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

:root {
  --bg: #ffffff;
  --text: #000000;
  --text-muted: #666666;
  --border: #e5e5e5;
  --hover: #f5f5f5;
}

[data-theme="dark"] {
  /* Fond nuit plus doux, gris-bleu très foncé plutôt que noir pur */
  --bg: #020617;
  --text: #ffffff;
  --text-muted: #9ca3af;
  --border: #1f2933;
  --hover: #111827;
}

/* Base */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  background-image: 
    radial-gradient(ellipse at top, rgba(30, 58, 138, 0.25) 0%, transparent 60%),
    radial-gradient(ellipse at bottom, rgba(15, 23, 42, 0.3) 0%, transparent 60%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  transition: background 0.3s ease, color 0.3s ease, background-image 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[data-theme="dark"] body {
  background-image: 
    radial-gradient(ellipse at top, rgba(59, 130, 246, 0.2) 0%, transparent 60%),
    radial-gradient(ellipse at bottom, rgba(30, 58, 138, 0.25) 0%, transparent 60%);
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  padding: 0.5rem 1rem;
}

.nav-container {
  max-width: 1200px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--border);
  padding: 0.5rem 1.5rem;
  border-radius: 12px;
  backdrop-filter: blur(10px);
  background: transparent;
  margin: 0.5rem;
}

[data-theme="dark"] .nav-container {
  background: transparent;
}

.nav-links {
  display: flex;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 400;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  transition: all 0.2s ease;
  display: inline-block;
  border: 1px solid transparent;
}

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

.nav-links a.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.nav-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  padding: 0;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text);
  font-size: 0.85rem;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}

.theme-toggle:hover {
  background: var(--hover);
  border-color: var(--text);
}

.lang-selector {
  position: relative;
}

.lang-toggle {
  background: none;
  border: 1px solid var(--border);
  padding: 0;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text);
  font-size: 0.85rem;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}

.lang-toggle:hover {
  background: var(--hover);
  border-color: var(--text);
}

.lang-toggle #currentLang,
.lang-toggle .fa-chevron-down {
  display: none;
}

.lang-toggle .flag-icon {
  font-size: 1.2rem;
}

.flag-icon {
  font-size: 1.2rem;
}

/* Buttons */
.btn {
  padding: 0.75rem 2rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn:hover {
  background: var(--hover);
  opacity: 0.8;
}

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

.btn-primary:hover {
  opacity: 0.8;
}

.btn-pdf {
  background: var(--text);
  color: var(--bg);
  border: none;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-pdf:hover {
  opacity: 0.8;
  transform: translateY(-1px);
}

[data-theme="dark"] .btn-pdf {
  background: var(--text);
  color: var(--bg);
}

/* Main Content */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 6rem 2rem 4rem;
  position: relative;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

/* Responsive */
@media (max-width: 768px) {
  nav {
    padding: 0.5rem 0.5rem;
  }

  .nav-container {
    margin: 0.5rem;
    padding: 0.5rem 1rem;
  }

  .nav-links {
    gap: 0.25rem;
  }

  .nav-links a {
    font-size: 0.75rem;
    padding: 0.35rem 0.6rem;
  }
}