body {
  font-family: Arial, sans-serif;
  background-color: #1b1f24;
  color: #e2e8f0;
  margin: 0;
  padding: 0;
}

header {
  background: linear-gradient(135deg, #2d3748 0%, #1a202c 50%, #2d1f1f 100%);
  text-align: center;
  padding: 3rem 1.5rem;
  border-bottom: 3px solid rgba(246, 173, 85, 0.3);
}

header picture {
  display: block;
  margin: 0 auto 1.5rem auto;
}

header img {
  max-width: 180px;
  display: block;
  margin: 0 auto;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  transition: transform 0.3s ease;
}

header img:hover {
  transform: scale(1.05);
}

header h1 {
  margin: 0 0 0.75rem 0;
  font-size: 2.2rem;
  color: #f6ad55;
  line-height: 1.3;
}

header .tagline {
  font-size: 1.1rem;
  color: #cbd5e0;
  font-weight: normal;
  margin: 0;
  font-style: italic;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

section {
  margin-bottom: 2rem;
}

h2 {
  color: #63b3ed;
  border-bottom: 2px solid #4a5568;
  padding-bottom: 0.3rem;
}

p {
  line-height: 1.6;
}

ul {
  line-height: 1.8;
  padding-left: 1.2rem;
}

a {
  color: #90cdf4;
  text-decoration: none;
}

a:hover {
  color: #63b3ed;
}

footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.9rem;
  color: #a0aec0;
}

.nav {
  background: linear-gradient(180deg, #2d3748 0%, rgba(45, 55, 72, 0.95) 100%);
  padding: 1rem;
  text-align: center;
  font-size: 0.85rem;
  border-bottom: 1px solid #4a5568;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.nav a {
  color: #90cdf4;
  text-decoration: none;
  margin: 0 0.5rem;
  padding: 0.5rem 0.75rem;
  transition: all 0.2s;
  display: inline-block;
  white-space: nowrap;
}

.nav a:hover {
  color: #63b3ed;
  background-color: rgba(99, 179, 237, 0.1);
  border-radius: 4px;
}

.nav a.active {
  color: #f6ad55;
  font-weight: bold;
}

.callout {
  background-color: #2d3748;
  border-left: 4px solid #f6ad55;
  padding: 1rem;
  margin: 1rem 0;
}

.step {
  background-color: #374151;
  padding: 1rem;
  margin: 1rem 0;
  border-radius: 4px;
}

.step-number {
  color: #fbbf24;
  font-weight: bold;
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.radio-comparison {
  background-color: #2d3748;
  border: 2px solid #4a5568;
  padding: 1.5rem;
  margin: 1.5rem 0;
  border-radius: 6px;
}

.radio-comparison h3 {
  color: #f6ad55;
  margin-top: 0;
  font-size: 1.3rem;
  text-align: center;
  border-bottom: 2px solid #4a5568;
  padding-bottom: 0.5rem;
}

.radio-tier {
  background-color: #374151;
  padding: 1rem;
  margin: 0.75rem 0;
  border-radius: 4px;
  border-left: 4px solid #63b3ed;
}

.radio-tier.minimum {
  border-left-color: #fbbf24;
}

.radio-tier.ideal {
  border-left-color: #48bb78;
}

.radio-tier strong {
  color: #90cdf4;
  font-size: 1.1rem;
}

.license-table {
  background-color: #2d3748;
  border: 2px solid #4a5568;
  padding: 1.5rem;
  margin: 1.5rem 0;
  border-radius: 6px;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

th {
  background-color: #374151;
  color: #f6ad55;
  padding: 0.75rem;
  text-align: left;
  font-weight: bold;
  border-bottom: 2px solid #4a5568;
}

td {
  padding: 0.75rem;
  border-bottom: 1px solid #4a5568;
}

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

.highlight {
  background-color: #374151;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  color: #fbbf24;
}

.project-link {
  display: block;
  background-color: #2d3748;
  border: 1px solid #4a5568;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 0.75rem 0;
  text-decoration: none;
  color: inherit;
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease,
    transform 0.15s ease,
    background-color 0.15s ease;
}

.project-link strong {
  display: block;
  color: #f6ad55;
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.project-link p {
  margin: 0;
  font-size: 0.95rem;
  color: #cbd5e0;
}

.project-link:hover,
.project-link:focus-visible {
  background-color: #1f2933;
  border-color: #63b3ed;
  box-shadow: 0 0 0 1px rgba(99, 179, 237, 0.5);
  transform: translateY(-1px);
  outline: none;
}

.hero {
  background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
  text-align: center;
  padding: 3rem 1rem;
  margin: 0 0 2rem 0;
  border-bottom: 2px solid #4a5568;
}

.hero h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  border: none;
  color: #f6ad55;
}

.hero p {
  font-size: 1.1rem;
  color: #cbd5e0;
  max-width: 600px;
  margin: 0 auto;
}

.quick-start {
  background-color: #2d3748;
  border-left: 4px solid #48bb78;
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 4px;
}

.quick-start strong {
  display: block;
  color: #48bb78;
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.quick-start ol {
  margin: 0.5rem 0 0 1.2rem;
  line-height: 2;
}

.quick-start a {
  font-weight: bold;
}

.section-group {
  margin-bottom: 3rem;
}

.hardware-card {
  display: block;
  background-color: #2d3748;
  border: 1px solid #4a5568;
  border-radius: 6px;
  padding: 1rem;
  margin: 0.75rem 0;
  text-decoration: none;
  color: inherit;
  transition: all 0.15s ease;
}

.hardware-card:hover {
  background-color: #374151;
  border-color: #63b3ed;
  transform: translateY(-2px);
}

.hardware-card strong {
  display: block;
  color: #90cdf4;
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.hardware-card p {
  margin: 0;
  font-size: 0.9rem;
  color: #cbd5e0;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 3px;
  font-size: 0.75rem;
  font-weight: bold;
  margin-right: 0.5rem;
  vertical-align: middle;
}

.badge-license {
  background-color: #48bb78;
  color: #0a0e1a;
}

.badge-optional {
  background-color: #4a5568;
  color: #e2e8f0;
}

.breadcrumb {
  font-size: 0.85rem;
  color: #a0aec0;
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: #90cdf4;
}

.device-card {
  background-color: #2d3748;
  border: 2px solid #4a5568;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.device-card h3 {
  color: #f6ad55;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.device-card > p:first-of-type {
  color: #90cdf4;
  font-weight: bold;
  margin-bottom: 1rem;
}

.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1rem 0;
}

.pros, .cons {
  background-color: #374151;
  padding: 1rem;
  border-radius: 6px;
}

.pros {
  border-left: 4px solid #48bb78;
}

.cons {
  border-left: 4px solid #f6ad55;
}

.pros strong, .cons strong {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.pros strong {
  color: #48bb78;
}

.cons strong {
  color: #f6ad55;
}

.pros-cons ul {
  margin: 0;
  padding-left: 1.2rem;
  line-height: 1.6;
}

.pros-cons li {
  margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
  .hero {
    padding: 2rem 1rem;
  }
  
  .hero h2 {
    font-size: 1.4rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .nav {
    font-size: 0.7rem;
    gap: 0.25rem;
  }
  
  .nav a {
    margin: 0 0.25rem;
    padding: 0.4rem 0.4rem;
  }
  
  .pros-cons {
    grid-template-columns: 1fr;
  }
}

    .contact-form {
      max-width: 600px;
      margin: 2em auto;
    }
    .form-group {
      margin-bottom: 1.5em;
    }
    .form-group label {
      display: block;
      font-weight: bold;
      margin-bottom: 0.5em;
      color: #e63946;
    }
    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 0.75em;
      border: 2px solid #333;
      background: #1a1a1a;
      color: #f1faee;
      font-family: 'Courier New', monospace;
      font-size: 1em;
      box-sizing: border-box;
    }
    .form-group input:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: #e63946;
    }
    .form-group textarea {
      min-height: 150px;
      resize: vertical;
    }
    .form-group input::placeholder,
    .form-group textarea::placeholder {
      color: #666;
    }
    .captcha-container {
      margin: 1.5em 0;
      display: flex;
      justify-content: center;
    }
    .submit-btn {
      background: #e63946;
      color: #f1faee;
      border: none;
      padding: 1em 2em;
      font-size: 1.1em;
      font-weight: bold;
      cursor: pointer;
      font-family: 'Courier New', monospace;
      text-transform: uppercase;
      letter-spacing: 1px;
      transition: background 0.3s;
    }
    .submit-btn:hover {
      background: #d62828;
    }
    .submit-btn:disabled {
      background: #666;
      cursor: not-allowed;
    }
    .message {
      padding: 1em;
      margin: 1em 0;
      border-radius: 4px;
      text-align: center;
      font-weight: bold;
    }
    .message.success {
      background: rgba(76, 175, 80, 0.2);
      border: 2px solid #4caf50;
      color: #4caf50;
    }
    .message.error {
      background: rgba(230, 57, 70, 0.2);
      border: 2px solid #e63946;
      color: #e63946;
    }
    .required {
      color: #e63946;
    }