:root {
  --bg-dark: #0a0a0c;
  --sidebar-bg: #111115;
  --accent-color: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.4);
  --text-main: #e2e8f0;
  --text-dim: #94a3b8;
  --border-color: #1e1e24;
  --card-bg: rgba(30, 30, 38, 0.6);
  --danger: #ef4444;
  --success: #22c55e;
  --glass: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.08);
  --font-main: 'Outfit', system-ui, -apple-system, sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-main);
  overflow: hidden; /* App-like feel */
  height: 100vh;
}

/* APP LAYOUT */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* SIDEBAR */
.sidebar {
  width: 320px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 10;
  box-shadow: 10px 0 30px rgba(0,0,0,0.3);
}

.logo-area {
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  border-bottom: 1px solid var(--border-color);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-color), #a855f7);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.logo-text {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(to right, #fff, #94a3b8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.control-groups {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.control-group h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.tool-btn {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1rem 0.5rem;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tool-btn i {
  font-size: 1.2rem;
  color: var(--accent-color);
}

.tool-btn span {
  font-size: 0.75rem;
  font-weight: 500;
}

.tool-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.tool-btn:active:not(:disabled) {
  transform: translateY(0);
}

.tool-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  filter: grayscale(1);
}

/* SLIDERS */
.slider-box {
  margin-bottom: 1.2rem;
}

.slider-box label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent-color);
  background: var(--border-color);
  height: 6px;
  border-radius: 3px;
  cursor: pointer;
}

/* ACTIONS */
.action-btns {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.action-btn {
  padding: 0.8rem;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  color: var(--text-main);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.action-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
}

.action-btn.danger {
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.2);
}

.action-btn.danger:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.1);
}

/* SIDEBAR FOOTER */
.sidebar-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
}

.dot {
  width: 8px;
  height: 8px;
  background-color: var(--danger);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(239, 68, 68, 0.5);
  transition: all 0.5s;
}

.status-indicator.ready .dot {
  background-color: var(--success);
  box-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
}

/* MAIN CONTENT */
.main-editor {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  background-image: 
    radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
    linear-gradient(var(--bg-dark), var(--bg-dark));
}

.editor-header {
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  background: rgba(10, 10, 12, 0.5);
  backdrop-filter: blur(10px);
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
}

.breadcrumb span {
  color: var(--text-main);
}

.top-actions {
  display: flex;
  gap: 1rem;
}

.top-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  color: var(--text-main);
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.primary-btn {
  background: var(--accent-color);
  border: none;
  padding: 0.6rem 1.4rem;
  border-radius: 8px;
  color: white;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.primary-btn:hover:not(:disabled) {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

/* CANVAS VIEWPORT */
.canvas-viewport {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  position: relative;
  overflow: hidden;
}

.upload-placeholder {
  width: 100%;
  max-width: 600px;
  height: 400px;
  border: 2px dashed var(--border-color);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
}

.upload-placeholder:hover, .upload-placeholder.dragover {
  border-color: var(--accent-color);
  background: rgba(99, 102, 241, 0.03);
}

.icon-circle {
  width: 80px;
  height: 80px;
  background: var(--glass);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--accent-color);
  margin: 0 auto 1.5rem;
  transition: all 0.3s;
}

.upload-placeholder:hover .icon-circle {
  transform: scale(1.1);
  background: var(--accent-glow);
}

.placeholder-content h2 {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.placeholder-content p {
  color: var(--text-dim);
  margin-bottom: 2rem;
}

.select-btn {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 0.8rem 2rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.canvas-wrapper {
  max-width: 100%;
  max-height: 100%;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  background: #000;
  display: flex;
}

canvas {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 200px);
}

.hidden {
  display: none !important;
}

/* LOADING OVERLAY */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 12, 0.8);
  backdrop-filter: blur(5px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 5;
}

.loader {
  width: 48px;
  height: 48px;
  border: 5px solid var(--glass-border);
  border-bottom-color: var(--accent-color);
  border-radius: 50%;
  display: inline-block;
  box-sizing: border-box;
  animation: rotation 1s linear infinite;
  margin-bottom: 1rem;
}

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

/* RESPONSIVE */
@media (max-width: 900px) {
  .app-container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .control-groups {
    padding: 1rem;
    flex-direction: row;
    overflow-x: auto;
  }
  .control-group {
    min-width: 250px;
  }
}