/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 40px;
  padding: 40px 0;
  background: rgb(255 255 255 / 10%);
  border-radius: 15px;
  backdrop-filter: blur(10px);
}

header h1 {
  color: white;
  font-size: 2.5em;
  margin-bottom: 10px;
  font-weight: 700;
}

header p {
  color: rgb(255 255 255 / 90%);
  font-size: 1.2em;
}

/* Main content */
main {
  background: white;
  border-radius: 15px;
  padding: 40px;
  box-shadow: 0 20px 40px rgb(0 0 0 / 10%);
  margin-bottom: 20px;
}

/* Form styles */
.form-section {
  margin-bottom: 30px;
}

/* URL Section at top */
.url-section {
  background: #f8f9fa;
  padding: 25px;
  border-radius: 12px;
  border: 2px solid #e9ecef;
  margin-bottom: 30px;
}

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

.output-group {
  margin-top: 20px;
}

.input-group label,
.output-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #555;
}

.input-group input[type="url"],
.output-group input[type="text"] {
  width: 70%;
  padding: 12px 15px;
  border: 2px solid #e1e5e9;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

.output-group input[type="text"] {
  background: #f8f9fa;
}

.input-group input[type="url"]:focus,
.output-group input[type="text"]:focus {
  outline: none;
  border-color: #667eea;
}

.input-group button,
.output-group button {
  width: 25%;
  margin-left: 10px;
  padding: 12px 20px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.output-group button {
  background: #28a745;
}

.input-group button:hover,
.output-group button:hover {
  background: #5a6fd8;
}

.output-group button:hover {
  background: #218838;
}

/* Options grid */
.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}

.option-group {
  background: #f8f9fa;
  padding: 25px;
  border-radius: 12px;
  border: 1px solid #e9ecef;
}

.option-group h3 {
  margin-bottom: 20px;
  color: #495057;
  font-size: 1.2em;
  border-bottom: 2px solid #667eea;
  padding-bottom: 8px;
}

.option-group label {
  display: block;
  margin-bottom: 15px;
  cursor: pointer;
  font-weight: 500;
}

.option-group input[type="checkbox"] {
  margin-right: 10px;
  transform: scale(1.2);
}

.option-group input[type="number"],
.option-group select {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid #e1e5e9;
  border-radius: 6px;
  font-size: 14px;
  margin-top: 5px;
  transition: border-color 0.3s ease;
}

.option-group input[type="number"]:focus,
.option-group select:focus {
  outline: none;
  border-color: #667eea;
}

.option-group small {
  display: block;
  color: #6c757d;
  font-size: 0.85em;
  margin-top: 5px;
}

/* Preview section */
.preview-section {
  margin-top: 40px;
  padding-top: 30px;
  border-top: 2px solid #e9ecef;
}

.preview-section h3 {
  margin-bottom: 15px;
  color: #495057;
}

.preview-container {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  border: 2px solid #e9ecef;
  text-align: center;
}

.preview-container iframe {
  max-width: 100%;
  border-radius: 8px;
}

/* Footer */
footer {
  text-align: center;
  padding: 20px;
  color: rgb(255 255 255 / 80%);
}

/* Responsive design */
@media (width <= 768px) {
  .container {
    padding: 10px;
  }

  header h1 {
    font-size: 2em;
  }

  main {
    padding: 20px;
  }

  .input-group input[type="url"],
  .output-group input[type="text"] {
    width: 100%;
    margin-bottom: 10px;
  }

  .input-group button,
  .output-group button {
    width: 100%;
    margin-left: 0;
  }

  .options-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* Success/Error messages */
.message {
  padding: 12px 15px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-weight: 500;
}

.message.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.message.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}