:root {
  --md-text-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --md-code-font: "SFMono-Regular", "SF Mono", Menlo, Consolas, monospace;
  --kb-display-font: "Songti SC", STSong, "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --kb-radius-sm: .45rem;
  --kb-radius-md: .75rem;
  --kb-radius-lg: 1.15rem;
  --kb-reading-progress: 0%;
}

/* Library: editorial reading desk, reusing the site's paper/ink palette. */
.kb-library-intro { border-left: .22rem solid var(--kb-accent); padding: .7rem 0 .7rem 1.25rem; margin: .6rem 0 1.5rem; }
.md-typeset .kb-library-intro h1 { font-family: var(--kb-display-font); font-size: clamp(1.7rem, 4vw, 2.4rem); color: var(--kb-ink); margin: .5rem 0; line-height: 1.3; }
.kb-library-eyebrow { display: block; font-size: .62rem; letter-spacing: .08em; color: var(--kb-ink-soft); }
.kb-library-stats { display:flex; flex-wrap:wrap; gap: 1rem 2rem; padding: .85rem 0; border-block: 1px solid var(--kb-line); color:var(--kb-ink-soft); font-size:.75rem; }
.kb-library-stats strong { color:var(--kb-ink); font-size:1.3rem; font-variant-numeric:tabular-nums; }
.kb-library-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:1rem; margin:1rem 0 2rem; }
.md-typeset a.kb-library-card { display:flex; flex-direction:column; padding:1.3rem; color:var(--kb-ink); background:var(--kb-paper); border:1px solid var(--kb-line); border-radius:.35rem; transition:border-color .15s, background .15s; }
.md-typeset a.kb-library-card:hover { border-color:var(--kb-accent); background:var(--kb-paper-muted); }
.kb-library-card h3 { font-family:var(--kb-display-font); margin:.65rem 0 .5rem; font-size:1.15rem; }
.kb-library-card p { color:var(--kb-ink-soft); font-size:.77rem; line-height:1.8; margin:.3rem 0 1.25rem; }
.kb-library-card__foot { display:flex; justify-content:space-between; margin-top:auto; padding-top:.65rem; border-top:1px solid var(--kb-line); font-size:.65rem; }
.kb-library-spotlight { background:var(--kb-paper-muted); border:1px solid var(--kb-line); padding:1.4rem; margin:1rem 0 1.7rem; }
.md-typeset .kb-library-spotlight h2 { margin:.5rem 0; font-family:var(--kb-display-font); }
.kb-library-spotlight div { display:flex; flex-wrap:wrap; gap:1.3rem; font-size:.8rem; }
.kb-reader-nav { display:flex; flex-wrap:wrap; justify-content:flex-start; align-items:center; gap:.45rem .65rem; padding:.75rem 0; border-block:1px solid var(--kb-line); font-size:.7rem; }
.md-typeset .kb-reader-nav a { padding:.2rem .45rem; border:1px solid var(--kb-line); border-radius:999px; }
.md-typeset .kb-reader-nav a:is(:hover, :focus-visible) { border-color:var(--kb-accent); background:var(--kb-accent-soft); }
.kb-reader-nav span { color:var(--kb-ink-soft); font-variant-numeric:tabular-nums; }
.kb-reader-meta { font-size:.65rem; line-height:1.8; color:var(--kb-ink-soft); }
.kb-source-ref { border-left:2px solid var(--kb-line-strong); padding:.35rem .7rem; margin:.75rem 0 1.2rem; font-size:.64rem; color:var(--kb-ink-soft); overflow-wrap:anywhere; }
.md-typeset pre.kb-transcript { white-space:pre-wrap; overflow-wrap:anywhere; word-break:normal; background:var(--kb-paper); color:var(--kb-ink); padding:1rem; border:1px solid var(--kb-line); font-family:var(--md-text-font); font-size:.75rem; line-height:1.9; }
.kb-source-missing { padding:.65rem; border-left:2px solid var(--kb-accent); background:var(--kb-accent-soft); font-size:.7rem; }
.kb-source-figure figcaption { font-size:.65rem; color:var(--kb-ink-soft); }
.kb-ai-result__source { font-size:.65rem; color:var(--kb-ink-soft); overflow-wrap:anywhere; }
@media(max-width:650px) { .kb-library-grid { grid-template-columns:1fr; } .kb-library-intro { padding-left:.8rem; } .md-typeset a.kb-library-card { padding:1rem; } }

[data-md-color-scheme="default"] {
  --md-primary-fg-color: #173a52;
  --md-primary-fg-color--light: #2f6077;
  --md-primary-fg-color--dark: #0e2738;
  --md-accent-fg-color: #ad4935;
  --md-typeset-a-color: #356d87;
  --md-default-bg-color: #f8f6f1;
  --kb-paper: #fffdf8;
  --kb-paper-muted: #f1ede4;
  --kb-ink: #21313a;
  --kb-ink-soft: #607079;
  --kb-line: rgba(27, 58, 74, .14);
  --kb-line-strong: rgba(27, 58, 74, .24);
  --kb-accent: #ad4935;
  --kb-accent-soft: rgba(173, 73, 53, .1);
  --kb-blue-soft: rgba(53, 109, 135, .1);
  --kb-shadow: 0 .7rem 2rem rgba(34, 48, 54, .08);
}

[data-md-color-scheme="slate"] {
  --md-primary-fg-color: #132f42;
  --md-primary-fg-color--light: #315f75;
  --md-primary-fg-color--dark: #0a1c28;
  --md-accent-fg-color: #f0a08c;
  --md-typeset-a-color: #8fc6da;
  --md-default-bg-color: #111a20;
  --md-default-fg-color: hsla(38, 28%, 92%, .92);
  --kb-paper: #18242b;
  --kb-paper-muted: #202f37;
  --kb-ink: #edf0ec;
  --kb-ink-soft: #aebbc0;
  --kb-line: rgba(211, 226, 225, .12);
  --kb-line-strong: rgba(211, 226, 225, .22);
  --kb-accent: #e88d77;
  --kb-accent-soft: rgba(232, 141, 119, .13);
  --kb-blue-soft: rgba(143, 198, 218, .11);
  --kb-shadow: 0 .8rem 2.2rem rgba(0, 0, 0, .24);
}

html {
  scrollbar-gutter: stable;
}

body {
  background-color: var(--md-default-bg-color);
  background-image:
    linear-gradient(rgba(42, 77, 91, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 77, 91, .018) 1px, transparent 1px);
  background-size: 2rem 2rem;
}

::selection {
  color: var(--kb-ink);
  background: rgba(225, 176, 83, .35);
}

.reading-progress {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  width: var(--kb-reading-progress);
  height: 3px;
  pointer-events: none;
  background: linear-gradient(90deg, #e4b355, var(--kb-accent));
  box-shadow: 0 0 .55rem rgba(228, 179, 85, .5);
  transition: width .08s linear;
}

.md-header {
  color: #fff;
  background: linear-gradient(118deg, #102d41 0%, #1b4a61 68%, #315f75 100%);
  box-shadow: 0 .15rem .8rem rgba(5, 25, 37, .2);
}

.md-tabs {
  color: rgba(255, 255, 255, .9);
  background: rgba(15, 44, 62, .97);
  border-top: 1px solid rgba(255, 255, 255, .08);
}

.md-tabs__link {
  font-weight: 500;
  opacity: .86;
  transition: color .18s ease, opacity .18s ease;
}

.md-tabs__link:focus-visible,
.md-tabs__link:hover,
.md-tabs__item--active > .md-tabs__link {
  color: #fff;
  opacity: 1;
}

.md-header__button.md-logo {
  color: #f0c86f;
}

.md-header__title {
  font-weight: 650;
  letter-spacing: .035em;
}

.kb-header-account {
  display: inline-flex;
  flex: 0 0 auto;
  gap: .3rem;
  align-items: center;
  min-height: 1.8rem;
  margin: 0 .2rem;
  padding: 0 .58rem;
  color: rgba(255, 255, 255, .9);
  font-size: .64rem;
  font-weight: 650;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 999px;
  transition: color .15s ease, background .15s ease, border-color .15s ease;
}

.kb-header-account svg {
  width: .92rem;
  height: .92rem;
  fill: currentColor;
}

.kb-header-account:is(:hover, :focus-visible),
.kb-header-account--active {
  color: #173a52;
  background: #f0c86f;
  border-color: #f0c86f;
}

.md-search__form {
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: .55rem;
}

.md-search__input::placeholder {
  color: rgba(255, 255, 255, .72);
}

.md-main__inner {
  margin-top: 1.1rem;
}

.md-content__inner {
  padding-bottom: 2.5rem;
}

.md-typeset {
  color: var(--kb-ink);
  font-size: .8rem;
  line-height: 1.88;
  letter-spacing: .008em;
  overflow-wrap: anywhere;
}

.md-typeset h1,
.md-typeset h2,
.md-typeset h3 {
  color: var(--kb-ink);
  font-family: var(--kb-display-font);
  font-weight: 700;
  letter-spacing: .018em;
  text-wrap: balance;
}

.md-typeset h1 {
  margin: 0 0 1.15em;
  font-size: clamp(1.75rem, 2.2vw, 2.2rem);
  line-height: 1.28;
}

.md-typeset h2 {
  position: relative;
  margin-top: 2.4em;
  padding-bottom: .42em;
  border-bottom: 1px solid var(--kb-line);
  font-size: 1.35rem;
}

.md-typeset h2::after {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 2.8rem;
  height: 2px;
  content: "";
  background: var(--kb-accent);
}

.md-typeset h3 {
  margin-top: 1.9em;
  font-size: 1.08rem;
}

.md-typeset p {
  text-align: justify;
  text-justify: inter-ideograph;
  text-wrap: pretty;
}

.md-typeset a {
  text-decoration-color: color-mix(in srgb, var(--md-typeset-a-color) 35%, transparent);
  text-decoration-thickness: .06em;
  text-underline-offset: .17em;
}

.md-typeset a:hover {
  text-decoration-color: currentColor;
}

.md-typeset strong {
  color: color-mix(in srgb, var(--kb-ink) 88%, var(--kb-accent));
}

.md-typeset blockquote {
  margin-inline: 0;
  padding: .2rem 1rem;
  color: var(--kb-ink-soft);
  background: var(--kb-blue-soft);
  border-left: .2rem solid var(--md-typeset-a-color);
  border-radius: 0 var(--kb-radius-sm) var(--kb-radius-sm) 0;
}

.md-typeset hr {
  border-color: var(--kb-line);
}

.md-nav {
  font-size: .7rem;
}

.md-nav__title {
  color: var(--kb-ink-soft);
  font-weight: 650;
  letter-spacing: .025em;
}

.md-nav__link {
  line-height: 1.45;
}

.md-nav__link--active {
  font-weight: 650;
}

.md-typeset .admonition,
.md-typeset details {
  overflow: clip;
  font-size: .76rem;
  background: var(--kb-paper);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-md);
  box-shadow: 0 .25rem .85rem rgba(28, 45, 52, .045);
}

.md-typeset .admonition-title,
.md-typeset summary {
  font-weight: 650;
}

.md-typeset details[open] {
  box-shadow: var(--kb-shadow);
}

.md-typeset summary {
  transition: background-color .16s ease;
}

.md-typeset summary:hover {
  background-color: var(--kb-blue-soft);
}

.md-typeset code {
  border-radius: .28rem;
}

.md-typeset pre > code {
  line-height: 1.68;
}

.md-typeset .highlight,
.md-typeset pre {
  border-radius: var(--kb-radius-md);
}

[data-md-color-scheme="default"] .highlight :is(.c, .ch, .cm, .c1, .cs, .cp, .cpf) {
  color: #536b76;
}

[data-md-color-scheme="slate"] .highlight :is(.c, .ch, .cm, .c1, .cs, .cp, .cpf) {
  color: #a7bec7;
}

.md-typeset__scrollwrap {
  max-width: 100%;
  margin: 1.15em 0;
}

.md-typeset__table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-md);
  box-shadow: 0 .2rem .65rem rgba(26, 45, 54, .04);
  -webkit-overflow-scrolling: touch;
}

.md-typeset table:not([class]) {
  display: table;
  width: max-content;
  min-width: 100%;
  max-width: none;
  margin: 0;
  font-size: .72rem;
  background: var(--kb-paper);
}

.md-typeset table:not([class]) th {
  color: var(--kb-ink);
  font-weight: 650;
  background: var(--kb-paper-muted);
}

.md-typeset table:not([class]) td,
.md-typeset table:not([class]) th {
  padding: .58em .75em;
  border-color: var(--kb-line);
  vertical-align: top;
}

.md-typeset table:not([class]) tbody tr {
  transition: background-color .14s ease;
}

.md-typeset table:not([class]) tbody tr:hover {
  background: var(--kb-blue-soft);
}

.md-typeset img {
  max-width: 100%;
  height: auto;
  max-height: 78vh;
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-sm);
  box-shadow: 0 .2rem .8rem rgba(20, 36, 43, .11);
}

.md-typeset img.kb-inline-symbol {
  display: inline-block;
  width: 1.1em;
  height: 1.1em;
  max-height: none;
  margin: 0 .08em;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  vertical-align: -.12em;
}

.md-typeset .arithmatex img,
.md-typeset .MathJax_SVG img,
.md-typeset img[src*="/remote/formula/"] {
  display: inline-block;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: none;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  vertical-align: middle;
}

.md-typeset mjx-container {
  max-width: 100%;
}

.md-typeset mjx-container:not([display="true"]) {
  display: inline-block;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  vertical-align: middle;
}

.md-typeset mjx-container[display="true"] {
  max-width: 100%;
  padding: .3em 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.md-typeset mjx-assistive-mml {
  max-width: 1px;
  max-height: 1px;
  overflow: hidden !important;
}

.kb-missing-asset {
  display: inline-flex;
  gap: .35rem;
  align-items: center;
  padding: .35rem .6rem;
  color: var(--kb-accent);
  font-size: .7rem;
  background: var(--kb-accent-soft);
  border: 1px dashed color-mix(in srgb, var(--kb-accent) 45%, transparent);
  border-radius: var(--kb-radius-sm);
}

.grid.cards > ul {
  gap: .8rem;
}

.grid.cards > ul > li {
  position: relative;
  min-height: 10.25rem;
  padding: 1rem 1.05rem .9rem;
  overflow: hidden;
  background: var(--kb-paper);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-md);
  box-shadow: 0 .22rem .75rem rgba(30, 47, 55, .045);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.grid.cards > ul > li::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  content: "";
  background: var(--kb-accent);
  opacity: .58;
}

.grid.cards > ul > li:hover,
.grid.cards > ul > li:focus-within {
  z-index: 1;
  border-color: var(--kb-line-strong);
  box-shadow: var(--kb-shadow);
}

.grid.cards .twemoji,
.grid.cards .emojione {
  color: var(--kb-accent);
}

.grid.cards .lg {
  width: 1.55rem;
  height: 1.55rem;
  margin-right: .25rem;
  padding: .25rem;
  color: var(--kb-accent);
  background: var(--kb-accent-soft);
  border-radius: .45rem;
}

.grid.cards hr {
  margin-block: .65rem;
}

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

.kb-card-link::after {
  position: absolute;
  inset: 0;
  content: "";
}

.kb-card-link {
  font-weight: 650;
}

.kb-hero {
  position: relative;
  isolation: isolate;
  margin: 0 0 2rem;
  padding: clamp(1.35rem, 4vw, 2.3rem);
  overflow: hidden;
  color: var(--kb-ink);
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--kb-accent) 8%, transparent) 1px, transparent 1px),
    linear-gradient(color-mix(in srgb, var(--kb-accent) 7%, transparent) 1px, transparent 1px),
    var(--kb-paper);
  background-size: 1.5rem 1.5rem;
  border: 1px solid var(--kb-line-strong);
  border-left: .24rem solid var(--kb-accent);
  border-radius: var(--kb-radius-lg);
  box-shadow: var(--kb-shadow);
}

.kb-hero::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  content: "";
  background: linear-gradient(95deg, var(--kb-paper) 12%, transparent 75%);
}

.kb-hero::after {
  position: absolute;
  z-index: 0;
  top: 1.35rem;
  right: 1.35rem;
  display: grid;
  width: 3.35rem;
  height: 3.35rem;
  place-items: center;
  content: "408";
  color: var(--kb-accent);
  font: 750 .84rem/1 var(--md-code-font);
  letter-spacing: .08em;
  border: 1px solid color-mix(in srgb, var(--kb-accent) 52%, transparent);
  border-radius: 50%;
  opacity: .68;
  transform: rotate(-5deg);
}

.kb-hero h1 {
  max-width: 12ch;
  margin: .25rem 0 .55rem;
  color: var(--kb-ink);
  font-size: clamp(2rem, 5vw, 3.35rem);
  letter-spacing: .05em;
}

.kb-hero p {
  max-width: 39rem;
  margin: 0;
  color: var(--kb-ink-soft);
  font-size: .84rem;
  text-align: left;
}

.kb-hero__eyebrow {
  display: inline-flex;
  gap: .4rem;
  align-items: center;
  color: var(--kb-accent);
  font: 650 .64rem/1.4 var(--md-code-font);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.kb-hero__eyebrow::before {
  width: 1.5rem;
  height: 1px;
  content: "";
  background: currentColor;
}

.kb-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-top: 1.1rem;
}

.kb-hero .md-button {
  padding: .48rem .85rem;
  color: var(--kb-ink);
  font-size: .7rem;
  border-color: var(--kb-line-strong);
  border-radius: 999px;
}

.kb-hero .md-button--primary {
  color: #fff;
  background: var(--kb-accent);
  border-color: var(--kb-accent);
}

[data-md-color-scheme="slate"] .kb-hero .md-button--primary {
  color: #111a20;
}

.kb-hero .md-button:hover,
.kb-hero .md-button:focus-visible {
  color: var(--kb-ink);
  background: var(--kb-paper-muted);
  border-color: var(--kb-accent);
}

.kb-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .5rem;
  max-width: 30rem;
  margin-top: 1.35rem;
}

.kb-stat {
  padding: .55rem .65rem;
  background: color-mix(in srgb, var(--kb-paper-muted) 78%, transparent);
  border: 1px solid var(--kb-line);
  border-radius: .6rem;
}

.kb-stat strong {
  display: block;
  color: var(--kb-ink);
  font: 700 1.05rem/1.2 var(--md-code-font);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.kb-stat span {
  color: var(--kb-ink-soft);
  font-size: .62rem;
}

.kb-section-lead {
  max-width: 44rem;
  color: var(--kb-ink-soft);
}

.kb-subject-links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .65rem;
  margin: 1rem 0 2rem;
}

.md-typeset .kb-subject-links a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .12rem .55rem;
  padding: .85rem;
  color: var(--kb-ink);
  background: var(--kb-paper);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-sm);
}

.md-typeset .kb-subject-links a:is(:hover, :focus-visible) {
  border-color: var(--kb-accent);
  box-shadow: 0 .25rem .8rem rgba(30, 47, 55, .06);
}

.kb-subject-links span {
  grid-row: 1 / 3;
  color: var(--kb-accent);
  font: 700 .56rem/1.4 var(--md-code-font);
}

.kb-subject-links strong {
  font-size: .75rem;
}

.kb-subject-links small {
  color: var(--kb-ink-soft);
  font-size: .56rem;
  line-height: 1.5;
}

.md-typeset .kb-more-links {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem 1rem;
  align-items: center;
  margin: 1.2rem 0 0;
  padding: .8rem 0;
  font-size: .7rem;
  border-block: 1px solid var(--kb-line);
}

.kb-ai-hero {
  position: relative;
  isolation: isolate;
  margin: 0 0 1rem;
  padding: clamp(1.2rem, 3vw, 2rem);
  overflow: hidden;
  color: #eef8f5;
  background:
    linear-gradient(105deg, rgba(240, 200, 111, .11), transparent 38%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .025) 0 1px, transparent 1px 4rem),
    #0c2c35;
  border: 1px solid rgba(240, 200, 111, .35);
  border-radius: var(--kb-radius-lg);
  box-shadow: 0 1rem 2.2rem rgba(7, 33, 42, .2);
}

.kb-ai-hero::after {
  position: absolute;
  z-index: -1;
  top: -3rem;
  right: -2rem;
  width: 14rem;
  height: 14rem;
  content: "⌕";
  color: rgba(240, 200, 111, .08);
  font: 300 13rem/1 Georgia, serif;
}

.kb-ai-hero h1 {
  margin: .2rem 0 .45rem;
  color: #fff;
  font-size: clamp(1.9rem, 5vw, 3rem);
  letter-spacing: .06em;
}

.kb-ai-hero p {
  max-width: 44rem;
  margin: 0;
  color: rgba(238, 248, 245, .76);
  text-align: left;
}

.kb-ai-hero__eyebrow {
  color: #f0c86f;
  font: 700 .6rem/1.4 var(--md-code-font);
  letter-spacing: .14em;
}

.kb-ai-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-top: 1rem;
}

.kb-ai-hero__chips span {
  padding: .22rem .55rem;
  color: rgba(255, 255, 255, .86);
  font: 600 .57rem/1.4 var(--md-code-font);
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 999px;
}

.kb-ai-console {
  display: grid;
  grid-template-columns: 2.35rem minmax(0, 1fr);
  margin: 1rem 0 2rem;
  overflow: hidden;
  background: var(--kb-paper);
  border: 1px solid var(--kb-line-strong);
  border-radius: var(--kb-radius-lg);
  box-shadow: var(--kb-shadow);
}

.kb-ai-console__rail {
  display: flex;
  flex-direction: column;
  gap: .7rem;
  align-items: center;
  padding-top: 1.1rem;
  color: rgba(255, 255, 255, .72);
  font: 700 .55rem/1 var(--md-code-font);
  letter-spacing: .12em;
  background: #16485a;
}

.kb-ai-console__rail span:last-child {
  writing-mode: vertical-rl;
}

.kb-ai-console__body {
  min-width: 0;
  padding: clamp(.85rem, 2.5vw, 1.35rem);
}

.kb-ai-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(9rem, .28fr);
  gap: .75rem;
  align-items: end;
}

.kb-ai-form__query {
  grid-row: span 2;
}

.md-typeset .kb-ai-form label {
  display: grid;
  gap: .28rem;
  margin: 0;
  color: var(--kb-ink-soft);
  font-size: .64rem;
  font-weight: 700;
}

.md-typeset .kb-ai-form :is(textarea, select) {
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
  margin: 0;
  padding: .68rem .75rem;
  color: var(--kb-ink);
  font: 500 .76rem/1.55 var(--md-text-font);
  background: var(--md-default-bg-color);
  border: 1px solid var(--kb-line-strong);
  border-radius: var(--kb-radius-sm);
  resize: vertical;
}

.md-typeset .kb-ai-form select {
  height: 2.45rem;
  padding-block: 0;
}

.md-typeset .kb-ai-form :is(textarea, select):focus {
  border-color: var(--kb-accent);
  outline: 3px solid color-mix(in srgb, var(--kb-accent) 18%, transparent);
}

.md-typeset .kb-ai-form .md-button {
  width: 100%;
  margin: 0;
  padding: .52rem .8rem;
  border-radius: 999px;
}

.kb-ai-examples {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  align-items: center;
  margin-top: .85rem;
  color: var(--kb-ink-soft);
  font-size: .62rem;
}

.kb-ai-examples button {
  padding: .22rem .5rem;
  color: var(--kb-ink);
  font: 600 .59rem/1.4 var(--md-text-font);
  background: var(--kb-paper-muted);
  border: 1px solid var(--kb-line);
  border-radius: 999px;
  cursor: pointer;
}

.kb-ai-examples button:hover,
.kb-ai-examples button:focus-visible {
  color: var(--kb-accent);
  border-color: var(--kb-accent);
}

.kb-ai-status {
  min-height: 1.5em;
  margin: .85rem 0 0;
  color: var(--kb-ink-soft);
  font-size: .68rem;
  text-align: left !important;
}

.kb-ai-console[data-kb-loading="true"] .kb-ai-status::before {
  display: inline-block;
  width: .55rem;
  height: .55rem;
  margin-right: .4rem;
  content: "";
  border: 2px solid var(--kb-line-strong);
  border-top-color: var(--kb-accent);
  border-radius: 50%;
  animation: kb-ai-spin .7s linear infinite;
}

@keyframes kb-ai-spin { to { transform: rotate(1turn); } }

.kb-ai-results {
  display: grid;
  gap: .55rem;
  margin-top: .7rem;
}

.kb-ai-result {
  padding: .72rem .8rem;
  background: color-mix(in srgb, var(--kb-paper) 92%, var(--kb-blue-soft));
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-md);
}

.kb-ai-result header {
  display: grid;
  grid-template-columns: 1.7rem minmax(0, 1fr) max-content;
  gap: .5rem;
  align-items: baseline;
}

.kb-ai-result__position {
  color: var(--kb-accent);
  font: 750 .62rem/1 var(--md-code-font);
}

.md-typeset .kb-ai-result h3 {
  margin: 0;
  font-family: var(--md-text-font);
  font-size: .82rem;
}

.kb-ai-result__badge {
  padding: .12rem .38rem;
  color: var(--kb-accent);
  font: 700 .52rem/1.4 var(--md-code-font);
  background: var(--kb-accent-soft);
  border-radius: 999px;
}

.md-typeset .kb-ai-result__snippet {
  margin: .45rem 0;
  color: var(--kb-ink-soft);
  font-size: .68rem;
  line-height: 1.65;
  text-align: left;
}

.kb-ai-result footer {
  display: flex;
  gap: .6rem;
  align-items: baseline;
  justify-content: space-between;
  padding-top: .45rem;
  border-top: 1px solid var(--kb-line);
}

.kb-ai-result footer small {
  color: var(--kb-ink-soft);
  font-size: .55rem;
}

.kb-ai-result footer a {
  flex: 0 0 auto;
  font-size: .62rem;
  font-weight: 700;
}

.kb-ai-handoff {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin: 1rem 0;
  padding: .85rem 1rem;
  background: linear-gradient(100deg, var(--kb-accent-soft), transparent);
  border: 1px dashed color-mix(in srgb, var(--kb-accent) 48%, var(--kb-line));
  border-radius: var(--kb-radius-md);
}

.kb-auth-shell {
  display: grid;
  grid-template-columns: minmax(15rem, .72fr) minmax(20rem, 1.28fr);
  margin: .8rem 0 1.8rem;
  overflow: hidden;
  background: var(--kb-paper);
  border: 1px solid var(--kb-line-strong);
  border-radius: var(--kb-radius-lg);
  box-shadow: var(--kb-shadow);
}

.kb-auth-shell [hidden] {
  display: none !important;
}

.kb-auth-intro {
  position: relative;
  padding: clamp(1.2rem, 3vw, 2rem);
  overflow: hidden;
  color: #ecf7f4;
  background:
    linear-gradient(145deg, rgba(240, 200, 111, .12), transparent 48%),
    #103746;
}

.kb-auth-intro::after {
  position: absolute;
  right: -2rem;
  bottom: -4.5rem;
  content: "4";
  color: rgba(255, 255, 255, .055);
  font: 800 12rem/1 var(--md-code-font);
}

.kb-auth-intro__eyebrow {
  color: #f0c86f;
  font: 700 .58rem/1.5 var(--md-code-font);
  letter-spacing: .12em;
}

.md-typeset .kb-auth-intro h1 {
  margin: .3rem 0 .6rem;
  color: #fff;
  font-size: clamp(1.7rem, 4vw, 2.65rem);
}

.md-typeset .kb-auth-intro p {
  margin: 0;
  color: rgba(236, 247, 244, .76);
  font-size: .72rem;
  line-height: 1.75;
  text-align: left;
}

.kb-auth-intro ol {
  position: relative;
  z-index: 1;
  display: grid;
  gap: .6rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.kb-auth-intro li {
  display: flex;
  gap: .55rem;
  align-items: center;
  font-size: .65rem;
}

.kb-auth-intro li span {
  color: #f0c86f;
  font: 700 .55rem/1 var(--md-code-font);
}

.md-typeset .kb-auth-intro .kb-auth-contact {
  position: relative;
  z-index: 1;
  margin-top: 1.2rem;
  padding-top: .8rem;
  border-top: 1px solid rgba(236, 247, 244, .16);
}

.md-typeset .kb-auth-intro .kb-auth-contact a {
  color: #f0c86f;
  font-weight: 700;
  overflow-wrap: anywhere;
  text-decoration: underline;
  text-decoration-color: rgba(240, 200, 111, .45);
  text-underline-offset: .16em;
}

.md-typeset .kb-auth-intro .kb-auth-contact a:is(:hover, :focus-visible) {
  color: #fff;
  text-decoration-color: currentColor;
}

.kb-auth-forms {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--kb-line);
}

.kb-auth-forms > section {
  padding: clamp(1rem, 2.5vw, 1.45rem);
  background: var(--kb-paper);
}

.md-typeset .kb-auth-forms h2,
.md-typeset .kb-auth-activation h2,
.md-typeset .kb-auth-account h2 {
  margin: 0 0 .8rem;
  font-family: var(--md-text-font);
  font-size: 1rem;
}

.kb-auth-forms form,
.kb-auth-activation form {
  display: grid;
  gap: .65rem;
}

.md-typeset .kb-auth-forms label,
.md-typeset .kb-auth-activation label {
  display: grid;
  gap: .25rem;
  margin: 0;
  color: var(--kb-ink-soft);
  font-size: .62rem;
  font-weight: 700;
}

.md-typeset .kb-auth-forms input,
.md-typeset .kb-auth-activation input {
  box-sizing: border-box;
  width: 100%;
  height: 2.35rem;
  padding: 0 .65rem;
  color: var(--kb-ink);
  font: 500 .73rem/1 var(--md-text-font);
  background: var(--md-default-bg-color);
  border: 1px solid var(--kb-line-strong);
  border-radius: var(--kb-radius-sm);
}

.md-typeset .kb-auth-forms input:focus,
.md-typeset .kb-auth-activation input:focus {
  border-color: var(--kb-accent);
  outline: 3px solid color-mix(in srgb, var(--kb-accent) 18%, transparent);
}

.md-typeset .kb-auth-forms .md-button,
.md-typeset .kb-auth-activation form .md-button {
  width: 100%;
  margin: .15rem 0 0;
  border-radius: 999px;
}

.kb-auth-activation,
.kb-auth-account {
  padding: clamp(1.1rem, 3vw, 1.8rem);
}

.kb-auth-activation form {
  margin-top: .9rem;
}

.kb-auth-account__mark {
  display: inline-block;
  margin-bottom: .45rem;
  padding: .18rem .5rem;
  color: var(--kb-accent);
  font: 700 .55rem/1.4 var(--md-code-font);
  background: var(--kb-accent-soft);
  border-radius: 999px;
}

.kb-auth-account__mark--pending {
  color: #8a5a00;
  background: rgba(240, 200, 111, .22);
}

[data-md-color-scheme="slate"] .kb-auth-account__mark--pending {
  color: #f0c86f;
}

.md-typeset .kb-auth-activation > p,
.md-typeset .kb-auth-account > p {
  color: var(--kb-ink-soft);
  font-size: .7rem;
  text-align: left;
}

.kb-auth-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: .8rem;
}

.md-typeset .kb-auth-actions .md-button {
  margin: 0;
  border-radius: 999px;
}

.md-typeset .kb-auth-token {
  margin-top: 1rem;
  font-size: .68rem;
}

.kb-auth-token pre {
  max-width: 100%;
  margin-top: .7rem;
  padding: .7rem;
  overflow-x: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  user-select: all;
}

.kb-auth-status {
  grid-column: 2;
  margin: 0 !important;
  padding: .6rem 1rem;
  color: var(--kb-ink-soft);
  font-size: .62rem;
  text-align: left !important;
  background: var(--kb-paper-muted);
  border-top: 1px solid var(--kb-line);
}

.kb-ai-handoff strong {
  color: var(--kb-accent);
  font-size: .7rem;
}

.md-typeset .kb-ai-handoff p {
  margin: .28rem 0 0;
  font-size: .68rem;
  line-height: 1.6;
  text-align: left;
}

.md-typeset .kb-ai-handoff .md-button {
  flex: 0 0 auto;
  margin: 0;
  border-radius: 999px;
}

.kb-page-tools {
  margin: -1rem 0 1.4rem;
  padding: .55rem .75rem;
  color: var(--kb-ink-soft);
  font-size: .72rem;
  background: var(--kb-paper-muted);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-sm);
}

.kb-prose-panel {
  margin: 1em 0;
  padding: .8rem 1rem;
  color: var(--kb-ink);
  background: var(--kb-paper-muted);
  border: 1px solid var(--kb-line);
  border-left: .18rem solid var(--kb-accent);
  border-radius: var(--kb-radius-md);
}

.kb-prose-panel > :first-child {
  margin-top: 0;
}

.kb-prose-panel > :last-child {
  margin-bottom: 0;
}

.kb-query-panel {
  margin: 1.25rem 0 2rem;
  padding: clamp(.85rem, 2.4vw, 1.25rem);
  background: linear-gradient(145deg, var(--kb-paper), color-mix(in srgb, var(--kb-paper) 91%, var(--kb-blue-soft)));
  border: 1px solid var(--kb-line-strong);
  border-radius: var(--kb-radius-lg);
  box-shadow: var(--kb-shadow);
}

.kb-query-form {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem;
  align-items: end;
}

.kb-query-form--school {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.md-typeset .kb-query-form label {
  display: grid;
  gap: .28rem;
  margin: 0;
  color: var(--kb-ink-soft);
  font-size: .66rem;
  font-weight: 650;
}

.md-typeset .kb-query-form :is(input, select) {
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
  height: 2.45rem;
  margin: 0;
  padding: 0 .68rem;
  color: var(--kb-ink);
  font: 500 .76rem/1.2 var(--md-text-font);
  background: var(--md-default-bg-color);
  border: 1px solid var(--kb-line-strong);
  border-radius: var(--kb-radius-sm);
  appearance: auto;
}

.md-typeset .kb-query-form :is(input, select):focus {
  border-color: var(--md-typeset-a-color);
  outline: 3px solid color-mix(in srgb, var(--md-typeset-a-color) 18%, transparent);
}

.kb-query-actions {
  display: flex;
  grid-column: 1 / -1;
  flex-wrap: wrap;
  gap: .55rem;
}

.md-typeset .kb-query-actions .md-button {
  margin: 0;
  padding: .48rem .82rem;
  font-size: .7rem;
  border-radius: 999px;
}

.kb-query-status {
  min-height: 1.5em;
  margin: .85rem 0 0;
  color: var(--kb-ink-soft);
  font-size: .7rem;
  text-align: left !important;
}

.kb-school-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
  margin-top: .85rem;
}

.kb-school-card {
  min-width: 0;
  padding: .85rem;
  background: var(--md-default-bg-color);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-md);
}

.kb-school-card > header {
  display: flex;
  gap: .6rem;
  align-items: flex-start;
  justify-content: space-between;
}

.md-typeset .kb-school-card h3 {
  margin: 0;
  font-family: var(--md-text-font);
  font-size: .9rem;
  overflow-wrap: anywhere;
}

.kb-school-badge {
  flex: 0 0 auto;
  padding: .14rem .42rem;
  color: var(--kb-accent);
  font: 700 .58rem/1.35 var(--md-code-font);
  background: var(--kb-accent-soft);
  border-radius: 999px;
}

.md-typeset .kb-school-major {
  margin: .42rem 0 .65rem;
  color: var(--kb-ink-soft);
  font-size: .7rem;
  line-height: 1.55;
  text-align: left;
}

.kb-school-card dl {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: .28rem .55rem;
  margin: 0;
  font-size: .67rem;
  line-height: 1.55;
}

.kb-school-card dt {
  color: var(--kb-ink-soft);
  font-weight: 650;
}

.kb-school-card dd {
  min-width: 0;
  margin: 0;
  white-space: pre-line;
  overflow-wrap: anywhere;
}

.md-typeset .kb-school-card details {
  margin: .7rem 0 0;
  padding: .45rem .55rem;
  font-size: .65rem;
  background: var(--kb-paper-muted);
  border-color: var(--kb-line);
  box-shadow: none;
}

.md-typeset .kb-school-card details p {
  margin: .45rem 0 0;
  white-space: pre-line;
}

.kb-school-card footer {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .65rem;
  align-items: baseline;
  margin-top: .65rem;
  padding-top: .55rem;
  border-top: 1px solid var(--kb-line);
}

.kb-school-card footer small {
  margin-left: auto;
  color: var(--kb-ink-soft);
  font-size: .56rem;
}

a:focus-visible,
button:focus-visible,
[tabindex="0"]:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--kb-accent) 72%, #fff);
  outline-offset: 3px;
}

@media screen and (max-width: 76.1875em) {
  .kb-header-account span {
    display: none;
  }

  .kb-header-account {
    width: 1.8rem;
    justify-content: center;
    padding: 0;
  }

  .md-typeset {
    font-size: .82rem;
  }

  .md-typeset table:not([class]) {
    font-size: .7rem;
  }
}

@media screen and (max-width: 44.984375em) {
  html {
    scrollbar-gutter: auto;
  }

  body {
    background-size: 1.5rem 1.5rem;
  }

  .md-main__inner {
    margin-top: .6rem;
  }

  .md-content__inner {
    margin: 0 .8rem;
  }

  .md-typeset {
    font-size: .8rem;
    line-height: 1.82;
    letter-spacing: 0;
  }

  .md-typeset h1 {
    margin-bottom: .9em;
    font-size: clamp(1.55rem, 8vw, 2rem);
    line-height: 1.32;
  }

  .md-typeset h2 {
    margin-top: 2em;
    font-size: 1.25rem;
  }

  .md-typeset p {
    text-align: left;
  }

  .md-typeset .admonition,
  .md-typeset details {
    margin-inline: 0;
  }

  .md-typeset table:not([class]) {
    font-size: .68rem;
  }

  .md-typeset table:not([class]) td,
  .md-typeset table:not([class]) th {
    padding: .5em .6em;
  }

  .grid.cards > ul {
    grid-template-columns: 1fr;
  }

  .grid.cards > ul > li {
    min-height: 0;
    padding: .9rem;
  }

  .kb-query-form,
  .kb-query-form--school,
  .kb-school-results,
  .kb-ai-form {
    grid-template-columns: 1fr;
  }

  .kb-ai-form__query {
    grid-row: auto;
  }

  .kb-ai-console {
    grid-template-columns: 1.65rem minmax(0, 1fr);
  }

  .kb-ai-console__rail {
    padding-top: .9rem;
  }

  .kb-ai-result header {
    grid-template-columns: 1.55rem minmax(0, 1fr);
  }

  .kb-ai-result__badge {
    grid-column: 2;
    justify-self: start;
  }

  .kb-ai-result footer,
  .kb-ai-handoff {
    align-items: flex-start;
    flex-direction: column;
  }

  .kb-auth-shell,
  .kb-auth-forms {
    grid-template-columns: 1fr;
  }

  .kb-auth-status {
    grid-column: 1;
  }

  .kb-query-actions .md-button {
    flex: 1 1 8rem;
    text-align: center;
  }

  .kb-school-card footer small {
    flex-basis: 100%;
    margin-left: 0;
  }

  .kb-hero {
    margin-inline: -.25rem;
    margin-bottom: 1.25rem;
    padding: 1.1rem 1rem;
    border-radius: .9rem;
  }

  .kb-hero::after {
    display: none;
  }

  .kb-hero p {
    font-size: .76rem;
  }

  .kb-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: .9rem;
  }

  .kb-stat {
    padding: .5rem .45rem;
  }

  .kb-stat strong {
    font-size: .9rem;
  }

  .kb-stat span {
    font-size: .56rem;
  }

  .kb-hero__actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .45rem;
    margin-top: .9rem;
  }

  .kb-hero .md-button {
    padding-inline: .5rem;
    text-align: center;
  }

  .kb-subject-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media screen and (max-width: 22.5em) {
  .md-content__inner {
    margin-inline: .8rem;
  }

  .kb-hero__actions {
    display: grid;
  }

  .kb-hero .md-button {
    text-align: center;
  }

  .kb-subject-links {
    grid-template-columns: 1fr;
  }
}

/* 近年 408 整卷：稳定题号、科目标签和长题干阅读样式。 */
.exam-paper__jumps {
  margin: 1rem 0 1.5rem;
  padding: .8rem 1rem;
  border: 1px solid var(--kb-line);
  border-radius: .7rem;
  background: color-mix(in srgb, var(--kb-paper-muted) 80%, transparent);
  line-height: 1.9;
}

.exam-paper h3 {
  scroll-margin-top: 5.5rem;
  padding-top: .55rem;
  border-top: 1px solid var(--kb-line);
}

.exam-subject {
  display: inline-flex;
  align-items: center;
  margin-left: .45rem;
  padding: .15rem .5rem;
  border: 1px solid color-mix(in srgb, var(--md-accent-fg-color) 32%, transparent);
  border-radius: 999px;
  color: var(--md-accent-fg-color);
  background: color-mix(in srgb, var(--md-accent-fg-color) 8%, transparent);
  font-family: var(--md-text-font-family);
  font-size: .62em;
  font-weight: 650;
  line-height: 1.35;
  vertical-align: .14em;
}

.exam-paper pre > code.language-text {
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  font-family: var(--md-text-font-family);
  font-size: .92em;
  line-height: 1.75;
}

.exam-paper img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  margin: 1rem auto;
  border: 1px solid var(--kb-line);
  border-radius: .55rem;
  background: #fff;
}

.exam-paper__topics {
  margin-top: .9rem;
  color: var(--kb-ink-soft);
  font-size: .88em;
}

@media screen and (max-width: 40rem) {
  .exam-paper__jumps {
    padding: .7rem .8rem;
  }

  .exam-paper h3 {
    line-height: 1.55;
  }

  .exam-subject {
    margin-left: .25rem;
    font-size: .58em;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

@media print {
  :root,
  [data-md-color-scheme="slate"] {
    --md-default-bg-color: #fff;
    --md-default-fg-color: #111;
    --md-typeset-a-color: #174f6b;
    --kb-paper: #fff;
    --kb-paper-muted: #f3f3f3;
    --kb-ink: #111;
    --kb-ink-soft: #444;
    --kb-line: rgba(0, 0, 0, .2);
    --kb-line-strong: rgba(0, 0, 0, .35);
    --kb-shadow: none;
  }

  body {
    background: #fff;
  }

  .reading-progress,
  .md-header,
  .md-tabs,
  .md-sidebar,
  .md-footer {
    display: none !important;
  }

  .md-main__inner,
  .md-content {
    max-width: none;
    margin: 0;
  }

  .md-typeset {
    color: #111;
    font-size: 10pt;
  }

  .md-typeset :is(h1, h2, h3, strong, th, td),
  .md-typeset .admonition,
  .md-typeset details {
    color: #111;
  }

  .md-typeset :is(table:not([class]), .admonition, details) {
    background: #fff;
    box-shadow: none;
  }

  .md-typeset__scrollwrap,
  .md-typeset__table {
    overflow: visible;
    border: 0;
  }

  .md-typeset table:not([class]) {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    table-layout: fixed;
    font-size: 8pt;
  }

  .md-typeset table:not([class]) th,
  .md-typeset table:not([class]) td {
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .md-typeset table:not([class]) th,
  .md-typeset :is(.admonition-title, summary) {
    color: #111;
    background: #f3f3f3;
  }
}