.page-about {
  --about-gap: clamp(22px, 3vw, 46px);
  --about-section-space: clamp(52px, 8vw, 104px);
}

.page-about .page-content {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(26px, 5vw, 64px) var(--gutter) clamp(60px, 9vw, 120px);
  overflow-wrap: break-word;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 10px;
  margin: 0 0 clamp(28px, 4vw, 52px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about .breadcrumb__item {
  color: var(--stone);
  text-decoration: none;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 10px;
  color: var(--line);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: 0;
  background-image: radial-gradient(700px 420px at 6% -12%, rgba(43, 227, 200, 0.1), transparent 72%);
  background-repeat: no-repeat;
}

.page-about .kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero .display-title {
  margin: 12px 0 clamp(18px, 3vw, 30px);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.2rem, 7.2vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 14em;
}

.page-about .lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.95;
  color: var(--mist);
}

/* ---------- 左侧章节索引 ---------- */
.page-about .about-index {
  display: none;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .about-index__cap {
  display: block;
  padding-bottom: 12px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--line);
  color: var(--stone);
  letter-spacing: 0.2em;
}

.page-about .about-index__link {
  display: block;
  padding: 8px 0 8px 10px;
  border-left: 1px solid var(--line);
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms linear, border-left-color 160ms linear;
}

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

/* ---------- 媒体容器 ---------- */
.page-about .media-frame {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: var(--board);
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--board);
}

.page-about .media-frame__caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .about-hero__media .media-frame__img {
  aspect-ratio: 6 / 7;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-top: var(--about-section-space);
  padding-top: clamp(38px, 5.5vw, 68px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 84px;
}

.page-about .about-section .section-head {
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.page-about .about-section h2.display-title,
.page-about .about-community h2.display-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.75rem, 4.6vw, 3.2rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 22em;
}

/* ---------- 01 每天在做的事 ---------- */
.page-about .about-daily__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-daily__pull {
  margin: 0;
  padding-left: 18px;
  border-left: 2px solid var(--clay);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.25rem, 2.6vw, 1.9rem);
  line-height: 1.4;
  color: var(--clay);
}

.page-about .about-daily__body p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-daily__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(30px, 4.4vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line);
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-facts__num {
  flex: 0 0 auto;
  min-width: 3.8em;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  line-height: 1.2;
  color: var(--cyan);
}

/* ---------- 02 三支小队 ---------- */
.page-about .about-lead {
  margin: 0 0 clamp(26px, 4vw, 44px);
  font-size: 15px;
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 40px);
}

.page-about .about-team {
  padding-top: 18px;
  border-top: 2px solid var(--line);
}

.page-about .about-team:nth-child(1) {
  border-top-color: var(--cyan);
}

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

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

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

.page-about .about-team h3 {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.2rem, 2.4vw, 1.65rem);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-team p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-team__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

/* ---------- 03 流程步骤 ---------- */
.page-about .about-flow {
  margin-top: clamp(24px, 3.6vw, 44px);
}

.page-about .about-flow .tab-list {
  display: flex;
  min-width: 0;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-flow .tab {
  flex: 1 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 18px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 160ms linear, color 160ms linear;
}

.page-about .about-flow .tab:last-child {
  border-right: 0;
}

.page-about .about-flow .tab:hover {
  color: var(--paper);
}

.page-about .about-flow .tab.is-active {
  background: rgba(43, 227, 200, 0.1);
  color: var(--paper);
}

.page-about .about-flow .tab__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--stone);
}

.page-about .about-flow .tab.is-active .tab__num {
  color: var(--cyan);
}

.page-about .about-flow .tab-panel {
  display: none;
  padding: clamp(22px, 3.4vw, 38px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow .tab-panel.is-active {
  display: block;
}

.page-about .about-flow .tab-panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-flow .tab-panel p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-flow__media {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .about-flow__media .media-frame__img {
  aspect-ratio: 14 / 9;
}

/* ---------- 04 版本演进 ---------- */
.page-about .about-versions-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-versions {
  --v-pad: clamp(18px, 2.6vw, 30px);
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--v-pad);
  border-left: 1px solid var(--line);
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
}

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

.page-about .about-version::before {
  content: "";
  position: absolute;
  top: 12px;
  left: calc(-1 * var(--v-pad) - 4px);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--stone);
  transition: background-color 200ms linear, box-shadow 200ms linear;
}

.page-about .about-version[data-open]::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(43, 227, 200, 0.14);
}

.page-about .about-version .expandable__trigger {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

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

.page-about .about-version__name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.15rem, 2.3vw, 1.5rem);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-version__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-version .expandable__panel {
  display: none;
  padding-top: 10px;
}

.page-about .about-version[data-open] .expandable__panel {
  display: block;
}

.page-about .about-version .expandable__panel p {
  margin: 0 0 14px;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mist);
}

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

.page-about .about-version__cap li {
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

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

.page-about .about-versions__media .media-frame__img {
  aspect-ratio: 5 / 6;
}

/* ---------- 05 社群共建 ---------- */
.page-about .about-community {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding: clamp(26px, 4.4vw, 56px);
  background: var(--turf);
  border: 1px solid var(--line);
}

.page-about .about-community h2.display-title {
  margin: 10px 0 clamp(16px, 2.4vw, 26px);
  font-size: clamp(1.65rem, 4vw, 2.7rem);
  max-width: 20em;
}

.page-about .about-community__text p {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-community__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-community__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 16px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-community__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-community__unit {
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-community__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 06 长期跟队 ---------- */
.page-about .about-commit {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 28px);
  padding-left: clamp(18px, 2.6vw, 30px);
  border-left: 2px solid var(--clay);
}

.page-about .about-commit p {
  margin: 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 46px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 800px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-facts li {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 22px 24px 22px 0;
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .about-facts li:last-child {
    padding-right: 0;
    border-right: 0;
  }

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

@media (min-width: 880px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-team:nth-child(2) {
    margin-top: clamp(22px, 3.6vw, 52px);
  }

  .page-about .about-team:nth-child(3) {
    margin-top: clamp(8px, 1.6vw, 22px);
  }
}

@media (min-width: 900px) {
  .page-about .about-daily__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.4fr);
    gap: clamp(30px, 5vw, 84px);
    align-items: start;
  }

  .page-about .about-community {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.5fr);
    gap: clamp(30px, 5vw, 72px);
    align-items: start;
  }

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

@media (min-width: 980px) {
  .page-about .about-versions-wrap {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    gap: clamp(32px, 5vw, 80px);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: 152px minmax(0, 1.15fr) minmax(0, 0.7fr);
    gap: clamp(24px, 3.4vw, 64px);
    align-items: start;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: clamp(24px, 5vh, 64px);
  }

  .page-about .about-hero__media {
    margin-top: clamp(0px, 3vw, 40px);
  }
}

@media (max-width: 560px) {
  .page-about .about-cta .btn {
    flex: 1 1 100%;
    text-align: center;
  }

  .page-about .about-flow .tab {
    padding: 13px 14px;
    font-size: 13px;
  }
}