*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --primary: #4f46e5;
  --primary-light: #6366f1;
  --primary-dark: #4338ca;
  --secondary: #10b981;
  --secondary-dark: #059669;
  --background: #f9fafb;
  --container-bg: #ffffff;
  --text: #1f2937;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --border-focus: #a5b4fc;
  --error: #ef4444;
  --error-light: #fee2e2;

  --font-main: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-code: 'Fira Code', 'JetBrains Mono', monospace;

  --shadow-sm: 0 1px 2px 0 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);
  --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  margin: 0;
  padding: 0;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  background-image: linear-gradient(135deg, #f3f4f6 0%, #fff 100%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  line-height: 1.25;
  color: var(--text);
  font-weight: 700;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(to right, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  position: relative;
  padding: var(--spacing-xl) 0;
}

header:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 10%;
  height: 4px;
  background: linear-gradient(to right, var(--primary), var(--secondary));
  border-radius: var(--radius-full);
}

.description {
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  font-size: 1.125rem;
}

.input-section {
  background-color: var(--container-bg);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-2xl);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  border: 1px solid var(--border);
}

.input-section:hover {
  box-shadow: var(--shadow-lg);
}

textarea {
  width: 100%;
  min-height: 150px;
  padding: var(--spacing-lg);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 1rem;
  margin-bottom: var(--spacing-lg);
  resize: vertical;
  color: var(--text);
  background-color: #f9fafb;
  transition: border var(--transition-fast), box-shadow var(--transition-fast);
}

textarea:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

textarea::placeholder {
  color: var(--text-light);
  opacity: 0.7;
}

.button-container {
  display: flex;
  justify-content: center;
}

button {
  background: linear-gradient(to right, var(--primary), var(--primary-light));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  min-width: 160px;
}

button:hover {
  box-shadow: var(--shadow-md);
  background: linear-gradient(to right, var(--primary-dark), var(--primary));
}

button:disabled {
  background: #cbd5e1;
  cursor: not-allowed;
  box-shadow: var(--shadow-sm);
  opacity: 0.7;
}

button svg {
  width: 20px;
  height: 20px;
}

.loader {
  display: none;
  text-align: center;
  margin: var(--spacing-2xl) 0;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  background-color: var(--container-bg);
  box-shadow: var(--shadow-md);
}

.spinner {
  display: inline-block;
  width: 50px;
  height: 50px;
  border: 4px solid rgba(79, 70, 229, 0.2);
  border-radius: 50%;
  border-top-color: var(--primary);
  animation: spin 1s infinite ease-in-out;
  margin-bottom: var(--spacing-md);
}

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

.loader p {
  color: var(--text);
  font-weight: 500;
  margin: 0;
}

.output-section {
  display: none;
  background-color: var(--container-bg);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  animation: fadeIn 0.5s ease;
  margin-top: var(--spacing-xl);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.tabs {
  display: flex;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
  gap: var(--spacing-sm);
  position: relative;
}

.tab {
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  color: var(--text-light);
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.tab:hover {
  color: var(--primary);
  background-color: rgba(79, 70, 229, 0.05);
}

.tab.active {
  color: var(--primary);
  font-weight: 600;
}

.tab.active::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
  border-radius: var(--radius-full);
}

.content {
  display: none;
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  background-color: #f8fafc;
  animation: fadeContent 0.3s ease;
}

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

.content.active {
  display: block;
}

pre {
  background-color: #1e293b;
  color: #e2e8f0;
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 0;
  box-shadow: var(--shadow-sm);
}

code {
  font-family: var(--font-code);
  font-size: 0.9rem;
  line-height: 1.5;
}

.preview-container {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: white;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.preview-header {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: #f1f5f9;
  border-bottom: 1px solid var(--border);
}

.preview-dots {
  display: flex;
  gap: 6px;
  margin-right: var(--spacing-md);
}

.preview-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.preview-dot.red { background-color: #f87171; }
.preview-dot.yellow { background-color: #fbbf24; }
.preview-dot.green { background-color: #34d399; }

.preview-url {
  flex: 1;
  background-color: white;
  border-radius: var(--radius-full);
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.8rem;
  color: var(--text-light);
  font-family: var(--font-main);
  text-align: center;
  border: 1px solid var(--border);
}

iframe {
  width: 100%;
  height: 600px;
  border: none;
  background-color: white;
}

.error {
  background-color: var(--error-light);
  color: var(--error);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  display: none;
  border-left: 4px solid var(--error);
  font-weight: 500;
}

.copy-btn {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background-color: rgba(255, 255, 255, 0.1);
  color: #e2e8f0;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 4px;
}

.copy-btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.code-container {
  position: relative;
}

.examples-section {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: var(--container-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.examples-title {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  color: var(--text);
}

.example-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.example-chip {
  background-color: #f3f4f6;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.example-chip:hover {
  background-color: #e5e7eb;
  border-color: #d1d5db;
}

footer {
  text-align: center;
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-xl) 0;
  color: var(--text-light);
  font-size: 0.9rem;
}

footer a {
  color: var(--primary);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .container {
    padding: var(--spacing-md);
  }
  
  h1 {
    font-size: 2rem;
  }
  
  .input-section, .output-section {
    padding: var(--spacing-lg);
  }
  
  .tabs {
    flex-wrap: wrap;
    gap: var(--spacing-xs);
  }
  
  .tab {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }
  
  iframe {
    height: 400px;
  }
  
  .example-chips {
    flex-direction: column;
  }
  
  .example-chip {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0f172a;
    --container-bg: #1e293b;
    --text: #f1f5f9;
    --text-light: #94a3b8;
    --border: #334155;
    --border-focus: #3b82f6;
  }
  
  textarea {
    background-color: #0f172a;
    color: #f1f5f9;
  }
  
  textarea::placeholder {
    color: #64748b;
  }
  
  pre {
    background-color: #0f172a;
  }
  
  .preview-header {
    background-color: #1e293b;
  }
  
  .preview-url {
    background-color: #0f172a;
    color: #94a3b8;
  }
  
  .example-chip {
    background-color: #1e293b;
  }
  
  .example-chip:hover {
    background-color: #334155;
  }
}

.input-section, .output-section, .loader, .examples-section {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.input-section {
  animation-delay: 0.2s;
}

.examples-section {
  animation-delay: 0.4s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes highlight {
  0% {
    background-color: rgba(79, 70, 229, 0.2);
  }
  100% {
    background-color: transparent;
  }
}

.highlight {
  animation: highlight 2s ease;
}

.gradient-button {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  z-index: 1;
  overflow: hidden;
}

.gradient-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary-dark), var(--secondary-dark));
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.gradient-button:hover::before {
  opacity: 1;
}

.gradient-button:hover {
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}