.page-about {
  background: var(--snow);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  font-size: 13px;
  color: var(--ink-56);
}

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

.page-about .about-crumbs a:hover {
  color: var(--lake-lt);
  text-decoration: underline;
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--ink);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* 首屏：整幅图像 + 雪白斜切标题块 */
.page-about .about-hero {
  position: relative;
  margin: 16px 0 0;
}

.page-about .about-hero img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center 62%;
}

.page-about .about-hero-plate {
  position: relative;
  margin-top: -40px;
  padding: 52px 0 4px;
  background: var(--snow);
  clip-path: polygon(0 38px, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--barley);
}

.page-about .about-kicker::after {
  content: "";
  flex: 0 0 auto;
  width: 32px;
  height: 1px;
  background: var(--stone);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 8vw, 3.4rem);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.page-about .about-lede {
  margin: 0;
  max-width: 30em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-72);
}

/* 细线章节索引 */
.page-about .about-idx {
  margin-top: 28px;
  border-top: 1px solid var(--stone);
  border-bottom: 1px solid var(--stone);
}

.page-about .about-idx-list {
  display: flex;
  gap: 26px;
  margin: 0;
  padding: 14px 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-idx-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-72);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-idx-link .about-num {
  color: var(--barley);
  font-size: 12px;
}

.page-about .about-idx-link:hover,
.page-about .about-idx-link:focus-visible {
  color: var(--lake);
}

/* 正文栅格 */
.page-about .about-section {
  padding: 56px 0;
  scroll-margin-top: 72px;
}

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

.page-about .about-body p {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-72);
}

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

.page-about .about-section h2 {
  margin: 0 0 22px;
  font-size: clamp(1.6rem, 5.4vw, 2.4rem);
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .about-quote {
  margin: 0;
  padding: 6px 0 6px 20px;
  border-left: 3px solid var(--barley);
  font-size: 19px;
  line-height: 1.65;
  color: var(--ink);
}

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

/* 三条准则 */
.page-about .about-creed {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-creed-item {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--stone);
}

.page-about .about-creed-item:last-child {
  border-bottom: 1px solid var(--stone);
}

.page-about .about-creed-item .about-num {
  font-size: 12px;
  color: var(--barley);
  letter-spacing: 0.12em;
}

.page-about .about-creed-title {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
}

.page-about .about-creed-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-72);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 34px;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-56);
}

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

.page-about .about-team-item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 2px 10px;
  padding: 14px 0;
  border-top: 1px solid var(--stone);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-team-item:last-child {
  border-bottom: 1px solid var(--stone);
}

.page-about .about-team-item .about-num {
  grid-row: 1 / span 2;
  font-size: 12px;
  color: var(--barley);
  padding-top: 4px;
  transition: color 0.18s var(--ease);
}

.page-about .about-team-name {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  font-weight: 800;
}

.page-about .about-team-text {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-56);
  transition: color 0.18s var(--ease);
}

.page-about .about-team-item:hover .about-team-text,
.page-about .about-team-item:focus-within .about-team-text {
  color: var(--ink);
}

.page-about .about-team-item:hover .about-num {
  color: var(--rock-dk);
}

/* 深色能力版图 */
.page-about .about-ability {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--snow);
}

.page-about .about-ability-figure {
  position: absolute;
  top: -6%;
  right: -34%;
  width: 118%;
  margin: 0;
  opacity: 0.22;
  pointer-events: none;
}

.page-about .about-ability-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-ability .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-ability .about-kicker {
  color: var(--barley-lt);
}

.page-about .about-ability .about-kicker::after {
  background: rgba(203, 216, 209, 0.34);
}

.page-about .about-ability h2 {
  color: var(--snow);
}

.page-about .about-ability .about-body p {
  color: rgba(247, 250, 248, 0.76);
}

.page-about .about-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 24px;
  margin-top: 32px;
}

.page-about .about-stat {
  padding: 18px 0;
  border-top: 1px solid rgba(203, 216, 209, 0.28);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.7rem, 6vw, 2.4rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--snow);
}

.page-about .about-stat-unit {
  font-size: 0.42em;
  font-weight: 500;
  color: var(--barley-lt);
  letter-spacing: 0.04em;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 250, 248, 0.68);
}

/* 四阶段 */
.page-about .about-intro {
  margin-bottom: 28px;
}

.page-about .about-stages {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
}

.page-about .about-stage {
  padding: 24px 22px 30px;
  color: var(--snow);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), 0 100%);
}

.page-about .about-stage:nth-child(1) {
  background: var(--ink);
}

.page-about .about-stage:nth-child(2) {
  background: var(--barley);
}

.page-about .about-stage:nth-child(3) {
  background: var(--lake);
}

.page-about .about-stage:nth-child(4) {
  background: var(--rock-dk);
}

.page-about .about-stage:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: 4px;
}

.page-about .about-stage-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  opacity: 0.75;
}

.page-about .about-stage-name {
  margin: 10px 0 8px;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.35;
}

.page-about .about-stage-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(247, 250, 248, 0.9);
}

/* 覆盖与协作 */
.page-about .about-reach {
  background: var(--mist);
}

.page-about .about-reach-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-reach-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-reach-item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--stone);
}

.page-about .about-reach-item:last-child {
  border-bottom: 1px solid var(--stone);
}

.page-about .about-reach-key {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 600;
  color: var(--lake);
}

.page-about .about-reach-val {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-72);
}

/* 收尾 */
.page-about .about-join {
  padding: 60px 0 72px;
}

.page-about .about-join-inner {
  display: grid;
  gap: 28px;
  padding-top: 28px;
  border-top: 3px solid var(--barley);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
}

.page-about .about-actions .about-idx-link {
  color: var(--lake);
}

.page-about .about-actions .about-idx-link:hover {
  color: var(--rock-dk);
}

.page-about .about-actions .about-num {
  display: none;
}

@media (min-width: 720px) {
  .page-about .about-section {
    padding: 76px 0;
  }

  .page-about .about-hero-plate {
    padding-top: 48px;
  }

  .page-about .about-quote {
    font-size: 22px;
  }

  .page-about .about-creed-item {
    grid-template-columns: 56px minmax(0, 200px) minmax(0, 1fr);
    align-items: baseline;
    gap: 0 20px;
  }

  .page-about .about-stages {
    display: flex;
    gap: 16px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
  }

  .page-about .about-stage {
    flex: 0 0 58%;
    scroll-snap-align: start;
  }

  .page-about .about-reach-item {
    grid-template-columns: minmax(0, 180px) minmax(0, 1fr);
    align-items: baseline;
    gap: 0 24px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    margin-top: 24px;
  }

  .page-about .about-hero img {
    aspect-ratio: 16 / 9;
  }

  .page-about .about-hero-plate {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 58%;
    margin-top: 0;
    padding: 44px 44px 40px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 64px), 0 100%);
  }

  .page-about .about-lede {
    font-size: 17px;
  }

  .page-about .about-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-quote {
    padding-left: 26px;
    font-size: 24px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-team-section {
    padding-top: 84px;
  }

  .page-about .about-ability-figure {
    right: -8%;
    top: -18%;
    width: 52%;
    opacity: 0.28;
  }

  .page-about .about-stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 40px;
  }

  .page-about .about-stages {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    overflow: visible;
  }

  .page-about .about-stage {
    flex: none;
    padding: 28px 24px 34px;
  }

  .page-about .about-reach-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-join-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 40px;
    padding-top: 36px;
  }

  .page-about .about-actions {
    justify-content: flex-start;
    padding-bottom: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-idx-link,
  .page-about .about-team-item,
  .page-about .about-team-item .about-num,
  .page-about .about-team-text {
    transition: none;
  }
}