.page-about {
  --about-radius: 14px;
  --about-soft: rgba(13, 39, 64, 0.55);
}

.page-about .about-top {
  padding-block: 18px 4px;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .breadcrumbs__link {
  color: var(--slate);
  text-decoration: none;
  transition: color var(--dur) ease;
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumbs__sep {
  color: rgba(157, 176, 195, 0.45);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(20px, 4vw, 52px) clamp(24px, 4vw, 44px);
  background:
    radial-gradient(90% 120% at 88% 0%, rgba(255, 106, 26, 0.14), transparent 62%),
    radial-gradient(70% 100% at 0% 100%, rgba(37, 224, 208, 0.1), transparent 66%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  min-width: 0;
}

.page-about .about-hero h1 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 6.6vw, 4rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(160deg, rgba(13, 39, 64, 0.92), rgba(6, 22, 39, 0.42));
  box-shadow: var(--shadow);
}

.page-about .about-hero__num {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .about-hero__lab {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- 外壳：索引 + 章节 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 10px;
  padding-bottom: clamp(32px, 5vw, 64px);
  min-width: 0;
}

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

.page-about .about-index {
  position: sticky;
  top: 0;
  z-index: 3;
  padding: 10px 0;
  background: rgba(6, 22, 39, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.page-about .about-index__label {
  display: none;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--slate);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) ease, background-color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-index__link .mono {
  font-size: 0.72rem;
  color: var(--cyan);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--navy);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-index__link:hover .mono,
.page-about .about-index__link:focus-visible .mono {
  color: var(--navy);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  margin-bottom: 14px;
  padding: clamp(20px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(180deg, rgba(13, 39, 64, 0.5), rgba(6, 22, 39, 0.28));
  overflow: hidden;
  min-width: 0;
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(157, 176, 195, 0.055) 0 1px,
    transparent 1px 9px
  );
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-chapter > * {
  position: relative;
  z-index: 1;
}

.page-about .about-chapter--teal {
  background:
    radial-gradient(120% 110% at 100% 0%, rgba(37, 224, 208, 0.14), transparent 58%),
    linear-gradient(168deg, rgba(11, 59, 62, 0.94), rgba(6, 22, 39, 0.82));
  border-color: rgba(37, 224, 208, 0.2);
}

.page-about .about-chapter--indigo {
  background:
    radial-gradient(110% 120% at 0% 0%, rgba(217, 164, 65, 0.1), transparent 60%),
    linear-gradient(168deg, rgba(37, 26, 69, 0.94), rgba(6, 22, 39, 0.82));
  border-color: rgba(157, 176, 195, 0.24);
}

.page-about .about-chapter--wine {
  background:
    radial-gradient(100% 120% at 100% 100%, rgba(255, 61, 127, 0.14), transparent 62%),
    linear-gradient(168deg, rgba(78, 27, 43, 0.88), rgba(6, 22, 39, 0.86));
  border-color: rgba(255, 61, 127, 0.2);
}

.page-about .about-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 16px;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter__no {
  font-size: clamp(1.3rem, 4vw, 1.9rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .about-chapter__head .section__title {
  flex: 1 1 260px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.24rem, 3.6vw, 2rem);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-chapter__lede {
  margin: 0 0 20px;
  max-width: 66ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--navy-deep);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 三个入口支柱 ---------- */
.page-about .about-pillar {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-pillar__item {
  padding-top: 12px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-pillar__item:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .about-pillar__item:nth-child(3) {
  border-top-color: var(--green);
}

.page-about .about-pillar__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-pillar__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 四个小组 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 14px;
}

.page-about .about-crew__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(6, 22, 39, 0.52);
  transition: transform var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-crew__item:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}

.page-about .about-crew__item .tag {
  align-self: flex-start;
}

.page-about .about-crew__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-crew__item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-crew__list {
  margin: 4px 0 0;
  padding: 10px 0 0;
  list-style: none;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 6px;
}

.page-about .about-crew__list li {
  position: relative;
  padding-left: 14px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: rgba(244, 248, 252, 0.78);
}

.page-about .about-crew__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

/* ---------- 赛季演进 ---------- */
.page-about .about-track {
  margin: 0 0 20px;
  padding: 16px 10px 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(5, 15, 28, 0.62);
}

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

.page-about .track-grid {
  stroke: rgba(157, 176, 195, 0.14);
  stroke-width: 1;
}

.page-about .track-base {
  stroke: rgba(157, 176, 195, 0.34);
  stroke-width: 1;
}

.page-about .track-line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .track-dot {
  fill: var(--navy-deep);
  stroke: var(--orange);
  stroke-width: 3;
  transition: fill var(--dur) ease, stroke-width var(--dur) ease;
}

.page-about .track-dot:hover {
  fill: var(--orange);
  stroke-width: 5;
}

.page-about .track-label {
  fill: var(--slate);
  font-family: var(--font-mono);
  font-size: 15px;
}

.page-about .track-label--hi {
  fill: var(--orange);
  font-size: 16px;
}

.page-about .about-track__legend {
  display: grid;
  gap: 14px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-track__legend li {
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
  transition: border-color var(--dur) ease;
}

.page-about .about-track__legend li:hover {
  border-left-color: var(--orange);
}

.page-about .about-track__legend .mono {
  display: block;
  margin-bottom: 4px;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-track__legend p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 每周节奏 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(37, 224, 208, 0));
}

.page-about .about-timeline li {
  position: relative;
  padding: 0 0 22px 30px;
}

.page-about .about-timeline li:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--navy-deep);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline .mono {
  display: block;
  margin-bottom: 3px;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-timeline h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-timeline p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 城市社群 ---------- */
.page-about .about-cities {
  display: grid;
  gap: 20px;
}

.page-about .about-cities__text p {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-cities__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cities__tags li {
  padding: 7px 12px;
  border: 1px solid rgba(255, 61, 127, 0.4);
  border-radius: 999px;
  font-size: 0.76rem;
  color: var(--white);
  background: rgba(255, 61, 127, 0.1);
}

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

/* ---------- 合作对接 ---------- */
.page-about .about-deals {
  display: grid;
  gap: 10px;
  margin: 0 0 20px;
}

.page-about .about-deal {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(13, 39, 64, 0.5);
  overflow: hidden;
}

.page-about .about-deal > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--white);
}

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

.page-about .about-deal > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-deal > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-deal[open] > summary {
  border-bottom: 1px solid var(--line);
}

.page-about .about-deal[open] > summary::after {
  content: "–";
}

.page-about .about-deal__body {
  padding: 14px 16px 18px;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--slate);
}

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

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

.page-about .about-contact {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-contact__mail {
  color: var(--cyan);
  word-break: break-all;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: 14px;
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid rgba(255, 106, 26, 0.32);
  border-radius: var(--about-radius);
  background:
    radial-gradient(120% 150% at 0% 0%, rgba(255, 106, 26, 0.2), transparent 60%),
    radial-gradient(90% 120% at 100% 100%, rgba(37, 224, 208, 0.14), transparent 62%),
    linear-gradient(160deg, rgba(13, 39, 64, 0.92), rgba(5, 15, 28, 0.94));
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3.8vw, 2rem);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  max-width: 60ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--slate);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-pillar {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 40px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-cities {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 28px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 28px;
    padding: 6px 0;
    background: none;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    backdrop-filter: none;
  }

  .page-about .about-index__label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 14px 16px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.16em;
    color: var(--slate);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 1px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__link {
    width: 100%;
    min-height: 42px;
    padding: 10px 12px 10px 16px;
    margin-left: -1px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    white-space: normal;
    font-size: 0.86rem;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    color: var(--cyan);
    background: rgba(37, 224, 208, 0.08);
    border-left-color: var(--cyan);
  }

  .page-about .about-index__link:hover .mono,
  .page-about .about-index__link:focus-visible .mono {
    color: var(--cyan);
  }
}

@media (min-width: 1100px) {
  .page-about .about-crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-crew__item:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-crew__item:nth-child(3) {
    margin-top: 12px;
  }

  .page-about .about-crew__item:nth-child(4) {
    margin-top: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__item,
  .page-about .about-index__link,
  .page-about .track-dot,
  .page-about .breadcrumbs__link {
    transition: none;
  }

  .page-about .about-crew__item:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>