.page-about {
  --about-gutter: clamp(16px, 4vw, 48px);
  background: var(--paper);
  color: var(--charcoal);
}

.page-about .about-crumb {
  padding-top: 24px;
}

.page-about .about-crumb .breadcrumbs {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 56px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -18% -12% auto -12%;
  height: 560px;
  background:
    radial-gradient(58% 62% at 16% 22%, rgba(217, 162, 75, 0.2), transparent 70%),
    radial-gradient(52% 54% at 88% 0%, rgba(165, 61, 42, 0.15), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 32px;
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--charcoal);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 36px;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact__num {
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  font-weight: 700;
  color: var(--ochre);
}

.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.page-about .about-hero__figure {
  margin: 0;
  padding: 10px;
  background: var(--paper-deep);
  clip-path: var(--cut);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--cut-sm);
  background: var(--ink);
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: rgba(236, 227, 211, 0.55);
}

.page-about .about-index__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  background: transparent;
  border: 1px solid var(--rule);
  clip-path: var(--cut-sm);
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-index__list a:hover {
  background: var(--mist);
}

.page-about .about-index__list a.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-about .about-index__num {
  font-size: 11px;
  color: var(--ochre);
}

.page-about .about-index__list a.is-active .about-index__num {
  color: var(--sand);
}

/* ---------- 章节通用 ---------- */

.page-about .about-head {
  max-width: 44em;
}

.page-about .about-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--charcoal);
}

.page-about .about-head .lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-head--ink h2 {
  color: var(--paper);
}

.page-about .about-head--ink .lede {
  color: rgba(245, 239, 228, 0.78);
}

.page-about .about-head--ink .eyebrow {
  color: var(--sand);
}

/* ---------- 01 服务对象 ---------- */

.page-about .about-split {
  display: grid;
  gap: 30px;
}

.page-about .about-split__aside h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.page-about .about-split__note {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

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

.page-about .about-aud {
  padding: 26px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-aud:first-child {
  border-top: 2px solid var(--ochre);
}

.page-about .about-aud h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: -0.01em;
}

.page-about .about-aud p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 52em;
}

.page-about .about-aud__link {
  margin-top: 12px !important;
}

.page-about .about-aud__link a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.page-about .about-aud__link a:hover {
  color: var(--ochre);
}

/* ---------- 02 六维评测 ---------- */

.page-about .about-dim-list {
  margin-top: 36px;
  border-bottom: 1px solid var(--rule);
}

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

.page-about .about-dim summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--charcoal);
  transition: color 0.25s var(--ease);
}

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

.page-about .about-dim summary:hover {
  color: var(--ochre);
}

.page-about .about-dim summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--ochre);
}

.page-about .about-dim[open] summary::after {
  content: "–";
}

.page-about .about-dim summary .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .about-dim p {
  margin: 0 0 22px;
  padding-left: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 60ch;
}

/* ---------- 03 V4 面板演进 ---------- */

.page-about .about-v4 {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-v4::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    116deg,
    rgba(245, 239, 228, 0.055) 0 1px,
    transparent 1px 28px
  );
  pointer-events: none;
}

.page-about .about-v4__inner {
  position: relative;
}

.page-about .about-v4__figure {
  margin: 34px 0 0;
}

.page-about .about-v4__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--cut);
  border: 1px solid rgba(245, 239, 228, 0.18);
  background: var(--ink-soft);
}

.page-about .about-v4__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(245, 239, 228, 0.6);
}

.page-about .about-gen {
  display: grid;
  gap: 14px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-gen li {
  padding: 20px 20px 22px;
  background: rgba(245, 239, 228, 0.06);
  border-left: 3px solid var(--sand);
  clip-path: var(--cut);
}

.page-about .about-gen li:nth-child(2) {
  border-left-color: var(--teal);
}

.page-about .about-gen li:nth-child(3) {
  border-left-color: var(--ochre);
}

.page-about .about-gen__tag {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(245, 239, 228, 0.6);
}

.page-about .about-gen h3 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper);
}

.page-about .about-gen p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 239, 228, 0.76);
}

.page-about .about-paths {
  margin-top: 32px;
  padding: 22px;
  background: var(--mist);
  color: var(--ink);
  clip-path: var(--cut);
}

.page-about .about-paths__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ochre-deep);
}

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

.page-about .about-paths li {
  font-size: 14px;
  line-height: 1.75;
  padding-left: 14px;
  border-left: 2px solid var(--ochre);
}

.page-about .about-paths strong {
  display: block;
  font-weight: 700;
  margin-bottom: 2px;
}

/* ---------- 04 团队与节奏 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-team__text h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.page-about .about-team__text > p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__num {
  font-size: 28px;
  line-height: 1;
  font-weight: 700;
  color: var(--ochre);
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.page-about .about-rhythm {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .about-rhythm__item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-rhythm__cycle {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--teal);
}

.page-about .about-rhythm__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--cut);
  background: var(--paper-deep);
}

.page-about .about-team__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

/* ---------- 05 发展轨迹 ---------- */

.page-about .about-track {
  position: relative;
  display: grid;
  gap: 8px;
  margin: 40px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--ochre) 0%, var(--sand) 55%, var(--teal) 100%);
}

.page-about .about-stage {
  position: relative;
  padding: 18px 20px 20px;
  background: var(--paper-deep);
  clip-path: var(--cut-sm);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 26px;
  width: 12px;
  height: 12px;
  background: var(--ochre);
  transform: rotate(45deg);
  transition: background 0.3s var(--ease);
}

.page-about .about-stage:hover {
  transform: translateX(4px);
  background: var(--mist);
}

.page-about .about-stage:hover::before {
  background: var(--teal);
}

.page-about .about-stage__tag {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-stage h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
}

.page-about .about-stage p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 46em;
}

/* ---------- 06 服务与合作 ---------- */

.page-about .about-service__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-service__grid h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.page-about .about-service__grid > div > p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-stats--wide {
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.page-about .about-partners {
  padding: 24px;
  background: var(--pale-teal);
  clip-path: var(--cut);
}

.page-about .about-partners h3 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-partners ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .about-partners li {
  padding-top: 16px;
  border-top: 1px solid rgba(21, 36, 51, 0.16);
}

.page-about .about-partners li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-partners__tag {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--teal);
}

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

/* ---------- 07 荣誉与下一步 ---------- */

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

.page-about .about-cta__inner {
  display: grid;
  gap: 32px;
}

.page-about .about-cta__text h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.page-about .about-honor {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-honor__item {
  padding: 16px 18px;
  background: var(--paper-deep);
  border-left: 3px solid var(--sand);
  clip-path: var(--cut-sm);
}

.page-about .about-honor__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
}

.page-about .about-honor__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-cta__actions {
  padding: 24px;
  background: var(--ink);
  color: var(--paper);
  clip-path: var(--cut);
}

.page-about .about-cta__actions > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 239, 228, 0.82);
}

.page-about .about-cta__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-crumb {
    padding-top: 32px;
  }

  .page-about .about-hero {
    padding: 44px 0 72px;
  }

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

  .page-about .about-dim p {
    padding-left: 34px;
  }

  .page-about .about-rhythm__item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

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

  .page-about .about-paths ul {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
    gap: var(--about-gutter);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: var(--about-gutter);
    align-items: start;
  }

  .page-about .about-split__aside {
    position: sticky;
    top: 108px;
  }

  .page-about .about-team__grid,
  .page-about .about-service__grid,
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--about-gutter);
    align-items: start;
  }

  .page-about .about-team__figure,
  .page-about .about-partners,
  .page-about .about-cta__actions {
    margin-top: 6px;
  }

  .page-about .about-track {
    gap: 16px;
    padding-left: 0;
  }

  .page-about .about-track::before {
    left: 50%;
    top: 8px;
    bottom: 8px;
    transform: translateX(-1px);
  }

  .page-about .about-stage {
    width: calc(50% - 36px);
  }

  .page-about .about-stage:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-stage:nth-child(odd)::before {
    left: auto;
    right: -42px;
  }

  .page-about .about-stage:nth-child(even)::before {
    left: -42px;
  }

  .page-about .about-stage p {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-index__list a,
  .page-about .about-dim summary,
  .page-about .about-stage::before {
    transition: none;
  }

  .page-about .about-stage:hover {
    transform: none;
  }
}