:root {
  --primary-color: #4A90E2;
  --primary-light: #6BA5E9;
  --primary-dark: #2E6FC1;
  --secondary-color: #E25749;
  --secondary-light: #E87567;
  --secondary-dark: #C43B2E;
  --accent-color: #FFD166;
  --success-color: #4CAF50;
  --warning-color: #FF9800;
  --error-color: #F44336;
  --neutral-100: #F8FAFC;
  --neutral-200: #E2E8F0;
  --neutral-300: #CBD5E1;
  --neutral-400: #94A3B8;
  --neutral-500: #64748B;
  --neutral-600: #475569;
  --neutral-700: #334155;
  --neutral-800: #1E293B;
  --neutral-900: #0F172A;
  --background-color: #FFFFFF;
  --text-color: var(--neutral-900);
  --border-radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 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);
  --animation-duration: 0.3s;
  --add-color: #E3F2FD;
  --add-border: #BBDEFB;
  --delete-color: #FFEBEE;
  --delete-border: #FFCDD2;
  --panel-height: 400px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* body {
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.5;
  font-weight: 400;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
} */

headers {
  text-align: center;
  padding: 24px 16px;
  background-color: var(--background-color);
  border-bottom: 1px solid var(--neutral-200);
}

headers h1 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--neutral-900);
}

headers p {
  font-size: 1rem;
  color: var(--neutral-600);
}

main {
  flex-grow: 1;
  padding: 24px 16px;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

.container {
  width: 100%;
  animation: fadeIn var(--animation-duration) ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.text-panels {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 24px;
}

.panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--neutral-300);
  border-radius: var(--border-radius);
  overflow: hidden;
  background-color: var(--background-color);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--animation-duration) ease;
}

.panel:hover {
  box-shadow: var(--shadow-md);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background-color: var(--neutral-100);
  border-bottom: 1px solid var(--neutral-200);
}

.panel-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--neutral-800);
}

.stats {
  display: flex;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--neutral-600);
}

.panel-content {
  height: var(--panel-height);
  overflow-y: auto;
}

textarea {
  width: 100%;
  height: 100%;
  padding: 16px;
  border: none;
  outline: none;
  resize: none;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-color);
  background-color: var(--background-color);
}

.panel-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--neutral-200);
  display: flex;
  justify-content: flex-start;
}

.action-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

button {
  padding: 10px 16px;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--animation-duration) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.primary-btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
}

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

.secondary-btn {
  background-color: white;
  color: var(--neutral-800);
  border: 1px solid var(--neutral-300);
}

.secondary-btn:hover {
  background-color: var(--neutral-100);
  border-color: var(--neutral-400);
}

.file-btn {
  background-color: white;
  color: var(--neutral-700);
  border: 1px solid var(--neutral-300);
  padding: 6px 12px;
  font-size: 0.875rem;
}

.file-btn:hover {
  background-color: var(--neutral-100);
  border-color: var(--neutral-400);
}

.icon-btn {
  background: none;
  border: none;
  padding: 4px;
  color: var(--neutral-600);
  border-radius: 4px;
}

.icon-btn:hover {
  background-color: var(--neutral-200);
  color: var(--neutral-800);
}

.panel-actions {
  display: flex;
  gap: 8px;
}

.diff-content {
  padding: 16px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: monospace;
  line-height: 1.5;
  height: var(--panel-height);
  overflow-y: auto;
  color: black;
}

.diff-content .line {
  display: block;
  width: 100%;
  padding: 2px 4px;
  border-radius: 2px;
  margin-bottom: 2px;
}

.diff-content .added {
  background-color: var(--add-color);
  border-left: 3px solid var(--primary-color);
}

.diff-content .deleted {
  background-color: var(--delete-color);
  border-left: 3px solid var(--secondary-color);
}

footers {
  text-align: center;
  padding: 16px;
  margin-top: auto;
  background-color: var(--neutral-100);
  border-top: 1px solid var(--neutral-200);
}

footers p {
  color: var(--neutral-600);
  font-size: 0.875rem;
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--neutral-800);
  color: white;
  padding: 12px 24px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 1000;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

#result-container .panel-content {
  overflow-y: auto;
}