.page-about {
  --ab-rail: 260px;
  --ab-index: 128px;
  --ab-dash: rgba(107, 122, 144, .42);
  background: var(--paper);
  color: var(--ink);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--space);
  color: var(--white);
  padding-top: calc(var(--masthead-h) + clamp(22px, 5vw, 68px));
  border-bottom: 4px solid var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(127, 211, 242, .13) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(127, 211, 242, .08) 1px, transparent 1px);
  background-size: 84px 84px;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__item {
  color: var(--silver);
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--mint);
}

.page-about .about-hero .u-eyebrow {
  color: var(--ice);
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(18px, 3vw, 34px);
  padding: clamp(22px, 3.4vw, 52px);
  border: var(--bw) solid rgba(214, 222, 232, .35);
  background: linear-gradient(152deg, rgba(18, 58, 107, .74), rgba(11, 27, 58, .3) 62%);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 58px;
  height: 6px;
}

.page-about .about-hero__frame::before {
  top: calc(-1 * var(--bw));
  left: calc(-1 * var(--bw));
  background: var(--mint);
}

.page-about .about-hero__frame::after {
  right: calc(-1 * var(--bw));
  bottom: calc(-1 * var(--bw));
  background: var(--orange);
}

.page-about .about-hero__title {
  margin: 16px 0 20px;
  max-width: 20ch;
  font-family: var(--font-title);
  font-size: clamp(32px, 6.2vw, 92px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.02em;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--bw);
  margin-top: clamp(26px, 4vw, 46px);
  border: var(--bw) solid rgba(214, 222, 232, .28);
  background: rgba(214, 222, 232, .28);
}

.page-about .about-hero__stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 6px;
  padding: clamp(14px, 2vw, 22px);
  background: var(--space);
}

.page-about .about-hero__stat .data-figure__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
}

.page-about .about-hero__stat.data-figure--ice .data-figure__value { color: var(--ice); }
.page-about .about-hero__stat.data-figure--mint .data-figure__value { color: var(--mint); }
.page-about .about-hero__stat.data-figure--orange .data-figure__value { color: var(--orange); }

.page-about .about-hero__stat .data-figure__unit {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--silver);
}

.page-about .about-hero__stat .data-figure__label {
  display: block;
  width: 100%;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(214, 222, 232, .78);
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(28px, 4vw, 52px) var(--gutter) 18px;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 800;
  object-fit: cover;
  border: var(--bw) solid var(--ink);
  box-shadow: 10px 10px 0 rgba(127, 211, 242, .4);
}

.page-about .about-hero__caption {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(214, 222, 232, .68);
}

/* ============ 章节骨架（编辑部双栏） ============ */
.page-about .about-chapter {
  border-bottom: var(--bw) solid var(--silver);
  scroll-margin-top: calc(var(--masthead-h) + 20px);
}

.page-about .about-chapter__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 32px);
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(44px, 6vw, 88px) var(--gutter);
}

.page-about .about-chapter__index {
  font-family: var(--font-mono);
  font-size: clamp(54px, 8vw, 116px);
  font-weight: 700;
  line-height: .82;
  letter-spacing: -.05em;
  color: transparent;
  -webkit-text-stroke: 2px var(--penguin);
}

.page-about .about-chapter__title {
  margin-bottom: 18px;
  font-family: var(--font-title);
  font-size: clamp(24px, 3.2vw, 44px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.01em;
}

.page-about .about-chapter__main p {
  max-width: 62ch;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.85;
}

.page-about .about-chapter__main p + p {
  margin-top: 14px;
}

.page-about .about-chapter__lead {
  color: var(--steel);
}

.page-about .about-chapter__note {
  padding: 6px 0 6px 18px;
  border-left: var(--bw) solid var(--ice);
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-chapter__note .u-eyebrow {
  margin-bottom: 8px;
  color: var(--penguin);
}

/* 深色章节 */
.page-about .about-chapter--dark {
  background: var(--space);
  color: var(--silver);
  border-bottom-color: var(--ink);
}

.page-about .about-chapter--dark .about-chapter__index {
  -webkit-text-stroke-color: var(--ice);
}

.page-about .about-chapter--dark .about-chapter__title {
  color: var(--white);
}

.page-about .about-chapter--dark .about-chapter__note {
  border-left-color: var(--orange);
  color: rgba(214, 222, 232, .76);
}

.page-about .about-chapter--dark .about-chapter__note .u-eyebrow {
  color: var(--orange);
}

.page-about .about-chapter--dark .about-chapter__lead {
  color: rgba(214, 222, 232, .82);
}

/* ============ 02 工作流程 ============ */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--bw);
  margin-top: clamp(22px, 3vw, 34px);
  padding: 0;
  list-style: none;
  border: var(--bw) solid rgba(127, 211, 242, .3);
  background: rgba(127, 211, 242, .3);
}

.page-about .about-steps__item {
  padding: clamp(16px, 2vw, 26px);
  background: var(--space);
  border-left: 4px solid var(--mint);
}

.page-about .about-steps__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ice);
}

.page-about .about-steps__title {
  margin: 10px 0 8px;
  font-size: clamp(16px, 1.2vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-steps__item p {
  font-size: 14px;
  line-height: 1.78;
  color: rgba(214, 222, 232, .8);
}

.page-about .about-workflow__media {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-workflow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 700;
  object-fit: cover;
  border: var(--bw) solid var(--ice);
}

.page-about .about-workflow__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(214, 222, 232, .68);
}

/* ============ 03 团队角色折叠 ============ */
.page-about .about-roles {
  display: grid;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-role {
  border: var(--bw) solid var(--ink);
  background: var(--white);
  box-shadow: var(--shadow-soft);
}

.page-about .about-role__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
}

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

.page-about .about-role__summary:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 3px;
}

.page-about .about-role__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--penguin);
}

.page-about .about-role__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--steel);
}

.page-about .about-role[open] .about-role__summary::after {
  content: "−";
  color: var(--orange);
}

.page-about .about-role__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--silver);
}

.page-about .about-role__body p {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ============ 04 里程碑时间线 ============ */
.page-about .about-track {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0 0 0 28px;
  list-style: none;
  border-left: var(--bw) solid var(--silver);
}

.page-about .about-track__item {
  position: relative;
  padding: 12px 0;
  cursor: default;
}

.page-about .about-track__item + .about-track__item {
  border-top: 1px dashed var(--ab-dash);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 18px;
  width: 12px;
  height: 12px;
  background: var(--paper);
  border: var(--bw) solid var(--penguin);
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus::before {
  background: var(--mint);
  border-color: var(--ink);
}

.page-about .about-track__item:hover,
.page-about .about-track__item:focus {
  background: rgba(127, 211, 242, .12);
  outline: none;
}

.page-about .about-track__item:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 2px;
}

.page-about .about-track__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--penguin);
}

.page-about .about-track__label {
  display: block;
  margin-top: 4px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-track__note {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel);
  transition: max-height .32s var(--ease), opacity .24s var(--ease), margin-top .32s var(--ease);
}

.page-about .about-track__item:hover .about-track__note,
.page-about .about-track__item:focus .about-track__note,
.page-about .about-track__item:focus-within .about-track__note {
  max-height: 200px;
  margin-top: 8px;
  opacity: 1;
}

/* ============ 05 原则与合作 ============ */
.page-about .about-principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-principle {
  padding: clamp(18px, 2.2vw, 26px);
  border: var(--bw) solid var(--ink);
  background: var(--white);
  box-shadow: var(--shadow-soft);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-principle:hover,
.page-about .about-principle:focus-within {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--penguin);
}

.page-about .about-principle h3 {
  margin-bottom: 10px;
  font-size: 17px;
  font-weight: 900;
  line-height: 1.4;
}

.page-about .about-principle h3::before {
  content: "";
  display: block;
  width: 34px;
  height: 4px;
  margin-bottom: 12px;
  background: var(--ice);
}

.page-about .about-principle p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-links {
  margin-top: clamp(22px, 3vw, 32px);
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  border-top: var(--bw) solid var(--ink);
}

.page-about .about-links li {
  border-bottom: 1px solid var(--silver);
}

.page-about .about-links a {
  display: block;
  padding: 14px 4px 14px 26px;
  position: relative;
  font-size: 15px;
  font-weight: 700;
  color: var(--penguin);
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .about-links a::before {
  content: "→";
  position: absolute;
  left: 2px;
  color: var(--ice);
  transition: color .2s var(--ease);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  padding-left: 32px;
  color: var(--ink);
}

.page-about .about-links a:hover::before,
.page-about .about-links a:focus-visible::before {
  color: var(--orange);
}

/* ============ 06 属地与备案 ============ */
.page-about .about-geo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 32px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-geo__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 18px;
  margin: 0;
  padding: 12px 0;
  border-bottom: 1px dashed var(--ab-dash);
}

.page-about .about-geo__key {
  font-size: 14px;
  color: var(--steel);
}

.page-about .about-geo__val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

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

.page-about .about-geo__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 900 / 600;
  object-fit: cover;
  border: var(--bw) solid var(--ink);
  box-shadow: 8px 8px 0 var(--silver);
}

/* ============ 结尾行动区 ============ */
.page-about .about-cta {
  background: var(--penguin);
  color: var(--white);
  border-top: 4px solid var(--ink);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) var(--gutter);
}

.page-about .about-cta h2 {
  font-family: var(--font-title);
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.01em;
}

.page-about .about-cta p {
  margin-top: 14px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: center;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-geo {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about .about-chapter__inner {
    grid-template-columns: var(--ab-index) minmax(0, 1fr) var(--ab-rail);
    gap: clamp(24px, 3.4vw, 56px);
    align-items: start;
  }

  .page-about .about-chapter__note {
    padding-top: 10px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle,
  .page-about .about-track__note,
  .page-about .about-track__item::before,
  .page-about .about-links a,
  .page-about .about-links a::before {
    transition: none;
  }
}