/* ===== 关于欧凯 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  --ab-paper-hair: rgba(18, 33, 46, .16);
  --ab-lead-size: clamp(16px, 1.25vw, 18px);
  position: relative;
  overflow-x: clip;
}

.page-about .section {
  padding-block: clamp(46px, 6vw, 96px);
}

.page-about .lede {
  color: var(--muted);
  line-height: 1.78;
}

.page-about .section--paper {
  color: var(--paper-text);
}

.page-about .section--paper a {
  color: var(--paper-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .section--paper .ab-chapter__title {
  color: var(--paper-text);
}

.page-about .section--paper .ab-chapter__index {
  -webkit-text-stroke-color: var(--paper-accent);
  text-stroke: 1.5px var(--paper-accent);
}

.page-about .section--paper .media__caption {
  color: rgba(18, 33, 46, .62);
}

/* ---- 面包屑 ---- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 22px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .07em;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}

.page-about .breadcrumbs a:hover {
  border-bottom-color: currentColor;
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--text);
}

/* ---- 首屏 ---- */
.ab-hero {
  position: relative;
  padding: clamp(26px, 4vw, 54px) 0 clamp(44px, 7vw, 96px);
  overflow: hidden;
}

.ab-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -16%;
  width: min(62vw, 660px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(148deg, rgba(255, 106, 43, .26) 0%, rgba(255, 106, 43, .03) 52%, rgba(62, 224, 214, .14) 100%);
  clip-path: polygon(46% 0, 100% 34%, 84% 100%, 12% 84%, 0 30%);
  pointer-events: none;
  z-index: 0;
}

.ab-hero::after {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: 4%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 24%, var(--orange) 60%, transparent);
  opacity: .5;
  pointer-events: none;
}

.ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 4vw, 46px);
  align-items: end;
}

.ab-hero h1 {
  margin: 12px 0 18px;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(38px, 7.2vw, 90px);
  line-height: .99;
  letter-spacing: -.005em;
  color: var(--text);
}

.ab-hero h1 em {
  font-style: normal;
  color: var(--cyan);
  display: inline-block;
}

.ab-hero .lede {
  max-width: 58ch;
  font-size: var(--ab-lead-size);
}

.ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.ab-hero__facts .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px 18px;
  background: rgba(18, 42, 63, .8);
}

.ab-hero__facts .stat__value {
  font-family: var(--mono);
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.ab-hero__facts .stat__label {
  font-size: 12px;
  line-height: 1.45;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---- 色带 ---- */
.page-about .band {
  height: 8px;
  background: linear-gradient(90deg, var(--orange) 0 22%, var(--cyan) 22% 58%, rgba(159, 176, 192, .32) 58% 100%);
  opacity: .9;
}

/* ---- 章节标题 ---- */
.ab-chapter {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 22px);
  margin: 0 0 clamp(20px, 2.6vw, 34px);
}

.ab-chapter__index {
  flex: none;
  font-family: var(--mono);
  font-size: clamp(30px, 4.6vw, 58px);
  font-weight: 700;
  line-height: .9;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--orange);
  text-stroke: 1.5px var(--orange);
}

.ab-chapter__title {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 44px);
  line-height: 1.14;
  color: var(--text);
}

.ab-lead {
  max-width: 64ch;
  margin: 0 0 clamp(24px, 3vw, 38px);
  font-size: var(--ab-lead-size);
  line-height: 1.78;
  color: var(--muted);
}

/* ---- 起点 ---- */
.ab-origin__grid {
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}

.ab-origin__body p {
  margin: 0 0 1em;
  font-size: var(--ab-lead-size);
  line-height: 1.8;
}

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

.ab-origin__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.ab-origin__points li {
  padding: 10px 0 10px 16px;
  border-left: 3px solid var(--paper-accent);
  font-size: 15px;
  line-height: 1.65;
}

.ab-origin__points strong {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--paper-accent);
  margin-right: 8px;
}

/* ---- 图片容器 ---- */
.page-about .media {
  margin: 0;
}

.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__caption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: .05em;
  color: var(--muted);
}

/* ---- 团队 ---- */
.ab-team__figure {
  margin: 0 0 clamp(26px, 3.5vw, 44px);
}

.ab-team__grid {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 258px), 1fr));
}

.ab-role {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  background: linear-gradient(180deg, rgba(18, 42, 63, .94), rgba(11, 27, 43, .94));
  border: 1px solid var(--hair);
  border-top: 3px solid var(--cyan);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}

.ab-role:nth-child(2) {
  border-top-color: var(--orange);
}

.ab-role:nth-child(3) {
  border-top-color: var(--lime);
}

.ab-role:hover,
.ab-role:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: 8px 8px 0 rgba(7, 17, 28, .55);
}

.ab-role__head {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.ab-role__count {
  font-family: var(--mono);
  font-size: clamp(30px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.ab-role__unit {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
}

.ab-role h3 {
  margin: 14px 0 10px;
  font-family: var(--display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--text);
}

.ab-role p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.74;
  color: var(--muted);
}

.ab-role a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.ab-role__keys {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ab-role__keys li {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  padding: 4px 8px;
  color: var(--cyan);
  border: 1px solid var(--hair);
  background: rgba(62, 224, 214, .06);
}

/* ---- 版本长卷 ---- */
.ab-versions__figure {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hair-soft);
}

.ab-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: clamp(10px, 2vw, 22px);
  padding: clamp(14px, 1.8vw, 20px) 0 clamp(14px, 1.8vw, 20px) 16px;
  border-bottom: 1px solid var(--hair-soft);
}

.ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
}

.ab-timeline__item.is-key::before {
  background: linear-gradient(180deg, var(--orange), rgba(255, 106, 43, 0));
}

.ab-timeline__ver {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
  padding-top: 2px;
}

.ab-timeline__item.is-key .ab-timeline__ver {
  color: var(--orange);
}

.ab-timeline__key {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 7px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--orange);
  vertical-align: middle;
}

.page-about .ab-timeline .disclosure {
  border: 0;
  background: none;
  padding: 0;
  margin: 0;
}

.page-about .ab-timeline summary.disclosure__q {
  list-style: none;
  position: relative;
  display: block;
  padding-right: 28px;
  cursor: pointer;
  font-size: clamp(15px, 1.2vw, 17px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

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

.page-about .ab-timeline summary.disclosure__q::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1.3;
  color: var(--cyan);
}

.page-about .ab-timeline details[open] summary.disclosure__q::after {
  content: "–";
  color: var(--orange);
}

.page-about .ab-timeline .disclosure__a {
  padding-top: 10px;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .ab-timeline .disclosure__a p {
  margin: 0;
}

/* ---- 大陆版适配 ---- */
.ab-adapt__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.ab-adapt__copy p {
  margin: 0 0 1em;
  font-size: var(--ab-lead-size);
  line-height: 1.8;
}

.ab-adapt__list {
  list-style: none;
  margin: clamp(16px, 2vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.ab-adapt__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
}

.ab-adapt__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 9px;
  height: 9px;
  background: var(--paper-accent);
  transform: rotate(45deg);
}

.ab-adapt__figure {
  margin: 0;
}

/* ---- 服务 ---- */
.ab-service__list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--hair-soft);
  border: 1px solid var(--hair-soft);
}

.ab-service__row {
  padding: clamp(18px, 2.2vw, 26px);
  background: rgba(18, 42, 63, .62);
}

.ab-service__row dt {
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.ab-service__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--muted);
}

.ab-service__row dd strong {
  color: var(--text);
  font-weight: 600;
}

.ab-service__row dd a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.ab-service__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .copy-btn {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 10px 16px;
  color: var(--cyan);
  background: transparent;
  border: 1px solid var(--hair);
  cursor: pointer;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.page-about .copy-btn:hover {
  border-color: var(--cyan);
  background: rgba(62, 224, 214, .08);
}

.page-about .copy-btn[data-copied] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

/* ---- 合作与维护 ---- */
.ab-partners__grid {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.ab-partners__intro p {
  margin: 0 0 1em;
  font-size: var(--ab-lead-size);
  line-height: 1.8;
  color: var(--muted);
}

.ab-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hair-soft);
}

.ab-partners__list li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hair-soft);
}

.ab-partners__k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--orange);
}

.ab-partners__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.ab-endnav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(6px, 1vw, 12px);
}

/* ---- 桌面布局 ---- */
@media (min-width: 940px) {
  .ab-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .8fr);
    column-gap: clamp(36px, 5vw, 72px);
  }
}

@media (min-width: 980px) {
  .ab-adapt__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    column-gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .ab-origin__grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    column-gap: clamp(40px, 6vw, 96px);
    row-gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }

  .ab-origin__chapter {
    grid-column: 1;
    grid-row: 1;
  }

  .ab-origin__body {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .ab-origin__points {
    grid-column: 1;
    grid-row: 2;
  }

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

  .ab-partners__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    column-gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }

  .ab-endnav {
    grid-column: 2;
  }
}

/* ---- 窄屏收敛 ---- */
@media (max-width: 620px) {
  .page-about .breadcrumbs {
    padding-top: 16px;
    font-size: 11px;
  }

  .ab-timeline__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    padding-left: 14px;
  }

  .ab-timeline__ver {
    padding-top: 0;
  }

  .ab-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .ab-hero::before {
    width: min(84vw, 420px);
    top: -22%;
    right: -26%;
  }
}

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

  .page-about .ab-role:hover,
  .page-about .ab-role:focus-within {
    transform: none;
  }
}
<<<END>>>