.page-about {
  --era-rail-w: 148px;
  --slant: 28px;
}

/* ---------- 首屏：非对称斜切分屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 6.2vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 1.1rem;
  color: var(--ink);
  max-width: 18ch;
}

.page-about .about-hero__copy .lead {
  max-width: 60ch;
  color: var(--ink-2);
}

.page-about .about-hero__board {
  position: relative;
  padding: 1.5rem 1.35rem 1.75rem;
  background: linear-gradient(158deg, var(--green-900) 0%, var(--carbon) 72%);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--slant)), calc(100% - var(--slant)) 100%, 0 100%);
}

.page-about .about-hero__board::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--signal), transparent 70%);
  opacity: 0.85;
}

.page-about .about-hero__board-label {
  margin: 0 0 1rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

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

.page-about .round-scale__item {
  position: relative;
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 0.9rem;
  align-items: baseline;
  padding: 0.7rem 0 0.7rem 1rem;
  border-left: 1px solid var(--line);
}

.page-about .round-scale__item::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 1.05rem;
  width: 5px;
  height: 5px;
  background: var(--ink-2);
  transform: rotate(45deg);
}

.page-about .round-scale__item.is-current {
  border-left-color: var(--signal);
}

.page-about .round-scale__item.is-current::before {
  background: var(--signal);
}

.page-about .round-scale__num {
  font-size: 0.86rem;
  color: var(--ink-2);
}

.page-about .round-scale__item.is-current .round-scale__num {
  color: var(--signal);
}

.page-about .round-scale__txt {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--ink);
}

/* ---------- 赛季档案 ---------- */
.page-about .about-archive {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-archive__head {
  max-width: 66ch;
}

.page-about .about-archive__media {
  margin: 2rem 0 clamp(2.25rem, 5vw, 3.5rem);
}

.page-about .era-layout {
  display: grid;
  gap: 2rem;
}

.page-about .era-rail {
  align-self: start;
}

.page-about .era-rail__label {
  margin: 0 0 0.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.page-about .era-rail__list {
  display: flex;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0 0 0.4rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .era-rail__link {
  display: inline-flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.55rem 0.85rem;
  min-width: max-content;
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--ink-2);
  font-size: 0.82rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-about .era-rail__link .mono {
  color: var(--ink);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.page-about .era-rail__link:hover,
.page-about .era-rail__link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--glass-strong);
  outline: none;
}

.page-about .era {
  padding: clamp(1.75rem, 4vw, 2.75rem) 0;
  border-top: 1px solid var(--line);
}

.page-about .era:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .era__year {
  margin: 0 0 0.4rem;
  font-size: 1.6rem;
  color: var(--signal);
  letter-spacing: 0.02em;
}

.page-about .era__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  line-height: 1.2;
  color: var(--ink);
}

.page-about .era p {
  margin: 0 0 0.9rem;
  max-width: 68ch;
  color: var(--ink-2);
  line-height: 1.85;
}

.page-about .era__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.1rem;
}

.page-about .era--current {
  background: linear-gradient(140deg, var(--green-900), var(--carbon) 78%);
  border-top-color: var(--signal);
  padding-inline: clamp(1.1rem, 3vw, 1.75rem);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--slant)), calc(100% - var(--slant)) 100%, 0 100%);
}

.page-about .about-archive__stats {
  margin-top: 1.4rem;
}

/* ---------- 团队职能标签页 ---------- */
.page-about .about-team {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: linear-gradient(180deg, var(--carbon), var(--green-900) 140%);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team__head {
  max-width: 68ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-team__tabs {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.page-about .tabs__btn {
  appearance: none;
  cursor: pointer;
  padding: 0.55rem 1rem;
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--ink-2);
  font-family: var(--font-body);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .tabs__btn:hover,
.page-about .tabs__btn:focus-visible {
  color: var(--ink);
  border-color: var(--cyan);
  outline: none;
}

.page-about .tabs__btn[aria-selected="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--carbon);
  font-weight: 700;
}

.page-about .tabs__panel {
  background: var(--glass);
  border-left: 2px solid var(--green-700);
  padding: clamp(1.25rem, 3.5vw, 2rem);
}

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

.page-about .about-team__role {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3.4vw, 1.5rem);
  color: var(--ink);
}

.page-about .tabs__panel > p {
  margin: 0 0 1.2rem;
  max-width: 70ch;
  color: var(--ink-2);
  line-height: 1.85;
}

/* ---------- 内容生产流程 ---------- */
.page-about .about-flow {
  padding-block: clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-flow__head {
  max-width: 64ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .flow-layout {
  display: grid;
  gap: 2rem;
}

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

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

.page-about .flow-step {
  position: relative;
  padding: 0 0 1.6rem 3.4rem;
  border-left: 1px solid var(--line);
  margin-left: 0.75rem;
}

.page-about .flow-step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .flow-step__num {
  position: absolute;
  left: -0.75rem;
  top: 0;
  width: 2.1rem;
  height: 2.1rem;
  display: grid;
  place-items: center;
  background: var(--carbon);
  border: 1px solid var(--green-700);
  color: var(--cyan);
  font-size: 0.78rem;
  transform: rotate(45deg);
}

.page-about .flow-step__num::before {
  content: "";
}

.page-about .flow-step__num {
  color: var(--cyan);
}

.page-about .flow-step:nth-child(2) .flow-step__num {
  color: var(--ink);
  border-color: var(--line);
}

.page-about .flow-step__title {
  margin: 0.2rem 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ink);
}

.page-about .flow-step p {
  margin: 0;
  max-width: 62ch;
  color: var(--ink-2);
  line-height: 1.85;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: var(--green-900);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-eco__head {
  max-width: 70ch;
}

.page-about .about-eco__filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 1.75rem;
}

.page-about .about-eco__count {
  margin-left: auto;
  font-size: 0.82rem;
  color: var(--ink-2);
}

.page-about .about-eco__count strong {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 1rem;
}

.page-about .eco-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
}

.page-about .eco-card {
  background: var(--green-700);
  padding: clamp(1.15rem, 3vw, 1.6rem);
  transition: background 0.25s ease;
}

.page-about .eco-card:hover {
  background: var(--green-900);
}

.page-about .eco-card[hidden] {
  display: none;
}

.page-about .eco-card__key {
  margin: 0 0 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--earth);
}

.page-about .eco-card__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  color: var(--ink);
}

.page-about .eco-card p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .about-eco__honor {
  margin-top: 1.75rem;
  padding: 1.25rem 1.4rem;
  border-left: 3px solid var(--gold);
  background: var(--glass);
}

.page-about .about-eco__honor-key {
  margin: 0 0 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-eco__honor-text {
  margin: 0;
  max-width: 70ch;
  color: var(--ink-2);
  line-height: 1.85;
}

.page-about .about-eco__honor-text strong {
  color: var(--gold);
}

/* ---------- 云南运营 ---------- */
.page-about .about-yunnan {
  position: relative;
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background:
    linear-gradient(200deg, rgba(180, 85, 47, 0.28), transparent 58%),
    var(--carbon);
}

.page-about .about-yunnan__inner {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-about .about-yunnan__copy p {
  margin: 0 0 1rem;
  max-width: 64ch;
  color: var(--ink-2);
  line-height: 1.85;
}

.page-about .about-yunnan__copy .section__title {
  margin-bottom: 1rem;
}

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

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding-block: clamp(2.75rem, 6vw, 4.5rem);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.5rem;
  align-items: end;
}

.page-about .about-cta__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.2vw, 2.2rem);
  line-height: 1.18;
  color: var(--ink);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 62ch;
  color: var(--ink-2);
  line-height: 1.85;
}

.page-about .about-cta .to-top {
  margin-top: 2rem;
}

/* ---------- 画面宽度适配 ---------- */
@media (min-width: 640px) {
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .page-about .era-layout {
    grid-template-columns: var(--era-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .era-rail {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about .era-rail__list {
    flex-direction: column;
    gap: 0.4rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .era-rail__link {
    width: 100%;
  }

  .page-about .flow-layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .about-yunnan__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2.5rem;
  }
}

@media (min-width: 1120px) {
  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .era-rail__link,
  .page-about .tabs__btn,
  .page-about .eco-card {
    transition: none;
  }
}
<<<END>>>