:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --text-color: #212529;
  --text-muted: #6c757d;
  --primary-color: #d97706;
  --primary-hover: #b45309;
  --border-color: #e5e7eb;
  --card-bg: #ffffff;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --error-color: #dc2626;
  --success-color: #16a34a;
}

body.dark-theme {
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --text-color: #f9fafb;
  --text-muted: #9ca3af;
  --border-color: #374151;
  --card-bg: #1f2937;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: var(--primary-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.section {
  padding: 50px 0;
}

.bg-light {
  background-color: var(--bg-secondary);
}

.section-intro {
  margin-bottom: 25px;
  color: var(--text-muted);
}

.grid {
  display: grid;
  gap: 20px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px 0;
}

.logo {
  font-size: 1.4rem;
  font-weight: bold;
  color: var(--text-color);
}

.logo span { color: var(--primary-color); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-menu ul {
  display: flex;
  list-style: none;
  gap: 20px;
}

.nav-menu a {
  color: var(--text-color);
  font-weight: 500;
}

.nav-menu a.active {
  color: var(--primary-color);
  border-bottom: 2px solid var(--primary-color);
}

.theme-btn {
  background: none;
  border: 1px solid var(--border-color);
  padding: 5px 10px;
  border-radius: 20px;
  cursor: pointer;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-color);
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--card-bg);
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
  }
  .nav-menu.open { display: flex; }
  .nav-menu ul { flex-direction: column; align-items: center; }
}

.hero {
  background-image: url('https://images.unsplash.com/photo-1513519245088-0e12902e5a38?auto=format&fit=crop&w=1350&q=80');
  background-size: cover;
  background-position: center;
  height: 60vh;
  min-height: 380px;
  display: flex;
  align-items: center;
}

.hero-overlay {
  background: rgba(0, 0, 0, 0.65);
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #ffffff;
  padding: 0 20px;
}

.hero-content h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.hero-content p {
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  text-decoration: none;
}

.card, .stat-card, .partner-card, .testimonial-card, .stand-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.stat-card { text-align: center; }
.stat-card h3 { font-size: 1.8rem; color: var(--primary-color); }

.partner-card { text-align: center; }
.partner-logo { font-size: 2rem; margin-bottom: 10px; }

.testimonial-card .avatar { font-size: 2rem; margin-bottom: 10px; }
.testimonial-card .role { font-size: 0.85rem; color: var(--text-muted); display: block; margin-bottom: 10px; }

.stand-card {
  display: flex;
  flex-direction: column;
}

.stand-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 12px;
}

.stand-card .entreprise { color: var(--primary-color); font-weight: 600; margin-bottom: 6px; }
.stand-card .adresse { color: var(--text-muted); font-size: 0.9rem; }

.filter-container {
  margin-bottom: 25px;
}

.filter-container input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--card-bg);
  color: var(--text-color);
  font-size: 1rem;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--card-bg);
  color: var(--text-color);
  font-size: 1rem;
}

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

.error-message {
  color: var(--error-color);
  font-size: 0.85rem;
  margin-top: 4px;
  display: block;
}

.alert-success {
  background-color: #d1fae5;
  color: #065f46;
  padding: 12px;
  border-radius: 6px;
  margin-bottom: 15px;
  border: 1px solid #a7f3d0;
}

.map-box {
  margin: 20px 0;
}

.social-links {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

.social-btn {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-color);
}

.footer {
  background-color: var(--card-bg);
  border-top: 1px solid var(--border-color);
  padding: 30px 0;
  margin-top: 40px;
}

.footer-content ul {
  list-style: none;
}

.footer-content li {
  margin-bottom: 6px;
}