/* Big Car Stencil Software - Frutiger Aero Mobile-First */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --glass-white: rgba(255, 255, 255, 0.65);
  --glass-light: rgba(255, 255, 255, 0.45);
  --glass-ultra: rgba(255, 255, 255, 0.35);
  --glass-panel: rgba(255, 255, 255, 0.55);
  --glass-input: rgba(255, 255, 255, 0.4);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-border-strong: rgba(255, 255, 255, 0.25);
  --accent: #00d46a;
  --accent-light: #4ade80;
  --accent-dark: #00b359;
  --accent-glow: rgba(0, 212, 106, 0.5);
  --accent-glow-strong: rgba(0, 212, 106, 0.7);
  --text: #0a4d2e;
  --text-dim: #2d7a50;
  --text-dark: #063d23;
  --shadow: rgba(0, 100, 50, 0.12);
  --shadow-strong: rgba(0, 100, 50, 0.2);
}

html, body {
  height: 100%;
  overflow: hidden;
  touch-action: manipulation;
  overscroll-behavior: none;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'SF Pro Display', sans-serif;
  background: 
    radial-gradient(ellipse at top left, rgba(255,255,255,0.6) 0%, transparent 60%),
    radial-gradient(ellipse at top right, rgba(255,255,255,0.4) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(0,212,106,0.15) 0%, transparent 50%),
    linear-gradient(160deg, #e8f8ef 0%, #c5f0d5 25%, #90e8b0 50%, #4ade80 80%, #22c55e 100%);
  background-attachment: fixed;
  color: var(--text);
  position: fixed;
  inset: 0;
}

/* Decorative floating orbs */
body::before,
body::after {
  content: '';
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
}

body::before {
  width: 300px;
  height: 300px;
  top: -100px;
  right: -50px;
  background: radial-gradient(circle, rgba(255,255,255,0.25) 0%, transparent 70%);
}

body::after {
  width: 400px;
  height: 400px;
  bottom: -150px;
  left: -100px;
  background: radial-gradient(circle, rgba(0,212,106,0.2) 0%, transparent 70%);
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
  height: 100svh;
  overflow: hidden;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0.08) 100%);
  backdrop-filter: blur(40px) saturate(1.5);
  -webkit-backdrop-filter: blur(40px) saturate(1.5);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 30px var(--shadow);
  flex-shrink: 0;
}

.logo {
  font-family: 'Press Start 2P', cursive;
  font-size: 6px;
  letter-spacing: 0.5px;
  color: #00b359;
  text-shadow: none;
  image-rendering: pixelated;
}

.header-btn {
  padding: 5px 10px;
  background: linear-gradient(180deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.1) 100%);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  color: var(--text);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 4px 15px var(--shadow);
}

.header-btn:hover, .header-btn:active {
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--accent) 100%);
  color: white;
  border-color: var(--accent);
  transform: scale(1.05);
  box-shadow: 0 6px 25px var(--accent-glow);
}

/* Main Layout - Mobile First */
main {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  padding: 4px;
  gap: 4px;
  min-height: 0;
}

/* Controls Panel */
#controls {
  background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0.08) 100%);
  backdrop-filter: blur(40px) saturate(1.5);
  -webkit-backdrop-filter: blur(40px) saturate(1.5);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 6px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 5px;
  box-shadow: 0 8px 40px var(--shadow);
  flex-shrink: 0;
}

.control-section {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.section-title {
  font-size: 8px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
}

.section-title + input + .section-title {
  margin-top: 2px;
}

.section-title span {
  color: var(--accent-dark);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Upload Area */
.upload-area {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  padding: 6px;
  background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0.08) 100%);
  border: 2px dashed var(--accent);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  gap: 6px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.upload-area:hover, .upload-area:active, .upload-area.dragover {
  border-color: var(--accent-dark);
  background: linear-gradient(180deg, rgba(0,212,106,0.2) 0%, rgba(0,212,106,0.1) 100%);
  transform: scale(1.02);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.upload-area.has-image {
  padding: 4px 8px;
  border-style: solid;
  flex-direction: row;
  justify-content: center;
}

.upload-area.has-image .upload-icon {
  display: none;
}

.upload-area.has-image .upload-text {
  font-size: 10px;
}

.upload-icon {
  font-size: 18px;
  color: var(--accent);
  font-weight: 300;
}

.upload-text {
  font-size: 10px;
  color: var(--text-dim);
  font-weight: 600;
}

.image-info {
  font-size: 9px;
  color: var(--text-dim);
  text-align: center;
}

/* Mode Grid */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.mode-btn {
  padding: 6px 4px;
  background: linear-gradient(180deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.1) 100%);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text);
  font-size: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  box-shadow: 0 3px 12px var(--shadow);
}

.mode-btn:hover, .mode-btn:active {
  transform: translateY(-2px);
  background: rgba(255,255,255,0.25);
  box-shadow: 0 6px 20px var(--shadow);
}

.mode-btn.active {
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--accent) 100%);
  border-color: var(--accent-dark);
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
  box-shadow: 0 6px 25px var(--accent-glow);
}

/* Sliders */
input[type="range"] {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(180deg, rgba(0,0,0,0.08) 0%, rgba(0,0,0,0.04) 100%);
  border-radius: 6px;
  cursor: pointer;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
  touch-action: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--accent) 100%);
  border: 2px solid var(--accent-dark);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 15px var(--accent-glow);
  will-change: transform;
}

input[type="range"]::-webkit-slider-thumb:active {
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-dark) 100%);
  box-shadow: 0 6px 25px var(--accent-glow-strong);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--accent) 100%);
  border: 2px solid var(--accent-dark);
  border-radius: 50%;
  cursor: pointer;
}

.main-slider {
  height: 8px;
}

.main-slider::-webkit-slider-thumb {
  width: 22px;
  height: 22px;
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.slider-group label {
  font-size: 9px;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
  font-weight: 600;
}

.slider-group label span {
  color: var(--accent-dark);
  font-weight: 700;
}

/* Toggle Options */
.toggle-row {
  display: flex;
  gap: 10px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 9px;
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
}

.toggle input {
  width: 14px;
  height: 14px;
  accent-color: var(--accent);
}

/* Action Buttons */
.actions {
  display: flex;
  flex-direction: row;
  gap: 6px;
  flex-wrap: nowrap;
}

.save-btn {
  flex: 1;
  min-width: 60px;
  padding: 6px 4px;
  background: linear-gradient(180deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.1) 100%);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text);
  font-size: 8px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 4px 15px var(--shadow);
}

.save-btn:hover, .save-btn:active {
  transform: translateY(-2px) scale(1.02);
}

.save-btn.primary {
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--accent) 100%);
  border-color: var(--accent-dark);
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
  box-shadow: 0 6px 30px var(--accent-glow);
}

.save-btn.primary:hover, .save-btn.primary:active {
  box-shadow: 0 8px 40px var(--accent-glow-strong);
}

.reset-btn {
  padding: 8px 12px;
  background: transparent;
  border: 2px solid var(--accent);
  border-radius: 12px;
  color: var(--accent-dark);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.reset-btn:hover, .reset-btn:active {
  background: rgba(0, 212, 106, 0.15);
  border-color: var(--accent-dark);
}

/* Preview Area */
#preview {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.06) 100%);
  backdrop-filter: blur(40px) saturate(1.5);
  -webkit-backdrop-filter: blur(40px) saturate(1.5);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 40px var(--shadow);
  min-height: 0;
}

.preview-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.preview-tabs {
  display: flex;
  gap: 6px;
  padding: 6px 10px;
  background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
}

.preview-tab {
  flex: 1;
  padding: 6px 12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0.08) 100%);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  color: var(--text-dim);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.preview-tab:hover, .preview-tab:active {
  color: var(--text);
  background: rgba(255,255,255,0.2);
}

.preview-tab.active {
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--accent) 100%);
  color: white;
  border-color: var(--accent-dark);
  box-shadow: 0 4px 20px var(--accent-glow);
}

/* Canvas Wrapper */
.canvas-wrapper {
  flex: 1;
  display: none;
  gap: 10px;
  padding: 10px;
  overflow: hidden;
  background: 
    linear-gradient(45deg, rgba(0,212,106,0.08) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0,212,106,0.08) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0,212,106,0.08) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0,212,106,0.08) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: rgba(255,255,255,0.3);
}

.canvas-pane {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.2) 100%);
  border-radius: 16px;
  min-width: 0;
  border: 1px solid var(--glass-border);
}

.canvas-pane canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 4px 25px var(--shadow-strong);
}

.pane-label {
  position: absolute;
  bottom: 8px;
  left: 8px;
  padding: 6px 14px;
  background: linear-gradient(180deg, rgba(255,255,255,0.85) 0%, rgba(255,255,255,0.6) 100%);
  border-radius: 20px;
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 700;
  box-shadow: 0 2px 10px var(--shadow);
  backdrop-filter: blur(10px);
}

.split-handle {
  display: none;
}

/* Empty State */
.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: radial-gradient(circle at center, rgba(0,212,106,0.1) 0%, transparent 60%);
  cursor: pointer;
}

.empty-icon {
  font-size: 40px;
  font-family: 'Press Start 2P', cursive;
  color: var(--accent);
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.7; }
}

.empty-text {
  font-size: 11px;
  color: var(--text-dim);
  font-weight: 600;
}

/* Zoom Bar */
.zoom-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px;
  background: linear-gradient(180deg, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.2) 100%);
  border-top: 1px solid var(--glass-border);
  flex-shrink: 0;
}

.zoom-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, rgba(255,255,255,0.7) 0%, rgba(255,255,255,0.4) 100%);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 2px 8px var(--shadow);
}

.zoom-btn:hover, .zoom-btn:active {
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--accent) 100%);
  color: white;
  transform: scale(1.1);
  box-shadow: 0 4px 15px var(--accent-glow);
}

#zoomLevel {
  font-size: 10px;
  color: var(--text-dim);
  min-width: 40px;
  text-align: center;
  font-weight: 700;
}

/* Scrollbar */
#controls::-webkit-scrollbar {
  width: 6px;
}

#controls::-webkit-scrollbar-track {
  background: rgba(255,255,255,0.2);
  border-radius: 3px;
}

#controls::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--accent) 100%);
  border-radius: 3px;
}

/* Smooth transitions */
button, input, .upload-area, .mode-btn, .save-btn, .reset-btn, .zoom-btn, .header-btn, .preview-tab {
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Focus states */
button:focus-visible, 
input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ===== TABLET/DESKTOP RESPONSIVE ===== */
@media (min-width: 768px) {
  body {
    position: static;
  }
  
  #app {
    height: 100vh;
  }
  
  main {
    flex-direction: row;
    padding: 16px;
    gap: 16px;
  }
  
  header {
    padding: 14px 24px;
  }
  
  .logo {
    font-size: 10px;
  }
  
  #controls {
    width: 300px;
    min-width: 300px;
    flex-shrink: 0;
    max-height: none;
    overflow-y: auto;
    padding: 16px;
    gap: 14px;
    border-radius: 20px;
  }
  
  .control-section {
    gap: 8px;
  }
  
  .section-title {
    font-size: 10px;
  }
  
  .mode-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
  }
  
  .mode-btn {
    padding: 10px 6px;
    font-size: 10px;
    border-radius: 14px;
  }
  
  .upload-area {
    padding: 20px;
    flex-direction: column;
  }
  
  .upload-icon {
    font-size: 28px;
  }
  
  .upload-text {
    font-size: 13px;
  }
  
  input[type="range"] {
    height: 10px;
  }
  
  input[type="range"]::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
  }
  
  .main-slider {
    height: 12px;
  }
  
  .main-slider::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
  }
  
  .toggle {
    font-size: 12px;
    gap: 8px;
  }
  
  .toggle input {
    width: 18px;
    height: 18px;
  }
  
  .actions {
    flex-direction: column;
  }
  
  .save-btn {
    min-width: auto;
    padding: 14px;
    font-size: 13px;
    border-radius: 16px;
  }
  
  .reset-btn {
    padding: 10px 16px;
    font-size: 12px;
  }
  
  #preview {
    border-radius: 20px;
  }
  
  .preview-tabs {
    padding: 10px 14px;
    gap: 8px;
  }
  
  .preview-tab {
    padding: 10px 16px;
    font-size: 12px;
    border-radius: 25px;
  }
  
  .empty-icon {
    font-size: 60px;
  }
  
  .empty-text {
    font-size: 14px;
  }
  
  .zoom-bar {
    padding: 10px;
    gap: 8px;
  }
  
  .zoom-btn {
    width: 36px;
    height: 36px;
    font-size: 18px;
    border-radius: 12px;
  }
  
  #zoomLevel {
    font-size: 12px;
    min-width: 50px;
  }
  
  .header-btn {
    padding: 10px 20px;
    font-size: 13px;
  }
}

/* Large desktop */
@media (min-width: 1200px) {
  #controls {
    width: 340px;
    padding: 24px;
    gap: 18px;
  }
  
  .logo {
    font-size: 12px;
  }
  
  .mode-btn {
    padding: 12px 8px;
    font-size: 11px;
  }
  
  .save-btn {
    padding: 16px;
    font-size: 14px;
  }
}