/* Design System Tokens */
:root {
  --bg-dark: #0f1117;
  --bg-panel: #161922;
  --bg-card: #1f2330;
  --bg-hover: #2a2f40;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --accent: #ec4899;
  --accent-gradient: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #3b82f6 100%);
  
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --border-color: #2e3446;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Outfit', 'Noto Sans SC', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header Bar */
.header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
}

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

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #fff;
  box-shadow: 0 0 15px rgba(236, 72, 153, 0.4);
}

.brand-text h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.brand-text span {
  font-size: 12px;
  color: var(--text-muted);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed !important;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-hover);
}

.btn-success {
  background-color: #10b981;
  color: #fff;
}
.btn-success:hover:not(:disabled) {
  background-color: #059669;
}

.btn-hero {
  background: var(--accent-gradient);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(236, 72, 153, 0.3);
}
.btn-hero:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(236, 72, 153, 0.5);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
}
.btn-outline:hover:not(:disabled) {
  background-color: var(--bg-hover);
}

.btn-block {
  width: 100%;
}

.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 16px; }
.ms-1 { margin-left: 4px; }
.text-accent { color: var(--accent); }

/* Dropdown */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 8px;
  width: 220px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  overflow: hidden;
  z-index: 200;
}

.dropdown-menu.show {
  display: flex;
}

.dropdown-menu button {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.dropdown-menu button:hover {
  background-color: var(--bg-hover);
  color: var(--primary);
}

/* Workspace Layout */
.workspace {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Left Sidebar Tabs */
.tool-sidebar {
  width: 80px;
  background-color: var(--bg-panel);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 0;
  gap: 12px;
}

.tool-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  transition: var(--transition);
}

.tool-tab i {
  font-size: 18px;
}

.tool-tab:hover {
  color: var(--text-main);
  background-color: var(--bg-card);
}

.tool-tab.active {
  color: #fff;
  background: var(--accent-gradient);
  box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

/* Option Sub-panel */
.option-panel {
  width: 280px;
  background-color: var(--bg-panel);
  border-right: 1px solid var(--border-color);
  padding: 20px;
  overflow-y: auto;
}

.panel-content {
  display: none;
}
.panel-content.active {
  display: block;
}

.panel-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 20px;
}

.divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 20px 0;
}

.option-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* Form Controls */
.control-group {
  margin-bottom: 16px;
}

.control-group label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.control-group input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
}

.control-group input[type="text"] {
  width: 100%;
  padding: 10px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 14px;
}

.control-group input[type="color"] {
  width: 100%;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  cursor: pointer;
}

.range-val {
  font-size: 12px;
  color: var(--primary);
  float: right;
  margin-top: 4px;
}

/* Grids & Cards */
.filter-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.filter-card {
  padding: 14px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  text-align: center;
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-card:hover, .filter-card.active {
  border-color: var(--primary);
  background-color: rgba(99, 102, 241, 0.15);
  color: var(--primary);
}

.crop-ratios {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.btn-chip {
  padding: 6px 12px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-chip:hover, .btn-chip.active {
  background-color: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-group {
  display: flex;
  gap: 8px;
}

.btn-group .btn {
  flex: 1;
  padding: 8px 6px;
  font-size: 12px;
}

.color-palette {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}

.color-dot {
  aspect-ratio: 1;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
}

.color-dot.transparent {
  background: repeating-conic-gradient(#333 0% 25%, #222 0% 50%) 50% / 12px 12px;
}

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

.gradient-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.gradient-card {
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
  cursor: pointer;
  transition: var(--transition);
}

.gradient-card:hover {
  transform: scale(1.02);
}

.sticker-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.sticker-item {
  aspect-ratio: 1;
  font-size: 28px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.sticker-item:hover {
  transform: scale(1.2);
  background-color: var(--bg-hover);
}

/* Canvas Stage */
.canvas-stage {
  flex: 1;
  background-color: var(--bg-dark);
  background-image: radial-gradient(rgba(255,255,255,0.05) 1px, transparent 0);
  background-size: 24px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 40px;
}

.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.upload-dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  background-color: rgba(22, 25, 34, 0.5);
  backdrop-filter: blur(10px);
  max-width: 500px;
  width: 100%;
  transition: var(--transition);
}

.upload-dropzone:hover {
  border-color: var(--primary);
  background-color: rgba(22, 25, 34, 0.8);
}

.drop-icon {
  font-size: 48px;
  color: var(--primary);
  margin-bottom: 16px;
}

.upload-dropzone h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.upload-dropzone p {
  font-size: 13px;
  color: var(--text-muted);
}

.canvas-wrapper {
  position: relative;
  max-width: 100%;
  max-height: 100%;
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

#main-canvas {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 120px);
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(6px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 300;
}

.loading-overlay.show {
  display: flex;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255,255,255,0.1);
  border-left-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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