.page-about {
  --about-line: rgba(11, 31, 58, 0.14);
  --about-line-soft: rgba(11, 31, 58, 0.07);
  --about-shadow: 0 18px 40px -28px rgba(11, 31, 58, 0.55);
  background: var(--warm);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-crumb {
  padding-top: 16px;
  padding-bottom: 16px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: var(--navy);
  color: var(--warm);
  padding: clamp(36px, 7vw, 84px) 0 clamp(48px, 8vw, 104px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    repeating-linear-gradient(90deg, rgba(201, 209, 218, 0.07) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(0deg, rgba(201, 209, 218, 0.05) 0 1px, transparent 1px 84px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: -34%;
  width: 66%;
  height: 168%;
  z-index: -1;
  background: linear-gradient(152deg, rgba(255, 107, 44, 0.24), rgba(79, 174, 159, 0.12) 54%, transparent 78%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: end;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 12px 0 18px;
  max-width: 16em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 40em;
  color: var(--mist);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

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

.page-about .about-hero__actions .btn--ghost {
  color: var(--warm);
  border-color: var(--line-strong);
}

.page-about .about-hero__card {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(247, 244, 238, 0.07);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  padding: clamp(18px, 3vw, 28px);
}

.page-about .about-hero__card .mono-label {
  color: var(--orange);
  letter-spacing: 0.14em;
  font-size: 12px;
  margin: 0;
}

.page-about .about-facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .about-facts li {
  border-top: 1px solid var(--line-strong);
  padding-top: 10px;
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-facts__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-hero__note {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(46px, 7vw, 88px) 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-chapter--cream {
  background: var(--cream);
}

.page-about .about-chapter__head {
  display: grid;
  gap: 10px;
}

.page-about .about-chapter__no {
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 72px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  margin: 0;
  max-width: 22em;
}

.page-about .about-chapter__intro {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--rock);
  max-width: 44em;
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(24px, 4vw, 36px);
}

.page-about .about-figure img {
  width: 100%;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  object-fit: cover;
  background: var(--midnight);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--rock);
}

/* ---------- 年份轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange), rgba(11, 31, 58, 0.16) 32%, rgba(11, 31, 58, 0.16) 68%, var(--celadon));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 11px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--warm);
  border: 2px solid var(--orange);
}

.page-about .about-chapter--cream .about-timeline__item::before {
  background: var(--cream);
}

.page-about .about-timeline__item:nth-child(even)::before {
  border-color: var(--celadon);
}

.page-about .about-timeline__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--navy);
}

.page-about .about-timeline__card {
  background: var(--warm);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  padding: 16px 18px 18px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-chapter--cream .about-timeline__card {
  background: var(--paper);
}

.page-about .about-timeline__item:nth-child(even) .about-timeline__card {
  border-left-color: var(--celadon);
}

.page-about .about-timeline__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--about-shadow);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  margin: 8px 0 6px;
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--rock);
}

/* ---------- 折叠面板 ---------- */
.page-about .about-details {
  display: grid;
  gap: 10px;
}

.page-about .about-details__item {
  background: var(--warm);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  transition: border-color 0.2s ease;
}

.page-about .about-chapter--cream .about-details__item {
  background: var(--paper);
}

.page-about .about-details__item[open] {
  border-color: rgba(255, 107, 44, 0.55);
}

.page-about .about-details__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  list-style: none;
  cursor: pointer;
  padding: 14px 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.5;
}

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

.page-about .about-details__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-details__item[open] .about-details__summary::after {
  content: "−";
}

.page-about .about-details__idx {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--rock);
  letter-spacing: 0.04em;
}

.page-about .about-details__body {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--rock);
}

/* ---------- 六个栏目 ---------- */
.page-about .about-columns {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 36px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px 20px;
}

.page-about .about-columns__item {
  border-top: 2px solid var(--navy);
  padding-top: 12px;
  min-width: 0;
}

.page-about .about-columns__no {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-columns__name {
  display: block;
  margin: 4px 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
}

.page-about .about-columns__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 体系对照行 ---------- */
.page-about .about-compat {
  margin-bottom: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-compat__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px 16px;
  align-items: start;
  padding: 14px 2px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-compat__name {
  margin: 0 0 2px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
}

.page-about .about-compat__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-compat__row .tag {
  white-space: nowrap;
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-partners__item {
  background: var(--warm);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.page-about .about-partners__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--navy);
}

.page-about .about-partners__label {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .about-honors {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-honor {
  border-left: 3px solid var(--celadon);
  padding: 4px 0 4px 16px;
}

.page-about .about-honor__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--moss);
}

.page-about .about-honor__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.55;
  margin: 4px 0 4px;
}

.page-about .about-honor__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .about-more {
  margin: 24px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--rock);
}

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

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px 20px;
  align-items: center;
  padding: 20px 22px;
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--orange);
  border-radius: var(--radius);
  background: var(--cream);
}

.page-about .about-coverage__big {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(44px, 9vw, 88px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--navy);
}

.page-about .about-coverage__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-scenarios {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-scenario {
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 16px 18px 18px;
  background: var(--warm);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-scenario:hover {
  border-color: rgba(255, 107, 44, 0.55);
  transform: translateY(-2px);
}

.page-about .about-scenario__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
}

.page-about .about-scenario__desc {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--rock);
}

.page-about .about-scenario__link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-about .about-scenario__link:hover {
  color: var(--navy);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--navy);
  color: var(--warm);
  padding: clamp(40px, 6vw, 76px) 0;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  margin: 10px 0 0;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(247, 244, 238, 0.04);
  color: var(--warm);
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(255, 107, 44, 0.14);
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-next__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-next__link .about-next__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  margin: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-honors {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-hero__card {
    align-self: end;
  }

  .page-about .about-chapter__head {
    grid-template-columns: 104px minmax(0, 1fr) minmax(0, 0.92fr);
    column-gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-chapter__no {
    grid-row: 1 / span 2;
  }

  .page-about .about-chapter__title {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-chapter__intro {
    grid-column: 3;
    grid-row: 1;
    padding-top: 6px;
  }

  .page-about .about-timeline {
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    left: 116px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 48px);
    padding-bottom: 30px;
  }

  .page-about .about-timeline__item::before {
    left: 112px;
    top: 12px;
  }

  .page-about .about-timeline__year {
    text-align: right;
    margin: 0;
    padding-top: 2px;
  }

  .page-about .about-timeline__card {
    max-width: 600px;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__card {
    margin-left: clamp(20px, 4vw, 56px);
  }

  .page-about .about-coverage {
    grid-template-columns: auto minmax(0, 1fr);
    padding: 26px 30px;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    max-width: 14em;
  }

  .page-about .about-compat__row {
    grid-template-columns: minmax(0, 1fr) 160px;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-scenario,
  .page-about .about-next__link,
  .page-about .about-details__item {
    transition: none;
  }

  .page-about .about-timeline__card:hover,
  .page-about .about-scenario:hover,
  .page-about .about-next__link:hover {
    transform: none;
  }
}
<<<END>>>