:root {
  /* Amber Glow Theme */
  --color-primary: #F39C12;
  --color-secondary: #F1C40F;
  --color-accent: #E74C3C;
  --color-background: #1A1400;
  --color-surface: rgba(255, 255, 255, 0.05);
  --color-text: #FFFFFF;
  --color-text-muted: rgba(255, 255, 255, 0.7);
  --color-border: rgba(255, 255, 255, 0.1);

  /* Spacing & Sizing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.app-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--spacing-xs);
}

.app-header p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

/* Main Content */
.app-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  flex: 1;
}

@media (min-width: 768px) {
  .app-main {
    grid-template-columns: 1.5fr 1fr;
    grid-template-rows: auto 1fr;
  }
}

/* Preview Section */
.preview-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  position: relative;
  overflow: hidden;
}

@media (min-width: 768px) {
    .preview-section {
        grid-column: 1 / 2;
        grid-row: 1 / 3;
        min-height: 500px;
    }
}

.gradient-preview {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-md);
  background: linear-gradient(90deg, #F39C12 0%, #E74C3C 100%);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  transition: background 0.2s ease;
}

/* Controls Section */
.controls-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.control-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-muted);
}

.control-group label span {
    color: var(--color-primary);
    font-weight: 600;
    margin-left: var(--spacing-xs);
}

/* Toggle Group */
.toggle-group {
  display: flex;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 4px;
  border: 1px solid var(--color-border);
}

.toggle-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s ease;
}

.toggle-btn.active {
  background: var(--color-primary);
  color: #fff;
}

/* Range Input */
input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  background: transparent;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 20px;
  width: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  margin-top: -8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

input[type="range"]::-webkit-slider-runnable-track {
  width: 100%;
  height: 4px;
  cursor: pointer;
  background: var(--color-border);
  border-radius: 2px;
}

/* Color Stops */
.stops-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.stop-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: var(--color-surface);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.color-input-wrapper {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--color-border);
  cursor: pointer;
}

.color-input {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 150%;
  height: 150%;
  padding: 0;
  border: none;
  cursor: pointer;
}

.position-input {
  flex: 1;
}

.remove-stop-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
  transition: color 0.2s;
}

.remove-stop-btn:hover {
  color: var(--color-accent);
}

.add-stop-btn {
  width: 100%;
  background: transparent;
  border: 1px dashed var(--color-border);
  color: var(--color-primary);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: all 0.2s;
  font-weight: 500;
}

.add-stop-btn:hover {
  background: rgba(243, 156, 18, 0.1);
  border-color: var(--color-primary);
}

/* Output Section */
.output-section {
    grid-column: 1 / -1;
}

@media (min-width: 768px) {
    .output-section {
        grid-column: 2 / 3;
    }
}

.code-output {
  background: #000;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.code-output pre {
  overflow-x: auto;
  white-space: nowrap;
  font-family: monospace;
  color: var(--color-text);
  font-size: 0.9rem;
}

.code-output code {
    background: transparent;
}

.copy-btn {
  background: var(--color-secondary);
  color: #000;
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: transform 0.1s, background 0.2s;
}

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

.copy-btn:active {
  transform: scale(0.95);
}

/* Footer */
.app-footer {
  text-align: center;
  margin-top: var(--spacing-xl);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* Utilities */
.hidden {
  display: none !important;
}