:root {
   --primary-color: #2563eb;
   --secondary-color: #4f46e5;
   --accent-color: #ec4899;
   --light-color: #f8fafc;
   --dark-color: #1e293b;
   --border-color: #e2e8f0;
   --success-color: #10b981;
   --border-radius: 8px;
}

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

/* body {
   font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
   line-height: 1.6;
   color: var(--dark-color);
   background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
   min-height: 100vh;
   padding: 20px;
} */

.container {
   max-width: 1200px;
   margin: 0 auto;
   background: white;
   border-radius: var(--border-radius);
   box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
   overflow: hidden;
}

.main-content {
   padding: 20px 200px;
}

.section-title {
   font-size: 1.5rem;
   font-weight: 700;
   color: var(--dark-color);
   margin-bottom: 25px;
   padding-bottom: 15px;
   border-bottom: 2px solid var(--border-color);
}

.input-group {
   margin-bottom: 25px;
}

.input-group label {
   display: block;
   margin-bottom: 8px;
   font-weight: 600;
   color: var(--dark-color);
   font-size: 0.95rem;
}

.input-group small {
   display: block;
   margin-top: 4px;
   color: #64748b;
   font-size: 0.85rem;
}

textarea, input, select {
   width: 100%;
   padding: 12px 16px;
   border: 2px solid var(--border-color);
   border-radius: var(--border-radius);
   font-size: 14px;
   transition: all 0.3s ease;
   background: var(--light-color);
   font-family: inherit;
}

textarea {
   min-height: 120px;
   resize: vertical;
   line-height: 1.5;
}

textarea:focus, input:focus, select:focus {
   outline: none;
   border-color: var(--primary-color);
   box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
   background: white;
}

.options-grid {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
   gap: 20px;
   margin-bottom: 25px;
}

.word-lists, .advanced-options, .prefix-suffix {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: 25px;
   margin-bottom: 25px;
}

.option-item {
   display: flex;
   align-items: center;
   gap: 12px;
   margin-bottom: 15px;
}

.option-item input[type="checkbox"] {
   width: 18px;
   height: 18px;
   accent-color: var(--primary-color);
}

.option-item label {
   font-weight: 500;
   font-size: 0.95rem;
   margin: 0;
   cursor: pointer;
}

.button-group {
   display: flex;
   gap: 15px;
   margin: 30px 0;
   flex-wrap: wrap;
}

button {
   background: var(--primary-color);
   color: white;
   border: none;
   padding: 14px 28px;
   border-radius: var(--border-radius);
   cursor: pointer;
   font-size: 16px;
   font-weight: 600;
   transition: all 0.3s ease;
   display: inline-flex;
   align-items: center;
   gap: 8px;
}

button:hover {
   background: var(--secondary-color);
   transform: translateY(-2px);
   box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

button:active {
   transform: translateY(0);
}

button.secondary {
   background: #64748b;
}

button.secondary:hover {
   background: #475569;
}

button.success {
   background: var(--success-color);
}

button.success:hover {
   background: #059669;
}

.output-section {
   margin-top: 30px;
   border-top: 2px solid var(--border-color);
   padding-top: 30px;
}

.output-header {
   display: flex;
   justify-content: space-between;
   align-items: center;
   margin-bottom: 20px;
   flex-wrap: wrap;
   gap: 15px;
}

.output-header h2 {
   font-size: 1.5rem;
   font-weight: 700;
   color: var(--dark-color);
}

.stats {
   color: #64748b;
   font-size: 0.95rem;
   font-weight: 500;
}

.controls {
   display: flex;
   justify-content: space-between;
   align-items: center;
   margin-bottom: 20px;
   flex-wrap: wrap;
   gap: 15px;
}

.pagination {
   display: flex;
   gap: 10px;
   align-items: center;
}

.pagination button {
   padding: 10px 20px;
   font-size: 14px;
}

.column-controls {
   display: flex;
   align-items: center;
   gap: 15px;
   background: var(--light-color);
   padding: 12px 20px;
   border-radius: var(--border-radius);
   border: 2px solid var(--border-color);
}

.column-controls label {
   font-weight: 600;
   font-size: 0.9rem;
   color: var(--dark-color);
   white-space: nowrap;
}

.column-buttons {
   display: flex;
   gap: 8px;
}

.column-btn {
   padding: 8px 16px;
   border: 2px solid var(--border-color);
   background: white;
   color: var(--dark-color);
   border-radius: 6px;
   cursor: pointer;
   font-weight: 600;
   font-size: 0.9rem;
   transition: all 0.3s ease;
}

.column-btn:hover {
   border-color: var(--primary-color);
   background: var(--light-color);
}

.column-btn.active {
   background: var(--primary-color);
   color: white;
   border-color: var(--primary-color);
}

#output {
   min-height: 200px;
   max-height: 400px;
   overflow-y: auto;
   border: 2px solid var(--border-color);
   border-radius: var(--border-radius);
   padding: 20px;
   background: var(--light-color);
   transition: all 0.3s ease;
}

/* Column Layouts */
.output-columns-1 {
   display: grid;
   grid-template-columns: 1fr;
   gap: 12px;
}

.output-columns-2 {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
   gap: 12px;
}

.output-columns-3 {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
   gap: 12px;
}

.output-columns-4 {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
   gap: 12px;
}

.domain-name {
   padding: 12px 16px;
   background: white;
   border-radius: 6px;
   border-left: 4px solid var(--primary-color);
   font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
   font-size: 13px;
   font-weight: 500;
   transition: all 0.3s ease;
   cursor: pointer;
   border: 1px solid var(--border-color);
   word-break: break-word;
}

.domain-name:hover {
   background: #f1f5f9;
   transform: translateY(-2px);
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
   border-left-color: var(--secondary-color);
}

.empty-state {
   grid-column: 1 / -1;
   text-align: center;
   padding: 60px 20px;
   color: #64748b;
}

.empty-state h3 {
   font-size: 1.2rem;
   margin-bottom: 10px;
   color: #475569;
}

@media (max-width: 768px) {
   .main-content {
       padding: 25px;
   }
   
   .options-grid {
       grid-template-columns: 1fr;
   }
   
   .word-lists, .advanced-options, .prefix-suffix {
       grid-template-columns: 1fr;
   }
   
   .button-group {
       flex-direction: column;
   }
   
   .button-group button {
       width: 100%;
       justify-content: center;
   }
   
   .controls {
       flex-direction: column;
       align-items: stretch;
   }
   
   .pagination {
       justify-content: center;
   }
   
   .column-controls {
       flex-direction: column;
       align-items: stretch;
   }
   
   .column-buttons {
       justify-content: center;
   }
   
   .output-columns-1,
   .output-columns-2,
   .output-columns-3,
   .output-columns-4 {
       grid-template-columns: 1fr;
   }
}

@media (max-width: 480px) {
   body {
       padding: 10px;
   }
   
   .main-content {
       padding: 20px;
   }
}