.page-about {
  --about-line: rgba(20, 102, 168, 0.32);
}

.page-about .about-hero {
  position: relative;
  padding: clamp(2rem, 5vw, 4rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
  background:
    radial-gradient(60% 80% at 88% 0%, rgba(20, 102, 168, 0.42), transparent 70%),
    radial-gradient(50% 70% at 0% 100%, rgba(255, 106, 26, 0.16), transparent 72%),
    linear-gradient(180deg, rgba(4, 16, 29, 0.92), rgba(7, 26, 47, 0.72));
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--orange) 35%, transparent 78%);
  opacity: 0.85;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 1.15rem;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange-300);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: #fff;
  text-wrap: balance;
}

.page-about .about-hero__title::first-line {
  color: var(--mist);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: #cfdcea;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0.75rem 0 0;
}

.page-about .about-hero__stats .stat {
  padding: 0.85rem 1rem;
  border: 1px solid rgba(244, 247, 250, 0.12);
  border-left: 2px solid var(--orange);
  border-radius: var(--radius);
  background: rgba(14, 46, 79, 0.42);
  backdrop-filter: blur(6px);
}

.page-about .about-hero__stats .stat__label {
  margin: 0 0 0.35rem;
  font-size: 0.8125rem;
  color: var(--gray);
  letter-spacing: 0.04em;
}

.page-about .about-hero__stats .stat__value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.7rem;
  line-height: 1;
  color: var(--green);
}

.page-about .stat__unit {
  margin-left: 0.15em;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--gray);
}

/* ---------- 两栏：索引 + 正文 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2rem, 5vw, 3.5rem) clamp(3rem, 7vw, 5rem);
}

.page-about .about-index {
  min-width: 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(14, 46, 79, 0.5);
}

.page-about .about-index__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-serif);
  font-size: 0.8125rem;
  letter-spacing: 0.22em;
  color: var(--orange-300);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.3rem 0;
  font-size: 0.875rem;
  color: #cfdcea;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: #fff;
  border-bottom-color: var(--orange);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--blue-500);
}

.page-about .about-body {
  min-width: 0;
  display: grid;
  gap: clamp(2.25rem, 5vw, 3.5rem);
}

/* ---------- 章节 ---------- */

.page-about .chapter {
  min-width: 0;
  display: grid;
  gap: 1.15rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(143, 163, 184, 0.2);
  scroll-margin-top: 5.5rem;
}

.page-about .chapter__head {
  display: grid;
  gap: 0.4rem;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--blue-500);
  letter-spacing: 0.02em;
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.2vw, 2.125rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .chapter__lead {
  margin: 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: #d7e3ef;
}

.page-about .chapter__note {
  margin: 0;
  padding: 0.9rem 1rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #c6d4e2;
  border-left: 2px solid var(--green);
  background: rgba(14, 46, 79, 0.38);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .chapter__note a {
  color: var(--orange-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .chapter .prose {
  display: grid;
  gap: 0.9rem;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: #cfdcea;
}

.page-about .chapter .prose p {
  margin: 0;
}

.page-about .chapter .prose p:first-child {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.9;
  color: #e6eef6;
}

.page-about .about-facts {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts li {
  padding: 0.65rem 0.85rem;
  font-size: 0.9063rem;
  line-height: 1.7;
  color: #cfdcea;
  background: rgba(14, 46, 79, 0.4);
  border-left: 2px solid var(--blue-500);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-facts strong {
  display: inline-block;
  margin-right: 0.4rem;
  color: var(--orange-300);
  font-weight: 700;
}

/* ---------- 图片 ---------- */

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

.page-about .figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(20, 102, 168, 0.35), rgba(4, 16, 29, 0.9));
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .figure:not(.figure--wide) .figure__media img {
  aspect-ratio: 10 / 7;
}

.page-about .figure__caption {
  margin-top: 0.6rem;
  font-family: var(--font-serif);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 周节奏 ---------- */

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

.page-about .cycle-card {
  min-width: 0;
  padding: 1.1rem 1.15rem;
  border: 1px solid rgba(244, 247, 250, 0.1);
  border-top: 2px solid var(--orange);
  border-radius: var(--radius);
  background: rgba(4, 16, 29, 0.55);
}

.page-about .cycle-card:nth-child(even) {
  border-top-color: var(--green);
  background: rgba(14, 46, 79, 0.5);
}

.page-about .cycle-card__day {
  margin: 0 0 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--orange-300);
}

.page-about .cycle-card__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 800;
  color: #fff;
}

.page-about .cycle-card p:last-child {
  margin: 0;
  font-size: 0.9063rem;
  line-height: 1.78;
  color: #bfd0e0;
}

/* ---------- 团队 ---------- */

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

.page-about .team-card {
  min-width: 0;
  padding: 1.1rem 1.15rem;
  border: 1px solid rgba(143, 163, 184, 0.22);
  border-radius: var(--radius);
  background: linear-gradient(170deg, rgba(14, 46, 79, 0.62), rgba(4, 16, 29, 0.5));
}

.page-about .team-card__name {
  margin: 0 0 0.55rem;
  padding-left: 0.6rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--mist);
  border-left: 3px solid var(--orange);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: #bfd0e0;
}

/* ---------- 原则 ---------- */

.page-about .principles {
  display: grid;
  gap: 0.6rem;
}

.page-about .principle {
  border: 1px solid rgba(143, 163, 184, 0.22);
  border-radius: var(--radius);
  background: rgba(14, 46, 79, 0.42);
  overflow: hidden;
}

.page-about .principle[open] {
  border-left: 3px solid var(--orange);
  background: rgba(4, 16, 29, 0.62);
}

.page-about .principle__summary {
  cursor: pointer;
  padding: 0.9rem 2.4rem 0.9rem 1rem;
  position: relative;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--mist);
  list-style: none;
}

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

.page-about .principle__summary::after {
  content: "+";
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--orange);
}

.page-about .principle[open] .principle__summary::after {
  content: "–";
}

.page-about .principle__summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -2px;
}

.page-about .principle__body {
  padding: 0 1rem 1rem;
}

.page-about .principle__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: #c6d4e2;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  position: relative;
  display: grid;
  gap: 1.1rem;
  margin: 0;
  padding: 0 0 0 1.15rem;
  list-style: none;
  border-left: 1px solid rgba(20, 102, 168, 0.5);
}

.page-about .timeline__item {
  position: relative;
  min-width: 0;
  scroll-margin-top: 5.5rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.15rem - 5px);
  top: 1.15rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-700);
  border: 1px solid var(--orange);
}

.page-about .timeline__item:target::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.22);
}

.page-about .timeline__year {
  display: inline-block;
  margin-bottom: 0.35rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--orange-300);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.page-about .timeline__item:target .timeline__year {
  color: var(--green);
}

.page-about .timeline__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.0313rem;
  font-weight: 800;
  color: #fff;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: #bfd0e0;
}

/* ---------- 补充与收束 ---------- */

.page-about .about-extra {
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(14, 46, 79, 0.45);
}

.page-about .about-extra__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  letter-spacing: 0.04em;
  color: var(--orange-300);
}

.page-about .about-extra p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: #c6d4e2;
}

.page-about .about-cta {
  display: grid;
  gap: 0.9rem;
  padding: clamp(1.15rem, 3vw, 1.75rem);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 106, 26, 0.35);
  background:
    linear-gradient(120deg, rgba(255, 106, 26, 0.18), rgba(4, 16, 29, 0.7) 55%),
    rgba(4, 16, 29, 0.8);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: #e0eaf3;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 6rem;
    padding: 1.25rem 1.15rem;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 0.15rem;
  }

  .page-about .about-index__link {
    display: flex;
    padding: 0.45rem 0;
    border-bottom: 1px solid rgba(143, 163, 184, 0.16);
  }

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

  .page-about .chapter {
    padding-top: 1.75rem;
  }

  .page-about .chapter__num {
    font-size: 3.5rem;
  }

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

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

  .page-about .timeline {
    padding-left: 7.5rem;
  }

  .page-about .timeline__item::before {
    left: calc(-7.5rem - 5px);
    top: 1.35rem;
  }

  .page-about .timeline__year {
    position: absolute;
    left: -7.5rem;
    top: 0.85rem;
    width: 6rem;
    text-align: right;
    margin: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link {
    transition: none;
  }
}
<<<END>>>