.page-about {
  --about-line: rgba(243, 236, 221, 0.12);
  --about-card: rgba(14, 42, 58, 0.72);
  --about-card-hi: rgba(22, 70, 90, 0.55);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(72px, 13vw, 148px) 0 clamp(48px, 7vw, 84px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__sky {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.34;
  filter: saturate(0.55) brightness(0.8);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 90% at 78% 8%, rgba(61, 242, 192, 0.10) 0%, transparent 58%),
    linear-gradient(180deg, rgba(7, 22, 31, 0.30) 0%, rgba(7, 22, 31, 0.86) 56%, var(--night) 100%);
}

.page-about .about-hero__inner {
  max-width: 900px;
}

.page-about .about-hero h1 {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 8.4vw, 72px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 46em;
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.9;
  color: rgba(243, 236, 221, 0.82);
}

.page-about .about-stages {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-stages__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
  margin-right: 4px;
}

.page-about .about-stages__node {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid var(--glass-line);
  border-radius: 999px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  text-decoration: none;
  color: var(--paper);
  font-size: 13px;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-about .about-stages__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--neon);
}

.page-about .about-stages__node:hover,
.page-about .about-stages__node:focus-visible {
  border-color: var(--neon);
  background: rgba(61, 242, 192, 0.10);
  color: var(--neon);
}

/* ---------- 目录 ---------- */

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

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
}

.page-about .about-index__item a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 16px;
  background: var(--night);
  text-decoration: none;
  color: rgba(243, 236, 221, 0.86);
  font-size: 15px;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-index__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  flex: 0 0 auto;
}

.page-about .about-index__item a:hover,
.page-about .about-index__item a:focus-visible {
  background: var(--deep);
  color: var(--neon);
}

.page-about .about-index__item a:hover .about-index__n,
.page-about .about-index__item a:focus-visible .about-index__n {
  color: var(--neon);
}

/* ---------- 通用章节 ---------- */

.page-about .about-sec {
  padding: clamp(52px, 9vw, 104px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-sec__head {
  max-width: 42em;
}

.page-about .about-sec__head h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.4vw, 38px);
  font-weight: 300;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-sec__sub {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(243, 236, 221, 0.72);
}

/* ---------- 发展历程 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: clamp(34px, 6vw, 60px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--tier-1) 0%, var(--tier-2) 38%, var(--tier-3) 70%, var(--tier-4) 100%);
  opacity: 0.85;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 40px;
  padding-bottom: clamp(30px, 5vw, 48px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--moss);
  background: var(--deep);
  box-shadow: 0 0 0 4px rgba(7, 22, 31, 0.9);
}

.page-about .about-timeline__item:nth-child(2)::before {
  border-color: var(--tier-2);
  background: var(--tier-2);
}

.page-about .about-timeline__item:nth-child(3)::before {
  border-color: var(--tier-3);
  background: var(--tier-3);
}

.page-about .about-timeline__item:nth-child(4)::before {
  border-color: var(--neon);
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(7, 22, 31, 0.9), 0 0 16px rgba(61, 242, 192, 0.5);
}

.page-about .about-timeline__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-timeline__body h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.2vw, 25px);
  font-weight: 400;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-timeline__body p {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(243, 236, 221, 0.74);
}

/* ---------- 团队分工 ---------- */

.page-about .about-roles {
  display: grid;
  gap: 2px;
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-role {
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--moss);
  background: var(--about-card);
  transition: border-left-color 0.2s ease, background 0.2s ease;
}

.page-about .about-role[open] {
  border-left-color: var(--neon);
  background: var(--about-card-hi);
}

.page-about .about-role > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 17px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-role__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-role__name {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-role__count {
  position: relative;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--neon);
  border-bottom: 1px dashed rgba(61, 242, 192, 0.5);
  padding-bottom: 2px;
  white-space: nowrap;
}

.page-about .about-role__tip {
  position: absolute;
  right: 0;
  bottom: calc(100% + 12px);
  width: min(250px, 64vw);
  padding: 10px 13px;
  background: var(--ink);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.65;
  letter-spacing: 0;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  transform: translateY(5px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
  pointer-events: none;
  z-index: 6;
}

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

.page-about .about-role__body {
  padding: 0 18px 20px 44px;
}

.page-about .about-role__body p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 236, 221, 0.72);
}

/* ---------- 上线流程 ---------- */

.page-about .about-sec--flow {
  padding-top: clamp(40px, 6vw, 72px);
}

.page-about .about-flow__figure {
  margin: 0 0 clamp(34px, 5vw, 56px);
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  filter: grayscale(1) contrast(1.06);
  opacity: 0.8;
}

.page-about .about-flow__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-flow__step {
  position: relative;
  padding: 24px 20px 28px;
  background: var(--deep);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--tier-2), var(--tier-4));
  opacity: 0.55;
}

.page-about .about-flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon);
  margin-bottom: 12px;
}

.page-about .about-flow__step h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 236, 221, 0.72);
}

/* ---------- 判罚处理 ---------- */

.page-about .about-dispute {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(30px, 5vw, 52px);
  align-items: start;
}

.page-about .about-dispute__main p {
  margin: 0 0 20px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.95;
  color: rgba(243, 236, 221, 0.78);
}

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

.page-about .about-dispute__main a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 192, 0.45);
}

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

.page-about .about-dispute__aside .note {
  border-left-color: var(--amber);
}

/* ---------- 合作与生态 ---------- */

.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 52px);
  margin-top: clamp(30px, 5vw, 52px);
  align-items: start;
}

.page-about .about-partners__text h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-partners__text h3:not(:first-child) {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-partners__text p {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(243, 236, 221, 0.74);
}

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

.page-about .about-partners__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background: var(--deep);
  opacity: 0.9;
}

.page-about .about-partners__fig figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 长期跟下去 ---------- */

.page-about .about-longterm {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
  margin-top: clamp(30px, 5vw, 52px);
  align-items: start;
}

.page-about .about-longterm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-longterm__list li {
  padding-left: 18px;
  border-left: 1px solid var(--about-line);
}

.page-about .about-longterm__list h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-longterm__list p {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(243, 236, 221, 0.74);
}

.page-about .about-longterm__list a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 192, 0.45);
}

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

.page-about .about-longterm__stats {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-longterm__stats .stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 18px;
  background: var(--about-card);
}

.page-about .about-longterm__stats .stat__num {
  flex: 0 0 auto;
  font-size: clamp(30px, 6vw, 42px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-longterm__stats .stat__label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: clamp(48px, 8vw, 88px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
  padding: clamp(28px, 5vw, 44px);
  border: 1px solid var(--glass-line);
  border-left: 3px solid var(--neon);
  border-radius: var(--radius);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(61, 242, 192, 0.12) 0%, transparent 60%),
    var(--deep);
}

.page-about .about-cta__text h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 300;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-cta__text p {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 236, 221, 0.72);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about .about-index__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-dispute {
    grid-template-columns: minmax(0, 1fr) minmax(0, 260px);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  }

  .page-about .about-longterm {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 1020px) {
  .page-about .about-index__list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-role__body {
    padding-left: 62px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stages__node,
  .page-about .about-index__item a,
  .page-about .about-role,
  .page-about .about-role__tip {
    transition: none;
  }

  .page-about .about-role__tip {
    transform: none;
  }
}
<<<END>>>