.page-about {
  --ab-gap: clamp(18px, 3vw, 30px);
}

.page-about .ab-crumb-row {
  padding-top: clamp(14px, 2.4vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 5vw, 54px) 0 clamp(32px, 6vw, 68px);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(54, 242, 206, 0.14), transparent 58%),
    linear-gradient(180deg, rgba(11, 46, 70, 0.5), rgba(6, 26, 42, 0));
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -40%;
  right: -14%;
  width: min(680px, 78%);
  height: 190%;
  background: linear-gradient(160deg, rgba(54, 242, 206, 0.16), rgba(11, 46, 70, 0.72) 58%, rgba(6, 26, 42, 0) 92%);
  border-left: 1px solid rgba(54, 242, 206, 0.34);
  transform: skewX(-13deg);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.4vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--mist);
  margin: 0.4em 0 0.55em;
  max-width: 18ch;
}

.page-about .ab-brief {
  position: relative;
  padding: clamp(16px, 2.4vw, 22px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 46, 70, 0.94), rgba(4, 19, 32, 0.94));
  box-shadow: var(--shadow-panel);
}

.page-about .ab-brief::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  bottom: -1px;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--amber) 62%, var(--rose));
}

.page-about .ab-brief__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .ab-brief__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(120, 147, 163, 0.28);
}

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

.page-about .ab-brief__k {
  font-size: 0.84rem;
  color: var(--body-soft);
}

.page-about .ab-brief__v {
  font-family: var(--font-mono);
  font-size: 0.98rem;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .ab-brief__v--amber {
  color: var(--amber);
}

/* ---------- 画板骨架 ---------- */
.page-about .ab-shell {
  display: grid;
  gap: clamp(20px, 4vw, 38px);
  padding-block: clamp(26px, 5vw, 56px);
}

.page-about .ab-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  color: var(--slate);
}

.page-about .ab-spy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .ab-spy .spy-nav__link {
  display: block;
  padding: 9px 12px;
  font-size: 0.86rem;
  line-height: 1.4;
  color: var(--body-soft);
  text-decoration: none;
  border-left: 2px solid rgba(120, 147, 163, 0.3);
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .ab-spy .spy-nav__link:hover,
.page-about .ab-spy .spy-nav__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .ab-spy .spy-nav__link[aria-current="true"] {
  background: var(--cyan);
  color: var(--ink-900);
  border-left-color: var(--amber);
  font-weight: 700;
}

.page-about .ab-rail__stamp {
  display: none;
  margin-top: 22px;
  padding: 12px 14px 12px 16px;
  border: 1px solid rgba(255, 176, 58, 0.4);
  background: rgba(255, 176, 58, 0.08);
}

.page-about .ab-rail__stamp-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--amber);
}

.page-about .ab-rail__stamp-text {
  display: block;
  margin-top: 8px;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--body-soft);
}

.page-about .ab-main {
  min-width: 0;
}

.page-about .ab-sheet {
  position: relative;
  margin-bottom: var(--ab-gap);
  padding: clamp(20px, 3.6vw, 38px);
  border: 1px solid rgba(120, 147, 163, 0.34);
  background: linear-gradient(180deg, rgba(11, 46, 70, 0.88), rgba(6, 26, 42, 0.9));
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .ab-sheet:last-of-type {
  margin-bottom: 0;
}

.page-about .ab-sheet--paper {
  background: var(--paper);
  color: var(--brown);
  border-color: rgba(34, 26, 22, 0.42);
  border-width: 1px 2px 2px 1px;
  box-shadow: 9px 9px 0 -1px rgba(4, 19, 32, 0.6), 0 26px 44px -34px rgba(0, 0, 0, 0.95);
}

.page-about .ab-sheet__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 13px;
  margin-bottom: 18px;
  border-bottom: 1px solid rgba(120, 147, 163, 0.26);
}

.page-about .ab-sheet--paper .ab-sheet__head {
  border-bottom-color: rgba(34, 26, 22, 0.24);
}

.page-about .ab-num {
  flex: none;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid var(--line);
}

.page-about .ab-sheet--paper .ab-num {
  color: var(--brown);
  border-color: rgba(34, 26, 22, 0.5);
  background: rgba(255, 176, 58, 0.34);
}

.page-about .ab-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.32rem, 3.2vw, 2rem);
  line-height: 1.16;
  letter-spacing: 0.005em;
}

.page-about .ab-sheet--paper .ab-h2,
.page-about .ab-h2--light {
  color: var(--brown);
}

.page-about .ab-h2--light {
  color: var(--mist);
}

.page-about .ab-sheet--paper .prose p,
.page-about .ab-sheet--paper .prose li {
  color: #3f3128;
}

.page-about .ab-lede-s {
  margin: 0 0 clamp(16px, 2.6vw, 22px);
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--body-soft);
  max-width: 62ch;
}

.page-about .ab-lede-s--dark {
  color: #4a3a2e;
}

/* ---------- 缘起 ---------- */
.page-about .ab-origin {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

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

.page-about .ab-chan {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-chan__item {
  border: 1px solid rgba(34, 26, 22, 0.28);
  background: rgba(255, 255, 255, 0.34);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-chan__item:hover,
.page-about .ab-chan__item:focus-within {
  border-color: var(--ink-800);
  background: rgba(255, 255, 255, 0.66);
  transform: translateY(-2px);
}

.page-about .ab-chan__link {
  display: block;
  padding: 13px 15px;
  text-decoration: none;
  color: inherit;
}

.page-about .ab-chan__name {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.04rem;
  letter-spacing: 0.02em;
  color: var(--brown);
  margin-bottom: 6px;
}

.page-about .ab-chan__arrow {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--ink-700);
}

.page-about .ab-chan__desc {
  display: block;
  font-size: 0.88rem;
  line-height: 1.65;
  color: #4a3a2e;
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  display: grid;
  gap: 18px;
}

.page-about .ab-tl__years {
  display: flex;
  flex-direction: row;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .ab-year {
  flex: none;
  min-width: 148px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
  border: 1px solid rgba(120, 147, 163, 0.36);
  border-radius: var(--radius);
  background: rgba(4, 19, 32, 0.5);
  color: var(--mist);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-year:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .ab-year[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.page-about .ab-year__num {
  font-family: var(--font-mono);
  font-size: 1.18rem;
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.page-about .ab-year__cap {
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  opacity: 0.82;
}

.page-about .ab-tl__panel {
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

.page-about .ab-tl__panel + .ab-tl__panel {
  margin-top: 18px;
}

.page-about .ab-tl__panel-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan-soft);
}

.page-about .ab-tl__panel p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--body-soft);
}

/* ---------- 团队 ---------- */
.page-about .ab-tree {
  margin-top: clamp(6px, 1.4vw, 10px);
}

.page-about .ab-tree__root {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--brown);
  border: 1px solid rgba(34, 26, 22, 0.6);
}

.page-about .ab-tree__root-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.04rem;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .ab-tree__root-num {
  font-family: var(--font-mono);
  font-size: 0.94rem;
  color: var(--amber);
}

.page-about .ab-branches {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.page-about .ab-branch {
  padding: 14px 14px 16px;
  background: rgba(255, 255, 255, 0.42);
  border: 1px solid rgba(34, 26, 22, 0.28);
  border-top: 3px solid var(--ink-800);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-branch:hover {
  background: #fff9ef;
  border-color: var(--ink-800);
}

.page-about .ab-branch--amber {
  border-top-color: var(--amber);
}

.page-about .ab-branch--rose {
  border-top-color: var(--rose);
}

.page-about .ab-branch__role {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--brown);
}

.page-about .ab-branch__count {
  margin: 2px 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: #7a6353;
}

.page-about .ab-branch__desc {
  margin: 9px 0 10px;
  font-size: 0.88rem;
  line-height: 1.66;
  color: #3f3128;
}

.page-about .ab-branch__list {
  margin: 0;
  padding-left: 1.05em;
  font-size: 0.83rem;
  line-height: 1.72;
  color: #4a3a2e;
}

.page-about .ab-note {
  margin: 16px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--amber);
  background: rgba(255, 176, 58, 0.18);
  font-size: 0.89rem;
  line-height: 1.72;
  color: #3f3128;
}

/* ---------- 流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid rgba(120, 147, 163, 0.26);
}

.page-about .ab-step:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .ab-step__num {
  height: fit-content;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--cyan);
  white-space: nowrap;
}

.page-about .ab-step__title {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .ab-step__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--body-soft);
}

.page-about .ab-flow__media {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

/* ---------- 合作 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 10px;
  margin: 0 0 clamp(16px, 2.6vw, 22px);
}

.page-about .ab-pstat {
  padding: 14px 16px;
  border: 1px solid rgba(34, 26, 22, 0.3);
  background: rgba(255, 255, 255, 0.46);
}

.page-about .ab-pstat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  line-height: 1;
  color: var(--ink-800);
}

.page-about .ab-pstat__num--amber {
  color: #a8600a;
}

.page-about .ab-pstat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: #4a3a2e;
}

.page-about .ab-coop {
  display: grid;
  gap: 12px;
}

.page-about .ab-coop__item {
  padding: 14px;
  border: 1px dashed rgba(34, 26, 22, 0.42);
  transition: border-color 0.2s var(--ease), border-style 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .ab-coop__item:hover {
  border-style: solid;
  border-color: var(--ink-800);
  background: rgba(255, 255, 255, 0.6);
}

.page-about .ab-coop__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--brown);
}

.page-about .ab-coop__desc {
  margin: 0 0 8px;
  font-size: 0.87rem;
  line-height: 1.68;
  color: #4a3a2e;
}

.page-about .ab-coop__fit {
  margin: 0;
  padding-top: 8px;
  border-top: 1px solid rgba(34, 26, 22, 0.16);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: #7a6353;
}

.page-about .ab-tagwall {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 3vw, 24px) 0 0;
  padding: 0;
}

.page-about .ab-sheet--paper .tag {
  background: rgba(34, 26, 22, 0.07);
  color: #3f3128;
  border-color: rgba(34, 26, 22, 0.34);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-sheet--paper .tag:hover {
  background: var(--ink-800);
  color: var(--paper);
  border-color: var(--ink-800);
}

/* ---------- 承诺 ---------- */
.page-about .ab-promise {
  position: relative;
  overflow: hidden;
  margin-top: clamp(6px, 1.6vw, 14px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-850);
}

.page-about .ab-promise__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  filter: saturate(0.85);
}

.page-about .ab-promise__in {
  position: relative;
  padding: clamp(28px, 5vw, 58px) 0;
}

.page-about .ab-promise__text {
  margin: 0;
  max-width: 60ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--body-soft);
}

.page-about .ab-metrics {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .ab-metrics__item {
  padding: 12px 14px;
  border: 1px solid rgba(54, 242, 206, 0.22);
  background: rgba(4, 19, 32, 0.68);
}

.page-about .ab-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.32rem, 2.8vw, 1.8rem);
  line-height: 1.1;
  color: var(--amber);
}

.page-about .ab-metrics__label {
  display: block;
  margin-top: 5px;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--body-soft);
}

.page-about .ab-cta {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  padding: 0;
}

.page-about .ab-cta__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 13px 16px;
  text-decoration: none;
  color: var(--mist);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.03em;
  font-size: 0.98rem;
  border: 1px solid rgba(54, 242, 206, 0.32);
  background: rgba(4, 19, 32, 0.5);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-cta__link:hover,
.page-about .ab-cta__link:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
  transform: translateY(-2px);
}

.page-about .ab-cta__arrow {
  font-family: var(--font-mono);
  font-size: 0.92rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-chan,
  .page-about .ab-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-cta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-origin {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
  .page-about .ab-chan {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-branches {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .ab-tl {
    grid-template-columns: minmax(160px, 0.72fr) minmax(0, 1.28fr);
    gap: 26px;
    align-items: start;
  }
  .page-about .ab-tl__years {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .ab-year {
    min-width: 0;
    width: 100%;
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
  }
  .page-about .ab-year__num {
    font-size: 1.06rem;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(258px, 0.86fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-about .ab-shell {
    grid-template-columns: 212px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .ab-rail {
    position: sticky;
    top: 96px;
  }
  .page-about .ab-spy {
    flex-direction: column;
  }
  .page-about .ab-spy .spy-nav__link {
    border-bottom: 0;
    border-left: 2px solid rgba(120, 147, 163, 0.3);
  }
  .page-about .ab-rail__stamp {
    display: block;
  }
  .page-about .ab-sheet--shift {
    margin-left: clamp(0px, 2vw, 22px);
  }
  .page-about .ab-sheet--shift-r {
    margin-right: clamp(0px, 2vw, 22px);
  }
}

@media (min-width: 1040px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-cta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-step {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 18px;
  }
}
<<<END>>>