.page-about {
  --about-hairline: rgba(21, 24, 26, 0.12);
  --about-hairline-light: rgba(245, 242, 234, 0.16);
  --about-glow: rgba(63, 224, 180, 0.16);
  background: var(--charcoal);
}

.page-about .about-hero {
  position: relative;
  overflow: clip;
  background:
    radial-gradient(circle at 88% -14%, var(--about-glow), transparent 58%),
    radial-gradient(circle at 4% 108%, rgba(217, 36, 43, 0.18), transparent 52%),
    var(--charcoal);
  color: var(--paper);
  padding-block: clamp(20px, 4vw, 36px) clamp(44px, 6vw, 88px);
}

.page-about .about-hero .breadcrumbs {
  color: var(--mint-soft);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--mint-soft);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover,
.page-about .about-hero .breadcrumbs a:focus-visible {
  color: var(--paper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.14;
  font-size: clamp(2rem, 5.2vw, 3.9rem);
  margin: 10px 0 18px;
  max-width: 15em;
}

.page-about .about-hero__lead .lede {
  color: var(--mint-soft);
  max-width: 34em;
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 18px 14px;
  margin-top: clamp(24px, 3vw, 36px);
  padding-top: 22px;
  border-top: 1px solid var(--about-hairline-light);
}

.page-about .about-hero__facts .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1.1;
  color: var(--neon-mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-unit {
  font-size: 0.55em;
  margin-left: 2px;
}

.page-about .about-hero__facts .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.86rem;
  color: var(--slate);
  line-height: 1.5;
}

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

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-hairline-light);
}

.page-about .about-hero__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-serif);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--slate);
  padding-left: 12px;
  border-left: 2px solid var(--signal-red);
}

/* 时间线 */
.page-about .about-timeline {
  background: var(--paper);
  color: var(--charcoal);
  overflow-x: clip;
  padding-block: clamp(44px, 6vw, 88px);
}

.page-about .about-timeline__head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-time {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-time__rail-title {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  color: var(--slate);
  margin-bottom: 12px;
}

.page-about .about-time__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  scrollbar-width: thin;
}

.page-about .about-time__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 14px;
  border: 1px solid var(--paper-dim);
  border-radius: var(--pill);
  text-decoration: none;
  color: var(--charcoal);
  font-size: 0.88rem;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-time__link:hover,
.page-about .about-time__link:focus-visible {
  border-color: var(--signal-red);
  background: rgba(217, 36, 43, 0.06);
}

.page-about .about-time__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--deep-red);
  font-weight: 700;
}

.page-about .about-time__label {
  color: var(--slate);
}

.page-about .about-time__body > * + * {
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-stage {
  background: #ffffff;
  border: 1px solid var(--paper-dim);
  border-radius: 24px;
  padding: clamp(20px, 3vw, 32px);
  box-shadow: 0 1px 0 rgba(21, 24, 26, 0.03);
}

.page-about .about-stage__year {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--deep-red);
  margin: 0;
}

.page-about .about-stage__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  margin: 8px 0 10px;
}

.page-about .about-stage p:last-child {
  margin-bottom: 0;
  line-height: 1.8;
}

.page-about .about-note {
  border-left: 2px solid var(--signal-red);
  padding-left: 16px;
  background: transparent;
}

.page-about .about-note summary {
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--charcoal);
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

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

.page-about .about-note summary::after {
  content: "展开";
  font-family: var(--font-body);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--deep-red);
  border: 1px solid var(--deep-red);
  border-radius: var(--pill);
  padding: 2px 9px;
  flex: none;
}

.page-about .about-note[open] summary::after {
  content: "收起";
  background: var(--deep-red);
  color: var(--paper);
}

.page-about .about-note p {
  margin: 12px 0 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--charcoal);
}

.page-about .about-bleed {
  border-radius: 24px;
  overflow: hidden;
  background: var(--paper-dim);
}

.page-about .about-bleed img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 2;
  object-fit: cover;
}

.page-about .about-bleed__caption {
  margin: 0;
  padding: 12px 18px;
  background: var(--charcoal);
  color: var(--mint-soft);
  font-family: var(--font-serif);
  font-size: 0.86rem;
  line-height: 1.6;
}

/* 规则维护 */
.page-about .about-rules {
  padding-block: clamp(44px, 6vw, 88px);
}

.page-about .about-rules__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-rules__intro .lede {
  color: var(--mint-soft);
}

.page-about .about-rule {
  border-top: 1px solid rgba(168, 242, 220, 0.24);
  padding-top: 18px;
}

.page-about .about-rule + .about-rule {
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-rule__key {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--neon-mint);
  margin: 0 0 8px;
}

.page-about .about-rule__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-rule p:last-child {
  margin-bottom: 0;
  line-height: 1.85;
  color: rgba(245, 242, 234, 0.82);
}

/* 团队 */
.page-about .about-team {
  background: var(--paper);
  color: var(--charcoal);
  padding-block: clamp(44px, 6vw, 88px);
}

.page-about .about-team__head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-ring {
  display: grid;
  gap: 20px;
  justify-items: center;
}

.page-about .about-ring__svg {
  width: 100%;
  max-width: 260px;
  height: auto;
}

.page-about .about-ring__track {
  fill: none;
  stroke: rgba(21, 24, 26, 0.07);
  stroke-width: 22;
}

.page-about .about-ring__seg {
  fill: none;
  stroke-width: 22;
  transition: stroke-width 200ms var(--ease);
}

.page-about .about-ring__seg--1 { stroke: var(--signal-red); }
.page-about .about-ring__seg--2 { stroke: var(--deep-red); }
.page-about .about-ring__seg--3 { stroke: var(--pitch-green); }
.page-about .about-ring__seg--4 { stroke: var(--neon-mint); }

.page-about .about-ring__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  fill: var(--charcoal);
}

.page-about .about-ring__unit {
  font-family: var(--font-body);
  font-size: 13px;
  fill: var(--slate);
}

.page-about .about-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
  width: 100%;
  max-width: 320px;
}

.page-about .about-legend__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 0.92rem;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-legend__item:hover,
.page-about .about-legend__item:focus-visible {
  background: #ffffff;
  border-color: var(--paper-dim);
  outline: none;
}

.page-about .about-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
}

.page-about .about-legend__dot--1 { background: var(--signal-red); }
.page-about .about-legend__dot--2 { background: var(--deep-red); }
.page-about .about-legend__dot--3 { background: var(--pitch-green); }
.page-about .about-legend__dot--4 { background: var(--neon-mint); }

.page-about .about-legend__name {
  flex: 1 1 auto;
}

.page-about .about-legend__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--slate);
  font-size: 0.86rem;
}

.page-about .about-ring:has(.about-legend__item:nth-child(1):hover) .about-ring__seg--1,
.page-about .about-ring:has(.about-legend__item:nth-child(1):focus-visible) .about-ring__seg--1,
.page-about .about-ring:has(.about-legend__item:nth-child(2):hover) .about-ring__seg--2,
.page-about .about-ring:has(.about-legend__item:nth-child(2):focus-visible) .about-ring__seg--2,
.page-about .about-ring:has(.about-legend__item:nth-child(3):hover) .about-ring__seg--3,
.page-about .about-ring:has(.about-legend__item:nth-child(3):focus-visible) .about-ring__seg--3,
.page-about .about-ring:has(.about-legend__item:nth-child(4):hover) .about-ring__seg--4,
.page-about .about-ring:has(.about-legend__item:nth-child(4):focus-visible) .about-ring__seg--4 {
  stroke-width: 30;
}

.page-about .about-team__roles {
  display: grid;
  gap: 16px;
}

.page-about .about-role {
  border: 1px solid var(--paper-dim);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.6);
}

.page-about .about-role__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  margin: 0 0 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .about-role__title .pill {
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--charcoal);
}

.page-about .about-team__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 24px;
  border: 1px solid var(--paper-dim);
}

.page-about .about-team__figure figcaption {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--slate);
  padding-left: 12px;
  border-left: 2px solid var(--signal-red);
}

/* 三条做法 */
.page-about .about-code {
  background:
    radial-gradient(circle at 92% 4%, rgba(63, 224, 180, 0.12), transparent 52%),
    var(--charcoal);
  color: var(--paper);
  padding-block: clamp(44px, 6vw, 88px);
}

.page-about .about-code__head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-code__head .lede {
  color: var(--mint-soft);
}

.page-about .about-code__list {
  display: grid;
  gap: 16px;
}

.page-about .about-code__item {
  border: 1px solid var(--about-hairline-light);
  border-radius: 24px;
  padding: clamp(20px, 3vw, 28px);
  background: rgba(245, 242, 234, 0.04);
}

.page-about .about-code__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--neon-mint);
  margin: 0 0 10px;
  letter-spacing: 0.04em;
}

.page-about .about-code__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  margin: 0 0 10px;
}

.page-about .about-code__item > p:not(.about-code__num) {
  margin: 0;
  line-height: 1.85;
  color: rgba(245, 242, 234, 0.82);
  font-size: 0.95rem;
}

.page-about .about-steps {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-steps__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(63, 224, 180, 0.42);
  border-radius: var(--pill);
  padding: 7px 14px;
  font-size: 0.86rem;
  color: var(--mint-soft);
}

.page-about .about-steps__index {
  font-family: var(--font-mono);
  color: var(--neon-mint);
  font-weight: 700;
}

/* 站点信息 */
.page-about .about-site {
  background: var(--paper);
  color: var(--charcoal);
  padding-block: clamp(44px, 6vw, 88px);
}

.page-about .about-site__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

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

.page-about .about-site__links .link-arrow {
  font-size: 0.94rem;
}

.page-about .about-facts {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}

.page-about .about-facts caption {
  text-align: left;
  font-family: var(--font-serif);
  font-size: 0.88rem;
  color: var(--slate);
  padding-bottom: 10px;
}

.page-about .about-facts th,
.page-about .about-facts td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--paper-dim);
  vertical-align: top;
  line-height: 1.7;
}

.page-about .about-facts thead th {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--slate);
  background: var(--paper-dim);
  border-bottom: none;
}

.page-about .about-facts tbody th {
  font-weight: 700;
  white-space: nowrap;
  color: var(--charcoal);
  background: rgba(226, 222, 210, 0.42);
  width: 32%;
}

.page-about .about-facts tbody td {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

@media (min-width: 640px) {
  .page-about .about-code__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-rules__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 20px;
  }

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

  .page-about .about-site__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

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

@media (min-width: 960px) {
  .page-about .about-time {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-time__rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-time__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    border-left: 1.5px solid var(--paper-dim);
    margin-left: 6px;
    padding-bottom: 0;
  }

  .page-about .about-time__link {
    border: none;
    border-radius: 0;
    padding: 11px 0 11px 18px;
    position: relative;
    font-size: 0.94rem;
    gap: 12px;
    transition: color var(--dur) var(--ease);
  }

  .page-about .about-time__link:hover,
  .page-about .about-time__link:focus-visible {
    background: transparent;
    color: var(--deep-red);
  }

  .page-about .about-time__link::before {
    content: "";
    position: absolute;
    left: -5.5px;
    top: 50%;
    transform: translateY(-50%);
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--paper);
    border: 1.5px solid var(--deep-red);
    transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .page-about .about-time__link:hover::before,
  .page-about .about-time__link:focus-visible::before {
    background: var(--signal-red);
    border-color: var(--signal-red);
  }
}

@media (min-width: 1100px) {
  .page-about .about-bleed {
    margin-right: calc(-1 * clamp(24px, 5vw, 88px));
    border-radius: 24px 0 0 24px;
  }

  .page-about .about-timeline__head {
    max-width: 46rem;
  }
}

@media (max-width: 520px) {
  .page-about .about-stage,
  .page-about .about-code__item {
    border-radius: 20px;
  }

  .page-about .about-facts tbody th {
    white-space: normal;
    width: 38%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-ring__seg,
  .page-about .about-time__link,
  .page-about .about-time__link::before,
  .page-about .about-legend__item {
    transition: none;
  }
}
<<<END>>>