.page-about {
  --ab-glow: 0 0 32px rgba(242, 169, 59, 0.22);
  --ab-glow-cyan: 0 0 26px rgba(40, 224, 208, 0.18);
}

.page-about .ab-crumbs {
  padding-top: 1.6rem;
}

.page-about .ab-p {
  margin: 0 0 0.9rem;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.85;
}

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

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2.2rem, 6vw, 4.5rem) 0 clamp(2rem, 5vw, 3.6rem);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 104px);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 82%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 82%);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -10%;
  height: 60%;
  background: radial-gradient(60% 70% at 18% 30%, rgba(242, 169, 59, 0.13), transparent 70%);
  pointer-events: none;
}

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

.page-about .ab-hero__stamp {
  position: absolute;
  top: 0;
  right: 0;
  font-size: clamp(0.68rem, 1.4vw, 0.82rem);
  letter-spacing: 0.28em;
  color: var(--mist);
  opacity: 0.75;
  padding-top: 0.2rem;
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-hero__title {
  margin: 1.1rem 0 1.4rem;
  font-size: clamp(2.3rem, 8.6vw, 5.2rem);
  line-height: 0.99;
  letter-spacing: -0.035em;
  font-weight: 800;
  max-width: 16ch;
}

.page-about .ab-hero__hl {
  position: relative;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .ab-hero__hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 0.12em;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--amber), var(--cyan));
  opacity: 0.55;
}

.page-about .ab-hero__lede {
  max-width: 46ch;
  color: var(--text);
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  line-height: 1.85;
}

.page-about .ab-hero__meta {
  list-style: none;
  margin: 2.2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1.1rem 1.4rem;
}

.page-about .ab-hero__meta li {
  border-top: 1px solid var(--line-strong);
  padding-top: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
}

.page-about .ab-hero__num {
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  color: var(--amber-soft);
  letter-spacing: -0.02em;
}

.page-about .ab-hero__k {
  font-size: 0.82rem;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 起点 ---------- */
.page-about .ab-origin {
  padding-top: clamp(2rem, 5vw, 3.4rem);
}

.page-about .ab-origin__grid {
  display: grid;
  gap: 1.8rem;
}

.page-about .ab-origin__lead .h2 {
  margin: 0.7rem 0 1.1rem;
}

.page-about .ab-origin__card {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--r-lg);
  padding: clamp(1.4rem, 3.5vw, 2.1rem);
  transform: rotate(-0.6deg);
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.45);
}

.page-about .ab-origin__card-k {
  margin: 0 0 0.9rem;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(10, 12, 16, 0.55);
}

.page-about .ab-origin__card-q {
  margin: 0 0 1.2rem;
  font-size: clamp(1.1rem, 2.8vw, 1.36rem);
  line-height: 1.55;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-origin__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .ab-origin__list li {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  font-size: 0.94rem;
  line-height: 1.6;
  color: rgba(10, 12, 16, 0.82);
  border-top: 1px dashed rgba(10, 12, 16, 0.16);
  padding-top: 0.55rem;
}

.page-about .ab-origin__list .mono {
  color: #b5751a;
  font-size: 0.78rem;
}

/* ---------- 章节头 ---------- */
.page-about .ab-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .ab-sec-head .h2 {
  margin: 0.7rem 0 0.85rem;
}

.page-about .ab-sec-head .lede {
  color: var(--mist);
  line-height: 1.85;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline__fig {
  margin: 0 0 clamp(1.6rem, 4vw, 2.6rem);
  border-radius: var(--r-lg);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--line);
}

.page-about .ab-timeline__fig::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(0deg, rgba(10, 12, 16, 0.28) 0 1px, transparent 1px 4px);
  mix-blend-mode: multiply;
  pointer-events: none;
}

.page-about .ab-timeline__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1400 / 800;
}

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

.page-about .ab-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
  padding: 0 0 2.1rem 1.9rem;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 169, 59, 0.13), var(--ab-glow);
}

.page-about .ab-tl__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1.85rem;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), rgba(40, 224, 208, 0.28), transparent);
}

.page-about .ab-tl__item:last-child::after {
  display: none;
}

.page-about .ab-tl__year {
  font-size: clamp(1.7rem, 6vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  opacity: 0.9;
}

.page-about .ab-tl__body .h3 {
  margin: 0.2rem 0 0.5rem;
}

.page-about .ab-tl__more {
  margin-top: 0.75rem;
  border-top: 1px dashed var(--line-strong);
  padding-top: 0.7rem;
}

.page-about .ab-tl__more summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--amber-soft);
  padding: 0.15rem 0;
  border-radius: var(--r-sm);
}

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

.page-about .ab-tl__more summary::before {
  content: "+";
  display: inline-block;
  width: 1.1rem;
  height: 1.1rem;
  line-height: 1.05rem;
  text-align: center;
  border: 1px solid rgba(242, 169, 59, 0.45);
  border-radius: 50%;
  font-size: 0.8rem;
}

.page-about .ab-tl__more[open] summary::before {
  content: "−";
}

.page-about .ab-tl__more summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .ab-tl__more .ab-p {
  margin-top: 0.75rem;
  padding-left: 1.6rem;
  border-left: 1px solid var(--line);
  color: var(--mist);
  font-size: 0.95rem;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__filter {
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .ab-team__layout {
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-team__fig {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .ab-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1200 / 800;
}

.page-about .ab-team__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .ab-team__card {
  padding: 1.35rem 1.3rem;
  border-radius: var(--r-md);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-team__card.is-out {
  opacity: 0.28;
  transform: translateY(4px);
}

.page-about .ab-team__n {
  margin: 0 0 0.5rem;
  font-size: clamp(1.8rem, 5vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .ab-team__card .h3 {
  margin: 0 0 0.5rem;
}

.page-about .ab-team__card .ab-p {
  font-size: 0.93rem;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 质量 ---------- */
.page-about .ab-quality__path {
  display: grid;
  gap: 1.1rem;
  margin-bottom: 1.6rem;
}

.page-about .ab-quality__path .path__step {
  padding: 1.25rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, var(--ink-3), var(--ink-2));
  position: relative;
}

.page-about .ab-quality__path .path__dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid rgba(40, 224, 208, 0.5);
  color: var(--cyan);
  font-size: 0.86rem;
  margin-bottom: 0.7rem;
  box-shadow: var(--ab-glow-cyan);
}

.page-about .ab-quality__path .h3 {
  margin: 0 0 0.45rem;
}

.page-about .ab-quality__path .ab-p {
  font-size: 0.93rem;
  color: var(--mist);
  line-height: 1.75;
}

.page-about .ab-quality__notes {
  display: grid;
  gap: 1rem;
}

.page-about .ab-quality__note {
  border-left: 2px solid var(--amber);
  padding: 0.35rem 0 0.35rem 1rem;
}

.page-about .ab-note-k {
  margin: 0 0 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber-soft);
}

.page-about .ab-quality__note .ab-p {
  font-size: 0.95rem;
  color: var(--mist);
  line-height: 1.8;
}

/* ---------- 生态 ---------- */
.page-about .ab-eco__layout {
  display: grid;
  gap: 1.6rem;
}

.page-about .ab-eco__fig {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .ab-eco__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1200 / 900;
}

.page-about .ab-eco__stats {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-about .ab-eco__stats li {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.7rem;
}

.page-about .ab-eco__num {
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1;
  color: var(--amber-soft);
  letter-spacing: -0.02em;
  min-width: 2.6ch;
}

.page-about .ab-eco__k {
  font-size: 0.9rem;
  color: var(--mist);
  line-height: 1.6;
}

.page-about .ab-eco__scenes {
  margin-top: 1.8rem;
  padding: clamp(1.3rem, 3.5vw, 1.9rem);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(40, 224, 208, 0.09), rgba(17, 21, 28, 0.9) 55%);
  border: 1px solid var(--line);
}

.page-about .ab-eco__tags {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .ab-eco__tags .tag {
  font-size: 0.82rem;
  padding: 0.34rem 0.72rem;
  border-radius: 999px;
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  padding-bottom: clamp(2.4rem, 6vw, 4rem);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 1.4rem;
  padding: clamp(1.5rem, 4vw, 2.4rem);
  border-radius: var(--r-lg);
  border: 1px solid rgba(242, 169, 59, 0.28);
  background: radial-gradient(120% 140% at 0% 0%, rgba(242, 169, 59, 0.13), transparent 60%), var(--ink-2);
}

.page-about .ab-cta__inner .h2 {
  margin: 0.6rem 0 0.8rem;
}

.page-about .ab-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
}

/* ---------- 桌面 ---------- */
@media (min-width: 760px) {
  .page-about .ab-tl__item {
    grid-template-columns: 9.5rem minmax(0, 1fr);
    gap: 0 2.4rem;
    padding-left: 0;
    padding-bottom: 2.8rem;
  }

  .page-about .ab-tl__item::before {
    left: 10.15rem;
    top: 0.55rem;
  }

  .page-about .ab-tl__item::after {
    left: 10.65rem;
    top: 2.1rem;
  }

  .page-about .ab-tl__body {
    padding-left: 0.2rem;
  }

  .page-about .ab-tl__year {
    font-size: clamp(2rem, 3.6vw, 2.9rem);
    padding-top: 0.15rem;
  }

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

  .page-about .ab-quality__path {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-about .ab-quality__notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem 1.6rem;
  }
}

@media (min-width: 900px) {
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    gap: 2.6rem;
    align-items: start;
  }

  .page-about .ab-origin__card {
    margin-top: 1.6rem;
  }

  .page-about .ab-team__layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 1.8rem;
    align-items: start;
  }

  .page-about .ab-team__fig {
    position: sticky;
    top: 2rem;
  }

  .page-about .ab-eco__layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 2.2rem;
    align-items: start;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 2rem;
  }

  .page-about .ab-cta__acts {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__lede {
    max-width: 52ch;
  }

  .page-about .ab-team__cards {
    gap: 1.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__card {
    transition: none;
  }
}