:root {
  --gap: 1rem;
  --primary-color: #4a6ee0;
  --primary-hover: #3a5ed0;
  --danger-color: #e74c3c;
  --danger-hover: #c0392b;
  --success-color: #2ecc71;
  --success-hover: #27ae60;
  --warning-color: #f39c12;
  --warning-hover: #e67e22;
  --border-color: #ddd;
  --bg-light: #f8f9fa;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

body {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  max-width: 1200px;
  margin: 0 auto;
}

h1 {
  color: #333;
  margin: 0;
  font-weight: 600;
}

.description {
  color: #666;
  margin: 0;
  font-size: 1rem;
  line-height: 1.5;
}

.presets {
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: 8px;
}

.rules-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.rules-title {
  font-weight: 600;
  color: #444;
  margin: 0;
}

.rules {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  margin-bottom: .75rem;
}

.rule {
  display: flex;
  gap: .75rem;
  align-items: center;
  padding: 0.75rem;
  background: white;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
}

.rule.drag-over {
  border: 2px dashed var(--primary-color);
  background-color: #f0f4ff;
}

.drag-handle {
  cursor: grab;
  color: #999;
  padding: 0.5rem;
  border-radius: 4px;
  transition: all 0.2s;
  user-select: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.drag-handle:hover {
  background-color: #f0f0f0;
  color: #666;
}

.drag-handle:active {
  cursor: grabbing;
}

.drag-handle::before {
  content: "⋮⋮";
  font-size: 1.2rem;
  line-height: 1;
  letter-spacing: -2px;
}

.rule.dragging {
  opacity: 0.5;
}

.rule-content {
  display: flex;
  gap: .75rem;
  align-items: center;
  flex: 1;
}

.rule input[type="text"] {
  padding: .5rem;
  font-size: .95rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  flex: 1;
}

.rule-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.rule button {
  padding: .5rem .75rem;
  background-color: var(--danger-color);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.rule button:hover {
  background-color: var(--danger-hover);
}

.controls {
  display: flex;
  gap: .75rem;
  align-items: center;
  margin-top: .75rem;
  flex-wrap: wrap;
}

.main-controls {
  display: flex;
  gap: .75rem;
  align-items: center;
}

.import-export {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-left: auto;
}

label.small {
  font-size: .85rem;
  display:flex;
  gap:.5rem;
  align-items:center;
  white-space: nowrap;
}

.text-areas {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  align-items: start;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-title {
  font-weight: 600;
  color: #444;
  margin: 0;
}

textarea {
  width: 100%;
  height: 50vh;
  font-size: 1rem;
  padding: .75rem;
  box-sizing: border-box;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: inherit;
}

#source {
  resize: none; /* Input textarea is not resizable */
}

#output {
  resize: vertical; /* Output textarea is resizable vertically */
}

.output-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
  height: 50vh;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.output {
  width: 100%;
  flex: 1;
  padding: .75rem;
  border: 1px solid var(--border-color);
  white-space: pre-wrap;
  overflow: auto;
  box-sizing: border-box;
  border-radius: 6px;
  background-color: #fff;
  font-family: inherit;
  min-height: 0;
}

.copy-btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 4px;
  padding: 0.5rem 1.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.2s;
}

.copy-btn:hover {
  background-color: var(--primary-hover);
}

.copy-btn:active {
  transform: translateY(1px);
}

.copy-btn.copied {
  background-color: var(--success-color);
}

.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.2s;
}

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

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

.btn-secondary {
  background-color: #6c757d;
  color: white;
}

.btn-secondary:hover {
  background-color: #5a6268;
}

.btn-warning {
  background-color: var(--warning-color);
  color: white;
}

.btn-warning:hover {
  background-color: var(--warning-hover);
}

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

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

.file-input {
  display: none;
}

.file-label {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: var(--warning-color);
  color: white;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
  font-size: 0.9rem;
}

.file-label:hover {
  background-color: var(--warning-hover);
}

.status {
  font-size: 0.85rem;
  color: #666;
  margin-left: auto;
}

.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.3s, transform 0.3s;
  z-index: 1000;
}

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

.notification.error {
  background-color: var(--danger-color);
}

.notification.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 768px) {
  body {
    padding: 1rem;
  }

  .text-areas {
    grid-template-columns: 1fr;
  }

  .rule {
    flex-direction: column;
    align-items: stretch;
  }

  .rule-content {
    flex-direction: column;
  }

  .rule input[type="text"] {
    min-width: auto;
  }

  .controls {
    flex-direction: column;
    align-items: flex-start;
  }

  .import-export {
    margin-left: 0;
    width: 100%;
    justify-content: flex-start;
  }

  .status {
    margin-left: 0;
    margin-top: 0.5rem;
  }
}