/* The notebook extends the existing blue, white and slate academic palette. */
.notebook-page .language-controls button { min-height: 40px; min-width: 40px; }
.notebook-page .menu-toggle { min-width: 44px; min-height: 44px; }
.notebook-intro { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 64px; padding-block: 66px 42px; }
.notebook-kicker { color: var(--accent); font-size: 14px; margin-bottom: 14px; }
.notebook-intro h1 { max-width: 760px; font: 500 clamp(30px, 3.6vw, 46px)/1.25 Georgia, "Noto Serif CJK SC", "Microsoft YaHei", serif; text-wrap: balance; }
.notebook-lead { margin-top: 20px; max-width: 660px; color: var(--muted); font-size: 17px; }
.notebook-margin { align-self: end; border-left: 2px solid var(--accent); padding-left: 22px; font-size: 14px; }
.notebook-margin p { color: var(--muted); margin-block: 10px; }
.notebook-margin a { display: inline-block; padding-block: 5px; }
.notebook-routes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-block: 1px solid var(--line); }
.notebook-routes a { padding: 23px 25px; color: var(--ink); transition: background .18s ease; }
.notebook-routes a + a { border-left: 1px solid var(--line); }
.notebook-routes a:hover { background: var(--accent-soft); text-decoration: none; }
.notebook-routes strong { display: block; font-size: 15px; line-height: 1.6; }
.notebook-routes a > span { display: block; color: var(--muted); font-size: 13px; margin-top: 7px; }
.notebook-library { padding-top: 40px; padding-bottom: 30px; scroll-margin-top: 95px; }
.library-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 24px; }
.library-heading h2 { font-size: 23px; }
.library-heading > span { font-size: 13px; color: var(--muted); }
.notebook-tools { margin-bottom: 8px; }
.notebook-search { display: flex; gap: 12px; align-items: center; max-width: 650px; }
.notebook-search label { font-size: 14px; font-weight: 600; flex-shrink: 0; }
.notebook-search input { min-width: 0; width: 100%; min-height: 44px; border: 1px solid #a9b9c9; border-radius: 4px; padding: 10px 12px; color: var(--ink); background: white; font: inherit; font-size: 14px; }
.notebook-search input::placeholder { color: #626f7c; opacity: 1; }
.notebook-search button, .notebook-empty button, .article-top button { padding: 9px 14px; min-height: 44px; flex-shrink: 0; background: white; border: 1px solid var(--line); border-radius: 4px; font-size: 14px; }
.notebook-filters { display: flex; flex-wrap: wrap; gap: 5px 14px; margin-top: 14px; }
.notebook-filters button { padding: 9px 4px; min-height: 44px; border: 0; border-bottom: 2px solid transparent; background: none; font-size: 14px; color: var(--muted); }
.notebook-filters button[aria-pressed="true"] { border-bottom-color: var(--accent); color: var(--accent); font-weight: 650; }
.notebook-filters button:hover { color: var(--accent-hover); }
[data-note-count] { color: var(--muted); font-size: 13px; padding-block: 12px; min-height: 46px; }
.journal-list { border-top: 1px solid var(--line); }
.journal-row { display: grid; grid-template-columns: 150px minmax(0, 1fr) 90px; gap: 24px; padding: 28px 6px; border-bottom: 1px solid var(--line); }
.journal-meta { display: flex; flex-direction: column; gap: 5px; color: var(--muted); font-size: 12px; }
.journal-meta > span:first-child { color: var(--accent); font-weight: 600; font-size: 14px; }
.journal-body h2 { font-size: 20px; line-height: 1.5; margin-bottom: 8px; text-wrap: pretty; }
.journal-body h2 a { color: var(--ink); }
.journal-body h2 a:hover { color: var(--accent); }
.journal-body p { color: var(--muted); font-size: 14px; max-width: 700px; }
.journal-tags { display: flex; flex-wrap: wrap; gap: 6px 15px; margin-top: 13px; font-size: 12px; color: var(--muted); }
.journal-read { display: flex; flex-direction: column; gap: 10px; text-align: right; font-size: 12px; color: var(--muted); }
.journal-read > span:last-child { font-size: 23px; color: var(--accent); }
.notebook-empty { padding: 35px; background: var(--surface); text-align: center; }
.notebook-empty button { margin-top: 12px; }
.notebook-context { padding-block: 24px 55px; }
.notebook-context h2 { font-size: 18px; margin-bottom: 10px; }
.notebook-context p { max-width: 850px; color: var(--muted); font-size: 14px; margin-bottom: 12px; }
.article-top { display: flex; justify-content: space-between; align-items: center; padding-top: 27px; font-size: 14px; }
.article-top a { padding-block: 10px; }
.article-heading { padding-block: 30px 35px; border-bottom: 1px solid var(--line); }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 25px; color: var(--muted); font-size: 13px; margin-bottom: 15px; }
.article-meta > span:first-child { color: var(--accent); }
.article-heading h1 { max-width: 920px; font-size: clamp(28px, 3vw, 39px); line-height: 1.4; text-wrap: balance; }
.article-deck { max-width: 830px; color: var(--muted); margin-top: 16px; font-size: 17px; }
.article-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 65px; padding-block: 40px 60px; align-items: start; }
.article-sidebar { position: sticky; top: 100px; }
.article-directory > summary { display: none; }
.article-toc h2 { font-size: 14px; margin-bottom: 12px; }
.article-toc a { display: block; padding: 10px 0 10px 14px; border-left: 2px solid var(--line); color: var(--muted); font-size: 13px; line-height: 1.6; }
.article-toc a[aria-current="location"] { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.article-prose { min-width: 0; max-width: 770px; font-size: 16px; line-height: 1.95; overflow-wrap: break-word; }
.article-basis { border-left: 3px solid var(--accent); padding: 15px 20px; background: var(--surface); font-size: 14px; }
.article-basis p { margin-top: 6px; color: var(--muted); }
.article-section { padding-top: 35px; scroll-margin-top: 110px; }
.article-section h2 { font-size: 23px; line-height: 1.5; margin-bottom: 17px; text-wrap: pretty; }
.article-section ul { padding-left: 23px; margin-block: 18px; }
.article-section li + li { margin-top: 9px; }
.notebook-code { margin-block: 22px; border: 1px solid var(--line); border-radius: 5px; overflow: hidden; background: var(--surface); }
.code-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 0 16px; min-height: 45px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.code-heading button { border: 0; background: transparent; min-height: 44px; padding: 8px 0 8px 15px; color: var(--accent); font-size: 13px; }
.notebook-code pre { overflow-x: auto; padding: 18px; margin: 0; font: 13px/1.8 Consolas, "Cascadia Code", monospace; tab-size: 2; }
.notebook-code pre:focus-visible { outline-offset: -3px; }
.notebook-callout { padding: 14px 18px; background: var(--accent-soft); border-left: 3px solid var(--accent); font-size: 15px; }
.article-colophon { border-top: 1px solid var(--line); padding-top: 22px; margin-top: 28px; color: var(--muted); font-size: 13px; }
.article-related { margin-top: 30px; padding: 23px; background: var(--surface); }
.article-related h2 { font-size: 18px; }
.article-related a { display: block; padding-block: 9px; font-size: 15px; }
.copy-status { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); z-index: 40; max-width: calc(100% - 40px); background: var(--ink); color: white; border-radius: 5px; padding: 9px 16px; font-size: 14px; }
.copy-status:empty { display: none; }
@media (max-width: 850px) {
  .notebook-intro { grid-template-columns: 1fr; gap: 28px; padding-top: 40px; }
  .notebook-margin { max-width: 650px; }
  .notebook-routes { grid-template-columns: 1fr; }
  .notebook-routes a { padding: 18px 8px; }
  .notebook-routes a + a { border-left: 0; border-top: 1px solid var(--line); }
  .article-layout { grid-template-columns: 1fr; gap: 28px; }
  .article-sidebar { position: static; }
  .article-directory > summary { display: list-item; cursor: pointer; padding-block: 11px; min-height: 44px; font-size: 14px; font-weight: 600; color: var(--accent); }
  .article-toc h2 { display: none; }
  .article-toc { padding-bottom: 20px; border-bottom: 1px solid var(--line); }
  .article-toc a { padding-block: 11px; }
  .journal-row { grid-template-columns: 118px minmax(0, 1fr); gap: 18px; }
  .journal-read { display: none; }
}
@media (max-width: 620px) {
  .notebook-page .wrap { width: calc(100% - 36px); }
  .notebook-intro { padding-block: 30px; }
  .notebook-intro h1 { font-size: 30px; }
  .notebook-lead { font-size: 16px; }
  .library-heading { display: block; }
  .library-heading > span { display: block; margin-top: 6px; }
  .notebook-search { flex-wrap: wrap; gap: 8px; }
  .notebook-search label { width: 100%; }
  .notebook-search input { flex: 1; }
  .notebook-filters { gap: 4px 13px; }
  .journal-row { display: block; padding-block: 23px; }
  .journal-meta { flex-direction: row; flex-wrap: wrap; gap: 7px 16px; margin-bottom: 10px; align-items: baseline; }
  .journal-meta time { margin-left: auto; }
  .journal-body h2 { font-size: 19px; }
  .article-heading { padding-top: 23px; }
  .article-heading h1 { font-size: 28px; }
  .article-deck { font-size: 16px; }
  .article-layout { padding-top: 26px; }
  .article-prose { font-size: 16px; }
  .article-section h2 { font-size: 21px; }
  .notebook-code pre { font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) { .notebook-routes a { transition: none; } }
@media print {
  .article-sidebar, .article-top, .notebook-tools, .code-heading button, .article-related, .copy-status { display: none !important; }
  .article-layout, .notebook-intro { display: block; }
  .article-prose, .wrap { max-width: none; width: 100%; }
  .article-heading, .article-layout { padding-block: 18px; }
  .notebook-code pre { white-space: pre-wrap; overflow-wrap: anywhere; }
  .article-section { break-inside: auto; }
  .article-section h2 { break-after: avoid; }
  .journal-row { break-inside: avoid; }
}