.page-about {
  --about-accent: var(--orange);
}

.page-about .about-crumb {
  padding-top: 18px;
}

/* ============ 页首 ============ */

.page-about .about-head {
  padding-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-head__inner {
  padding-top: clamp(20px, 4vw, 44px);
  max-width: 940px;
}

.page-about .about-head__tag {
  display: inline-block;
  margin: 0 0 18px;
}

.page-about .about-head__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(29px, 6.6vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--cool);
  margin: 0 0 20px;
  max-width: 16em;
  text-wrap: balance;
}

.page-about .about-head__lede {
  color: var(--dim);
  font-size: clamp(15.5px, 1.7vw, 18px);
  line-height: 1.82;
  max-width: 46em;
  margin: 0;
}

.page-about .about-head__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  background: var(--line);
}

.page-about .about-head__fact {
  background: var(--hull-deep);
  padding: 15px 16px 17px;
}

.page-about .about-head__fact dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--dim-2);
  margin: 0 0 9px;
}

.page-about .about-head__fact dd {
  margin: 0;
  color: var(--cool);
  display: flex;
  align-items: baseline;
  gap: 5px;
  flex-wrap: wrap;
}

.page-about .about-fact__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .about-fact__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.page-about .about-head__media {
  margin-top: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

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

/* ============ 通用分节 ============ */

.page-about .section {
  padding-block: clamp(44px, 7.5vw, 88px);
}

.page-about .about-teams__head,
.page-about .about-flow__head,
.page-about .about-season__head,
.page-about .about-cover__head,
.page-about .about-tools__head {
  max-width: 46em;
  margin-bottom: clamp(26px, 4vw, 44px);
}

/* ============ 筛选条 ============ */

.page-about .about-teams__filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 6px;
}

.page-about .about-teams__filter .filter-bar__label {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--dim-2);
  margin-right: 4px;
}

.page-about .about-teams__filter .filter-btn {
  appearance: none;
  -webkit-appearance: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--dim);
  background: transparent;
  border: 1px solid var(--line);
  padding: 7px 14px;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-teams__filter .filter-btn:hover,
.page-about .about-teams__filter .filter-btn:focus-visible {
  color: var(--cool);
  border-color: var(--line-strong);
}

.page-about .about-teams__filter .filter-btn.is-active {
  color: var(--sea);
  background: var(--orange);
  border-color: var(--orange);
  font-weight: 700;
}

.page-about .about-teams__filter .filter-bar__meta {
  margin-left: auto;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--dim-2);
}

/* ============ 团队分工 ============ */

.page-about .about-roles {
  display: block;
}

.page-about .role-row {
  display: grid;
  gap: 14px;
  padding: 28px 0 32px;
  border-bottom: 1px solid var(--hair);
}

.page-about .role-row[hidden] {
  display: none;
}

.page-about .role-row__scale {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .role-row__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(50px, 11vw, 76px);
  line-height: 0.86;
  letter-spacing: -0.04em;
  color: var(--orange);
  display: block;
}

.page-about .role-row__unit {
  display: block;
  margin-top: 10px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--dim-2);
}

.page-about .role-row__scale::after {
  content: "";
  display: block;
  height: 11px;
  margin-top: 12px;
  width: min(210px, 100%);
  background-image: repeating-linear-gradient(to right, var(--line-strong) 0 1px, transparent 1px 11px);
}

.page-about .role-row__body {
  min-width: 0;
}

.page-about .role-row__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 3.2vw, 27px);
  line-height: 1.34;
  color: var(--cool);
  margin: 0 0 10px;
}

.page-about .role-row__body p {
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.82;
  margin: 0 0 16px;
  max-width: 52em;
}

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

@media (min-width: 860px) {
  .page-about .role-row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 12px 44px;
    align-items: start;
    padding: 36px 0 42px;
  }
}

/* ============ 三道工序 ============ */

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

.page-about .flow-step {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 0 16px;
}

.page-about .flow-step__rail {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .flow-step__rail::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
  background: var(--line);
}

.page-about .flow-step:last-child .flow-step__rail::before {
  bottom: auto;
  height: 20px;
}

.page-about .flow-step__dot {
  position: relative;
  z-index: 1;
  width: 13px;
  height: 13px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--hull);
  border: 1px solid var(--line-strong);
  flex: none;
}

.page-about .flow-step--p1 .flow-step__dot {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 106, 31, 0.15);
}

.page-about .flow-step--p2 .flow-step__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(52, 226, 210, 0.13);
}

.page-about .flow-step--p3 .flow-step__dot {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 0 5px rgba(255, 194, 75, 0.13);
}

.page-about .flow-step__body {
  min-width: 0;
  padding-bottom: clamp(28px, 4vw, 46px);
  margin-bottom: clamp(20px, 3vw, 34px);
  border-bottom: 1px solid var(--hair);
}

.page-about .flow-step:last-child .flow-step__body {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 0;
}

.page-about .flow-step__idx {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--dim-2);
}

.page-about .flow-step--p1 .flow-step__idx { color: var(--orange); }
.page-about .flow-step--p2 .flow-step__idx { color: var(--cyan); }
.page-about .flow-step--p3 .flow-step__idx { color: var(--amber); }

.page-about .flow-step__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 31px);
  line-height: 1.28;
  color: var(--cool);
  margin: 0 0 12px;
}

.page-about .flow-step__text {
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.84;
  margin: 0;
  max-width: 50em;
}

.page-about .flow-step__metric {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin: 18px 0 0;
  padding: 9px 15px;
  border: 1px solid var(--line);
  background: var(--hull-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dim-2);
}

.page-about .flow-step__metric b {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .flow-step--p1 .flow-step__metric b { color: var(--orange); }
.page-about .flow-step--p2 .flow-step__metric b { color: var(--cyan); }
.page-about .flow-step--p3 .flow-step__metric b { color: var(--amber); }

.page-about .about-flow__figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

@media (min-width: 900px) {
  .page-about .about-flow__figure {
    width: 62%;
    margin-left: auto;
  }
}

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

/* ============ 赛季节奏 ============ */

.page-about .about-season__figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .season-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .season-stage {
  position: relative;
  background: var(--hull);
  padding: 26px 20px 30px;
  min-width: 0;
}

.page-about .season-stage::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--orange);
  opacity: 0.26;
}

.page-about .season-stage:nth-child(2)::before { opacity: 0.5; }
.page-about .season-stage:nth-child(3)::before { opacity: 0.74; }
.page-about .season-stage:nth-child(4)::before { opacity: 1; }

.page-about .season-stage__idx {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--dim-2);
  margin-bottom: 12px;
}

.page-about .season-stage__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 23px);
  color: var(--cool);
  margin: 0 0 10px;
}

.page-about .season-stage__text {
  margin: 0;
  color: var(--dim);
  font-size: 14.5px;
  line-height: 1.78;
}

@media (min-width: 760px) {
  .page-about .season-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ============ 覆盖范围 ============ */

.page-about .cover-nums {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hair);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .cover-num {
  background: var(--sea);
  padding: 24px 20px 28px;
  min-width: 0;
}

.page-about .cover-num__value {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(42px, 8vw, 62px);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--cyan);
}

.page-about .cover-num__label {
  display: block;
  margin-top: 10px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--dim-2);
}

.page-about .cover-num__text {
  margin: 14px 0 0;
  color: var(--dim);
  font-size: 14.5px;
  line-height: 1.78;
}

@media (min-width: 780px) {
  .page-about .cover-nums {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .cover-audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: clamp(30px, 4.5vw, 48px);
  border-top: 1px solid var(--line);
}

.page-about .audience-item {
  padding: 24px 0 26px;
  border-bottom: 1px solid var(--hair);
  min-width: 0;
}

.page-about .audience-item__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 21px);
  color: var(--cool);
  margin: 0 0 10px;
}

.page-about .audience-item__text {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.8;
  max-width: 34em;
}

@media (min-width: 820px) {
  .page-about .cover-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 34px;
  }
}

/* ============ 自建工具 ============ */

.page-about .tool-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--line);
}

.page-about .tool-card {
  position: relative;
  background: var(--hull-deep);
  padding: 26px 22px 30px;
  min-width: 0;
}

.page-about .tool-card__idx {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--orange);
  margin-bottom: 14px;
}

.page-about .tool-card__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 23px);
  color: var(--cool);
  margin: 0 0 12px;
}

.page-about .tool-card__text {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.82;
}

@media (min-width: 780px) {
  .page-about .tool-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ============ 加入与协作 ============ */

.page-about .join-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: clamp(26px, 4vw, 44px);
  background: var(--hull);
  border: 1px solid var(--line-strong);
  box-shadow: 6px 6px 0 rgba(6, 23, 38, 0.55);
}

@media (min-width: 900px) {
  .page-about .join-panel {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }
}

.page-about .join-panel__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 33px);
  line-height: 1.28;
  color: var(--cool);
  margin: 16px 0 14px;
}

.page-about .join-panel__text {
  margin: 0;
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.82;
  max-width: 30em;
}

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

.page-about .join-list__item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hair);
}

@media (min-width: 640px) {
  .page-about .join-list__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-about .join-list__label {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--dim-2);
}

.page-about .join-list__value {
  color: var(--cool);
  font-size: 14.5px;
  line-height: 1.7;
  word-break: break-word;
}

.page-about .join-panel__note {
  margin: 18px 0 0;
  color: var(--dim-2);
  font-size: 13.5px;
  line-height: 1.75;
}

.page-about .join-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
}

.page-about .about-cross {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--hair);
  color: var(--dim-2);
  font-size: 14px;
  line-height: 1.9;
}

.page-about .about-cross__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 226, 210, 0.4);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-cross__link:hover,
.page-about .about-cross__link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ============ 显现动效 ============ */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}
<<<END>>>