.diagram-header {
  border-bottom: 1px solid var(--line);
  background: rgb(249 247 241 / 86%);
  backdrop-filter: blur(18px);
}

.diagram-nav,
.diagram-main,
.diagram-footer {
  width: min(96rem, calc(100% - 3rem));
  margin-inline: auto;
}

.diagram-nav {
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.diagram-brand,
.diagram-nav__links a {
  text-decoration: none;
}

.diagram-brand {
  display: inline-flex;
  align-items: baseline;
  gap: .7rem;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  letter-spacing: .15em;
}

.diagram-brand small {
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.diagram-nav__links {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  color: var(--ink-soft);
  font-size: .82rem;
}

.diagram-nav__links a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--vermillion);
  text-underline-offset: .45rem;
}

.diagram-nav a:focus-visible {
  outline: 2px solid #385f54;
  outline-offset: 3px;
}

.diagram-main {
  padding-block: clamp(2.6rem, 5vw, 4.6rem) 5rem;
}

.diagram-intro {
  max-width: 74rem;
}

.diagram-eyebrow,
.entrance-node > span,
.function-root-node > span {
  color: #74837b;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.diagram-eyebrow {
  margin: 0 0 .7rem;
}

.diagram-intro h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.7rem, 5vw, 5rem);
  font-weight: 400;
  letter-spacing: .04em;
  line-height: 1.08;
}

.diagram-summary {
  max-width: 68rem;
  margin: 1rem 0 0;
  color: var(--ink-soft);
  font-family: var(--font-serif);
  font-size: clamp(.96rem, 1.2vw, 1.12rem);
  line-height: 1.8;
}

.diagram-statline {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem 0;
  margin-top: 1.2rem;
}

.meta-pill {
  display: inline-flex;
  padding-inline: .8rem;
  border-left: 1px solid var(--line-strong);
  color: #53635b;
  font-family: ui-monospace, Consolas, monospace;
  font-size: .66rem;
}

.diagram-statline .meta-pill:first-child {
  padding-left: 0;
  border-left: 0;
}

.diagram-board,
#module-root {
  margin-top: 2.25rem;
}

.diagram-reading-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem .75rem;
  padding: .72rem .9rem;
  border-block: 1px solid var(--line);
  color: #526259;
  font-size: .72rem;
}

.diagram-reading-note > span {
  color: var(--vermillion);
}

.diagram-reading-note strong {
  font-family: var(--font-serif);
  font-size: .88rem;
  font-weight: 500;
}

.diagram-reading-note i {
  color: #7d8c84;
  font-style: normal;
}

/* 功能树节点底板；系统架构图在独立样式表中维护。 */
.entrance-node,
.domain-node,
.module-node,
.function-root-node {
  border: 1px solid var(--line-strong);
  background: rgb(252 251 247 / 88%);
}

/* 功能模块图 */
.functional-page {
  --functional-copy-gap: 1rem;
  --functional-rule-inset: 2rem;
  --section-label-gap: .7rem;
  --connector-color: #687c72;
  --connector-stroke: 1px solid var(--connector-color);
  --function-card-background:
    radial-gradient(circle at 14% 18%, rgb(190 203 185 / 24%), transparent 54%),
    linear-gradient(100deg, #d5d8c7 0%, #dfe0d1 31%, #ebe9dd 61.8%, #f2f0e7 100%);
  --function-card-border: rgb(84 99 91 / 30%);
}

.functional-page pj-paper-atmosphere {
  transform: translate3d(0, var(--paper-drift, 0), 0);
  will-change: transform;
}

.functional-page .diagram-main,
.functional-page .diagram-footer {
  width: min(100% - 3rem, 64rem);
}

.functional-page .diagram-main {
  padding-bottom: 2.5rem;
}

.functional-page .diagram-footer {
  margin-top: .75rem;
  padding-top: .8rem;
}

.functional-page .diagram-intro {
  max-width: none;
  text-align: center;
}

.functional-page .diagram-summary {
  margin-top: var(--functional-copy-gap);
  margin-inline: auto;
}

.functional-page .diagram-statline,
.functional-page .diagram-reading-note {
  justify-content: center;
  text-align: center;
}

.functional-page .diagram-statline {
  margin-top: var(--functional-copy-gap);
}

.functional-page #module-root,
.functional-page .diagram-vertical-flow {
  margin-top: var(--functional-copy-gap);
}

.functional-page .diagram-reading-note {
  width: min(100%, 30rem);
  margin-inline: auto;
  padding: .65rem .9rem;
  border-block: 1px solid var(--line);
}

.diagram-vertical-flow {
  margin-top: 1rem;
}

.flow-cue {
  width: max-content;
  margin: 0 auto .45rem;
  padding: .28rem .55rem;
  border: 1px solid var(--line);
  color: #617068;
  background: rgb(250 248 242 / 82%);
  font-size: .62rem;
}

.function-canvas {
  min-width: 0;
  border: 1px solid var(--line-strong);
  background: rgb(253 252 248 / 68%);
}

.function-mobile-canvas {
  display: none;
}

.function-tree {
  --root-tier-gap: 1.4rem;
  padding: 1.4rem;
}

.function-root-node {
  width: min(100%, 18rem);
  margin-inline: auto;
  padding: 1rem 1.15rem;
  text-align: center;
}

.function-root-node h2 {
  margin: .32rem 0 0;
  font-family: var(--font-serif);
  font-size: 1.38rem;
  font-weight: 500;
}

.function-root-node p {
  margin: .42rem 0 0;
  color: var(--ink-soft);
  font-family: ui-monospace, Consolas, monospace;
  font-size: .58rem;
}

.branch-bracket {
  position: relative;
  width: 1px;
  height: 2.2rem;
  margin-inline: auto;
}

.branch-bracket > span {
  position: absolute;
  top: 0;
  bottom: -.3rem;
  left: 0;
  border-left: var(--connector-stroke);
}

.entrance-branches {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.15rem;
  align-items: start;
}

.entrance-branch {
  position: relative;
  padding: 1rem .7rem 1.15rem;
  border: 1px solid var(--function-card-border);
  background: rgb(252 251 247 / 42%);
}

.entrance-branch::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 0;
  height: calc(1rem + .67px);
  border-left: var(--connector-stroke);
  transform: translateX(-50%);
}

.entrance-node {
  position: relative;
  z-index: 1;
  width: min(100%, 14rem);
  margin-inline: auto;
  padding: .88rem 1rem;
  text-align: center;
}

.entrance-node::before,
.domain-node::before,
.module-node::after {
  content: "";
  position: absolute;
  z-index: 2;
  box-sizing: border-box;
  top: -9.66px;
  left: 50%;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-right: var(--connector-stroke);
  border-bottom: var(--connector-stroke);
  transform: rotate(45deg);
}

.entrance-node h2 {
  margin: .3rem 0 0;
  font-family: var(--font-serif);
  font-size: 1.18rem;
  font-weight: 500;
}

.entrance-node p {
  margin: .4rem 0 0;
  overflow-wrap: anywhere;
  color: var(--ink-soft);
  font-family: ui-monospace, Consolas, monospace;
  font-size: .53rem;
  line-height: 1.45;
}

.domain-rows {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.65rem;
  padding: .3rem .2rem .35rem;
}

.domain-row {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  min-width: 0;
}

.domain-node {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  width: min(100%, 16rem);
  min-height: 3.7rem;
  margin-inline: auto;
  padding: .72rem .85rem;
  text-align: center;
}

.domain-node span {
  color: var(--vermillion);
  font-family: ui-monospace, Consolas, monospace;
  font-size: .5rem;
}

.domain-node h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: .86rem;
  font-weight: 500;
}

.module-branch {
  --module-gap: .65rem;
  --branch-height: 1.95rem;
  --branch-midpoint: calc(var(--branch-height) / 2);
  position: relative;
  display: grid;
  gap: var(--module-gap);
  min-width: 0;
  height: var(--branch-height);
}

.root-branch {
  --module-gap: 1.15rem;
  --branch-height: calc(var(--root-tier-gap) * 2);
  --branch-midpoint: var(--root-tier-gap);
}

.root-branch i::after,
.root-branch::after {
  display: none;
}

.module-branch--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.module-branch--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.module-branch--2::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 0;
  height: var(--branch-midpoint);
  border-left: var(--connector-stroke);
  transform: translateX(-50%);
}

.module-branch > span {
  position: relative;
  min-width: 0;
}

.module-branch > span::after {
  content: "";
  position: absolute;
  top: var(--branch-midpoint);
  height: 0;
  border-top: var(--connector-stroke);
}

.module-branch > span:first-child::after {
  right: calc(var(--module-gap) / -2);
  left: 50%;
}

.module-branch > span:last-child::after {
  right: 50%;
  left: calc(var(--module-gap) / -2);
}

.module-branch--3 > span:nth-child(2)::after {
  right: calc(var(--module-gap) / -2);
  left: calc(var(--module-gap) / -2);
}

.module-branch i {
  position: absolute;
  top: var(--branch-midpoint);
  bottom: 0;
  left: 50%;
  width: 0;
  border-left: var(--connector-stroke);
  transform: translateX(-50%);
}

.module-branch--3 > span:nth-child(2) i {
  top: 0;
}

.module-branch i::after {
  display: none;
}

.module-nodes {
  --module-gap: .65rem;
  position: relative;
  display: grid;
  gap: var(--module-gap);
  min-width: 0;
}

.module-nodes--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.module-nodes--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.domain-row:not(:last-child) .module-nodes::after {
  content: "";
  position: absolute;
  z-index: 0;
  top: -1.95rem;
  bottom: -1.65rem;
  left: 50%;
  width: 0;
  border-left: var(--connector-stroke);
  transform: translateX(-50%);
}

.module-node {
  position: relative;
  z-index: 1;
  min-width: 0;
  min-height: 4.15rem;
  padding: .75rem .8rem;
  text-align: center;
}

.function-root-node,
.entrance-node,
.domain-node,
.module-node {
  border: 1px solid var(--function-card-border);
  background: var(--function-card-background);
}

.module-node h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: .86rem;
  font-weight: 500;
}

.module-node p {
  margin: .34rem 0 0;
  color: var(--ink-soft);
  font-size: .6rem;
  line-height: 1.45;
}

.ownership-index,
.principle-section {
  margin-top: 2.5rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line-strong);
}

.ownership-index > header {
  display: grid;
  grid-template-columns: max-content minmax(18rem, 1fr);
  gap: .2rem 2rem;
  align-items: end;
}

.ownership-index > header .diagram-eyebrow {
  grid-column: 1;
}

.ownership-index > header h2 {
  grid-column: 1;
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.45rem, 2.5vw, 2.2rem);
  font-weight: 400;
  white-space: nowrap;
}

.ownership-index > header > p:last-child {
  grid-column: 2;
  grid-row: 1 / span 2;
  margin: 0;
  color: var(--ink-soft);
  font-size: .72rem;
  line-height: 1.65;
}

.ownership-table {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .55rem;
  margin-top: 1rem;
  background: transparent;
}

.functional-page .ownership-table {
  background: transparent;
}

.ownership-row {
  min-width: 0;
  padding: .62rem .7rem;
  border: 1px solid var(--function-card-border, var(--line));
  background: var(--function-card-background, rgb(249 248 243 / 94%));
}

.ownership-row span,
.ownership-row strong {
  display: block;
}

.ownership-row span {
  font-family: var(--font-serif);
  font-size: .7rem;
}

.ownership-row strong {
  margin-top: .25rem;
  overflow-wrap: anywhere;
  color: #50675c;
  font-family: ui-monospace, Consolas, monospace;
  font-size: .52rem;
  font-weight: 500;
}

.functional-page .ownership-index > header {
  grid-template-columns: 1fr;
  gap: .8rem;
  text-align: center;
}

.functional-page .ownership-index,
.functional-page .principle-section {
  position: relative;
  border-top: 0;
}

.functional-page .ownership-index {
  padding-top: var(--section-label-gap);
}

.functional-page .ownership-index::before,
.functional-page .principle-section::before {
  content: "";
  position: absolute;
  top: 0;
  right: var(--functional-rule-inset);
  left: var(--functional-rule-inset);
  border-top: 1px solid var(--line-strong);
}

.functional-page .ownership-index > header .diagram-eyebrow {
  box-sizing: border-box;
  width: calc(100% - (var(--functional-rule-inset) * 2));
  margin: 0 auto;
  padding-bottom: var(--section-label-gap);
  border-bottom: 1px solid var(--line-strong);
}

.functional-page .ownership-index > header .diagram-eyebrow,
.functional-page .ownership-index > header h2,
.functional-page .ownership-index > header > p:last-child {
  grid-column: 1;
  grid-row: auto;
}

.functional-page .ownership-row {
  text-align: center;
}

.functional-page .principle-section {
  margin-top: 1.5rem;
  padding-top: var(--section-label-gap);
  text-align: center;
}

.functional-page .principle-section .diagram-eyebrow {
  margin-bottom: var(--section-label-gap);
}

.principle-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: principle;
}

.functional-page .principle-list {
  box-sizing: border-box;
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--functional-rule-inset);
}

.principle-list li {
  position: relative;
  padding: .8rem .8rem .8rem 2.4rem;
  border-top: 1px solid var(--line);
  color: #53625b;
  font-family: var(--font-serif);
  font-size: .8rem;
  line-height: 1.6;
  counter-increment: principle;
}

.principle-list li::before {
  content: counter(principle, decimal-leading-zero);
  position: absolute;
  top: .85rem;
  left: 0;
  color: var(--vermillion);
  font-family: ui-monospace, Consolas, monospace;
  font-size: .62rem;
}

.functional-page .principle-list li {
  padding-inline: 1.2rem;
  text-align: center;
}

.functional-page .principle-list li::before {
  position: static;
  display: block;
  margin-bottom: .35rem;
}

.diagram-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  margin-top: 1rem;
  padding-block: 2rem 3rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: .68rem;
}

.diagram-footer p,
.no-script {
  margin: 0;
}

.no-script {
  margin-top: 2rem;
  padding: 1rem;
  border: 1px solid var(--line-strong);
  background: var(--paper-light);
}

@media (max-width: 980px) {
  .diagram-nav,
  .diagram-main,
  .diagram-footer {
    width: min(100% - 2rem, 96rem);
  }

  .ownership-table {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ownership-index > header {
    grid-template-columns: 1fr;
    gap: .35rem;
  }

  .ownership-index > header .diagram-eyebrow,
  .ownership-index > header h2,
  .ownership-index > header > p:last-child {
    grid-column: 1;
    grid-row: auto;
  }
}

@media (max-width: 760px) {
  .diagram-nav,
  .diagram-main,
  .diagram-footer {
    width: min(100% - 1.5rem, 96rem);
  }

  .functional-page .diagram-main,
  .functional-page .diagram-footer {
    width: min(100% - 1.5rem, 64rem);
  }

  .functional-page {
    --functional-rule-inset: .8rem;
  }

  .functional-page .diagram-reading-note {
    width: min(calc(100% - 1.6rem - 1px), 30rem);
  }

  .diagram-nav {
    min-height: 4.5rem;
  }

  .diagram-brand {
    font-size: 1.04rem;
  }

  .diagram-brand small {
    display: none;
  }

  .diagram-nav__links {
    gap: .8rem;
    font-size: .72rem;
  }

  .diagram-main {
    padding-top: 2.5rem;
  }

  .diagram-intro h1 {
    font-size: 2.55rem;
  }

  /*
   * 功能图窄屏使用独立的线性树结构；桌面扇出树不参与窄屏排版，
   * 避免通过层层覆盖把桌面容器压成“卡片套卡片”。
   */
  .functional-page .function-canvas {
    display: none;
  }

  .functional-page .function-mobile-canvas {
    display: block;
  }

  .function-mobile-tree {
    padding: .8rem 0;
  }

  .function-mobile-tree .function-root-node {
    width: min(100%, 18rem);
  }

  .functional-mobile-entrances,
  .functional-mobile-domains,
  .functional-mobile-domain,
  .functional-mobile-entrance {
    display: grid;
    justify-items: center;
    width: 100%;
    min-width: 0;
  }

  .functional-mobile-entrance .entrance-node {
    width: min(100%, 18rem);
  }

  .functional-mobile-domain .domain-node {
    width: min(100%, 16rem);
  }

  .functional-mobile-module-group {
    display: grid;
    grid-template-columns: 1fr;
    gap: .7rem;
    width: min(100%, 20rem);
    padding: .7rem;
    border: 1px solid rgb(84 99 91 / 18%);
    background: rgb(251 250 246 / 6%);
  }

  .functional-mobile-module-group .module-node {
    width: 100%;
  }

  .functional-mobile-connector {
    position: relative;
    width: 0;
    height: 1.45rem;
    margin-inline: auto;
    border-left: var(--connector-stroke);
  }

  .functional-mobile-connector::after {
    content: "";
    position: absolute;
    right: auto;
    bottom: 1px;
    left: 50%;
    width: 6px;
    height: 6px;
    margin-left: -3px;
    border-right: var(--connector-stroke);
    border-bottom: var(--connector-stroke);
    transform: rotate(45deg);
  }

  .functional-mobile-entrance + .functional-mobile-entrance {
    margin-top: 2rem;
  }

  .function-mobile-tree .entrance-node::before,
  .function-mobile-tree .domain-node::before,
  .function-mobile-tree .module-node::before,
  .function-mobile-tree .module-node::after {
    display: none;
  }

  .ownership-index > header {
    grid-template-columns: 1fr;
    gap: .35rem;
  }

  .ownership-index > header .diagram-eyebrow,
  .ownership-index > header h2,
  .ownership-index > header > p:last-child {
    grid-column: 1;
    grid-row: auto;
  }

  .principle-list {
    grid-template-columns: 1fr;
  }

  .diagram-footer {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .diagram-nav__links a:last-child {
    display: none;
  }

  .diagram-intro h1 {
    font-size: 2.2rem;
  }

  .diagram-summary {
    font-size: .9rem;
  }

  .ownership-table {
    grid-template-columns: 1fr;
  }

  .functional-page .ownership-table {
    width: 61.8%;
    margin-inline: auto;
  }
}

@media print {
  .diagram-nav__links {
    display: none;
  }

  .function-canvas {
    min-width: 0;
  }
}