.page-about {
  background: var(--cream);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 3.4vw, 42px) 0 clamp(30px, 5vw, 62px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
  align-items: end;
}

.page-about .about-hero h1 {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
  max-width: 19ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 2px solid var(--ink);
}

/* ---------- 通用指标块（本页作用域） ---------- */
.page-about .stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .stat-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 2.7vw, 32px);
  line-height: 1;
  color: var(--milan);
  min-width: 3.4ch;
  letter-spacing: -0.01em;
}

.page-about .stat-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gray);
  text-transform: uppercase;
}

/* ---------- 通栏横幅 ---------- */
.page-about .about-banner__fig {
  margin: 0 0 clamp(36px, 6vw, 86px);
}

.page-about .about-banner__media {
  aspect-ratio: 14 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(140deg, var(--paper) 0%, var(--cream) 70%);
}

.page-about .about-banner__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-banner__fig .media__cap {
  margin-top: 12px;
}

/* ---------- 时间轴分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.4vw, 58px);
}

.page-about .about-intro {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-split__side {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .side-media {
  margin: 0;
}

.page-about .side-media__frame {
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--paper);
}

.page-about .side-media__frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .side-media .media__cap {
  margin-top: 10px;
}

.page-about .side-note {
  margin: 0;
  padding: 14px 16px;
  border-left: 3px solid var(--ember);
  background: var(--paper);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--gray);
  font-family: var(--font-mono);
}

/* ---------- 时间轴主体 ---------- */
.page-about .phase-list {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .phase-list::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--milan) 0%, var(--line) 60%, transparent 100%);
  opacity: 0.7;
}

.page-about .phase {
  position: relative;
  padding-left: 50px;
  padding-bottom: clamp(30px, 4.2vw, 54px);
}

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

.page-about .phase__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--cream);
  border: 1px solid var(--milan);
  color: var(--milan);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
}

.page-about .phase__title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin: 4px 0 10px;
}

.page-about .phase__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .phase__arc {
  display: block;
  width: 70px;
  height: 35px;
  margin: 16px 0 14px 2px;
  border: 1px solid var(--line);
  border-top: 0;
  border-right: 0;
  border-radius: 0 0 0 35px;
}

.page-about .phase__fold {
  margin-top: 2px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .phase__fold > summary {
  cursor: pointer;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--milan);
  list-style: none;
}

.page-about .phase__fold > summary::-webkit-details-marker {
  display: none;
}

.page-about .phase__fold > summary::before {
  content: "+ ";
  font-weight: 700;
}

.page-about .phase__fold[open] > summary::before {
  content: "− ";
}

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

.page-about .phase__dims li {
  display: flex;
  gap: 14px;
  padding: 9px 0;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .phase__dims li:first-child {
  border-top: 0;
}

.page-about .phase__dims b {
  flex: none;
  min-width: 3ch;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ember);
}

.page-about .more-wrap {
  margin: 18px 0 0;
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .team-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ember);
  border-radius: var(--radius-sm);
  transition: border-left-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .team-card:hover {
  border-left-color: var(--milan);
  transform: translateX(3px);
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--milan);
}

.page-about .team-card__name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
}

.page-about .team-card__size {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .team-card__desc {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 流程 ---------- */
.page-about .flow-media {
  margin: clamp(22px, 3vw, 34px) 0 clamp(26px, 3.6vw, 42px);
}

.page-about .flow-media__frame {
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(160deg, var(--paper) 0%, var(--cream) 80%);
}

.page-about .flow-media__frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .flow-media .media__cap {
  margin-top: 10px;
}

.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px;
  background: var(--paper);
}

.page-about .flow-step__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--milan);
}

.page-about .flow-step__name {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
}

.page-about .flow-step__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 栏目沿革 ---------- */
.page-about .ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ledger__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ledger__key {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .ledger__val {
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 对外协作 ---------- */
.page-about .about-collab {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-collab__cta {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .about-collab__facts {
  align-content: start;
  padding: clamp(20px, 3vw, 30px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
}

.page-about .about-collab__facts .stat:last-of-type {
  border-bottom: 0;
}

.page-about .about-collab__note {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 长期做法（深色色带） ---------- */
.page-about .pledge-band {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.4vw, 56px);
  background: var(--ink);
  color: var(--cream);
  border-radius: var(--radius);
}

.page-about .pledge-band::after {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 190px;
  height: 190px;
  border-top: 1px solid rgba(228, 87, 46, 0.55);
  border-left: 1px solid rgba(228, 87, 46, 0.55);
  border-radius: 190px 0 0 0;
  pointer-events: none;
}

.page-about .pledge-band .eyebrow {
  color: var(--amber);
}

.page-about .pledge-band .sec-title {
  color: var(--cream);
}

.page-about .pledge-list {
  list-style: none;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 2.6vw, 30px);
}

.page-about .pledge__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .pledge__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.45;
  color: var(--cream);
}

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

.page-about .pledge__more {
  margin: clamp(22px, 3.2vw, 32px) 0 0;
}

.page-about .pledge-band .more {
  color: var(--amber);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }

  .page-about .ledger__row {
    grid-template-columns: minmax(180px, 220px) 1fr;
    gap: 36px;
    align-items: baseline;
  }

  .page-about .flow-step {
    grid-template-columns: 84px minmax(120px, 160px) 1fr;
    gap: 24px;
    align-items: start;
    padding: 22px 24px;
  }

  .page-about .flow-step__name {
    font-size: 17px;
  }

  .page-about .pledge-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
  }
}

@media (min-width: 1000px) {
  .page-about .about-split {
    grid-template-columns: 8fr 4fr;
    align-items: start;
  }

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

  .page-about .team-split {
    grid-template-columns: 6fr 6fr;
    align-items: start;
  }

  .page-about .about-collab {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}