.page-about {
  --about-gutter: clamp(20px, 5vw, 72px);
  --about-line: rgba(11, 59, 58, 0.14);
  background: var(--paper);
  color: var(--ink);
}

.page-about .shell {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--about-gutter);
}

.page-about .section {
  padding-block: clamp(48px, 7vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--on-ink-dim);
}

.page-about .breadcrumbs a {
  color: var(--gold-soft);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--gold);
  text-decoration: underline;
}

.page-about .breadcrumbs li span {
  color: var(--on-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 82% 12%, rgba(201, 162, 39, 0.22), transparent 55%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-deep) 62%, var(--ink-2) 100%);
  color: var(--mist);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(245, 241, 230, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(245, 241, 230, 0.07) 1px, transparent 1px);
  background-size: 78px 78px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: 42%;
  width: 62%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--gold), transparent);
  transform: rotate(-9deg);
  opacity: 0.65;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
  padding-block: clamp(32px, 6vw, 62px) clamp(36px, 5vw, 64px);
}

.page-about .about-hero__title {
  margin: 12px 0 20px;
  font-size: clamp(40px, 9vw, 92px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-hero__intro {
  max-width: 46ch;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--on-ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__index {
  border: 1px solid rgba(245, 241, 230, 0.16);
  border-left: 2px solid var(--gold);
  border-radius: var(--radius);
  background: rgba(245, 241, 230, 0.05);
  padding: 22px 20px;
  align-self: end;
}

.page-about .about-hero__index-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-soft);
}

.page-about .about-hero__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-hero__list li {
  display: grid;
  grid-template-columns: 32px 1fr;
  grid-template-areas:
    "no name"
    "no desc";
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid rgba(245, 241, 230, 0.1);
}

.page-about .about-hero__list li:last-child {
  border-bottom: 0;
}

.page-about .about-hero__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

.page-about .about-hero__list a {
  grid-area: name;
  color: var(--mist);
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 0.02em;
}

.page-about .about-hero__list a:hover {
  color: var(--gold-soft);
}

.page-about .about-hero__desc {
  grid-area: desc;
  font-size: 12px;
  color: var(--on-ink-dim);
  letter-spacing: 0.04em;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-height: 360px;
}

.page-about .about-hero__figure .media__caption {
  padding: 12px var(--about-gutter) 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--on-ink-dim);
}

/* ---------- 品牌定位 ---------- */
.page-about .about-position {
  background: var(--mist);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-position__inner {
  display: grid;
  gap: 40px;
}

.page-about .about-position__story h2 {
  margin: 12px 0 20px;
  font-size: clamp(28px, 4.4vw, 46px);
  font-weight: 400;
  line-height: 1.24;
  letter-spacing: 0.03em;
}

.page-about .about-position__story p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(11, 59, 58, 0.82);
}

.page-about .about-position__quote {
  margin-top: 24px;
  padding-left: 18px;
  border-left: 2px solid var(--gold);
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-2);
  letter-spacing: 0.04em;
}

.page-about .about-position__facts {
  display: grid;
  gap: 14px;
}

.page-about .about-fact {
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.page-about .about-fact h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--ink);
}

.page-about .about-fact p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(11, 59, 58, 0.72);
}

/* ---------- 职能矩阵 ---------- */
.page-about .about-roles {
  background: var(--paper);
}

.page-about .about-roles__head {
  display: grid;
  gap: 28px;
  margin-bottom: 32px;
}

.page-about .about-roles__head h2 {
  margin: 12px 0 16px;
  font-size: clamp(26px, 3.8vw, 42px);
  font-weight: 400;
  line-height: 1.26;
  letter-spacing: 0.03em;
}

.page-about .about-roles__lead {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(11, 59, 58, 0.78);
}

.page-about .about-roles__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink);
}

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

.page-about .about-roles__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .about-roles__bar .filter-btn {
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-roles__bar .filter-btn:hover {
  border-color: var(--gold);
  color: var(--ink);
}

.page-about .about-roles__bar .filter-btn[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--gold-soft);
}

.page-about .about-roles__bar .filter-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .about-roles__bar .filter-status {
  flex: 1 1 100%;
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(11, 59, 58, 0.55);
}

.page-about .about-roles__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  border-top: 2px solid var(--gold);
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--mist);
  padding: 22px 20px;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-role:hover {
  transform: translateY(-3px);
  background: #EFEADB;
}

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

.page-about .about-role__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--clay);
}

.page-about .about-role__title {
  margin: 10px 0 10px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.page-about .about-role__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(11, 59, 58, 0.78);
}

.page-about .about-role__link {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(11, 59, 58, 0.5);
}

/* ---------- 六类资料 ---------- */
.page-about .about-cats {
  background: linear-gradient(172deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--mist);
}

.page-about .about-cats .eyebrow {
  color: var(--gold-soft);
}

.page-about .about-cats__head h2 {
  margin: 12px 0 18px;
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 300;
  line-height: 1.26;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-cats__lead {
  margin: 0 0 32px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--on-ink);
}

.page-about .about-cats__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-cat {
  --cat-color: var(--gold);
  border: 1px solid rgba(245, 241, 230, 0.14);
  border-left: 3px solid var(--cat-color);
  border-radius: var(--radius);
  background: rgba(245, 241, 230, 0.045);
  padding: 20px 20px 22px;
}

.page-about .about-cat--1 { --cat-color: var(--t1); }
.page-about .about-cat--2 { --cat-color: var(--t2); }
.page-about .about-cat--3 { --cat-color: var(--t3); }
.page-about .about-cat--4 { --cat-color: var(--t4); }
.page-about .about-cat--5 { --cat-color: var(--t5); }
.page-about .about-cat--6 { --cat-color: var(--t6); }

.page-about .about-cat__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cat-color);
}

.page-about .about-cat h3 {
  margin: 10px 0 8px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .about-cat p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--on-ink);
}

.page-about .about-cats__foot {
  display: grid;
  gap: 20px;
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid rgba(245, 241, 230, 0.16);
}

.page-about .about-cats__foot p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-ink);
}

.page-about .about-cats__foot .btn {
  justify-self: start;
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  background: var(--mist);
}

.page-about .about-principles__head h2 {
  margin: 12px 0 30px;
  font-size: clamp(26px, 3.8vw, 42px);
  font-weight: 400;
  line-height: 1.26;
  letter-spacing: 0.03em;
}

.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-principle {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 4px 14px;
  padding: 20px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-principle:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-principle__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .about-principle h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-principle p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(11, 59, 58, 0.75);
}

/* ---------- 四阶段 ---------- */
.page-about .about-stages {
  background: var(--paper);
}

.page-about .about-stages__head h2 {
  margin: 12px 0 12px;
  font-size: clamp(26px, 3.8vw, 42px);
  font-weight: 400;
  line-height: 1.26;
  letter-spacing: 0.03em;
}

.page-about .about-stages__lead {
  margin: 0 0 34px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(11, 59, 58, 0.7);
}

.page-about .about-stages__track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-stage {
  position: relative;
  padding: 22px 0 22px 26px;
  border-left: 1px solid var(--about-line);
  transition: border-color 0.28s var(--ease);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 30px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--gold);
  transition: background 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .about-stage:hover {
  border-left-color: var(--gold);
}

.page-about .about-stage:hover::before {
  background: var(--gold);
  transform: scale(1.35);
}

.page-about .about-stage__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 54px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.04em;
  color: rgba(11, 59, 58, 0.16);
  transition: color 0.28s var(--ease);
}

.page-about .about-stage:hover .about-stage__num {
  color: var(--gold);
}

.page-about .about-stage__title {
  margin: 8px 0 8px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.page-about .about-stage__text {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(11, 59, 58, 0.78);
}

.page-about .about-stage__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: rgba(11, 59, 58, 0.48);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach {
  background: var(--ink-2);
  color: var(--mist);
  padding-bottom: 0;
}

.page-about .about-reach .eyebrow {
  color: var(--gold-soft);
}

.page-about .about-reach__inner {
  display: grid;
  gap: 36px;
  padding-bottom: clamp(40px, 6vw, 64px);
}

.page-about .about-reach__story h2 {
  margin: 12px 0 18px;
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 300;
  line-height: 1.28;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-reach__story p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-ink);
}

.page-about .about-reach__stats {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-stat {
  border: 1px solid rgba(245, 241, 230, 0.16);
  border-radius: var(--radius);
  padding: 18px 16px;
  background: rgba(245, 241, 230, 0.05);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--gold-soft);
}

.page-about .about-stat__unit {
  display: block;
  margin: 6px 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--on-ink-dim);
}

.page-about .about-stat p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--on-ink);
}

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

.page-about .about-reach__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-height: 340px;
}

.page-about .about-reach__figure .media__caption {
  padding: 12px var(--about-gutter) 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--on-ink-dim);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--paper);
}

.page-about .about-next__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-next__lead h2 {
  margin: 12px 0 16px;
  font-size: clamp(26px, 3.8vw, 42px);
  font-weight: 400;
  line-height: 1.26;
  letter-spacing: 0.03em;
}

.page-about .about-next__lead p {
  margin: 0 0 24px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(11, 59, 58, 0.8);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next__panel {
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--gold);
  border-radius: var(--radius);
  background: var(--mist);
  padding: 24px 22px;
}

.page-about .about-next__panel h3 {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .about-next__panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-next__panel li {
  display: grid;
  gap: 3px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-next__panel li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-next__panel span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(11, 59, 58, 0.5);
}

.page-about .about-next__panel strong {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-next__tip {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(11, 59, 58, 0.7);
}

.page-about .about-next__tip a {
  color: var(--ink-2);
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-underline-offset: 3px;
}

.page-about .about-next__tip a:hover {
  color: var(--gold);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
    align-items: end;
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .about-position__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-roles__head {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 0.7fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .about-cats__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-cats__foot {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .page-about .about-principles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .about-stages__track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
    border-top: 1px solid var(--about-line);
    padding-top: 30px;
  }

  .page-about .about-stage {
    padding: 0 12px 0 0;
    border-left: 0;
  }

  .page-about .about-stage::before {
    left: 0;
    top: -35px;
  }

  .page-about .about-reach__inner {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-roles__grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-roles__grid .about-role {
    padding: 22px 16px;
  }

  .page-about .about-reach__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-stage,
  .page-about .about-stage::before,
  .page-about .about-stage__num,
  .page-about .about-roles__bar .filter-btn {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}
<<<END>>>