.page-about {
  --about-pad: clamp(18px, 4vw, 40px);
  --about-gap: clamp(34px, 6vw, 68px);
  --about-cut: 18px;
  background: var(--ink);
  color: var(--white);
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-shell {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--about-pad);
}

/* ---------- 首屏 ---------- */
.page-about .about-mast {
  position: relative;
  padding: clamp(24px, 4.5vw, 52px) 0 clamp(22px, 3.6vw, 38px);
  border-bottom: 1px solid var(--line-gold);
}
.page-about .about-mast::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: clamp(18px, 3vw, 30px);
  background: var(--line);
}
.page-about .breadcrumb__link,
.page-about .breadcrumb__current {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.page-about .eyebrow {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--gold);
}
.page-about .about-title {
  font-family: var(--font-serif);
  font-size: clamp(30px, 5.6vw, 60px);
  line-height: 1.18;
  letter-spacing: .01em;
  margin: clamp(12px, 2vw, 20px) 0 0;
  max-width: 15em;
  color: var(--white);
}
.page-about .about-lede {
  margin-top: clamp(16px, 2.4vw, 24px);
  max-width: 62ch;
  color: rgba(247, 244, 238, .82);
  font-size: clamp(15px, 1.7vw, 17.5px);
  line-height: 1.9;
}

.page-about .about-marks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 720px) {
  .page-about .about-marks { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.page-about .about-mark {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 14px 16px;
  background: var(--ink-2);
}
.page-about .about-mark__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--steel);
}
.page-about .about-mark__v {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold-soft);
}

/* ---------- 长卷骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(30px, 4vw, 60px);
    align-items: start;
  }
}
.page-about .about-column { min-width: 0; }

.page-about .about-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  padding: 10px 0 12px;
  background: linear-gradient(180deg, var(--ink) 74%, rgba(11, 34, 57, 0));
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-rail::-webkit-scrollbar { display: none; }
.page-about .about-rail__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 10px 9px;
  font-size: 13px;
  line-height: 1.3;
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color .18s, border-color .18s;
}
.page-about .about-rail__link .mono {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gold);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}
@media (min-width: 900px) {
  .page-about .about-rail {
    position: sticky;
    top: 84px;
    padding: 4px 0 0;
    background: none;
    overflow: visible;
  }
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
  }
  .page-about .about-rail__link {
    display: flex;
    padding: 11px 0 11px 12px;
    white-space: normal;
    border-bottom: 0;
    border-left: 2px solid var(--line);
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-bottom-color: transparent;
    border-left-color: var(--gold);
    background: linear-gradient(90deg, rgba(216, 179, 106, .1), transparent 78%);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 92px;
}
.page-about .about-section:first-child {
  border-top: 0;
  padding-top: clamp(22px, 3.6vw, 38px);
}
.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.page-about .about-head__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}
.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(23px, 3.3vw, 33px);
  line-height: 1.32;
  color: var(--white);
}
.page-about .about-p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.55vw, 16.5px);
  line-height: 1.9;
  color: rgba(247, 244, 238, .84);
}
.page-about .about-p:last-child { margin-bottom: 0; }
.page-about .about-p--lead {
  margin-top: clamp(14px, 2vw, 20px);
  max-width: 60ch;
  color: rgba(247, 244, 238, .72);
}
.page-about .about-p--gap { margin-top: clamp(22px, 3vw, 32px); }

/* ---------- 图片 ---------- */
.page-about .about-fig { margin: 0; }
.page-about .about-fig__media {
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line-gold);
}
.page-about .about-fig__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-fig figcaption {
  margin-top: 10px;
  padding-left: 11px;
  border-left: 2px solid var(--gold);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--steel);
}
.page-about .about-fig--wide { margin-top: clamp(24px, 3.4vw, 36px); }

/* ---------- 01 使命 ---------- */
.page-about .about-creed {
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(22px, 3.6vw, 40px);
  background: linear-gradient(155deg, var(--ink-2) 0%, var(--ink-3) 82%);
  clip-path: polygon(
    0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    var(--about-cut) 100%,
    0 calc(100% - var(--about-cut))
  );
  box-shadow: inset 0 0 0 1px rgba(216, 179, 106, .3);
}
.page-about .about-creed__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 38px);
}
@media (min-width: 820px) {
  .page-about .about-creed__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: start;
  }
  .page-about .about-creed__fig { margin-top: 26px; }
}

/* ---------- 02 人群 ---------- */
.page-about .about-audience {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(20px, 3vw, 30px);
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 760px) {
  .page-about .about-audience { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .about-persona {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-2);
  border-top: 3px solid var(--gold);
}
.page-about .about-persona:nth-child(2) { border-top-color: var(--coral); }
.page-about .about-persona:nth-child(3) { border-top-color: var(--green); }
.page-about .about-persona__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--steel);
}
.page-about .about-persona h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(18px, 2vw, 20px);
  line-height: 1.42;
  color: var(--white);
}
.page-about .about-persona p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(247, 244, 238, .8);
}
.page-about .about-persona__get {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--gold-soft);
}

/* ---------- 03 四步法 ---------- */
.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(18px, 2.8vw, 26px);
}
.page-about .about-chips .chip {
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  cursor: pointer;
  transition: color .18s, border-color .18s, background .18s;
}
.page-about .about-chips .chip:hover { color: var(--gold-soft); border-color: var(--line-gold); }
.page-about .about-chips .chip:focus-visible { outline: 2px solid var(--gold-soft); outline-offset: 2px; }
.page-about .about-chips .chip[aria-pressed="true"] {
  color: var(--brown);
  background: var(--coral);
  border-color: var(--coral);
}

.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(18px, 2.8vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}
@media (min-width: 780px) {
  .page-about .about-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.page-about .about-step {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}
.page-about .about-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--coral);
}
.page-about .about-step h3 {
  margin: 9px 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(17px, 1.9vw, 19px);
  line-height: 1.45;
  color: var(--white);
}
.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(247, 244, 238, .82);
}
.page-about .about-step__meta {
  display: block;
  margin-top: 13px;
  padding-top: 11px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--steel);
}

/* ---------- 04 历程 ---------- */
.page-about .about-route {
  display: block;
  width: 100%;
  height: auto;
  margin-top: clamp(16px, 2.6vw, 24px);
}
.page-about .about-route path { stroke: var(--gold); opacity: .78; }
.page-about .about-route circle { fill: var(--gold-soft); }

.page-about .about-miles {
  display: grid;
  gap: 8px;
  margin: clamp(10px, 1.6vw, 16px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-mile {
  border-left: 2px solid var(--line-gold);
  transition: border-color .18s;
}
.page-about .about-mile:hover { border-left-color: var(--gold); }
.page-about .about-mile__d { padding-left: 0; }
.page-about .about-mile summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 14px 6px 14px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-mile summary::-webkit-details-marker { display: none; }
.page-about .about-mile summary:focus-visible { outline: 2px solid var(--gold-soft); outline-offset: -2px; }
.page-about .about-mile__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gold);
  white-space: nowrap;
}
.page-about .about-mile__name {
  font-family: var(--font-serif);
  font-size: clamp(16.5px, 1.9vw, 20px);
  line-height: 1.45;
  color: var(--white);
}
.page-about .about-mile__cue {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--steel);
  transition: transform .18s, color .18s;
}
.page-about .about-mile__d[open] .about-mile__cue {
  transform: rotate(90deg);
  color: var(--coral);
}
.page-about .about-mile__body {
  margin: 0;
  padding: 0 6px 16px 16px;
  font-size: 14.5px;
  line-height: 1.88;
  color: rgba(247, 244, 238, .8);
}

/* ---------- 05 团队 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(18px, 2.8vw, 28px);
}
@media (min-width: 760px) {
  .page-about .about-roles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .about-role {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--ink-2);
  border-left: 3px solid var(--gold);
}
.page-about .about-role h3 {
  margin: 0 0 9px;
  font-family: var(--font-serif);
  font-size: clamp(17px, 1.9vw, 19px);
  color: var(--white);
}
.page-about .about-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.84;
  color: rgba(247, 244, 238, .8);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 720px) {
  .page-about .about-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.page-about .about-stat {
  padding: 16px 14px;
  background: var(--ink-3);
}
.page-about .about-stat__n {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.5vw, 25px);
  letter-spacing: .02em;
  color: var(--gold-soft);
}
.page-about .about-stat__k {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 06 复核 ---------- */
.page-about .about-quality {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 30px);
}
@media (min-width: 820px) {
  .page-about .about-quality {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }
}
.page-about .about-paper {
  padding: clamp(20px, 3vw, 34px);
  background: var(--paper);
  color: var(--brown);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}
.page-about .about-paper h3 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.4;
  color: var(--brown);
}
.page-about .about-paper p {
  margin: 0 0 .95em;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(27, 23, 18, .84);
}
.page-about .about-paper p:last-child { margin-bottom: 0; }

/* ---------- 收束 ---------- */
.page-about .about-next {
  margin-top: clamp(34px, 5vw, 58px);
  padding-top: clamp(24px, 3.4vw, 38px);
  border-top: 1px solid var(--line-gold);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
@media (min-width: 820px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}
.page-about .about-next__t { font-size: clamp(20px, 2.6vw, 27px); }
.page-about .about-next .about-p { margin-top: 12px; max-width: 56ch; }
.page-about .about-next__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-next__acts .btn { text-align: center; }

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-mile,
  .page-about .about-mile__cue,
  .page-about .about-chips .chip {
    transition: none;
  }
}
<<<END>>>