.page-about {
  padding-top: var(--head-space);
  background: var(--deep);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: 8px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 56px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: -12%;
  width: 52%;
  height: 130%;
  background: linear-gradient(155deg, var(--turf-deep) 0%, rgba(21, 122, 56, 0) 68%);
  transform: skewX(-6deg);
  opacity: .38;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-hero__rail {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
  border-left: 2px solid var(--turf);
  padding-left: 12px;
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__rail-num {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--turf);
  letter-spacing: 0;
}

.page-about .about-hero__rail-label {
  color: var(--white);
}

.page-about .about-hero__rail-note {
  color: var(--mist);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-3xl);
  line-height: 1.1;
  letter-spacing: -0.01em;
  max-width: 18em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 44ch;
  font-size: var(--fs-md);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--arena);
  padding: 15px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
  border: 0;
}

.page-about .about-stat__unit {
  margin-left: 3px;
  font-size: var(--fs-sm);
  color: var(--turf);
}

.page-about .about-stat__label {
  font-size: var(--fs-xs);
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-sec {
  position: relative;
  padding: 48px 0;
}

.page-about .about-sec--edge {
  background: linear-gradient(180deg, rgba(16, 35, 67, .72) 0%, rgba(6, 13, 28, 0) 100%);
}

.page-about .about-sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.page-about .about-rail__num {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--turf);
  letter-spacing: 0;
}

.page-about .about-rail__label {
  color: var(--mist);
}

.page-about .about-sec h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-2xl);
  line-height: 1.16;
  letter-spacing: -0.005em;
}

.page-about .about-lead {
  margin: 0 0 8px;
  max-width: 58ch;
  font-size: var(--fs-md);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-text p {
  margin: 0 0 16px;
  max-width: 60ch;
  line-height: 1.9;
  color: var(--mist);
}

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

.page-about .about-note {
  margin: 26px 0 0;
  max-width: 62ch;
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-note a {
  color: var(--turf);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-note a:hover {
  color: var(--white);
}

.page-about .about-lead a {
  color: var(--turf);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-lead a:hover {
  color: var(--white);
}

/* ---------- 分栏与图片 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-figure {
  margin: 0;
  position: relative;
  background: var(--arena);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 58px;
  height: 4px;
  background: var(--turf);
  transform: skewX(-24deg);
}

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

.page-about .about-figure__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--edge);
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-figure--wide {
  margin-top: 28px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 22px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--turf) 0%, var(--edge) 100%);
}

.page-about .about-node {
  position: relative;
  margin-bottom: 14px;
}

.page-about .about-node:last-child {
  margin-bottom: 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--turf);
  box-shadow: 0 0 0 4px var(--deep);
}

.page-about .about-node__det {
  border: 1px solid var(--edge);
  border-radius: 14px;
  background: var(--arena);
  overflow: hidden;
  transition: border-color .2s var(--ease);
}

.page-about .about-node__det[open] {
  border-color: var(--turf-deep);
}

.page-about .about-node__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 16px;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__year {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--turf);
  letter-spacing: .06em;
}

.page-about .about-node__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-md);
  color: var(--white);
}

.page-about .about-node__body {
  padding: 0 16px 16px;
  margin: 0 16px;
  border-top: 1px solid var(--edge);
  padding-top: 12px;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-node__body p {
  margin: 0;
}

.page-about .about-mark {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}

.page-about .about-mark::before,
.page-about .about-mark::after {
  content: "";
  position: absolute;
  background: var(--turf);
  transition: transform .22s var(--ease);
}

.page-about .about-mark::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 2px;
}

.page-about .about-mark::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-about details[open] .about-mark::after {
  transform: scaleY(0);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-role {
  position: relative;
  padding: 18px 20px 20px;
  background: var(--arena);
  border: 1px solid var(--edge);
  border-radius: 14px;
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-role:hover {
  transform: translateY(-2px);
  border-color: var(--turf-deep);
}

.page-about .about-role__key {
  display: inline-block;
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .14em;
  color: var(--signal);
  border: 1px solid rgba(255, 106, 26, .38);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  margin-bottom: 10px;
}

.page-about .about-role h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-lg);
  color: var(--white);
}

.page-about .about-role p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-role--wide {
  background: linear-gradient(140deg, var(--turf-deep) 0%, var(--arena) 68%);
  border-color: var(--turf-deep);
}

.page-about .about-role--wide .about-role__key {
  color: var(--white);
  border-color: rgba(255, 255, 255, .45);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-metrics {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-metric {
  position: relative;
  padding: 20px 22px;
  background: var(--arena);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
}

.page-about .about-metric::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 3px;
  border-radius: 3px;
  background: var(--turf);
}

.page-about .about-metric--signal::before {
  background: var(--signal);
}

.page-about .about-metric__num {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-2xl);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-metric__unit {
  margin-left: 6px;
  font-size: var(--fs-md);
  color: var(--turf);
}

.page-about .about-metric--signal .about-metric__unit {
  color: var(--signal-soft);
}

.page-about .about-metric__title {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-md);
  color: var(--white);
}

.page-about .about-metric p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-checks {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-checks li {
  background: var(--arena);
  padding: 18px 20px;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  column-gap: 14px;
}

.page-about .about-checks__num {
  grid-row: 1 / 3;
  font-family: var(--font-data);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--turf);
  line-height: 1.2;
}

.page-about .about-checks h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-md);
  color: var(--white);
}

.page-about .about-checks p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 赛季阶段 ---------- */
.page-about .about-phases {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-phase {
  background: var(--arena);
  border: 1px solid var(--edge);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color .2s var(--ease);
}

.page-about .about-phase[open] {
  border-color: var(--turf-deep);
}

.page-about .about-phase__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 14px;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-phase__idx {
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--turf);
}

.page-about .about-phase__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-lg);
  color: var(--white);
}

.page-about .about-phase__body {
  margin: 0 18px 18px;
  padding-top: 13px;
  border-top: 1px solid var(--edge);
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-phase__body p {
  margin: 0;
}

/* ---------- 合作生态与积累 ---------- */
.page-about .about-eco {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-eco li {
  background: var(--arena);
  padding: 18px 20px;
}

.page-about .about-eco__key {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .14em;
  color: var(--turf);
}

.page-about .about-eco h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-md);
  color: var(--white);
}

.page-about .about-eco p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-badges {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-badges li {
  padding: 8px 14px;
  border: 1px dashed var(--edge);
  border-radius: 4px;
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .06em;
  color: var(--mist);
  background: rgba(16, 35, 67, .6);
}

.page-about .about-badges li:first-child {
  border-color: var(--turf-deep);
  color: var(--white);
}

/* ---------- 联系渠道 ---------- */
.page-about .about-banner {
  margin: 0 0 26px;
  position: relative;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--arena);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: clamp(170px, 29vw, 300px);
  object-fit: cover;
}

.page-about .about-banner__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  background: rgba(6, 13, 28, .82);
  border-top: 1px solid var(--edge);
  border-right: 1px solid var(--edge);
  border-top-right-radius: 10px;
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--turf);
}

.page-about .about-contact {
  margin-top: 26px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-contact__col {
  background: var(--arena);
  padding: 16px 18px;
}

.page-about .about-contact__key {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  letter-spacing: .14em;
  color: var(--turf);
}

.page-about .about-contact__col p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--white);
  word-break: break-word;
}

.page-about .about-cta {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-metrics,
  .page-about .about-eco,
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-sec {
    padding: 64px 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-hero__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    height: 100%;
  }

  .page-about .about-hero__rail-label {
    writing-mode: vertical-rl;
    letter-spacing: .32em;
  }

  .page-about .about-sec__grid {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 46px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--head-space) + 14px);
    flex-direction: column;
    align-items: flex-start;
    align-self: start;
    gap: 12px;
    padding-left: 14px;
    border-left: 1px solid var(--edge);
  }

  .page-about .about-rail__label {
    writing-mode: vertical-rl;
    letter-spacing: .3em;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .88fr);
    gap: 38px;
    align-items: start;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-role--wide {
    grid-column: 1 / -1;
  }

  /* 时间线左右交替 */
  .page-about .about-timeline {
    padding-left: 0;
    margin-top: 34px;
  }

  .page-about .about-timeline::before {
    left: 50%;
    top: 6px;
    bottom: 6px;
  }

  .page-about .about-node {
    width: calc(50% - 28px);
    margin-bottom: 18px;
  }

  .page-about .about-node::before {
    top: 24px;
  }

  .page-about .about-node:nth-child(odd)::before {
    left: auto;
    right: -32px;
  }

  .page-about .about-node:nth-child(even) {
    margin-left: calc(50% + 28px);
  }

  .page-about .about-node:nth-child(even)::before {
    left: -32px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero h1 {
    font-size: var(--fs-3xl);
  }

  .page-about .about-sec__grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-mark::before,
  .page-about .about-mark::after {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}