.page-about {
  --about-index-w: 172px;
  --about-gap: clamp(24px, 3.4vw, 56px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .breadcrumb {
  margin-top: clamp(16px, 2.4vw, 26px);
  font-size: 13px;
  color: var(--grey);
}

.page-about .breadcrumb a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .breadcrumb a:hover {
  color: var(--maple);
  border-bottom-color: var(--maple);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(18px, 2.6vw, 30px);
}

.page-about .about-index {
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
}

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

.page-about .about-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--maple);
}

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

.page-about .about-hero {
  padding-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-cond);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--fir);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(1.95rem, 5vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 19em;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  max-width: 32em;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 16px 20px;
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .hero-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.3vw, 1.7rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--fir-deep);
}

.page-about .hero-fact__unit {
  margin-left: 2px;
  font-family: var(--font-cn);
  font-size: 0.62em;
  font-weight: 500;
  color: var(--fir);
}

.page-about .hero-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .about-section {
  padding-top: clamp(20px, 3vw, 34px);
  padding-bottom: clamp(36px, 5vw, 64px);
  border-top: 1px solid var(--line);
}

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

.page-about .about-section .section-head {
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .about-body {
  max-width: 38em;
  margin-top: 18px;
}

.page-about .about-body p {
  margin: 0 0 1.1em;
  font-size: clamp(15px, 1.05vw, 16.5px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-body p:last-child {
  margin-bottom: 0;
}

.page-about .mark-line {
  margin: 0 0 clamp(16px, 2.2vw, 22px);
  padding-left: 14px;
  border-left: 3px solid var(--maple);
  font-size: clamp(16px, 1.5vw, 19px);
  font-weight: 700;
  line-height: 1.7;
  color: var(--ink);
  max-width: 30em;
}

/* 图片 */
.page-about .about-figure {
  margin: 0;
}

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

.page-about .about-figure figcaption {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--grey);
  max-width: 46em;
}

.page-about .about-figure--wide {
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-figure--inset {
  width: 100%;
  margin: clamp(24px, 3vw, 36px) 0 0 auto;
}

/* 场景 */
.page-about .scene-list {
  display: grid;
  gap: 0;
}

.page-about .scene {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 0 20px;
  border-top: 1px solid var(--line);
}

.page-about .scene:first-child {
  border-top-color: var(--line-strong);
}

.page-about .scene__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--maple);
  padding-top: 3px;
}

.page-about .scene__title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .scene__text {
  margin: 0;
  grid-column: 2;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .scene__tag {
  grid-column: 2;
  justify-self: start;
  margin-top: 8px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--fir);
  border: 1px solid rgba(31, 91, 78, 0.3);
  background: rgba(127, 182, 206, 0.1);
}

/* 主题 */
.page-about .topics-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 38px);
}

.page-about .topic-list {
  min-width: 0;
}

.page-about .topic {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 15px 0 17px;
  border-top: 1px solid var(--line);
}

.page-about .topic:first-child {
  border-top-color: var(--line-strong);
}

.page-about .topic__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fir);
  padding-top: 3px;
}

.page-about .topic__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .topic__text {
  margin: 4px 0 0;
  grid-column: 2;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .topic__form {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--grey);
  padding-top: 2px;
}

.page-about .about-figure--topics img {
  max-height: 300px;
}

/* 流程 */
.page-about .flow {
  display: grid;
  gap: 0;
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .flow__step {
  position: relative;
  padding: 14px 0 24px 22px;
  border-left: 1px solid var(--line-strong);
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 19px;
  width: 9px;
  height: 9px;
  background: var(--paper);
  border: 1px solid var(--maple);
}

.page-about .flow__step:first-child::before {
  background: var(--maple);
}

.page-about .flow__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--maple);
  margin-bottom: 6px;
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

/* 团队 */
.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .team-stat {
  padding: 18px 14px 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--maple);
}

.page-about .team-stat__unit {
  margin-left: 2px;
  font-family: var(--font-cn);
  font-size: 0.48em;
  font-weight: 500;
  color: var(--maple-deep);
}

.page-about .team-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--grey);
}

/* 版本档案 */
.page-about .versions {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .version {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px 24px;
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--line);
}

.page-about .version__no {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.4vw, 1.75rem);
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.2;
  color: var(--fir-deep);
}

.page-about .version__title {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

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

.page-about .version__adjust {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--grey);
}

.page-about .version--current {
  margin: 0 -12px;
  padding-left: 12px;
  padding-right: 12px;
  background: rgba(200, 50, 43, 0.055);
  border-left: 3px solid var(--maple);
}

.page-about .version--current .version__no {
  color: var(--maple);
}

/* 共建 */
.page-about .panel {
  margin-top: 14px;
}

.page-about .panel__body ul {
  margin: 0;
  padding: 0 0 0 4px;
  list-style: none;
}

.page-about .panel__body li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .panel__body li:last-child {
  margin-bottom: 0;
}

.page-about .panel__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 1px;
  background: var(--fir);
}

.page-about .panel__body strong {
  color: var(--ink);
  font-weight: 700;
}

.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .next-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: clamp(28px, 4vw, 42px);
  border-top: 1px solid var(--line-strong);
}

.page-about .next-link {
  display: block;
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
}

.page-about .next-link:hover .next-link__label,
.page-about .next-link:focus-visible .next-link__label {
  color: var(--maple);
}

.page-about .next-link__label {
  display: block;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .next-link__text {
  display: block;
  margin-top: 4px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--grey);
}

@media (min-width: 768px) {
  .page-about .about-figure--topics img {
    max-height: 380px;
  }

  .page-about .team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-stat {
    padding-right: 20px;
  }

  .page-about .version {
    grid-template-columns: 128px minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .version__adjust {
    padding-left: 18px;
    border-left: 1px solid var(--line);
  }

  .page-about .next-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .scene {
    grid-template-columns: 46px minmax(0, 1fr) 96px;
    gap: 4px 18px;
    padding: 20px 0 22px;
  }

  .page-about .scene__num {
    grid-row: 1 / span 3;
  }

  .page-about .scene__tag {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
    margin-top: 1px;
  }

  .page-about .scene:nth-child(even) {
    padding-left: clamp(0px, 4vw, 52px);
  }

  .page-about .topic {
    grid-template-columns: 48px minmax(0, 1fr) 150px;
    gap: 4px 18px;
    padding: 16px 0 18px;
  }

  .page-about .topic__num {
    grid-row: 1 / span 3;
  }

  .page-about .topic__form {
    grid-column: 3;
    grid-row: 1;
    text-align: right;
    padding-top: 3px;
  }
}

@media (min-width: 860px) {
  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 1px solid var(--line-strong);
  }

  .page-about .flow__step {
    padding: 28px 26px 0 0;
    border-left: 0;
  }

  .page-about .flow__step::before {
    left: 0;
    top: -5px;
  }

  .page-about .flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: -4.5px;
    right: -1px;
    width: 7px;
    height: 7px;
    border-top: 1px solid var(--maple);
    border-right: 1px solid var(--maple);
    transform: rotate(45deg);
  }

  .page-about .about-figure--inset {
    width: min(100%, 520px);
  }
}

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

  .page-about .about-index {
    position: sticky;
    top: calc(var(--notice-h) + 24px);
    align-self: start;
    border-top: 1px solid var(--line-strong);
    padding-bottom: 12px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    padding: 9px 0;
    border-bottom: 1px solid var(--line);
    white-space: normal;
  }

  .page-about .topics-wrap {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-figure--topics {
    position: sticky;
    top: calc(var(--notice-h) + 24px);
  }

  .page-about .about-figure--topics img {
    max-height: none;
  }
}