:root {}

  .clean-header {
    text-align: center;
    padding: 36px 20px 24px;
    max-width: 900px;
    margin: 0 auto;
  }

  .clean-header .badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(0, 210, 255, 0.08);
    border: 1px solid rgba(0, 210, 255, 0.25);
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 16px;
    text-transform: uppercase;
  }

  .clean-header h1 {
    font-size: 2.3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-main);
    margin-bottom: 12px;
  }

  .clean-header p {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 720px;
    margin: 0 auto;
  }

  .studio-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px 60px;
  }

  /* Control Bar */
  .control-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px 12px 0 0;
    padding: 12px 16px;
  }

  .toolbar-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
  }

  .tool-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 7px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
  }

  .tool-btn:hover {
    background: var(--bg-surface);
    color: var(--text-main);
    border-color: var(--accent);
  }

  .tool-btn.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #08090d;
    font-weight: 700;
  }

  .tool-btn.primary:hover {
    background: #33dcff;
    border-color: #33dcff;
    box-shadow: 0 0 16px rgba(0, 210, 255, 0.35);
  }

  .tool-select {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 7px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    outline: none;
    cursor: pointer;
  }

  .tool-select:focus {
    border-color: var(--accent);
  }

  /* Split Workspace */
  .workspace-pane {
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: 720px;
    background: var(--bg-surface);
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
  }

  .editor-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
    border-right: 1px solid var(--border-color);
    background: var(--bg-base);
  }

  .pane-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--text-subtle);
    text-transform: uppercase;
  }

  .markdown-editor {
    flex: 1;
    width: 100%;
    background: transparent;
    border: none;
    padding: 20px;
    color: var(--text-main);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 14px;
    line-height: 1.7;
    resize: none;
    outline: none;
    tab-size: 2;
  }

  .preview-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bg-base);
    overflow: hidden;
  }

  .preview-content {
    flex: 1;
    padding: 32px 40px;
    overflow-y: auto;
    color: var(--text-muted);
    line-height: 1.75;
    font-size: 15px;
  }

  /* Academic Document Styles within Preview */
  .preview-content.theme-academic {
    font-family: "Georgia", "Cambria", "Times New Roman", serif;
    color: var(--text-main);
  }
  .preview-content.theme-modern {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  }
  .preview-content.theme-mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13.5px;
  }

  .preview-content h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-main);
    margin: 0 0 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
  }

  .preview-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 28px 0 12px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-color);
  }

  .preview-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: #93c5fd;
    margin: 20px 0 10px;
  }

  .preview-content p {
    margin-bottom: 16px;
  }

  .preview-content blockquote {
    margin: 16px 0;
    padding: 12px 20px;
    background: rgba(0, 210, 255, 0.05);
    border-left: 4px solid var(--accent);
    color: var(--text-muted);
    font-style: italic;
  }

  .preview-content code {
    background: var(--bg-surface);
    color: #38bdf8;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: ui-monospace, monospace;
    font-size: 0.9em;
  }

  .preview-content pre {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 18px 0;
  }

  .preview-content pre code {
    background: transparent;
    padding: 0;
    color: var(--text-main);
  }

  .preview-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
  }

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

  .preview-content th {
    background: var(--bg-card);
    color: var(--text-main);
    font-weight: 700;
  }

  .preview-content tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
  }

  .preview-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 28px 0;
  }

  .preview-content ul, .preview-content ol {
    padding-left: 24px;
    margin-bottom: 16px;
  }

  .preview-content li {
    margin-bottom: 6px;
  }

  /* KaTeX formula enhancements */
  .katex-display {
    padding: 12px 0;
    overflow-x: auto;
    overflow-y: hidden;
  }

  /* Status Bar */
  .studio-status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 12px 12px;
    padding: 10px 18px;
    font-size: 12px;
    color: var(--text-muted);
  }

  .stats-cluster {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
  }

  .stat-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }

  .stat-badge strong {
    color: var(--text-main);
  }

  /* FAQ Section */
  .faq-container {
    max-width: 900px;
    margin: 60px auto 20px;
    padding: 0 20px;
  }

  .faq-heading {
    text-align: center;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 24px;
  }

  .faq-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 16px;
  }

  .faq-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 8px;
  }

  .faq-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
  }

  /* Print Stylesheet for Academic Papers */
  @media print {
    @page {
      margin: 0; /* Kills browser URL, Date, and Page Number watermarks */
      size: auto;
    }
    body { background: #fff !important; }

    /* Hide the entire app UI during print */
    body > *:not(#pdfPrintTable) {
      display: none !important;
    }

    .preview-content {
      position: relative !important;
      width: 100% !important;
      padding: 0 2.54cm !important; /* 1-inch side margins */
      background: #ffffff !important;
      color: #111827 !important;
      font-size: 12pt !important;
      line-height: 1.6 !important;
      overflow: visible !important;
      height: auto !important;
    }
    .preview-content h1, .preview-content h2, .preview-content h3 {
      color: #000000 !important;
      border-bottom-color: var(--text-main) !important;
    }
    .preview-content code, .preview-content pre {
      background: #f3f4f6 !important;
      color: #111827 !important;
      border-color: var(--text-main) !important;
    }
    .preview-content blockquote {
      background: #f9fafb !important;
      border-left-color: #3b82f6 !important;
      color: #374151 !important;
    }
    .preview-content table, .preview-content th, .preview-content td {
      border-color: var(--text-muted) !important;
      color: #111827 !important;
    }
    .preview-content th {
      background: #f3f4f6 !important;
    }}

  @media (max-width: 900px) {
    .workspace-pane {
      grid-template-columns: 1fr;
      height: 900px;
    }
    .editor-wrapper {
      height: 450px;
      border-right: none;
      border-bottom: 1px solid var(--border-color);
    }
    .preview-wrapper {
      height: 450px;
    }}