.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 14px 0 0;
  background:
    radial-gradient(110% 80% at 6% 0%, var(--red-soft) 0%, rgba(255, 255, 255, 0) 58%),
    linear-gradient(180deg, var(--white) 0%, var(--paper) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  padding: 10px 0 0;
}

.page-about .about-hero h1 {
  margin: 10px 0 14px;
  font-size: clamp(30px, 6.4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--navy);
}

.page-about .about-hero__lead {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .fact {
  position: relative;
  padding: 14px 15px 16px;
  background: var(--white);
  border: 1px solid var(--mist);
  border-top: 3px solid var(--red);
  box-shadow: var(--shadow-card);
}

.page-about .fact::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 16px;
  height: 16px;
  background: var(--paper);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--navy);
}

.page-about .fact__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.page-about .about-hero__media {
  margin: 24px auto 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-top: 4px solid var(--red);
  border-bottom: 1px solid var(--mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 22px;
  padding-top: 30px;
  padding-bottom: 8px;
}

.page-about .about-toc {
  padding: 14px 16px;
  background: var(--white);
  border-left: 3px solid var(--red);
  border-top: 1px solid var(--mist);
  border-right: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--red);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__list a {
  display: block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px dashed var(--mist);
  transition: color 0.2s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--red);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 26px 0 30px;
  scroll-margin-top: 96px;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--mist);
}

.page-about .section-kicker {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--red);
}

.page-about .section-kicker::before {
  content: "";
  width: 22px;
  height: 3px;
  background: var(--red);
}

.page-about .about-section .section__title {
  margin: 0 0 10px;
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--navy);
}

.page-about .about-section .section__lead {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 6px;
  border-radius: 3px;
  background: repeating-linear-gradient(
    180deg,
    var(--red) 0 10px,
    var(--white) 10px 20px
  );
}

.page-about .timeline__item {
  position: relative;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--navy);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .timeline__box {
  background: var(--white);
  border: 1px solid var(--mist);
  border-left: 3px solid var(--red);
}

.page-about .timeline__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  color: var(--navy);
}

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

.page-about .timeline__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--red);
}

.page-about .timeline__box[open] .timeline__head::after {
  content: "–";
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--red);
}

.page-about .timeline__name {
  font-size: 15px;
}

.page-about .timeline__body {
  padding: 0 14px 14px;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 看台 ---------- */
.page-about .stand-layout {
  display: grid;
  gap: 18px;
}

.page-about .stand-widget {
  position: relative;
  min-width: 0;
}

.page-about .stand-radio {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .stand-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.page-about .stand-chip {
  cursor: pointer;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-soft);
  background: var(--white);
  border: 1px solid var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about #stand-a:checked ~ .stand-switch label[for="stand-a"],
.page-about #stand-b:checked ~ .stand-switch label[for="stand-b"],
.page-about #stand-c:checked ~ .stand-switch label[for="stand-c"] {
  background: var(--red);
  border-color: var(--red-dark);
  color: var(--white);
}

.page-about .stand-map {
  margin: 0;
  padding: 12px;
  background: var(--white);
  border: 1px solid var(--mist);
}

.page-about .stand-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .stand-map .pitch {
  fill: var(--green);
  opacity: 0.9;
}

.page-about .stand-map .pitch-line {
  fill: none;
  stroke: var(--white);
  stroke-width: 2;
}

.page-about .stand-map .zone {
  opacity: 0.38;
  stroke: var(--paper);
  stroke-width: 2;
  transition: opacity 0.25s var(--ease);
}

.page-about .stand-map .z-a {
  fill: var(--red);
}

.page-about .stand-map .z-b {
  fill: var(--navy);
}

.page-about .stand-map .z-c {
  fill: var(--navy-2);
}

.page-about #stand-a:checked ~ .stand-map .z-a,
.page-about #stand-b:checked ~ .stand-map .z-b,
.page-about #stand-c:checked ~ .stand-map .z-c {
  opacity: 1;
}

.page-about .stand-map figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .stand-panels {
  margin-top: 14px;
}

.page-about .stand-panel {
  display: none;
  padding: 14px 16px;
  background: var(--white);
  border: 1px solid var(--mist);
}

.page-about #stand-a:checked ~ .stand-panels .stand-panel--a,
.page-about #stand-b:checked ~ .stand-panels .stand-panel--b,
.page-about #stand-c:checked ~ .stand-panels .stand-panel--c {
  display: block;
}

.page-about .stand-panel--a {
  border-left: 4px solid var(--red);
}

.page-about .stand-panel--b {
  border-left: 4px solid var(--navy);
}

.page-about .stand-panel--c {
  border-left: 4px solid var(--navy-2);
}

.page-about .stand-panel__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 900;
  color: var(--navy);
}

.page-about .stand-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .stand-photo {
  margin: 0;
  border-top: 4px solid var(--red);
}

.page-about .stand-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ---------- 费用路径 ---------- */
.page-about .cost-path {
  display: grid;
  gap: 14px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-about .cost-node {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--white);
  border: 1px solid var(--mist);
}

.page-about .cost-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 4px;
  background: var(--gold);
}

.page-about .cost-node__step {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--red);
  letter-spacing: 0.08em;
}

.page-about .cost-node__title {
  margin: 6px 0 8px;
  font-size: 17px;
  font-weight: 900;
  color: var(--navy);
}

.page-about .cost-node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .cost-node::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -14px;
  width: 14px;
  border-top: 2px dashed var(--gold);
}

.page-about .cost-node:last-child::after {
  display: none;
}

@media (max-width: 759px) {
  .page-about .cost-node::after {
    display: none;
  }
}

.page-about .cost-note {
  margin: 0;
  padding: 12px 14px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-soft);
  background: var(--red-soft);
  border-left: 3px solid var(--red);
}

.page-about .cost-note a {
  color: var(--red-dark);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .team-card {
  position: relative;
  padding: 18px 16px 16px;
  background: var(--white);
  border: 1px solid var(--mist);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--red);
}

.page-about .team-card--a {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .team-card--b {
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .team-card--b::before {
  background: var(--navy);
}

.page-about .team-card--c {
  clip-path: polygon(20px 0, 100% 0, 100% 100%, 0 100%, 0 20px);
}

.page-about .team-card--c::before {
  background: var(--green);
}

.page-about .team-card--d {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.page-about .team-card--d::before {
  background: var(--gold);
}

.page-about .team-card__count {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--white);
  background: var(--navy);
  padding: 3px 8px;
}

.page-about .team-card__title {
  margin: 10px 0 6px;
  font-size: 15px;
  font-weight: 900;
  color: var(--navy);
}

.page-about .team-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .team-media {
  margin: 16px 0 0;
  border-left: 4px solid var(--navy);
}

.page-about .team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ---------- 合作 ---------- */
.page-about .partner-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 82%);
  gap: 12px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .partner-card {
  scroll-snap-align: start;
  padding: 16px;
  background: var(--white);
  border: 1px solid var(--mist);
  border-bottom: 3px solid var(--red);
}

.page-about .partner-card__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--red);
}

.page-about .partner-card__title {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 900;
  color: var(--navy);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 承诺 ---------- */
.page-about .about-promise {
  position: relative;
  margin-top: 34px;
  padding: 36px 0 40px;
  overflow: hidden;
  color: var(--white);
  background: linear-gradient(160deg, var(--navy) 0%, #06152a 100%);
}

.page-about .about-promise::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -90px;
  width: 300px;
  height: 300px;
  background: linear-gradient(135deg, var(--red) 0%, var(--gold) 100%);
  opacity: 0.18;
  transform: rotate(18deg);
}

.page-about .about-promise__kicker {
  position: relative;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-promise__title {
  position: relative;
  margin: 0 0 24px;
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1.2;
  font-weight: 900;
  color: var(--white);
}

.page-about .promise-grid {
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .promise {
  padding: 18px 16px;
  background: rgba(255, 255, 255, 0.06);
  border-left: 3px solid var(--gold);
}

.page-about .promise__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .promise__title {
  margin: 6px 0 8px;
  font-size: 15px;
  font-weight: 900;
  color: var(--white);
}

.page-about .promise p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-promise__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 760px) {
  .page-about .cost-path {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding-top: 18px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 34px;
    padding-top: 16px;
  }

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

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

  .page-about .partner-rail {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow-x: visible;
    padding-bottom: 0;
  }
}

@media (min-width: 960px) {
  .page-about .stand-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: 22px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 184px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
    padding-top: 38px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
  }

  .page-about .about-toc__list {
    display: grid;
    gap: 0;
  }

  .page-about .about-toc__list a {
    padding: 8px 0;
  }

  .page-about .about-section {
    padding: 30px 0 36px;
  }

  .page-about .about-promise {
    margin-top: 8px;
    padding: 52px 0 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stand-chip,
  .page-about .stand-map .zone,
  .page-about .about-toc__list a {
    transition: none;
  }
}
<<<END>>>