/* ===== 品牌历程 / history ===== */
.page-about {
  --ab-edge: 2px solid var(--sb-moss);
  --ab-soft: rgba(155, 230, 79, 0.16);
  background: var(--sb-deep);
  color: var(--sb-warm);
}

.page-about .ab-wrap {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 18px;
}

/* ---------- 通用排版 ---------- */
.page-about .ab-kicker {
  display: inline-block;
  margin: 0 0 12px;
  padding-left: 9px;
  border-left: 3px solid var(--sb-lime);
  font-family: var(--sb-font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sb-lime);
}

.page-about .ab-h2 {
  margin: 0 0 18px;
  font-family: var(--sb-font-head);
  font-weight: 300;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--sb-warm);
}

.page-about .ab-h3 {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--sb-lime);
}

.page-about .ab-p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--sb-sand);
}

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

.page-about .ab-p a {
  color: var(--sb-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(155, 230, 79, 0.45);
}

.page-about .ab-p a:hover,
.page-about .ab-p a:focus-visible {
  border-bottom-color: var(--sb-lime);
  background: rgba(155, 230, 79, 0.1);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 58vh;
  overflow: hidden;
  border-bottom: var(--ab-edge);
  background: var(--sb-deep);
}

.page-about .ab-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.5) brightness(0.6);
}

.page-about .ab-hero__wash {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(118deg, rgba(7, 26, 19, 0.97) 0%, rgba(7, 26, 19, 0.78) 46%, rgba(7, 26, 19, 0.22) 100%),
    repeating-linear-gradient(90deg, rgba(155, 230, 79, 0.045) 0 2px, transparent 2px 28px);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: -14%;
  right: -16%;
  width: 48%;
  height: 82%;
  background: var(--sb-lime);
  opacity: 0.07;
  transform: rotate(9deg);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 20% 100%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 104px 18px 38px;
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 20px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sb-stone);
}

.page-about .ab-crumb a {
  color: var(--sb-sand);
  text-decoration: none;
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--sb-lime);
}

.page-about .ab-hero__title {
  margin: 0 0 18px;
  font-family: var(--sb-font-head);
  font-weight: 300;
  font-size: clamp(34px, 7.2vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--sb-warm);
}

.page-about .ab-hero__lead {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--sb-sand);
}

.page-about .ab-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid rgba(107, 116, 109, 0.45);
}

.page-about .ab-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-hero__num {
  font-family: var(--sb-font-mono);
  font-size: 22px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sb-lime);
}

.page-about .ab-hero__cap {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sb-stone);
}

/* ---------- 主体两栏 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding: 32px 0 64px;
}

.page-about .ab-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  list-style: none;
  scrollbar-width: thin;
}

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

.page-about .ab-toc__list a {
  display: block;
  padding: 8px 12px;
  border: 1px solid var(--sb-moss);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sb-sand);
  text-decoration: none;
  white-space: nowrap;
}

.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  border-color: var(--sb-lime);
  color: var(--sb-lime);
}

/* ---------- 章节 ---------- */
.page-about .ab-chapter {
  padding: 34px 0 10px;
  border-top: var(--ab-edge);
}

.page-about .ab-chapter:first-child {
  padding-top: 8px;
  border-top: none;
}

.page-about .ab-chapter.is-current .ab-kicker {
  color: var(--sb-amber);
  border-left-color: var(--sb-amber);
}

/* ---------- 非对称双栏 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 6px;
}

.page-about .ab-split__media img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--ab-edge);
  box-shadow: var(--sb-shadow);
  object-fit: cover;
  filter: saturate(0.6);
}

/* ---------- 定位面板 ---------- */
.page-about .ab-fact {
  align-self: start;
  padding: 20px 18px;
  background: var(--sb-panel);
  border: var(--ab-edge);
  box-shadow: var(--sb-shadow);
}

.page-about .ab-fact .ab-kicker {
  color: var(--sb-amber);
  border-left-color: var(--sb-amber);
}

.page-about .ab-fact__line {
  margin: 0 0 16px;
  font-family: var(--sb-font-head);
  font-weight: 300;
  font-size: clamp(20px, 3.6vw, 26px);
  line-height: 1.32;
  color: var(--sb-warm);
}

.page-about .ab-fact__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--sb-moss);
}

.page-about .ab-fact__list li {
  padding: 10px 0 10px 18px;
  position: relative;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--sb-sand);
  border-bottom: 1px solid rgba(54, 82, 68, 0.7);
}

.page-about .ab-fact__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 8px;
  height: 2px;
  background: var(--sb-lime);
}

.page-about .ab-fact__list li:last-child {
  border-bottom: none;
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  position: relative;
  margin-top: 24px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 12px;
  bottom: 12px;
  width: 3px;
  background: linear-gradient(180deg, var(--sb-lime) 0%, var(--sb-moss) 55%, rgba(54, 82, 68, 0.25) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  margin-bottom: 12px;
}

.page-about .ab-tl__head {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px 14px 50px;
  background: var(--sb-panel);
  border: var(--ab-edge);
  cursor: pointer;
  list-style: none;
}

.page-about .ab-tl__head::-webkit-details-marker {
  display: none;
}

.page-about .ab-tl__head::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 50%;
  width: 18px;
  height: 18px;
  box-sizing: content-box;
  transform: translateY(-50%);
  border: 3px solid var(--sb-moss);
  border-radius: 50%;
  background: var(--sb-deep);
  transition: background 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-tl__head:hover {
  border-color: var(--sb-lime);
}

.page-about .ab-tl__head:focus-visible {
  outline: 2px solid var(--sb-lime);
  outline-offset: 2px;
}

.page-about .ab-tl__item[open] > .ab-tl__head {
  border-color: var(--sb-lime);
}

.page-about .ab-tl__item[open] > .ab-tl__head::before {
  background: var(--sb-lime);
  border-color: var(--sb-lime);
  box-shadow: 0 0 0 4px var(--ab-soft);
}

.page-about .ab-tl__year {
  flex: 0 0 auto;
  font-family: var(--sb-font-mono);
  font-size: 22px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--sb-lime);
}

.page-about .ab-tl__name {
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--sb-warm);
}

.page-about .ab-tl__body {
  padding: 16px 16px 4px 50px;
  border-left: 1px solid rgba(54, 82, 68, 0.8);
  margin-left: 14px;
}

.page-about .ab-tl__media {
  position: relative;
  margin: 22px 0 22px;
  border: var(--ab-edge);
  box-shadow: var(--sb-shadow);
  background: var(--sb-black);
}

.page-about .ab-tl__media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  filter: saturate(0.55) brightness(0.78);
}

.page-about .ab-tl__cap {
  margin: 0;
  padding: 10px 14px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--sb-stone);
  border-top: 1px solid var(--sb-moss);
}

/* ---------- 团队数字 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.page-about .ab-stat {
  padding: 16px 14px 14px;
  background: var(--sb-panel);
  border: var(--ab-edge);
  box-shadow: 4px 4px 0 var(--sb-black);
}

.page-about .ab-stat__n {
  display: block;
  font-family: var(--sb-font-mono);
  font-size: 38px;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--sb-lime);
}

.page-about .ab-stat--lead .ab-stat__n {
  font-size: 54px;
  color: var(--sb-amber);
}

.page-about .ab-stat__l {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sb-sand);
}

.page-about .ab-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 22px 0;
}

.page-about .ab-note {
  padding-left: 14px;
  border-left: 3px solid var(--sb-clay);
}

.page-about .ab-note .ab-p {
  font-size: 14px;
  margin-bottom: 0;
}

.page-about .ab-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px dashed var(--sb-moss);
}

.page-about .ab-inline li {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--sb-stone);
}

.page-about .ab-inline__n {
  display: block;
  font-family: var(--sb-font-mono);
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--sb-warm);
}

/* ---------- 合作网络 ---------- */
.page-about .ab-net {
  margin: 18px 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-net li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 14px;
  background: var(--sb-panel);
  border-left: 4px solid var(--sb-clay);
}

.page-about .ab-net b {
  flex: 0 0 auto;
  min-width: 40px;
  font-family: var(--sb-font-mono);
  font-size: 24px;
  font-weight: 500;
  line-height: 1;
  color: var(--sb-lime);
}

.page-about .ab-net span {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--sb-sand);
}

/* ---------- 理念与延伸 ---------- */
.page-about .ab-creed {
  margin-top: 6px;
  padding: 26px 20px;
  border: var(--ab-edge);
  box-shadow: var(--sb-shadow);
  background:
    linear-gradient(135deg, rgba(54, 82, 68, 0.62) 0%, rgba(16, 42, 32, 0.94) 62%),
    var(--sb-panel);
}

.page-about .ab-creed__line {
  margin: 0 0 16px;
  font-family: var(--sb-font-head);
  font-weight: 300;
  font-size: clamp(22px, 4.2vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--sb-lime);
}

.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
}

.page-about .ab-links .sb-btn {
  flex: 0 1 auto;
}

.page-about .ab-contact {
  margin-top: 26px;
  padding: 18px 16px;
  border: 1px solid var(--sb-moss);
  background: rgba(16, 42, 32, 0.5);
}

.page-about .ab-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin: 0 0 8px;
  font-size: 13.5px;
  color: var(--sb-sand);
}

.page-about .ab-contact__row a {
  color: var(--sb-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(155, 230, 79, 0.4);
}

.page-about .ab-contact__row a:hover,
.page-about .ab-contact__row a:focus-visible {
  border-bottom-color: var(--sb-lime);
}

.page-about .ab-contact__lab {
  min-width: 68px;
  font-family: var(--sb-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sb-stone);
  align-self: center;
}

.page-about .ab-contact__note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(107, 116, 109, 0.45);
  font-size: 12px;
  line-height: 1.7;
  color: var(--sb-stone);
}

.page-about .ab-top {
  margin: 26px 0 0;
  text-align: right;
}

.page-about .ab-top a {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--sb-moss);
  font-family: var(--sb-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sb-sand);
  text-decoration: none;
}

.page-about .ab-top a:hover,
.page-about .ab-top a:focus-visible {
  border-color: var(--sb-lime);
  color: var(--sb-lime);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__inner {
    padding: 118px 24px 44px;
  }

  .page-about .ab-wrap {
    padding: 0 24px;
  }

  .page-about .ab-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-notes .ab-note {
    padding-left: 12px;
  }

  .page-about .ab-creed {
    padding: 32px 26px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-layout {
    grid-template-columns: 178px minmax(0, 1fr);
    gap: 44px;
    padding: 44px 0 80px;
  }

  .page-about .ab-toc {
    position: sticky;
    top: calc(var(--sb-topbar-h) + 22px);
    align-self: start;
  }

  .page-about .ab-toc__list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 2px solid var(--sb-moss);
  }

  .page-about .ab-toc__list li {
    margin-bottom: 2px;
  }

  .page-about .ab-toc__list a {
    border: none;
    border-left: 2px solid transparent;
    margin-left: -2px;
    padding: 9px 10px 9px 12px;
    white-space: normal;
    font-size: 12.5px;
    color: var(--sb-stone);
  }

  .page-about .ab-toc__list a:hover,
  .page-about .ab-toc__list a:focus-visible {
    border-left-color: var(--sb-lime);
    color: var(--sb-lime);
    background: rgba(155, 230, 79, 0.06);
  }

  .page-about .ab-chapter {
    padding: 44px 0 16px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.78fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .ab-split--rev {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .ab-stat {
    padding: 20px 16px 18px;
  }

  .page-about .ab-creed {
    padding: 38px 34px;
  }

  .page-about .ab-contact {
    padding: 22px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__head::before {
    transition: none;
  }
}
<<<END>>>