.page-about {
  --about-line: rgba(140, 154, 147, 0.22);
  --about-line-soft: rgba(140, 154, 147, 0.12);
  --about-gap: clamp(20px, 4vw, 32px);
  color: var(--bone);
  padding-bottom: clamp(64px, 10vw, 120px);
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏声明 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(32px, 7vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  color: var(--bone);
}

.page-about .about-hero__lead {
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(242, 239, 230, 0.8);
  margin: 18px 0 0;
  max-width: 38em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__panel {
  padding: 20px 22px;
  border: 1px solid var(--about-line);
  clip-path: var(--cut-corner);
}

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

.page-about .about-figures li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 13px;
  border-bottom: 1px dashed var(--about-line);
}

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

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  line-height: 1;
  color: var(--lime);
  min-width: 66px;
  flex: none;
}

.page-about .about-figures__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(242, 239, 230, 0.76);
}

/* ---------- 主体：索引 + 章节 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(32px, 6vw, 64px);
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .about-toc {
  border-top: 1px solid var(--about-line);
  padding-top: 14px;
}

.page-about .about-toc__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--stone);
  margin: 0 0 12px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--about-line);
  font-size: 13px;
  color: rgba(242, 239, 230, 0.74);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

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

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--bone);
  border-color: rgba(198, 255, 0, 0.55);
  background: rgba(198, 255, 0, 0.07);
}

.page-about .about-toc__link:hover .about-toc__num,
.page-about .about-toc__link:focus-visible .about-toc__num {
  color: var(--lime);
}

.page-about .about-toc__foot {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
  margin: 14px 0 0;
}

.page-about .about-toc__foot a {
  color: var(--lime-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 0, 0.3);
}

.page-about .about-content {
  min-width: 0;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(56px, 9vw, 96px);
}

.page-about .about-chapter__head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(52px, 12vw, 96px);
  line-height: 0.82;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(198, 255, 0, 0.55);
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  color: var(--bone);
}

.page-about .about-chapter__lead {
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(242, 239, 230, 0.76);
  margin: 12px 0 0;
  max-width: 38em;
}

/* ---------- 01 三类内容 ---------- */
.page-about .about-intro {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .about-domain {
  background: var(--moss);
  padding: 20px;
  border-top: 2px solid rgba(140, 154, 147, 0.5);
  clip-path: var(--cut-corner);
}

.page-about .about-domain:first-child {
  border-top-color: var(--lime);
}

.page-about .about-domain:nth-child(2) {
  border-top-color: var(--ember);
}

.page-about .about-domain:nth-child(3) {
  border-top-color: var(--clay);
}

.page-about .about-domain__name {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.01em;
  margin: 0 0 8px;
  color: var(--bone);
}

.page-about .about-domain__text {
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.8);
  margin: 0;
}

.page-about .about-domain__meta {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

/* 图片容器 */
.page-about .media-frame {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-line);
  clip-path: var(--cut-corner);
  background: var(--ink-deeper);
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.06);
}

.page-about .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--stone);
  padding: 10px 12px;
  border-top: 1px solid var(--about-line-soft);
}

/* ---------- 02 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-step {
  border-top: 2px solid rgba(140, 154, 147, 0.35);
  padding-top: 16px;
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-step__title {
  font-family: var(--font-display);
  font-size: 19px;
  margin: 8px 0 8px;
  color: var(--bone);
}

.page-about .about-step__text {
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.76);
  margin: 0;
}

.page-about .about-step__out {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 4px 9px;
  color: var(--lime-soft);
  border: 1px solid rgba(198, 255, 0, 0.38);
}

.page-about .about-quote {
  margin: 34px 0 0;
  padding: 6px 0 6px 20px;
  border-left: 3px solid var(--clay);
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 25px);
  line-height: 1.5;
  color: var(--bone);
}

.page-about .about-flowmedia {
  margin-top: clamp(28px, 4vw, 40px);
}

/* ---------- 03 团队 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 16px;
}

.page-about .about-role {
  background: var(--glass);
  border: 1px solid var(--about-line);
  padding: 5px;
  clip-path: var(--cut-corner);
}

.page-about .about-role__body {
  background: var(--ink-deeper);
  padding: 20px;
  transition: transform 0.26s var(--ease);
}

.page-about .about-role:hover .about-role__body,
.page-about .about-role:focus-within .about-role__body {
  transform: translateY(-6px);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-role__name {
  font-family: var(--font-display);
  font-size: 20px;
  margin: 0;
  color: var(--bone);
}

.page-about .about-role__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-role__text {
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.78);
  margin: 14px 0 0;
}

/* ---------- 04 节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
}

.page-about .about-rhythm__item {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-rhythm__item:first-child {
  border-top: 2px solid rgba(198, 255, 0, 0.4);
}

.page-about .about-rhythm__phase {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .about-rhythm__title {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--bone);
}

.page-about .about-rhythm__text {
  font-size: 14.5px;
  line-height: 1.74;
  color: rgba(242, 239, 230, 0.76);
  margin: 0;
  max-width: 40em;
}

.page-about .about-versions {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  padding: 18px 20px;
  background: rgba(198, 255, 0, 0.05);
  border-left: 2px solid var(--lime);
}

.page-about .about-versions__item {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(242, 239, 230, 0.82);
}

.page-about .about-versions__key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--lime);
  min-width: 84px;
  flex: none;
}

/* ---------- 05 覆盖与合作 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 18px;
}

.page-about .about-coverage__cell {
  border-top: 2px solid rgba(140, 154, 147, 0.4);
  padding-top: 14px;
}

.page-about .about-coverage__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 48px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-coverage__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(242, 239, 230, 0.72);
}

.page-about .about-coop {
  margin-top: 26px;
}

.page-about .disclosure {
  border: 1px solid var(--about-line);
  background: var(--glass);
  clip-path: var(--cut-corner);
}

.page-about .disclosure + .disclosure {
  margin-top: 12px;
}

.page-about .disclosure__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--bone);
}

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

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

.page-about .disclosure__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--lime);
  margin-left: auto;
}

.page-about .disclosure[open] .disclosure__summary::after {
  content: "–";
}

.page-about .disclosure__summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -4px;
}

.page-about .disclosure__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--about-line-soft);
  font-size: 14px;
  line-height: 1.74;
  color: rgba(242, 239, 230, 0.78);
}

.page-about .disclosure__body ul {
  margin: 14px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-wide {
  margin-top: clamp(28px, 4vw, 40px);
}

/* ---------- 继续浏览 ---------- */
.page-about .about-next {
  margin-top: clamp(56px, 9vw, 96px);
  padding-top: 26px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-next__head {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 26px);
  margin: 0;
  color: var(--bone);
}

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  border: 1px solid var(--about-line);
  text-decoration: none;
  color: var(--bone);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: rgba(198, 255, 0, 0.55);
  background: rgba(198, 255, 0, 0.06);
  transform: translateY(-3px);
}

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

.page-about .about-next__label {
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--lime-soft);
}

.page-about .about-next__desc {
  font-size: 13px;
  line-height: 1.62;
  color: rgba(242, 239, 230, 0.66);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-domains {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    padding-top: 46px;
    position: relative;
  }

  .page-about .about-flow::before {
    content: "";
    position: absolute;
    top: 22px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
      90deg,
      rgba(198, 255, 0, 0.06),
      rgba(198, 255, 0, 0.42) 10%,
      rgba(198, 255, 0, 0.42) 90%,
      rgba(198, 255, 0, 0.06)
    );
  }

  .page-about .about-step {
    position: relative;
    padding-right: 10px;
  }

  .page-about .about-step::before {
    content: "";
    position: absolute;
    top: -28px;
    left: 0;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--lime);
    box-shadow: 0 0 0 4px rgba(198, 255, 0, 0.12);
  }

  .page-about .about-rhythm__item {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
    padding: 24px 0;
  }

  .page-about .about-versions__item {
    flex-wrap: nowrap;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr);
  }

  .page-about .about-intro {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    padding-top: 36px;
  }

  .page-about .about-roles > :nth-child(2) {
    margin-top: -30px;
  }

  .page-about .about-roles > :nth-child(3) {
    margin-top: 16px;
  }

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

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
  }

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

  .page-about .about-toc__link {
    width: 100%;
    border: 0;
    border-left: 2px solid var(--about-line);
    padding: 10px 12px;
    white-space: normal;
    line-height: 1.4;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-left-color: var(--lime);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role__body,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .about-role:hover .about-role__body,
  .page-about .about-next__link:hover {
    transform: none;
  }
}