/* ========================================================
   HPPT Prompt Generator - CSS Stylesheet (v3.4)
   支持：深色模式 (Dark) / 浅色模式 (Light) 动态切换
   响应式栅格布局、文件/文件夹卡片、必含重点页面、全局补充区
   页数灵活模式（固定/区间/不限）、水印反差等级、Markdown 渲染/原始代码视图切换
   ======================================================== */

:root {
  /* Default Dark Mode Theme */
  --bg: #0b0f19;
  --surface: #111827;
  --surface-hover: #1f2937;
  --surface-border: #374151;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  
  --input-bg: #0d131f;
  --input-border: #2d3748;
  --input-focus: #3b82f6;

  --code-bg: #080c14;
  --code-header-bg: #1e293b;
  --code-text: #e2e8f0;

  --card-subtle-bg: #0d1424;
  --card-subtle-border: #1e2c48;
  --card-inner-bg: #090e1a;
  --card-inner-border: #1a2538;

  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-subtle: rgba(59, 130, 246, 0.15);
  
  --accent: #8b5cf6;
  --accent-hover: #7c3aed;
  --accent-subtle: rgba(139, 92, 246, 0.15);
  
  --emerald: #10b981;
  --emerald-subtle: rgba(16, 185, 129, 0.15);
  
  --amber: #f59e0b;
  --amber-subtle: rgba(245, 158, 11, 0.15);
  
  --danger: #ef4444;
  --danger-subtle: rgba(239, 68, 68, 0.15);

  --radius: 10px;
  --radius-sm: 6px;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.15);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  --surface-border: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;

  --input-bg: #ffffff;
  --input-border: #cbd5e1;
  --input-focus: #2563eb;

  --code-bg: #ffffff;
  --code-header-bg: #f8fafc;
  --code-text: #0f172a;

  --card-subtle-bg: #f8fafc;
  --card-subtle-border: #e2e8f0;
  --card-inner-bg: #f1f5f9;
  --card-inner-border: #e2e8f0;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-subtle: rgba(37, 99, 235, 0.1);

  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-subtle: rgba(124, 58, 237, 0.1);

  --emerald: #059669;
  --emerald-subtle: rgba(5, 150, 105, 0.1);

  --amber: #d97706;
  --amber-subtle: rgba(217, 119, 6, 0.1);

  --danger: #dc2626;
  --danger-subtle: rgba(220, 38, 38, 0.1);

  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.06);
}

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

body {
  background-color: var(--bg);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  padding: 24px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
  max-width: 1620px;
  margin: 0 auto;
}

/* Header */
header {
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--surface-border);
}

.title-group h1 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.title-group p {
  font-size: 13.5px;
  color: var(--text-muted);
  margin-top: 4px;
}

.badge-tag {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 600;
}

.badge-cf {
  background: rgba(245, 158, 11, 0.2);
  color: var(--amber);
  border: 1px solid rgba(245, 158, 11, 0.4);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
}

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

/* Theme Toggle Button */
.btn-theme-toggle {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-main);
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-theme-toggle:hover {
  background: var(--surface-hover);
  border-color: var(--primary);
}

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease-in-out;
  text-decoration: none;
  user-select: none;
}

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

.btn-accent {
  background: var(--accent);
  color: #fff;
}
.btn-accent:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--surface);
  border-color: var(--surface-border);
  color: var(--text-main);
}
.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: #4b5563;
}

.btn-outline-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}
.btn-outline-danger:hover {
  background: var(--danger-subtle);
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--surface-border);
  color: var(--text-dim);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  transition: all 0.15s;
}

.btn-icon:hover {
  background: var(--danger-subtle);
  border-color: var(--danger);
  color: var(--danger);
}

/* Prerequisites Accordion Box */
.prereq-card {
  background: var(--card-subtle-bg);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
  transition: all 0.2s ease;
}

.prereq-header {
  padding: 12px 18px;
  background: var(--surface-hover);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.prereq-header h2 {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.prereq-content {
  padding: 16px 18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  font-size: 13px;
  background: var(--card-subtle-bg);
  border-top: 1px solid var(--surface-border);
}

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

.prereq-plugin-box {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  padding: 12px 14px;
}

.prereq-plugin-title {
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.prereq-step-text {
  color: var(--text-muted);
  font-size: 12.5px;
  line-height: 1.55;
  margin-bottom: 8px;
}

.code-inline {
  background: var(--card-inner-bg);
  color: var(--primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  border: 1px solid var(--surface-border);
}

.prereq-code-snippet {
  background: var(--card-inner-bg);
  border: 1px solid var(--surface-border);
  border-radius: 6px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 6px;
}

.prereq-code-snippet code {
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: 11.5px;
  word-break: break-all;
}

.btn-mini-copy {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s;
}

.btn-mini-copy:hover {
  background: var(--primary);
  color: #fff;
}

/* Presets Bar */
.presets-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  background: var(--surface);
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow);
}

.presets-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.preset-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-preset {
  background: var(--card-subtle-bg);
  color: var(--text-muted);
  border: 1px solid var(--surface-border);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-preset:hover {
  background: var(--surface-hover);
  color: var(--text-main);
  border-color: var(--primary);
}

.btn-preset.active {
  background: var(--primary-subtle);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

/* Main Grid Layout */
.workspace-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 20px;
  align-items: start;
}

/* Right column: sticky so preview stays in view on scroll */
.preview-column {
  position: sticky;
  top: 24px;
  align-self: start;
  height: calc(100vh - 48px);
}

@media (max-width: 1180px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
  /* On narrow screens, preview column is no longer sticky */
  .preview-column {
    position: static;
    height: auto;
  }
  .preview-panel {
    height: 70vh;
  }
}

/* Section Cards */
.form-section {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.section-header h2 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* Form Controls */
.form-group {
  margin-bottom: 14px;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.form-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 3px;
}

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 9px 12px;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
  font-family: inherit;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 2px var(--primary-subtle);
}

.input-with-button {
  display: flex;
  gap: 8px;
  align-items: center;
}

.input-with-button input {
  flex: 1;
}

/* ========================================================
   Section ①: Enhanced Slide Count Modes (固定/区间/不限)
   ======================================================== */
.slide-mode-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 10px;
}

.slide-mode-btn {
  background: var(--card-subtle-bg);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s;
}

.slide-mode-btn:hover {
  background: var(--surface-hover);
  color: var(--text-main);
}

.slide-mode-btn.active {
  background: var(--primary-subtle);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

.slide-mode-panel {
  background: var(--card-inner-bg);
  border: 1px solid var(--card-inner-border);
  border-radius: 8px;
  padding: 12px 14px;
}

.slide-range-inputs {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slide-range-inputs input {
  width: 90px;
  text-align: center;
}

/* ========================================================
   Section ②: Unified Template & Custom PPTX Box
   ======================================================== */
.template-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

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

.template-item {
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 10px;
  cursor: pointer;
  background: var(--card-subtle-bg);
  transition: all 0.15s;
}

.template-item:hover {
  border-color: var(--primary);
  background: var(--surface-hover);
}

.template-item.selected {
  border-color: var(--primary);
  background: var(--primary-subtle);
}

.template-item .template-name {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-main);
  margin-bottom: 2px;
}

.template-item .template-desc {
  font-size: 11.5px;
  color: var(--text-muted);
}

.custom-pptx-panel {
  margin-top: 14px;
  padding: 14px;
  background: var(--card-subtle-bg);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
}

.custom-pptx-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.custom-pptx-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}

.custom-pptx-toggle input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

/* ========================================================
   Section ③: Enhanced File & Folder Section
   ======================================================== */
.file-action-toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.drop-zone {
  border: 2px dashed var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 18px;
  text-align: center;
  background: var(--card-subtle-bg);
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 14px;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--primary);
  background: var(--primary-subtle);
}

.drop-zone-text {
  font-size: 13px;
  color: var(--text-main);
  font-weight: 500;
}

.drop-zone-sub {
  font-size: 11.5px;
  color: var(--text-dim);
  margin-top: 3px;
}

.files-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 14px;
}

/* File / Folder Card */
.file-item-card {
  background: var(--card-subtle-bg);
  border: 1px solid var(--card-subtle-border);
  border-radius: 8px;
  padding: 12px 14px;
  transition: all 0.15s ease;
}

.file-item-card:hover {
  border-color: var(--primary);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.file-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.file-title-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.file-name-text {
  font-weight: 600;
  font-size: 13.5px;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size-text {
  font-size: 11.5px;
  color: var(--text-dim);
  flex-shrink: 0;
}

/* Badges */
.file-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.badge-pdf    { background: rgba(239, 68, 68, 0.2); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.4); }
.badge-doc    { background: rgba(59, 130, 246, 0.2); color: #3b82f6; border: 1px solid rgba(59, 130, 246, 0.4); }
.badge-xls    { background: rgba(16, 185, 129, 0.2); color: #10b981; border: 1px solid rgba(16, 185, 129, 0.4); }
.badge-ppt    { background: rgba(245, 158, 11, 0.2); color: #f59e0b; border: 1px solid rgba(245, 158, 11, 0.4); }
.badge-img    { background: rgba(168, 85, 247, 0.2); color: #8b5cf6; border: 1px solid rgba(168, 85, 247, 0.4); }
.badge-folder { background: rgba(234, 88, 12, 0.25); color: #f97316; border: 1px solid rgba(234, 88, 12, 0.45); }
.badge-md     { background: rgba(14, 165, 233, 0.2); color: #0ea5e9; border: 1px solid rgba(14, 165, 233, 0.4); }
.badge-other  { background: rgba(100, 116, 139, 0.2); color: #64748b; border: 1px solid rgba(100, 116, 139, 0.4); }

.file-path-row {
  margin-bottom: 8px;
}

.file-path-input {
  font-family: var(--font-mono);
  font-size: 12px !important;
  padding: 6px 10px !important;
  background: var(--input-bg) !important;
  border-color: var(--input-border) !important;
  color: var(--primary) !important;
}

/* File Role & Usage Input Box */
.file-role-box {
  background: var(--card-inner-bg);
  border: 1px solid var(--card-inner-border);
  border-radius: 6px;
  padding: 10px 12px;
}

.file-role-label {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.file-role-textarea {
  width: 100%;
  font-size: 12.5px !important;
  padding: 6px 10px !important;
  background: var(--input-bg) !important;
  border: 1px solid var(--input-border) !important;
  border-radius: 4px;
  resize: vertical;
  min-height: 48px;
  color: var(--text-main);
  line-height: 1.4;
}

.file-role-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.role-chip {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.role-chip:hover {
  background: var(--primary-subtle);
  border-color: var(--primary);
  color: var(--primary);
}

/* ========================================================
   Section ④: Enhanced Directory Section
   ======================================================== */
.dir-boundary-box {
  background: var(--card-subtle-bg);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 16px;
}

.dir-field-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 5px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.dir-field-sub {
  font-size: 11.5px;
  color: var(--text-dim);
  font-weight: 400;
}

.dir-input-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
}

.dir-input-row:last-child {
  margin-bottom: 0;
}

.dir-input {
  font-family: var(--font-mono);
  font-size: 12px !important;
  background: var(--input-bg) !important;
  color: var(--text-main);
}

.btn-folder-pick {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s;
}

.btn-folder-pick:hover {
  background: var(--primary-subtle);
  border-color: var(--primary);
  color: var(--primary);
}

.dir-presets-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--surface-border);
}

.dir-preset-chip {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.dir-preset-chip:hover {
  background: var(--surface-hover);
  border-color: var(--primary);
  color: var(--primary);
}

.dir-preset-chip.active {
  background: var(--primary-subtle);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

/* ========================================================
   Section ⑤: Mandatory Pages & Topics
   ======================================================== */
.mandatory-pages-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
}

.mandatory-page-card {
  background: var(--card-subtle-bg);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all 0.15s;
}

.mandatory-page-card:hover {
  border-color: var(--accent);
}

.mandatory-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.page-index-tag {
  background: var(--accent-subtle);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
}

.mandatory-page-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 8px;
}

@media (max-width: 680px) {
  .mandatory-page-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================================
   Section ⑥: Facts & Points Manager
   ======================================================== */
.points-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 8px;
}

.point-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-add-point {
  background: var(--card-subtle-bg);
  border: 1px dashed var(--surface-border);
  color: var(--text-muted);
  padding: 7px 12px;
  border-radius: 6px;
  font-size: 12.5px;
  cursor: pointer;
  width: 100%;
  text-align: center;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-add-point:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-subtle);
}

/* ========================================================
   Section ⑦: Global Considerations & Custom Notes
   ======================================================== */
.global-notes-textarea {
  min-height: 80px;
  resize: vertical;
  line-height: 1.5;
  font-size: 12.5px !important;
}

/* ========================================================
   Section ⑧: Watermark with Contrast Levels
   ======================================================== */
.watermark-box {
  background: var(--card-subtle-bg);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  padding: 13px 15px;
  margin-bottom: 16px;
  transition: all 0.2s ease;
}

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

.watermark-checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}

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

.watermark-sub-panel {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--surface-border);
}

.watermark-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.contrast-row {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contrast-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.contrast-chip {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  font-size: 11.5px;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.contrast-chip:hover {
  background: var(--surface-hover);
  color: var(--text-main);
}

.contrast-chip.active {
  background: var(--primary-subtle);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

/* ========================================================
   Right Column: Output Preview Panel
   ======================================================== */
.preview-panel {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.preview-header {
  padding: 10px 14px;
  background: var(--code-header-bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--surface-border);
  flex-shrink: 0;
  flex-wrap: wrap;
  gap: 8px;
  transition: background-color 0.2s, border-color 0.2s;
}

.preview-tabs {
  display: flex;
  gap: 6px;
}

.preview-tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.preview-tab-btn.active {
  background: var(--surface);
  color: var(--primary);
  border-color: var(--surface-border);
  box-shadow: var(--shadow);
}

[data-theme="dark"] .preview-tab-btn.active {
  background: #0f172a;
  color: #fff;
  border-color: #334155;
}

.preview-actions {
  display: flex;
  gap: 6px;
  align-items: center;
}

/* Toggle View Mode Button */
.btn-view-toggle {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-main);
  padding: 5px 11px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s;
}

.btn-view-toggle:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.preview-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  background: var(--code-bg);
  transition: background-color 0.2s;
}

.code-output {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--code-text);
  white-space: pre-wrap;
  word-break: break-all;
  transition: color 0.2s;
}

/* Markdown Rendered View (自适应深浅模式) */
.markdown-rendered-view {
  color: var(--code-text);
  font-size: 13.5px;
  line-height: 1.65;
  transition: color 0.2s;
}

.markdown-rendered-view h1 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--surface-border);
}

.markdown-rendered-view h2 {
  font-size: 17px;
  color: var(--primary);
  margin-top: 18px;
  margin-bottom: 10px;
}

.markdown-rendered-view h3 {
  font-size: 15px;
  color: var(--accent);
  margin-top: 16px;
  margin-bottom: 8px;
}

.markdown-rendered-view h4 {
  font-size: 14px;
  color: var(--amber);
  margin-top: 14px;
  margin-bottom: 6px;
}

.markdown-rendered-view hr {
  border: none;
  border-top: 1px solid var(--surface-border);
  margin: 16px 0;
}

.markdown-rendered-view p {
  margin-bottom: 10px;
  color: var(--code-text);
}

.markdown-rendered-view ul,
.markdown-rendered-view ol {
  margin-left: 20px;
  margin-bottom: 12px;
  color: var(--code-text);
}

.markdown-rendered-view li {
  margin-bottom: 4px;
}

.markdown-rendered-view strong {
  color: var(--text-main);
  font-weight: 700;
}

.markdown-rendered-view code {
  background: var(--card-inner-bg);
  color: var(--primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  border: 1px solid var(--surface-border);
}

.markdown-rendered-view pre {
  background: var(--card-subtle-bg);
  border: 1px solid var(--surface-border);
  border-radius: 6px;
  padding: 12px;
  overflow-x: auto;
  margin-bottom: 12px;
}

.markdown-rendered-view pre code {
  background: transparent;
  color: var(--emerald);
  border: none;
  padding: 0;
}

.markdown-rendered-view blockquote {
  border-left: 3px solid var(--primary);
  background: var(--card-subtle-bg);
  padding: 8px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 12px;
  color: var(--text-muted);
}

/* Toast Message */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--surface);
  border: 1px solid var(--primary);
  color: var(--text-main);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 8px;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 9999;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}