.page-about {
  --about-axis: 6.5rem;
  --about-gutter: 2rem;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(1.75rem, 4vw, 3.25rem) 0 clamp(2.5rem, 6vw, 5rem);
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-hero__main {
  max-width: 46rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 0.75rem 0 1.1rem;
  max-width: 18ch;
}

.page-about .about-hero .lead {
  color: var(--old);
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.85;
  margin: 0;
  max-width: 58ch;
}

.page-about .about-hero__facts {
  margin: 0;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--grid-line);
}

.page-about .afact {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.25rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .afact dt {
  color: var(--old);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin: 0;
}

.page-about .afact dd {
  margin: 0;
  color: var(--white);
  font-size: 1rem;
  white-space: nowrap;
}

.page-about .afact dd .num {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 4.5rem;
    align-items: start;
  }
}

/* ---------- 分区标题带 ---------- */

.page-about .about-head {
  max-width: 68ch;
}

.page-about .about-head h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 0.6rem 0 0.9rem;
}

.page-about .about-head__note {
  margin: 0;
  color: var(--old);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 52ch;
}

@media (min-width: 860px) {
  .page-about .about-head {
    max-width: none;
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 0 4rem;
    align-items: end;
  }

  .page-about .about-head .eyebrow {
    grid-column: 1 / -1;
    margin-bottom: 0.55rem;
  }

  .page-about .about-head h2 {
    margin-bottom: 0;
  }

  .page-about .about-head__note {
    padding-bottom: 0.3rem;
  }
}

/* ---------- 纵向时间轴 ---------- */

.page-about .about-line {
  position: relative;
  list-style: none;
  margin: clamp(2.5rem, 5vw, 3.75rem) 0 0;
  padding: 0;
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: var(--about-axis);
  top: 0.8rem;
  bottom: 2.5rem;
  width: 1px;
  background: var(--grid-line);
}

.page-about .about-line__item {
  display: grid;
  grid-template-columns: var(--about-axis) minmax(0, 1fr);
  padding-bottom: clamp(2rem, 3.5vw, 3rem);
}

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

.page-about .about-line__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  line-height: 1.9;
  color: var(--cyan);
  text-align: right;
  padding-right: 1.6rem;
}

.page-about .about-line__body {
  position: relative;
  padding-left: var(--about-gutter);
}

.page-about .about-line__body::before {
  content: "";
  position: absolute;
  left: -3.5px;
  top: 0.62rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-08);
}

.page-about .about-line__body h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.2rem;
  line-height: 1.35;
  letter-spacing: -0.005em;
  color: var(--white);
  margin: 0 0 0.55rem;
}

.page-about .about-line__body p {
  margin: 0;
  color: var(--old);
  font-size: 0.95rem;
  line-height: 1.85;
  max-width: 60ch;
}

/* ---------- 图片容器 ---------- */

.page-about .about-frame {
  border: 1px solid var(--grid-line);
  background: var(--graphite);
  overflow: hidden;
}

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

.page-about .about-frame--tall img {
  aspect-ratio: 3 / 2;
}

.page-about .media-caption {
  margin-top: 0.75rem;
  color: var(--old);
  font-size: 0.8rem;
  line-height: 1.65;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 团队 ---------- */

.page-about .about-team__intro {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-team__text h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  line-height: 1.14;
  color: var(--white);
  margin: 0.6rem 0 0.9rem;
}

.page-about .about-team__text p {
  margin: 0;
  color: var(--old);
  font-size: 0.95rem;
  line-height: 1.85;
  max-width: 52ch;
}

@media (min-width: 900px) {
  .page-about .about-team__intro {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3.5rem;
    align-items: center;
  }
}

.page-about .team-scale {
  display: flex;
  flex-direction: column;
  gap: 4px;
  list-style: none;
  margin: clamp(2.5rem, 5vw, 3.5rem) 0 0;
  padding: 0;
}

.page-about .team-scale__seg {
  flex-basis: 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1rem 1.1rem 1.15rem;
  background: var(--graphite);
  border-top: 2px solid var(--grid-line);
  transition: transform 160ms ease, border-color 160ms ease;
}

.page-about .team-scale__seg--product {
  flex-grow: 14;
  border-top-color: var(--cyan);
}

.page-about .team-scale__seg--content {
  flex-grow: 11;
  border-top-color: var(--cyan-mist);
}

.page-about .team-scale__seg--tech {
  flex-grow: 22;
  border-top-color: var(--amber);
}

.page-about .team-scale__seg--service {
  flex-grow: 11;
  border-top-color: var(--old);
}

.page-about .team-scale__seg:hover,
.page-about .team-scale__seg:focus-within {
  transform: translateY(-2px);
  border-top-color: var(--cyan);
}

.page-about .team-scale__name {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--white);
}

.page-about .team-scale__count {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-scale__seg--tech .team-scale__count {
  color: var(--amber);
}

@media (min-width: 720px) {
  .page-about .team-scale {
    flex-direction: row;
  }
}

.page-about .team-roles {
  display: grid;
  gap: 1.75rem;
  margin-top: clamp(2rem, 4vw, 3rem);
}

.page-about .team-role h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--white);
  margin: 0 0 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.page-about .team-role__num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--sea);
  background: var(--cyan);
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-tag);
  letter-spacing: 0.02em;
}

.page-about .team-role p {
  margin: 0;
  color: var(--old);
  font-size: 0.92rem;
  line-height: 1.8;
  max-width: 44ch;
  padding-left: 0.9rem;
  border-left: 1px solid var(--grid-line);
}

@media (min-width: 800px) {
  .page-about .team-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2.25rem 4rem;
  }

  .page-about .team-role:nth-child(2),
  .page-about .team-role:nth-child(4) {
    margin-top: 2.75rem;
  }
}

/* ---------- 内容节奏 ---------- */

.page-about .about-rhythm {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.page-about .about-rhythm__text h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  line-height: 1.14;
  color: var(--white);
  margin: 0.6rem 0 0.9rem;
}

.page-about .about-rhythm__text > p {
  margin: 0 0 1.5rem;
  color: var(--old);
  font-size: 0.95rem;
  line-height: 1.85;
  max-width: 54ch;
}

.page-about .rhythm-metrics {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-about .rhythm-metric {
  background: var(--indigo);
  padding: 1rem 1.1rem 1.15rem;
}

.page-about .rhythm-metric dt {
  color: var(--old);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  margin: 0 0 0.45rem;
}

.page-about .rhythm-metric dd {
  margin: 0;
  color: var(--white);
  font-size: 0.92rem;
  line-height: 1.5;
}

.page-about .rhythm-metric dd .num {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--cyan);
  margin-right: 0.15rem;
}

.page-about .about-rhythm__link {
  margin: 1.5rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--old);
}

.page-about .about-rhythm__figure {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 4rem;
  }
}

/* ---------- 覆盖与响应 ---------- */

.page-about .about-stats {
  list-style: none;
  margin: clamp(2rem, 4.5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-about .stat {
  background: var(--sea);
  padding: 1.5rem 1.35rem 1.6rem;
  margin: 0;
}

.page-about .stat__value {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.2;
  color: var(--white);
  letter-spacing: 0.01em;
  margin-bottom: 0.6rem;
}

.page-about .stat__value .num {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 2.1rem;
  line-height: 1;
  color: var(--cyan);
  margin-right: 0.2rem;
}

.page-about .stat__desc {
  margin: 0;
  color: var(--old);
  font-size: 0.88rem;
  line-height: 1.8;
  max-width: 42ch;
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .stat--wide {
    grid-column: span 2;
    background: var(--indigo);
  }
}

.page-about .about-stats__foot {
  margin: 1.75rem 0 0;
  color: var(--old);
  font-size: 0.9rem;
  line-height: 1.85;
  max-width: 68ch;
}

/* ---------- 合作与认可 ---------- */

.page-about .partner-tags {
  list-style: none;
  margin: clamp(2rem, 4vw, 2.75rem) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .partner-tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--white);
  padding: 0.55rem 1rem;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-tag);
  background: var(--sea);
  transition: border-color 160ms ease, color 160ms ease;
}

.page-about .partner-tag:hover {
  border-color: var(--cyan-mist);
  color: var(--cyan-mist);
}

.page-about .partner-tag--count {
  border-style: dashed;
  border-color: var(--old-35);
  color: var(--old);
}

.page-about .partner-tag--count .num {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--cyan);
  margin: 0 0.15rem;
}

.page-about .about-honor {
  margin-top: clamp(2rem, 4vw, 3rem);
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 760px) {
  .page-about .about-honor {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 3rem;
  }
}

.page-about .honor-item {
  padding-left: 1.1rem;
  border-left: 2px solid var(--cyan-18);
}

.page-about .honor-item__label {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .honor-item__text {
  margin: 0;
  color: var(--old);
  font-size: 0.92rem;
  line-height: 1.85;
  max-width: 46ch;
}

/* ---------- 返回 ---------- */

.page-about .about-return {
  padding: clamp(2.25rem, 5vw, 3.5rem) 0 clamp(3rem, 6vw, 4.5rem);
  border-top: 1px solid var(--grid-line);
}

.page-about .about-return__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
}

.page-about .about-return__text {
  margin: 0;
  color: var(--white);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
  line-height: 1.5;
  max-width: 34ch;
}

.page-about .about-return__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (min-width: 760px) {
  .page-about .about-return__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* ---------- 窄屏 ---------- */

@media (max-width: 680px) {
  .page-about .about-line {
    padding-left: 1.5rem;
  }

  .page-about .about-line::before {
    left: 0;
    top: 0.6rem;
    bottom: 1.5rem;
  }

  .page-about .about-line__item {
    grid-template-columns: minmax(0, 1fr);
    padding-bottom: 2.25rem;
  }

  .page-about .about-line__year {
    text-align: left;
    padding-right: 0;
    line-height: 1.6;
    margin-bottom: 0.3rem;
  }

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

  .page-about .about-line__body::before {
    left: -1.5rem;
    transform: translateX(-50%);
    top: 0.6rem;
  }

  .page-about .about-line__body p {
    font-size: 0.92rem;
  }

  .page-about .rhythm-metrics {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-scale__seg,
  .page-about .partner-tag {
    transition: none;
  }

  .page-about .team-scale__seg:hover,
  .page-about .team-scale__seg:focus-within {
    transform: none;
  }
}