.page-about {
  --about-rule: rgba(217, 162, 74, 0.3);
  --about-rule-soft: rgba(217, 162, 74, 0.14);
  --about-ink-line: rgba(244, 235, 220, 0.14);
  --about-tl: clamp(26px, 4vw, 42px);
  background: var(--cream);
  color: var(--text-ink);
  font-family: var(--font-body);
  font-size: var(--step-body);
  line-height: 1.75;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  margin: 0;
  line-height: 1.2;
  font-weight: 700;
}

.page-about p {
  margin: 0 0 var(--stack);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about a {
  color: var(--vermilion);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--vermilion-hot);
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

/* ---------- 章节锚点索引 ---------- */
.page-about .about-anchor {
  display: none;
}

@media (min-width: 1320px) {
  .page-about .about-anchor {
    display: block;
    position: fixed;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    padding: 14px 12px;
    border-left: 2px solid var(--about-rule);
    background: rgba(244, 235, 220, 0.82);
    backdrop-filter: blur(4px);
  }
}

.page-about .about-anchor__cap {
  font-size: var(--step-index);
  color: var(--muted);
  margin: 0 0 8px;
  letter-spacing: 0.2em;
}

.page-about .about-anchor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-anchor__list a {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: var(--step-index);
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-anchor__list a .mono {
  color: var(--gold);
  font-size: 0.7rem;
}

.page-about .about-anchor__list a:hover,
.page-about .about-anchor__list a:focus-visible {
  color: var(--text-ink);
  border-bottom-color: var(--vermilion);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--on-ink);
  background:
    radial-gradient(circle at 82% 18%, rgba(200, 41, 29, 0.24), transparent 48%),
    linear-gradient(180deg, var(--ink) 0%, #191410 100%);
  padding: clamp(20px, 3.6vw, 36px) 0 clamp(46px, 7vw, 92px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(217, 162, 74, 0.06) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(217, 162, 74, 0.06) 0 1px, transparent 1px 48px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 clamp(24px, 4vw, 44px);
  padding: 0;
  font-size: var(--step-index);
  font-family: var(--font-mono);
}

.page-about .about-hero .breadcrumb__link {
  color: var(--on-ink-dim);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--gold-lite);
}

.page-about .about-hero .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--gold);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--gold-lite);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 6vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--cream);
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold-lite);
  display: inline-block;
  border-bottom: 3px solid var(--vermilion);
  padding-bottom: 2px;
}

.page-about .about-hero__lead {
  max-width: 46ch;
  color: var(--on-ink);
  font-size: var(--step-body);
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px solid var(--about-ink-line);
  font-size: var(--step-index);
  color: var(--on-ink-dim);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-hero__facts .mono {
  color: var(--gold-lite);
  font-size: 1rem;
  letter-spacing: 0.06em;
}

.page-about .about-hero__mark {
  position: relative;
  align-self: stretch;
  display: grid;
  place-items: center;
  background: var(--ink-2);
  border: 1px solid var(--about-rule);
  padding: clamp(18px, 3vw, 32px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  min-height: 220px;
}

.page-about .about-mark {
  width: min(70%, 220px);
  height: auto;
}

.page-about .m-frame { fill: none; stroke: var(--gold); stroke-width: 1.4; opacity: 0.45; }
.page-about .m-axis { fill: none; stroke: var(--gold); stroke-width: 1.4; opacity: 0.6; }
.page-about .m-ring { fill: none; stroke: var(--gold-lite); stroke-width: 2.6; }
.page-about .m-body { fill: none; stroke: var(--vermilion-hot); stroke-width: 2.6; }
.page-about .m-beard { fill: none; stroke: var(--gold); stroke-width: 2; }
.page-about .m-dot { fill: var(--vermilion-hot); }

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: stretch;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(44px, 6vw, 88px) 0;
  position: relative;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-row__index {
  display: none;
}

.page-about .about-row__main > p:first-of-type {
  margin-top: clamp(14px, 2vw, 20px);
}

.page-about .about-num {
  display: block;
  font-size: var(--step-index);
  letter-spacing: 0.22em;
  color: var(--vermilion);
  padding-top: 10px;
  position: relative;
  padding-left: 30px;
}

.page-about .about-num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 20px;
  height: 2px;
  background: var(--vermilion);
}

.page-about .about-sec__title {
  font-size: var(--step-chapter);
  letter-spacing: -0.005em;
  color: var(--text-ink);
  margin-bottom: clamp(4px, 1vw, 10px);
}

.page-about .about-sec__title--onink {
  color: var(--cream);
}

.page-about .about-sec__intro {
  color: var(--muted);
  font-size: var(--step-index);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-sec__tail {
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: 18px;
  border-top: 1px solid var(--about-rule-soft);
  font-size: var(--step-body);
  color: var(--muted);
}

.page-about .about-row__main--narrow {
  max-width: 72ch;
}

@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: 68px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-row__index {
    display: block;
  }
  .page-about .about-row--side {
    grid-template-columns: 68px minmax(0, 7fr) minmax(0, 4fr);
  }
}

.page-about .about-row__side--sticky {
  align-self: start;
}

@media (min-width: 900px) {
  .page-about .about-row__side--sticky {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 缘起 ---------- */
.page-about .about-points {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule-soft);
  border: 1px solid var(--about-rule-soft);
}

.page-about .about-points li {
  background: var(--cream);
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  font-size: var(--step-index);
  color: var(--text-ink);
}

.page-about .about-points__k {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--vermilion);
  color: var(--vermilion);
  font-size: 0.8rem;
  transform: rotate(-2deg);
}

.page-about .img-frame {
  margin: 0;
  border: 1px solid var(--about-rule-soft);
  background: var(--cream-2);
  overflow: hidden;
}

.page-about .img-frame--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .img-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .img-frame__caption {
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
  padding: 10px 12px;
  border-top: 1px solid var(--about-rule-soft);
  font-family: var(--font-body);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0 0 0 var(--about-tl);
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--vermilion) 60%, rgba(200, 41, 29, 0) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
  outline: none;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-tl) + 1px);
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--cream);
  border: 2px solid var(--vermilion);
  transform: rotate(45deg);
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--vermilion);
  border-color: var(--vermilion);
}

.page-about .tl__item:focus-visible {
  box-shadow: inset 0 0 0 2px var(--gold);
}

.page-about .tl__meta {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin: 0 0 4px;
}

.page-about .tl__title {
  font-size: var(--step-sub);
  color: var(--text-ink);
  margin: 0 0 6px;
}

.page-about .tl__text {
  margin: 0;
  color: var(--text-ink);
}

.page-about .tl__more {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 280ms var(--ease), opacity 220ms var(--ease);
}

.page-about .tl__more > p {
  overflow: hidden;
  margin: 0;
  font-size: var(--step-index);
  color: var(--muted);
  line-height: 1.7;
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus-within .tl__more {
  grid-template-rows: 1fr;
  opacity: 1;
}

.page-about .tl__item:hover .tl__more > p,
.page-about .tl__item:focus-within .tl__more > p {
  padding-top: 8px;
}

/* ---------- 团队 ---------- */
.page-about .about-sec--team {
  background: var(--cream-2);
}

.page-about .team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(124, 111, 98, 0.28);
  border: 1px solid rgba(124, 111, 98, 0.28);
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .team__card {
  background: var(--cream);
  padding: clamp(16px, 2.4vw, 22px);
  outline: none;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .team__card:hover,
.page-about .team__card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 10px 26px rgba(20, 16, 14, 0.14);
}

.page-about .team__card:focus-visible {
  box-shadow: inset 0 0 0 2px var(--vermilion);
}

.page-about .team__num {
  display: inline-block;
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.2em;
  border-bottom: 1px solid var(--about-rule);
  padding-bottom: 2px;
  margin-bottom: 10px;
}

.page-about .team__name {
  font-size: var(--step-sub);
  color: var(--text-ink);
  margin-bottom: 6px;
}

.page-about .team__desc {
  font-size: var(--step-index);
  color: var(--muted);
  margin: 0;
}

.page-about .team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 280ms var(--ease), opacity 220ms var(--ease);
}

.page-about .team__list > li {
  overflow: hidden;
  font-size: var(--step-index);
  line-height: 1.7;
  color: var(--text-ink);
  border-left: 2px solid var(--vermilion);
  padding-left: 10px;
}

.page-about .team__card:hover .team__list,
.page-about .team__card:focus-within .team__list {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 12px;
  gap: 6px;
}

.page-about .about-flow-figure {
  margin-top: clamp(22px, 3vw, 30px);
}

@media (min-width: 700px) {
  .page-about .team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-note {
  border: 1px solid var(--about-rule);
  background: var(--cream);
  padding: clamp(16px, 2.4vw, 22px);
}

.page-about .about-note__label {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--vermilion);
  margin: 0 0 12px;
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: flow;
}

.page-about .about-flow li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  font-size: var(--step-index);
  line-height: 1.6;
  color: var(--text-ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-rule-soft);
}

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

.page-about .about-flow .mono {
  color: var(--gold);
  font-size: 0.72rem;
}

/* ---------- 标签 ---------- */
.page-about .labelgrid {
  margin-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .labelgrid__row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.4vw, 22px) 0;
  border-bottom: 1px solid var(--about-rule-soft);
  align-items: start;
}

.page-about .labelgrid__no {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--ink);
  color: var(--gold-lite);
  font-size: 0.72rem;
}

.page-about .labelgrid__title {
  font-size: var(--step-sub);
  margin-bottom: 6px;
  color: var(--text-ink);
}

.page-about .labelgrid__text {
  margin: 0;
  font-size: var(--step-body);
  color: var(--text-ink);
}

/* ---------- 合作生态 ---------- */
.page-about .about-sec--eco {
  background: var(--ink);
  color: var(--on-ink);
}

.page-about .about-sec--eco .about-num {
  color: var(--gold-lite);
}

.page-about .about-sec--eco .about-num::before {
  background: var(--gold);
}

.page-about .eco__lead {
  color: var(--on-ink);
  max-width: 54ch;
}

.page-about .eco {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0 clamp(20px, 3vw, 28px);
  padding-top: 26px;
  overflow-x: auto;
}

.page-about .eco__track {
  position: absolute;
  left: 6px;
  right: 6px;
  top: 32px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold) 62%, var(--vermilion-hot) 100%);
  opacity: 0.6;
}

.page-about .eco__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(96px, 1fr));
  gap: 14px;
  min-width: 400px;
}

.page-about .eco__node {
  display: grid;
  gap: 4px;
  padding-top: 18px;
  position: relative;
}

.page-about .eco__dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
}

.page-about .eco__dot--red {
  border-color: var(--vermilion-hot);
  background: var(--vermilion-hot);
}

.page-about .eco__name {
  font-size: 0.82rem;
  color: var(--gold-lite);
  letter-spacing: 0.1em;
}

.page-about .eco__desc {
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--on-ink-dim);
}

.page-about .eco__note {
  font-size: var(--step-index);
  color: var(--on-ink-dim);
  border-left: 2px solid var(--vermilion);
  padding-left: 12px;
  max-width: 60ch;
  margin: 0;
}

/* ---------- 纠错 ---------- */
.page-about .about-sec--fix {
  background: var(--cream);
}

.page-about .fix__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .fix__card {
  border: 1px solid var(--about-rule);
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--cream-2);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .fix__card:last-child {
  background: var(--ink-2);
  border-color: var(--ink-2);
}

.page-about .fix__card:last-child .fix__title {
  color: var(--cream);
}

.page-about .fix__card:last-child .fix__text {
  color: var(--on-ink);
}

.page-about .fix__title {
  font-size: var(--step-sub);
  color: var(--text-ink);
  margin: 0;
}

.page-about .fix__text {
  font-size: var(--step-index);
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

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

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

/* ---------- 收尾 ---------- */
.page-about .about-close {
  background: linear-gradient(180deg, var(--cream-2) 0%, var(--cream) 100%);
  border-top: 8px solid var(--ink);
  padding: clamp(36px, 5vw, 64px) 0;
}

.page-about .about-close__inner {
  display: grid;
  gap: 20px;
  align-items: center;
}

.page-about .about-close__line {
  font-family: var(--font-display);
  font-size: var(--step-sub);
  line-height: 1.5;
  color: var(--text-ink);
  margin: 0;
  max-width: 34ch;
}

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

@media (min-width: 860px) {
  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }
  .page-about .about-close .btn {
    justify-self: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .tl__more,
  .page-about .team__card,
  .page-about .team__list {
    transition: none;
  }
  .page-about .team__card:hover,
  .page-about .team__card:focus-within {
    transform: none;
  }
}

.page-about {
  --about-rule: rgba(217, 162, 74, 0.3);
  --about-rule-soft: rgba(217, 162, 74, 0.14);
  --about-ink-line: rgba(244, 235, 220, 0.14);
  --about-tl: clamp(26px, 4vw, 42px);
  background: var(--cream);
  color: var(--text-ink);
  font-family: var(--font-body);
  font-size: var(--step-body);
  line-height: 1.75;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  margin: 0;
  line-height: 1.2;
}

.page-about p {
  margin: 0 0 var(--stack);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ——— 章节锚点索引（仅宽屏） ——— */
.page-about .about-anchor {
  display: none;
}

@media (min-width: 1360px) {
  .page-about .about-anchor {
    display: block;
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    padding: 14px 12px;
    border-left: 2px solid var(--about-rule);
    background: rgba(244, 235, 220, 0.86);
    backdrop-filter: blur(4px);
  }
}

.page-about .about-anchor__cap {
  font-size: var(--step-index);
  color: var(--muted);
  margin: 0 0 8px;
  letter-spacing: 0.2em;
}

.page-about .about-anchor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-anchor__list a {
  display: flex;
  gap: 6px;
  align-items: baseline;
  font-size: var(--step-index);
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.page-about .about-anchor__list a:hover,
.page-about .about-anchor__list a:focus-visible {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
}

.page-about .about-anchor__list .mono {
  color: var(--gold);
  font-size: 0.72rem;
}

/* ——— 首屏 ——— */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--on-ink);
  background:
    radial-gradient(circle at 84% 16%, rgba(200, 41, 29, 0.24), transparent 46%),
    linear-gradient(180deg, var(--ink) 0%, #191410 100%);
  padding: clamp(20px, 3.6vw, 36px) 0 clamp(46px, 7vw, 92px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(217, 162, 74, 0.06) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(217, 162, 74, 0.06) 0 1px, transparent 1px 48px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-hero .breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--step-index);
}

.page-about .about-hero .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--gold);
}

.page-about .about-hero .breadcrumb__link {
  color: var(--on-ink-dim);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--gold-lite);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--gold-lite);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: stretch;
  }
}

.page-about .about-hero__title {
  font-weight: 900;
  font-size: clamp(1.9rem, 6vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--cream);
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold-lite);
  display: inline-block;
  border-bottom: 3px solid var(--vermilion);
  padding-bottom: 2px;
}

.page-about .about-hero__lead {
  max-width: 46ch;
  color: var(--on-ink);
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px solid var(--about-ink-line);
  font-size: var(--step-index);
  color: var(--on-ink-dim);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-hero__facts .mono {
  color: var(--gold-lite);
  font-size: 1rem;
  letter-spacing: 0.06em;
}

.page-about .about-hero__mark {
  display: grid;
  place-items: center;
  min-height: 220px;
  padding: clamp(18px, 3vw, 32px);
  background: var(--ink-2);
  border: 1px solid var(--about-rule);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-mark {
  width: min(70%, 220px);
  height: auto;
}

.page-about .m-frame { fill: none; stroke: var(--gold); stroke-width: 1.4; opacity: 0.45; }
.page-about .m-axis { fill: none; stroke: var(--gold); stroke-width: 1.4; opacity: 0.6; }
.page-about .m-ring { fill: none; stroke: var(--gold-lite); stroke-width: 2.6; }
.page-about .m-body { fill: none; stroke: var(--vermilion-hot); stroke-width: 2.6; }
.page-about .m-beard { fill: none; stroke: var(--gold); stroke-width: 2; }
.page-about .m-dot { fill: var(--vermilion-hot); }

/* ——— 章节骨格 ——— */
.page-about .about-sec {
  position: relative;
  padding: clamp(44px, 6vw, 88px) 0;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-row__index {
  display: none;
}

@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: 68px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-row__index {
    display: block;
  }
  .page-about .about-row--side {
    grid-template-columns: 68px minmax(0, 7fr) minmax(0, 4fr);
  }
  .page-about .about-row__side--sticky {
    position: sticky;
    top: 96px;
  }
}

.page-about .about-num {
  display: block;
  position: relative;
  padding: 10px 0 0 30px;
  font-size: var(--step-index);
  letter-spacing: 0.22em;
  color: var(--vermilion);
}

.page-about .about-num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 20px;
  height: 2px;
  background: var(--vermilion);
}

.page-about .about-sec__title {
  font-size: var(--step-chapter);
  color: var(--text-ink);
  margin-bottom: clamp(4px, 1vw, 10px);
}

.page-about .about-sec__title--onink {
  color: var(--cream);
}

.page-about .about-sec__intro {
  font-family: var(--font-mono);
  font-size: var(--step-index);
  letter-spacing: 0.02em;
  color: var(--muted);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-row__main > p:first-of-type {
  margin-top: clamp(14px, 2vw, 20px);
}

.page-about .about-row__main--narrow {
  max-width: 72ch;
}

.page-about .about-sec__tail {
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: 18px;
  border-top: 1px solid var(--about-rule-soft);
  color: var(--muted);
}

.page-about a {
  color: var(--vermilion);
  text-underline-offset: 3px;
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--vermilion-hot);
}

/* ——— 图框 ——— */
.page-about .img-frame {
  margin: 0;
  border: 1px solid var(--about-rule-soft);
  background: var(--cream-2);
  overflow: hidden;
}

.page-about .img-frame--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .img-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .img-frame__caption {
  padding: 10px 12px;
  border-top: 1px solid var(--about-rule-soft);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ——— 缘起 ——— */
.page-about .about-points {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule-soft);
  border: 1px solid var(--about-rule-soft);
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--cream);
  font-size: var(--step-index);
}

.page-about .about-points__k {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--vermilion);
  color: var(--vermilion);
  font-size: 0.8rem;
  transform: rotate(-2deg);
}

/* ——— 时间线 ——— */
.page-about .tl {
  list-style: none;
  position: relative;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0 0 0 var(--about-tl);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--vermilion) 62%, rgba(200, 41, 29, 0) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
  outline: none;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-tl) + 1px);
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--cream);
  border: 2px solid var(--vermilion);
  transform: rotate(45deg);
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--vermilion);
}

.page-about .tl__item:focus-visible {
  box-shadow: inset 0 0 0 2px var(--gold);
}

.page-about .tl__meta {
  margin: 0 0 4px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .tl__title {
  font-size: var(--step-sub);
  color: var(--text-ink);
  margin-bottom: 6px;
}

.page-about .tl__text {
  margin: 0;
  color: var(--text-ink);
}

.page-about .tl__more {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 280ms var(--ease), opacity 220ms var(--ease);
}

.page-about .tl__more > p {
  overflow: hidden;
  margin: 0;
  font-size: var(--step-index);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus-within .tl__more {
  grid-template-rows: 1fr;
  opacity: 1;
}

.page-about .tl__item:hover .tl__more > p,
.page-about .tl__item:focus-within .tl__more > p {
  padding-top: 8px;
}

/* ——— 团队 ——— */
.page-about .about-sec--team {
  background: var(--cream-2);
}

.page-about .team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 3vw, 26px);
  background: rgba(124, 111, 98, 0.28);
  border: 1px solid rgba(124, 111, 98, 0.28);
}

@media (min-width: 680px) {
  .page-about .team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .team__card {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--cream);
  outline: none;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .team__card:hover,
.page-about .team__card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 10px 26px rgba(20, 16, 14, 0.14);
}

.page-about .team__card:focus-visible {
  box-shadow: inset 0 0 0 2px var(--vermilion);
}

.page-about .team__num {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--about-rule);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .team__name {
  font-size: var(--step-sub);
  color: var(--text-ink);
  margin-bottom: 6px;
}

.page-about .team__desc {
  margin: 0;
  font-size: var(--step-index);
  color: var(--muted);
}

.page-about .team__list {
  list-style: none;
  display: grid;
  grid-template-rows: 0fr;
  gap: 6px;
  margin: 0;
  padding: 0;
  opacity: 0;
  transition: grid-template-rows 280ms var(--ease), opacity 220ms var(--ease), margin-top 280ms var(--ease);
}

.page-about .team__list > li {
  overflow: hidden;
  padding-left: 10px;
  border-left: 2px solid var(--vermilion);
  font-size: var(--step-index);
  line-height: 1.7;
}

.page-about .team__card:hover .team__list,
.page-about .team__card:focus-within .team__list {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 12px;
}

.page-about .about-flow-figure {
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-note {
  padding: clamp(16px, 2.4vw, 22px);
  border: 1px solid var(--about-rule);
  background: var(--cream);
}

.page-about .about-note__label {
  margin: 0 0 12px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--vermilion);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-flow li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-rule-soft);
  font-size: var(--step-index);
  line-height: 1.6;
}

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

.page-about .about-flow .mono {
  color: var(--gold);
  font-size: 0.72rem;
}

/* ——— 标签体系 ——— */
.page-about .labelgrid {
  margin-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .labelgrid__row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.4vw, 22px) 0;
  border-bottom: 1px solid var(--about-rule-soft);
  align-items: start;
}

.page-about .labelgrid__no {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--ink);
  color: var(--gold-lite);
  font-size: 0.72rem;
}

.page-about .labelgrid__title {
  font-size: var(--step-sub);
  margin-bottom: 6px;
  color: var(--text-ink);
}

.page-about .labelgrid__text {
  margin: 0;
  font-size: var(--step-body);
  color: var(--text-ink);
}

/* ——— 合作生态 ——— */
.page-about .about-sec--eco {
  background: var(--ink);
  color: var(--on-ink);
}

.page-about .about-sec--eco .about-num {
  color: var(--gold-lite);
}

.page-about .about-sec--eco .about-num::before {
  background: var(--gold);
}

.page-about .eco__lead {
  max-width: 54ch;
  color: var(--on-ink);
}

.page-about .eco {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0 clamp(20px, 3vw, 28px);
  padding-top: 6px;
  overflow-x: auto;
}

.page-about .eco__track {
  position: absolute;
  left: 6px;
  right: 6px;
  top: 12px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold) 60%, var(--vermilion-hot) 100%);
  opacity: 0.65;
}

.page-about .eco__nodes {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(96px, 1fr));
  gap: 14px;
  min-width: 420px;
  margin: 0;
  padding: 0;
}

.page-about .eco__node {
  position: relative;
  display: grid;
  gap: 4px;
  padding-top: 26px;
}

.page-about .eco__dot {
  position: absolute;
  top: 6px;
  left: 0;
  width: 12px;
  height: 12px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .eco__dot--red {
  background: var(--vermilion-hot);
  border-color: var(--vermilion-hot);
}

.page-about .eco__name {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--gold-lite);
}

.page-about .eco__desc {
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--on-ink-dim);
}

.page-about .eco__note {
  max-width: 60ch;
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--vermilion);
  font-size: var(--step-index);
  color: var(--on-ink-dim);
}

/* ——— 纠错 ——— */
.page-about .fix__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(20px, 3vw, 28px);
}

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

.page-about .fix__card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--about-rule);
  background: var(--cream-2);
}

.page-about .fix__card:last-child {
  background: var(--ink-2);
  border-color: var(--ink-2);
}

.page-about .fix__card:last-child .fix__title {
  color: var(--cream);
}

.page-about .fix__card:last-child .fix__text {
  color: var(--on-ink);
}

.page-about .fix__title {
  font-size: var(--step-sub);
  margin: 0;
  color: var(--text-ink);
}

.page-about .fix__text {
  margin: 0;
  font-size: var(--step-index);
  line-height: 1.7;
  color: var(--muted);
}

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

/* ——— 收尾 ——— */
.page-about .about-close {
  padding: clamp(36px, 5vw, 64px) 0;
  background: linear-gradient(180deg, var(--cream-2) 0%, var(--cream) 100%);
  border-top: 8px solid var(--ink);
}

.page-about .about-close__inner {
  display: grid;
  gap: 20px;
  align-items: center;
}

.page-about .about-close__line {
  max-width: 34ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-sub);
  line-height: 1.5;
  color: var(--text-ink);
}

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

@media (min-width: 860px) {
  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }
  .page-about .about-close .btn {
    justify-self: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .tl__more,
  .page-about .team__card,
  .page-about .team__list {
    transition: none;
  }
  .page-about .team__card:hover,
  .page-about .team__card:focus-within {
    transform: none;
  }
}

.page-about {
  --about-rule: rgba(217, 162, 74, 0.3);
  --about-rule-soft: rgba(217, 162, 74, 0.14);
  --about-ink-line: rgba(244, 235, 220, 0.14);
  --about-tl: clamp(26px, 4vw, 42px);
  background: var(--cream);
  color: var(--text-ink);
  font-family: var(--font-body);
  font-size: var(--step-body);
  line-height: 1.75;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  margin: 0;
  line-height: 1.2;
}

.page-about p {
  margin: 0 0 var(--stack);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about a {
  color: var(--vermilion);
  text-underline-offset: 3px;
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--vermilion-hot);
}

/* ——— 章节锚点索引 ——— */
.page-about .about-anchor {
  display: none;
}

@media (min-width: 1360px) {
  .page-about .about-anchor {
    display: block;
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    padding: 14px 12px;
    border-left: 2px solid var(--about-rule);
    background: rgba(244, 235, 220, 0.86);
    backdrop-filter: blur(4px);
  }
}

.page-about .about-anchor__cap {
  margin: 0 0 8px;
  font-size: var(--step-index);
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .about-anchor__list {
  list-style: none;
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
}

.page-about .about-anchor__list a {
  display: flex;
  gap: 6px;
  align-items: baseline;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  font-size: var(--step-index);
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-anchor__list a:hover,
.page-about .about-anchor__list a:focus-visible {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
}

.page-about .about-anchor__list .mono {
  color: var(--gold);
  font-size: 0.72rem;
}

/* ——— 首屏 ——— */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.6vw, 36px) 0 clamp(46px, 7vw, 92px);
  color: var(--on-ink);
  background:
    radial-gradient(circle at 84% 16%, rgba(200, 41, 29, 0.24), transparent 46%),
    linear-gradient(180deg, var(--ink) 0%, #191410 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(217, 162, 74, 0.06) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(217, 162, 74, 0.06) 0 1px, transparent 1px 48px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-hero .breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--step-index);
}

.page-about .about-hero .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--gold);
}

.page-about .about-hero .breadcrumb__link {
  color: var(--on-ink-dim);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--gold-lite);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--gold-lite);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: stretch;
  }
}

.page-about .about-hero__title {
  margin-bottom: clamp(16px, 2.4vw, 24px);
  font-weight: 900;
  font-size: clamp(1.9rem, 6vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-hero__title em {
  font-style: normal;
  display: inline-block;
  padding-bottom: 2px;
  color: var(--gold-lite);
  border-bottom: 3px solid var(--vermilion);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  color: var(--on-ink);
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px solid var(--about-ink-line);
  font-size: var(--step-index);
  color: var(--on-ink-dim);
}

.page-about .about-hero__facts li {
  display: flex;
  gap: 8px;
  align-items: baseline;
}

.page-about .about-hero__facts .mono {
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--gold-lite);
}

.page-about .about-hero__mark {
  display: grid;
  place-items: center;
  min-height: 220px;
  padding: clamp(18px, 3vw, 32px);
  border: 1px solid var(--about-rule);
  background: var(--ink-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-mark {
  width: min(70%, 220px);
  height: auto;
}

.page-about .m-frame { fill: none; stroke: var(--gold); stroke-width: 1.4; opacity: 0.45; }
.page-about .m-axis { fill: none; stroke: var(--gold); stroke-width: 1.4; opacity: 0.6; }
.page-about .m-ring { fill: none; stroke: var(--gold-lite); stroke-width: 2.6; }
.page-about .m-body { fill: none; stroke: var(--vermilion-hot); stroke-width: 2.6; }
.page-about .m-beard { fill: none; stroke: var(--gold); stroke-width: 2; }
.page-about .m-dot { fill: var(--vermilion-hot); }

/* ——— 章节骨架 ——— */
.page-about .about-sec {
  position: relative;
  padding: clamp(44px, 6vw, 88px) 0;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-row__index {
  display: none;
}

@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: 68px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-row__index {
    display: block;
  }
  .page-about .about-row--side {
    grid-template-columns: 68px minmax(0, 7fr) minmax(0, 4fr);
  }
  .page-about .about-row__side--sticky {
    position: sticky;
    top: 96px;
  }
}

.page-about .about-num {
  display: block;
  position: relative;
  padding: 10px 0 0 30px;
  font-size: var(--step-index);
  letter-spacing: 0.22em;
  color: var(--vermilion);
}

.page-about .about-num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 20px;
  height: 2px;
  background: var(--vermilion);
}

.page-about .about-sec__title {
  margin-bottom: clamp(4px, 1vw, 10px);
  font-size: var(--step-chapter);
  color: var(--text-ink);
}

.page-about .about-sec__title--onink {
  color: var(--cream);
}

.page-about .about-sec__intro {
  margin-bottom: clamp(20px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: var(--step-index);
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-row__main > p:first-of-type {
  margin-top: clamp(14px, 2vw, 20px);
}

.page-about .about-row__main--narrow {
  max-width: 72ch;
}

.page-about .about-sec__tail {
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: 18px;
  border-top: 1px solid var(--about-rule-soft);
  color: var(--muted);
}

/* ——— 图框 ——— */
.page-about .img-frame {
  margin: 0;
  border: 1px solid var(--about-rule-soft);
  background: var(--cream-2);
  overflow: hidden;
}

.page-about .img-frame--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .img-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .img-frame__caption {
  padding: 10px 12px;
  border-top: 1px solid var(--about-rule-soft);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ——— 缘起 ——— */
.page-about .about-points {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  border: 1px solid var(--about-rule-soft);
  background: var(--about-rule-soft);
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  background: var(--cream);
  font-size: var(--step-index);
}

.page-about .about-points__k {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--vermilion);
  color: var(--vermilion);
  font-size: 0.8rem;
  transform: rotate(-2deg);
}

/* ——— 时间线 ——— */
.page-about .tl {
  list-style: none;
  position: relative;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0 0 0 var(--about-tl);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--vermilion) 62%, rgba(200, 41, 29, 0) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
  outline: none;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-tl) + 1px);
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--cream);
  border: 2px solid var(--vermilion);
  transform: rotate(45deg);
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--vermilion);
}

.page-about .tl__item:focus-visible {
  box-shadow: inset 0 0 0 2px var(--gold);
}

.page-about .tl__meta {
  margin: 0 0 4px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .tl__title {
  margin-bottom: 6px;
  font-size: var(--step-sub);
  color: var(--text-ink);
}

.page-about .tl__text {
  margin: 0;
  color: var(--text-ink);
}

.page-about .tl__more {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 280ms var(--ease), opacity 220ms var(--ease);
}

.page-about .tl__more > p {
  overflow: hidden;
  margin: 0;
  font-size: var(--step-index);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus-within .tl__more {
  grid-template-rows: 1fr;
  opacity: 1;
}

.page-about .tl__item:hover .tl__more > p,
.page-about .tl__item:focus-within .tl__more > p {
  padding-top: 8px;
}

/* ——— 团队 ——— */
.page-about .about-sec--team {
  background: var(--cream-2);
}

.page-about .team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 3vw, 26px);
  border: 1px solid rgba(124, 111, 98, 0.28);
  background: rgba(124, 111, 98, 0.28);
}

@media (min-width: 680px) {
  .page-about .team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .team__card {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--cream);
  outline: none;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .team__card:hover,
.page-about .team__card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 10px 26px rgba(20, 16, 14, 0.14);
}

.page-about .team__card:focus-visible {
  box-shadow: inset 0 0 0 2px var(--vermilion);
}

.page-about .team__num {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--about-rule);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .team__name {
  margin-bottom: 6px;
  font-size: var(--step-sub);
  color: var(--text-ink);
}

.page-about .team__desc {
  margin: 0;
  font-size: var(--step-index);
  color: var(--muted);
}

.page-about .team__list {
  list-style: none;
  display: grid;
  grid-template-rows: 0fr;
  gap: 6px;
  margin: 0;
  padding: 0;
  opacity: 0;
  transition: grid-template-rows 280ms var(--ease), opacity 220ms var(--ease), margin-top 280ms var(--ease);
}

.page-about .team__list > li {
  overflow: hidden;
  padding-left: 10px;
  border-left: 2px solid var(--vermilion);
  font-size: var(--step-index);
  line-height: 1.7;
}

.page-about .team__card:hover .team__list,
.page-about .team__card:focus-within .team__list {
  grid-template-rows: 1fr;
  margin-top: 12px;
  opacity: 1;
}

.page-about .about-flow-figure {
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-note {
  padding: clamp(16px, 2.4vw, 22px);
  border: 1px solid var(--about-rule);
  background: var(--cream);
}

.page-about .about-note__label {
  margin: 0 0 12px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--vermilion);
}

.page-about .about-flow {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .about-flow li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-rule-soft);
  font-size: var(--step-index);
  line-height: 1.6;
}

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

.page-about .about-flow .mono {
  color: var(--gold);
  font-size: 0.72rem;
}

/* ——— 标签体系 ——— */
.page-about .labelgrid {
  margin-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .labelgrid__row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: clamp(16px, 2.4vw, 22px) 0;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .labelgrid__no {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--ink);
  color: var(--gold-lite);
  font-size: 0.72rem;
}

.page-about .labelgrid__title {
  margin-bottom: 6px;
  font-size: var(--step-sub);
  color: var(--text-ink);
}

.page-about .labelgrid__text {
  margin: 0;
  color: var(--text-ink);
}

/* ——— 合作生态 ——— */
.page-about .about-sec--eco {
  background: var(--ink);
  color: var(--on-ink);
}

.page-about .about-sec--eco .about-num {
  color: var(--gold-lite);
}

.page-about .about-sec--eco .about-num::before {
  background: var(--gold);
}

.page-about .eco__lead {
  max-width: 54ch;
  color: var(--on-ink);
}

.page-about .eco {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0 clamp(20px, 3vw, 28px);
  padding-top: 6px;
  overflow-x: auto;
}

.page-about .eco__track {
  position: absolute;
  left: 6px;
  right: 6px;
  top: 12px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold) 60%, var(--vermilion-hot) 100%);
  opacity: 0.65;
}

.page-about .eco__nodes {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(96px, 1fr));
  gap: 14px;
  min-width: 420px;
  margin: 0;
  padding: 0;
}

.page-about .eco__node {
  position: relative;
  display: grid;
  gap: 4px;
  padding-top: 26px;
}

.page-about .eco__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .eco__dot--red {
  border-color: var(--vermilion-hot);
  background: var(--vermilion-hot);
}

.page-about .eco__name {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--gold-lite);
}

.page-about .eco__desc {
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--on-ink-dim);
}

.page-about .eco__note {
  max-width: 60ch;
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--vermilion);
  font-size: var(--step-index);
  color: var(--on-ink-dim);
}

/* ——— 纠错 ——— */
.page-about .fix__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(20px, 3vw, 28px);
}

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

.page-about .fix__card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--about-rule);
  background: var(--cream-2);
}

.page-about .fix__card:last-child {
  border-color: var(--ink-2);
  background: var(--ink-2);
}

.page-about .fix__card:last-child .fix__title {
  color: var(--cream);
}

.page-about .fix__card:last-child .fix__text {
  color: var(--on-ink);
}

.page-about .fix__title {
  margin: 0;
  font-size: var(--step-sub);
  color: var(--text-ink);
}

.page-about .fix__text {
  margin: 0;
  font-size: var(--step-index);
  line-height: 1.7;
  color: var(--muted);
}

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

/* ——— 收尾 ——— */
.page-about .about-close {
  padding: clamp(36px, 5vw, 64px) 0;
  border-top: 8px solid var(--ink);
  background: linear-gradient(180deg, var(--cream-2) 0%, var(--cream) 100%);
}

.page-about .about-close__inner {
  display: grid;
  gap: 20px;
  align-items: center;
}

.page-about .about-close__line {
  max-width: 34ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-sub);
  line-height: 1.5;
  color: var(--text-ink);
}

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

@media (min-width: 860px) {
  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }
  .page-about .about-close .btn {
    justify-self: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .tl__more,
  .page-about .team__card,
  .page-about .team__list {
    transition: none;
  }
  .page-about .team__card:hover,
  .page-about .team__card:focus-within {
    transform: none;
  }
}