/* ============================================================
   rich.css - 富文本内容渲染 + 富文本编辑器外壳
   ============================================================
   前台 index.html 与后台 admin/index.html 同时引入：
     · .research-body  —— 前台 Research 页面渲染后台写入的 HTML
     · .rte-*          —— 后台编辑器的工具栏 / 编辑区 / 图片弹窗
   编辑区也挂了 .research-body，所以后台所见即前台所得。

   ⚠️ 下面的排版/布局 class 是白名单，必须与这两处同步：
       functions/_lib/html.js  ALLOWED_CLASSES
       public/assets/js/editor.js  CLASSES
   ============================================================ */

/* ---- 1. 富文本内容基础排版 ---- */
.research-body {
  font-size: 16px;
  line-height: 1.78;
  color: var(--color-text);
  word-break: break-word;
}
.research-body > :first-child { margin-top: 0; }
.research-body > :last-child { margin-bottom: 0; }

.research-body p { margin: 0 0 14px; }
.research-body h2 {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.28;
  margin: 30px 0 12px;
}
.research-body h3 {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.35;
  margin: 26px 0 10px;
}
.research-body h4 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .02em;
  margin: 22px 0 8px;
}
.research-body blockquote {
  margin: 18px 0;
  padding: 14px 22px;
  border-left: 3px solid var(--color-accent);
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.7;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.research-body blockquote p { margin-bottom: 0; }
.research-body ul,
.research-body ol { margin: 0 0 14px; padding-left: 24px; }
.research-body ul { list-style: disc; }
.research-body ol { list-style: decimal; }
.research-body li { margin-bottom: 6px; }
.research-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.research-body a:hover { color: var(--color-accent-hover); }
.research-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 28px 0;
}
.research-body img {
  max-width: 100%;
  height: auto;
  margin: 18px 0;
  border-radius: var(--radius-md);
}
.research-body figure { margin: 18px 0; }
.research-body figure > img { margin: 0; }
.research-body figcaption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-tertiary);
}
.research-body pre {
  background: var(--color-bg-alt);
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
  margin: 0 0 14px;
}
.research-body code {
  background: var(--color-bg-alt);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: .92em;
}
.research-body pre code { background: none; padding: 0; }
.research-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 18px 0;
  font-size: 14px;
}
.research-body th,
.research-body td {
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
.research-body th {
  background: var(--color-bg-alt);
  font-weight: 600;
}
.research-body div { margin-bottom: 14px; }
.research-body > div:last-child { margin-bottom: 0; }

/* ---- 2. 文字样式 / 对齐 / 字体 ---- */
.research-body .text-center { display: block; text-align: center; }
.research-body .text-right { display: block; text-align: right; }

.research-body .text-small { font-size: 13px; line-height: 1.7; }
.research-body .text-lg { font-size: 22px; line-height: 1.6; }
.research-body .text-xl {
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.45;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.research-body .text-muted { color: var(--color-text-tertiary); }
.research-body .text-accent { color: var(--color-accent); }

.research-body .font-serif { font-family: var(--font-serif); }
.research-body .font-caps {
  letter-spacing: .16em;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 600;
}

/* ---- 3. 图片尺寸 ---- */
.research-body img.img-full { width: 100%; }
.research-body img.img-half { width: 50%; }
.research-body img.img-center {
  display: block;
  width: 62%;
  margin-left: auto;
  margin-right: auto;
}
.research-body img.img-square {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.research-body img.img-plain { border-radius: 0; }

/* ---- 4. 结构布局块 ---- */
.research-body .columns-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 20px 0;
}
.research-body .columns-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 20px 0;
}
.research-body .columns-2 > .column,
.research-body .columns-3 > .column { min-width: 0; }
.research-body .columns-2 p,
.research-body .columns-3 p { margin-bottom: 6px; }
.research-body .columns-2 img,
.research-body .columns-3 img { margin: 0 0 8px; width: 100%; }

.research-body .box-accent {
  padding: 20px 24px;
  background: var(--color-accent);
  color: #fffdf8;
  border-radius: var(--radius-md);
  margin: 20px 0;
}
.research-body .box-accent p,
.research-body .box-accent .text-muted { color: #fffdf8; }
.research-body .box-accent p:last-child { margin-bottom: 0; }

.research-body .box-note {
  padding: 16px 20px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin: 20px 0;
  color: var(--color-text-secondary);
}
.research-body .box-note p:last-child { margin-bottom: 0; }

.research-body .box-quote {
  padding: 8px 0 8px 22px;
  border-left: 3px solid var(--color-accent);
  margin: 20px 0;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.7;
}
.research-body .box-quote p:last-child { margin-bottom: 0; }

.research-body .mt-lg { margin-top: 32px; }
.research-body .mb-lg { margin-bottom: 32px; }
.research-body .no-margin { margin: 0; }

/* ---- 5. 富文本编辑器外壳（仅后台使用） ---- */
.rte-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  background: var(--color-bg-alt);
}
.rte-toolbar-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  padding-right: 7px;
  border-right: 1px solid var(--color-border);
}
.rte-toolbar-group:last-child { border-right: none; padding-right: 0; }
.rte-toolbar-label {
  padding: 0 7px 0 5px;
  font-size: 11px;
  line-height: 30px;
  color: var(--color-text-tertiary);
  letter-spacing: .04em;
  white-space: nowrap;
}
.rte-icon-txt { font-size: 12px; }
.rte-btn {
  min-width: 30px;
  height: 30px;
  padding: 0 9px;
  border: none;
  background: none;
  border-radius: 6px;
  font-family: inherit;
  font-size: 13px;
  line-height: 1;
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background .15s var(--ease, ease), color .15s var(--ease, ease);
}
.rte-btn:hover { background: #fff; color: var(--color-text); box-shadow: var(--shadow-sm, 0 1px 4px rgba(0,0,0,.08)); }
.rte-btn:active { transform: translateY(1px); }
.rte-btn.is-active { background: var(--color-text); color: var(--color-bg); }
.rte-btn strong { font-weight: 700; }
.rte-btn em { font-style: italic; }
.rte-btn span.u { text-decoration: underline; }
.rte-btn span.s { text-decoration: line-through; }

.rte-editor {
  border: 1px solid var(--color-border);
  border-radius: 0 0 8px 8px;
  background: #fff;
  padding: 18px 20px;
  min-height: 240px;
  max-height: 620px;
  overflow-y: auto;
  outline: none;
}
.rte-editor:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(154, 85, 56, .12);
}
/* 点选中的图片：高亮提示「图片尺寸」按钮可以作用在它上面 */
.rte-editor img { cursor: pointer; }
.rte-editor img.rte-img-selected {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}
.rte-editor:empty::before {
  content: attr(data-placeholder);
  color: var(--color-text-tertiary);
  pointer-events: none;
}
.rte-editor.is-empty::before {
  content: attr(data-placeholder);
  color: var(--color-text-tertiary);
  pointer-events: none;
}

/* ---- 6. 编辑器弹窗（图片 URL / 链接） ---- */
.rte-dialog-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(15, 13, 10, .5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.rte-dialog {
  width: 100%;
  max-width: 480px;
  background: #fff;
  border-radius: 14px;
  box-shadow: var(--shadow-lg, 0 20px 60px rgba(0,0,0,.28));
  padding: 20px;
}
.rte-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}
.rte-dialog-header h4 { font-size: 16px; font-weight: 600; }
.rte-dialog-close {
  width: 30px;
  height: 30px;
  border: none;
  background: none;
  border-radius: 50%;
  font-size: 18px;
  line-height: 1;
  color: var(--color-text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.rte-dialog-close:hover { background: var(--color-bg-alt); color: var(--color-text); }
.rte-dialog-help {
  margin: 0 0 12px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--color-text-secondary);
}
.rte-dialog-help code {
  background: var(--color-bg-alt);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 11px;
}
.rte-dialog-input {
  width: 100%;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  color: var(--color-text);
}
.rte-dialog-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(154, 85, 56, .12);
}
.rte-dialog-error {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-danger, #c0392b);
}
.rte-dialog-preview {
  margin-top: 12px;
  padding: 8px;
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
}
.rte-dialog-preview img { max-width: 100%; max-height: 180px; border-radius: 6px; }
.rte-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 18px;
}

/* ---- 7. 响应式 ---- */
@media (max-width: 720px) {
  .research-body .columns-2,
  .research-body .columns-3 { grid-template-columns: 1fr; }
  .research-body .text-xl { font-size: 24px; }
  .rte-editor { padding: 14px 14px; min-height: 180px; }
  .rte-toolbar { padding: 6px; }
}