.page-about {
  --about-line: #16384F;
  --about-body: #C3D6E0;
  --about-dim: #7E97A8;
  background: var(--deep);
  color: var(--ice);
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 1.2em;
}

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

/* 面包屑 */
.page-about .about-crumb {
  padding-top: 18px;
  padding-bottom: 4px;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--about-dim);
}

.page-about .breadcrumb a {
  color: var(--about-dim);
  text-decoration: none;
}

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

/* 首屏 */
.page-about .about-hero {
  padding: 20px 0 44px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about h1 {
  margin: 0 0 20px;
  font-size: clamp(2rem, 5.2vw, 3.35rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 700;
  max-width: 16em;
}

.page-about .about-hero__text {
  font-size: var(--fs-base);
  line-height: 1.8;
  color: var(--about-body);
  max-width: 34em;
  margin-bottom: 26px;
}

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

.page-about .about-hero__panel {
  position: relative;
  border: 1px solid var(--about-line);
  background: linear-gradient(155deg, var(--navy) 0%, var(--well) 100%);
  padding: 22px 20px 18px;
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 64px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-hero__panel-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  color: var(--about-dim);
}

.page-about .about-facts {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--about-line);
}

.page-about .about-facts > div {
  background: var(--deep);
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-facts dt {
  font-size: var(--fs-xs);
  color: var(--about-dim);
  letter-spacing: 0.02em;
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-base);
  color: var(--ice);
}

.page-about .about-facts .num {
  font-size: var(--fs-xl);
  color: var(--cyan);
  font-weight: 700;
}

.page-about .about-hero__panel-note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--about-dim);
  letter-spacing: 0.04em;
}

/* 章节骨架 */
.page-about .about-chapter {
  padding: 52px 0;
}

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

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

.page-about .about-chapter__head {
  position: relative;
  padding-left: 20px;
  border-left: 1px solid var(--about-line);
  margin-bottom: 26px;
}

.page-about .about-chapter__head::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 5px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
}

.page-about .about-chapter__mark {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .chapter__note {
  writing-mode: vertical-rl;
  font-size: var(--fs-xs);
  letter-spacing: 0.24em;
  color: var(--about-dim);
  line-height: 1;
}

.page-about .about-chapter h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
  font-weight: 700;
  max-width: 20em;
}

.page-about .about-prose {
  font-size: var(--fs-base);
  line-height: 1.8;
  color: var(--about-body);
  max-width: 40em;
}

.page-about .about-prose--after {
  margin-top: 28px;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 193, 0.4);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

/* 要点条目 */
.page-about .about-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-points li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  padding: 12px 14px;
  border-left: 2px solid var(--cyan);
  background: rgba(22, 56, 79, 0.5);
}

.page-about .about-points__k {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-sm);
  color: var(--yellow);
  min-width: 6.5em;
}

.page-about .about-points li span:last-child {
  flex: 1 1 200px;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--about-body);
}

/* 团队分工 */
.page-about .about-team-layout {
  display: grid;
  gap: 32px;
}

.page-about .about-team {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .about-team__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 9px;
  flex-wrap: wrap;
}

.page-about .about-team__name {
  font-size: var(--fs-md);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-sm);
  color: var(--cyan);
}

.page-about .about-team__track {
  height: 6px;
  background: var(--fence);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  transition: width 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.page-about .about-team__fill--a {
  width: 50%;
  background: var(--cyan);
}

.page-about .about-team__fill--b {
  width: 33.3%;
  background: var(--orange);
}

.page-about .about-team__fill--c {
  width: 16.7%;
  background: var(--yellow);
}

.page-about .about-team__item:hover .about-team__fill--a,
.page-about .about-team__item:focus-within .about-team__fill--a {
  width: 52%;
}

.page-about .about-team__desc {
  margin: 10px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--about-dim);
  max-width: 34em;
}

/* 图片容器 */
.page-about .about-media {
  margin: 0;
}

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

.page-about .about-media figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--cyan);
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--about-dim);
}

/* 数据流程 */
.page-about .about-flow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .about-flow__step {
  position: relative;
  padding-left: 20px;
  border-left: 1px solid var(--about-line);
}

.page-about .about-flow__step::after {
  content: "";
  position: absolute;
  left: -4px;
  top: 4px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-flow h3 {
  margin: 8px 0 8px;
  font-size: var(--fs-md);
  letter-spacing: -0.01em;
}

.page-about .about-flow p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--about-dim);
}

/* 色带 */
.page-about .about-band {
  background: var(--well);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  padding: 16px 0;
}

.page-about .about-band__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-band__inner span {
  white-space: nowrap;
}

/* 版本时间线 */
.page-about .about-versions-wrap {
  position: relative;
}

.page-about .about-versions__bg {
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  pointer-events: none;
  display: none;
}

.page-about .about-versions {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-version {
  position: relative;
  padding: 0 0 32px 38px;
}

.page-about .about-version::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 20px;
  bottom: 0;
  width: 1px;
  background: var(--about-line);
}

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

.page-about .about-version:last-child::before {
  display: none;
}

.page-about .about-version::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 5px;
  width: 11px;
  height: 11px;
  background: var(--deep);
  border: 1px solid var(--cyan);
}

.page-about .about-version__year {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-sm);
  letter-spacing: 0.08em;
  color: var(--yellow);
}

.page-about .about-version h3 {
  margin: 0 0 8px;
  font-size: var(--fs-md);
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.page-about .about-version p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: var(--about-dim);
  max-width: 42em;
}

/* 协作节奏 */
.page-about .about-rhythm {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
}

.page-about .about-rhythm li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: baseline;
  padding: 16px;
  background: var(--navy);
}

.page-about .about-rhythm__k {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--cyan);
  min-width: 5em;
}

.page-about .about-rhythm p {
  margin: 0;
  flex: 1 1 220px;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--about-body);
}

/* 平台信息 */
.page-about .about-info-layout {
  display: grid;
  gap: 32px;
}

.page-about .about-info {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
}

.page-about .about-info li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  align-items: baseline;
  padding: 13px 14px;
  background: var(--deep);
  font-size: var(--fs-sm);
}

.page-about .about-info__k {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--about-dim);
  min-width: 5.5em;
}

.page-about .about-info li span:last-child {
  color: var(--about-body);
  font-variant-numeric: tabular-nums;
}

.page-about .about-info a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 193, 0.35);
}

.page-about .about-info a:hover,
.page-about .about-info a:focus-visible {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

/* 响应式 */
@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 780px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
  }

  .page-about .about-flow__step {
    padding: 24px 20px 0 0;
    border-left: 0;
  }

  .page-about .about-flow__step::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan), var(--about-line));
  }

  .page-about .about-flow__step::after {
    left: 0;
    top: -4px;
  }

  .page-about .about-flow__step:last-child {
    padding-right: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 28px 0 60px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.25fr 1fr;
    gap: 52px;
    align-items: end;
  }

  .page-about .about-chapter {
    padding: 78px 0;
  }

  .page-about .about-chapter__head {
    padding-left: 28px;
    margin-bottom: 32px;
  }

  .page-about .about-chapter__mark {
    gap: 16px;
    margin-bottom: 16px;
  }

  .page-about .chapter__num {
    font-size: var(--fs-xl);
  }
}

@media (min-width: 960px) {
  .page-about .about-team-layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-info-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-versions__bg {
    display: block;
  }

  .page-about .about-versions {
    max-width: 64%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__fill,
  .page-about .about-team__item:hover .about-team__fill--a {
    transition: none;
  }

  .page-about .about-team__item:hover .about-team__fill--a {
    width: 50%;
  }
}