.page-about {
  background: var(--paper);
  color: var(--ink);
  --about-rule: rgba(16, 24, 32, .14);
  --about-muted: rgba(16, 24, 32, .7);
  --about-soft: rgba(16, 24, 32, .54);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--deep);
  color: var(--paper);
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg,
    var(--spring) 0 25%,
    var(--summer) 25% 50%,
    var(--autumn) 50% 75%,
    var(--winter) 75% 100%);
  opacity: .85;
}

.page-about .about-hero__crumbs {
  margin: 0 0 clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero__crumbs .breadcrumbs__item {
  color: var(--slate);
}

.page-about .about-hero__crumbs .breadcrumbs__link {
  color: var(--slate);
  text-decoration: none;
}

.page-about .about-hero__crumbs .breadcrumbs__link:hover,
.page-about .about-hero__crumbs .breadcrumbs__link:focus-visible {
  color: var(--paper);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-hero__eyebrow {
  color: var(--autumn);
  margin: 0 0 1rem;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.015em;
  margin: 0;
  max-width: 20ch;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  max-width: 56ch;
  font-family: var(--font-serif);
  font-size: var(--step-0);
  line-height: 1.9;
  color: rgba(247, 244, 236, .82);
}

.page-about .about-hero__stats {
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--line-soft);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem .9rem;
}

.page-about .about-stat {
  min-width: 0;
}

.page-about .about-stat__label {
  font-size: var(--step--1);
  line-height: 1.4;
  color: var(--slate);
  margin: 0 0 .45rem;
}

.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(1.6rem, 5.4vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--paper);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-body {
  padding: clamp(1rem, 3vw, 2rem) 0 clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-chapter {
  --accent: var(--spring);
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
  padding: clamp(2.25rem, 5vw, 3.75rem) 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-chapter:first-child {
  border-top: 0;
}

.page-about .about-chapter[data-season="spring"] { --accent: var(--spring); }
.page-about .about-chapter[data-season="summer"] { --accent: var(--summer); }
.page-about .about-chapter[data-season="autumn"] { --accent: var(--autumn); }
.page-about .about-chapter[data-season="winter"] { --accent: var(--winter); }

.page-about .about-chapter__meta {
  display: flex;
  align-items: center;
  gap: .8rem;
  min-width: 0;
}

.page-about .about-chapter__index {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--ink);
}

.page-about .about-chapter__content {
  min-width: 0;
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.6vw, 2.25rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.01em;
  margin: 0 0 1.1rem;
  color: var(--ink);
  max-width: 24ch;
}

.page-about .about-chapter__lede {
  margin: 0 0 1.5rem;
  max-width: 58ch;
  font-family: var(--font-serif);
  font-size: var(--step-0);
  line-height: 1.9;
  color: var(--about-muted);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.page-about .about-chapter__text {
  min-width: 0;
}

.page-about .about-chapter__text p {
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  font-size: var(--step-0);
  line-height: 1.9;
  color: var(--about-muted);
  max-width: 60ch;
}

.page-about .about-chapter__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__text--after {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: var(--sand);
  object-fit: cover;
}

.page-about .about-figure__caption {
  margin: .65rem 0 0;
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--about-soft);
}

.page-about .about-figure--wide {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

/* ---------- 三件日常事 ---------- */
.page-about .about-daily {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rule);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-daily__item {
  --cell: var(--spring);
  background: var(--paper);
  padding: 1.35rem 1.15rem 1.5rem;
}

.page-about .about-daily__item--spring { --cell: var(--spring); }
.page-about .about-daily__item--summer { --cell: var(--summer); }
.page-about .about-daily__item--autumn { --cell: var(--autumn); }
.page-about .about-daily__item--winter { --cell: var(--winter); }

.page-about .about-daily__item::before {
  content: "";
  display: block;
  width: 2rem;
  height: 3px;
  background: var(--cell);
  margin-bottom: .95rem;
}

.page-about .about-daily__title {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 .55rem;
  color: var(--ink);
}

.page-about .about-daily__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--about-muted);
}

/* ---------- 团队四象限 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
  margin-top: .25rem;
}

.page-about .about-team__cell {
  --cell: var(--spring);
  background: var(--paper);
  padding: 1.4rem 1.2rem 1.5rem;
  transition: background-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-team__cell--spring { --cell: var(--spring); }
.page-about .about-team__cell--summer { --cell: var(--summer); }
.page-about .about-team__cell--autumn { --cell: var(--autumn); }
.page-about .about-team__cell--winter { --cell: var(--winter); }

.page-about .about-team__cell:hover,
.page-about .about-team__cell:focus-within {
  background: rgba(255, 255, 255, .72);
  box-shadow: inset 4px 0 0 var(--cell);
}

.page-about .about-team__name {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 .5rem;
  color: var(--ink);
}

.page-about .about-team__name::after {
  content: "";
  display: block;
  width: 1.5rem;
  height: 2px;
  margin-top: .6rem;
  background: var(--cell);
}

.page-about .about-team__desc {
  margin: .7rem 0 0;
  font-family: var(--font-body);
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--about-muted);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
}

.page-about .about-versions__item {
  --accent: var(--spring);
  position: relative;
  padding: 0 0 1.6rem 1.9rem;
}

.page-about .about-versions__item:last-child {
  padding-bottom: 0;
}

.page-about .about-versions__item[data-season="spring"] { --accent: var(--spring); }
.page-about .about-versions__item[data-season="summer"] { --accent: var(--summer); }
.page-about .about-versions__item[data-season="autumn"] { --accent: var(--autumn); }
.page-about .about-versions__item[data-season="winter"] { --accent: var(--winter); }

.page-about .about-versions__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .45rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--paper);
  transition: transform .2s var(--ease);
  z-index: 1;
}

.page-about .about-versions__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1.7rem;
  bottom: 0;
  width: 1px;
  background: var(--about-rule);
}

.page-about .about-versions__item:last-child::after {
  display: none;
}

.page-about .about-versions__item:hover::before,
.page-about .about-versions__item:focus-within::before {
  transform: scale(1.25);
}

.page-about .about-versions__year {
  margin: 0 0 .3rem;
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--about-soft);
}

.page-about .about-versions__title {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 .4rem;
  color: var(--ink);
  text-decoration-color: transparent;
  text-decoration-line: underline;
  text-underline-offset: 5px;
  text-decoration-thickness: 2px;
  transition: text-decoration-color .2s var(--ease);
}

.page-about .about-versions__item:hover .about-versions__title,
.page-about .about-versions__item:focus-within .about-versions__title {
  text-decoration-color: var(--accent);
}

.page-about .about-versions__text {
  margin: 0;
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: var(--step--1);
  line-height: 1.85;
  color: var(--about-muted);
}

/* ---------- 服务区域 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
}

.page-about .about-coverage__visual {
  position: relative;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: rgba(216, 210, 196, .3);
  background-image: radial-gradient(circle, rgba(16, 24, 32, .18) 1.2px, transparent 1.3px);
  background-size: 16px 16px;
}

.page-about .about-coverage__glow {
  position: absolute;
  border-radius: 50%;
}

.page-about .about-coverage__glow--a {
  width: 34%;
  padding-bottom: 34%;
  left: 42%;
  top: 34%;
  background: radial-gradient(circle, rgba(242, 107, 58, .55), rgba(242, 107, 58, 0) 70%);
}

.page-about .about-coverage__glow--b {
  width: 62%;
  padding-bottom: 62%;
  left: 20%;
  top: 12%;
  background: radial-gradient(circle, rgba(47, 158, 110, .32), rgba(47, 158, 110, 0) 72%);
}

.page-about .about-coverage__ring {
  position: absolute;
  inset: 12%;
  border: 1px dashed rgba(44, 95, 138, .5);
  border-radius: 50%;
}

.page-about .about-coverage__stats {
  margin: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-coverage__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: .7rem 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-coverage__stat dt {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.5;
  color: var(--about-muted);
}

.page-about .about-coverage__stat dd {
  margin: 0;
  flex: none;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-coverage__stat dd .mono {
  font-family: var(--font-mono);
  letter-spacing: -.02em;
}

/* ---------- 工作原则 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-principles__item {
  padding: 0 0 1.35rem;
  margin: 0 0 1.35rem;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-principles__item:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-about .about-principles__title {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 .45rem;
  color: var(--ink);
  padding-left: .85rem;
  border-left: 3px solid var(--spring);
}

.page-about .about-principles__item:nth-child(2) .about-principles__title {
  border-left-color: var(--autumn);
}

.page-about .about-principles__item:nth-child(3) .about-principles__title {
  border-left-color: var(--winter);
}

.page-about .about-principles__text {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--step-0);
  line-height: 1.85;
  color: var(--about-muted);
  padding-left: .85rem;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--about-rule);
  padding: clamp(2rem, 5vw, 3.25rem) 0 clamp(2.5rem, 6vw, 4rem);
  background: rgba(216, 210, 196, .22);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 1.25rem;
  color: var(--ink);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-next__item {
  --cell: var(--spring);
  background: var(--paper);
}

.page-about .about-next__item--spring { --cell: var(--spring); }
.page-about .about-next__item--summer { --cell: var(--summer); }
.page-about .about-next__item--autumn { --cell: var(--autumn); }
.page-about .about-next__item--winter { --cell: var(--winter); }

.page-about .about-next__link {
  display: block;
  padding: 1.15rem 1.1rem 1.25rem;
  text-decoration: none;
  color: inherit;
  border-top: 3px solid var(--cell);
  transition: background-color .25s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(255, 255, 255, .75);
}

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

.page-about .about-next__kicker {
  display: block;
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--about-soft);
  margin-bottom: .45rem;
}

.page-about .about-next__label {
  display: block;
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-daily {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-about .about-chapter {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3.25rem);
  }

  .page-about .about-chapter__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    position: sticky;
    top: 7.5rem;
    align-self: start;
    border-left: 2px solid var(--accent);
    padding-left: 1rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-chapter__grid--with-media {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(1.75rem, 3.5vw, 2.75rem);
  }

  .page-about .about-chapter__grid--reverse {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  }

  .page-about .about-chapter__grid--reverse .about-figure {
    order: 2;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: clamp(1.5rem, 3.5vw, 2.75rem);
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__stats {
    max-width: 46rem;
  }
}
<<<END>>>