.page-about {
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 34px) 0 clamp(36px, 6vw, 68px);
  background: linear-gradient(180deg, var(--c-rampart) 0%, var(--c-ink) 68%);
  color: var(--on-dark);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-hero .breadcrumb__link {
  color: var(--on-dark-dim);
}

.page-about .about-hero .breadcrumb__link[aria-current="page"] {
  color: var(--on-dark);
}

.page-about .about-hero .breadcrumb__sep {
  color: var(--on-dark-faint);
}

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

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--c-flame);
}

.page-about .about-hero__title {
  margin: 0;
  color: var(--on-dark);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 3vw, 26px) 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--on-dark-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .about-facts__item {
  min-width: 0;
  padding: 14px 12px 16px;
  background-color: var(--c-ink);
}

.page-about .about-facts__value {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-ember);
}

.page-about .about-facts__unit {
  margin-left: 3px;
  font-size: clamp(10px, 1.5vw, 12px);
  letter-spacing: 0;
  color: var(--on-dark-dim);
}

.page-about .about-facts__label {
  display: block;
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--on-dark-faint);
}

.page-about .about-hero__figure {
  margin: clamp(28px, 5vw, 52px) 0 0;
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__figure .media-frame__img {
  aspect-ratio: 12 / 7;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
}

.page-about .section--dark .chapter-band__title {
  color: var(--on-dark);
}

.page-about .section--dark .chapter-band__note {
  color: var(--on-dark-dim);
}

/* ---------- 01 平台在做什么 ---------- */
.page-about .about-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  margin-top: clamp(22px, 4vw, 36px);
}

.page-about .about-specs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--line-light);
  border: 1px solid var(--line-light);
  align-self: start;
}

.page-about .about-specs__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px 16px;
  background-color: var(--c-paper);
}

.page-about .about-specs__k {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-mid);
}

.page-about .about-specs__v {
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-ink);
}

.page-about .about-specs__v.mono {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
}

@media (min-width: 900px) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }
}

/* ---------- 02 四条内容线 ---------- */
.page-about .about-lineup {
  list-style: none;
  margin: clamp(22px, 4vw, 36px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
}

.page-about .about-lineup__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-lineup__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-flame);
  line-height: 1.6;
}

.page-about .about-lineup__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.5;
}

.page-about .about-lineup__desc {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-body);
  max-width: 62ch;
}

@media (min-width: 820px) {
  .page-about .about-lineup__item {
    grid-template-columns: 46px minmax(150px, 210px) minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 24px;
  }

  .page-about .about-lineup__desc {
    grid-column: 3;
  }
}

.page-about .about-note {
  margin-top: clamp(24px, 4vw, 40px);
  padding: 18px 20px 20px 22px;
  border-left: 3px solid var(--c-flame);
  background-color: var(--wash-flame);
}

.page-about .about-note__title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-note__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-body);
  max-width: 74ch;
}

/* ---------- 03 团队与分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(22px, 4vw, 36px);
  align-items: start;
}

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

.page-about .about-team__figure .media-frame__img {
  aspect-ratio: 5 / 3;
}

.page-about .about-team__total {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin: 0 0 16px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--c-flame);
}

.page-about .about-team__total-num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 6vw, 50px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-about .about-team__total-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-mid);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 6px 18px;
  padding: 15px 0 17px 14px;
  border-bottom: 1px solid var(--line-light);
  border-left: 2px solid transparent;
  outline: none;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-team__row:hover,
.page-about .about-team__row:focus-visible {
  border-left-color: var(--c-flame);
  background-color: var(--wash-flame);
}

.page-about .about-team__role {
  grid-column: 1;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-team__count {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--c-flame);
}

.page-about .about-team__duty {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-body);
}

@media (min-width: 960px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-team__figure {
    position: sticky;
    top: calc(var(--header-lower-h) + 24px);
  }
}

/* ---------- 04 比赛日工作流 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  max-width: 78ch;
}

.page-about .about-flow__step {
  position: relative;
  padding: 0 0 28px 30px;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 0;
  width: 1px;
  background-color: var(--line-dark);
}

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

.page-about .about-flow__step:last-child::before {
  bottom: 60%;
}

.page-about .about-flow__step::after {
  content: "";
  position: absolute;
  left: -3px;
  top: 6px;
  width: 7px;
  height: 7px;
  background-color: var(--c-ink);
  border: 1px solid var(--c-flame);
}

.page-about .about-flow__time {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-ember);
}

.page-about .about-flow__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--on-dark);
}

.page-about .about-flow__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--on-dark-dim);
}

/* ---------- 05 发展历程 ---------- */
.page-about .about-history__lede {
  margin: clamp(22px, 4vw, 34px) 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--ink-body);
  max-width: 60ch;
}

.page-about .about-history {
  margin-top: clamp(22px, 4vw, 34px);
  border-top: 1px solid var(--line-light);
}

.page-about .about-history__item {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-history__summary {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 12px;
  padding: 15px 2px 15px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-history__summary::marker {
  content: "";
}

.page-about .about-history__summary:hover .about-history__name {
  color: var(--c-flame);
}

.page-about .about-history__summary:focus-visible {
  outline: 2px solid var(--c-flame);
  outline-offset: 2px;
}

.page-about .about-history__ver {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-flame);
}

.page-about .about-history__name {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-ink);
  transition: color var(--dur) var(--ease);
}

.page-about .about-history__mark {
  text-align: center;
  font-size: 16px;
  line-height: 1;
  color: var(--c-mid);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-history__item[open] .about-history__mark {
  transform: rotate(45deg);
  color: var(--c-flame);
}

.page-about .about-history__body {
  padding: 0 0 20px;
}

.page-about .about-history__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-body);
  max-width: 66ch;
}

@media (min-width: 720px) {
  .page-about .about-history__body {
    padding-left: 54px;
  }
}

.page-about .about-history__figure {
  margin: clamp(28px, 5vw, 48px) 0 0;
}

.page-about .about-history__figure .media-frame__img {
  aspect-ratio: 2 / 1;
}

/* ---------- 06 协作与资质 ---------- */
.page-about .about-trust {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(22px, 4vw, 36px);
}

.page-about .about-trust__block {
  padding-top: 16px;
  border-top: 2px solid var(--c-brick);
}

.page-about .about-trust__block:nth-child(2) {
  border-top-color: var(--c-flame);
}

.page-about .about-trust__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-trust__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-body);
  max-width: 52ch;
}

@media (min-width: 860px) {
  .page-about .about-trust {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(28px, 4vw, 56px);
  }
}

/* ---------- 07 使用路径 ---------- */
.page-about .about-paths {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 28px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-path {
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--c-brick);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-path:hover {
  border-left-color: var(--c-flame);
}

.page-about .about-path__index {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-flame);
}

.page-about .about-path__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-path__desc {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-body);
}

@media (min-width: 880px) {
  .page-about .about-paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: clamp(24px, 3vw, 40px);
  }

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

  .page-about .about-path:nth-child(3) {
    margin-top: 60px;
  }
}

/* ---------- 结尾联络 ---------- */
.page-about .about-cta {
  padding: clamp(36px, 6vw, 72px) 0;
  background-color: var(--c-ink);
  border-top: 3px solid var(--c-flame);
  color: var(--on-dark);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  color: var(--on-dark);
  max-width: 22ch;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-dark-dim);
  max-width: 58ch;
}

@media (min-width: 820px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(28px, 4vw, 56px);
  }
}