/* ==========================================================================
   MarkItDown Web Studio - Modern Design System & Styles
   ========================================================================== */

:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-main: #0a0c13;
  --bg-surface: rgba(18, 22, 36, 0.75);
  --bg-surface-solid: #121624;
  --bg-surface-elevated: rgba(28, 34, 54, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.35);
  
  /* Accent Gradients */
  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #0ea5e9;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #0ea5e9 100%);
  --accent-gradient-glow: linear-gradient(135deg, rgba(99, 102, 241, 0.3) 0%, rgba(14, 165, 233, 0.3) 100%);
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;

  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Shadows & Glassmorphism */
  --glass-blur: blur(16px);
  --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.5), 0 0 0 1px var(--border-subtle);
  --card-shadow-hover: 0 16px 40px -5px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--border-glow);
  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --border-radius-lg: 16px;
  --border-radius-md: 10px;
  --border-radius-sm: 6px;
}

[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.85);
  --bg-surface-solid: #ffffff;
  --bg-surface-elevated: rgba(241, 245, 249, 0.95);
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-glow: rgba(99, 102, 241, 0.4);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.06), 0 0 0 1px var(--border-subtle);
  --card-shadow-hover: 0 16px 35px -5px rgba(99, 102, 241, 0.15), 0 0 0 1px var(--border-glow);
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Background Ambient Glow */
.bg-glow {
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(120px);
  opacity: 0.25;
}

.bg-glow-1 {
  top: -100px;
  left: -100px;
  background: radial-gradient(circle, #6366f1 0%, transparent 70%);
}

.bg-glow-2 {
  bottom: -100px;
  right: -100px;
  background: radial-gradient(circle, #0ea5e9 0%, transparent 70%);
}

/* Layout Elements */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 24px;
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--border-radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-badge {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-secondary);
  background: rgba(14, 165, 233, 0.12);
  padding: 2px 8px;
  border-radius: 12px;
  display: inline-block;
  margin-top: 2px;
}

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

.btn-return {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-gradient);
  color: #ffffff;
  padding: 6px 14px;
  border-radius: var(--border-radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
  transition: var(--transition-smooth);
  white-space: nowrap;
}

.btn-return:hover {
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.55);
  transform: translateY(-2px);
  color: #ffffff;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-surface-elevated);
  padding: 5px 12px;
  border-radius: 20px;
  border: 1px solid var(--border-subtle);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success-color);
  box-shadow: 0 0 8px var(--success-color);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.btn-icon {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-icon:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* Main Content Area */
.main-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 30px 24px 60px;
  position: relative;
  z-index: 10;
}

.hero-section {
  text-align: center;
  margin-bottom: 28px;
}

.hero-title {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 0.98rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* Tabs */
.tabs-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.tab-list {
  display: flex;
  background: var(--bg-surface-elevated);
  padding: 4px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-subtle);
  gap: 4px;
}

.tab-button {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.tab-button:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.tab-button.active {
  color: #ffffff;
  background: var(--accent-gradient);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.tab-panel {
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Cards & Layout Grid */
.card {
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.workspace-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 20px;
  min-height: 560px;
}

/* Panel Upload */
.panel-upload {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.panel-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.panel-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.file-limits {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border-subtle);
  border-radius: var(--border-radius-md);
  padding: 30px 16px;
  text-align: center;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.015);
  transition: var(--transition-smooth);
  position: relative;
  margin-bottom: 16px;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.06);
  transform: scale(1.01);
}

.dropzone-icon {
  color: var(--accent-secondary);
  margin-bottom: 10px;
  display: inline-block;
  transition: transform 0.3s ease;
}

.dropzone:hover .dropzone-icon {
  transform: translateY(-4px);
}

.dropzone-title {
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.dropzone-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.file-input-hidden {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

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

.format-pills span {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

/* Selected File Card */
.selected-file-card {
  display: flex;
  align-items: center;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  padding: 12px;
  margin-bottom: 16px;
  gap: 12px;
  animation: fadeIn 0.25s ease;
}

.file-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-sm);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.file-info-text {
  flex-grow: 1;
  overflow: hidden;
}

.file-name {
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}

.file-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.btn-remove-file {
  background: transparent;
  border: none;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: color 0.2s ease;
}

.btn-remove-file:hover {
  color: var(--danger-color);
}

/* Progress Bar */
.progress-container {
  margin-bottom: 16px;
  animation: fadeIn 0.25s ease;
}

.progress-bar-wrapper {
  width: 100%;
  height: 8px;
  background: var(--bg-surface-elevated);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 6px;
}

.progress-bar-animated {
  width: 100%;
  height: 100%;
  background: var(--accent-gradient);
  background-size: 200% 100%;
  animation: progressPulse 1.5s infinite linear;
}

@keyframes progressPulse {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.progress-status-label {
  font-size: 0.78rem;
  color: var(--accent-secondary);
  font-weight: 500;
}

/* Action Buttons */
.action-buttons-group {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--border-radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: none;
}

.btn-full {
  width: 100%;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
  transform: translateY(-2px);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

/* Panel Result & Preview */
.panel-result {
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
}

.result-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.015);
  flex-wrap: wrap;
  gap: 10px;
}

.view-toggle-group {
  display: flex;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-sm);
  padding: 2px;
}

.toggle-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.toggle-btn.active {
  background: var(--bg-surface-solid);
  color: var(--accent-secondary);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.result-meta-stats {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.result-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: var(--border-radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-action:hover:not(:disabled) {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.12);
  transform: translateY(-1px);
}

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

.btn-action-accent {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
}

.btn-action-accent:hover:not(:disabled) {
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.4);
}

.format-explainer-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(99, 102, 241, 0.08);
  border-bottom: 1px solid var(--border-subtle);
  padding: 8px 18px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.format-explainer-bar .info-icon {
  font-size: 0.95rem;
  flex-shrink: 0;
}

.format-explainer-bar strong {
  color: var(--text-primary);
}

.viewer-wrapper {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  height: 480px;
  position: relative;
}

.markdown-editor {
  width: 100%;
  height: 100%;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.7;
  padding: 20px;
  border: none;
  resize: none;
  outline: none;
  white-space: pre-wrap;
}

.rendered-markdown-content {
  width: 100%;
  height: 100%;
  overflow-y: auto;
  padding: 24px;
  color: var(--text-primary);
  line-height: 1.75;
}

/* Rendered Markdown Styling */
.rendered-markdown-content h1,
.rendered-markdown-content h2,
.rendered-markdown-content h3,
.rendered-markdown-content h4 {
  margin-top: 1.4em;
  margin-bottom: 0.6em;
  font-weight: 700;
  line-height: 1.3;
}

.rendered-markdown-content h1 {
  font-size: 1.7rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 8px;
}

.rendered-markdown-content h2 {
  font-size: 1.35rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 6px;
}

.rendered-markdown-content p {
  margin-bottom: 1em;
}

.rendered-markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.rendered-markdown-content th,
.rendered-markdown-content td {
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--border-subtle);
}

.rendered-markdown-content th {
  background: var(--bg-surface-elevated);
  font-weight: 600;
}

.rendered-markdown-content tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.015);
}

.rendered-markdown-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-secondary);
  padding: 2px 6px;
  border-radius: 4px;
}

.rendered-markdown-content pre {
  background: var(--bg-surface-elevated);
  padding: 16px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  margin: 1em 0;
}

.rendered-markdown-content pre code {
  background: transparent;
  padding: 0;
  color: var(--text-primary);
}

.rendered-markdown-content blockquote {
  border-left: 4px solid var(--accent-primary);
  padding-left: 16px;
  color: var(--text-secondary);
  margin: 1em 0;
  font-style: italic;
}

.empty-state-notice {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
}

/* TAB 2: Batch Layout */
.batch-card {
  padding: 24px;
}

.batch-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 15px;
}

.batch-top-actions {
  display: flex;
  gap: 10px;
}

.batch-dropzone {
  margin-bottom: 24px;
}

.batch-queue-container {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.queue-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.table-responsive {
  max-height: 380px;
  overflow-y: auto;
}

.batch-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.batch-table th {
  text-align: left;
  padding: 10px 16px;
  background: rgba(0, 0, 0, 0.15);
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-subtle);
}

.batch-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.batch-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.badge-status {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 12px;
}

.badge-pending {
  background: rgba(148, 163, 184, 0.15);
  color: var(--text-secondary);
}

.badge-processing {
  background: rgba(14, 165, 233, 0.2);
  color: var(--accent-secondary);
}

.badge-success {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success-color);
}

.badge-error {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger-color);
}

/* TAB 3: Docs & Formats */
.docs-container {
  padding: 10px;
}

.docs-intro {
  margin-bottom: 24px;
}

.docs-intro h3 {
  font-size: 1.3rem;
  margin-bottom: 6px;
}

.docs-intro p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.formats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.format-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  padding: 18px;
  transition: var(--transition-smooth);
}

.format-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.format-card-icon {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 4px 8px;
  border-radius: 6px;
  color: #fff;
  margin-bottom: 12px;
}

.docx-color { background: #2563eb; }
.pdf-color { background: #dc2626; }
.xlsx-color { background: #16a34a; }
.pptx-color { background: #ea580c; }
.html-color { background: #0891b2; }
.csv-color { background: #7c3aed; }

.format-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.format-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.tips-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--border-radius-md);
  padding: 18px 22px;
}

.tips-box h4 {
  font-size: 0.98rem;
  margin-bottom: 10px;
}

.tips-box ul {
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.tips-box li {
  margin-bottom: 8px;
}

.tips-box code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  color: var(--accent-secondary);
}

.tips-box a {
  color: var(--accent-secondary);
  text-decoration: none;
  transition: var(--transition-smooth);
}

.tips-box a:hover {
  text-decoration: underline;
  filter: brightness(1.2);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #1e293b;
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--border-radius-md);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 100;
  animation: slideToast 0.3s ease;
  font-size: 0.88rem;
}

.toast-icon {
  background: var(--success-color);
  color: #fff;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

@keyframes slideToast {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 24px;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.footer-credit {
  margin-top: 6px;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.credit-link {
  color: var(--accent-secondary);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-smooth);
}

.credit-link:hover {
  text-decoration: underline;
  color: #38bdf8;
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Responsive Media Queries */
@media (max-width: 960px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 1.7rem;
  }
}

@media (max-width: 600px) {
  .header-container {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }
  .header-actions {
    align-self: flex-end;
  }
  .tab-list {
    flex-direction: column;
    width: 100%;
  }
  .result-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .result-actions {
    width: 100%;
    justify-content: flex-end;
  }
  .ai-comparison-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================
   AI Token Optimization Section Styling
   ========================================== */
.ai-token-section {
  margin-bottom: 28px;
}

.ai-token-card {
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-glow);
  box-shadow: 0 12px 36px -10px rgba(99, 102, 241, 0.15), var(--card-shadow);
  padding: 24px 28px;
  transition: var(--transition-smooth);
}

.ai-token-card.collapsed {
  padding: 16px 24px;
}

.ai-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  user-select: none;
}

.header-left {
  flex-grow: 1;
}

.btn-toggle-explain {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  padding: 8px 16px;
  border-radius: var(--border-radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

.btn-toggle-explain:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

.toggle-icon {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.ai-token-card.collapsed .toggle-icon {
  transform: rotate(180deg);
}

.ai-token-card.collapsed .btn-toggle-explain {
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.ai-card-body {
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease, margin 0.3s ease;
  max-height: 1400px;
  opacity: 1;
  overflow: hidden;
  margin-top: 18px;
}

.ai-card-body.collapsed {
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  pointer-events: none;
}

.ai-badge-group {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.ai-pill-badge {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(14, 165, 233, 0.2) 100%);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.4);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.ai-pill-save {
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.35);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
  animation: pulse-dot 2.5s infinite;
}

.ai-card-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
}

.ai-card-subtitle {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.ai-comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 14px;
}

.comparison-col {
  border-radius: var(--border-radius-md);
  padding: 20px;
  border: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.comparison-col:hover {
  transform: translateY(-2px);
}

.col-negative {
  background: rgba(239, 68, 68, 0.04);
  border-color: rgba(239, 68, 68, 0.25);
}

.col-positive {
  background: rgba(16, 185, 129, 0.04);
  border-color: rgba(16, 185, 129, 0.3);
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.08);
}

.col-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.col-header h4 {
  font-size: 0.98rem;
  font-weight: 700;
}

.col-negative .col-header h4 {
  color: #f87171;
}

.col-positive .col-header h4 {
  color: #34d399;
}

.status-icon-badge {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.78rem;
  flex-shrink: 0;
}

.badge-danger {
  background: #ef4444;
  color: #ffffff;
}

.badge-success {
  background: #10b981;
  color: #ffffff;
}

.comparison-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.comparison-list li strong {
  color: var(--text-primary);
}

.comparison-list code {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.08);
  padding: 1px 5px;
  border-radius: 4px;
  color: var(--accent-secondary);
}

/* AI Guide Box */
.ai-guide-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid #10b981;
  border-radius: var(--border-radius-md);
  padding: 20px 24px;
  margin-top: 20px;
}

.ai-guide-box h4 {
  font-size: 1.05rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.ai-guide-steps {
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.prompt-template-card {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-sm);
  padding: 14px 18px;
  margin-top: 8px;
}

.prompt-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.prompt-header span {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-copy-prompt {
  align-self: flex-start;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-copy-prompt:hover {
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.5);
  transform: translateY(-1px);
}

.prompt-code {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-primary);
  white-space: pre-wrap;
  line-height: 1.6;
  background: transparent;
  padding: 6px 0 0;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-secondary);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}

.ai-quick-tip {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(14, 165, 233, 0.2);
  border-radius: var(--border-radius-sm);
  padding: 10px 12px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-top: 4px;
}

.ai-quick-tip svg {
  color: var(--accent-secondary);
  flex-shrink: 0;
  margin-top: 2px;
}

.ai-quick-tip strong {
  color: var(--text-primary);
}

/* ==========================================================================
   RESPONSIVE DESIGN SYSTEM (MOBILE & TABLET ADAPTATION)
   ========================================================================== */

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

  .ai-comparison-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
}

@media (max-width: 768px) {
  /* Navbar Ringkas & Elegan (1 Baris) */
  .app-header {
    padding: 8px 14px;
    background: rgba(15, 23, 42, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

  [data-theme="light"] .app-header {
    background: rgba(255, 255, 255, 0.92);
  }

  .header-container {
    gap: 8px;
    flex-wrap: nowrap;
  }

  .brand-group {
    gap: 8px;
    min-width: 0;
    flex-shrink: 1;
  }

  .brand-icon {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    flex-shrink: 0;
  }

  .brand-icon svg {
    width: 18px;
    height: 18px;
  }

  .brand-title {
    font-size: 0.96rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .brand-badge {
    display: none; /* Sembunyikan badge panjang di header mobile agar tidak membungkus ke baris 2 */
  }

  .header-actions {
    gap: 6px;
    flex-shrink: 0;
    flex-wrap: nowrap;
  }

  .btn-return {
    padding: 6px 10px;
    font-size: 0.74rem;
    gap: 4px;
    border-radius: 6px;
  }

  .btn-return svg {
    width: 14px;
    height: 14px;
  }

  .status-indicator {
    padding: 6px 8px;
    border-radius: 6px;
  }

  .status-indicator span:not(.status-dot) {
    display: none; /* Sisakan lampu indikator dot glowing agar hemat tempat */
  }

  .btn-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
  }

  /* Main Container */
  .main-content {
    padding: 16px 12px 48px;
  }

  /* Hero Section */
  .hero-section {
    padding: 10px 0 16px;
  }

  .hero-tag {
    font-size: 0.72rem;
    padding: 3px 10px;
    margin-bottom: 8px;
  }

  .hero-title {
    font-size: 1.45rem;
    line-height: 1.25;
    margin-bottom: 10px;
    letter-spacing: -0.02em;
  }

  .hero-subtitle {
    font-size: 0.84rem;
    line-height: 1.48;
    padding: 0 4px;
  }

  /* Collapsible AI Explainer Card */
  .ai-token-card {
    padding: 14px 14px;
    border-radius: var(--border-radius-md);
  }

  .ai-token-card.collapsed {
    padding: 12px 14px;
  }

  .ai-card-header {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .ai-badge-group {
    gap: 6px;
    margin-bottom: 6px;
  }

  .ai-pill-badge, .ai-pill-save {
    font-size: 0.72rem;
    padding: 3px 9px;
  }

  .ai-card-title {
    font-size: 1.05rem;
    line-height: 1.32;
  }

  .btn-toggle-explain {
    width: 100%;
    justify-content: center;
    padding: 7px 12px;
    font-size: 0.78rem;
    border-radius: 6px;
  }

  .ai-card-subtitle {
    font-size: 0.82rem;
    line-height: 1.5;
  }

  .ai-comparison-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 12px;
  }

  .comparison-col {
    padding: 14px;
  }

  .col-header h4 {
    font-size: 0.92rem;
  }

  .comparison-list {
    font-size: 0.8rem;
    gap: 10px;
  }

  /* Segmented Tabs */
  .tabs-wrapper {
    margin-bottom: 16px;
  }

  .tab-list {
    width: 100%;
    flex-direction: column;
    gap: 4px;
    padding: 4px;
  }

  .tab-button {
    width: 100%;
    justify-content: flex-start;
    padding: 9px 14px;
    font-size: 0.82rem;
  }

  /* Panel Upload */
  .panel-upload {
    padding: 16px;
  }

  .panel-header {
    margin-bottom: 12px;
  }

  .panel-title {
    font-size: 1rem;
  }

  .dropzone {
    padding: 22px 12px;
    margin-bottom: 12px;
  }

  .dropzone-icon svg {
    width: 38px;
    height: 38px;
  }

  .dropzone-title {
    font-size: 0.92rem;
  }

  .dropzone-desc {
    font-size: 0.76rem;
    margin-bottom: 10px;
  }

  .format-pills {
    gap: 4px;
  }

  .format-pills span {
    font-size: 0.65rem;
    padding: 2px 6px;
  }

  .selected-file-card {
    padding: 10px;
    gap: 10px;
  }

  .file-name {
    max-width: 160px;
    font-size: 0.82rem;
  }

  .file-size {
    font-size: 0.72rem;
  }

  .btn-full {
    padding: 12px 16px;
    font-size: 0.92rem;
  }

  .ai-quick-tip {
    font-size: 0.74rem;
    padding: 8px 10px;
  }

  /* Panel Result & Toolbar */
  .panel-result {
    border-radius: var(--border-radius-md);
  }

  .result-toolbar {
    padding: 10px 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .view-toggle-group {
    width: 100%;
    display: flex;
  }

  .toggle-btn {
    flex: 1;
    justify-content: center;
    padding: 7px 8px;
    font-size: 0.78rem;
  }

  .result-meta-stats {
    text-align: center;
    font-size: 0.75rem;
  }

  .result-actions {
    width: 100%;
    display: flex;
    gap: 8px;
  }

  .result-actions .btn-action {
    flex: 1;
    justify-content: center;
    padding: 9px 8px;
    font-size: 0.78rem;
  }

  .result-actions .btn-action svg {
    width: 14px;
    height: 14px;
  }

  .result-editor {
    min-height: 280px;
    max-height: 380px;
    font-size: 0.82rem;
    padding: 12px;
  }

  .rendered-markdown-content {
    min-height: 280px;
    max-height: 380px;
    padding: 14px;
    font-size: 0.86rem;
  }

  /* Tabel Markdown Responsive dengan Horizontal Scroll */
  .rendered-markdown-content table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 12px 0;
  }

  .rendered-markdown-content th,
  .rendered-markdown-content td {
    padding: 6px 10px;
    font-size: 0.8rem;
    white-space: nowrap;
  }

  /* Batch Tab Responsiveness */
  .batch-card {
    padding: 16px;
  }

  .batch-header {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .batch-top-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
  }

  .batch-top-actions button {
    width: 100%;
    justify-content: center;
    padding: 9px 12px;
    font-size: 0.82rem;
  }

  .batch-dropzone {
    margin-bottom: 16px;
  }

  .batch-queue-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .batch-table {
    min-width: 480px;
  }

  .batch-table th, 
  .batch-table td {
    padding: 8px 10px;
    font-size: 0.78rem;
  }

  /* Docs & Formats Tab */
  .formats-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .format-card {
    padding: 14px;
  }

  .format-card h4 {
    font-size: 0.92rem;
  }

  .format-card p {
    font-size: 0.8rem;
  }

  .tips-box {
    padding: 14px;
  }

  .tips-box h4 {
    font-size: 0.88rem;
  }

  .tips-box ul {
    padding-left: 16px;
    font-size: 0.8rem;
  }

  .ai-guide-box {
    padding: 14px;
  }

  .ai-guide-box h4 {
    font-size: 0.88rem;
  }

  .ai-guide-steps {
    padding-left: 16px;
    font-size: 0.8rem;
  }

  .prompt-template-card {
    padding: 10px 12px;
  }

  .prompt-code {
    font-size: 0.76rem;
  }

  /* Toast Notification di Mobile */
  .toast {
    left: 50% !important;
    right: auto !important;
    transform: translateX(-50%);
    bottom: 20px;
    width: calc(100% - 32px);
    max-width: 360px;
    justify-content: center;
    font-size: 0.82rem;
    padding: 10px 16px;
  }

  /* Footer */
  .app-footer {
    padding: 24px 12px;
    font-size: 0.75rem;
    text-align: center;
  }
}

@media (max-width: 420px) {
  .hero-title {
    font-size: 1.35rem;
  }

  .result-actions {
    flex-direction: column;
  }

  .result-actions .btn-action {
    width: 100%;
  }

  .file-name {
    max-width: 120px;
  }
}