.page-about {
  --ab-panel-a: rgba(11, 39, 64, .78);
  --ab-panel-b: rgba(7, 28, 45, .96);
  --ab-glow: rgba(255, 107, 74, .20);
  overflow-x: clip;
}

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

.page-about .ab-crumbs {
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

/* ============ 首屏 ============ */

.page-about .ab-hero {
  padding-top: clamp(2rem, 5vw, 3.4rem);
  position: relative;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: 12%;
  left: -12%;
  width: 46%;
  max-width: 520px;
  aspect-ratio: 1;
  background: radial-gradient(circle, var(--ab-glow), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2.2rem, 6vw, 4rem);
}

.page-about .ab-hero__lead {
  max-width: 60ch;
}

.page-about .ab-hero__lead h1 {
  margin: clamp(.7rem, 2vw, 1.1rem) 0 clamp(1rem, 2.4vw, 1.5rem);
}

.page-about .ab-facts {
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.2rem;
}

.page-about .ab-facts li {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding-left: 1rem;
  border-left: 2px solid var(--edge);
}

.page-about .ab-facts .metric {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 3.4vw, 1.65rem);
  line-height: 1.1;
  color: var(--coral);
  letter-spacing: .01em;
}

.page-about .ab-facts li > span:last-child {
  font-size: .9rem;
  line-height: 1.65;
  color: var(--pearl-dim);
}

.page-about .ab-hero__door {
  position: relative;
  max-width: 460px;
  width: 100%;
  justify-self: end;
}

.page-about .ab-hero__door .media--portal {
  position: relative;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  border-left: 3px solid var(--edge);
  background: linear-gradient(165deg, var(--sea-600), var(--sea-900));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
}

.page-about .ab-hero__door .media--portal img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-hero__door::after {
  content: "";
  position: absolute;
  inset: -10% -14% auto auto;
  width: 58%;
  aspect-ratio: 1;
  background: radial-gradient(circle, var(--ab-glow), transparent 68%);
  pointer-events: none;
}

.page-about .ab-hero__badge {
  position: absolute;
  left: 0;
  bottom: clamp(1.2rem, 3vw, 2rem);
  max-width: 78%;
  padding: .9rem 1.2rem;
  background: var(--coral);
  color: var(--ink-on-coral);
  clip-path: polygon(0 0, calc(100% - var(--notch)) 0, 100% 100%, 0 100%);
  z-index: 2;
}

.page-about .ab-hero__badge .metric {
  font-family: var(--font-mono);
  font-size: .92rem;
  letter-spacing: .04em;
  margin: 0 0 .2rem;
}

.page-about .ab-hero__badge p:last-child {
  margin: 0;
  font-size: .85rem;
  line-height: 1.5;
}

/* ============ 职能分组 ============ */

.page-about .ab-roles__list {
  list-style: none;
  margin: clamp(2.2rem, 5vw, 3.4rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1rem, 2.6vw, 1.6rem);
}

.page-about .ab-role {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .65rem;
  padding: clamp(1.4rem, 3.6vw, 2rem);
  background: linear-gradient(158deg, var(--ab-panel-a), var(--ab-panel-b) 68%);
  border: 1px solid var(--line);
  border-left: 2px solid var(--edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
  transition: border-left-color .25s ease, background .25s ease, transform .25s ease;
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-within {
  border-left-color: var(--coral);
  background: linear-gradient(158deg, rgba(18, 58, 85, .88), var(--ab-panel-b) 68%);
  transform: translateY(-3px);
}

.page-about .ab-role__no {
  font-family: var(--font-mono);
  font-size: .9rem;
  letter-spacing: .16em;
  color: var(--coral);
}

.page-about .ab-role h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.6vw, 1.45rem);
  letter-spacing: .02em;
  color: var(--pearl);
}

.page-about .ab-role p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--pearl-dim);
}

.page-about .ab-role__meta {
  margin-top: .35rem !important;
  padding-top: .8rem;
  border-top: 1px dashed var(--line-strong);
  font-family: var(--font-mono);
  font-size: .78rem !important;
  letter-spacing: .05em;
  color: var(--pearl-faint) !important;
}

/* ============ 协作方式 ============ */

.page-about .ab-flow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.4rem);
  align-items: center;
}

.page-about .ab-flow__media.media--wide {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(150deg, var(--sea-700), var(--sea-900));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
}

.page-about .ab-flow__media.media--wide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-flow__body h2 {
  margin: .7rem 0 clamp(1.4rem, 3.4vw, 2rem);
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(.9rem, 2.4vw, 1.3rem);
}

.page-about .ab-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(.9rem, 2.4vw, 1.4rem);
  padding-bottom: clamp(.9rem, 2.4vw, 1.3rem);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-steps li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .ab-steps .metric {
  font-family: var(--font-mono);
  font-size: .95rem;
  letter-spacing: .12em;
  color: var(--coral);
  padding-top: .2rem;
}

.page-about .ab-steps h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  letter-spacing: .015em;
  color: var(--pearl);
}

.page-about .ab-steps p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--pearl-dim);
}

/* ============ 常见处境 ============ */

.page-about .ab-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.4rem);
  align-items: start;
  margin-top: clamp(2rem, 4.6vw, 3rem);
}

.page-about .ab-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-scenes li {
  background: var(--sea-800);
  padding: clamp(1.1rem, 3vw, 1.6rem) clamp(1rem, 2.6vw, 1.5rem);
  display: grid;
  gap: .5rem;
  transition: background .25s ease;
}

.page-about .ab-scenes li:hover,
.page-about .ab-scenes li:focus-within {
  background: var(--sea-700);
}

.page-about .ab-scenes .tag {
  justify-self: start;
}

.page-about .ab-scenes h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  letter-spacing: .015em;
  color: var(--pearl);
}

.page-about .ab-scenes p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--pearl-dim);
}

.page-about .ab-reach__media.media--square {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-left: 3px solid var(--edge);
  background: linear-gradient(160deg, var(--sea-600), var(--sea-900));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
}

.page-about .ab-reach__media.media--square img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============ 行动区 ============ */

.page-about .ab-cta__panel {
  display: grid;
  gap: clamp(1rem, 2.6vw, 1.4rem);
  padding: clamp(1.6rem, 4.4vw, 2.8rem);
  background: linear-gradient(150deg, rgba(18, 58, 85, .86), var(--ab-panel-b) 72%);
}

.page-about .ab-cta__panel h2 {
  margin: 0;
}

.page-about .ab-cta__panel .lede {
  margin: 0;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: .4rem;
}

/* ============ 响应式 ============ */

@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .ab-roles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-roles__list > li:nth-child(even) {
    margin-top: clamp(2rem, 5vw, 3.6rem);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .8fr);
    align-items: start;
  }

  .page-about .ab-flow__grid {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
  }

  .page-about .ab-reach__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .ab-cta__panel {
    padding: clamp(2.4rem, 4vw, 3.4rem);
  }
}

@media (max-width: 560px) {
  .page-about .ab-hero__door {
    max-width: 100%;
  }

  .page-about .ab-hero__badge {
    max-width: 88%;
  }
}