/* Global Reset & Styling Variables (Premium Light Theme) */
:root {
  --bg-app: #f8fafc;
  --bg-sidebar: rgba(255, 255, 255, 0.8);
  --bg-card: rgba(241, 245, 249, 0.9);
  --border-color: rgba(15, 23, 42, 0.08);
  --border-color-focus: rgba(99, 102, 241, 0.4);
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --accent-color: #6366f1;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --accent-glow: rgba(99, 102, 241, 0.08);
  --danger-color: #ef4444;
  --success-color: #10b981;
  --font-title: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
}

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

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

/* App Container Layout */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* Sidebar Styling (Glassmorphism - Light Mode) */
.sidebar {
  width: 380px;
  background: var(--bg-sidebar);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  flex-shrink: 0;
  overflow-y: auto;
  z-index: 10;
  box-shadow: 4px 0 30px rgba(15, 23, 42, 0.03);
}

.brand {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

.logo-icon {
  font-size: 24px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: pulse 2s infinite alternate;
}

.logo-text h1 {
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.logo-text span {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
  display: block;
  margin-top: 2px;
}

/* Panel Sections */
.panel-section {
  padding: 24px;
  border-bottom: 1px solid var(--border-color);
}

.panel-section h2 {
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

/* Form Controls */
.form-group {
  margin-bottom: 18px;
}

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

.form-group-checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
  margin-bottom: 4px;
}

.form-group-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--accent-color);
}

.form-group-checkbox label {
  margin-bottom: 0;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
}

label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.label-with-value {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.label-with-value label {
  margin-bottom: 0;
}

.value-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
  background-color: rgba(15, 23, 42, 0.05);
  padding: 2px 8px;
  border-radius: 6px;
  border: 1px solid rgba(0, 0, 0, 0.03);
}

select {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: 8px;
  outline: none;
  font-family: var(--font-body);
  font-size: 13px;
  transition: all 0.2s ease;
  cursor: pointer;
}

select:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Custom Input Range styling */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(15, 23, 42, 0.08);
  border-radius: 3px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-primary);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
  background: var(--accent-color);
}

/* Upload Area (Sleek Drag & Drop) */
.upload-area {
  background: var(--bg-card);
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 30px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.upload-area:hover, .upload-area.drag-over {
  border-color: var(--accent-color);
  background: rgba(99, 102, 241, 0.03);
  box-shadow: 0 0 20px var(--accent-glow);
}

.upload-icon {
  font-size: 28px;
  margin-bottom: 12px;
  transition: transform 0.3s ease;
}

.upload-area:hover .upload-icon {
  transform: translateY(-4px) scale(1.1);
}

.upload-text {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.upload-info {
  font-size: 11px;
  color: var(--text-secondary);
}

/* File Status Box */
.file-status {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(15, 23, 42, 0.02);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 8px;
  margin-top: 12px;
  font-size: 12px;
}

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

.file-status.has-file .status-indicator {
  background-color: var(--success-color);
  box-shadow: 0 0 8px var(--success-color);
}

.status-name {
  flex-grow: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-secondary);
}

.file-status.has-file .status-name {
  color: var(--text-primary);
}

.btn-text-danger {
  background: none;
  border: none;
  color: var(--danger-color);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  padding: 2px 4px;
}

.btn-text-danger:hover {
  text-decoration: underline;
}

/* Background Options button grid */
.bg-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 12px;
}

.bg-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 8px;
  padding: 10px 6px;
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.bg-btn:hover {
  border-color: var(--border-color-focus);
  color: var(--text-primary);
}

.bg-btn.active {
  border-color: var(--accent-color);
  color: var(--text-primary);
  background: rgba(99, 102, 241, 0.05);
}

.bg-preview {
  width: 28px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid rgba(15, 23, 42, 0.1);
}

.bg-preview.transp {
  background-image: linear-gradient(45deg, #cbd5e1 25%, transparent 25%), linear-gradient(-45deg, #cbd5e1 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #cbd5e1 75%), linear-gradient(-45deg, transparent 75%, #cbd5e1 75%);
  background-size: 8px 8px;
  background-position: 0 0, 0 4px, 4px -4px, -4px 0px;
}

.bg-preview.solid {
  background-color: #f1f5f9;
}

.bg-preview.grad {
  background: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
}

.bg-sub-controls {
  background: rgba(15, 23, 42, 0.01);
  border: 1px solid var(--border-color);
  padding: 12px;
  border-radius: 8px;
  animation: slideDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.bg-sub-controls label {
  font-size: 11px;
  margin-top: 8px;
  display: block;
}

.bg-sub-controls label:first-of-type {
  margin-top: 0;
}

.gradient-inputs {
  display: flex;
  gap: 10px;
}

input[type="color"] {
  -webkit-appearance: none;
  border: none;
  width: 100%;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  background: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

/* Secondary Button styling */
.btn-secondary {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 10px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-secondary:hover {
  border-color: var(--border-color-focus);
  background-color: rgba(15, 23, 42, 0.03);
}

.btn-secondary:active {
  transform: scale(0.98);
}

/* Sidebar Footer & Primary Action */
.sidebar-footer {
  margin-top: auto;
  padding: 24px;
  border-top: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.5);
}

.btn-primary {
  width: 100%;
  background: var(--accent-gradient);
  border: none;
  color: #ffffff;
  padding: 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.2);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
}

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

.btn-primary:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  box-shadow: none;
}

/* Preview Work Area */
.preview-area {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 40px;
  background-image: radial-gradient(circle at center, #f1f5f9 0%, #e2e8f0 100%);
}

/* Canvas Display wrapper */
.canvas-wrapper {
  position: relative;
  max-width: 100%;
  max-height: calc(100% - 40px);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 10px;
}

canvas {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
  background-image: linear-gradient(45deg, #e2e8f0 25%, transparent 25%), linear-gradient(-45deg, #e2e8f0 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #e2e8f0 75%), linear-gradient(-45deg, transparent 75%, #e2e8f0 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  cursor: grab;
}

/* Placeholder box */
.canvas-placeholder {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  max-width: 320px;
  animation: fadeIn 0.4s ease-out;
  pointer-events: none; /* Make sure placeholder doesn't block dragging */
}

.placeholder-icon {
  font-size: 48px;
  margin-bottom: 16px;
  animation: float 3s ease-in-out infinite;
}

.canvas-placeholder h3 {
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.canvas-placeholder p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.preview-footer {
  position: absolute;
  bottom: 24px;
  right: 24px;
}

.dimension-tag {
  font-family: monospace;
  font-size: 11px;
  color: var(--text-secondary);
  background-color: rgba(255, 255, 255, 0.8);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.02);
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(15, 23, 42, 0.08);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(15, 23, 42, 0.15);
}

/* Animations */
@keyframes pulse {
  0% {
    transform: scale(0.95);
    opacity: 0.8;
  }
  100% {
    transform: scale(1.05);
    opacity: 1;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translate(-50%, -46%);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}