/* Modern CSS Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Root Variables */
:root {
  --primary-color: #667eea;
  --primary-dark: #5a67d8;
  --secondary-color: #764ba2;
  --success-color: #48bb78;
  --danger-color: #f56565;
  --warning-color: #ed8936;
  --bg-color: #f7fafc;
  --card-bg: #ffffff;
  --text-primary: #2d3748;
  --text-secondary: #718096;
  --border-color: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1a202c;
    --card-bg: #2d3748;
    --text-primary: #f7fafc;
    --text-secondary: #a0aec0;
    --border-color: #4a5568;
  }
}

/* Base Styles */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  padding: var(--spacing-md);
}

/* Container */
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* Card */
.card {
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Header */
.header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Form Elements */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-row {
  margin-bottom: var(--spacing-md);
}

label {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
}

input, textarea, select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: inherit;
  background: var(--card-bg);
  color: var(--text-primary);
  transition: all 0.2s ease;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

/* Inline form elements */
.form-inline {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.form-inline .form-group {
  flex: 1;
  min-width: 200px;
  margin-bottom: var(--spacing-md);
}

/* File input */
.file-input {
  position: relative;
  display: inline-block;
  width: 100%;
}

.file-input input[type="file"] {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.file-input-label {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 16px;
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius);
  background: rgba(102, 126, 234, 0.05);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.file-input-label:hover {
  border-color: var(--primary-color);
  background: rgba(102, 126, 234, 0.1);
}

.file-input-label::before {
  content: "📎";
  margin-right: var(--spacing-sm);
  font-size: 1.2em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-full {
  width: 100%;
}

.btn-large {
  padding: 16px 32px;
  font-size: 1.125rem;
}

/* Output */
.output {
  background: rgba(72, 187, 120, 0.1);
  border: 2px solid var(--success-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin-top: var(--spacing-lg);
  word-break: break-word;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 0.875rem;
  line-height: 1.4;
}

.output.error {
  background: rgba(245, 101, 101, 0.1);
  border-color: var(--danger-color);
}

.output.empty {
  display: none;
}

/* Markdown formatting in output */
.output h1, .output h2, .output h3 {
  font-weight: 600;
  margin-top: 1em;
  margin-bottom: 0.5em;
}

.output h1 { font-size: 1.5em; }
.output h2 { font-size: 1.3em; }
.output h3 { font-size: 1.1em; }

.output p {
  margin-bottom: 0.75em;
}

.output ul, .output ol {
  margin: 0.5em 0 0.5em 1.5em;
}

.output li {
  margin-bottom: 0.25em;
}

.output code {
  background: rgba(0, 0, 0, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9em;
}

.output a {
  color: var(--primary-color);
  text-decoration: underline;
}

.output a:hover {
  color: var(--primary-dark);
}

/* Warning/Info boxes */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  font-size: 0.875rem;
}

.alert-info {
  background: rgba(102, 126, 234, 0.1);
  border: 1px solid rgba(102, 126, 234, 0.3);
  color: var(--primary-dark);
}

.alert-warning {
  background: rgba(237, 137, 54, 0.1);
  border: 1px solid rgba(237, 137, 54, 0.3);
  color: #c05621;
}

/* Loading state */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.btn.loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  margin: auto;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Mobile Responsive */
@media (max-width: 768px) {
  body {
    padding: var(--spacing-sm);
  }
  
  .container {
    padding: var(--spacing-md);
  }
  
  .card {
    padding: var(--spacing-lg);
  }
  
  .header h1 {
    font-size: 1.5rem;
  }
  
  .form-inline {
    flex-direction: column;
  }
  
  .form-inline .form-group {
    min-width: auto;
  }
  
  .btn {
    padding: 14px 20px;
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 1.25rem;
  }
  
  .btn {
    padding: 12px 16px;
    font-size: 0.875rem;
  }
}

/* Output Success Styles */
.output-success-header {
  text-align: center; 
  margin-bottom: 16px;
  font-weight: 600;
}

.output-url-container {
  background: rgba(0,0,0,0.05); 
  padding: 12px; 
  border-radius: 6px; 
  margin: 12px 0;
}

.output-url-label {
  font-weight: 600;
  margin-bottom: 4px;
}

.output-url-link {
  color: var(--primary-color); 
  word-break: break-all; 
  font-size: 1.1em; 
  font-weight: 600;
  text-decoration: none;
}

.output-url-link:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.output-copy-container {
  text-align: center; 
  margin-top: 16px;
}

.output-copy-btn {
  background: var(--success-color); 
  color: white; 
  border: none; 
  padding: 8px 16px; 
  border-radius: 6px; 
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.output-copy-btn:hover {
  background: #38a169;
  transform: translateY(-1px);
}

.output-warning {
  margin-top: 12px; 
  font-size: 0.875rem; 
  color: var(--text-secondary);
}

.btn-success {
  background: linear-gradient(135deg, var(--success-color), #38a169) !important;
}

.btn-error {
  background: linear-gradient(135deg, var(--danger-color), #e53e3e) !important;
}

/* Shortcode Loading/Error States */
.shortcode-container {
  text-align: center; 
  padding: 50px; 
  font-family: Arial, sans-serif;
}

.shortcode-container h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.shortcode-container p {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.shortcode-container a {
  color: var(--primary-color); 
  text-decoration: none;
  font-weight: 500;
}

.shortcode-container a:hover {
  text-decoration: underline;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-small { font-size: 0.875rem; }
.text-muted { color: var(--text-secondary); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }