@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* Dark theme colors */
  --bg-primary: #0a0e14;
  --bg-secondary: #151922;
  --bg-tertiary: #1f2430;
  --bg-glass: rgba(31, 36, 48, 0.7);
  --text-primary: #e6e9f0;
  --text-secondary: #b8bcc8;
  --text-muted: #6c7a89;
  --accent-primary: #00d9ff;
  --accent-secondary: #7c3aed;
  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --canvas-bg: #1a1f2e;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.8);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent-primary: #0ea5e9;
  --accent-secondary: #8b5cf6;
  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --border-color: rgba(0, 0, 0, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
  --canvas-bg: #e2e8f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInDown 0.6s ease;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin: 0;
  animation: fadeIn 0.8s ease;
}

.theme-toggle {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
  z-index: 100;
}

.theme-toggle:hover {
  transform: scale(1.1) rotate(15deg);
  box-shadow: var(--shadow-md);
}

.theme-toggle svg {
  width: 24px;
  height: 24px;
  fill: var(--text-primary);
}

.main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease;
}

.preview-section {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  transition: all 0.3s ease;
}

.preview-section:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

canvas {
  background: var(--canvas-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease;
}

canvas:hover {
  transform: scale(1.02);
}

.controls-section {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

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

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1.5rem 0;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 2px;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

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

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.control-value {
  color: var(--accent-primary);
  font-weight: 600;
  font-size: 0.875rem;
  min-width: 3rem;
  text-align: right;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  transition: background 0.3s ease;
}

input[type="range"]:hover {
  background: var(--bg-secondary);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 12px var(--accent-primary);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 12px var(--accent-primary);
}

input[type="color"] {
  width: 100%;
  height: 42px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  background: var(--bg-tertiary);
  transition: all 0.3s ease;
}

input[type="color"]:hover {
  border-color: var(--accent-primary);
  transform: scale(1.02);
}

select {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.3s ease;
  outline: none;
}

select:hover,
select:focus {
  border-color: var(--accent-primary);
  background: var(--bg-secondary);
}

.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  user-select: none;
}

input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--accent-primary);
}

.presets {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
  animation: fadeInUp 1s ease;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}

.preset-btn {
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.preset-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s ease;
}

.preset-btn:hover::before {
  left: 100%;
}

.preset-btn:hover {
  border-color: var(--accent-primary);
  background: var(--bg-secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.preset-btn:active {
  transform: translateY(0);
}

.output-section {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
  animation: fadeInUp 1.2s ease;
}

.button-group {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

button {
  flex: 1;
  padding: 0.875rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

button.primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  box-shadow: var(--shadow-sm);
}

button.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 217, 255, 0.4);
}

button.secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

button.secondary:hover {
  border-color: var(--accent-primary);
  background: var(--bg-secondary);
  transform: translateY(-2px);
}

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

button.copied {
  background: var(--accent-success);
  animation: pulse 0.5s ease;
}

textarea {
  width: 100%;
  min-height: 100px;
  resize: vertical;
  border-radius: 8px;
  padding: 1rem;
  background: var(--bg-tertiary);
  color: var(--accent-primary);
  border: 2px solid var(--border-color);
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  transition: all 0.3s ease;
  outline: none;
}

textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

.help-section {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
  animation: fadeInUp 1.4s ease;
}

.help-content {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.875rem;
}

.help-content h3 {
  color: var(--text-primary);
  font-size: 1rem;
  margin: 1rem 0 0.5rem 0;
}

.help-content h3:first-child {
  margin-top: 0;
}

.help-content code {
  background: var(--bg-tertiary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--accent-primary);
}

footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: 2rem 0;
  animation: fadeIn 1.6s ease;
}

footer a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

footer a:hover {
  color: var(--accent-secondary);
  text-decoration: underline;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .app {
    padding: 1.5rem 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .theme-toggle {
    top: 1rem;
    right: 1rem;
    width: 42px;
    height: 42px;
  }

  .main {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .preview-section,
  .controls-section,
  .presets,
  .output-section,
  .help-section {
    padding: 1.5rem;
  }

  canvas {
    max-width: 100%;
    height: auto;
  }

  .preset-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

  .button-group {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.75rem;
  }

  .subtitle {
    font-size: 0.875rem;
  }

  .preset-grid {
    grid-template-columns: 1fr 1fr;
  }
}