.page-about {
  background: var(--cream);
  color: var(--char);
  font-family: var(--font-body);
  line-height: 1.9;
  overflow-x: hidden;
}

.page-about h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.2;
  color: var(--ink);
  margin: 12px 0 18px;
  letter-spacing: -0.005em;
}

.page-about h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .section-head {
  margin-bottom: 40px;
}

.page-about .band--ink h2 {
  color: var(--glint);
}

.page-about .band--ink h3 {
  color: var(--cream);
}

.page-about .band--ink .lede {
  color: rgba(246, 241, 231, 0.84);
}

.page-about .band--ink .prose {
  color: rgba(246, 241, 231, 0.8);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: 10px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 34px;
  grid-template-columns: 1fr;
  align-items: end;
}

.page-about .ab-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 68px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 14px 0 20px;
}

.page-about .ab-hero__lede {
  max-width: 40em;
  margin: 0;
}

.page-about .ab-note {
  position: relative;
  background: linear-gradient(152deg, var(--paper) 44%, rgba(240, 223, 174, 0.62) 100%);
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-lg);
  padding: 24px 26px 22px;
  transform: rotate(-1.4deg);
}

.page-about .ab-note__k {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--gold);
  font-weight: 700;
}

.page-about .ab-note__v {
  margin: 6px 0 18px;
  font-family: var(--font-head);
  font-size: 34px;
  font-weight: 900;
  color: var(--ink);
  line-height: 1.2;
}

.page-about .ab-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .ab-note__list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  border-top: 2px solid rgba(185, 179, 166, 0.55);
  padding-top: 9px;
  font-size: 14px;
  color: rgba(42, 46, 51, 0.78);
}

.page-about .ab-note__list b {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 四类服务 ---------- */
.page-about .ab-brief__grid {
  display: grid;
  gap: 40px;
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .ab-svc {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 3px solid var(--ink);
}

.page-about .ab-svc li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 2px 14px;
  padding: 18px 0;
  border-bottom: 2px solid rgba(185, 179, 166, 0.55);
}

.page-about .ab-svc .num {
  grid-row: 1 / 3;
  font-size: 15px;
  line-height: 1.5;
  padding-top: 3px;
}

.page-about .ab-svc h3 {
  grid-column: 2;
  margin: 0;
  font-size: 18px;
}

.page-about .ab-svc p {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(42, 46, 51, 0.86);
}

/* ---------- 版本时间轴 ---------- */
.page-about .ab-road__figure {
  margin: 0 0 46px;
  max-width: 520px;
}

.page-about .ab-road__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  background: linear-gradient(150deg, var(--stone), var(--ink));
}

.page-about .ab-road__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(42, 46, 51, 0.7);
}

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

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 23px;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--stone) 0%, var(--gold) 58%, var(--amber) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 42px 66px;
}

.page-about .ab-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--paper);
  border: 3px solid var(--ink);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--ink);
  z-index: 1;
}

.page-about .ab-tl__item--now .ab-tl__num {
  background: linear-gradient(140deg, var(--amber), var(--gold));
  color: var(--night);
  box-shadow: 0 0 0 7px rgba(200, 155, 60, 0.2);
}

.page-about .ab-tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .ab-tl__tag {
  font-size: 12px;
  letter-spacing: 0.16em;
  padding: 3px 12px;
  border-radius: var(--pill);
  border: 2px solid var(--stone);
  color: rgba(42, 46, 51, 0.78);
  white-space: nowrap;
}

.page-about .ab-tl__item--now .ab-tl__tag {
  border-color: var(--gold);
  color: var(--gold);
  font-weight: 700;
}

.page-about .ab-tl__title {
  font-family: var(--font-head);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 900;
  line-height: 1.32;
  color: var(--ink);
  margin: 0;
}

.page-about .ab-tl__item > p {
  margin: 0;
  max-width: 42em;
  color: rgba(42, 46, 51, 0.9);
}

.page-about .ab-tl__more {
  margin-top: 12px;
  border-top: 2px solid rgba(185, 179, 166, 0.55);
}

.page-about .ab-tl__more > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 0 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  transition: color 0.25s var(--ease);
}

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

.page-about .ab-tl__more > summary:hover {
  color: var(--gold);
}

.page-about .ab-tl__more > summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 16px;
  line-height: 1;
  color: var(--gold);
  transition: transform 0.28s var(--ease);
}

.page-about .ab-tl__more[open] > summary::after {
  transform: rotate(135deg);
}

.page-about .ab-tl__more p {
  margin: 10px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(42, 46, 51, 0.84);
  animation: ab-fade 0.3s var(--ease);
}

@keyframes ab-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: 36px;
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .ab-team__media img,
.page-about .ab-partners__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-lg);
  background: linear-gradient(150deg, var(--stone), var(--ink));
}

.page-about .ab-roles {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-roles li {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-hard);
  padding: 16px 18px 18px;
}

.page-about .ab-roles h3 {
  font-size: 18px;
  margin: 0 0 6px;
}

.page-about .ab-roles p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(42, 46, 51, 0.86);
}

/* ---------- 覆盖与规模 ---------- */
.page-about .ab-reach .section-head {
  margin-bottom: 12px;
}

.page-about .ab-stats {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin-top: 40px;
}

.page-about .ab-stat {
  border-top: 3px solid rgba(240, 223, 174, 0.5);
  padding-top: 14px;
  min-width: 0;
}

.page-about .ab-stat__num {
  display: block;
  font-weight: 900;
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1;
  letter-spacing: -0.015em;
  color: var(--glint);
}

.page-about .ab-stat__unit {
  font-size: 0.44em;
  margin-left: 3px;
  color: var(--amber);
}

.page-about .ab-stat p {
  margin: 9px 0 0;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: rgba(246, 241, 231, 0.7);
}

.page-about .ab-reach__tail {
  margin-top: 34px;
  font-size: 15px;
  max-width: 46em;
}

/* ---------- 合作与资质 ---------- */
.page-about .ab-partners__grid {
  display: grid;
  gap: 36px;
  grid-template-columns: 1fr;
  align-items: center;
}

.page-about .ab-partners__media {
  margin: 0;
}

.page-about .ab-badges {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.page-about .ab-badges li {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-hard);
  padding: 13px 16px 15px;
}

.page-about .ab-badges b {
  display: block;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 900;
  color: var(--ink);
  line-height: 1.4;
}

.page-about .ab-badges span {
  display: block;
  font-size: 13px;
  color: rgba(42, 46, 51, 0.72);
}

/* ---------- 做法清单 ---------- */
.page-about .ab-how__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 3px solid var(--ink);
}

.page-about .ab-how__list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 0 16px;
  align-items: start;
  padding: 20px 0 22px;
  border-bottom: 2px solid rgba(185, 179, 166, 0.55);
}

.page-about .ab-how__n {
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .ab-how__list h3 {
  margin: 0 0 5px;
  font-size: 19px;
}

.page-about .ab-how__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(42, 46, 51, 0.86);
}

/* ---------- 继续浏览 ---------- */
.page-about .ab-next__grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.page-about .ab-next__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 22px 20px;
  text-decoration: none;
  color: inherit;
  background: var(--paper);
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease), background-color 0.28s var(--ease);
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-hard-lg);
  background: linear-gradient(150deg, var(--paper) 42%, rgba(240, 223, 174, 0.66) 100%);
}

.page-about .ab-next__card h3 {
  margin: 0;
  font-size: 20px;
}

.page-about .ab-next__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(42, 46, 51, 0.84);
}

.page-about .ab-next__go {
  margin-top: auto;
  padding-top: 10px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
}

/* ---------- 响应式 ---------- */
@media (max-width: 620px) {
  .page-about .ab-tl::before {
    left: 19px;
  }

  .page-about .ab-tl__item {
    padding-left: 58px;
    padding-bottom: 36px;
  }

  .page-about .ab-tl__num {
    width: 40px;
    height: 40px;
    font-size: 13px;
  }

  .page-about .ab-note {
    transform: none;
  }

  .page-about .ab-how__list li {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 0 12px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 1.35fr 0.75fr;
    gap: 60px;
  }

  .page-about .ab-brief__grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 68px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 64px;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 64px;
  }

  .page-about .ab-team__media {
    position: sticky;
    top: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}