.page-about {
  --about-body: #3A423F;
  --about-rail-w: 208px;
  background: var(--paper);
  color: var(--char);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 52px;
  background:
    radial-gradient(120% 150% at 8% 0%, rgba(91, 242, 206, .12) 0%, transparent 56%),
    radial-gradient(90% 120% at 96% 100%, rgba(30, 83, 67, .55) 0%, transparent 62%),
    var(--ink-900);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(241, 240, 234, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(241, 240, 234, .05) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 82%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 16px;
}

.page-about .about-hero .breadcrumb,
.page-about .about-hero .breadcrumb__list {
  color: rgba(241, 240, 234, .58);
}

.page-about .about-hero .breadcrumb__item,
.page-about .about-hero .breadcrumb__item a,
.page-about .about-hero .breadcrumb__sep {
  color: rgba(241, 240, 234, .58);
}

.page-about .about-hero .breadcrumb__item a:hover {
  color: var(--cyan);
}

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

.page-about .about-hero__title {
  margin: 0;
  max-width: 17ch;
  font-size: clamp(32px, 6.2vw, 72px);
  font-weight: 260;
  line-height: 1.08;
  letter-spacing: -.022em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 4px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.95;
  color: rgba(241, 240, 234, .78);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 14px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid rgba(241, 240, 234, .16);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 18px 20px;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-fact__unit {
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(241, 240, 234, .58);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding: 44px 0 72px;
}

.page-about .about-layout {
  align-items: start;
  gap: 34px;
}

/* ---------- 左侧赛季编年 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail__label {
  color: var(--ink-500);
}

.page-about .about-timeline {
  list-style: none;
  margin: 16px 0 0;
  padding: 0 0 0 20px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--ink-500) 0%, rgba(30, 83, 67, .2) 100%);
}

.page-about .about-tl {
  position: relative;
  margin-bottom: 2px;
}

.page-about .about-tl__link {
  display: grid;
  gap: 2px;
  padding: 9px 6px 10px 0;
  color: inherit;
  text-decoration: none;
  border-radius: 2px;
}

.page-about .about-tl__dot {
  position: absolute;
  left: -20px;
  top: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--ink-500);
  transition: background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease);
}

.page-about .about-tl--now .about-tl__dot {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-tl:hover .about-tl__dot,
.page-about .about-tl:focus-within .about-tl__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(91, 242, 206, .26);
}

.page-about .about-tl__link:focus-visible {
  outline: 2px solid var(--ink-500);
  outline-offset: 2px;
}

.page-about .about-tl__year {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--char);
}

.page-about .about-tl__tag {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-tl__tip {
  position: absolute;
  left: 0;
  top: calc(100% - 4px);
  z-index: 8;
  width: min(212px, 62vw);
  margin: 0;
  padding: 10px 12px;
  background: var(--ink-900);
  color: rgba(241, 240, 234, .86);
  font-size: 12px;
  line-height: 1.7;
  border-left: 2px solid var(--cyan);
  box-shadow: var(--shadow-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-5px);
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease),
              transform var(--dur-fast) var(--ease),
              visibility var(--dur-fast) linear;
}

.page-about .about-tl:hover .about-tl__tip,
.page-about .about-tl:focus-within .about-tl__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 右侧面板堆叠 ---------- */
.page-about .about-panels {
  display: grid;
  gap: 42px;
  min-width: 0;
}

.page-about .about-panel {
  position: relative;
  padding-top: 24px;
  border-top: 1px solid var(--hair);
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 48px;
  height: 2px;
  background: var(--ink-500);
}

.page-about .about-panel__index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-panel__title {
  margin: 0 0 12px;
  font-size: clamp(23px, 3.1vw, 33px);
  font-weight: 600;
  line-height: 1.26;
  letter-spacing: -.012em;
  color: var(--char);
}

.page-about .about-panel__lead {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-body);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.page-about .about-role {
  display: grid;
  align-content: start;
  gap: 7px;
  padding: 18px 18px 22px;
  background: var(--card);
}

.page-about .about-role__count {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink-500);
}

.page-about .about-role__unit {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-role__name {
  margin: 2px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--char);
}

.page-about .about-role__duty {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-body);
}

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

/* ---------- 四个环节 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
  background: var(--hair);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .about-step {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 22px 20px 26px;
  background: var(--paper);
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .about-step__name {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  color: var(--char);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--about-body);
}

.page-about .about-flow__media {
  margin: 26px 0 0;
}

/* ---------- 业务演进 ---------- */
.page-about .about-evo {
  display: grid;
}

.page-about .about-evo__row {
  display: grid;
  gap: 6px 22px;
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-evo__row:first-child {
  border-top: 1px solid var(--hair);
}

.page-about .about-evo__season {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ink-500);
}

.page-about .about-evo__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--char);
}

.page-about .about-evo__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--about-body);
}

.page-about .about-evo__media {
  margin: 28px 0 0;
  max-width: 340px;
}

.page-about .about-evo__foot {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-evo__foot a {
  color: var(--ink-500);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-evo__foot a:hover {
  color: var(--char);
}

/* ---------- 编辑标准 ---------- */
.page-about .about-spec {
  margin: 0;
  display: grid;
}

.page-about .about-spec__row {
  display: grid;
  gap: 5px 24px;
  padding: 17px 0 19px;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-spec__row:first-child {
  border-top: 1px solid var(--hair);
}

.page-about .about-spec dt {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink-500);
}

.page-about .about-spec dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--about-body);
}

/* ---------- 工具 ---------- */
.page-about .about-tools {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.page-about .about-tool {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 20px 20px 24px;
  background: var(--ink-900);
  box-shadow: var(--shadow-1);
}

.page-about .about-tool__name {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-tool__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: rgba(241, 240, 234, .78);
}

/* ---------- 共建伙伴 ---------- */
.page-about .about-ptags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .about-ptag {
  display: inline-block;
  padding: 6px 11px;
  border: 1px solid var(--ink-500);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--ink-500);
}

.page-about .about-partners__prose p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.92;
  color: var(--about-body);
}

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

/* ---------- 一起做资料 ---------- */
.page-about .about-panel--cta {
  padding: 30px 24px 34px;
  border-top-color: transparent;
  background:
    radial-gradient(120% 160% at 100% 0%, rgba(91, 242, 206, .14) 0%, transparent 58%),
    var(--ink-900);
  color: var(--paper);
}

.page-about .about-panel--cta::before {
  display: none;
}

.page-about .about-panel--cta .about-panel__index {
  color: var(--cyan);
}

.page-about .about-panel--cta .about-panel__title {
  color: var(--paper);
}

.page-about .about-panel--cta .about-panel__lead {
  color: rgba(241, 240, 234, .78);
}

.page-about .about-join__list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.page-about .about-join__item {
  padding-top: 14px;
  border-top: 1px solid rgba(241, 240, 234, .18);
}

.page-about .about-join__name {
  margin: 0 0 7px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-join__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: rgba(241, 240, 234, .76);
}

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

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

/* ---------- 显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-base) var(--ease),
              transform var(--dur-base) var(--ease);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-evo__row {
    grid-template-columns: 104px minmax(0, 1fr);
  }

  .page-about .about-spec__row {
    grid-template-columns: 168px minmax(0, 1fr);
  }

  .page-about .about-panel--cta {
    padding: 36px 34px 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 46px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 128px;
    padding-top: 26px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .about-hero {
    padding: 40px 0 62px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-panels {
    gap: 52px;
  }
}

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

  .page-about .about-tl__tip,
  .page-about .about-tl__dot {
    transition: none;
  }
}