:root {
  --bg-primary: #0a0f18;
  --bg-secondary: #111927;
  --bg-card: rgba(19, 29, 45, 0.75);
  --border-color: rgba(0, 240, 255, 0.2);
  --border-hover: rgba(0, 240, 255, 0.5);
  --accent-cyan: #00f0ff;
  --accent-purple: #9d4edd;
  --accent-amber: #f59e0b;
  --accent-green: #10b981;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* HEADER */
.app-header {
  height: 60px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 100;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-badge {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #000;
  font-weight: 800;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 12px;
  text-transform: uppercase;
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, #fff, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-center {
  display: flex;
  align-items: center;
  gap: 12px;
}

.model-badge {
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-header {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-header:hover {
  background: rgba(0, 240, 255, 0.15);
  border-color: var(--accent-cyan);
}

.btn-header.export-stl {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.2), rgba(16, 185, 129, 0.2));
  border-color: var(--accent-cyan);
  color: #fff;
}

.btn-header.export-stl:hover {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
  color: #000;
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
}

/* MAIN WORKSPACE LAYOUT */
.workspace-grid {
  flex: 1;
  display: grid;
  grid-template-columns: 420px 1fr;
  height: calc(100vh - 60px);
  position: relative;
}

/* SIDEBAR CONTROLS */
.sidebar-panel {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 18px;
  gap: 18px;
}

.card-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  backdrop-filter: blur(10px);
}

.section-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.prompt-textarea {
  width: 100%;
  height: 90px;
  background: rgba(10, 15, 24, 0.8);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: #fff;
  padding: 10px;
  font-size: 0.9rem;
  font-family: inherit;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}

.prompt-textarea:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

/* IMAGE UPLOAD DROPZONE */
.image-dropzone {
  border: 1px dashed var(--border-color);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
  cursor: pointer;
  background: rgba(0, 240, 255, 0.02);
  transition: all 0.2s;
  margin-top: 10px;
  position: relative;
}

.image-dropzone:hover {
  border-color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.05);
}

.image-preview-container {
  display: none;
  margin-top: 10px;
  position: relative;
}

.image-preview-container img {
  width: 100%;
  max-height: 120px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.btn-remove-img {
  position: absolute;
  top: 4px;
  right: 4px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 22px;
  height: 22px;
  cursor: pointer;
}

/* GENERATE BUTTON */
.btn-generate {
  width: 100%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #000;
  border: none;
  border-radius: 8px;
  padding: 12px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
  transition: all 0.2s;
}

.btn-generate:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
}

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

.btn-generate:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* PRESETS PILLS */
.presets-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.preset-chip {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.preset-chip:hover {
  background: rgba(0, 240, 255, 0.15);
  border-color: var(--accent-cyan);
}

/* MATERIAL SELECTOR */
.material-colors {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.mat-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.2s;
}

.mat-dot.active {
  border-color: #fff;
  transform: scale(1.15);
}

/* 3D VIEWPORT STAGE */
.viewport-stage {
  position: relative;
  background: radial-gradient(circle at center, #131c2e 0%, #0a0f18 100%);
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#canvas3d {
  width: 100%;
  height: 100%;
  display: block;
}

/* VIEWPORT OVERLAYS */
.viewport-controls-bar {
  position: absolute;
  top: 16px;
  left: 16px;
  display: flex;
  gap: 8px;
  z-index: 10;
}

.vp-btn {
  background: rgba(17, 25, 39, 0.8);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: all 0.2s;
}

.vp-btn:hover {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--accent-cyan);
}

.dimensions-badge {
  position: absolute;
  bottom: 16px;
  left: 16px;
  background: rgba(17, 25, 39, 0.85);
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.dimensions-badge span {
  color: var(--accent-cyan);
  font-weight: 700;
}

/* LOADING OVERLAY */
.render-loader {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 15, 24, 0.7);
  backdrop-filter: blur(5px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.render-loader.active {
  opacity: 1;
  pointer-events: all;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(0, 240, 255, 0.2);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* CODE MODAL */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.8);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-overlay.open {
  display: flex;
}

.code-modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  width: 700px;
  max-width: 90vw;
  max-height: 80vh;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.code-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.code-editor {
  flex: 1;
  padding: 16px;
  background: #060911;
  color: #38bdf8;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  overflow-y: auto;
  white-space: pre-wrap;
  user-select: text;
}

/* RESPONSIVE DESIGN */
@media (max-width: 860px) {
  body {
    overflow: auto;
  }
  .workspace-grid {
    grid-template-columns: 1fr;
    height: auto;
  }
  .viewport-stage {
    height: 400px;
    order: -1;
  }
}