.page-about {
  --about-axis: 19px;
  --about-paper-ink: #171B26;
  --about-paper-muted: #4C5468;
  --about-paper-soft: #6A7284;
  --about-paper-line: rgba(23, 27, 38, .14);
  position: relative;
  background: var(--void);
  color: var(--silver);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .label {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--rock);
  text-transform: uppercase;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(20px, 4vw, 36px);
}

/* ---------- 首屏 ---------- */
.page-about .hero {
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-about .hero__inner {
  display: grid;
  gap: 40px;
}

.page-about .hero__eyebrow {
  margin: 0 0 16px;
}

.page-about .hero__title {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.12;
  letter-spacing: -.01em;
}

.page-about .hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(232, 236, 245, .8);
}

.page-about .hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .hero-fact {
  background: var(--night);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .hero-fact__num {
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .hero-fact__num--amber {
  color: var(--amber);
}

.page-about .hero-fact__unit {
  font-size: .52em;
  margin-left: 3px;
  color: var(--rock);
}

.page-about .hero-fact__label {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: rgba(232, 236, 245, .68);
}

@media (min-width: 1000px) {
  .page-about .hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: end;
  }
  .page-about .hero__facts {
    align-self: stretch;
    grid-template-rows: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 章节索引带 ---------- */
.page-about .chapterbar {
  border-bottom: 1px solid var(--line);
  background: rgba(14, 23, 48, .62);
}

.page-about .chapterbar__list {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .chapterbar__list::-webkit-scrollbar {
  display: none;
}

.page-about .chapterbar__link {
  display: block;
  white-space: nowrap;
  padding: 15px 14px;
  font-size: 13.5px;
  letter-spacing: .04em;
  color: rgba(232, 236, 245, .6);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .chapterbar__link .mono {
  margin-right: 7px;
  font-size: 11.5px;
  color: var(--cyan-deep);
}

.page-about .chapterbar__link:hover {
  color: var(--silver);
}

.page-about .chapterbar__link[data-active] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .chapterbar__link[data-active] .mono {
  color: var(--cyan);
}

/* ---------- 分区通用 ---------- */
.page-about .section {
  padding: clamp(48px, 8vw, 96px) 0;
  border-top: none;
}

.page-about .section-head {
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .section-head__title {
  margin: 12px 0 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.2;
  letter-spacing: -.005em;
}

.page-about .section-head__desc {
  margin: 0;
  max-width: 42em;
  font-size: clamp(14.5px, 1.5vw, 16px);
  line-height: 1.85;
  color: rgba(232, 236, 245, .72);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-shell {
  position: relative;
  overflow: hidden;
  padding-top: 8px;
}

.page-about .timeline-shell__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  z-index: 0;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 28%, #000 72%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 28%, #000 72%, transparent);
}

.page-about .timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--about-axis);
  top: 6px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg,
      rgba(79, 227, 208, 0) 0%,
      rgba(79, 227, 208, .55) 6%,
      rgba(79, 227, 208, .28) 58%,
      rgba(233, 162, 59, .4) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 52px;
  padding-bottom: 44px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--void);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(79, 227, 208, .09);
}

.page-about .tl-item:nth-child(2)::before {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(233, 162, 59, .1);
}

.page-about .tl-item:nth-child(3)::before {
  border-color: var(--moss);
  box-shadow: 0 0 0 4px rgba(126, 143, 99, .12);
}

.page-about .tl-year {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .tl-card {
  border: 1px solid var(--line);
  background: rgba(14, 23, 48, .76);
  padding: 20px 18px 22px;
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .tl-card:hover {
  border-color: rgba(79, 227, 208, .38);
  background: rgba(14, 23, 48, .92);
}

.page-about .tl-card__title {
  margin: 12px 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.4;
}

.page-about .tl-card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(232, 236, 245, .76);
}

.page-about .tl-result {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--moss);
}

.page-about .tl-result .mono {
  margin-right: 8px;
  color: var(--moss);
  font-weight: 700;
}

@media (min-width: 900px) {
  .page-about {
    --about-axis: 152px;
  }
  .page-about .tl-item {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr);
    column-gap: 44px;
    padding-left: 0;
    padding-bottom: 56px;
  }
  .page-about .tl-item::before {
    left: 146px;
    top: 9px;
  }
  .page-about .tl-year {
    grid-column: 1;
    text-align: right;
    margin: 4px 0 0;
  }
  .page-about .tl-card {
    grid-column: 2;
    padding: 24px 26px 26px;
  }
}

/* ---------- 并轨说明 ---------- */
.page-about .split {
  display: grid;
  gap: 32px;
}

.page-about .split__body p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(232, 236, 245, .78);
}

.page-about .split__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 227, 208, .4);
}

.page-about .split__body a:hover {
  color: var(--silver);
  border-bottom-color: var(--silver);
}

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

.page-about .split__media img {
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .check-list {
  list-style: none;
  margin: 4px 0 22px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .check-list__item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(232, 236, 245, .8);
}

.page-about .check-list__key {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--amber);
  padding-top: 3px;
}

@media (min-width: 960px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 团队分工 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 32px;
}

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

.page-about .team-card {
  background: var(--night);
  padding: 22px 20px 24px;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 8px;
  align-content: start;
}

.page-about .team-card__num {
  grid-row: 1 / span 2;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--moss);
}

.page-about .team-card__role {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16.5px;
  line-height: 1.4;
}

.page-about .team-card__task {
  margin: 0;
  grid-column: 2;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(232, 236, 245, .72);
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure img {
  border: 1px solid var(--line);
  object-fit: cover;
}

@media (min-width: 960px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 米白纸面区 ---------- */
.page-about .paper-zone {
  position: relative;
  background: var(--paper);
  color: var(--about-paper-ink);
  padding: clamp(20px, 3vw, 40px) 0 clamp(48px, 7vw, 88px);
}

.page-about .paper-zone::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 88px;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(23, 27, 38, .08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 27, 38, .08) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent);
  mask-image: linear-gradient(180deg, #000, transparent);
}

.page-about .psec {
  position: relative;
  padding: clamp(32px, 5vw, 60px) 0;
}

.page-about .psec + .psec {
  border-top: 1px solid var(--about-paper-line);
}

.page-about .psec .label {
  color: #8A6A22;
}

.page-about .psec .section-head__title {
  color: var(--about-paper-ink);
  font-size: clamp(22px, 3.2vw, 34px);
}

.page-about .psec .section-head__desc {
  color: var(--about-paper-muted);
}

.page-about .psec p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-paper-muted);
}

.page-about .psec a {
  color: #1E6F68;
  text-decoration: none;
  border-bottom: 1px solid rgba(30, 111, 104, .38);
}

.page-about .psec a:hover {
  color: var(--about-paper-ink);
  border-bottom-color: var(--about-paper-ink);
}

.page-about .net-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
  margin: 4px 0 30px;
}

.page-about .net-fig {
  background: var(--paper);
  padding: 20px 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .net-fig__num {
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--about-paper-ink);
}

.page-about .net-fig__cap {
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--about-paper-soft);
}

.page-about .net-body p {
  margin: 0 0 16px;
  max-width: 44em;
}

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

.page-about .net-body__tail {
  margin: 30px 0 0;
  max-width: 44em;
  padding-top: 20px;
  border-top: 1px solid var(--about-paper-line);
}

/* ---------- 赛季轨道 ---------- */
.page-about .season-track {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
}

.page-about .season-step {
  background: var(--paper);
  padding: 20px 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .season-step__no {
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--clay);
}

.page-about .season-step h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
  color: var(--about-paper-ink);
}

.page-about .season-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1px;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
  margin: 4px 0 26px;
}

.page-about .eco-card {
  background: var(--paper);
  padding: 22px 20px 24px;
}

.page-about .eco-card__num {
  display: block;
  font-size: clamp(28px, 3.8vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--about-paper-ink);
}

.page-about .eco-card__cap {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--about-paper-soft);
}

.page-about .eco-card__desc {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
}

.page-about .eco-note {
  margin: 0;
  max-width: 46em;
  padding-top: 20px;
  border-top: 1px solid var(--about-paper-line);
}

@media (min-width: 720px) {
  .page-about .net-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .season-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 收尾 ---------- */
.page-about .close-band {
  padding: clamp(48px, 7vw, 84px) 0 clamp(56px, 8vw, 96px);
  background: var(--void);
}

.page-about .close-band__inner {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .close-band__text {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(19px, 2.6vw, 28px);
  line-height: 1.5;
}

.page-about .close-band__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .close-band__links {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  padding-top: 20px;
  margin-top: 4px;
  border-top: 1px solid var(--line);
}

.page-about .close-band__links a {
  font-size: 14px;
  letter-spacing: .03em;
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .close-band__links a:hover {
  color: var(--cyan);
  border-bottom-color: rgba(79, 227, 208, .5);
}

@media (min-width: 820px) {
  .page-about .close-band__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 24px 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .chapterbar__link,
  .page-about .close-band__links a {
    transition: none;
  }
}
</main>