.page-about {
  --about-cut: 16px;
  --about-gap: clamp(14px, 3vw, 24px);
  color: var(--paper);
}

.page-about .about-hero {
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(112deg, transparent 0 21px, rgba(30, 91, 69, 0.22) 21px 22px),
    radial-gradient(115% 85% at 88% 0%, rgba(255, 122, 26, 0.16), transparent 62%);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(36px, 6.4vw, 84px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.03em;
  max-width: 17ch;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: rgba(242, 245, 243, 0.86);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-2);
}

.page-about .about-stats__v {
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-stats__k {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mature);
}

/* 章节骨架 */
.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.6vw, 26px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-chapter__num {
  font-size: clamp(32px, 4.2vw, 52px);
  font-weight: 900;
  line-height: 0.88;
  letter-spacing: -0.05em;
  color: var(--orange);
}

.page-about .about-chapter__tick {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mature);
  border-top: 1px solid var(--line);
  padding-top: 6px;
}

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

.page-about .about-chapter__title {
  margin: 0 0 14px;
  font-size: clamp(23px, 3.1vw, 36px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.018em;
}

.page-about .about-chapter__sub {
  margin: clamp(26px, 3.4vw, 38px) 0 12px;
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
  padding-left: 12px;
  border-left: 3px solid var(--amber);
}

.page-about .about-figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

.page-about .about-figure .media {
  overflow: hidden;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

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

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

/* 三段档案层 */
.page-about .layer-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .layer-card {
  padding: 20px 18px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--hist);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .layer-card--mature {
  border-left-color: var(--mature);
}

.page-about .layer-card--now {
  border-left-color: var(--orange);
  background: linear-gradient(160deg, rgba(255, 122, 26, 0.12), rgba(18, 58, 46, 0.98) 58%);
}

.page-about .layer-card__range {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mature);
  border: 1px solid var(--line);
  padding: 3px 8px;
}

.page-about .layer-card--now .layer-card__range {
  color: var(--orange);
  border-color: rgba(255, 122, 26, 0.5);
}

.page-about .layer-card__name {
  margin: 14px 0 8px;
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .layer-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 245, 243, 0.8);
}

.page-about .layer-card__meta {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.page-about .layer-card__meta div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .layer-card__meta dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mature);
}

.page-about .layer-card__meta dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--amber);
}

/* 三块字段 */
.page-about .field-trio {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin: clamp(20px, 3vw, 30px) 0 clamp(20px, 3vw, 28px);
}

.page-about .field-trio__item {
  position: relative;
  padding: 20px 18px 22px;
  background: linear-gradient(180deg, rgba(30, 91, 69, 0.5), rgba(18, 58, 46, 0.95));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .field-trio__num {
  display: block;
  font-size: clamp(40px, 5.4vw, 62px);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--orange);
}

.page-about .field-trio__name {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .field-trio__bar {
  display: block;
  height: 6px;
  margin: 14px 0;
  background: repeating-linear-gradient(90deg, var(--orange) 0 7px, transparent 7px 12px);
}

.page-about .field-trio__item:nth-child(2) .field-trio__bar {
  background: repeating-linear-gradient(90deg, var(--amber) 0 7px, transparent 7px 12px);
}

.page-about .field-trio__item:nth-child(3) .field-trio__bar {
  background: repeating-linear-gradient(90deg, var(--hist) 0 7px, transparent 7px 12px);
}

.page-about .field-trio__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 245, 243, 0.82);
}

/* 抽屉 */
.page-about .about-drawer {
  margin-top: 20px;
}

.page-about .dimensions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .dimension {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
}

.page-about .dimension:nth-child(6) {
  border-left-color: var(--orange);
}

.page-about .dimension .drawer__title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 16px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
}

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

.page-about .dimension .drawer__title::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-about .dimension[open] .drawer__title::after {
  content: "–";
}

.page-about .dimension[open] .drawer__title {
  color: var(--amber);
  border-bottom: 1px solid var(--line);
}

/* 团队环形 */
.page-about .team-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(22px, 3vw, 32px);
  align-items: center;
}

.page-about .team-ring {
  position: relative;
  width: min(230px, 62vw);
  margin-inline: auto;
}

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

.page-about .team-ring__seg {
  transition: stroke-width 0.28s var(--ease), opacity 0.28s var(--ease);
}

.page-about .team-ring svg:hover .team-ring__seg {
  opacity: 0.45;
}

.page-about .team-ring svg .team-ring__seg:hover {
  stroke-width: 19;
  opacity: 1;
}

.page-about .team-ring__center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.page-about .team-ring__total {
  font-size: clamp(30px, 4vw, 40px);
  font-weight: 900;
  line-height: 1;
  color: var(--orange);
}

.page-about .team-ring__unit {
  margin-top: 3px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mature);
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .team-legend__row {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .team-legend__row:hover {
  border-color: var(--amber);
  background: rgba(30, 91, 69, 0.5);
}

.page-about .team-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: block;
}

.page-about .team-legend__dot--a {
  background: var(--orange);
}

.page-about .team-legend__dot--b {
  background: var(--amber);
}

.page-about .team-legend__dot--c {
  background: var(--line);
}

.page-about .team-legend__dot--d {
  background: var(--hist);
}

.page-about .team-legend__name {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(242, 245, 243, 0.85);
}

.page-about .team-legend__num {
  font-size: 20px;
  font-weight: 800;
  color: var(--paper);
}

/* 三级校验轨道 */
.page-about .checkrail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .checkrail__lane {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-about .checkrail__name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .checkrail__lane--b .checkrail__name {
  color: var(--amber);
}

.page-about .checkrail__lane--c .checkrail__name {
  color: var(--hist);
}

.page-about .checkrail__line {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 2px;
  background: var(--line);
}

.page-about .checkrail__line i {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .checkrail__lane--b .checkrail__line i {
  background: var(--amber);
}

.page-about .checkrail__lane--c .checkrail__line i {
  background: var(--diff);
}

.page-about .checkrail__desc {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 245, 243, 0.78);
}

/* 白皮书 */
.page-about .paperstrip {
  display: flex;
  gap: 10px;
  margin: 20px 0 0;
  padding: 2px 2px 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .paperstrip__item {
  flex: 0 0 172px;
  scroll-snap-align: start;
  display: grid;
  gap: 8px;
  padding: 14px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
}

.page-about .paperstrip__no {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mature);
}

.page-about .paperstrip__topic {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 30px);
}

/* 结尾 */
.page-about .about-next__panel {
  padding: clamp(24px, 4vw, 44px);
  background: linear-gradient(135deg, rgba(255, 122, 26, 0.14), rgba(18, 58, 46, 0.96) 55%);
  border: 1px solid var(--line);
  border-left: 4px solid var(--orange);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 800;
  letter-spacing: -0.015em;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 245, 243, 0.85);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .field-trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .layer-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .checkrail__lane {
    grid-template-columns: 128px minmax(0, 1fr) minmax(0, 1.5fr);
    align-items: center;
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    position: sticky;
    top: clamp(84px, 12vh, 128px);
    align-self: start;
  }

  .page-about .team-block {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .team-ring {
    margin-inline: 0;
  }
}

@media (min-width: 1080px) {
  .page-about .about-chapter__body--split {
    display: grid;
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: clamp(26px, 3.4vw, 48px);
    align-items: start;
  }

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