body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: #ffffff;
  color: #1a1a1a;
  line-height: 1.5;
}

header {
  background: #ffffff;
  padding: 100px 20px 80px 20px;
  text-align: center;
  border-bottom: 1px solid #f0f0f0;
}

header h1 {
  font-size: 3.5em;
  font-weight: 700;
  margin-bottom: 20px;
  color: #1a1a1a;
  letter-spacing: -1px;
  line-height: 1.1;
}

.brand-name {
  color: #2563eb;
}

header p {
  font-size: 1.25em;
  color: #6b7280;
  max-width: 600px;
  margin: 0 auto 40px auto;
  font-weight: 400;
}

nav {
  background: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  border-bottom: 1px solid #f0f0f0;
}

.nav-links {
  display: flex;
  justify-content: center;
  flex: 1;
}

nav a {
  color: #374151;
  text-decoration: none;
  margin: 0 24px;
  font-weight: 500;
  font-size: 15px;
  transition: color 0.2s ease;
}

nav a:hover {
  color: #2563eb;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-actions .app-links {
  display: flex;
  flex-direction: row;
  gap: 2px;
  align-items: center;
}

.header-actions .app-link {
  display: inline-block;
  background: #2563eb;
  color: white !important;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
  font-size: 13px;
  transition: all 0.2s ease;
  text-align: center;
  min-width: auto;
  white-space: nowrap;
}

.header-actions .app-link:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.header-actions .login-link {
  background: #f8f9fa !important;
  color: #374151 !important;
  border: 1px solid #e5e7eb;
  font-weight: 600 !important;
}

.header-actions .login-link:hover {
  background: #e5e7eb !important;
  color: #1f2937 !important;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
  transform: translateY(-1px);
}

.header-actions .login-link:disabled {
  background: #6b7280 !important;
  color: white !important;
  border: 1px solid #6b7280;
  cursor: not-allowed !important;
  opacity: 0.7;
}

.header-actions .login-link:disabled:hover {
  background: #6b7280 !important;
  color: white !important;
  transform: none !important;
  box-shadow: none !important;
}

.language-selector {
  display: flex;
  gap: 8px;
}

.lang-btn {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: #6b7280;
  transition: all 0.2s ease;
}

.lang-btn.active {
  background: #2563eb;
  color: white;
  border-color: #2563eb;
}

.lang-btn:hover {
  background: #f3f4f6;
  border-color: #d1d5db;
}

.lang-btn.active:hover {
  background: #1d4ed8;
}

section {
  padding: 80px 20px;
  max-width: 1200px;
  margin: auto;
}

section h2 {
  font-size: 2.5em;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  color: #1a1a1a;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

#visuel {
  padding-top: 40px;
  background: #fafbff;
  margin: 0;
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

#visuel > * {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

#features {
  background: #ffffff;
}

#avantages {
  background: #ffffff;
}

#contact {
  background: #fafbff;
  margin: 0;
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

#contact > * {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

#tutorial {
  background: #fafbff;
  margin: 0;
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

#tutorial > * {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

#temoignages {
  background: #ffffff;
}

#essai {
  background: #f8faff;
  margin: 0;
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

#essai > * {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.cta {
  text-align: center;
  margin: 40px 0;
}

.cta button {
  background: #2563eb;
  color: white;
  border: none;
  padding: 16px 32px;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.cta button:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  margin-top: 60px;
}

.feature {
  background: #ffffff;
  padding: 32px;
  border-radius: 12px;
  border: 1px solid #f0f0f0;
  transition: all 0.2s ease;
}

.feature:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  border-color: #e5e7eb;
}

.feature h3 {
  color: #1a1a1a;
  font-size: 1.25em;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature p {
  color: #6b7280;
  font-size: 15px;
  line-height: 1.6;
}

.testimonial {
  background: #fff;
  border-left: 5px solid #5565f0;
  padding: 20px;
  margin: 20px 0;
  border-radius: 5px;
}

/* Contact section styles */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-top: 60px;
}

.contact-info h3 {
  color: #1a1a1a;
  font-size: 1.5em;
  font-weight: 600;
  margin-bottom: 16px;
}

.contact-info p {
  color: #6b7280;
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 30px;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-method {
  background: #f9fafb;
  padding: 24px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
}

.contact-method h4 {
  color: #1a1a1a;
  font-size: 1.1em;
  font-weight: 600;
  margin-bottom: 8px;
}

.contact-method p {
  color: #6b7280;
  font-size: 14px;
  margin: 0;
}

.contact-method a {
  color: #2563eb;
  text-decoration: none;
}

.contact-method a:hover {
  text-decoration: underline;
}

.contact-form {
  background: #fafbff;
  padding: 40px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
}

.contact-form h3 {
  color: #1a1a1a;
  font-size: 1.5em;
  font-weight: 600;
  margin-bottom: 24px;
}

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

.form-group label {
  display: block;
  color: #374151;
  font-weight: 500;
  margin-bottom: 8px;
  font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: white;
  box-sizing: border-box;
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.submit-btn {
  background: #2563eb;
  color: white;
  border: none;
  padding: 16px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.submit-btn:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Tutorial section styles */
.tutorial-content {
  margin-top: 60px;
  text-align: center;
}

.tutorial-intro {
  max-width: 800px;
  margin: 0 auto 40px auto;
}

.tutorial-intro h3 {
  color: #1a1a1a;
  font-size: 1.5em;
  font-weight: 600;
  margin-bottom: 16px;
}

.tutorial-intro p {
  color: #6b7280;
  font-size: 16px;
  line-height: 1.6;
}

.video-container {
  position: relative;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 12px;
}

/* Footer styles */
footer {
  background: #1a1a1a;
  color: #ffffff;
  padding: 60px 20px 20px 20px;
  margin-top: 80px;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
}

.footer-section {
  text-align: center;
  max-width: 400px;
}

.footer-section h3 {
  color: #ffffff;
  font-size: 1.2em;
  font-weight: 600;
  margin-bottom: 16px;
  border-bottom: 2px solid #2563eb;
  padding-bottom: 8px;
  display: inline-block;
}

.footer-section p {
  color: #9ca3af;
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 20px;
}

.app-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.app-link {
  display: inline-block;
  background: #2563eb;
  color: white !important;
  padding: 12px 20px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  transition: all 0.2s ease;
  text-align: center;
  min-width: 200px;
}

.app-link:hover {
  background: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.footer-bottom p {
  color: #9ca3af;
  font-size: 14px;
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 30px;
}

.footer-links a {
  color: #9ca3af;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #2563eb;
}

img.screenshot {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
  margin: 40px auto 0 auto;
  display: block;
}

#avantages ul {
  list-style: none;
  padding: 0;
  max-width: 700px;
  margin: 0 auto;
}

#avantages li {
  padding: 16px 0;
  font-size: 16px;
  color: #374151;
  font-weight: 500;
}

/* Responsive design */
@media (max-width: 768px) {
  .contact-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .contact-form {
    padding: 30px 20px;
  }
  
  .tutorial-content {
    margin-top: 40px;
  }
  
  .tutorial-intro {
    margin-bottom: 30px;
  }
  
  .video-container {
    max-width: 100%;
    margin: 0 auto;
  }
  
  .footer-content {
    text-align: center;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    justify-content: center;
  }
  
  .app-links {
    align-items: center;
  }
  
  nav {
    flex-direction: column;
    gap: 20px;
    padding: 20px;
  }
  
  .nav-links {
    flex-wrap: wrap;
    gap: 10px;
  }
  
  .header-actions {
    flex-direction: column;
    gap: 15px;
  }
  
  .header-actions .app-links {
    flex-direction: column;
    gap: 6px;
  }
  
  .header-actions .app-link {
    font-size: 12px;
    padding: 8px 14px;
  }
  
  header h1 {
    font-size: 2.5em;
  }
  
  section {
    padding: 60px 20px;
  }
}