* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: #f8f9ff; color: #333; line-height: 1.6; }
.container { max-width: 800px; margin: 0 auto; padding: 20px; }
header { text-align: center; margin-bottom: 30px; }
h1 { color: #4a5568; font-size: 1.8em; margin-bottom: 5px; }
.subtitle { color: #718096; font-size: 0.95em; }
.input-group { margin-bottom: 20px; }
label { display: block; font-weight: 600; margin-bottom: 8px; color: #4a5568; }
.regex-row { display: flex; align-items: center; gap: 8px; }
.slash { color: #a0aec0; font-size: 1.2em; }
input[type="text"], textarea { width: 100%; padding: 10px 14px; border: 1px solid #e2e8f0; border-radius: 8px; font-size: 14px; }
.flags-input { max-width: 60px; }
textarea { resize: vertical; }
.button-row { display: flex; gap: 10px; margin-bottom: 20px; }
.primary-btn { background: #667eea; color: white; border: none; padding: 10px 24px; border-radius: 8px; cursor: pointer; }
.secondary-btn { background: #48bb78; color: white; border: none; padding: 10px 24px; border-radius: 8px; cursor: pointer; }
.text-btn { background: none; color: #718096; border: 1px solid #e2e8f0; padding: 10px 20px; border-radius: 8px; cursor: pointer; }
.result-section { background: white; padding: 20px; border-radius: 12px; border: 1px solid #e2e8f0; }
.match-count { font-weight: 600; color: #667eea; margin-bottom: 10px; }
.match-tag { display: inline-block; background: #edf2f7; padding: 4px 10px; border-radius: 6px; margin: 4px; font-size: 13px; }
.replace-result { background: #f7fafc; padding: 12px; border-radius: 8px; margin-top: 8px; font-family: monospace; }
.disclaimer { margin-top: 20px; padding: 12px; background: #fffbeb; border-radius: 8px; font-size: 13px; color: #92400e; }