.page-about {
  --about-rail: 108px;
  background: var(--ink);
  color: var(--white);
  padding: 0 0 76px;
}

.page-about .about-head {
  padding-top: 26px;
  padding-bottom: 10px;
}

.page-about .sk-breadcrumb {
  margin-bottom: 34px;
}

.page-about .sk-breadcrumb__link,
.page-about .sk-breadcrumb__sep,
.page-about .sk-breadcrumb__current {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .sk-breadcrumb__link {
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .sk-breadcrumb__link:hover,
.page-about .sk-breadcrumb__link:focus-visible {
  color: var(--cyan);
}

/* 首屏：左窄右宽 */
.page-about .about-intro {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-intro__rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-since {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

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

.page-about .about-intro__title {
  margin: 0 0 20px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.03em;
  font-stretch: 90%;
  color: var(--white);
  overflow-wrap: break-word;
}

.page-about .about-intro__lede {
  max-width: 58ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-facts {
  display: grid;
  gap: 12px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts li {
  border: 2px solid var(--line);
  background: var(--panel);
  padding: 16px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-facts li > span {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
}

/* 章节骨架 */
.page-about .about-section {
  padding: 52px 0;
  border-top: 2px solid var(--line);
  scroll-margin-top: 92px;
}

.page-about .about-section__inner {
  display: grid;
  gap: 18px;
}

.page-about .about-section__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-section__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .sk-section__title {
  margin: 0 0 18px;
  font-size: clamp(25px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-section__body > p {
  max-width: 64ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .about-section__body a:hover,
.page-about .about-section__body a:focus-visible {
  color: var(--white);
}

/* 图像 */
.page-about .about-figure {
  max-width: 100%;
  margin: 26px 0 0;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--hard);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.02);
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-size: 12px;
  line-height: 1.65;
  color: var(--muted);
}

/* 编辑流程折叠 */
.page-about .about-step {
  max-width: 64ch;
  margin-bottom: 10px;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-step summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .about-step[open] summary {
  background: var(--ink-deep);
  border-bottom: 2px solid var(--line);
}

.page-about .about-step p {
  margin: 0;
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* 项目标签 */
.page-about .about-projects {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 16px;
  padding: 0;
  list-style: none;
}

.page-about .about-projects li {
  border: 2px solid var(--line);
  background: var(--panel);
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--white);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-projects li:hover {
  border-color: var(--cyan);
  background: var(--ink-deep);
  color: var(--cyan);
}

.page-about .about-projects__note {
  max-width: 64ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* 数字统计块 */
.page-about .about-numbers {
  display: grid;
  gap: 12px;
  margin: 26px 0;
}

.page-about .about-numbers__item {
  border: 2px solid var(--paper-2);
  background: var(--paper);
  color: var(--ink);
  padding: 18px;
  box-shadow: var(--hard);
}

.page-about .about-numbers__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--orange-deep);
}

.page-about .about-numbers__label {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--panel);
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(var(--cyan), var(--orange));
}

.page-about .about-timeline li {
  position: relative;
  padding: 0 0 26px 34px;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cyan);
  background: var(--ink);
}

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

.page-about .about-timeline li:last-child::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-timeline h3 {
  margin: 6px 0 8px;
  font-size: 19px;
  font-weight: 900;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-timeline p {
  max-width: 60ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* 联系卡片 */
.page-about .about-cta {
  margin-top: 36px;
  padding: 26px 22px;
  border: 2px solid var(--ink-deep);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--hard);
}

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

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(21px, 3.8vw, 30px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-cta__text {
  max-width: 56ch;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--panel);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 平板与桌面 */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-cta {
    padding: 32px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-intro {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-intro__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: sticky;
    top: 96px;
  }

  .page-about .about-jump {
    display: grid;
    gap: 2px;
    width: 100%;
    padding-top: 14px;
    border-top: 2px solid var(--line);
  }

  .page-about .about-jump a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 7px 8px 7px 0;
    font-size: 13px;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.18s var(--ease), padding-left 0.18s var(--ease);
  }

  .page-about .about-jump a .sk-mono {
    font-size: 11px;
    color: var(--line);
    transition: color 0.18s var(--ease);
  }

  .page-about .about-jump a:hover,
  .page-about .about-jump a:focus-visible {
    color: var(--white);
    padding-left: 4px;
  }

  .page-about .about-jump a:hover .sk-mono,
  .page-about .about-jump a:focus-visible .sk-mono {
    color: var(--cyan);
  }

  .page-about .about-intro__lede {
    font-size: 18px;
  }

  .page-about .about-section {
    padding: 66px 0;
  }

  .page-about .about-section__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-section__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    position: sticky;
    top: 96px;
  }

  .page-about .about-section__num {
    font-size: 42px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-numbers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}
<<<END>>>