.page-about {
  --about-frame-line: rgba(143, 163, 196, 0.22);
  --about-paper-line: rgba(23, 18, 12, 0.16);
  --about-gap: clamp(22px, 3.4vw, 42px);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--about-frame-line);
  border-radius: var(--r-lg);
  padding: clamp(26px, 4.4vw, 56px) clamp(20px, 4vw, 50px);
  background:
    radial-gradient(circle at 86% 10%, var(--cyan-dim), transparent 58%),
    radial-gradient(circle at 4% 96%, rgba(200, 69, 43, 0.14), transparent 52%),
    linear-gradient(158deg, var(--c-panel) 0%, var(--c-deep) 68%);
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px dashed rgba(143, 163, 196, 0.16);
  border-radius: calc(var(--r-lg) - 7px);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(20px, 4vw, 50px);
  right: clamp(20px, 4vw, 50px);
  height: 7px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(53, 242, 208, 0.5) 0 1px,
    transparent 1px 20px
  );
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(250px, 0.85fr);
    align-items: end;
  }
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: var(--t-17);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-about .about-hero__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__facts {
  border-top: 2px solid var(--c-brick);
  padding-top: 16px;
}

.page-about .about-hero__facts-title {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-amber);
}

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

.page-about .fact {
  display: grid;
  grid-template-columns: minmax(80px, auto) 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-frame-line);
}

.page-about .fact:last-child {
  border-bottom: 0;
}

.page-about .fact__num {
  font-size: var(--t-28);
  line-height: 1.1;
  color: var(--c-cyan);
  letter-spacing: -0.01em;
}

.page-about .fact__num em {
  font-style: normal;
  font-size: 0.56em;
  margin-left: 2px;
  color: var(--c-amber);
}

.page-about .fact__text {
  font-size: var(--t-14);
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 版本沿革 ---------- */
.page-about .about-era__layout {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

@media (min-width: 1024px) {
  .page-about .about-era__layout {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    align-items: start;
  }

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

.page-about .about-era__index {
  border-left: 2px solid rgba(53, 242, 208, 0.28);
  padding-left: 18px;
}

.page-about .about-era__index-title {
  margin: 0 0 14px;
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-amber);
}

.page-about .era-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .era-index__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: var(--t-14);
  color: var(--c-mist);
  transition: color 0.2s ease, transform 0.2s ease;
}

.page-about .era-index__item:hover {
  color: var(--c-cyan);
  transform: translateX(3px);
}

.page-about .era-index__no {
  font-size: var(--t-14);
  color: var(--c-brick);
  min-width: 1.4em;
}

.page-about .era-index__item--now {
  color: var(--c-bright);
}

.page-about .era-index__item--now .era-index__no {
  color: var(--c-cyan);
}

.page-about .era-index__note {
  margin: 18px 0 0;
  font-size: var(--t-12);
  line-height: 1.8;
  color: var(--c-mist);
  opacity: 0.78;
}

.page-about .about-era__intro {
  max-width: 68ch;
}

.page-about .about-era__intro p {
  margin: 14px 0 0;
  font-size: var(--t-17);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-about .about-era__media {
  margin: clamp(24px, 3.4vw, 38px) 0;
}

.page-about .era-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  position: relative;
}

.page-about .era-track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    var(--c-cyan) 0%,
    var(--c-teal) 55%,
    rgba(255, 165, 59, 0.55) 100%
  );
}

.page-about .era-node {
  position: relative;
  padding-bottom: clamp(24px, 3vw, 34px);
}

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

.page-about .era-node::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--c-cyan);
  background: var(--c-deep);
  box-shadow: 0 0 0 5px rgba(53, 242, 208, 0.1);
  transition: box-shadow 0.25s ease, background 0.25s ease;
}

.page-about .era-node--now::before {
  background: var(--c-cyan);
  box-shadow: 0 0 0 7px rgba(53, 242, 208, 0.18);
}

.page-about .era-node:hover::before {
  box-shadow: 0 0 0 8px rgba(53, 242, 208, 0.18);
}

.page-about .era-node__content {
  border-radius: var(--r-md);
  padding: 14px 18px;
  background: rgba(18, 36, 74, 0.55);
  border: 1px solid var(--line-soft);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .era-node:hover .era-node__content {
  border-color: rgba(53, 242, 208, 0.45);
  transform: translateY(-2px);
}

.page-about .era-node__title {
  margin: 0 0 8px;
  color: var(--c-bright);
}

.page-about .era-node__content p {
  margin: 0;
  font-size: var(--t-17);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-about .era-node__more {
  margin-top: 12px !important;
  padding-left: 12px;
  border-left: 2px solid rgba(200, 69, 43, 0.7);
  font-size: var(--t-14) !important;
  color: var(--c-mist);
  opacity: 0.85;
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .era-node__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0 !important;
    transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
  }

  .page-about .era-node:hover .era-node__more,
  .page-about .era-node:focus-within .era-node__more {
    max-height: 160px;
    opacity: 0.85;
    margin-top: 12px !important;
  }
}

/* ---------- 资料流程 ---------- */
.page-about .about-flow__grid {
  display: grid;
  gap: clamp(28px, 4vw, 50px);
}

@media (min-width: 980px) {
  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }
}

.page-about .about-flow__copy > p {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: var(--t-17);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-about .flow-steps {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-frame-line);
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-frame-line);
}

.page-about .flow-step__no {
  font-size: var(--t-14);
  color: var(--c-amber);
  padding-top: 4px;
  letter-spacing: 0.06em;
}

.page-about .flow-step__title {
  margin: 0 0 6px;
  font-size: var(--t-21);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--c-bright);
}

.page-about .flow-step p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.8;
  color: var(--c-mist);
}

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

/* ---------- 团队（奶油纸面板） ---------- */
.page-about .about-team__panel {
  border-radius: var(--r-lg);
  padding: clamp(24px, 4vw, 52px);
  background-image:
    repeating-linear-gradient(
      0deg,
      rgba(23, 18, 12, 0.035) 0 1px,
      transparent 1px 28px
    );
}

.page-about .about-team__chapter {
  margin: 0 0 10px;
  font-size: var(--t-12);
  letter-spacing: 0.14em;
  color: var(--c-brick);
  text-transform: uppercase;
}

.page-about .about-team__lead {
  margin: 18px 0 0;
  max-width: 72ch;
  font-size: var(--t-17);
  line-height: var(--lh-body);
}

.page-about .about-team__media {
  margin: clamp(22px, 3vw, 34px) 0;
}

.page-about .about-team__list {
  display: grid;
  gap: 12px;
  border-top: 2px solid var(--c-ink);
  padding-top: 20px;
}

.page-about .team-card {
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.42);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .team-card[open] {
  background: rgba(255, 255, 255, 0.68);
  border-color: rgba(200, 69, 43, 0.5);
}

.page-about .team-card__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px 16px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .team-card__summary::-webkit-details-marker {
  display: none;
}

.page-about .team-card__summary::after {
  content: "＋";
  grid-column: 3;
  font-size: var(--t-21);
  line-height: 1;
  color: var(--c-brick);
}

.page-about .team-card[open] .team-card__summary::after {
  content: "－";
}

.page-about .team-card__no {
  font-size: var(--t-14);
  color: var(--c-brick);
  letter-spacing: 0.06em;
}

.page-about .team-card__name {
  font-size: var(--t-21);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .team-card__tag {
  grid-column: 2 / 3;
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.06em;
  color: rgba(23, 18, 12, 0.55);
}

@media (min-width: 720px) {
  .page-about .team-card__summary {
    grid-template-columns: auto auto 1fr auto;
  }

  .page-about .team-card__tag {
    grid-column: 3;
    justify-self: end;
  }

  .page-about .team-card__summary::after {
    grid-column: 4;
  }
}

.page-about .team-card__body {
  padding: 0 18px 18px;
  border-top: 1px dashed var(--about-paper-line);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .team-card__body p {
  margin: 0;
  max-width: 72ch;
  font-size: var(--t-17);
  line-height: var(--lh-body);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage__head {
  max-width: 68ch;
}

.page-about .about-coverage__head p {
  margin: 14px 0 0;
  font-size: var(--t-17);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-about .about-coverage__grid {
  margin-top: clamp(24px, 3.4vw, 38px);
  display: grid;
  gap: clamp(22px, 3vw, 32px);
}

@media (min-width: 900px) {
  .page-about .about-coverage__grid {
    grid-template-columns: 320px minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-coverage__panel {
  border-radius: var(--r-md);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .coverage-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .coverage-stats__item {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-frame-line);
}

.page-about .coverage-stats__item:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .coverage-stats__num {
  font-size: var(--t-34);
  line-height: 1.05;
  color: var(--c-cyan);
  letter-spacing: -0.02em;
}

.page-about .coverage-stats__label {
  font-size: var(--t-14);
  color: var(--c-mist);
}

.page-about .coverage-stats__note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-frame-line);
  font-size: var(--t-12);
  line-height: 1.8;
  color: var(--c-mist);
  opacity: 0.82;
}

.page-about .coverage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

@media (min-width: 720px) {
  .page-about .coverage-list {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}

.page-about .coverage-item {
  padding: 20px 20px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: linear-gradient(150deg, rgba(18, 36, 74, 0.85), rgba(10, 23, 48, 0.7));
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .coverage-item:hover {
  border-color: rgba(53, 242, 208, 0.45);
  transform: translateY(-2px);
}

.page-about .coverage-item__title {
  margin: 0 0 8px;
  color: var(--c-bright);
}

.page-about .coverage-item p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.85;
  color: var(--c-mist);
}

/* ---------- 内容合作 ---------- */
.page-about .about-collab__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
}

@media (min-width: 940px) {
  .page-about .about-collab__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

.page-about .about-collab__copy p {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: var(--t-17);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-about .about-collab__copy .btn {
  margin-top: 24px;
}

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

.page-about .collab-item {
  padding: 20px 22px;
  border-left: 2px solid var(--c-brick);
  background: rgba(18, 36, 74, 0.48);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.page-about .collab-item__title {
  margin: 0 0 8px;
  color: var(--c-bright);
}

.page-about .collab-item p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.85;
  color: var(--c-mist);
}

/* ---------- 收束 ---------- */
.page-about .about-close__inner {
  border: 1px solid var(--about-frame-line);
  border-radius: var(--r-lg);
  padding: clamp(26px, 4vw, 48px);
  background:
    radial-gradient(circle at 92% 8%, rgba(255, 165, 59, 0.14), transparent 55%),
    linear-gradient(160deg, rgba(18, 36, 74, 0.9), rgba(10, 23, 48, 0.96));
}

.page-about .about-close__inner p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: var(--t-17);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-about .about-close__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 480px) {
  .page-about .fact {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .page-about .flow-step {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .page-about .hero-timeline {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .era-node__content,
  .page-about .coverage-item,
  .page-about .era-index__item {
    transition: none;
  }
}
<<<END>>>