:root {
  /* Colors */
  --bg-base: #0a0a0f;
  --bg-surface: rgba(20, 20, 30, 0.85);
  --bg-surface-solid: #14141e;
  --bg-panel: rgba(15, 15, 20, 0.95);
  
  --accent-primary: #4a9eff;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  --accent-hover: #5ba8ff;
  
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  
  --border-light: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(74, 158, 255, 0.4);
  
  --status-success: #22c55e;
  --status-warning: #f59e0b;
  --status-error: #ef4444;
  
  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  
  /* Borders */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.2);
  --shadow-md: 0 8px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 16px 32px rgba(0,0,0,0.4), 0 0 0 1px var(--border-light) inset;
  --shadow-glow: 0 0 15px rgba(74, 158, 255, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  
  /* Z-index */
  --z-canvas: 1;
  --z-card: 10;
  --z-toolbar: 100;
  --z-minimap: 90;
  --z-panel: 200;
  --z-modal: 300;
}

/* CSS Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  scroll-behavior: smooth;
  font-size: 14px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Utilities */
.hidden { display: none !important; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* Animations */
@keyframes pulse-border {
  0% { box-shadow: 0 0 0 1px var(--border-light), 0 0 5px rgba(139, 92, 246, 0.2); }
  50% { box-shadow: 0 0 0 1px var(--accent-primary), 0 0 15px rgba(74, 158, 255, 0.6); }
  100% { box-shadow: 0 0 0 1px var(--border-light), 0 0 5px rgba(139, 92, 246, 0.2); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes success-glow {
  0% { box-shadow: 0 0 0 1px var(--status-success), 0 0 20px rgba(34, 197, 94, 0.6); }
  100% { box-shadow: 0 0 0 1px var(--border-light), 0 8px 16px rgba(0,0,0,0.3); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slide-in-right {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

/* Toolbar */
.toolbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--bg-panel);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  z-index: var(--z-toolbar);
}

.toolbar-left, .toolbar-center, .toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.toolbar-center {
  gap: var(--space-2);
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.5px;
}

.btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn.primary {
  background: var(--accent-gradient);
  border: none;
}

.btn.primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn.primary:active {
  transform: translateY(1px);
}

.btn.icon-only {
  padding: var(--space-2);
  border-radius: var(--radius-md);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-muted);
}
.status-indicator[data-status="connected"] .status-dot { background-color: var(--status-success); box-shadow: 0 0 8px var(--status-success); }
.status-indicator[data-status="configuring"] .status-dot { background-color: var(--status-warning); box-shadow: 0 0 8px var(--status-warning); }
.status-indicator[data-status="error"] .status-dot { background-color: var(--status-error); box-shadow: 0 0 8px var(--status-error); }

/* Canvas Viewport */
.canvas-viewport {
  position: absolute;
  top: 56px; /* Below toolbar */
  bottom: 0;
  left: 0;
  right: 0;
  overflow: hidden;
  cursor: grab;
  /* Grid pattern */
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.03) 1px, transparent 1px);
}

.canvas-viewport:active {
  cursor: grabbing;
}

.canvas-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform-origin: 0 0;
  will-change: transform;
  z-index: var(--z-canvas);
}

/* Image Cards */
.image-card {
  position: absolute;
  width: 380px;
  min-width: 320px;
  max-width: 800px;
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  z-index: var(--z-card);
  transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.image-card.generating {
  animation: pulse-border 2s infinite;
}

.image-card.success {
  animation: success-glow 1.5s ease-out;
}

.image-card.error {
  border-color: var(--status-error);
}

.image-card.minimized .card-body {
  display: none;
}

.card-header {
  padding: var(--space-3) var(--space-4);
  cursor: grab;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0,0,0,0.2);
  border-top-left-radius: var(--radius-md);
  border-top-right-radius: var(--radius-md);
}

.card-header:active {
  cursor: grabbing;
}

.card-title {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  width: 100%;
  outline: none;
}
.card-title:focus {
  color: var(--accent-primary);
}

.card-controls {
  display: flex;
  gap: var(--space-1);
}

.card-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.card-btn:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
}
.card-close:hover {
  background: rgba(239, 68, 68, 0.2);
  color: var(--status-error);
}

.card-body {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* Form Controls */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.input-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.prompt-input {
  width: 100%;
  min-height: 80px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: var(--space-2) var(--space-3);
  font-family: inherit;
  font-size: 0.9rem;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast);
}

.prompt-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--border-focus);
}

.negative-prompt {
  /* Default hidden state or toggle handled by JS */
}

.settings-row {
  display: flex;
  gap: var(--space-3);
}
.settings-row .input-group {
  flex: 1;
}

select.form-control {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: var(--space-2) var(--space-3);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  appearance: none;
}
select.form-control:focus {
  border-color: var(--accent-primary);
}

/* Generate Button */
.generate-btn {
  width: 100%;
  padding: var(--space-3);
  background: var(--accent-gradient);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}
.generate-btn:active {
  transform: translateY(0);
}

.generate-btn.loading {
  opacity: 0.8;
  cursor: not-allowed;
  transform: none;
}
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Image Preview */
.image-preview {
  width: 100%;
  aspect-ratio: 1/1; /* overridden by JS based on setting */
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: rgba(0,0,0,0.4);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-preview.placeholder {
  border: 2px dashed var(--border-light);
}

.placeholder-text {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.image-preview.loading {
  background: linear-gradient(90deg, rgba(255,255,255,0.03) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.03) 75%);
  background-size: 400% 100%;
  animation: shimmer 2s infinite;
}

.image-preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.action-bar {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
  padding-top: var(--space-2);
  border-top: 1px solid var(--border-light);
}

.action-bar .card-btn {
  width: 32px;
  height: 32px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-light);
}
.action-bar .card-btn:hover {
  background: rgba(255,255,255,0.1);
  color: var(--accent-primary);
  border-color: rgba(74, 158, 255, 0.4);
}

/* API Config Panel */
.api-panel {
  position: fixed;
  top: 56px;
  right: 0;
  bottom: 0;
  width: 360px;
  background: var(--bg-panel);
  backdrop-filter: blur(16px);
  border-left: 1px solid var(--border-light);
  box-shadow: -10px 0 30px rgba(0,0,0,0.5);
  z-index: var(--z-panel);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.api-panel.open {
  transform: translateX(0);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: var(--space-4);
}

.panel-title {
  font-size: 1.2rem;
  font-weight: 600;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-group input[type="password"],
.form-group input[type="text"] {
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  color: var(--text-primary);
  outline: none;
}
.form-group input:focus {
  border-color: var(--accent-primary);
}

/* Minimap */
.minimap {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 200px;
  height: 150px;
  background: rgba(10, 10, 15, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  z-index: var(--z-minimap);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.minimap-viewport-indicator {
  position: absolute;
  border: 1px solid var(--accent-primary);
  background: rgba(74, 158, 255, 0.1);
  pointer-events: none;
}

.minimap-node {
  position: absolute;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.9);
  backdrop-filter: blur(5px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.lightbox.active {
  opacity: 1;
  pointer-events: auto;
}

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
}

.lightbox-close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  background: rgba(255,255,255,0.1);
  border: none;
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: background var(--transition-fast);
}
.lightbox-close:hover {
  background: rgba(255,255,255,0.2);
}

/* ========== Additional Rules for HTML Integration ========== */

/* Toolbar branding */
.toolbar-logo {
  font-size: 1.4rem;
}
.toolbar-title {
  font-weight: 700;
  font-size: 1.1rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.5px;
  margin: 0;
}

/* Button variants */
.btn-primary {
  background: var(--accent-gradient) !important;
  border: none !important;
  color: white;
}
.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}
.btn-accent {
  background: linear-gradient(135deg, var(--status-success), #059669) !important;
  border: none !important;
  color: white;
}
.btn-accent:hover {
  box-shadow: 0 0 15px rgba(34, 197, 94, 0.4);
  transform: translateY(-1px);
}
.btn-secondary {
  background: rgba(56, 189, 248, 0.15) !important;
  border: 1px solid rgba(56, 189, 248, 0.35) !important;
  color: #38bdf8 !important;
}
.btn-secondary:hover {
  background: rgba(56, 189, 248, 0.28) !important;
  border-color: #38bdf8 !important;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.35);
  transform: translateY(-1px);
}
.btn-danger {
  background: transparent;
  border-color: rgba(239, 68, 68, 0.3) !important;
  color: var(--status-error);
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: var(--status-error) !important;
}
.btn-ghost {
  background: transparent;
  border-color: transparent !important;
  color: var(--text-secondary);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06) !important;
  color: var(--text-primary);
}
.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.2rem;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}
.btn-icon:hover {
  color: var(--text-primary);
}

/* Status text indicators (used in toolbar) */
.status-connected {
  color: var(--status-success);
  font-size: 0.85rem;
  font-weight: 500;
}
.status-configured {
  color: #38bdf8; /* sky blue */
  font-size: 0.85rem;
  font-weight: 500;
}
.status-error {
  color: var(--status-error);
  font-size: 0.85rem;
  font-weight: 500;
}
.status-disconnected {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
}

/* 中转服务状态徽标（toolbar 内） */
.proxy-badge {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
  cursor: help;
}
.proxy-badge-on {
  color: #4ade80;
  background: rgba(74, 222, 128, 0.12);
  border: 1px solid rgba(74, 222, 128, 0.35);
}
/* 未启用：显示为琥珀色警示，鼠标悬停可看到确切原因与处置办法 */
.proxy-badge-off {
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.12);
  border: 1px solid rgba(251, 191, 36, 0.35);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 2px;
}

/* Compliance Banner */
.compliance-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(14, 165, 233, 0.25);
  border-radius: var(--radius-sm);
  color: #e0f2fe;
}
.compliance-icon {
  font-size: 1.25rem;
  line-height: 1;
}
.compliance-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.compliance-text strong {
  font-size: 0.85rem;
  color: #38bdf8;
}
.compliance-text small {
  font-size: 0.72rem;
  color: #94a3b8;
  line-height: 1.35;
}
.compliance-text code {
  color: #f1f5f9;
  background: rgba(0, 0, 0, 0.4);
  padding: 1px 4px;
  border-radius: 3px;
}

.form-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.btn-link {
  background: none;
  border: none;
  color: var(--accent-primary);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0;
  transition: color var(--transition-fast);
}
.btn-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.compliance-tag {
  color: #38bdf8 !important;
  opacity: 0.85 !important;
}

/* API Panel inner layout */
.api-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: var(--space-4);
}
.api-panel-header h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0;
}
.api-panel-body {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.api-panel-footer {
  display: flex;
  gap: var(--space-2);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-light);
}
.api-panel-footer .btn {
  flex: 1;
  justify-content: center;
}

/* Form controls for API panel */
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast);
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--border-focus);
}
.form-select {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a0a0b0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}
.form-select option {
  background: #14141e;
  color: var(--text-primary);
}
.form-textarea {
  resize: vertical;
  min-height: 80px;
  font-family: 'Courier New', monospace;
  font-size: 0.82rem;
}

/* Keyboard shortcuts hint bar */
.shortcuts-hint {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 28px;
  background: rgba(10, 10, 15, 0.85);
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  font-size: 0.75rem;
  color: var(--text-muted);
  z-index: var(--z-toolbar);
}
.shortcuts-hint span {
  opacity: 0.7;
}
.shortcuts-hint .privacy-badge {
  opacity: 1;
  color: #4ade80;
  font-weight: 500;
  margin-left: auto;
  padding-right: var(--space-4);
}

/* Privacy notice in API panel */
.privacy-notice {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: rgba(74, 222, 128, 0.08);
  border: 1px solid rgba(74, 222, 128, 0.2);
  border-radius: var(--radius-sm);
  color: #86efac;
  font-size: 0.8rem;
  line-height: 1.5;
}

/* Responsive Overrides */
@media (max-width: 768px) {
  .toolbar {
    padding: 0 var(--space-2);
  }
  .toolbar-center .btn span {
    display: none;
  }
  .image-card {
    width: 320px;
  }
  .api-panel {
    width: 100%;
  }
  .minimap {
    display: none;
  }
  .shortcuts-hint {
    display: none;
  }
}