.page-about {
  --pab-gap: clamp(1.5rem, 4vw, 3.5rem);
  --pab-section-pad: clamp(3.5rem, 8vw, 7rem) 1.25rem;
  --pab-wall-grid:
    linear-gradient(rgba(217, 201, 163, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(217, 201, 163, 0.14) 1px, transparent 1px);
  --pab-brick-grid:
    repeating-linear-gradient(to right, rgba(217, 201, 163, 0.24) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(to bottom, rgba(217, 201, 163, 0.2) 0 1px, transparent 1px 30px);
  background-color: var(--paper);
  color: var(--ink);
}

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

.page-about figure {
  margin: 0;
}

.page-about figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--slate);
  letter-spacing: 0.08em;
  margin-top: 0.5rem;
}

.page-about .pab-cover__inner,
.page-about .pab-assets__content,
.page-about .pab-tech__list,
.page-about .pab-culture__inner,
.page-about .pab-outro__inner {
  width: min(calc(100% - 2rem), var(--site-width));
  margin-inline: auto;
}

/* ---------- 封面档案区 ---------- */

.page-about .pab-cover {
  background-color: var(--green-deep);
  background-image:
    var(--pab-wall-grid),
    radial-gradient(ellipse at 80% 18%, rgba(255, 90, 31, 0.2), transparent 55%);
  background-size: 26px 26px, cover;
  color: var(--paper);
  padding: var(--pab-section-pad);
  border-bottom: 6px solid var(--orange);
}

.page-about .pab-cover .breadcrumb {
  color: rgba(252, 250, 242, 0.7);
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .pab-cover .breadcrumb a {
  color: var(--sand);
  text-underline-offset: 4px;
}

.page-about .pab-cover__grid {
  display: flex;
  flex-direction: column;
  gap: var(--pab-gap);
}

.page-about .pab-cover__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 1rem;
}

.page-about .pab-cover__title {
  font-size: clamp(2.2rem, 6vw, 4.4rem);
  line-height: 1.08;
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.03em;
  margin: 0 0 1.25rem;
}

.page-about .pab-cover__title span {
  display: block;
  font-size: 0.3em;
  font-style: normal;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: rgba(252, 250, 242, 0.74);
  margin-top: 0.85em;
}

.page-about .pab-cover__lead {
  max-width: 58ch;
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.85;
  color: rgba(252, 250, 242, 0.86);
  margin: 0;
}

.page-about .pab-cover__index {
  border-top: 1px solid rgba(217, 201, 163, 0.35);
  padding-top: 1.5rem;
}

.page-about .pab-cover__index-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: rgba(252, 250, 242, 0.6);
  margin: 0 0 1rem;
}

.page-about .pab-cover__index ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem 1.5rem;
}

.page-about .pab-cover__index li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .pab-cover__index strong {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  color: var(--orange);
  line-height: 1;
}

.page-about .pab-cover__index span {
  font-size: 0.82rem;
  color: rgba(252, 250, 242, 0.66);
  letter-spacing: 0.08em;
}

/* ---------- 章节标题 ---------- */

.page-about .pab-section-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  border-bottom: 2px solid var(--sand);
  padding-bottom: 1.25rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .pab-section-head__index {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  line-height: 1;
  color: var(--green);
  padding-right: 0.2rem;
}

.page-about .pab-section-head__text h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.02em;
}

.page-about .pab-section-head__meta {
  margin: 0.4rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--slate);
  letter-spacing: 0.12em;
}

/* ---------- 01 发展里程碑 ---------- */

.page-about .pab-milestones {
  padding: var(--pab-section-pad);
  position: relative;
}

.page-about .pab-milestones::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.45;
  background-image: var(--pab-wall-grid);
  background-size: 28px 28px;
}

.page-about .pab-milestones .pab-section-head,
.page-about .pab-timeline {
  position: relative;
}

.page-about .pab-milestones__curve {
  display: block;
  width: min(100%, 560px);
  height: auto;
  margin: -0.5rem auto 2.5rem;
}

.page-about .pab-timeline {
  max-width: 1080px;
  margin-inline: auto;
  position: relative;
}

.page-about .pab-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 13px;
  width: 1px;
  background: repeating-linear-gradient(to bottom, var(--sand) 0 5px, transparent 5px 10px);
}

.page-about .pab-timeline__item {
  position: relative;
  padding-left: 3.75rem;
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .pab-timeline__item:last-child {
  margin-bottom: 0;
}

.page-about .pab-timeline__marker {
  position: absolute;
  left: 0;
  top: 2px;
  width: 3.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.page-about .pab-timeline__dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px var(--green-pale), 0 0 0 4px var(--green);
  transition: background-color 180ms ease, transform 180ms ease;
}

.page-about .pab-timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--green-deep);
  background: var(--green-pale);
  padding: 0.2rem 0.3rem;
  border: 1px solid rgba(27, 122, 52, 0.25);
}

.page-about .pab-timeline__card {
  background: var(--paper);
  border: 1px solid rgba(217, 201, 163, 0.75);
  border-left: 4px solid var(--green);
  padding: clamp(1.25rem, 3vw, 1.75rem);
  box-shadow: 0 10px 28px rgba(11, 59, 26, 0.08);
  position: relative;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.page-about .pab-timeline__card:hover {
  transform: translateY(-4px) skewX(-0.6deg);
  box-shadow: var(--shadow);
  border-left-color: var(--orange);
}

.page-about .pab-timeline__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 2rem;
  line-height: 1;
  color: var(--green);
  opacity: 0.85;
  margin-bottom: 0.75rem;
}

.page-about .pab-timeline__card h3 {
  margin: 0.75rem 0 0.5rem;
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .pab-timeline__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .pab-timeline__shot {
  margin-top: 1.25rem;
  border: 1px solid rgba(217, 201, 163, 0.5);
  background: var(--green-pale);
  padding: 0.5rem;
}

.page-about .pab-timeline__shot img {
  width: 100%;
}

/* ---------- 02 数据资产 ---------- */

.page-about .pab-assets {
  background-color: var(--green-pale);
  border-block: 1px solid rgba(27, 122, 52, 0.16);
  padding: var(--pab-section-pad);
}

.page-about .pab-assets__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pab-gap);
  align-items: start;
}

.page-about .pab-assets__chart {
  border: 1px solid rgba(27, 122, 52, 0.18);
  background: var(--paper);
  padding: 1rem;
}

.page-about .pab-assets__chart img {
  width: 100%;
}

.page-about .pab-assets__ledger {
  border-top: 2px solid var(--green);
  margin: 0;
}

.page-about .pab-assets__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  border-bottom: 1px solid rgba(217, 201, 163, 0.7);
  padding: 1rem 0.25rem;
  align-items: baseline;
}

.page-about .pab-assets__row dt {
  font-weight: 600;
  color: var(--ink);
  font-size: 0.95rem;
}

.page-about .pab-assets__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--green);
  white-space: nowrap;
}

.page-about .pab-assets__note {
  margin: clamp(2rem, 5vw, 3rem) auto 0;
  max-width: 78ch;
  padding: 1rem 1.25rem;
  background: var(--orange-pale);
  border-left: 4px solid var(--orange);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 03 技术能力 ---------- */

.page-about .pab-tech {
  background-color: var(--ink);
  color: var(--paper);
  padding: var(--pab-section-pad);
}

.page-about .pab-tech .pab-section-head {
  border-color: rgba(217, 201, 163, 0.3);
}

.page-about .pab-tech .pab-section-head__index {
  color: var(--orange);
}

.page-about .pab-tech .pab-section-head__title {
  color: var(--paper);
}

.page-about .pab-tech .pab-section-head__meta {
  color: rgba(252, 250, 242, 0.55);
}

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

.page-about .pab-tech__item {
  border: 1px solid rgba(252, 250, 242, 0.14);
  background: rgba(252, 250, 242, 0.05);
  padding: 1.5rem;
  transition: background-color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.page-about .pab-tech__item:hover {
  background: rgba(252, 250, 242, 0.09);
  border-color: rgba(255, 90, 31, 0.6);
  transform: translateY(-2px);
}

.page-about .pab-tech__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.1rem;
}

.page-about .pab-tech__icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  background: rgba(255, 90, 31, 0.14);
  color: var(--orange);
}

.page-about .pab-tech__index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: rgba(252, 250, 242, 0.4);
}

.page-about .pab-tech__item h3 {
  margin: 0 0 0.5rem;
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .pab-tech__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(252, 250, 242, 0.72);
}

/* ---------- 04 文化底色 ---------- */

.page-about .pab-culture {
  padding: var(--pab-section-pad);
  background-color: var(--paper);
  background-image: var(--pab-brick-grid);
}

.page-about .pab-culture__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pab-gap);
  align-items: center;
}

.page-about .pab-culture__figure {
  border: 1px solid var(--sand);
  background: var(--paper);
  padding: 0.75rem;
  box-shadow: 0 12px 32px rgba(11, 59, 26, 0.08);
}

.page-about .pab-culture__figure img {
  width: 100%;
}

.page-about .pab-culture__text h3 {
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  font-weight: 800;
  font-style: italic;
  margin: 0 0 1rem;
}

.page-about .pab-culture__text p {
  line-height: 1.85;
  color: var(--slate);
  max-width: 60ch;
  margin: 0 0 1rem;
}

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

/* ---------- 档案尾页 ---------- */

.page-about .pab-outro {
  background-color: var(--green-deep);
  color: var(--paper);
  padding: var(--pab-section-pad);
  border-top: 6px solid var(--orange);
}

.page-about .pab-outro__inner {
  text-align: center;
}

.page-about .pab-outro__title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  font-style: italic;
  margin: 0 0 0.75rem;
}

.page-about .pab-outro__text {
  max-width: 52ch;
  margin: 0 auto 1.75rem;
  color: rgba(252, 250, 242, 0.76);
  line-height: 1.75;
}

.page-about .pab-outro__trust {
  margin: 0 auto 2rem;
  max-width: 66ch;
  padding: 1rem 1.25rem;
  border: 1px solid rgba(217, 201, 163, 0.35);
  border-left: 4px solid var(--orange);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.8;
  color: rgba(252, 250, 242, 0.85);
  text-align: left;
}

.page-about .pab-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.page-about .pab-outro__links .btn--ghost {
  border-color: rgba(252, 250, 242, 0.45);
  color: var(--paper);
}

.page-about .pab-outro__links .btn--ghost:hover,
.page-about .pab-outro__links .btn--ghost:focus-visible {
  border-color: var(--paper);
  background: rgba(252, 250, 242, 0.12);
  color: var(--paper);
}

.page-about .pab-outro__links .btn:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

/* ---------- 平板与桌面 ---------- */

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

  .page-about .pab-tech__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about .pab-assets__content {
    grid-template-columns: 1.1fr 1fr;
    gap: clamp(1.5rem, 4vw, 3rem);
  }

  .page-about .pab-culture__inner {
    grid-template-columns: 1fr 1.1fr;
    gap: clamp(1.5rem, 4vw, 3rem);
  }
}

@media (min-width: 960px) {
  .page-about .pab-cover__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--pab-gap);
    align-items: end;
  }

  .page-about .pab-cover__index {
    border-top: 0;
    border-left: 1px solid rgba(217, 201, 163, 0.35);
    margin: 0;
    padding: 0 0 0 2rem;
  }

  .page-about .pab-cover__index ul {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .page-about .pab-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .pab-timeline__item {
    display: grid;
    grid-template-columns: 1fr 88px 1fr;
    gap: 0 1.5rem;
    align-items: center;
    padding-left: 0;
  }

  .page-about .pab-timeline__marker {
    grid-column: 2;
    position: static;
    width: auto;
    flex-direction: column;
    align-items: center;
  }

  .page-about .pab-timeline__year {
    writing-mode: horizontal-tb;
    font-size: 0.78rem;
  }

  .page-about .pab-timeline__card {
    grid-column: 1;
  }

  .page-about .pab-timeline__item:nth-child(even) .pab-timeline__card {
    grid-column: 3;
  }

  .page-about .pab-timeline__item:nth-child(even) .pab-timeline__marker {
    order: 1;
  }

  .page-about .pab-timeline__item:nth-child(even) .pab-timeline__card {
    order: 2;
  }

  .page-about .pab-timeline__item .pab-timeline__card {
    order: 0;
  }

  .page-about .pab-timeline__item:nth-child(odd) .pab-timeline__card {
    text-align: left;
  }

  .page-about .pab-tech__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
  }

  .page-about .pab-tech__item {
    padding: 1.75rem;
  }

  .page-about .pab-outro__links {
    gap: 1rem;
  }
}