.page-about {
  --about-gap: clamp(1rem, 3vw, 1.75rem);
  --about-hair: 1px solid rgba(62, 26, 94, .18);
  --about-hair-soft: 1px solid rgba(62, 26, 94, .12);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 顶部：路径 + 开篇 ---------- */
.page-about .about-top {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
}

.page-about .crumbs {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--ink-soft);
}

.page-about .crumbs a {
  color: var(--grape-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .crumbs a:hover {
  border-bottom-color: var(--vine);
}

.page-about .about-hero {
  position: relative;
  display: grid;
  gap: var(--about-gap);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  padding-inline-start: clamp(1.75rem, 4.5vw, 3rem);
  background: var(--paper-white);
  border: var(--edge);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  width: 10px;
  background: linear-gradient(180deg, var(--grape) 0%, var(--grape-lift) 45%, var(--vine) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline-end: 0;
  width: clamp(60px, 12%, 130px);
  aspect-ratio: 1;
  background: var(--gold);
  opacity: .22;
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .about-hero__title {
  margin: .35rem 0 0;
  font-family: var(--font-title);
  font-size: clamp(1.85rem, 6vw, 3.3rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--grape-deep);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--grape);
  box-shadow: inset 0 -.18em 0 rgba(217, 179, 108, .55);
}

.page-about .about-hero__lede {
  max-width: 56ch;
  margin-top: .75rem;
  font-size: clamp(.95rem, 2vw, 1.05rem);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.25rem;
}

.page-about .about-copy {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .03em;
  padding: .68rem 1rem;
  background: transparent;
  border: 1px solid var(--grape-deep);
  color: var(--grape-deep);
  cursor: pointer;
  transition: background .2s ease, color .2s ease;
}

.page-about .about-copy:hover,
.page-about .about-copy:focus-visible {
  background: var(--grape-deep);
  color: var(--paper-white);
}

.page-about .about-copy.is-done {
  border-color: var(--vine);
  color: var(--vine);
}

.page-about .about-hero__side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .55rem;
  padding-top: 1rem;
  border-top: var(--about-hair);
}

.page-about .about-hero__side .sticker {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .06em;
}

.page-about .about-hero__sticker-note {
  margin: 0;
  font-size: .74rem;
  font-family: var(--font-mono);
  color: var(--ink-soft);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .55rem .9rem;
  width: 100%;
  margin: .35rem 0 0;
}

.page-about .about-facts > div {
  padding-top: .45rem;
  border-top: var(--about-hair-soft);
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--ink-soft);
}

.page-about .about-facts dd {
  margin: .1rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 3vw, 1.55rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--grape-deep);
}

@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.6fr) minmax(230px, .8fr);
    align-items: start;
  }

  .page-about .about-hero__side {
    padding-top: 0;
    padding-inline-start: clamp(1rem, 2vw, 1.6rem);
    border-top: 0;
    border-inline-start: var(--about-hair);
  }
}

/* ---------- 双栏：目录 + 章节 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: clamp(2rem, 5vw, 3.25rem);
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: .55rem;
}

.page-about .about-rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .rail-nav {
  display: flex;
  gap: .35rem;
  overflow-x: auto;
  padding: .5rem;
  background: var(--paper-white);
  border: var(--about-hair);
  -webkit-overflow-scrolling: touch;
}

.page-about .rail-nav a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem .7rem;
  font-size: .84rem;
  white-space: nowrap;
  text-decoration: none;
  color: var(--grape-deep);
  border: 1px solid transparent;
  transition: border-color .2s ease, background .2s ease;
}

.page-about .rail-nav a:hover {
  border-color: var(--vine);
  background: rgba(46, 139, 109, .08);
}

.page-about .rail-nav__no {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--grape);
}

.page-about .about-rail__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--ink-soft);
}

.page-about .about-rail__foot .tool-btn {
  font-family: var(--font-mono);
  font-size: .72rem;
  background: transparent;
  border: 1px solid rgba(62, 26, 94, .3);
  color: var(--grape-deep);
  padding: .3rem .6rem;
  cursor: pointer;
  transition: border-color .2s ease, color .2s ease;
}

.page-about .about-rail__foot .tool-btn:hover {
  border-color: var(--vine);
  color: var(--vine);
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: minmax(190px, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .rail-nav {
    flex-direction: column;
    overflow: visible;
    padding: .45rem;
  }

  .page-about .rail-nav a {
    white-space: normal;
    border: 0;
    border-inline-start: 2px solid transparent;
    padding: .45rem .6rem;
  }

  .page-about .rail-nav a:hover {
    border-inline-start-color: var(--grape);
    background: rgba(107, 47, 160, .07);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .ch {
  padding-top: clamp(1.5rem, 4vw, 2.25rem);
  border-top: var(--about-hair);
}

.page-about .ch + .ch {
  margin-top: clamp(2.25rem, 5vw, 3.5rem);
}

.page-about .ch__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(.75rem, 2vw, 1.5rem);
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
}

.page-about .ch__head .section-no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 8vw, 4.5rem);
  line-height: .82;
  color: transparent;
  -webkit-text-stroke: 2px var(--grape-deep);
}

.page-about .ch__intro h2 {
  margin: 0 0 .35rem;
  font-family: var(--font-title);
  font-size: clamp(1.28rem, 3.6vw, 1.9rem);
  line-height: 1.28;
  color: var(--grape-deep);
}

.page-about .ch__sub {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .prose {
  font-size: .98rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .prose p {
  margin: 0 0 .9rem;
}

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

.page-about .ch__split {
  display: grid;
  gap: clamp(1rem, 3vw, 1.75rem);
}

@media (min-width: 820px) {
  .page-about .ch__split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .ch__split--rev {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  }
}

/* ---------- 图片框 ---------- */
.page-about .about-fig {
  margin: 0;
  padding: .5rem;
  background: var(--paper-white);
  border: var(--about-hair);
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-fig .media-frame__caption {
  padding: .5rem .25rem 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

@media (min-width: 820px) {
  .page-about .about-fig img {
    aspect-ratio: 3 / 2;
  }
}

.page-about .hand-note {
  max-width: 46ch;
  margin: 1.1rem 0 0;
  padding: .7rem 1rem;
  font-family: var(--font-title);
  font-style: italic;
  font-size: .93rem;
  line-height: 1.7;
  color: var(--grape-deep);
  background: rgba(217, 179, 108, .18);
  border-inline-start: 3px solid var(--gold);
  transform: rotate(-.4deg);
}

/* ---------- 02 四个位置 ---------- */
.page-about .method-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
}

@media (min-width: 640px) {
  .page-about .method-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .method-card {
  padding: 1.1rem 1.1rem 1.2rem;
  background: var(--paper-white);
  border: var(--about-hair);
  border-top: 3px solid var(--grape);
  box-shadow: var(--shadow-card);
  transition: border-top-color .2s ease, transform .2s ease;
}

.page-about .method-card:hover {
  border-top-color: var(--vine);
  transform: translateY(-2px);
}

.page-about .method-card__key {
  margin: 0 0 .35rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--grape);
}

.page-about .method-card h3 {
  margin: 0 0 .45rem;
  font-family: var(--font-title);
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--grape-deep);
}

.page-about .method-card p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .method-card .link-arrow {
  color: var(--vine);
  font-size: .85rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 139, 109, .5);
}

.page-about .method-card .link-arrow:hover {
  border-bottom-color: var(--grape);
  color: var(--grape);
}

.page-about .proof {
  margin-top: clamp(1.25rem, 3vw, 2rem);
  padding: clamp(1rem, 3vw, 1.5rem);
  background: rgba(46, 139, 109, .08);
  border: 1px solid rgba(46, 139, 109, .3);
}

.page-about .proof h3 {
  margin: 0;
  font-family: var(--font-title);
  font-size: 1.05rem;
  color: var(--grape-deep);
}

.page-about .proof__steps {
  list-style: none;
  counter-reset: pstep;
  margin: .8rem 0 0;
  padding: 0;
  display: grid;
  gap: .6rem;
}

.page-about .proof__steps li {
  position: relative;
  padding-inline-start: 2rem;
  font-size: .86rem;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .proof__steps li::before {
  counter-increment: pstep;
  content: counter(pstep);
  position: absolute;
  inset-inline-start: 0;
  top: .1rem;
  width: 1.3rem;
  height: 1.3rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--paper-white);
  background: var(--vine);
  border-radius: 50%;
}

.page-about .proof__steps span {
  display: block;
  font-weight: 700;
  color: var(--grape-deep);
}

.page-about .proof > p {
  margin: .85rem 0 0;
  font-family: var(--font-title);
  font-style: italic;
  font-size: .88rem;
  color: var(--grape-deep);
}

/* ---------- 03 团队 ---------- */
.page-about .crew {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

@media (min-width: 640px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .crew li {
  padding: .8rem 1rem;
  background: var(--paper-white);
  border: var(--about-hair);
  border-inline-start: 3px solid var(--vine);
}

.page-about .crew strong {
  display: block;
  font-size: .92rem;
  color: var(--grape-deep);
}

.page-about .crew p {
  margin: .3rem 0 0;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(62, 26, 94, .16);
  border: 1px solid rgba(62, 26, 94, .16);
}

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

.page-about .about-stats li {
  background: var(--paper-white);
  padding: .85rem 1rem;
}

.page-about .about-stats b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.65rem);
  line-height: 1.1;
  color: var(--grape);
}

.page-about .about-stats span {
  font-size: .76rem;
  line-height: 1.5;
  color: var(--ink-soft);
}

/* ---------- 04 深色里程碑 ---------- */
.page-about .ch--dark {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 0;
  background: var(--grape-deep);
  color: var(--paper);
}

.page-about .ch--dark .ch__head .section-no {
  -webkit-text-stroke-color: var(--gold);
}

.page-about .ch--dark .ch__intro h2 {
  color: var(--paper-white);
}

.page-about .ch--dark .ch__sub {
  color: rgba(245, 240, 230, .74);
}

.page-about .ch--dark .about-fig {
  background: rgba(255, 253, 247, .07);
  border-color: rgba(245, 240, 230, .22);
}

.page-about .ch--dark .about-fig .media-frame__caption {
  color: rgba(245, 240, 230, .66);
}

.page-about .tl-vine {
  display: none;
  position: absolute;
  inset-block: 14%;
  inset-inline-end: -6px;
  width: 64px;
  height: 72%;
  color: var(--gold);
  opacity: .18;
  pointer-events: none;
}

@media (min-width: 820px) {
  .page-about .tl-vine {
    display: block;
  }
}

.page-about .tl {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .tl__item {
  position: relative;
  padding-inline-start: 1.7rem;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  inset-inline-start: 5px;
  top: 1.6rem;
  bottom: -1.1rem;
  width: 1px;
  background: rgba(217, 179, 108, .4);
}

.page-about .tl__item:last-child::before {
  display: none;
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: .5rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(217, 179, 108, .18);
}

.page-about .tl__year {
  display: inline-block;
  margin-bottom: .45rem;
  padding: .1rem .45rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--gold);
  border: 1px solid rgba(217, 179, 108, .5);
}

.page-about .tl__card h3 {
  margin: 0 0 .3rem;
  font-family: var(--font-title);
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--paper-white);
}

.page-about .tl__card > p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.75;
  color: rgba(245, 240, 230, .8);
}

.page-about .tl__more {
  margin-top: .5rem;
}

.page-about .tl__more summary {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--vine-mist);
}

.page-about .tl__more summary::-webkit-details-marker {
  display: none;
}

.page-about .tl__more summary::before {
  content: "＋";
  font-size: .85rem;
}

.page-about .tl__more[open] summary::before {
  content: "－";
}

.page-about .tl__more summary:hover {
  color: var(--paper-white);
}

.page-about .tl__more p {
  margin: .45rem 0 0;
  padding-inline-start: .8rem;
  font-size: .82rem;
  line-height: 1.75;
  color: rgba(245, 240, 230, .72);
  border-inline-start: 1px solid rgba(217, 179, 108, .45);
}

.page-about .dark-note {
  position: relative;
  z-index: 1;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding-top: .9rem;
  border-top: 1px solid rgba(217, 179, 108, .3);
  font-size: .84rem;
  line-height: 1.75;
  color: rgba(245, 240, 230, .78);
}

/* ---------- 05 服务范围 ---------- */
.page-about .ch--vine {
  padding: clamp(1.25rem, 4vw, 2.25rem);
  background: linear-gradient(160deg, rgba(46, 139, 109, .1), rgba(143, 201, 181, .26));
  border: 1px solid rgba(46, 139, 109, .32);
}

.page-about .who {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
}

@media (min-width: 720px) {
  .page-about .who {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .who__card {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1rem;
  background: var(--paper-white);
  border: var(--about-hair);
}

.page-about .who__tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
}

.page-about .who__card h3 {
  margin: 0;
  font-family: var(--font-title);
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--grape-deep);
}

.page-about .who__card p {
  margin: 0;
  font-size: .85rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .steps {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .steps h3 {
  margin: 0 0 .65rem;
  font-family: var(--font-title);
  font-size: 1.08rem;
  color: var(--grape-deep);
}

.page-about .steps__list {
  counter-reset: sstep;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-about .steps__list li {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .45rem .8rem;
  font-size: .84rem;
  color: var(--ink);
  background: var(--paper-white);
  border: 1px solid rgba(46, 139, 109, .35);
}

.page-about .steps__list li::before {
  counter-increment: sstep;
  content: counter(sstep, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--vine);
}

.page-about .about-reply {
  margin: clamp(1rem, 3vw, 1.5rem) 0 0;
  padding-inline-start: .9rem;
  border-inline-start: 3px solid var(--vine);
  font-size: .85rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-reply .link-arrow {
  color: var(--vine);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 139, 109, .5);
}

.page-about .about-reply .link-arrow:hover {
  color: var(--grape);
  border-bottom-color: var(--grape);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: clamp(1rem, 3vw, 1.5rem);
}
<<<END>>>