:root {
  --primary: #2D3436;
  --secondary: #636E72;
  --accent: #0984E3;
  --bg-color: #0D1117;
  --sidebar-bg: rgba(22, 27, 34, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-main: #FFFFFF;
  --text-muted: #8B949E;
  
  --border-radius: 12px;
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: all 0.2s ease-in-out;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  height: 100vh;
  overflow: hidden;
  background-image: 
    radial-gradient(circle at top right, rgba(9, 132, 227, 0.05), transparent 40%),
    radial-gradient(circle at bottom left, rgba(45, 52, 54, 0.2), transparent 40%);
}

.app-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  height: 100vh;
}

/* Glassmorphism utility */
.glass {
  background: var(--sidebar-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-right: 1px solid var(--border-color);
}

/* Sidebar */
.controls-sidebar {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow-y: auto;
}

.controls-sidebar::-webkit-scrollbar {
  width: 6px;
}
.controls-sidebar::-webkit-scrollbar-track {
  background: transparent;
}
.controls-sidebar::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.sidebar-header p {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
}

.accordion {
  flex-grow: 1;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.control-section h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
}

.control-section h3::after {
  content: '';
  flex-grow: 1;
  height: 1px;
  background-color: var(--border-color);
  margin-left: 0.8rem;
}

.control-group {
  margin-bottom: 1rem;
}

.control-group label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.input {
  width: 100%;
  padding: 0.6rem 0.8rem;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
}

.input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(9, 132, 227, 0.15);
}

.input option {
  background: var(--primary);
}

/* Buttons */
.btn {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-main);
}

.full-width {
  width: 100%;
}

.btn.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 12px rgba(9, 132, 227, 0.3);
}

.btn.primary:hover {
  background: #0a74c6;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(9, 132, 227, 0.4);
}

.btn.secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn.secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn.accent.outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn.accent.outline:hover {
  background: rgba(9, 132, 227, 0.1);
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
  font-size: inherit;
  font-family: inherit;
}

/* Colors */
.color-pickers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.color-control {
  display: flex;
  flex-direction: column;
}

input[type="color"] {
  width: 100%;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  background: none;
  padding: 2px;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}
input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 6px;
}

/* Checkboxes */
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.checkbox {
  display: flex;
  align-items: center;
  position: relative;
  padding-left: 28px;
  cursor: pointer;
  font-size: 0.9rem;
  user-select: none;
}

.checkbox input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.checkmark {
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 18px;
  width: 18px;
  background-color: rgba(255,255,255,0.05);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  transition: var(--transition);
}

.checkbox:hover input ~ .checkmark {
  background-color: rgba(255,255,255,0.1);
}

.checkbox input:checked ~ .checkmark {
  background-color: var(--accent);
  border-color: var(--accent);
}

.checkmark:after {
  content: "";
  position: absolute;
  display: none;
}

.checkbox input:checked ~ .checkmark:after {
  display: block;
}

.checkbox .checkmark:after {
  left: 6px;
  top: 2px;
  width: 4px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.hidden { display: none !important; }
.text-center { text-align: center; justify-content: center; }

/* Sidebar Footer */
.sidebar-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
  background: var(--primary);
}

.code-output {
  width: 100%;
  height: 140px;
  background: #000;
  color: #E2E8F0;
  padding: 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: 'SFMono-Regular', Consolas, Menlo, monospace;
  font-size: 0.8rem;
  resize: vertical;
}

/* Preview Area */
.preview-area {
  display: flex;
  flex-direction: column;
  background-color: #0b0e14;
  position: relative;
  overflow: hidden;
}

.preview-controls {
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  background: rgba(0,0,0,0.2);
}

.context-toggles, .variant-toggles {
  display: flex;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  padding: 4px;
}

.toggle-btn {
  background: transparent;
  border: none;
  padding: 0.5rem 1rem;
  color: var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition);
}

.toggle-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.toggle-btn.active {
  background: var(--bg-color);
  color: var(--text-main);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.canvas-wrapper {
  flex-grow: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem;
  overflow: auto;
  /* Checkerboard background for transparency context */
  background-image: linear-gradient(45deg, rgba(255,255,255,0.02) 25%, transparent 25%), 
                    linear-gradient(-45deg, rgba(255,255,255,0.02) 25%, transparent 25%), 
                    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.02) 75%), 
                    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.02) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.preview-container {
  background: transparent;
  width: 100%;
  max-width: 1000px;
  transition: width 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  /* The generated HTML widget will sit here */
}

.preview-container.tablet {
  width: 768px;
}

.preview-container.mobile {
  width: 375px;
}

.info-banner {
  margin: 1rem 2rem 2rem;
  padding: 1rem;
  border: 1px solid var(--accent);
  background: rgba(9, 132, 227, 0.05);
  color: var(--text-main);
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    overflow: auto;
  }
  
  .controls-sidebar {
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
}