/* ==========================================================================
   Local Image Toolkit — Modern Design System (Light / Dark Theme Support)
   ========================================================================== */

/* --- CSS Variables & Theme Definitions --- */
:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-base: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-active: #4338ca;
  --accent-rgb: 99, 102, 241;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
  --warning: #f59e0b;
  --info: #06b6d4;
}

/* Dark Theme (Default) */
[data-theme="dark"] {
  --bg-canvas: #090d16;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(24, 34, 53, 0.85);
  --bg-input: #121927;
  --bg-input-hover: #172033;
  --bg-elevated: #1e293b;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.05);
  --border-focus: #6366f1;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #0f172a;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px -8px rgba(0, 0, 0, 0.6);
  --shadow-accent: 0 8px 25px -4px rgba(99, 102, 241, 0.45);

  --glow-1: rgba(99, 102, 241, 0.14);
  --glow-2: rgba(139, 92, 246, 0.10);

  --checker-a: #161e2e;
  --checker-b: #0f1420;
}

/* Light Theme */
[data-theme="light"] {
  --bg-canvas: #f6f8fb;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #ffffff;
  --bg-input: #f1f5f9;
  --bg-input-hover: #e2e8f0;
  --bg-elevated: #ffffff;
  
  --border-color: #e2e8f0;
  --border-light: #edf2f7;
  --border-focus: #6366f1;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --text-inverse: #ffffff;

  --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 35px -10px rgba(15, 23, 42, 0.12);
  --shadow-accent: 0 8px 25px -4px rgba(99, 102, 241, 0.35);

  --glow-1: rgba(99, 102, 241, 0.08);
  --glow-2: rgba(217, 70, 239, 0.06);

  --checker-a: #e2e8f0;
  --checker-b: #f8fafc;
}

/* --- Global Reset & Foundation --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  padding: 32px 24px 60px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Ambient Background Lighting */
.ambient-glow {
  position: fixed;
  width: 550px;
  height: 550px;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  transition: opacity var(--transition-base);
}
.ambient-glow-1 {
  top: -120px;
  right: -80px;
  background: var(--glow-1);
}
.ambient-glow-2 {
  bottom: 50px;
  left: -120px;
  background: var(--glow-2);
}

/* Container */
.app-container {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  z-index: 1;
}

/* --- Header --- */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-icon-wrapper {
  position: relative;
}

.brand-icon {
  background: var(--accent-gradient);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-accent);
  transition: transform var(--transition-base);
}

.brand-icon:hover {
  transform: rotate(4deg) scale(1.05);
}

.brand-badge-offline {
  position: absolute;
  bottom: -6px;
  right: -8px;
  background: #10b981;
  color: #ffffff;
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  padding: 1px 5px;
  border-radius: 999px;
  border: 2px solid var(--bg-card);
}

.brand-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-title {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.version-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--accent);
  font-family: var(--font-mono);
}

.brand-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 0 rgba(16, 185, 129, 0.4);
  animation: pulse 2s infinite cubic-bezier(0.66, 0, 0, 1);
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* --- Light / Dark Theme Toggle Button --- */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.theme-toggle-btn:hover {
  background: var(--bg-input-hover);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.theme-icon-container {
  position: relative;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-icon {
  position: absolute;
  transition: opacity var(--transition-base), transform var(--transition-base);
}

/* Dark mode active icons */
[data-theme="dark"] .sun-icon {
  opacity: 1;
  transform: rotate(0) scale(1);
  color: #fbbf24;
}
[data-theme="dark"] .moon-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

/* Light mode active icons */
[data-theme="light"] .sun-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}
[data-theme="light"] .moon-icon {
  opacity: 1;
  transform: rotate(0) scale(1);
  color: #4f46e5;
}

/* --- Tools Navigation (Segmented Control Tabs) --- */
.tools-nav {
  display: flex;
  gap: 8px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  padding: 6px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.tab-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex: 1;
  padding: 12px 20px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.tab-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

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

.tab-btn:hover .tab-icon-wrap {
  transform: translateY(-1px);
}

.tab-btn.active {
  color: #ffffff;
  background: var(--accent-gradient);
  box-shadow: var(--shadow-accent);
}

.tab-tag {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.tab-btn:not(.active) .tab-tag {
  background: var(--bg-input);
  color: var(--text-dim);
  border: 1px solid var(--border-color);
}

.tab-btn:not(.active) .ai-tag {
  color: #a855f7;
  background: rgba(168, 85, 247, 0.1);
  border-color: rgba(168, 85, 247, 0.25);
}

/* --- Workspace Layout Grid --- */
.workspace-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 900px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

/* Card System */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

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

.card-title {
  font-size: 1.22rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.card-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.badge-count {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

/* --- Drop Zone --- */
.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 20px;
  text-align: center;
  cursor: pointer;
  background: var(--bg-input);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.drop-zone:hover {
  border-color: var(--accent);
  background: var(--bg-input-hover);
  transform: translateY(-2px);
}

.drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
  box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.2);
  transform: scale(1.01);
}

.file-input-hidden {
  display: none;
}

.upload-icon-container {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  border-radius: var(--radius-lg);
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.drop-zone:hover .upload-icon-container {
  background: var(--accent);
  color: #ffffff;
  transform: scale(1.1) rotate(-4deg);
  box-shadow: var(--shadow-accent);
}

.drop-zone-main {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.browse-link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1.5px solid var(--accent);
  padding-bottom: 1px;
  transition: opacity var(--transition-fast);
}

.browse-link:hover {
  opacity: 0.8;
}

.drop-zone-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  max-width: 380px;
  margin: 0 auto 16px;
}

.format-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.format-pill {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* --- Queue List --- */
.queue-list-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 4px;
}

.queue-actions-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.queue-heading {
  display: flex;
  align-items: center;
  gap: 8px;
}

.queue-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
}

.queue-total-size {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.btn-ghost-danger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  color: var(--danger);
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
}

.btn-ghost-danger:hover {
  background: var(--danger-bg);
}

.queue-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 290px;
  overflow-y: auto;
  padding-right: 6px;
}

.queue-items::-webkit-scrollbar {
  width: 5px;
}
.queue-items::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 999px;
}

.queue-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.queue-item:hover {
  border-color: var(--border-focus);
  background: var(--bg-input-hover);
}

.queue-thumb {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: #000;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}

.queue-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.queue-name {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.queue-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.74rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.queue-remove-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.queue-remove-btn:hover {
  color: var(--danger);
  background: var(--danger-bg);
  transform: scale(1.1);
}

/* --- Settings Panel Forms --- */
.tool-settings-form {
  display: none;
  flex-direction: column;
  gap: 20px;
}

.tool-settings-form.active {
  display: flex;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.form-hint {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
}

.field-note {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: '';
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

.form-select,
.form-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  outline: none;
  transition: all var(--transition-fast);
  appearance: none;
}

.form-select:hover,
.form-input:hover {
  background: var(--bg-input-hover);
}

.form-select:focus,
.form-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.18);
  background: var(--bg-elevated);
}

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

.range-val-badge {
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--accent);
}

.range-slider-wrapper {
  padding: 4px 0;
}

.form-range {
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: var(--bg-input);
  accent-color: var(--accent);
  cursor: pointer;
}

.form-row {
  display: flex;
  gap: 14px;
}

.form-group.col {
  flex: 1;
}

.input-with-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-unit .form-input {
  padding-right: 40px;
}

.input-unit {
  position: absolute;
  right: 14px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-dim);
  pointer-events: none;
  font-family: var(--font-mono);
}

/* Switch Toggle */
.switch-group {
  padding: 8px 0;
}

.switch-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.switch-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.switch-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
}

.switch-desc {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.switch-input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  transition: var(--transition-fast);
  border-radius: 999px;
}

.switch-slider::before {
  position: absolute;
  content: '';
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-muted);
  transition: var(--transition-fast);
  border-radius: 50%;
}

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

.switch-input:checked + .switch-slider::before {
  transform: translateX(20px);
  background-color: #ffffff;
}

/* Color Picker Card */
.color-picker-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: var(--radius-md);
}

.form-color-circle {
  -webkit-appearance: none;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  background: none;
  padding: 0;
  flex-shrink: 0;
}

.form-color-circle::-webkit-color-swatch-wrapper {
  padding: 0;
}

.form-color-circle::-webkit-color-swatch {
  border: 2px solid var(--border-color);
  border-radius: 50%;
}

.color-picker-info {
  display: flex;
  flex-direction: column;
}

.color-hex-code {
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-main);
}

.color-subtext {
  font-size: 0.74rem;
  color: var(--text-muted);
}

/* --- Compressor Preset Cards --- */
.preset-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (max-width: 600px) {
  .preset-grid {
    grid-template-columns: 1fr;
  }
}

.preset-card {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--bg-input);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-card input {
  display: none;
}

.preset-indicator {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--text-dim);
  margin-top: 2px;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.preset-card.checked {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.08);
}

.preset-card.checked .preset-indicator {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.25);
}

.preset-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

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

.preset-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.preset-badge-rec {
  font-size: 0.65rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.preset-desc {
  font-size: 0.74rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* --- AI Background Remover Cards --- */
.ai-engine-banner {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(168, 85, 247, 0.12) 100%);
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.ai-engine-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.ai-sparkle-icon {
  font-size: 1.3rem;
}

.ai-engine-details {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.ai-engine-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-engine-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
}

.ai-model-tag {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--accent);
  color: #ffffff;
  font-family: var(--font-mono);
}

.ai-engine-desc {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.bg-choice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 600px) {
  .bg-choice-grid {
    grid-template-columns: 1fr;
  }
}

.bg-choice-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 10px;
  cursor: pointer;
  background: var(--bg-input);
  transition: all var(--transition-fast);
}

.bg-choice-card input {
  display: none;
}

.bg-choice-card.checked {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.08);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.bg-choice-preview-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.checker-pattern {
  background-image: linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
                    linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
                    linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
                    linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
  background-size: 10px 10px;
  background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
  background-color: var(--checker-b);
}

.solid-color-preview {
  background-color: #3b82f6;
}

.custom-image-preview {
  background: var(--bg-card);
  color: var(--accent);
}

.bg-choice-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2px;
}

.bg-choice-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-main);
}

.bg-choice-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* --- Action Process Button --- */
.process-action-wrapper {
  margin-top: 10px;
}

.btn-primary {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  padding: 15px 24px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-accent);
  overflow: hidden;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px -4px rgba(var(--accent-rgb), 0.6);
}

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
  filter: grayscale(40%);
}

/* Button Shine Effect */
.btn-shine {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: left 0.75s ease;
  pointer-events: none;
}
.btn-primary:hover:not(:disabled) .btn-shine {
  left: 100%;
}

/* --- Progress Bar Indicator --- */
.progress-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: var(--radius-md);
  animation: fadeIn 0.2s ease;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-status-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
}

.progress-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(var(--accent-rgb), 0.3);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.progress-status {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-main);
}

.progress-percent {
  font-size: 0.84rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent);
}

.progress-bar-track {
  height: 8px;
  background: var(--bg-canvas);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  background-size: 30px 30px;
  background-image: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.2) 50%, rgba(255, 255, 255, 0.2) 75%, transparent 75%, transparent);
  animation: moveStripes 1s linear infinite;
}

@keyframes moveStripes {
  from { background-position: 0 0; }
  to { background-position: 30px 0; }
}

/* --- Results Section --- */
.results-section {
  display: flex;
  flex-direction: column;
  gap: 22px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.35s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.results-heading-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.results-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.results-badge-success {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: var(--success-bg);
  color: var(--success);
}

.results-summary {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-top: 2px;
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #ffffff;
  border: none;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-accent);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-outline:hover {
  background: var(--bg-input-hover);
  border-color: var(--accent);
}

/* Results Cards Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 22px;
}

.result-card {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.result-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.result-preview-container {
  position: relative;
  height: 220px;
  background: var(--bg-canvas);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  cursor: pointer;
}

.result-preview-container.checker-bg {
  background-image: linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
                    linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
                    linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
                    linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
  background-size: 14px 14px;
  background-position: 0 0, 0 7px, 7px -7px, -7px 0px;
  background-color: var(--checker-b);
}

.result-img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  transition: transform var(--transition-base);
}

.result-preview-container:hover .result-img {
  transform: scale(1.05);
}

.result-preview-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 600;
  gap: 6px;
}

.result-preview-container:hover .result-preview-overlay {
  opacity: 1;
}

.result-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.result-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.result-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 210px;
}

.badge-format {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  font-size: 0.72rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.result-submeta {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.stats-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--success-bg);
  color: var(--success);
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.result-actions-row {
  display: flex;
  gap: 8px;
  margin-top: auto;
  padding-top: 4px;
}

.btn-card-download {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: #ffffff;
  padding: 10px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn-card-download:hover {
  background: var(--accent-hover);
}

.btn-card-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-card-preview:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

/* --- Modal Preview Lightbox --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

.modal-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-title-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.modal-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.modal-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-modal-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-modal-download:hover {
  background: var(--accent-hover);
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--text-main);
  background: var(--bg-input);
}

.modal-body-preview {
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-canvas);
  overflow: auto;
  max-height: 70vh;
}

.modal-preview-img {
  max-width: 100%;
  max-height: 65vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
}

/* --- Toast Notifications --- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1100;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: slideInToast 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  transition: all 0.3s ease;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

@keyframes slideInToast {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* --- Responsive Mobile Optimization --- */
@media (max-width: 768px) {
  body {
    padding: 16px 12px 40px;
  }

  .app-header {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    padding: 16px;
  }

  .header-controls {
    justify-content: space-between;
    width: 100%;
  }

  .tools-nav {
    flex-direction: column;
  }

  .tab-btn {
    justify-content: flex-start;
  }

  .tab-tag {
    margin-left: auto;
  }

  .form-row {
    flex-direction: column;
  }

  .results-grid {
    grid-template-columns: 1fr;
  }

  .results-header {
    flex-direction: column;
    align-items: stretch;
  }

  .results-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn-secondary,
  .btn-outline {
    width: 100%;
    justify-content: center;
  }
}