.page-about {
  --about-idx: clamp(52px, 7vw, 104px);
  --about-line: rgba(27, 74, 58, 0.55);
  color: var(--white);
  font-family: var(--font-body);
  padding-bottom: calc(var(--dock-h) + 40px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(16px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

.page-about .breadcrumb__item:last-child {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 3.5vw, 40px) clamp(36px, 6vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--about-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-line) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: radial-gradient(125% 95% at 42% 0%, #000 0%, transparent 70%);
  mask-image: radial-gradient(125% 95% at 42% 0%, #000 0%, transparent 70%);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-lede {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 50ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding-top: clamp(16px, 2.4vw, 22px);
  border-top: 1px solid var(--line);
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
  min-width: 0;
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1;
  color: var(--white);
}

.page-about .about-facts__unit {
  margin-left: 3px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  color: var(--lime);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--bg-deep);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05) brightness(0.85);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  display: grid;
  gap: 12px;
  padding-block: clamp(36px, 5.5vw, 78px);
  border-top: 1px solid var(--line);
}

.page-about .about-idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
  opacity: 0.9;
}

.page-about .about-idx::after {
  content: "";
  display: block;
  width: 1px;
  height: clamp(18px, 3vw, 34px);
  margin-top: 10px;
  background: linear-gradient(to bottom, var(--lime), transparent);
}

.page-about .about-block__main {
  min-width: 0;
}

.page-about .about-block h2 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-quad {
  list-style: none;
  margin: clamp(24px, 3.5vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-quad li {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-quad h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-quad p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .history {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .stages {
  min-width: 0;
}

.page-about .stage-radio,
.page-about .role-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .stage-bar,
.page-about .role-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .stage-pill,
.page-about .role-pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .stage-pill:hover,
.page-about .role-pill:hover {
  color: var(--white);
  border-color: var(--lime);
}

.page-about .stages:focus-within .stage-bar,
.page-about .roles:focus-within .role-bar {
  outline: 1px dashed var(--lime);
  outline-offset: 6px;
  border-radius: var(--radius-sm);
}

.page-about #stage-all:checked ~ .stage-bar .stage-pill[for="stage-all"],
.page-about #stage-start:checked ~ .stage-bar .stage-pill[for="stage-start"],
.page-about #stage-mobile:checked ~ .stage-bar .stage-pill[for="stage-mobile"],
.page-about #stage-squad:checked ~ .stage-bar .stage-pill[for="stage-squad"],
.page-about #stage-now:checked ~ .stage-bar .stage-pill[for="stage-now"],
.page-about #role-sched:checked ~ .role-bar .role-pill[for="role-sched"],
.page-about #role-squad:checked ~ .role-bar .role-pill[for="role-squad"],
.page-about #role-review:checked ~ .role-bar .role-pill[for="role-review"],
.page-about #role-ops:checked ~ .role-bar .role-pill[for="role-ops"] {
  background: var(--lime);
  border-color: var(--lime);
  color: #061512;
}

.page-about #stage-start:checked ~ .timeline .tl-item:not(.tl-item--start),
.page-about #stage-mobile:checked ~ .timeline .tl-item:not(.tl-item--mobile),
.page-about #stage-squad:checked ~ .timeline .tl-item:not(.tl-item--squad),
.page-about #stage-now:checked ~ .timeline .tl-item:not(.tl-item--now) {
  display: none;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0 0 0 22px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--lime), var(--line) 45%, transparent);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 34px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--lime);
  box-shadow: 0 0 0 3px rgba(6, 21, 18, 0.9);
}

.page-about .tl-item .tag {
  margin-bottom: 8px;
}

.page-about .tl-item h3 {
  margin: 0 0 7px;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 600;
  color: var(--white);
}

.page-about .tl-item p {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .history__media {
  margin: 0;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--bg-deep);
}

.page-about .history__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.08) brightness(0.8);
}

/* ---------- 流程 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .steps {
  margin-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line);
}

.page-about .step {
  border-bottom: 1px solid var(--line);
}

.page-about .step summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 17px 0;
  cursor: pointer;
  list-style: none;
  color: var(--white);
}

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

.page-about .step__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .step__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 21px);
  letter-spacing: 0.01em;
}

.page-about .step__plus {
  position: relative;
  margin-left: auto;
  flex: none;
  width: 16px;
  height: 16px;
}

.page-about .step__plus::before,
.page-about .step__plus::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.page-about .step__plus::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1.5px;
}

.page-about .step__plus::after {
  left: 7px;
  top: 0;
  width: 1.5px;
  height: 16px;
}

.page-about .step[open] .step__plus::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .step__body {
  padding: 0 0 20px 26px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .step__body p {
  margin: 0 0 10px;
}

.page-about .step__out {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  color: var(--white);
}

.page-about .flow-media {
  margin: 0;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--bg-deep);
}

.page-about .flow-media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.1) brightness(0.8);
}

/* ---------- 团队 ---------- */
.page-about .roles {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .role-panels {
  margin-top: 18px;
}

.page-about .role-panel {
  display: none;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  background: radial-gradient(130% 130% at 100% 0%, rgba(198, 255, 61, 0.1), transparent 58%), var(--bg-deep);
}

.page-about #role-sched:checked ~ .role-panels .role-panel--sched,
.page-about #role-squad:checked ~ .role-panels .role-panel--squad,
.page-about #role-review:checked ~ .role-panels .role-panel--review,
.page-about #role-ops:checked ~ .role-panels .role-panel--ops {
  display: block;
}

.page-about .role-panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.4vw, 26px);
  color: var(--white);
}

.page-about .role-panel p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .role-panel__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px !important;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted) !important;
}

/* ---------- 覆盖与合作 ---------- */
.page-about .cover-stats {
  list-style: none;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .cover-stats li {
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--bg-deep);
}

.page-about .cover-stats__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.2vw, 46px);
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .cover-stats li:nth-child(1) .cover-stats__num {
  color: var(--lime);
}

.page-about .cover-stats li:nth-child(2) .cover-stats__num {
  color: var(--violet);
}

.page-about .cover-stats li:nth-child(3) .cover-stats__num {
  color: var(--orange);
}

.page-about .cover-stats__label {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .partners {
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .partners h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 23px);
  color: var(--white);
}

.page-about .partners ul {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .partners li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .partners li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
}

.page-about .partners strong {
  color: var(--white);
  font-weight: 600;
}

/* ---------- 反馈 ---------- */
.page-about .feedback {
  margin-top: clamp(24px, 3.5vw, 36px);
  padding: clamp(22px, 3.4vw, 36px);
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  background: radial-gradient(120% 150% at 100% 0%, rgba(198, 255, 61, 0.13), transparent 62%), var(--bg-deep);
}

.page-about .feedback__mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0;
}

.page-about .feedback__mail a {
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.9vw, 19px);
  color: var(--lime);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px solid rgba(198, 255, 61, 0.35);
}

.page-about .feedback__mail a:hover,
.page-about .feedback__mail a:focus-visible {
  border-bottom-color: var(--lime);
}

.page-about .feedback__tips {
  list-style: none;
  margin: 20px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .feedback__tips strong {
  color: var(--white);
  font-weight: 600;
}

.page-about .feedback__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 固定快捷入口 ---------- */
.page-about .to-schedule {
  display: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-quad {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 28px;
  }

  .page-about .cover-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .partners ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 30px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-block {
    grid-template-columns: var(--about-idx) minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 44px);
  }

  .page-about .step__body {
    padding-left: 34px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.62fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .history {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-about .history__media {
    position: sticky;
    top: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .to-schedule {
    display: inline-flex;
    position: fixed;
    right: clamp(16px, 2.5vw, 36px);
    bottom: calc(var(--dock-h) + 18px);
    z-index: 40;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}

<<<END>>>