.page-about {
  --about-axis-w: 152px;
  --about-gap: clamp(20px, 3.6vw, 56px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--line);
  background-color: var(--mist);
  background-image:
    linear-gradient(180deg, rgba(230, 237, 251, 0) 42%, var(--paper) 100%),
    repeating-linear-gradient(90deg, rgba(211, 219, 234, .45) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(0deg, rgba(211, 219, 234, .45) 0 1px, transparent 1px 24px);
  padding: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-hero__lead {
  max-width: 760px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  color: var(--blueprint);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 640px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--grey);
}

.page-about .about-hero__mark {
  display: none;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(28px, 4vw, 52px);
  letter-spacing: 0.02em;
  color: rgba(30, 86, 200, .16);
  margin: 0;
  align-self: end;
  justify-self: end;
  white-space: nowrap;
}

.page-about .about-hero__mark span {
  padding: 0 .25em;
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--line);
}

.page-about .about-figures__item {
  padding: 16px 0 18px;
  border-bottom: var(--line);
}

.page-about .about-figures__item:nth-child(odd) {
  padding-right: 14px;
  border-right: var(--line);
}

.page-about .about-figures__item:nth-child(even) {
  padding-left: 14px;
}

.page-about .about-figures__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brand);
}

.page-about .about-figures__cap {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--grey);
}

.page-about .about-hero__seasonline {
  display: flex;
  height: 6px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__seasonline span {
  flex: 1 1 0;
}

.page-about .about-hero__seasonline span:nth-child(1) { background: var(--spring); }
.page-about .about-hero__seasonline span:nth-child(2) { background: var(--summer); }
.page-about .about-hero__seasonline span:nth-child(3) { background: var(--autumn); }
.page-about .about-hero__seasonline span:nth-child(4) { background: var(--winter); }

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-top: clamp(20px, 3vw, 36px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-axis {
  padding-bottom: 14px;
  margin-bottom: 8px;
  border-bottom: var(--line);
}

.page-about .about-axis__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .about-axis__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-axis__item {
  flex: 0 0 auto;
}

.page-about .about-axis__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey);
  text-decoration: none;
  border: 1px solid var(--grid);
  background: #fff;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-axis__link:hover {
  color: var(--brand);
  border-color: var(--brand-bright);
}

.page-about .about-axis__link[aria-current="true"] {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
}

.page-about .about-axis__year {
  font-weight: 600;
}

.page-about .about-axis__name {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0;
}

.page-about .about-axis__link--sub {
  font-family: var(--font-body);
  font-size: 12px;
}

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

/* ---------- 图片与图注 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
}

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

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 7;
}

.page-about .about-figure--square img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure--tight {
  margin-bottom: 0;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--brand-bright);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--grey);
}

/* ---------- 阶段档案 ---------- */
.page-about .about-stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: clamp(26px, 3.6vw, 44px) 0;
  border-top: 1px solid var(--grid);
  scroll-margin-top: 88px;
}

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

.page-about .about-stage__year {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7vw, 64px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--brand);
}

.page-about .about-stage__body h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: var(--blueprint);
}

.page-about .about-stage__body p {
  margin: 0 0 1.1em;
  max-width: 720px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 通用章节 ---------- */
.page-about .about-chapter {
  padding: clamp(28px, 3.8vw, 48px) 0;
  border-top: 1px solid var(--grid);
  scroll-margin-top: 88px;
}

.page-about .about-chapter h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  color: var(--blueprint);
}

.page-about .about-chapter p {
  margin: 0 0 1.1em;
  max-width: 720px;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-chapter a {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid var(--brand-bright);
}

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

/* ---------- 折线图 ---------- */
.page-about .about-chart {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: clamp(12px, 2vw, 20px);
  border: var(--line);
  background: #fff;
}

.page-about .about-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-chart figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--grey);
}

/* ---------- 团队 ---------- */
.page-about .about-team-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 32px);
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-team {
  border-top: var(--line);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: var(--line);
  transition: background 180ms var(--ease);
}

.page-about .about-team__row:hover {
  background: var(--mist);
}

.page-about .about-team__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brand);
}

.page-about .about-team__text h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--blueprint);
}

.page-about .about-team__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--grey);
  max-width: 620px;
}

/* ---------- 资质 ---------- */
.page-about .about-compliance {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 32px);
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .about-fold {
  border: var(--line);
  background: #fff;
  margin-bottom: 12px;
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  color: var(--blueprint);
  list-style: none;
}

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

.page-about .about-fold summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  color: var(--brand);
}

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

.page-about .about-fold[open] summary {
  border-bottom: var(--line);
}

.page-about .about-fold__body {
  padding: 4px 16px 8px;
}

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

.page-about .about-reg > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .about-reg > div:last-child {
  border-bottom: none;
}

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

.page-about .about-reg dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-reg-list {
  list-style: none;
  margin: 8px 0 4px;
  padding: 0;
}

.page-about .about-reg-list li {
  position: relative;
  padding: 8px 0 8px 18px;
  border-bottom: 1px solid var(--grid);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-reg-list li:last-child {
  border-bottom: none;
}

.page-about .about-reg-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 6px;
  height: 6px;
  background: var(--brand);
}

/* ---------- 季节节奏 ---------- */
.page-about .about-seasons {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  margin: clamp(16px, 2.4vw, 26px) 0;
}

.page-about .about-season {
  background: #fff;
  padding: 16px 18px 18px;
  border-top: 4px solid var(--grid);
}

.page-about .about-season--spring { border-top-color: var(--spring); }
.page-about .about-season--summer { border-top-color: var(--summer); }
.page-about .about-season--autumn { border-top-color: var(--autumn); }
.page-about .about-season--winter { border-top-color: var(--winter); }

.page-about .about-season__name {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--blueprint);
}

.page-about .about-season p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--grey);
  max-width: none;
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(24px, 3.6vw, 44px) clamp(18px, 3vw, 36px) clamp(26px, 3.8vw, 46px);
  background: var(--blueprint);
  border-top: 6px solid var(--spring);
  color: #fff;
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 32px);
  letter-spacing: -0.01em;
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  color: #fff;
}

.page-about .about-cta__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(255, 255, 255, .16);
  border: 1px solid rgba(255, 255, 255, .16);
}

.page-about .about-cta__item {
  display: block;
  padding: 16px 18px;
  background: var(--blueprint);
  text-decoration: none;
  color: #fff;
  transition: background 180ms var(--ease);
}

.page-about .about-cta__item:hover {
  background: var(--brand);
}

.page-about .about-cta__label {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.01em;
}

.page-about .about-cta__desc {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(255, 255, 255, .74);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-figures__item {
    border-bottom: none;
  }

  .page-about .about-figures__item:nth-child(n) {
    padding: 18px 18px 20px;
    border-right: var(--line);
  }

  .page-about .about-figures__item:first-child {
    padding-left: 0;
  }

  .page-about .about-figures__item:last-child {
    border-right: none;
  }

  .page-about .about-reg > div {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }

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

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

@media (min-width: 760px) {
  .page-about .about-stage {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 44px);
    align-items: start;
  }

  .page-about .about-stage__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

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

  .page-about .about-hero__mark {
    display: block;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-axis {
    position: sticky;
    top: 80px;
    padding-bottom: 0;
    margin-bottom: 0;
    border-bottom: none;
  }

  .page-about .about-axis__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-axis__link {
    border: none;
    border-left: 1px solid var(--grid);
    background: transparent;
    padding: 8px 0 8px 16px;
    position: relative;
  }

  .page-about .about-axis__link::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 13px;
    width: 7px;
    height: 7px;
    background: var(--paper);
    border: 1px solid var(--grid);
    transition: background 180ms var(--ease), border-color 180ms var(--ease);
  }

  .page-about .about-axis__link:hover {
    background: transparent;
    color: var(--brand);
  }

  .page-about .about-axis__link[aria-current="true"] {
    background: transparent;
    color: var(--blueprint);
    border-left: 2px solid var(--brand);
    margin-left: -1px;
  }

  .page-about .about-axis__link[aria-current="true"]::before {
    background: var(--brand);
    border-color: var(--brand);
    left: -5px;
    width: 8px;
    height: 8px;
  }

  .page-about .about-axis__link[aria-current="true"] .about-axis__year {
    color: var(--brand);
  }

  .page-about .about-axis__item--sub .about-axis__link {
    font-size: 12px;
    color: #8892a6;
  }

  .page-about .about-team-wrap {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }

  .page-about .about-figure--wide {
    margin-top: 4px;
  }

  .page-about .about-compliance {
    grid-template-columns: 320px minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1120px) {
  .page-about .about-seasons {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__link,
  .page-about .about-team__row,
  .page-about .about-cta__item {
    transition: none;
  }
}