*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg-color: #ffffff;
  --text-primary: #37352f;
  --text-secondary: #787774;
  --accent-color: #2eaadc;
  --border-color: #e9e9e7;
  --code-bg: #f7f6f3;
  --code-text: #eb5757;
  --quote-bg: #f9f9f8;
  --quote-border: #e9e9e7;
  --panel-bg: #f0f2f5;
  --input-bg: #fafafa;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    sans-serif;
  background: var(--panel-bg);
  color: var(--text-primary);
  line-height: 1.6;
}

.page-header {
  padding: 16px 20px;
  background: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
  margin: 0 0 6px;
  font-size: 1.25rem;
  font-weight: 600;
  color: #1a1a1a;
}

.page-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.workspace {
  display: flex;
  gap: 20px;
  padding: 16px 20px 20px;
  min-height: calc(100vh - 88px);
}

.panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 600;
  color: #1a1a1a;
}

#markdown-input {
  width: 100%;
  flex: 1;
  min-height: 420px;
  padding: 18px 20px;
  font-size: 14px;
  line-height: 1.6;
  font-family: "SFMono-Regular", ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
  border: 1px solid #d9d9d9;
  border-radius: 8px;
  resize: vertical;
  background: var(--input-bg);
  color: var(--text-primary);
}

#markdown-input:focus {
  outline: 2px solid rgba(46, 170, 220, 0.35);
  border-color: var(--accent-color);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

button {
  padding: 10px 18px;
  font-size: 14px;
  cursor: pointer;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.2s, transform 0.15s;
}

#pdf-btn {
  background: #dc3545;
  color: #fff;
}

#pdf-btn:hover:not(:disabled) {
  background: #c82333;
  transform: translateY(-1px);
}

#pdf-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
}

#download-btn {
  background: #1a1a1a;
  color: #fff;
}

#download-btn:hover:not(:disabled) {
  background: #333;
  transform: translateY(-1px);
}

#download-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
}

#render-btn {
  background: #eaeef2;
  color: var(--text-primary);
}

#render-btn:hover {
  background: #d0d7de;
}

.hint {
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-secondary);
}

#preview-wrap {
  flex: 1;
  overflow: auto;
  border-radius: 12px;
  background: transparent;
  box-shadow: none;
  border: none;
}

#preview {
  min-height: 420px;
  padding: 40px 44px;
  background-color: var(--bg-color);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  line-height: 1.75;
  font-size: 16px;
  color: var(--text-primary);
}

/* ========== Markdown 元素深度美化 ========== */

#preview h1,
#preview h2,
#preview h3,
#preview h4 {
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  color: #1a1a1a;
  line-height: 1.3;
}

#preview h1:first-child {
  margin-top: 0;
}

#preview h1 {
  font-size: 2em;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.3em;
}

#preview h2 {
  font-size: 1.5em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.2em;
}

#preview h3 {
  font-size: 1.25em;
}

#preview h4 {
  font-size: 1.1em;
}

#preview p {
  margin: 0 0 1.2em;
  text-align: justify;
}

#preview ul,
#preview ol {
  margin: 0 0 1.2em;
  padding-left: 1.5em;
}

#preview li {
  margin-bottom: 0.4em;
}

#preview li::marker {
  color: var(--accent-color);
}

#preview strong {
  font-weight: 600;
  color: #1a1a1a;
}

#preview a {
  color: var(--accent-color);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 170, 220, 0.35);
}

#preview hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2em 0;
}

#preview blockquote {
  margin: 1.5em 0;
  padding: 16px 20px;
  background-color: var(--quote-bg);
  border-left: 4px solid var(--accent-color);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
  font-style: italic;
}

#preview blockquote p:last-child {
  margin-bottom: 0;
}

/* 行内代码 */
#preview :not(pre) > code {
  font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

/* 代码块 + Highlight.js Atom One Dark */
#preview pre {
  background-color: #282c34;
  border-radius: 8px;
  padding: 20px;
  overflow-x: auto;
  margin: 1.5em 0;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

#preview pre code {
  background-color: transparent;
  color: #abb2bf;
  padding: 0;
  font-size: 14px;
  line-height: 1.6;
  font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
}

#preview pre code.hljs {
  display: block;
  overflow-x: auto;
}

/* 表格圆角容器 */
#preview .table-wrapper {
  overflow: hidden;
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin: 1.5em 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

#preview table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95em;
  margin: 0;
}

#preview th,
#preview td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

#preview th {
  background-color: #f7f6f3;
  font-weight: 600;
  color: #1a1a1a;
  white-space: nowrap;
}

#preview tr:last-child td {
  border-bottom: none;
}

#preview tr:nth-child(even) {
  background-color: #fcfcfc;
}

#preview tr:hover {
  background-color: #f0f7ff;
}

/* KaTeX 公式 */
#preview .katex {
  font-size: 1.1em;
}

#preview .katex-display {
  margin: 1.5em 0;
  padding: 16px;
  background-color: #f8f9fa;
  border-radius: 8px;
  border: 1px dashed var(--border-color);
  overflow-x: auto;
  overflow-y: hidden;
}

#preview img {
  max-width: 100%;
  border-radius: 8px;
  margin: 1em 0;
}

/* Mermaid 卡片容器 */
#preview .mermaid-wrapper {
  width: 100%;
  max-width: 100%;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 24px;
  margin: 1.5em 0;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: auto;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  box-sizing: border-box;
}

#preview .mermaid-wrapper .mermaid,
#preview .mermaid {
  text-align: center;
  margin: 0;
  width: 100%;
}

#preview .mermaid svg {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif !important;
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

#preview .mermaid .edgePath .path {
  stroke-width: 2px;
}

#preview .mermaid .edgeLabel,
#preview .mermaid .nodeLabel,
#preview .mermaid .label {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif !important;
}

.hint--pdf {
  margin-top: 6px;
}

@media (max-width: 900px) {
  .workspace {
    flex-direction: column;
  }

  #markdown-input,
  #preview {
    min-height: 280px;
  }

  #preview {
    padding: 24px 20px;
  }
}

/* ========== 矢量 PDF 打印样式 ========== */
@media print {
  @page {
    size: A4;
    margin: 15mm 20mm;
  }

  body {
    background: #fff !important;
  }

  .page-header,
  .panel--editor,
  .panel--preview > h2,
  .toolbar,
  .hint,
  .hint--pdf {
    display: none !important;
  }

  .workspace {
    display: block !important;
    padding: 0 !important;
    min-height: auto !important;
  }

  .panel--preview {
    display: block !important;
  }

  #preview-wrap {
    overflow: visible !important;
  }

  #preview {
    box-shadow: none !important;
    border-radius: 0 !important;
    padding: 0 !important;
    width: 100% !important;
    min-width: 0 !important;
    max-width: none !important;
    min-height: auto !important;
  }

  #preview pre,
  #preview .table-wrapper,
  #preview table,
  #preview .mermaid-wrapper,
  #preview blockquote,
  #preview .katex-display,
  #preview img {
    break-inside: avoid !important;
    page-break-inside: avoid !important;
  }

  #preview h1,
  #preview h2,
  #preview h3 {
    break-after: avoid !important;
    page-break-after: avoid !important;
  }

  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
}