.page-about {
  --about-block: clamp(3rem, 8vw, 6.5rem);
  color: var(--warm-white);
}

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

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.4vw, 2.9rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0.4rem 0 1rem;
}

.page-about h3 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.35;
  margin: 0 0 0.45rem;
}

.page-about p {
  margin: 0 0 1rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(2rem, 5vw, 3.25rem) 0 var(--about-block);
  background:
    radial-gradient(circle at 84% 6%, rgba(56, 242, 210, 0.12), transparent 58%),
    radial-gradient(circle at 8% 92%, rgba(255, 122, 46, 0.08), transparent 46%),
    var(--field-night);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 2.75rem);
  align-items: start;
  margin-top: 1.75rem;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.2vw, 4.05rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 1.15rem;
  color: var(--warm-white);
}

.page-about .about-hero__intro {
  max-width: 34em;
  color: var(--mist-blue);
  font-size: 1rem;
  line-height: 1.78;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem 2.4rem;
  list-style: none;
  margin: 2rem 0 0;
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--line-blue);
}

.page-about .about-hero__stat-num {
  display: block;
  font-size: 1.85rem;
  line-height: 1;
  color: var(--neon-cyan);
  letter-spacing: -0.01em;
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--mist-blue);
}

.page-about .about-hero__figure {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

/* ---------- 起点与定位 ---------- */
.page-about .about-origin {
  padding: var(--about-block) 0;
  background: var(--stand-blue);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-origin__copy p {
  max-width: 32em;
  color: var(--mist-blue);
  line-height: 1.78;
}

.page-about .about-origin__facts {
  display: grid;
  gap: 0.9rem;
}

.page-about .about-origin__fact {
  padding: 1rem 1.15rem;
  background: var(--panel-blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background var(--t-mid) var(--ease);
}

.page-about .about-origin__fact:hover {
  background: #21365a;
}

.page-about .about-origin__fact-label {
  margin: 0 0 0.45rem;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}

.page-about .about-origin__fact-text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--warm-white);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  padding: var(--about-block) 0;
  background:
    linear-gradient(180deg, var(--stand-blue) 0%, var(--field-night) 100%);
}

.page-about .about-tl__head {
  max-width: 40rem;
}

.page-about .about-tl__lead {
  color: var(--mist-blue);
  line-height: 1.78;
  margin-bottom: 2.25rem;
}

.page-about .about-tl__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

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

.page-about .about-tl__item {
  position: relative;
  z-index: 1;
  padding: 1.05rem 1.2rem 1.2rem;
  background: var(--panel-blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background var(--t-mid) var(--ease), transform var(--t-mid) var(--ease);
}

.page-about .about-tl__item:hover,
.page-about .about-tl__item:focus-within {
  background: #22385e;
  transform: translateY(-3px);
}

.page-about .about-tl__dot {
  display: block;
  width: 10px;
  height: 10px;
  margin-bottom: 0.7rem;
  background: transparent;
  border: 1px solid var(--neon-cyan);
  transition: background var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}

.page-about .about-tl__item:hover .about-tl__dot,
.page-about .about-tl__item:focus-within .about-tl__dot {
  background: var(--neon-cyan);
  box-shadow: 0 0 0 4px rgba(56, 242, 210, 0.18);
}

.page-about .about-tl__item:last-child .about-tl__dot {
  background: var(--neon-cyan);
}

.page-about .about-tl__meta {
  margin: 0 0 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist-blue);
}

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

.page-about .about-tl__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--mist-blue);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-block) 0;
  background: var(--field-night);
}

.page-about .about-team__head {
  max-width: 42rem;
}

.page-about .about-team__lead {
  color: var(--mist-blue);
  line-height: 1.78;
  margin-bottom: 2.25rem;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  align-items: stretch;
}

.page-about .about-team__col {
  display: flex;
  flex-direction: column;
  padding: 1.15rem 1.2rem 1.25rem;
  background: var(--stand-blue);
  border-left: 2px solid var(--line-blue);
  transition: border-color var(--t-fast) var(--ease), background var(--t-mid) var(--ease);
}

.page-about .about-team__col:hover,
.page-about .about-team__col:focus-within {
  border-left-color: var(--neon-cyan);
  background: #16233c;
}

.page-about .about-team__num {
  font-family: var(--font-data);
  font-size: 2.35rem;
  line-height: 1;
  color: var(--panel-blue);
  letter-spacing: -0.02em;
  margin: 0 0 0.6rem;
  transition: color var(--t-mid) var(--ease);
}

.page-about .about-team__col:hover .about-team__num {
  color: var(--neon-cyan);
}

.page-about .about-team__role {
  color: var(--warm-white);
  font-size: 1.08rem;
}

.page-about .about-team__duties {
  margin: auto 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-blue);
  padding-top: 0.8rem;
}

.page-about .about-team__duties li {
  position: relative;
  padding-left: 0.95rem;
  font-size: 0.85rem;
  line-height: 1.62;
  color: var(--mist-blue);
  margin-bottom: 0.45rem;
}

.page-about .about-team__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 1px;
  background: var(--deep-cyan);
}

.page-about .about-team__note {
  margin: 2rem 0 0;
  max-width: 46em;
  padding-left: 1rem;
  border-left: 2px solid var(--signal-orange);
  color: var(--mist-blue);
  font-size: 0.92rem;
  line-height: 1.78;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  padding: var(--about-block) 0;
  background: var(--panel-blue);
}

.page-about .about-flow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-flow__lead {
  color: #c4d2e6;
  line-height: 1.78;
  margin-bottom: 1.75rem;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .about-flow__steps > li {
  position: relative;
  padding: 0 0 1.4rem 2.15rem;
  border-left: 1px dashed rgba(56, 242, 210, 0.35);
  margin-left: 0.5rem;
}

.page-about .about-flow__steps > li:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-flow__steps > li::before {
  counter-increment: flow;
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: -0.72rem;
  top: -0.15rem;
  width: 1.45rem;
  height: 1.45rem;
  display: grid;
  place-items: center;
  font-family: var(--font-data);
  font-size: 0.68rem;
  color: var(--field-night);
  background: var(--neon-cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 5px), calc(100% - 5px) 100%, 0 100%);
}

.page-about .about-flow__steps h3 {
  color: var(--warm-white);
}

.page-about .about-flow__steps p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: #c4d2e6;
}

.page-about .about-flow__figure {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

/* ---------- 内容准则 ---------- */
.page-about .about-rules {
  padding: var(--about-block) 0;
  background: var(--stand-blue);
}

.page-about .about-rules__head {
  max-width: 40rem;
}

.page-about .about-rules__lead {
  color: var(--mist-blue);
  line-height: 1.78;
  margin-bottom: 2.25rem;
}

.page-about .about-rules__list {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-about .about-rules__list > li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.page-about .about-rules__num {
  display: grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  font-size: 0.82rem;
  color: var(--field-night);
  background: var(--neon-cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-rules__list h3 {
  color: var(--warm-white);
}

.page-about .about-rules__list p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.76;
  color: var(--mist-blue);
  max-width: 36em;
}

.page-about .about-rules__more {
  border-top: 1px solid var(--line-blue);
  padding-top: 1.25rem;
  max-width: 44rem;
}

.page-about .about-rules__more summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  color: var(--neon-cyan);
  list-style: none;
  padding: 0.35rem 0;
  transition: color var(--t-fast) var(--ease);
}

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

.page-about .about-rules__more summary::after {
  content: "＋";
  display: inline-block;
  margin-left: 0.6rem;
  font-family: var(--font-data);
  font-size: 0.85rem;
}

.page-about .about-rules__more[open] summary::after {
  content: "－";
}

.page-about .about-rules__more summary:hover,
.page-about .about-rules__more summary:focus-visible {
  color: var(--warm-white);
}

.page-about .about-rules__more ul {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
}

.page-about .about-rules__more li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.7rem;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist-blue);
}

.page-about .about-rules__more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border: 1px solid var(--amber);
}

/* ---------- 社群 ---------- */
.page-about .about-community {
  padding: var(--about-block) 0;
  background:
    linear-gradient(160deg, var(--ink-black) 0%, var(--field-night) 58%, #14243c 100%);
}

.page-about .about-community__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: center;
}

.page-about .about-community__figure {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-community__copy p {
  max-width: 34em;
  color: var(--mist-blue);
  line-height: 1.78;
}

.page-about .about-community__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.25rem;
  margin: 1.5rem 0 1.75rem;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--line-blue);
}

.page-about .about-community__facts div {
  min-width: 6rem;
}

.page-about .about-community__facts dt {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist-blue);
  margin-bottom: 0.4rem;
}

.page-about .about-community__facts dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 1.35rem;
  color: var(--warm-white);
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  padding: clamp(3rem, 9vw, 7rem) 0;
  background: var(--warm-white);
  color: var(--ink-strong);
}

.page-about .about-closing__line {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.6vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  max-width: 22em;
  margin: 0 0 1.25rem;
}

.page-about .about-closing__sub {
  max-width: 34em;
  color: #46566f;
  line-height: 1.78;
  margin-bottom: 1.9rem;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 4rem;
    align-items: start;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 4rem;
  }

  .page-about .about-community__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 4rem;
  }

  .page-about .about-tl__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: 0;
    row-gap: 2.25rem;
    padding-top: 0.5rem;
  }

  .page-about .about-tl__rail {
    display: block;
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    color: var(--line-blue);
    z-index: 0;
    pointer-events: none;
  }

  .page-about .about-tl__item:nth-child(2) {
    grid-column: 1 / span 5;
    grid-row: 1;
  }

  .page-about .about-tl__item:nth-child(3) {
    grid-column: 4 / span 3;
    grid-row: 2;
  }

  .page-about .about-tl__item:nth-child(4) {
    grid-column: 6 / span 4;
    grid-row: 3;
  }

  .page-about .about-tl__item:nth-child(5) {
    grid-column: 8 / span 3;
    grid-row: 4;
  }

  .page-about .about-tl__item:nth-child(6) {
    grid-column: 9 / span 4;
    grid-row: 5;
  }
}

@media (min-width: 1024px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.9rem;
  }

  .page-about .about-team__col:nth-child(1) {
    min-height: 20rem;
  }

  .page-about .about-team__col:nth-child(2) {
    min-height: 14.5rem;
  }

  .page-about .about-team__col:nth-child(3) {
    min-height: 17rem;
  }

  .page-about .about-team__col:nth-child(4) {
    min-height: 11.5rem;
  }

  .page-about .about-rules__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
  }

  .page-about .about-rules__list > li {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-tl__dot,
  .page-about .about-team__col,
  .page-about .about-team__num,
  .page-about .about-origin__fact {
    transition: none;
  }

  .page-about .about-tl__item:hover,
  .page-about .about-tl__item:focus-within {
    transform: none;
  }
}
<<<END>>>