/* 01-alignment 页专用：目录样式、正文段落、卡片、复制按钮等 */

.book-shell {
  grid-template-columns: 340px 1fr;
}

.toc-scroll {
  padding: 12px 18px;
  overflow: visible;
  max-height: none;
}

.toc__title {
  font-weight: 700;
  color: var(--ink);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0 10px;
  margin: 0 0 10px;
  border-bottom: 1px solid var(--border);
}

.toc a {
  color: var(--ink);
  text-decoration: none !important;
}

.toc a:hover {
  color: var(--accent-hover);
}

.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc .lv1 {
  display: block;
  padding: 6px 0 4px;
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
}

.toc.book-nav > li + li {
  margin-top: 4px;
}

.toc .lv1 .n {
  color: var(--accent);
  font-weight: 900;
  min-width: 18px;
}

.toc .lv2 {
  margin: 4px 0 12px 12px;
  padding-left: 12px;
  border-left: 2px solid rgba(231, 229, 228, 0.95);
  display: grid;
  gap: 2px;
}

.toc .lv2 a {
  display: flex;
  gap: 8px;
  padding: 5px 0;
  color: var(--ink-light);
  font-size: 12px;
  border-radius: 0;
}

.toc .lv2 .n {
  color: var(--ink-muted);
  font-weight: 800;
  min-width: 26px;
}

.toc .lv2-group {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.toc .lv2-group > a {
  display: flex;
  gap: 8px;
  padding: 5px 0;
  color: var(--ink-light);
  font-size: 12px;
  border-radius: 0;
}

.toc .lv2-group .n {
  color: var(--ink-muted);
  font-weight: 800;
  min-width: 26px;
}

.toc .lv2-group .lv3 {
  margin: 0 0 4px 0;
  padding-left: 18px;
  display: grid;
  gap: 1px;
  border-left: 1px solid rgba(231, 229, 228, 0.7);
}

.toc .lv2-group .lv3 a {
  display: block;
  padding: 2px 0;
  color: var(--ink-muted);
  font-size: 11px;
  font-weight: 500;
}

.toc .lv2-group .lv3 a:hover {
  color: var(--accent-hover);
}

.toc a.is-active {
  color: var(--accent-hover);
  font-weight: 700;
}

.toc .lv2 a.is-active,
.toc .lv2-group > a.is-active {
  position: relative;
}

.toc .lv2 a.is-active::before,
.toc .lv2-group > a.is-active::before {
  content: '';
  position: absolute;
  left: -14px;
  top: 6px;
  width: 2px;
  height: calc(100% - 12px);
  background: var(--accent);
  border-radius: 1px;
}

/* 正文区：段落与标题留白 */
.article {
  padding: 0;
}

.article p {
  margin-bottom: 1.1em;
  line-height: 1.75;
}

.article p + ul,
.article p + .cols {
  margin-top: 1em;
}

.article ul + p,
.article ul + h3,
.article .cols + p {
  margin-top: 1.25em;
}

.article h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.35rem;
}

.article h2:first-of-type {
  margin-top: 0;
}

.article h3 {
  margin-top: 1.6rem;
  margin-bottom: 0.65rem;
}

.article h4 {
  margin: 1.2rem 0 0.5rem;
  font-size: 1em;
}

.article ul {
  margin: 1em 0 1.25em;
  padding-left: 1.4em;
}

.article ul > li {
  margin-bottom: 1.3em;
  line-height: 1.9;
}

.article ul > li:last-child {
  margin-bottom: 0;
}

.article ul ul {
  margin: 0.6em 0 0.4em;
  padding-left: 1.2em;
}

.article ul ul li {
  margin-bottom: 0.4em;
}

.article ul ul li:last-child {
  margin-bottom: 0;
}

/* 卡片网格 */
.cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 1.25em 0;
}

.card {
  border: 1px solid rgba(231, 229, 228, 0.9);
  background: rgba(255, 255, 255, 0.86);
  border-radius: 14px;
  padding: 14px 16px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.card .t {
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink);
}

.card .d {
  color: var(--ink-light);
  font-size: 13px;
  line-height: 1.65;
}

.card .d ul {
  margin: 0.5em 0 0;
  padding-left: 1.2em;
}

.card .d li {
  margin-bottom: 0.35em;
}

.card .d li:last-child {
  margin-bottom: 0;
}

.card .d pre {
  margin: 8px 0 0;
}

/* 代码块复制按钮 */
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  border: 1px solid #e5e5e5;
  background: #fff;
  color: var(--ink);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 12px;
  cursor: pointer;
  box-shadow: none;
}

.copy-btn:hover {
  background: #f7f7f7;
}

.copy-btn[data-state="ok"] {
  border-color: rgba(13, 148, 136, 0.35);
  color: var(--accent-hover);
}

.article pre {
  margin: 1.25em 0 1.5em;
}

.article p + pre {
  margin-top: 1em;
}

/* 正文中的图片区域 */
.article .figure-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1.25em 0 1.5em;
  align-items: flex-start;
}

.article .figure-row img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.article .figure-row figcaption {
  margin-top: 0.5em;
  font-size: 13px;
  color: var(--ink-muted);
}

/* 语法高亮与正文一致 */
.book-main pre code.hljs {
  padding: 0;
  background: transparent;
}

.book-main .hljs-keyword,
.book-main .hljs-selector-tag,
.book-main .hljs-addition {
  color: var(--accent-hover);
  font-weight: 600;
}

.book-main .hljs-string,
.book-main .hljs-attr {
  color: #0d6e66;
}

.book-main .hljs-comment {
  color: var(--ink-muted);
  font-style: italic;
}

@media (max-width: 980px) {
  .book-shell {
    grid-template-columns: 1fr;
  }
}

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