/* ===== 品牌档案 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  --ab-rail-w: 168px;
  --ab-flow-gap: clamp(64px, 8vw, 128px);
  position: relative;
  background: var(--void);
  color: var(--ice);
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(124, 77, 255, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 77, 255, .055) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(130% 70% at 50% 0%, #000 18%, transparent 76%);
  mask-image: radial-gradient(130% 70% at 50% 0%, #000 18%, transparent 76%);
  z-index: 0;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding-block: clamp(36px, 5vw, 64px) clamp(56px, 8vw, 108px);
  background:
    radial-gradient(120% 92% at 84% -6%, rgba(124, 77, 255, .26), transparent 62%),
    radial-gradient(88% 68% at 4% 14%, rgba(52, 231, 228, .10), transparent 60%);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: -4%;
  right: -4%;
  bottom: -1px;
  height: 90px;
  background: linear-gradient(90deg, rgba(124, 77, 255, .30), rgba(52, 231, 228, .14) 58%, transparent);
  clip-path: polygon(0 66%, 100% 0, 100% 100%, 0 100%);
  opacity: .42;
  pointer-events: none;
}

.page-about .ab-hero .breadcrumbs {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--graphite);
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .ab-hero .breadcrumbs a {
  color: var(--graphite);
  text-decoration: none;
}

.page-about .ab-hero .breadcrumbs a:hover,
.page-about .ab-hero .breadcrumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .ab-hero .breadcrumbs span[aria-current="page"] {
  color: var(--ice);
}

.page-about .ab-hero__collage {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .ab-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-about .ab-hero__lede {
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.86;
  color: rgba(242, 240, 255, .8);
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__aside {
  position: relative;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.page-about .ab-hero__aside > .annot {
  display: block;
  margin: 0 0 18px;
  color: var(--graphite);
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-stat {
  display: grid;
  gap: 3px;
}

.page-about .ab-stat__value {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(24px, 2.6vw, 32px);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .ab-stat__unit {
  font-size: .58em;
  margin-left: 3px;
  color: rgba(52, 231, 228, .72);
}

.page-about .ab-stat__label {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  color: var(--graphite);
}

/* ---------- 主体：左轴 + 内容流 ---------- */

.page-about .ab-stream {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
  padding-block: clamp(48px, 6vw, 84px) clamp(72px, 9vw, 132px);
}

.page-about .ab-rail {
  position: relative;
}

.page-about .ab-rail__kicker {
  margin: 0 0 16px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--graphite);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  position: relative;
}

.page-about .ab-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-rail__item {
  flex: 0 0 auto;
}

.page-about .ab-rail__node {
  display: grid;
  grid-template-columns: 14px auto;
  align-items: center;
  gap: 8px;
  padding: 7px 12px 7px 9px;
  text-decoration: none;
  color: var(--graphite);
  border: 1px solid var(--line-soft);
  white-space: nowrap;
}

.page-about .ab-rail__ring {
  display: block;
}

.page-about .ab-rail__ring circle {
  fill: var(--void);
  stroke: rgba(124, 77, 255, .8);
  stroke-width: 1.4;
  transition: fill .25s ease, stroke .25s ease;
}

.page-about .ab-rail__node:hover .ab-rail__ring circle,
.page-about .ab-rail__node:focus-visible .ab-rail__ring circle {
  fill: var(--cyan);
  stroke: var(--cyan);
}

.page-about .ab-rail__meta {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .ab-rail__name {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--ice);
}

.page-about .ab-rail__year {
  font-family: var(--font-data);
  font-size: 11px;
  font-style: normal;
  letter-spacing: .02em;
  color: var(--graphite);
}

.page-about .ab-flow {
  display: grid;
  gap: var(--ab-flow-gap);
  min-width: 0;
}

.page-about .ab-chapter {
  position: relative;
  scroll-margin-top: 110px;
}

.page-about .ab-chapter > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-head {
  margin-bottom: clamp(26px, 3.6vw, 46px);
}

.page-about .ab-head__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .ab-head__eyebrow::before {
  content: "";
  display: inline-block;
  width: 26px;
  height: 1px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--cyan);
  opacity: .7;
}

.page-about .ab-head__title {
  margin: 0;
  max-width: 24ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3.3vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ice);
}

.page-about .ab-head__lede {
  margin: 16px 0 0;
  max-width: 56ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.82;
  color: var(--graphite);
}

/* ---------- 通用正文列 ---------- */

.page-about .ab-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
}

.page-about .ab-text p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.86;
  color: rgba(242, 240, 255, .8);
}

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

.page-about .ab-text p:first-child::first-letter {
  float: left;
  margin: 4px 10px 0 0;
  font-family: var(--font-data);
  font-size: 46px;
  line-height: .82;
  font-weight: 700;
  color: var(--violet);
}

.page-about .ab-aside {
  display: grid;
  gap: 6px;
  align-content: start;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.page-about .ab-aside__num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(48px, 7vw, 84px);
  line-height: .9;
  letter-spacing: .01em;
  color: transparent;
  -webkit-text-stroke: 1.4px rgba(52, 231, 228, .8);
}

.page-about .ab-aside__cap {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 图片块 ---------- */

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

.page-about .ab-shot__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 32px 100%, 0 calc(100% - 32px));
  filter: saturate(.92) contrast(1.04);
  background: var(--panel);
}

.page-about .ab-shot__cap {
  margin: 12px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  line-height: 1.65;
  color: var(--graphite);
}

.page-about .ab-shot--wide {
  margin-bottom: clamp(28px, 4vw, 48px);
}

/* ---------- 工序列表 ---------- */

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

.page-about .ab-step {
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-step:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-step__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .ab-step__no {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--violet);
}

.page-about .ab-step__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-step__text {
  margin: 10px 0 12px;
  max-width: 56ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 240, 255, .74);
}

.page-about .note-toggle {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cyan);
  background: transparent;
  border: 0;
  border-bottom: 1px dashed rgba(52, 231, 228, .55);
  padding: 2px 0;
  cursor: pointer;
}

.page-about .note-toggle:hover,
.page-about .note-toggle:focus-visible {
  color: var(--ice);
  border-bottom-color: var(--ice);
  outline: none;
}

.page-about .note-body {
  margin-top: 10px;
  max-width: 56ch;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--graphite);
  padding-left: 14px;
  border-left: 2px solid var(--violet);
}

/* ---------- 时间线 ---------- */

.page-about #timeline::before {
  content: "";
  position: absolute;
  inset: -4% -6% -4% -8%;
  background: radial-gradient(66% 58% at 18% 42%, rgba(30, 26, 51, .92), transparent 74%);
  z-index: 0;
  pointer-events: none;
}

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

.page-about .ab-line__node {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-line__node:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-line__mark {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .ab-line__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--slate);
  border: 1px solid var(--slate);
  flex: 0 0 auto;
  transition: background .35s ease, border-color .35s ease, box-shadow .35s ease;
}

.page-about .ab-line__node.is-lit .ab-line__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(52, 231, 228, .14);
}

.page-about .ab-line__year {
  font-family: var(--font-data);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .ab-line__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-line__body p {
  margin: 0;
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 240, 255, .76);
}

/* ---------- 合作网络 ---------- */

.page-about .ab-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-partners__item {
  position: relative;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-partners__item::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .32s ease;
}

.page-about .ab-partners__item:hover::before,
.page-about .ab-partners__item:focus-within::before {
  transform: scaleY(1);
}

.page-about .ab-partners__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-partners__text {
  margin: 0 0 12px;
  max-width: 46ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(242, 240, 255, .76);
}

.page-about .ab-partners__meta {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--magenta);
}

.page-about .ab-chapter__foot {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
}

.page-about .ab-chapter__foot .btn {
  text-decoration: none;
}

/* ---------- 团队构成 ---------- */

.page-about .ab-team {
  margin-bottom: clamp(34px, 4.5vw, 56px);
}

.page-about .ab-team__bar {
  display: flex;
  width: 100%;
  height: 54px;
  border: 1px solid var(--line);
  background: var(--deep);
  overflow: hidden;
}

.page-about .ab-team__seg {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: filter .25s ease;
}

.page-about .ab-team__seg:nth-child(1) {
  width: 33.8%;
  background: linear-gradient(160deg, rgba(124, 77, 255, .85), rgba(124, 77, 255, .45));
}

.page-about .ab-team__seg:nth-child(2) {
  width: 45.6%;
  background: linear-gradient(160deg, rgba(52, 231, 228, .72), rgba(52, 231, 228, .3));
}

.page-about .ab-team__seg:nth-child(3) {
  width: 20.6%;
  background: linear-gradient(160deg, rgba(255, 122, 47, .78), rgba(255, 122, 47, .34));
}

.page-about .ab-team__seg + .ab-team__seg {
  border-left: 1px solid var(--void);
}

.page-about .ab-team__seg:hover,
.page-about .ab-team__seg:focus-within {
  filter: brightness(1.18);
}

.page-about .ab-team__tip {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .03em;
  color: var(--void);
  font-weight: 700;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity .24s ease, transform .24s ease;
}

.page-about .ab-team__seg:hover .ab-team__tip,
.page-about .ab-team__seg:focus-within .ab-team__tip {
  opacity: 1;
  transform: translateY(0);
}

.page-about .ab-team__legend {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  font-family: var(--font-body);
  font-size: 13.5px;
  color: rgba(242, 240, 255, .78);
}

.page-about .ab-team__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .ab-team__legend b {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--cyan);
}

.page-about .ab-team__key {
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
}

.page-about .ab-team__key--a { background: rgba(124, 77, 255, .85); }
.page-about .ab-team__key--b { background: rgba(52, 231, 228, .72); }
.page-about .ab-team__key--c { background: rgba(255, 122, 47, .78); }

/* ---------- 准则 ---------- */

.page-about .ab-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .ab-rules__item {
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-rules__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-rules__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-rules__title::before {
  content: "▚";
  margin-right: 10px;
  font-size: 13px;
  color: var(--violet);
}

.page-about .ab-rules__item p {
  margin: 0;
  max-width: 56ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 240, 255, .74);
}

.page-about .ab-team__note {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  max-width: 58ch;
  padding-left: 18px;
  border-left: 2px solid var(--orange);
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--graphite);
}

/* ---------- 收尾行动块 ---------- */

.page-about .ab-cta {
  margin-top: clamp(34px, 4.5vw, 56px);
  padding: clamp(26px, 4vw, 44px);
  display: grid;
  gap: 22px;
  background:
    linear-gradient(120deg, rgba(124, 77, 255, .2), rgba(52, 231, 228, .09) 72%, transparent);
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 32px 100%, 0 calc(100% - 32px));
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 34ch;
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 平板及以上 ---------- */

@media (min-width: 760px) {
  .page-about .ab-hero__collage {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 clamp(22px, 3vw, 44px);
  }

  .page-about .ab-partners__item {
    border-bottom: 0;
    border-top: 1px solid var(--line-soft);
    padding-top: 26px;
  }

  .page-about .ab-partners__item::before {
    left: 0;
    top: 0;
    bottom: auto;
    width: 100%;
    height: 2px;
    transform: scaleX(0);
    transform-origin: left;
  }

  .page-about .ab-partners__item:hover::before,
  .page-about .ab-partners__item:focus-within::before {
    transform: scaleX(1);
  }

  .page-about .ab-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(24px, 3vw, 48px);
  }

  .page-about .ab-rules__item:last-child {
    border-bottom: 0;
  }

  .page-about .ab-rules__item:nth-last-child(-n+2) {
    border-bottom: 1px solid var(--line-soft);
  }

  .page-about .ab-line__node {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .ab-line__mark {
    padding-top: 4px;
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

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

/* ---------- 桌面：左轴常驻 ---------- */

@media (min-width: 960px) {
  .page-about .ab-stream {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 64px);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .ab-rail__list {
    display: grid;
    gap: 2px;
    overflow: visible;
  }

  .page-about .ab-rail__list::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(180deg, transparent, rgba(124, 77, 255, .85) 12%, rgba(124, 77, 255, .85) 88%, transparent);
  }

  .page-about .ab-rail__item {
    width: 100%;
  }

  .page-about .ab-rail__node {
    grid-template-columns: 18px minmax(0, 1fr);
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border: 0;
    white-space: normal;
  }

  .page-about .ab-rail__meta {
    display: grid;
    gap: 2px;
  }

  .page-about .ab-rail__name {
    font-size: 14px;
  }

  .page-about .ab-aside {
    align-content: center;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-cols--origin {
    grid-template-columns: minmax(0, 1fr) 220px;
  }

  .page-about .ab-cols--flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, .62fr);
    align-items: start;
  }

  .page-about .ab-cols--flow .ab-shot {
    position: sticky;
    top: 112px;
  }

  .page-about .ab-cols--timeline {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-cols--timeline .ab-shot {
    position: sticky;
    top: 112px;
  }
}

/* ---------- 大屏微调 ---------- */

@media (min-width: 1280px) {
  .page-about .ab-hero h1 {
    max-width: 16ch;
  }

  .page-about .ab-team__bar {
    height: 62px;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__ring circle,
  .page-about .ab-line__dot,
  .page-about .ab-partners__item::before,
  .page-about .ab-team__seg,
  .page-about .ab-team__tip {
    transition: none;
  }
}
</style>