.page-about {
  --about-line: rgba(43, 227, 196, 0.16);
  --paper-accent: #0E6E5C;
  --paper-hair: rgba(22, 33, 28, 0.16);
  padding-bottom: 88px;
}

.page-about a {
  color: inherit;
}

/* ---------- 框景首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 18px;
  padding: 26px 20px 30px;
  border: 1px solid var(--cyan-line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 110% at 0% 0%, rgba(23, 57, 46, 0.9), rgba(10, 26, 21, 0.15) 72%);
  display: grid;
  gap: 28px;
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--cyan);
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--radius-l);
}

.page-about .about-hero::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
  border-bottom-right-radius: var(--radius-l);
}

.page-about .about-hero__text {
  min-width: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 8vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 52ch;
  color: rgba(242, 247, 244, 0.86);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
}

.page-about .about-hero__facts li {
  display: grid;
  gap: 2px;
}

.page-about .about-hero__num {
  font-size: 1.6rem;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-hero__lbl {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-hero__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
  object-fit: cover;
  border: 1px solid var(--about-line);
}

.page-about .about-hero__media figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell {
  margin-top: 60px;
  display: grid;
  gap: 34px;
}

.page-about .about-index {
  border-top: 1px solid var(--about-line);
  padding-top: 16px;
  min-width: 0;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__list a {
  display: block;
  white-space: nowrap;
  padding: 7px 14px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan-line);
}

.page-about .about-body {
  display: grid;
  gap: 64px;
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .about-section .eyebrow {
  color: var(--cyan);
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 5.2vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
}

.page-about .about-section__lede {
  margin: 14px 0 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-about .about-section p {
  line-height: 1.85;
}

.page-about .about-section .measure p {
  color: rgba(242, 247, 244, 0.88);
  font-size: 1rem;
}

.page-about .about-section .measure p + p {
  margin-top: 16px;
}

.page-about .about-section__note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--cyan-line);
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------- 暖纸色阅读区 ---------- */
.page-about .about-section--paper {
  position: relative;
  background: var(--paper);
  color: var(--paper-ink);
  border-radius: var(--radius-l);
  padding: 32px 20px 36px;
}

.page-about .about-section--paper::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -22px;
  height: 22px;
  background-image: repeating-linear-gradient(90deg, rgba(43, 227, 196, 0.34) 0 1px, transparent 1px 14px);
  pointer-events: none;
}

.page-about .about-section--paper .eyebrow {
  color: var(--paper-accent);
}

.page-about .about-section--paper .about-section__lede {
  color: var(--paper-muted);
}

.page-about .about-section--paper a {
  color: var(--paper-accent);
  text-underline-offset: 3px;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(43, 227, 196, 0.14) 72%, transparent);
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 227, 196, 0.12);
}

.page-about .tl-item--start::before {
  background: var(--yellow);
  box-shadow: 0 0 0 4px rgba(245, 197, 66, 0.14);
}

.page-about .tl-card {
  background: var(--ink-1);
  border: 1px solid var(--about-line);
  border-radius: 16px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .tl-card[open] {
  background: var(--ink-2);
  border-color: var(--cyan-line);
}

.page-about .tl-card summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 15px 46px 15px 16px;
  display: grid;
  gap: 5px;
}

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

.page-about .tl-card summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 13px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .tl-card[open] summary::after {
  content: "−";
}

.page-about .tl-card summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 16px;
}

.page-about .tl-stage {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--yellow);
}

.page-about .tl-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-about .tl-body {
  padding: 0 16px 16px;
  color: var(--muted);
  font-size: 0.92rem;
}

.page-about .tl-body p {
  margin: 0;
}

/* ---------- 内嵌图片 ---------- */
.page-about .about-inline-media {
  margin: 28px 0 0;
}

.page-about .about-inline-media figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

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

/* ---------- 团队条带 ---------- */
.page-about .team-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: 5px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 18px;
  border-radius: 16px;
  background: rgba(16, 42, 34, 0.05);
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .team-item:hover,
.page-about .team-item:focus-within {
  background: rgba(16, 42, 34, 0.1);
  transform: translateX(3px);
}

.page-about .team-item__bar {
  display: block;
  background: var(--ink-2);
  border-radius: 999px;
  transition: background 0.25s var(--ease);
}

.page-about .team-item:hover .team-item__bar {
  background: var(--paper-accent);
}

.page-about .team-item h3 {
  margin: 0 0 5px;
  font-size: 0.99rem;
  font-weight: 700;
  color: var(--paper-ink);
}

.page-about .team-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--paper-muted);
}

/* ---------- 流程步骤 ---------- */
.page-about .steps {
  list-style: none;
  counter-reset: about-step;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .steps li {
  counter-increment: about-step;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
}

.page-about .steps li::before {
  content: counter(about-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--yellow);
  padding-top: 2px;
}

.page-about .steps strong {
  display: block;
  font-size: 0.98rem;
  margin-bottom: 5px;
  color: var(--text);
}

.page-about .steps p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 信息表 ---------- */
.page-about .facts-table {
  margin: 26px 0 0;
  border-top: 1px solid var(--paper-hair);
}

.page-about .facts-row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--paper-hair);
}

.page-about .facts-row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--paper-muted);
}

.page-about .facts-row dd {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  margin: 26px 0 0;
  display: grid;
  gap: 18px;
}

.page-about .partner-cell {
  padding-left: 16px;
  border-left: 2px solid var(--cyan-line);
}

.page-about .partner-cell__num {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .partner-cell__text {
  margin: 8px 0 0;
  font-size: 0.92rem;
  color: var(--muted);
}

/* ---------- 路线图 ---------- */
.page-about .roadmap {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .roadmap li {
  border: 1px solid var(--about-line);
  border-radius: var(--radius-l);
  padding: 22px 20px;
  background: var(--ink-1);
  transition: border-color 0.2s var(--ease);
}

.page-about .roadmap li:hover {
  border-color: var(--cyan-line);
}

.page-about .roadmap__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .roadmap h3 {
  margin: 10px 0 8px;
  font-size: 1rem;
  line-height: 1.5;
}

.page-about .roadmap p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 路径卡 ---------- */
.page-about .about-paths {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-paths a {
  display: grid;
  gap: 3px;
  padding: 16px 20px;
  border: 1px solid var(--about-line);
  border-radius: 18px;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-paths a:hover,
.page-about .about-paths a:focus-visible {
  border-color: var(--cyan-line);
  background: var(--cyan-soft);
  transform: translateY(-2px);
}

.page-about .about-paths strong {
  font-size: 0.97rem;
  font-weight: 700;
}

.page-about .about-paths span {
  font-size: 0.82rem;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-section__lede,
  .page-about .about-section .measure p {
    font-size: 1.02rem;
  }

  .page-about .facts-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 40px 46px;
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-section--paper {
    padding: 46px 40px 50px;
  }

  .page-about .about-body {
    gap: 88px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-index__list a {
    white-space: normal;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 10px 10px 0;
    padding: 8px 12px;
    font-size: 13.5px;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--cyan);
    background: var(--cyan-soft);
    color: var(--text);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-item,
  .page-about .about-paths a,
  .page-about .tl-card,
  .page-about .roadmap li {
    transition: none;
  }

  .page-about .team-item:hover,
  .page-about .about-paths a:hover {
    transform: none;
  }
}
<<<END>>>