:root {
  --dsh-accent: #2455a4;
  --dsh-accent-strong: #173a75;
  --dsh-accent-soft: #eaf2ff;
  --dsh-rule: #ccd7e8;
  --dsh-muted: #5e6b7d;
  --dsh-code: #f5f7fa;
}

[data-md-color-scheme="slate"] {
  --dsh-accent: #70a7ff;
  --dsh-accent-strong: #9fc5ff;
  --dsh-accent-soft: #1a2941;
  --dsh-rule: #40516a;
  --dsh-muted: #b1bed0;
  --dsh-code: #1c2533;
}

body,
input {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.md-grid {
  max-width: 78rem;
}

.md-typeset {
  font-size: 0.78rem;
  line-height: 1.82;
}

.md-typeset h1 {
  color: var(--md-typeset-color);
  font-weight: 720;
  letter-spacing: -0.02em;
}

.md-typeset h2 {
  border-bottom: 1px solid var(--dsh-rule);
  padding-bottom: 0.35rem;
}

.md-typeset img {
  display: block;
  height: auto;
  margin: 1.1rem auto 0.45rem;
  max-width: 100%;
}

/* 表格块居中；表头和短标签列居中，说明文字继续左对齐。 */
.md-typeset__scrollwrap:has(> .md-typeset__table) {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.md-typeset__scrollwrap > .md-typeset__table {
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}

.md-typeset > table:not([class]) {
  margin-left: auto;
  margin-right: auto;
}

.md-typeset table:not([class]) th,
.md-typeset table:not([class]) td {
  vertical-align: middle;
}

.md-typeset table:not([class]) thead th:not([align]),
.md-typeset table:not([class]) tbody td:first-child:not([align]) {
  text-align: center;
}

/* 竖向界面截图保持接近真实面板的尺度，避免在宽屏上被异常放大。 */
.md-typeset img.book-portrait-screenshot {
  max-width: 18rem;
}

.md-typeset .prompt-title {
  color: #e45c5c;
  font-size: 1.1em;
  font-weight: 600;
}

.md-typeset blockquote:has(.prompt-title) p:not(:first-child) {
  white-space: pre-line;
}

/*
 * Material 在 960–1220px 之间默认隐藏全书目录、只保留本章目录。
 * 书稿预览更需要全书导航，因此在这一档宽度改为常驻左栏，
 * 并沿用桌面端的展开结构；本章目录由 toc.integrate 放在当前章下。
 */
@media screen and (min-width: 60em) and (max-width: 76.234375em) {
  .md-header__button[for="__drawer"] {
    display: none;
  }

  [dir="ltr"] .md-sidebar--primary,
  [dir="rtl"] .md-sidebar--primary {
    left: auto;
    right: auto;
  }

  .md-sidebar--primary {
    align-self: flex-start;
    background: transparent;
    box-shadow: none;
    display: block;
    height: calc(100vh - 2.4rem);
    position: sticky;
    top: 2.4rem;
    transform: none;
    transition: none;
    width: 12.1rem;
    z-index: auto;
  }

  .md-sidebar--primary .md-sidebar__scrollwrap {
    bottom: auto;
    height: 100%;
    left: auto;
    margin: 0 0.2rem;
    overflow-x: hidden;
    overflow-y: auto;
    position: static;
    right: auto;
    top: auto;
  }

  .md-sidebar--secondary {
    display: none !important;
  }

  .md-nav--primary {
    background: transparent;
    display: block;
    height: auto;
    position: static;
    transform: none;
    visibility: visible;
  }

  .md-nav--primary .md-nav:not(.md-nav--secondary) {
    background: transparent;
    display: grid;
    grid-template-rows: minmax(0.4rem, 0fr);
    height: auto;
    opacity: 0;
    position: static;
    transform: none;
    visibility: collapse;
  }

  .md-nav--primary
    .md-nav__toggle.md-toggle--indeterminate
    ~ .md-nav:not(.md-nav--secondary),
  .md-nav--primary
    .md-nav__toggle:checked
    ~ .md-nav:not(.md-nav--secondary) {
    grid-template-rows: minmax(0.4rem, 1fr);
    opacity: 1;
    visibility: visible;
  }

  .md-nav--primary .md-nav:not(.md-nav--secondary) > .md-nav__list {
    overflow: hidden;
  }

  .md-nav--primary > .md-nav__title {
    background: var(--md-default-bg-color);
    box-shadow: 0 0 0.4rem 0.4rem var(--md-default-bg-color);
    color: var(--md-default-fg-color--light);
    cursor: default;
    font-size: 0.7rem;
    height: auto;
    line-height: 1.3;
    padding: 0 0.6rem;
    position: sticky;
    top: 0;
    white-space: normal;
    z-index: 1;
  }

  .md-nav--primary > .md-nav__title .md-logo,
  .md-nav--primary > .md-nav__title .md-nav__icon {
    display: none;
  }

  [dir="ltr"] .md-nav--primary > .md-nav__list {
    padding-left: 0.6rem;
  }

  [dir="rtl"] .md-nav--primary > .md-nav__list {
    padding-right: 0.6rem;
  }

  .md-nav--primary .md-nav__item {
    border-top: 0;
    font-size: 0.7rem;
    line-height: 1.3;
  }

  .md-nav--primary .md-nav__link {
    margin-top: 0.625em;
    padding: 0;
  }

  .md-nav--primary .md-nav__item--nested > .md-nav > .md-nav__title {
    display: none;
  }

  .md-nav--primary .md-nav--secondary {
    background: transparent;
    border-left: 1px solid var(--md-primary-fg-color);
    display: none;
    height: auto;
    margin: 0.55rem 0 1.1rem;
    position: static;
    transform: none;
  }

  .md-nav--primary.md-nav--integrated
    > .md-nav__list
    > .md-nav__item--active
    .md-nav__item--active
    > .md-nav--secondary {
    display: block;
    opacity: 1;
    visibility: visible;
  }

  .md-nav--primary .md-nav--secondary > .md-nav__title {
    display: none;
  }

  .md-nav--primary .md-nav--secondary .md-nav__list {
    overflow: visible;
    padding: 0 0 0 0.6rem;
  }
}

/* 手机和平板抽屉稍宽一些，避免长章名被挤成三四行。 */
@media screen and (max-width: 59.984375em) {
  :root {
    --dsh-drawer-width: min(15rem, 82vw);
  }

  [dir="ltr"] .md-sidebar--primary {
    left: calc(-1 * var(--dsh-drawer-width));
  }

  [dir="rtl"] .md-sidebar--primary {
    right: calc(-1 * var(--dsh-drawer-width));
  }

  .md-sidebar--primary {
    width: var(--dsh-drawer-width);
  }

  [data-md-toggle="drawer"]:checked ~ .md-container .md-sidebar--primary {
    transform: translateX(var(--dsh-drawer-width));
  }

  [dir="rtl"]
    [data-md-toggle="drawer"]:checked
    ~ .md-container
    .md-sidebar--primary {
    transform: translateX(calc(-1 * var(--dsh-drawer-width)));
  }

  .md-nav--primary > .md-nav__title {
    min-height: 5.6rem;
    white-space: normal;
  }
}

.md-typeset figure.book-figure,
.md-typeset figure.book-diagram {
  margin: 1.6rem auto;
  max-width: 100%;
  text-align: center;
}

.md-typeset .book-figure-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.md-typeset .book-figure-grid figcaption {
  grid-column: 1 / -1;
}

.md-typeset .book-figure-grid img {
  margin: 0;
  width: 100%;
}

.md-typeset figcaption {
  color: var(--dsh-muted);
  font-size: 0.68rem;
  line-height: 1.55;
  margin-top: 0.65rem;
}

.book-diagram {
  background: linear-gradient(145deg, var(--dsh-code), transparent);
  border: 1px solid var(--dsh-rule);
  border-radius: 0.8rem;
  padding: 1.2rem;
}

.diagram-flow {
  align-items: center;
  display: flex;
  gap: 0.55rem;
  justify-content: center;
}

.diagram-flow-row {
  flex-wrap: wrap;
}

.diagram-flow-vertical,
.diagram-stack,
.diagram-context {
  flex-direction: column;
}

.diagram-stack,
.diagram-context {
  align-items: center;
  display: flex;
  gap: 0.45rem;
}

.diagram-node {
  background: var(--md-default-bg-color);
  border: 1px solid var(--dsh-accent);
  border-radius: 0.55rem;
  color: var(--md-typeset-color);
  min-width: 8.6rem;
  padding: 0.65rem 0.85rem;
  text-align: center;
}

.diagram-node small {
  color: var(--dsh-muted);
  display: block;
  margin-top: 0.2rem;
}

.diagram-node code {
  white-space: normal;
}

.diagram-node-accent {
  background: var(--dsh-accent-strong);
  border-color: var(--dsh-accent-strong);
  color: white;
}

.diagram-node-flat {
  background: var(--dsh-code);
  border-color: var(--dsh-rule);
}

.diagram-node-seam {
  background: var(--dsh-accent-soft);
  border-style: dashed;
}

.diagram-node-wide {
  max-width: 42rem;
  width: min(100%, 42rem);
}

.diagram-arrow {
  color: var(--dsh-accent);
  font-size: 1.2rem;
  font-weight: 700;
}

.diagram-loop,
.diagram-note,
.diagram-context-label {
  color: var(--dsh-muted);
  font-size: 0.68rem;
}

.diagram-note {
  margin-top: 0.8rem;
}

.diagram-branches {
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 0.25rem;
  width: 100%;
}

.diagram-context-label {
  display: flex;
  justify-content: space-between;
  max-width: 30rem;
  width: 100%;
}

.diagram-compare {
  align-items: center;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: auto repeat(2, minmax(0, 1fr));
}

.diagram-compare-label {
  color: var(--dsh-muted);
  font-weight: 700;
}

@media screen and (max-width: 44rem) {
  .md-typeset img.book-technical-figure {
    height: auto !important;
    width: 100% !important;
  }

  .md-typeset img.book-portrait-screenshot {
    width: min(72%, 18rem) !important;
  }

  .md-typeset .book-figure-grid,
  .diagram-branches {
    grid-template-columns: 1fr;
  }

  .diagram-compare {
    grid-template-columns: 1fr;
  }

  .diagram-flow-row {
    flex-direction: column;
  }

  .diagram-flow-row .diagram-arrow {
    transform: rotate(90deg);
  }
}