/* ============================================================
   二维码生成器 - 样式表
   ============================================================ */

:root {
  /* Dark theme (default) */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a26;
  --bg-elevated: #22222e;
  --bg-hover: #2a2a38;
  --border-color: #2e2e3e;
  --border-light: #3a3a4e;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b0;
  --text-tertiary: #707080;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-light: rgba(124, 58, 237, 0.15);
  --accent-glow: rgba(124, 58, 237, 0.3);
  --success: #10b981;
  --success-light: rgba(16, 185, 129, 0.15);
  --danger: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.15);
  --warning: #f59e0b;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px var(--accent-glow);
  --transition: 0.2s ease;
  --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
}

[data-theme="light"] {
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f0f1f5;
  --bg-elevated: #ffffff;
  --bg-hover: #f0f1f5;
  --border-color: #e2e4ea;
  --border-light: #d0d2da;
  --text-primary: #1a1a2e;
  --text-secondary: #5a5a70;
  --text-tertiary: #9090a0;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-light: rgba(124, 58, 237, 0.08);
  --accent-glow: rgba(124, 58, 237, 0.15);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* ============================================================
   Header
   ============================================================ */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] .app-header {
  background: rgba(255, 255, 255, 0.85);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), #a855f7);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: var(--shadow-glow);
}

.brand-icon svg {
  width: 22px;
  height: 22px;
}

.brand-text h1 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-text p {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ============================================================
   Buttons & Controls
   ============================================================ */
.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

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

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

.text-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-decoration: none;
}

.text-btn:hover {
  background: var(--accent-light);
}

.text-btn.danger {
  color: var(--danger);
}

.text-btn.danger:hover {
  background: var(--danger-light);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: none;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #9333ea);
  color: white;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--border-light);
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 9px;
  background: var(--accent);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
}

/* ============================================================
   Main Layout
   ============================================================ */
.app-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

.generator {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.generator-left {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.generator-right {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: sticky;
  top: 80px;
  align-self: start;
}

/* ============================================================
   Panels
   ============================================================ */
.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: border-color var(--transition);
}

.panel:hover {
  border-color: var(--border-light);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.panel-header h2 {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.panel-hint {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

/* ============================================================
   Type Tabs
   ============================================================ */
.type-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.type-tab {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 500;
  transition: all var(--transition);
}

.type-tab svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.type-tab:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-light);
}

.type-tab.active {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

/* ============================================================
   Input Forms
   ============================================================ */
.input-forms {
  position: relative;
}

.form-pane {
  display: none;
  flex-direction: column;
  gap: 0.85rem;
}

.form-pane.active {
  display: flex;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-row label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-row-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.form-row-2col > div {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-row-2col label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.input-field {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-family: inherit;
  transition: all var(--transition);
  outline: none;
}

.input-field:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.input-field::placeholder {
  color: var(--text-tertiary);
}

.textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}

.char-count {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-align: right;
}

.form-tip {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  padding: 0.5rem 0.75rem;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

.password-wrap {
  position: relative;
}

.password-wrap .input-field {
  padding-right: 2.5rem;
}

.password-wrap .icon-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  border: none;
  background: transparent;
}

.checkbox-row {
  display: flex;
  align-items: flex-end;
  padding-bottom: 0.2rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ============================================================
   Options Grid
   ============================================================ */
.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.option-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.option-item.full-width {
  grid-column: 1 / -1;
}

.option-item > label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.option-value {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.82rem;
}

/* Range slider */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-secondary);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-secondary);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow-sm);
  cursor: pointer;
}

/* Segmented control */
.seg-control {
  display: flex;
  gap: 2px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.seg-control button {
  flex: 1;
  padding: 0.4rem 0.25rem;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  line-height: 1.2;
}

.seg-control button span {
  font-size: 0.6rem;
  font-weight: 400;
  opacity: 0.6;
}

.seg-control button:hover {
  color: var(--text-primary);
}

.seg-control button.active {
  background: var(--accent);
  color: white;
  box-shadow: var(--shadow-sm);
}

.seg-control button.active span {
  opacity: 0.8;
}

/* Color picker */
.color-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 36px;
  height: 36px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 2px;
  background: var(--bg-tertiary);
}

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

input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 3px;
}

.color-text {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  width: 90px;
}

/* Logo upload */
.logo-upload {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.logo-dropzone {
  cursor: pointer;
  display: block;
}

.logo-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 1.25rem;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  transition: all var(--transition);
  text-align: center;
}

.logo-placeholder svg {
  width: 28px;
  height: 28px;
  opacity: 0.5;
}

.logo-placeholder span {
  font-size: 0.82rem;
}

.logo-hint {
  font-size: 0.72rem !important;
  opacity: 0.6;
}

.logo-dropzone:hover .logo-placeholder {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.logo-preview {
  display: none;
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto;
}

.logo-preview.active {
  display: block;
}

.logo-preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: white;
}

.logo-remove {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: none;
  background: var(--danger);
  color: white;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  box-shadow: var(--shadow-sm);
}

.logo-size-control label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ============================================================
   Preview Panel
   ============================================================ */
.preview-panel {
  text-align: center;
}

.preview-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  padding: 1rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 1rem;
  overflow: hidden;
}

.preview-container::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(45deg, var(--bg-hover) 25%, transparent 25%),
    linear-gradient(-45deg, var(--bg-hover) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--bg-hover) 75%),
    linear-gradient(-45deg, transparent 75%, var(--bg-hover) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  opacity: 0.15;
  pointer-events: none;
}

.preview-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-tertiary);
  z-index: 1;
}

.preview-empty svg {
  width: 64px;
  height: 64px;
  opacity: 0.3;
}

.preview-empty p {
  font-size: 0.85rem;
  line-height: 1.6;
  text-align: center;
}

#qr-canvas {
  position: relative;
  z-index: 1;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: none;
}

#qr-canvas.active {
  display: block;
}

.preview-empty.hidden {
  display: none;
}

/* Download section */
.download-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.download-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.download-row label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

.download-row .input-field {
  width: auto;
  min-width: 140px;
}

.download-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.download-buttons .btn {
  width: 100%;
}

.download-section .full-width {
  width: 100%;
  justify-content: center;
  padding: 0.5rem;
}

/* Encoded data */
.encoded-data {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.5;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  max-height: 120px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text-secondary);
}

/* ============================================================
   Tools Section
   ============================================================ */
.tools-section {
  margin-bottom: 2rem;
}

.tool-tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0;
}

.tool-tab {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1rem;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: -1px;
}

.tool-tab svg {
  width: 16px;
  height: 16px;
}

.tool-tab:hover {
  color: var(--text-primary);
}

.tool-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tool-pane {
  display: none;
}

.tool-pane.active {
  display: block;
}

/* Batch */
.batch-layout {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.batch-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.batch-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.batch-progress {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a855f7);
  border-radius: 3px;
  width: 0%;
  transition: width 0.3s ease;
}

#batch-progress-text {
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* Scanner */
.scanner-layout {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.scanner-container {
  width: 100%;
  max-width: 480px;
  position: relative;
}

.qr-reader {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.qr-reader video {
  border-radius: var(--radius-md);
  width: 100%;
}

.scanner-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 3rem;
  background: var(--bg-tertiary);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
}

.scanner-placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.3;
}

.scanner-placeholder.hidden {
  display: none;
}

.scanner-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  max-width: 480px;
}

.scanner-controls .btn {
  width: 100%;
}

.scan-result {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.scan-result label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 0.5rem;
}

.scan-result-content pre {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.scan-result-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* History */
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.history-hint {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.history-actions {
  display: flex;
  gap: 0.5rem;
}

.history-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
}

.history-empty {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  color: var(--text-tertiary);
  font-size: 0.88rem;
}

.history-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  position: relative;
  group: true;
}

.history-item:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.history-item canvas {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-sm);
}

.history-item-text {
  font-size: 0.72rem;
  color: var(--text-secondary);
  width: 100%;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-item-type {
  font-size: 0.65rem;
  color: var(--text-tertiary);
  background: var(--bg-primary);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.history-item-delete {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: none;
  background: var(--danger);
  color: white;
  font-size: 0.7rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.history-item:hover .history-item-delete {
  display: flex;
}

/* ============================================================
   Footer
   ============================================================ */
.app-footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-tertiary);
  font-size: 0.78rem;
}

/* ============================================================
   Toast
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.85rem;
  color: var(--text-primary);
  animation: toast-in 0.3s ease;
  max-width: 320px;
}

.toast.success {
  border-color: var(--success);
  background: var(--success-light);
}

.toast.error {
  border-color: var(--danger);
  background: var(--danger-light);
}

.toast svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.toast.success svg { color: var(--success); }
.toast.error svg { color: var(--danger); }

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .generator {
    grid-template-columns: 1fr;
  }

  .generator-right {
    position: static;
  }
}

@media (max-width: 640px) {
  .app-main {
    padding: 1rem;
  }

  .generator {
    gap: 1rem;
  }

  .type-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 0.25rem;
  }

  .type-tabs::-webkit-scrollbar {
    display: none;
  }

  .type-tab {
    flex-shrink: 0;
  }

  .form-row-2col {
    grid-template-columns: 1fr;
  }

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

  .download-buttons {
    grid-template-columns: 1fr;
  }

  .tool-tabs {
    overflow-x: auto;
    scrollbar-width: none;
  }

  .tool-tabs::-webkit-scrollbar {
    display: none;
  }

  .tool-tab {
    flex-shrink: 0;
    font-size: 0.82rem;
    padding: 0.5rem 0.75rem;
  }

  .history-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.panel {
  animation: fade-in 0.3s ease;
}

/* Selection */
::selection {
  background: var(--accent);
  color: white;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}