.page-about {
  --about-tint-3: #8DC4DA;
  --about-tint-4: #BCDCE9;
  --about-rule: 1px solid rgba(16, 32, 44, .14);
  display: block;
  overflow-x: clip;
}

.page-about .container {
  width: 100%;
  max-width: var(--page);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--c-num);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(32px, 6vw, 72px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 18px;
}

.page-about .about-hero__crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mute);
}

.page-about .about-hero__crumb .breadcrumb__item {
  color: inherit;
  text-decoration: none;
}

.page-about .about-hero__crumb a.breadcrumb__item:hover,
.page-about .about-hero__crumb a.breadcrumb__item:focus-visible {
  color: var(--c-dawn);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-mute);
}

.page-about .about-hero__eyebrow .num {
  font-size: 15px;
  color: var(--c-dawn);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--c-ink);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 66ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
}

.page-about .about-hero__figure {
  margin: clamp(26px, 5vw, 52px) 0 0;
}

.page-about .figure-frame__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  position: relative;
  display: grid;
  gap: 10px;
  margin-bottom: clamp(30px, 5vw, 56px);
  padding-bottom: 16px;
  border-bottom: var(--about-rule);
}

.page-about .about-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 86px;
  height: 3px;
  background: linear-gradient(90deg, var(--c-dawn), var(--c-ember));
}

.page-about .about-head .section__num {
  margin: 0;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--c-dawn);
}

.page-about .about-head .section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--c-ink);
}

.page-about .about-head .section__sub {
  margin: 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-mute);
}

.page-about .about-head--ink .section__title {
  color: var(--c-cloud);
}

.page-about .about-head--ink .section__sub {
  color: rgba(255, 255, 255, .62);
}

.page-about .about-head--ink {
  border-bottom-color: rgba(255, 255, 255, .2);
}

.page-about .about-head--ink .section__num {
  color: var(--c-ember);
}

/* ---------- 01 身份 ---------- */
.page-about .about-identity__body {
  display: grid;
  gap: 20px;
  max-width: 74ch;
}

.page-about .about-identity__body p {
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
}

.page-about .about-identity__body .about-lead {
  font-size: clamp(18px, 2.2vw, 21px);
  line-height: 1.62;
  color: var(--c-ink);
  font-weight: 600;
  padding-left: 20px;
  border-left: 3px solid var(--c-dawn);
}

/* ---------- 02 版本时间线 ---------- */
.page-about .about-versions__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  grid-template-columns: 1fr;
}

.page-about .about-track {
  position: relative;
  display: grid;
  gap: 0;
  padding-left: 30px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-dawn), var(--c-mid) 55%, var(--c-ember-soft));
}

.page-about .about-node {
  position: relative;
  display: grid;
  gap: 2px;
  width: 100%;
  padding: 14px 12px 14px 4px;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: var(--c-text);
  transition: color 160ms var(--ease);
}

.page-about .about-node__dot {
  position: absolute;
  left: -28px;
  top: 20px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  border: 2px solid var(--c-dawn);
  background: var(--c-cloud);
  transition: background 160ms var(--ease), box-shadow 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-node__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-dawn);
}

.page-about .about-node__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -.01em;
}

.page-about .about-node[aria-selected="true"] .about-node__dot {
  background: var(--c-ember);
  border-color: var(--c-line);
  box-shadow: 0 0 0 4px var(--c-ember-soft);
}

.page-about .about-node[aria-selected="true"] .about-node__name {
  color: var(--c-ink);
}

.page-about .about-node:hover .about-node__name,
.page-about .about-node:focus-visible .about-node__name {
  color: var(--c-dawn);
}

.page-about .about-node:focus-visible {
  outline: 2px solid var(--c-ember);
  outline-offset: 2px;
}

.page-about .about-versions__panels {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-panel {
  padding: clamp(20px, 3vw, 32px);
  background: var(--c-cloud);
  border: var(--edge);
  box-shadow: var(--lift);
}

.page-about .about-panel[hidden] {
  display: none;
}

.page-about .about-panel__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.1rem, 2.4vw, 1.45rem);
  letter-spacing: -.02em;
  color: var(--c-ink);
}

.page-about .about-panel p {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
}

.page-about .about-panel__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

.page-about .about-panel__meta .tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-num);
  background: var(--c-mist);
  border: 1px solid rgba(27, 127, 168, .3);
}

.page-about .about-versions__figure {
  margin: clamp(32px, 5vw, 56px) 0 0;
}

/* ---------- 03 两班节奏 ---------- */
.page-about .about-rhythm__grid {
  display: grid;
  gap: clamp(26px, 4.5vw, 48px);
  grid-template-columns: 1fr;
}

.page-about .about-rhythm__figure {
  margin: 0;
}

.page-about .about-rhythm__body {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .about-team {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__item {
  display: grid;
  gap: 2px;
  padding: 14px 12px;
  background: var(--c-cloud);
  border: var(--edge);
  box-shadow: var(--lift-sm);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  color: var(--c-dawn);
}

.page-about .about-team__label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mute);
}

.page-about .about-rhythm__intro {
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
  max-width: 68ch;
}

.page-about .about-flow__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-bottom: 18px;
  border-bottom: var(--about-rule);
}

.page-about .about-flow__tab {
  appearance: none;
  padding: 10px 18px;
  border: 0;
  background: none;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-mute);
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-flow__tab[aria-selected="true"] {
  color: var(--c-ink);
  border-bottom-color: var(--c-ember);
}

.page-about .about-flow__tab:focus-visible {
  outline: 2px solid var(--c-ember);
  outline-offset: 2px;
}

.page-about .about-flow__panel[hidden] {
  display: none;
}

.page-about .about-flow__steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-flow;
}

.page-about .about-flow__step {
  position: relative;
  padding: 12px 16px 12px 48px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-cloud);
  border-left: 3px solid var(--c-mid);
  counter-increment: about-flow;
}

.page-about .about-flow__step::before {
  content: counter(about-flow, decimal-leading-zero);
  position: absolute;
  left: 14px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--c-dawn);
}

/* ---------- 04 覆盖范围 ---------- */
.page-about .about-reach__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  grid-template-columns: 1fr;
}

.page-about .about-reach__stats {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--about-rule);
}

.page-about .about-stat {
  display: grid;
  gap: 4px;
  padding: 20px 16px 20px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1;
  color: var(--c-dawn);
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mute);
}

.page-about .about-reach__dist-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--c-ink);
}

.page-about .reach-dist {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .reach-dist__row {
  display: grid;
  gap: 12px;
  grid-template-columns: 5.5em minmax(0, 1fr);
  align-items: center;
}

.page-about .reach-dist__name {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-mute);
}

.page-about .reach-dist__bar {
  display: block;
  height: 20px;
  border: 2px solid var(--c-line);
}

.page-about .reach-dist__bar--1 {
  background: var(--c-dawn);
  width: 100%;
}

.page-about .reach-dist__bar--2 {
  background: var(--c-mid);
  width: 64%;
}

.page-about .reach-dist__bar--3 {
  background: var(--about-tint-3);
  width: 42%;
}

.page-about .reach-dist__bar--4 {
  background: var(--about-tint-4);
  width: 26%;
}

.page-about .reach-dist__bar--5 {
  background: var(--c-mist);
  width: 15%;
}

.page-about .about-reach__dist-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mute);
}

.page-about .about-reach__tail {
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding-top: 20px;
  border-top: var(--about-rule);
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
  max-width: 74ch;
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-tree {
  display: grid;
  gap: 26px;
}

.page-about .about-tree__root {
  justify-self: start;
  margin: 0;
  padding: 10px 22px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--c-ink);
  background: var(--c-ember);
  border: 2px solid var(--c-line);
  box-shadow: var(--lift-sm);
}

.page-about .about-tree__branches {
  position: relative;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-tree__branches::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: rgba(255, 255, 255, .22);
}

.page-about .about-tree__branch {
  position: relative;
  padding: 18px 20px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .18);
  transition: border-color 220ms var(--ease), background 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-tree__branch::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 30px;
  width: 23px;
  height: 2px;
  background: rgba(255, 255, 255, .22);
}

.page-about .about-tree__branch:hover,
.page-about .about-tree__branch:focus-within {
  border-color: var(--c-ember);
  background: rgba(255, 122, 61, .08);
  transform: translateX(3px);
}

.page-about .about-tree__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--c-cloud);
}

.page-about .about-tree__title .num {
  color: var(--c-ember);
}

.page-about .about-tree__desc {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-tree__more {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 260ms var(--ease);
}

.page-about .about-tree__more > p {
  overflow: hidden;
  min-height: 0;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .62);
}

.page-about .about-tree__branch:hover .about-tree__more,
.page-about .about-tree__branch:focus-within .about-tree__more {
  grid-template-rows: 1fr;
}

.page-about .about-tree__branch:hover .about-tree__more > p,
.page-about .about-tree__branch:focus-within .about-tree__more > p {
  padding-top: 10px;
}

/* ---------- 06 三件事 ---------- */
.page-about .about-principles__list {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-principle {
  display: grid;
  gap: 10px;
  padding-top: 20px;
  border-top: 3px solid var(--c-line);
}

.page-about .about-principle__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-ember);
}

.page-about .about-principle__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.2rem, 2.8vw, 1.7rem);
  letter-spacing: -.02em;
  color: var(--c-ink);
}

.page-about .about-principle__text {
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
}

/* ---------- 07 继续了解 ---------- */
.page-about .about-next__links {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .about-next__link {
  display: grid;
  gap: 4px;
  padding: 20px 4px;
  border-bottom: var(--about-rule);
  text-decoration: none;
  color: inherit;
  transition: background 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--c-cloud);
  padding-left: 16px;
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--c-ember);
  outline-offset: -2px;
}

.page-about .about-next__label {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2.6vw, 1.35rem);
  letter-spacing: -.02em;
  color: var(--c-ink);
}

.page-about .about-next__desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-mute);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-reach__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-principles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-principles__list > li:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-about .about-versions__grid {
    grid-template-columns: minmax(220px, 290px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rhythm__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-principles__list > li:first-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__dot,
  .page-about .about-node,
  .page-about .about-flow__tab,
  .page-about .about-tree__branch,
  .page-about .about-tree__more,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .about-tree__branch:hover,
  .page-about .about-tree__branch:focus-within,
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}
<<<END>>>

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