  --error-hover: #dc2626;
  --error-light: #fee2e2;
  --warning: #f59e0b;
  --warning-hover: #d97706;
  --warning-light: #fef3c7;
  --info: #3b82f6;
  --info-hover: #2563eb;
  --info-light: #dbeafe;

  /* Surfaces et arrière-plans */
  --background: #f8fafc;
  --background-alt: #f1f5f9;
  --surface: #ffffff;
  --surface-elevated: #ffffff;
  --surface-border: #e2e8f0;
  --surface-hover: #f8fafc;

  /* Texte */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-on-primary: #ffffff;
  --text-on-secondary: #ffffff;

  /* Ombres raffinées avec plus de profondeur */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  /* Bordures */
  --radius-xs: 0.25rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Typographie améliorée */
  --font-heading: 'Space Grotesk', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-body: 'Plus Jakarta Sans', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

  /* Graphiques */
  --plot-grid: #e2e8f0;
  --plot-text: #0f172a;
  --plot-line: var(--primary-600);
  --plot-area: rgba(14, 165, 233, 0.1);

  /* Espacements */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
}

/* Dark Mode Variables */
.dark-mode {
  /* Couleurs primaires adaptées au dark mode */
  --primary-50: #0c4a6e;
  --primary-100: #075985;
  --primary-200: #0369a1;
  --primary-300: #0284c7;
  --primary-400: #0ea5e9;
  --primary-500: #38bdf8;
  --primary-600: #7dd3fc;
  --primary-700: #bae6fd;
  --primary-800: #e0f2fe;
  --primary-900: #f0f9ff;

  --primary-color: var(--primary-400);
  --primary-hover: var(--primary-300);
  --primary-light: var(--primary-800);

  --secondary-color: #a78bfa;
  --secondary-hover: #8b5cf6;
  --secondary-light: #4c1d95;

  --accent-color: #34d399;
  --accent-hover: #10b981;
  --accent-light: #065f46;

  /* Couleurs sémantiques */
  --success: #34d399;
  --success-hover: #10b981;
  --success-light: #064e3b;
  --error: #f87171;
  --error-hover: #ef4444;
  --error-light: #7f1d1d;
  --warning: #fbbf24;
  --warning-hover: #f59e0b;
  --warning-light: #78350f;
  --info: #60a5fa;
  --info-hover: #3b82f6;
  --info-light: #1e3a8a;

  /* Surfaces et arrière-plans */
  --background: #0f172a;
  --background-alt: #1e293b;
  --surface: #1e293b;
  --surface-elevated: #334155;
  --surface-border: #475569;
  --surface-hover: #334155;

  /* Texte */
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-on-primary: #0f172a;
  --text-on-secondary: #ffffff;

  /* Ombres plus prononcées en dark mode */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.5), 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.5);

  /* Graphiques */
  --plot-grid: #475569;
  --plot-text: #f1f5f9;
  --plot-line: var(--primary-400);
  --plot-area: rgba(56, 189, 248, 0.15);
}

/* ================= Reset & Typography ================= */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
}

/* Hiérarchie typographique améliorée */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-top: 0;
}

h1 {
  font-size: 3rem;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-xl);
  font-weight: 800;
}

h2 {
  font-size: 2.25rem;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-lg);
  font-weight: 700;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 65ch;
}

p.lead {
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 400;
  line-height: 1.8;
}

small, .text-sm {
  font-size: 0.875rem;
  color: var(--text-muted);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-weight: 500;
  position: relative;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

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

/* ================= Navigation ================= */
.navbar {
  background-color: var(--surface);
  border-bottom: 1px solid var(--surface-border);
  padding: var(--space-md) var(--space-2xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.8);
  transition: all var(--transition-normal);
}

.dark-mode .navbar {
  background-color: rgba(30, 41, 59, 0.8);
}

.nav-brand {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
}

.nav-brand svg {
  transition: transform var(--transition-normal);
}

.nav-brand:hover svg {
  transform: scale(1.1);
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  padding: var(--space-xs) 0;
  position: relative;
}

.nav-links a:hover {
  color: var(--primary-color);
}

.nav-links a.active {
  color: var(--primary-color);
  font-weight: 700;
}

/* ================= Layout ================= */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-2xl);
  width: 100%;
}

.section {
  margin-bottom: var(--space-2xl);
  scroll-margin-top: var(--space-2xl);
}

.section-header {
  margin-bottom: var(--space-xl);
  text-align: center;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto var(--space-xl);
  text-align: center;
}

.grid {
  display: grid;
  gap: var(--space-xl);
}

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

@media (min-width: 768px) {
  .grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Espacements utilitaires */
.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.p-3 { padding: var(--space-md); }
.p-4 { padding: var(--space-lg); }
.p-5 { padding: var(--space-xl); }

/* ================= Cards ================= */
.carte {
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.carte::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

.carte:hover::before {
  opacity: 1;
}

.carte-header {
  margin-bottom: var(--space-lg);
}

.carte-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.carte-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.carte-footer {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--surface-border);
}

/* ================= Forms ================= */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
  transition: color var(--transition-fast);
}

.form-label.required::after {
  content: '*';
  color: var(--error);
  margin-left: 2px;
}

.form-hint {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
  line-height: 1.4;
}

input[type="number"],
input[type="text"],
input[type="email"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-primary);
  background-color: var(--surface);
  border: 2px solid var(--surface-border);
  border-radius: var(--radius-lg);
  outline: none;
  transition: all var(--transition-normal);
  line-height: 1.5;
}

input[type="number"]:hover,
input[type="text"]:hover,
select:hover,
textarea:hover {
  border-color: var(--primary-light);
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus,
textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
  background-color: var(--surface);
}

input[type="number"]:disabled,
input[type="text"]:disabled,
select:disabled,
textarea:disabled {
  background-color: var(--background-alt);
  color: var(--text-muted);
  cursor: not-allowed;
  border-color: var(--surface-border);
}

input[type="file"] {
  width: 100%;
  padding: var(--space-md);
  background-color: var(--surface);
  border: 2px dashed var(--surface-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
}

input[type="file"]:hover {
  border-color: var(--primary-color);
  background-color: var(--primary-light);
}

/* Custom Radio Buttons */
.radio-group {
  display: flex;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.radio-group label {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  cursor: pointer;
  margin-bottom: 0;
  transition: color var(--transition-fast);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
}

.radio-group label:hover {
  background-color: var(--background);
  color: var(--primary-color);
}

.radio-group input[type="radio"] {
  margin-right: var(--space-sm);
  accent-color: var(--primary-color);
  width: 1.2rem;
  height: 1.2rem;
  cursor: pointer;
}

/* Checkbox personnalisé */
.checkbox-group {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  margin-bottom: var(--space-md);
}

.checkbox-group input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--primary-color);
  cursor: pointer;
}

.checkbox-group label {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  cursor: pointer;
  margin-bottom: 0;
}

/* ================= Buttons ================= */
.btn-group {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  background-color: var(--primary-color);
  color: var(--text-on-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  line-height: 1.5;
  text-decoration: none;
}

button::before, .btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

button:hover, .btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

button:active, .btn:active {
  transform: translateY(0);
  transition-duration: 0.1s;
}

button:active::before, .btn:active::before {
  width: 300px;
  height: 300px;
}

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

button:disabled, .btn:disabled {
  background-color: var(--surface-border);
  color: var(--text-muted);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

button:disabled:hover, .btn:disabled:hover {
  background-color: var(--surface-border);
  transform: none;
  box-shadow: none;
}

/* Secondary Button Variant */
button.secondary, .btn.secondary {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

button.secondary:hover:not(:disabled), .btn.secondary:hover:not(:disabled) {
  background-color: var(--primary-light);
  color: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-2px);
}

/* Accent Button Variant */
button.accent, .btn.accent {
  background-color: var(--accent-color);
  color: white;
}

button.accent:hover:not(:disabled), .btn.accent:hover:not(:disabled) {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
}

/* Ghost Button Variant */
button.ghost, .btn.ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

button.ghost:hover:not(:disabled), .btn.ghost:hover:not(:disabled) {
  background-color: var(--background);
  color: var(--primary-color);
  border-color: var(--surface-border);
}

/* Danger Button Variant */
button.danger, .btn.danger {
  background-color: var(--error);
  color: white;
}

button.danger:hover:not(:disabled), .btn.danger:hover:not(:disabled) {
  background-color: var(--error-hover);
  transform: translateY(-2px);
}

/* Button Sizes */
button.btn-sm, .btn.btn-sm {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
}

button.btn-lg, .btn.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: 1.125rem;
  font-weight: 700;
}

/* Button with icon */
button .btn-icon, .btn .btn-icon {
  width: 1.25rem;
  height: 1.25rem;
  transition: transform var(--transition-fast);
}

button:hover .btn-icon, .btn:hover .btn-icon {
  transform: translateX(2px);
}

/* ================= Media & Plots ================= */
.plot-container {
  background-color: var(--surface);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  border: 1px solid var(--surface-border);
  text-align: center;
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.plot-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  opacity: 0.7;
}

.plot-container img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition-normal);
}

.plot-container:hover img {
  transform: scale(1.01);
}

.plot-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.plot-description {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.audio-container {
  margin-top: var(--space-lg);
  padding: var(--space-xl);
  background-color: var(--surface);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: stretch;
  border: 1px solid var(--surface-border);
  transition: all var(--transition-normal);
}

.audio-container:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.audio-container label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

audio {
  width: 100%;
  outline: none;
  border-radius: var(--radius-lg);
  background-color: var(--background);
  padding: var(--space-sm);
}

audio::-webkit-media-controls-panel {
  background-color: var(--surface);
  border-radius: var(--radius-md);
}

audio::-webkit-media-controls-play-button,
audio::-webkit-media-controls-volume-slider,
audio::-webkit-media-controls-timeline {
  filter: invert(0.1);
}

.dark-mode audio::-webkit-media-controls-panel {
  background-color: var(--surface-elevated);
}

/* ================= Tables ================= */
.table-container {
  overflow-x: auto;
  margin-top: var(--space-xl);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-xl);
  background-color: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
}

th {
  background-color: var(--background);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-lg);
  border-bottom: 2px solid var(--surface-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

th:first-child {
  border-top-left-radius: var(--radius-xl);
}

th:last-child {
  border-top-right-radius: var(--radius-xl);
}

td {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--surface-border);
  vertical-align: middle;
  transition: background-color var(--transition-fast);
}

tr:last-child td {
  border-bottom: none;
}

tr:last-child td:first-child {
  border-bottom-left-radius: var(--radius-xl);
}

tr:last-child td:last-child {
  border-bottom-right-radius: var(--radius-xl);
}

tr:hover td {
  background-color: var(--surface-hover);
}

/* Striped rows */
tr:nth-child(even) td {
  background-color: var(--background-alt);
}

tr:nth-child(even):hover td {
  background-color: var(--surface-hover);
}

td a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

td a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Table actions */
.table-actions {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

/* Badge in table */
.table-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background-color: var(--primary-light);
  color: var(--primary-color);
}

/* ================= States & Utilities ================= */
.msg-success,
.msg-error,
.msg-info,
.msg-warning {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  margin-top: var(--space-md);
  margin-bottom: var(--space-md);
  font-weight: 500;
  line-height: 1.5;
  animation: fadeIn 0.3s ease-out;
}

.msg-success {
  color: var(--success);
  background-color: var(--success-light);
  border-left: 4px solid var(--success);
}

.msg-error {
  color: var(--error);
  background-color: var(--error-light);
  border-left: 4px solid var(--error);
}

.msg-info {
  color: var(--info);
  background-color: var(--info-light);
  border-left: 4px solid var(--info);
}

.msg-warning {
  color: var(--warning);
  background-color: var(--warning-light);
  border-left: 4px solid var(--warning);
}

.msg-success svg,
.msg-error svg,
.msg-info svg,
.msg-warning svg {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.hidden {
  display: none !important;
}

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

/* Loader Animation */
.loader-wrapper {
  display: none;
  gap: var(--space-md);
  align-items: center;
  justify-content: center;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--space-xl);
  background-color: var(--surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--surface-border);
  animation: fadeIn 0.3s ease-out;
}

.spinner {
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--surface-border);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.spinner.spinner-sm {
  width: 1rem;
  height: 1rem;
  border-width: 2px;
}

.spinner.spinner-lg {
  width: 3rem;
  height: 3rem;
  border-width: 4px;
}

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

/* Progress bar */
.progress-bar {
  width: 100%;
  height: 0.5rem;
  background-color: var(--surface-border);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-md);
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* Upload zone */
.upload-zone {
  border: 3px dashed var(--surface-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  background-color: var(--surface);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.upload-zone::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-light) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: 1;
}

.upload-zone:hover {
  border-color: var(--primary-color);
  background-color: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.upload-zone:hover::before {
  opacity: 0.3;
}

.upload-zone.drag-over {
  border-color: var(--accent-color);
  background-color: var(--accent-light);
  transform: scale(1.01);
}

.upload-zone input[type="file"] {
  display: none;
}

.upload-label {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  color: var(--text-secondary);
  position: relative;
  z-index: 2;
  gap: var(--space-md);
}

.upload-icon {
  width: 64px;
  height: 64px;
  color: var(--primary-color);
  transition: all var(--transition-normal);
}

.upload-zone:hover .upload-icon {
  color: var(--primary-hover);
  transform: scale(1.1);
}

.upload-label span {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.upload-label small {
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 400px;
  line-height: 1.5;
}

.file-name-display {
  margin-top: var(--space-lg);
  font-family: var(--font-mono);
  color: var(--text-primary);
  background: var(--surface);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  display: inline-block;
  font-size: 0.875rem;
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-fast);
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ===== 2026 Frontend Redesign Overrides ===== */
:root {
  --primary-color: #0e6cc9;
  --primary-hover: #0a579f;
  --primary-light: #e8f1ff;
  --secondary-color: #1254a3;
  --secondary-hover: #0f4281;
  --secondary-light: #ddeaff;
  --accent-color: #11b4c8;
  --accent-hover: #0a93a4;
  --accent-light: #d7f7fc;
  --background: #f4f8fc;
  --background-alt: #ebf2fa;
  --surface: #ffffff;
  --surface-elevated: #ffffff;
  --surface-border: #d7e4f4;
  --surface-hover: #f8fbff;
  --text-primary: #0d223d;
  --text-secondary: #284567;
  --text-muted: #4c6888;
  --plot-line: #0e6cc9;
  --plot-area: rgba(14, 108, 201, 0.12);
  --shadow-sm: 0 2px 8px rgba(17, 52, 94, 0.07);
  --shadow-md: 0 12px 32px rgba(14, 53, 99, 0.11);
  --shadow-lg: 0 18px 42px rgba(12, 46, 86, 0.15);
  --shadow-xl: 0 28px 60px rgba(10, 39, 75, 0.18);
}

.dark-mode {
  --primary-color: #56a6ff;
  --primary-hover: #7fbaff;
  --primary-light: #123a63;
  --secondary-color: #83b7ff;
  --secondary-hover: #9ec6ff;
  --secondary-light: #1e3d67;
  --accent-color: #4dd6e4;
  --accent-hover: #74e4f0;
  --accent-light: #11444f;
  --background: #08131f;
  --background-alt: #0d1d2e;
  --surface: #102338;
  --surface-elevated: #122a43;
  --surface-border: #284566;
  --surface-hover: #153150;
  --text-primary: #edf6ff;
  --text-secondary: #c4d9ef;
  --text-muted: #97b2cf;
  --plot-line: #56a6ff;
  --plot-area: rgba(86, 166, 255, 0.2);
}

body {
  background:
    radial-gradient(circle at 8% 8%, rgba(17, 180, 200, 0.1), transparent 32%),
    radial-gradient(circle at 92% 14%, rgba(14, 108, 201, 0.1), transparent 28%),
    linear-gradient(160deg, var(--background) 0%, var(--background-alt) 100%);
}

.container {
  max-width: 1200px;
  padding-top: 2.8rem;
  padding-bottom: 4.2rem;
}

.navbar {
  border-bottom: 1px solid var(--surface-border);
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--surface), transparent 12%);
}

.nav-brand span {
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 800;
}

.hero {
  border: 1px solid var(--surface-border);
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--primary-light), var(--surface) 55%) 0%, var(--surface) 100%);
  box-shadow: var(--shadow-lg);
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.7rem);
  line-height: 1.02;
}

.lead {
  max-width: 62ch;
  color: var(--text-secondary);
}

.feature-card,
.carte,
.plot-container,
.table-container {
  border: 1px solid var(--surface-border);
  background: var(--surface-elevated);
  box-shadow: var(--shadow-sm);
}

.feature-card:hover,
.carte:hover {
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--primary-color), var(--surface-border) 68%);
}

.carte {
  padding: clamp(1.4rem, 1.8vw, 2.2rem);
}

input,
select,
textarea {
  border: 1px solid var(--surface-border);
  background: var(--surface);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary-color), transparent 78%);
}

button,
.btn {
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

button:hover,
.btn:hover {
  box-shadow: 0 8px 18px rgba(14, 108, 201, 0.18);
}

button:disabled,
.btn:disabled {
  opacity: 0.58;
  cursor: not-allowed;
  box-shadow: none;
}

.msg-success,
.msg-error {
  border-width: 1px;
  border-style: solid;
  border-radius: var(--radius-lg);
  margin-top: var(--space-md);
}

.msg-success {
  border-color: color-mix(in srgb, var(--success), transparent 68%);
}

.msg-error {
  border-color: color-mix(in srgb, var(--error), transparent 64%);
}

.loader-wrapper {
  background: color-mix(in srgb, var(--primary-light), var(--surface) 72%);
}

.upload-zone {
  border-width: 2px;
  border-style: dashed;
  border-color: color-mix(in srgb, var(--primary-color), var(--surface-border) 55%);
  min-height: 250px;
  display: grid;
  place-items: center;
  gap: var(--space-md);
  padding: clamp(1.5rem, 3vw, 2.6rem);
}

.upload-zone::before {
  opacity: 0.12;
}

.upload-zone:hover {
  border-color: var(--primary-color);
  background: color-mix(in srgb, var(--primary-light), var(--surface) 48%);
  transform: none;
  box-shadow: var(--shadow-md);
}

.upload-zone.drag-over {
  border-color: var(--accent-color);
  background: color-mix(in srgb, var(--accent-light), var(--surface) 38%);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent-color), transparent 80%);
  transform: none;
}

.upload-zone:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary-color), transparent 78%);
}

.upload-label {
  width: min(100%, 520px);
  text-align: center;
  justify-content: center;
}

.upload-label span {
  font-size: clamp(1.08rem, 1.6vw, 1.28rem);
  line-height: 1.45;
}

.upload-zone:hover .upload-icon,
.upload-zone.drag-over .upload-icon {
  transform: none;
  color: var(--primary-color);
}

.upload-label small {
  color: var(--text-muted);
}

.file-name-display {
  background: color-mix(in srgb, var(--primary-light), var(--surface) 58%);
  border-color: color-mix(in srgb, var(--primary-color), transparent 72%);
}

.fft-card h2 {
  margin-bottom: 1.3rem;
}

#result-container h2,
#result-filtre-container h2 {
  margin-bottom: 1.1rem;
}

#result img,
#result-filtre img {
  width: 100%;
  border-radius: calc(var(--radius-lg) + 2px);
  border: 1px solid var(--surface-border);
  display: block;
  background: var(--surface);
}

.audio-container {
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-xl);
  background: color-mix(in srgb, var(--primary-light), var(--surface) 78%);
}

table thead th {
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.79rem;
}

.fade-in,
.feature-card,
.carte,
#result-container,
#result-filtre-container {
  animation: panelIn 0.5s ease both;
}

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

@media (max-width: 980px) {
  .grid.grid-cols-2 {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 2rem 1.35rem;
  }

  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

@media (max-width: 640px) {
  .upload-zone {
    min-height: 210px;
  }

  .cta-buttons {
    width: 100%;
  }

  .cta-button {
    width: 100%;
    justify-content: center;
  }
}

.file-name-display:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

/* ================= Dark Mode Toggle ================= */
.dark-mode-toggle {
  background: var(--surface);
  border: 2px solid var(--surface-border);
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  margin-left: var(--space-md);
  width: 3rem;
  height: 3rem;
  position: relative;
  overflow: hidden;
}

.dark-mode-toggle::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: 1;
}

.dark-mode-toggle svg {
  position: relative;
  z-index: 2;
  transition: transform var(--transition-normal);
  width: 1.25rem;
  height: 1.25rem;
}

.dark-mode-toggle:hover {
  color: var(--text-on-primary);
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.dark-mode-toggle:hover::before {
  opacity: 1;
}

.dark-mode-toggle:active {
  transform: translateY(0);
}

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

/* ================= Navigation améliorée ================= */
.nav-links a {
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-full);
  transition: width var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0.9;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-links a.active::after {
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  opacity: 1;
}

/* ================= Responsive Navigation ================= */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
  }

  .dark-mode-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
  }

  .container {
    padding: 1.5rem;
  }

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

/* ================= Graphiques Plotly ================= */
.plotly-graph {
  width: 100%;
  height: 500px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
}

.plotly-graph .modebar {
  background-color: var(--surface) !important;
}

/* ================= Landing Page ================= */
.hero {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  background: linear-gradient(135deg,
    rgba(14, 165, 233, 0.08) 0%,
    rgba(139, 92, 246, 0.05) 50%,
    rgba(16, 185, 129, 0.05) 100%);
  border-radius: var(--radius-2xl);
  margin-bottom: var(--space-2xl);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--surface-border);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 20% 80%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: 3.5rem;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-lg);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.025em;
}

.hero p {
  font-size: 1.375rem;
  max-width: 800px;
  margin: 0 auto var(--space-xl);
  color: var(--text-secondary);
  line-height: 1.7;
  font-weight: 400;
}

.cta-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

.cta-button {
  padding: var(--space-lg) var(--space-2xl);
  font-size: 1.125rem;
  border-radius: var(--radius-xl);
  font-weight: 700;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  border: none;
}

.cta-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.7s;
}

.cta-button:hover::before {
  left: 100%;
}

.cta-button.primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: var(--shadow-md);
}

.cta-button.primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.cta-button.secondary {
  background-color: var(--surface);
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.cta-button.secondary:hover {
  background-color: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.feature-card {
  background-color: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  text-align: center;
  border: 1px solid var(--surface-border);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-light);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-lg);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.75rem;
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ================= Animations ================= */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.pulse {
  animation: pulse 2s infinite;
}

/* ================= Améliorations des formulaires ================= */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 768px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.input-with-icon {
  position: relative;
}

.input-with-icon input {
  padding-left: 3rem;
}

.input-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

/* ================= Table améliorée ================= */
.table-container table {
  min-width: 800px;
}

.table-container::-webkit-scrollbar {
  height: 8px;
}

.table-container::-webkit-scrollbar-track {
  background: var(--background);
  border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb {
  background: var(--surface-border);
  border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ================= États de chargement ================= */
.loading-shimmer {
  background: linear-gradient(90deg,
    var(--surface) 0%,
    var(--background) 50%,
    var(--surface) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ===== V2 Proportion Rebalance ===== */
:root {
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --radius-xl: 1.125rem;
  --surface-border: #c8d9ec;
}

body {
  line-height: 1.55;
}

h1 {
  font-size: clamp(2.45rem, 4.6vw, 3.2rem);
}

h2 {
  font-size: clamp(1.75rem, 2.8vw, 2.2rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.45rem);
}

.container {
  max-width: 1240px;
  padding-top: 2.2rem;
  padding-bottom: 3.2rem;
}

.section {
  margin-bottom: 2.4rem;
}

.grid {
  gap: 1.25rem;
}

.carte,
.feature-card,
.plot-container {
  border-width: 1px;
  border-color: var(--surface-border);
  border-radius: var(--radius-xl);
  padding: clamp(1.2rem, 1.8vw, 1.65rem);
}

.carte:hover,
.feature-card:hover {
  transform: none;
}

.feature-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 0.9rem;
}

.feature-icon svg {
  width: 26px;
  height: 26px;
}

.form-group {
  margin-bottom: 1rem;
}

.form-label,
label[for],
.carte label {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 0.45rem;
}

input[type="number"],
input[type="text"],
select,
textarea {
  min-height: 42px;
  padding: 0.58rem 0.82rem;
  border-width: 1px;
  font-size: 0.98rem;
  border-radius: 0.78rem;
}

small,
.form-hint,
.carte small {
  font-size: 0.84rem;
  line-height: 1.45;
}

.radio-group {
  gap: 0.95rem;
  margin-bottom: 0.7rem;
}

.radio-group label {
  font-size: 0.94rem;
  font-weight: 600;
  padding: 0.28rem 0.45rem;
}

button,
.btn,
.cta-button {
  min-height: 42px;
  padding: 0.62rem 1.1rem;
  font-size: 0.98rem;
  font-weight: 700;
  border-radius: 0.85rem;
}

button.btn-lg,
.btn.btn-lg {
  min-height: 44px;
  padding: 0.68rem 1.2rem;
  font-size: 1.02rem;
}

button:hover,
.btn:hover,
.cta-button:hover {
  transform: none;
}

.hero {
  padding: 1.7rem 1.25rem;
  border-radius: 1.35rem;
  margin-bottom: 2rem;
}

.hero h1 {
  margin-bottom: 0.65rem;
}

.hero p,
p.lead {
  font-size: 1.04rem;
  line-height: 1.62;
  margin-bottom: 1rem;
}

.cta-buttons {
  margin-top: 1rem;
  gap: 0.75rem;
}

.upload-zone {
  min-height: 186px;
  padding: 1.2rem 1rem;
  gap: 0.7rem;
  border-width: 2px;
}

.upload-zone:hover,
.upload-zone.drag-over {
  transform: none;
}

.upload-icon {
  width: 52px;
  height: 52px;
}

.upload-label {
  width: min(100%, 560px);
  gap: 0.5rem;
}

.upload-label span {
  font-size: clamp(1.03rem, 1.45vw, 1.18rem);
  font-weight: 700;
}

.file-name-display {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  padding: 0.55rem 0.75rem;
}

#filtre-form h2,
.fft-card h2 {
  font-size: clamp(1.35rem, 2.1vw, 1.7rem);
  margin-bottom: 0.9rem;
}

.audio-container {
  padding: 1rem;
}

audio {
  min-height: 36px;
}

th {
  font-size: 0.75rem;
  padding: 0.7rem 0.85rem;
}

td {
  padding: 0.72rem 0.85rem;
}

.loader-wrapper {
  padding: 0.95rem;
}

@media (max-width: 980px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero {
    padding: 1.35rem 0.95rem;
  }
}

@media (max-width: 640px) {
  .upload-zone {
    min-height: 160px;
    padding: 1rem 0.85rem;
  }

  button,
  .btn,
  .cta-button {
    width: 100%;
  }

  .btn-group {
    width: 100%;
  }
}

/* Espace supplementaire avant la section Numerisation (Partie 1) */
#numerisation {
  margin-top: 2rem;
}

@media (max-width: 768px) {
  #numerisation {
    margin-top: 1.4rem;
  }
}