.page-about {
  --ab-line: rgba(212, 175, 55, .32);
  --ab-hair: rgba(11, 61, 46, .10);
  --ab-soft: #4A5158;
  --ab-on-deep: rgba(246, 242, 233, .78);
  display: block;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.28;
  color: var(--ink);
  margin: 0;
}

.page-about p { margin: 0; }

.page-about a { color: inherit; }

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  background: var(--deep);
  color: var(--paper);
  padding: 34px 0 116px;
  overflow: hidden;
  isolation: isolate;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 54px), 0 100%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    repeating-linear-gradient(45deg, rgba(212, 175, 55, .055) 0 1px, transparent 1px 15px),
    radial-gradient(120% 88% at 92% -6%, rgba(18, 194, 176, .22), transparent 62%),
    linear-gradient(200deg, rgba(212, 175, 55, .10) 0 1px, transparent 1px 100%);
  pointer-events: none;
}

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

.page-about .ab-hero .breadcrumb__link,
.page-about .ab-hero .breadcrumb__sep {
  color: rgba(246, 242, 233, .62);
}

.page-about .ab-hero .breadcrumb__current {
  color: var(--gold);
}

.page-about .ab-hero .breadcrumb__link:hover {
  color: var(--gold);
}

.page-about .ab-hero__eyebrow {
  margin: 26px 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .ab-hero__title {
  font-size: clamp(31px, 7.4vw, 58px);
  line-height: 1.18;
  letter-spacing: -.012em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .ab-hero__title span {
  color: var(--gold);
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .ab-hero__lede {
  margin-top: 22px;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ab-on-deep);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .ab-stats {
  margin: 44px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(212, 175, 55, .30);
  border: 1px solid rgba(212, 175, 55, .30);
}

.page-about .ab-stat {
  background: var(--deep-2);
  padding: 18px 16px 20px;
}

.page-about .ab-stat__k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .ab-stat__v {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 32px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--paper);
}

.page-about .ab-stat__u {
  font-size: 12.5px;
  font-weight: 400;
  color: rgba(246, 242, 233, .62);
  margin-left: 5px;
  letter-spacing: .04em;
}

.page-about .ab-stat__d {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(246, 242, 233, .58);
}

/* ---------- 通用章节 ---------- */

.page-about .ab-sec {
  padding: 54px 0;
}

.page-about .ab-head {
  max-width: 760px;
  margin: 0 0 32px;
  padding-top: 16px;
  border-top: 2px solid var(--gold);
}

.page-about .ab-head__num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold-dark);
}

.page-about .ab-head__title {
  font-size: clamp(23px, 5vw, 33px);
  margin: 0 0 14px;
}

.page-about .ab-head__lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ab-soft);
}

/* ---------- 01 三件事 ---------- */

.page-about .ab-pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .ab-pillar {
  position: relative;
  padding: 24px 22px 30px;
  background:
    linear-gradient(var(--gold), var(--gold)) top left / 100% 3px no-repeat,
    linear-gradient(180deg, #FFFFFF 0%, #FCF9F3 100%);
  box-shadow: inset 0 0 0 1px var(--ab-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-pillar__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold-dark);
}

.page-about .ab-pillar h3 {
  font-size: 19px;
  margin: 0 0 12px;
  line-height: 1.42;
}

.page-about .ab-pillar p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-soft);
}

/* ---------- 02 三个小组 ---------- */

.page-about .ab-crews {
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-crew {
  display: grid;
  gap: 12px;
  padding: 24px 0;
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-crew__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .ab-crew__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold-dark);
}

.page-about .ab-crew__name {
  font-size: 20px;
}

.page-about .ab-crew__body p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-soft);
  margin-bottom: 14px;
}

.page-about .ab-crew__body a {
  color: var(--deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
}

.page-about .ab-crew__body a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .ab-crew__out {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-about .ab-crew__out li {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--deep);
  background: var(--paper-warm);
  padding: 5px 10px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

/* ---------- 图片容器 ---------- */

.page-about .ab-figure {
  position: relative;
  margin: 0 0 30px;
  overflow: hidden;
  background: var(--deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .ab-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(158deg, rgba(11, 61, 46, .34) 0%, rgba(22, 24, 26, .62) 100%);
  pointer-events: none;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) contrast(1.04);
}

.page-about .ab-figure figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  margin: 0;
  padding: 9px 16px;
  background: rgba(11, 61, 46, .88);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
}

.page-about .ab-figure--net {
  margin: 30px 0 0;
}

/* ---------- 03 工序 ---------- */

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .ab-step {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--paper-warm);
  box-shadow: inset 3px 0 0 0 var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background-color .2s ease;
}

.page-about .ab-step:hover {
  background: #F7EEDA;
}

.page-about .ab-step__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--gold-dark);
}

.page-about .ab-step h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.page-about .ab-step p {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ab-soft);
  margin-bottom: 12px;
}

.page-about .ab-step__out {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .06em;
  color: var(--deep);
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
}

/* ---------- 04 协作网络 ---------- */

.page-about .ab-network {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-region {
  padding: 22px 20px 24px;
  background: var(--deep);
  color: var(--paper);
  clip-path: polygon(0 18px, 18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: background-color .2s ease;
}

.page-about .ab-region:hover {
  background: var(--deep-2);
}

.page-about .ab-region__id {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .ab-region h3 {
  font-size: 19px;
  color: var(--paper);
  margin: 8px 0 6px;
}

.page-about .ab-region__count {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .ab-region p {
  font-size: 14px;
  line-height: 1.78;
  color: rgba(246, 242, 233, .76);
}

/* ---------- 05 时间轴 ---------- */

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

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 11px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--cyan) 58%, rgba(212, 175, 55, .22) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 28px 34px;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--paper);
  box-shadow: 0 0 0 2px var(--gold);
  transform: rotate(45deg);
}

.page-about .ab-tl__card {
  padding: 18px 18px 20px;
  margin-bottom: 12px;
  box-shadow: inset 0 0 0 1px var(--ab-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .ab-tl__card--season {
  background:
    linear-gradient(var(--gold), var(--gold)) top left / 100% 3px no-repeat,
    #FFFFFF;
}

.page-about .ab-tl__card--ver {
  background:
    linear-gradient(var(--cyan), var(--cyan)) top left / 100% 3px no-repeat,
    #FBF8F1;
}

.page-about .ab-tl__kind {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
}

.page-about .ab-tl__card--season .ab-tl__kind {
  color: var(--gold-dark);
  background: rgba(212, 175, 55, .16);
}

.page-about .ab-tl__card--ver .ab-tl__kind {
  color: #0A7A6E;
  background: rgba(18, 194, 176, .16);
}

.page-about .ab-tl__stamp {
  display: block;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--deep);
  margin-bottom: 6px;
}

.page-about .ab-tl__card h3 {
  font-size: 16.5px;
  margin-bottom: 8px;
}

.page-about .ab-tl__card p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--ab-soft);
}

/* ---------- 06 纠错 ---------- */

.page-about .ab-fix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-bottom: 26px;
}

.page-about .ab-fix__col {
  padding: 22px 20px 24px;
  background: #FFFFFF;
  border-left: 3px solid var(--gold);
}

.page-about .ab-fix__col h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.page-about .ab-fix__col p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-soft);
}

.page-about .ab-fix__col a {
  color: var(--deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-about .ab-fix__col a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .ab-cases {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .ab-case {
  padding: 18px 18px 20px;
  background: var(--paper-warm);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .ab-case h4 {
  font-size: 15.5px;
  margin-bottom: 7px;
  color: var(--deep);
}

.page-about .ab-case p {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ab-soft);
}

/* ---------- 07 定制资料 ---------- */

.page-about .ab-orders {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-order {
  position: relative;
  padding: 26px 22px 28px;
  background: #FFFFFF;
  box-shadow: inset 0 0 0 1px var(--ab-hair);
  border-top: 3px solid var(--deep);
}

.page-about .ab-order__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold-dark);
}

.page-about .ab-order h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.page-about .ab-order > p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-soft);
}

.page-about .ab-order__use {
  margin-top: 14px !important;
  display: inline-block;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--deep);
  background: rgba(18, 194, 176, .14);
}

/* ---------- 结尾行动区 ---------- */

.page-about .ab-cta {
  background: var(--deep);
  color: var(--paper);
  padding: 52px 0 60px;
  margin-top: 10px;
  clip-path: polygon(0 42px, 100% 0, 100% 100%, 0 100%);
}

.page-about .ab-cta__text h2 {
  font-size: clamp(22px, 5vw, 30px);
  color: var(--paper);
  margin-bottom: 14px;
}

.page-about .ab-cta__text p {
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ab-on-deep);
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 720px) {
  .page-about .ab-sec { padding: 76px 0; }
  .page-about .ab-hero { padding: 44px 0 132px; }

  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-crew {
    grid-template-columns: 230px minmax(0, 1fr);
    gap: 34px;
    padding: 28px 0;
  }

  .page-about .ab-fix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

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

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

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

  .page-about .ab-cta__inner {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 40px;
  }

  .page-about .ab-cta__links {
    margin-top: 0;
    flex: 0 0 auto;
  }
}

@media (min-width: 900px) {
  .page-about .ab-sec { padding: 92px 0; }
  .page-about .ab-hero { padding: 52px 0 150px; }

  .page-about .ab-pillars {
    grid-template-columns: 1.12fr 1fr .88fr;
    gap: 22px;
    align-items: start;
  }

  .page-about .ab-pillar:nth-child(2) { margin-top: 30px; }
  .page-about .ab-pillar:nth-child(3) { margin-top: 60px; }

  .page-about .ab-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
  }

  .page-about .ab-step {
    padding: 22px 15px 24px;
  }

  .page-about .ab-step h3 { font-size: 15.5px; }
  .page-about .ab-step p { font-size: 13px; }

  .page-about .ab-figure--net {
    max-width: 820px;
  }

  .page-about .ab-tl::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .ab-tl__item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 56px;
    padding: 0 0 42px;
  }

  .page-about .ab-tl__item::before {
    left: 50%;
    top: 12px;
    margin-left: -6px;
  }

  .page-about .ab-tl__card {
    margin-bottom: 0;
  }

  .page-about .ab-tl__card--season {
    justify-self: end;
    width: 100%;
  }

  .page-about .ab-tl__card--ver {
    justify-self: start;
    width: 100%;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-network {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-region:nth-child(2) { margin-top: 20px; }
  .page-about .ab-region:nth-child(3) { margin-top: 8px; }
  .page-about .ab-region:nth-child(4) { margin-top: 28px; }
}

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