@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ==================== CSS VARIABLES ==================== */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fb;
  --bg-tertiary: #f0f2f5;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.7);
  --bg-glass-hover: rgba(255, 255, 255, 0.9);
  --border-glass: rgba(0, 0, 0, 0.08);
  --border-glass-hover: rgba(232, 129, 26, 0.3);
  --text-primary: #1a1a2e;
  --text-secondary: #555770;
  --text-muted: #8e90a6;
  /* Orange tones from Kitaptan.com logo */
  --accent-primary: #e8811a;
  --accent-secondary: #f09a3e;
  --accent-tertiary: #d06b0a;
  --accent-gradient: linear-gradient(135deg, #e8811a, #f09a3e, #f5b041);
  --accent-glow: 0 0 20px rgba(232, 129, 26, 0.25);
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 22px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.07);
  --shadow-lg: 0 8px 28px rgba(0,0,0,0.1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-primary: 'Inter', -apple-system, sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;
}

/* ==================== RESET & BASE ==================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 14px; scroll-behavior: smooth; }

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(232, 129, 26, 0.25); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(232, 129, 26, 0.45); }

/* ==================== APP LAYOUT ==================== */
#app {
  display: grid;
  grid-template-rows: 56px 1fr 36px;
  grid-template-columns: 300px 1fr 320px;
  grid-template-areas:
    "header header header"
    "sidebar viewport results"
    "statusbar statusbar statusbar";
  height: 100vh;
  position: relative;
  z-index: 1;
}

/* ==================== HEADER ==================== */
.header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: #2d3e50;
  border-bottom: 1px solid rgba(0,0,0,0.15);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  z-index: 100;
}

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

.header-logo {
  height: 36px;
  width: auto;
  object-fit: contain;
}

.header-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
}

.header-subtitle {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
  font-weight: 400;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-glass-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.header .btn {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
  color: #ffffff;
}

.header .btn:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.35);
  color: #ffffff;
}

.btn-primary {
  background: var(--accent-gradient);
  border-color: transparent;
  color: white;
  box-shadow: var(--accent-glow);
}

.btn-primary:hover {
  box-shadow: 0 0 30px rgba(232, 129, 26, 0.4);
  transform: translateY(-1px);
}

/* ==================== SIDEBAR ==================== */
.sidebar {
  grid-area: sidebar;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-glass);
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel-section {
  background: #ffffff;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 14px;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.panel-section:hover {
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-md);
}

.panel-section-title {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-section-title .icon {
  font-size: 1rem;
}

/* ==================== FORM CONTROLS ==================== */
.control-group {
  margin-bottom: 12px;
}

.control-group:last-child { margin-bottom: 0; }

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.control-value {
  font-weight: 600;
  color: var(--accent-primary);
  font-size: 0.8rem;
}

/* Range Slider */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-gradient);
  box-shadow: 0 0 8px rgba(232, 129, 26, 0.4);
  cursor: pointer;
  transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 14px rgba(232, 129, 26, 0.6);
}

/* Select */
.custom-select {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: var(--transition);
}

.custom-select:hover, .custom-select:focus {
  border-color: var(--accent-primary);
}

.custom-select option {
  background: #fff;
  color: var(--text-primary);
}

/* Toggle */
.toggle-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.toggle {
  position: relative;
  width: 40px;
  height: 22px;
  cursor: pointer;
}

.toggle input { display: none; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-tertiary);
  border-radius: 11px;
  border: 1px solid var(--border-glass);
  transition: var(--transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: var(--transition);
}

.toggle input:checked + .toggle-slider {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(18px);
  background: white;
}

/* ==================== VIEWPORT ==================== */
.viewport {
  grid-area: viewport;
  position: relative;
  background: #f0f2f5;
  overflow: hidden;
}

.viewport canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* Upload Zone */
.upload-zone {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
  cursor: pointer;
  transition: var(--transition);
}

.upload-zone.hidden { display: none; }

.upload-zone-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 48px 64px;
  border: 2px dashed rgba(232, 129, 26, 0.3);
  border-radius: var(--radius-xl);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.upload-zone:hover .upload-zone-inner,
.upload-zone.drag-over .upload-zone-inner {
  border-color: var(--accent-primary);
  background: rgba(232, 129, 26, 0.05);
  box-shadow: 0 0 40px rgba(232, 129, 26, 0.12);
}

.upload-icon {
  width: 80px;
  height: 80px;
  background: var(--accent-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  box-shadow: 0 0 30px rgba(232, 129, 26, 0.25);
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(232, 129, 26, 0.2); }
  50% { box-shadow: 0 0 40px rgba(232, 129, 26, 0.4); }
}

.upload-text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.upload-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.upload-btn {
  padding: 10px 24px;
  background: var(--accent-gradient);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-family: var(--font-primary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--accent-glow);
  transition: var(--transition);
}

.upload-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(232, 129, 26, 0.4);
}

/* Viewport toolbar */
.viewport-toolbar {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  padding: 4px;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
  z-index: 10;
}

.viewport-toolbar.hidden { display: none; }

.toolbar-btn {
  padding: 8px 12px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.toolbar-btn:hover, .toolbar-btn.active {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.toolbar-btn.active {
  background: rgba(232, 129, 26, 0.12);
  color: var(--accent-primary);
}

/* ==================== RESULTS PANEL ==================== */
.results-panel {
  grid-area: results;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-glass);
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Result Card */
.result-card {
  background: #ffffff;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 14px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.result-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: var(--transition);
}

.result-card:hover {
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-md);
}

.result-card:hover::before { opacity: 1; }

.result-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.result-card-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.result-card-icon.purple { background: rgba(232, 129, 26, 0.1); color: #e8811a; }
.result-card-icon.green { background: rgba(34,197,94,0.1); color: #16a34a; }
.result-card-icon.orange { background: rgba(245,158,11,0.1); color: #d97706; }
.result-card-icon.blue { background: rgba(59,130,246,0.1); color: #2563eb; }
.result-card-icon.pink { background: rgba(236,72,153,0.1); color: #db2777; }

.result-card-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.result-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.result-unit {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 4px;
}

.result-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Dimensions grid */
.dimensions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.dim-item {
  text-align: center;
  padding: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
}

.dim-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.dim-value {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
}

.dim-value.x { color: #ef4444; }
.dim-value.y { color: #22c55e; }
.dim-value.z { color: #3b82f6; }

/* Layer slider */
.layer-slider-container {
  padding: 14px;
  background: #ffffff;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.layer-slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.layer-slider-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.layer-slider-value {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-primary);
}

/* ==================== STATUS BAR ==================== */
.statusbar {
  grid-area: statusbar;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: #ffffff;
  border-top: 1px solid var(--border-glass);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.statusbar-left, .statusbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.status-dot.ready { background: var(--success); box-shadow: 0 0 8px rgba(34,197,94,0.4); }
.status-dot.processing { background: var(--accent-primary); animation: blink 1s infinite; }

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ==================== LOADING OVERLAY ==================== */
.loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.loading-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-tertiary);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ==================== TOOLTIP ==================== */
.tooltip-wrap {
  position: relative;
}

.tooltip-wrap::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) scale(0.9);
  padding: 6px 10px;
  background: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: #fff;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  z-index: 1000;
}

.tooltip-wrap:hover::after {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1200px) {
  #app {
    grid-template-columns: 260px 1fr 280px;
  }
}

@media (max-width: 900px) {
  #app {
    grid-template-columns: 1fr;
    grid-template-rows: 56px auto 1fr auto 36px;
    grid-template-areas:
      "header"
      "sidebar"
      "viewport"
      "results"
      "statusbar";
    overflow-y: auto;
  }

  .sidebar, .results-panel {
    border: none;
    border-bottom: 1px solid var(--border-glass);
  }

  .viewport { min-height: 400px; }
}

/* ==================== FILE INPUT HIDDEN ==================== */
#file-input { display: none; }