.page-about {
  --about-line: rgba(23, 162, 255, 0.22);
  --about-paper-line: rgba(20, 24, 31, 0.16);
  --about-paper-soft: rgba(255, 255, 255, 0.62);
  display: block;
}

.page-about .breadcrumb {
  margin: 0 0 16px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: 0 0 48px;
}

.page-about .about-hero__frame {
  position: relative;
  padding: 22px 20px 30px;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(23, 162, 255, 0.16), transparent 62%),
    linear-gradient(158deg, var(--ink-2), var(--ink) 72%);
  border: 1px solid var(--hairline);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(244, 235, 223, 0.035) 0 1px, transparent 1px 5px);
}

.page-about .about-hero__meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  justify-content: space-between;
  padding-bottom: 12px;
  margin-bottom: 20px;
  border-bottom: 1px dashed var(--hairline);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--haze);
}

.page-about .about-hero__ver {
  color: var(--lime);
}

.page-about .about-hero h1 {
  position: relative;
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 7.4vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  position: relative;
  max-width: 52ch;
  color: rgba(244, 235, 223, 0.86);
}

.page-about .about-facts {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink);
}

.page-about .about-fact__num {
  font-family: var(--font-data);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper);
  line-height: 1;
}

.page-about .about-fact__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--haze);
}

/* ---------- 运营历程 ---------- */
.page-about .about-history .eyebrow,
.page-about .about-flow .eyebrow,
.page-about .about-rules .eyebrow {
  color: var(--slate);
}

.page-about .about-history .h-display,
.page-about .about-flow .h-display,
.page-about .about-rules .h-display {
  color: var(--ink-text);
}

.page-about .about-history .lead,
.page-about .about-flow .lead,
.page-about .about-rules .lead {
  color: var(--slate);
}

.page-about .archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 28px;
}

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

.page-about .archive__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .dossier {
  position: relative;
  background: var(--about-paper-soft);
  border: 1px solid var(--about-paper-line);
  border-left: 2px solid var(--blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: transform 260ms var(--ease), border-color 260ms var(--ease);
}

.page-about .archive__list > li:nth-child(2) .dossier {
  margin-left: 6px;
}

.page-about .archive__list > li:nth-child(3) .dossier {
  margin-left: 12px;
}

.page-about .archive__list > li:nth-child(4) .dossier {
  margin-left: 18px;
}

.page-about .dossier summary {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  grid-template-areas:
    "idx meta"
    "idx title";
  align-items: center;
  gap: 2px 14px;
  padding: 16px 16px 15px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .dossier__index {
  grid-area: idx;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--blue-line);
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--blue);
  align-self: start;
}

.page-about .dossier__meta {
  grid-area: meta;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .dossier__title {
  grid-area: title;
  margin: 0;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink-text);
}

.page-about .dossier__body {
  padding: 0 16px 18px 74px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

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

.page-about .dossier__points {
  margin: 0;
  padding-left: 16px;
  list-style: square;
}

.page-about .dossier__points li {
  margin-bottom: 6px;
}

.page-about .dossier[open] {
  border-left-color: var(--orange);
}

/* 里程碑横条 */
.page-about .milestones {
  margin-top: 32px;
  padding-bottom: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .milestones__track {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 2px 0;
  list-style: none;
  min-width: max-content;
}

.page-about .milestone {
  flex: 0 0 auto;
  width: 168px;
  padding: 14px 14px 16px;
  background: var(--ink);
  border: 1px solid var(--hairline);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.page-about .milestone__no {
  display: block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--blue);
}

.page-about .milestone__year {
  display: block;
  margin: 6px 0 4px;
  font-family: var(--font-data);
  font-size: 20px;
  color: var(--lime);
}

.page-about .milestone__note {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(244, 235, 223, 0.78);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 52px 0;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--haze);
}

.page-about .team-body h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 5.6vw, 40px);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .team-body > p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 235, 223, 0.82);
}

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

.page-about .roster__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2px 12px;
}

.page-about .roster__name {
  font-size: 14px;
  color: var(--paper);
}

.page-about .roster__num {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--lime);
}

.page-about .roster__bar {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  margin-top: 6px;
  background: rgba(244, 235, 223, 0.1);
}

.page-about .roster__bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--orange));
}

.page-about .team-note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--hairline);
  font-size: 14px;
  line-height: 1.75;
  color: var(--haze);
}

/* ---------- 校对流程 ---------- */
.page-about .flow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .flow {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  position: relative;
  padding: 0 0 22px 52px;
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 34px;
  bottom: 0;
  width: 1px;
  background: var(--about-paper-line);
}

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

.page-about .flow__step:last-child::before {
  display: none;
}

.page-about .flow__idx {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--blue);
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--blue);
  background: var(--paper);
}

.page-about .flow__name {
  margin: 4px 0 6px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 17px;
  color: var(--ink-text);
}

.page-about .flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .about-figure--tall {
  align-self: start;
}

/* ---------- 栏目与区域 ---------- */
.page-about .about-cover {
  padding: 52px 0;
}

.page-about .about-cover h2 {
  color: var(--paper);
}

.page-about .about-cover .lead {
  color: rgba(244, 235, 223, 0.82);
}

.page-about .topic-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.page-about .topic {
  position: relative;
  padding: 20px 18px 22px;
  background: linear-gradient(160deg, rgba(23, 162, 255, 0.08), transparent 70%), var(--steel);
  border: 1px solid var(--hairline);
  border-top: 2px solid var(--blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

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

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

.page-about .topic__no {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--haze);
}

.page-about .topic__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .topic__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 235, 223, 0.8);
}

.page-about .cover-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--hairline);
}

.page-about .cover-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.32;
  color: var(--paper);
}

.page-about .cover-text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 235, 223, 0.82);
}

.page-about .cover-text a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 准则 ---------- */
.page-about .rules {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rule {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 16px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--about-paper-line);
  transition: transform 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .rule__no {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--lime);
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--ink-text);
  background: rgba(182, 255, 61, 0.16);
  align-self: start;
}

.page-about .rule__title {
  margin: 4px 0 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 17px;
  color: var(--ink-text);
}

.page-about .rule__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .rule__example {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--blue);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 34px;
  padding: 22px 18px;
  background: var(--ink);
  border: 1px solid var(--hairline);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-cta__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(244, 235, 223, 0.86);
}

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

/* ---------- 移动端以上增强 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__frame {
    padding: 28px 32px 38px;
  }

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

  .page-about .about-fact {
    padding: 20px 18px;
  }

  .page-about .about-fact__num {
    font-size: 28px;
  }

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

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

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 26px 28px;
  }

  .page-about .about-cta__text {
    margin: 0;
    max-width: 52ch;
  }
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: 0.92fr 1.08fr;
    gap: 42px;
    align-items: start;
  }

  .page-about .flow-grid {
    grid-template-columns: 1.18fr 0.82fr;
    gap: 46px;
    align-items: start;
  }

  .page-about .cover-grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 40px;
    align-items: center;
  }

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

@media (min-width: 1000px) {
  .page-about .archive {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .archive__rail {
    display: block;
    position: sticky;
    top: 48px;
    padding-top: 6px;
  }

  .page-about .archive__rail-title {
    display: block;
    margin-bottom: 14px;
    font-family: var(--font-data);
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--slate);
  }

  .page-about .archive__scale {
    position: relative;
    margin: 0;
    padding: 0 0 0 14px;
    list-style: none;
  }

  .page-about .archive__scale::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, var(--blue), rgba(23, 162, 255, 0.1));
  }

  .page-about .archive__scale li {
    position: relative;
    padding: 0 0 34px;
  }

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

  .page-about .archive__dot {
    position: absolute;
    left: -14px;
    top: 5px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 3px rgba(23, 162, 255, 0.16);
  }

  .page-about .archive__tag {
    font-family: var(--font-data);
    font-size: 12px;
    letter-spacing: 0.06em;
    color: var(--slate);
  }

  .page-about .dossier:hover {
    transform: translate(8px, -3px);
    border-left-color: var(--orange);
  }

  .page-about .dossier__body {
    padding-right: 34px;
  }

  .page-about .milestone {
    width: 184px;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .rule__example {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 260ms var(--ease), opacity 260ms var(--ease), margin-top 260ms var(--ease);
  }

  .page-about .rule:hover .rule__example,
  .page-about .rule:focus-within .rule__example {
    max-height: 90px;
    margin-top: 8px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .dossier,
  .page-about .rule,
  .page-about .rule__example {
    transition: none;
  }

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