.page-about {
  --about-rail: 190px;
  --about-gap: clamp(28px, 4vw, 72px);
  --about-line: 1px solid var(--line);
  background: var(--void);
  color: var(--text-1);
}

.page-about .container {
  width: min(var(--shell), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.page-about .about-hero {
  position: relative;
  padding: clamp(104px, 14vw, 172px) 0 clamp(40px, 6vw, 76px);
  border-bottom: var(--about-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: min(40vw, 460px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold));
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--text-3);
  margin-bottom: 28px;
}

.page-about .breadcrumb a {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: var(--stone);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-3);
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.4vw, 4.3rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 17ch;
  margin: 0 0 clamp(20px, 3vw, 34px);
  color: var(--text-1);
}

.page-about .about-hero__lede {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--text-2);
  max-width: 62ch;
  margin: 0;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  margin: clamp(34px, 5vw, 60px) 0 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .about-fact {
  flex: 1 1 180px;
  min-width: 0;
  padding: 20px 20px 20px 0;
}

.page-about .about-fact + .about-fact {
  padding-left: 22px;
  border-left: var(--about-line);
}

.page-about .about-fact dt {
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--text-3);
  margin-bottom: 8px;
}

.page-about .about-fact dd {
  margin: 0;
  font-size: .92rem;
  color: var(--text-2);
  line-height: 1.5;
}

.page-about .about-fact dd strong {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--gold);
  margin-right: 4px;
}

/* ---------- 索引 + 主体 ---------- */

.page-about .about-shell {
  padding-top: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(72px, 10vw, 140px);
}

.page-about .about-index {
  padding-bottom: 20px;
  border-bottom: var(--about-line);
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-index__label {
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--text-3);
  margin: 0 0 14px;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .toc-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--capsule);
  font-family: var(--font-body);
  font-size: .84rem;
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .toc-index__link .mono {
  font-size: .68rem;
  color: var(--text-3);
}

.page-about .toc-index__link:hover {
  color: var(--text-1);
  border-color: var(--line-strong);
}

.page-about .toc-index__link[data-active] {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .toc-index__link[data-active] .mono {
  color: var(--gold);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  scroll-margin-top: 110px;
  padding-block: clamp(40px, 6vw, 76px);
  border-bottom: var(--about-line);
}

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

.page-about .about-section--tight {
  padding-block: clamp(30px, 4.2vw, 56px);
}

.page-about .about-section--self {
  padding-top: 0;
}

.page-about .about-section__head {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .about-section__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  max-width: 24ch;
  margin: 0;
  color: var(--text-1);
}

.page-about .about-section__lede {
  font-family: var(--font-body);
  line-height: 1.85;
  color: var(--text-2);
  max-width: 68ch;
  margin: 16px 0 0;
}

.page-about .prose p {
  font-family: var(--font-body);
  line-height: 1.85;
  color: var(--text-2);
  max-width: 74ch;
  margin: 0 0 1.1em;
}

.page-about .prose a,
.page-about .about-compliance a {
  color: var(--violet-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .prose a:hover,
.page-about .about-compliance a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 01 品牌自述 ---------- */

.page-about .about-self__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.6vw, 52px);
  align-items: start;
}

.page-about .about-self__quote {
  margin: 28px 0;
  padding: 4px 0 4px 22px;
  border-left: 2px solid var(--gold);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.1vw, 1.4rem);
  line-height: 1.6;
  color: var(--text-1);
  max-width: 30ch;
}

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

.page-about .about-self__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: var(--about-line);
  aspect-ratio: 3 / 4;
}

.page-about .about-figure__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  line-height: 1.7;
  color: var(--text-3);
  max-width: 34ch;
}

/* ---------- 02 业务边界 ---------- */

.page-about .about-scope {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-scope__label {
  font-size: .72rem;
  letter-spacing: .12em;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: var(--about-line);
}

.page-about .about-scope__col--yes .about-scope__label {
  color: var(--moss);
}

.page-about .about-scope__col--no .about-scope__label {
  color: var(--clay);
}

.page-about .about-scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-scope__list li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(92, 100, 114, .4);
  font-family: var(--font-body);
  font-size: .93rem;
  line-height: 1.75;
  color: var(--text-2);
}

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

.page-about .about-scope__code {
  font-size: .7rem;
  color: var(--text-3);
  padding-top: 4px;
}

.page-about .about-scope__col--yes .about-scope__code {
  color: var(--moss);
}

.page-about .about-scope__col--no .about-scope__code {
  color: var(--clay);
}

/* ---------- 03 口径编制 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-step {
  position: relative;
  padding: 20px 0 20px 74px;
  border-top: var(--about-line);
}

.page-about .about-step__num {
  position: absolute;
  left: 0;
  top: 24px;
  font-size: .74rem;
  color: var(--gold);
}

.page-about .about-step__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  margin: 0 0 8px;
  color: var(--text-1);
}

.page-about .about-step__desc {
  font-family: var(--font-body);
  font-size: .92rem;
  line-height: 1.8;
  color: var(--text-2);
  margin: 0;
  max-width: 66ch;
}

.page-about .about-fields {
  margin-top: clamp(24px, 3.4vw, 40px);
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--void-deep);
  border: var(--about-line);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .about-fields__label {
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--text-3);
  margin: 0 0 16px;
}

.page-about .about-fields__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  counter-reset: fld;
}

.page-about .about-fields__list li {
  counter-increment: fld;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--capsule);
  font-family: var(--font-body);
  font-size: .84rem;
  color: var(--text-1);
}

.page-about .about-fields__list li::before {
  content: counter(fld, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .04em;
  color: var(--gold);
}

/* ---------- 04 对照矩阵 ---------- */

.page-about .about-matrix__figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-matrix__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  border: var(--about-line);
}

.page-about .about-matrix__scroll {
  overflow-x: auto;
  border: var(--about-line);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-matrix {
  width: 100%;
  min-width: 620px;
  border-collapse: separate;
  border-spacing: 0;
  font-family: var(--font-mono);
  font-size: .8rem;
}

.page-about .about-matrix__caption {
  caption-side: top;
  text-align: left;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--text-3);
  border-bottom: var(--about-line);
}

.page-about .about-matrix th,
.page-about .about-matrix td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(142, 134, 240, .18);
  white-space: nowrap;
}

.page-about .about-matrix thead th {
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--text-3);
  background: var(--void-deep);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-matrix tbody th {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--void);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: .9rem;
  color: var(--text-1);
  border-right: var(--about-line);
}

.page-about .about-matrix tbody tr:last-child th,
.page-about .about-matrix tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-matrix td {
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-matrix td.about-cell--primary {
  color: var(--gold);
  box-shadow: inset 0 0 0 1px rgba(217, 164, 65, .55);
}

.page-about .about-matrix td.about-cell--secondary {
  color: var(--violet-soft);
}

.page-about .about-matrix td.about-cell--tertiary {
  color: var(--text-3);
}

.page-about .status-dot--violet {
  background: var(--violet-soft);
}

.page-about .status-dot--stone {
  background: var(--stone);
}

.page-about .about-matrix__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 18px 0 0;
}

.page-about .legend__item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .03em;
  color: var(--text-3);
}

.page-about .legend__swatch--stone {
  background: var(--stone);
}

.page-about .about-matrix__notes {
  margin-top: clamp(22px, 3vw, 34px);
  border-top: var(--about-line);
}

/* ---------- 折叠组（矩阵说明 + 流程交付物） ---------- */

.page-about .disclosure__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 0;
  background: none;
  border: 0;
  border-bottom: var(--about-line);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  font-size: .95rem;
  color: var(--text-1);
}

.page-about .disclosure__num {
  font-size: .7rem;
  color: var(--gold);
  flex: 0 0 auto;
}

.page-about .about-fold-group__name {
  flex: 1 1 auto;
}

.page-about .disclosure__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-about .disclosure__icon::before,
.page-about .disclosure__icon::after {
  content: "";
  position: absolute;
  background: var(--text-3);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .disclosure__icon::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-about .disclosure__icon::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-about .disclosure__trigger[aria-expanded="true"] .disclosure__icon::after {
  transform: scaleY(0);
}

.page-about .disclosure__trigger[aria-expanded="true"] .disclosure__icon::before {
  background: var(--gold);
}

.page-about .about-fold {
  padding: 0 0 20px;
  border-bottom: var(--about-line);
}

.page-about .about-fold[data-open="false"] {
  display: none;
}

.page-about .about-fold p {
  font-family: var(--font-body);
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-2);
  margin: 16px 0 0;
  max-width: 70ch;
}

/* ---------- 05 协作流程 ---------- */

.page-about .about-flow__figure {
  margin: 0 0 clamp(24px, 3.4vw, 40px);
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  max-height: 200px;
  object-fit: cover;
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-flow__item {
  position: relative;
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--violet-soft);
  box-shadow: 0 0 0 3px var(--void);
}

.page-about .about-flow__trigger {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 16px;
  width: 100%;
  padding: 16px 0;
  background: none;
  border: 0;
  border-bottom: var(--about-line);
  cursor: pointer;
  text-align: left;
}

.page-about .about-flow__num {
  font-size: .72rem;
  color: var(--gold);
}

.page-about .about-flow__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-1);
  flex: 1 1 auto;
}

.page-about .about-flow__dur {
  font-size: .74rem;
  color: var(--text-3);
}

.page-about .about-flow__hand {
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--text-3);
  margin: 16px 0 10px;
}

.page-about .about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-flow__list li {
  position: relative;
  padding: 6px 0 6px 20px;
  font-family: var(--font-body);
  font-size: .9rem;
  line-height: 1.75;
  color: var(--text-2);
}

.page-about .about-flow__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-flow__foot {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-family: var(--font-body);
  font-size: .9rem;
  line-height: 1.8;
  color: var(--text-3);
  max-width: 66ch;
}

.page-about .about-flow__foot a {
  color: var(--violet-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

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

/* ---------- 06 团队与资质 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: var(--about-line);
}

.page-about .about-team__item {
  padding: 22px 0;
  border-bottom: var(--about-line);
}

.page-about .about-team__code {
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--text-3);
  margin: 0 0 10px;
}

.page-about .about-team__item--rail .about-team__code {
  color: var(--cyan);
}

.page-about .about-team__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.08rem;
  margin: 0 0 8px;
  color: var(--text-1);
}

.page-about .about-team__desc {
  font-family: var(--font-body);
  font-size: .92rem;
  line-height: 1.8;
  color: var(--text-2);
  margin: 0;
  max-width: 60ch;
}

.page-about .about-team__item--rail {
  border-left: 2px solid var(--cyan);
  padding-left: 18px;
  margin-left: 0;
}

.page-about .about-compliance {
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-compliance__label {
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--text-3);
  margin: 0 0 16px;
}

.page-about .about-compliance__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-compliance__list li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  font-family: var(--font-body);
  font-size: .92rem;
  line-height: 1.75;
  color: var(--text-2);
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(92, 100, 114, .4);
}

.page-about .about-compliance__list .mono {
  font-size: .7rem;
  color: var(--moss);
  padding-top: 4px;
}

.page-about .about-compliance__note {
  font-family: var(--font-body);
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-3);
  max-width: 70ch;
  margin: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-scope {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-compliance__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }
}

@media (min-width: 900px) {
  .page-about .about-self__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .8fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
    border-bottom: 0;
    padding-bottom: 0;
    margin-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .toc-index__link {
    display: flex;
    justify-content: flex-start;
    width: 100%;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    font-size: .86rem;
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .page-about .toc-index__link:hover,
  .page-about .toc-index__link[data-active] {
    border-left-color: var(--gold);
    border-top-color: transparent;
  }

  .page-about .about-section--self {
    padding-top: clamp(24px, 3vw, 40px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-index__link,
  .page-about .breadcrumb a,
  .page-about .prose a,
  .page-about .about-compliance a,
  .page-about .about-flow__foot a,
  .page-about .disclosure__icon::before,
  .page-about .disclosure__icon::after {
    transition: none;
  }
}