.page-about {
  --ab-rail: 104px;
  --ab-gap: clamp(20px, 4vw, 56px);
  --ab-ink-soft: rgba(232, 230, 225, .78);
  --ab-paper-line: rgba(27, 28, 32, .14);
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
  font-family: var(--font-body);
}

.page-about .ab-wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 40px);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--grey);
}
.page-about .ab-crumb a {
  color: var(--grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease-out, border-color .2s ease-out;
}
.page-about .ab-crumb a:hover {
  color: var(--flame);
  border-bottom-color: currentColor;
}
.page-about .ab-crumb [aria-current="page"] {
  color: var(--flame);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(56px, 8vw, 104px) clamp(56px, 7vw, 96px);
  isolation: isolate;
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -8% -12% auto auto;
  width: min(760px, 74vw);
  height: min(560px, 62vw);
  background: radial-gradient(circle at 68% 32%, rgba(255, 95, 31, .34), rgba(255, 95, 31, 0) 66%);
  pointer-events: none;
  z-index: -1;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: auto auto -14% -18%;
  width: min(620px, 68vw);
  height: min(420px, 48vw);
  background: radial-gradient(circle at 30% 60%, rgba(42, 240, 208, .13), rgba(42, 240, 208, 0) 68%);
  pointer-events: none;
  z-index: -1;
}
.page-about .ab-hero .ab-wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--flame);
  background: rgba(255, 95, 31, .1);
  border: 1px solid rgba(255, 95, 31, .32);
  border-radius: var(--pill);
  padding: 6px 14px;
  display: inline-block;
}

.page-about .ab-h1 {
  margin: 0;
  max-width: 17em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .ab-lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 34em;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(32px, 5vw, 52px);
}
@media (min-width: 860px) {
  .page-about .ab-figures { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .ab-figure {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 18px 16px 20px;
  background: linear-gradient(165deg, rgba(255, 95, 31, .09), rgba(26, 28, 34, .82) 52%);
  transition: transform .24s ease-out, border-color .24s ease-out;
}
.page-about .ab-figure:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 95, 31, .5);
}
.page-about .ab-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--white);
  line-height: 1.05;
}
.page-about .ab-figure__num em {
  font-style: normal;
  font-size: .48em;
  margin-left: .22em;
  color: var(--cyan);
}
.page-about .ab-figure__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 区块骨架 ---------- */
.page-about .ab-block {
  position: relative;
  padding-block: clamp(64px, 8.5vw, 132px);
}
.page-about .ab-block--paper {
  background: var(--paper);
  color: var(--paper-ink);
}
.page-about .ab-block--panel {
  background: var(--panel);
}
.page-about .ab-block--final {
  background:
    radial-gradient(ellipse at 82% 8%, rgba(255, 95, 31, .18), rgba(255, 95, 31, 0) 58%),
    var(--ink);
}
.page-about .ab-block--paper .ab-note a { color: var(--ember); }

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}
@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: var(--ab-gap);
  }
}

.page-about .ab-rail {
  position: relative;
}
@media (min-width: 900px) {
  .page-about .ab-rail {
    position: sticky;
    top: 112px;
    align-self: start;
  }
}
.page-about .ab-rail__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 800;
  line-height: .9;
  letter-spacing: -.02em;
  color: var(--line);
  transition: color .26s ease-out;
}
.page-about .ab-block.is-active .ab-rail__num {
  color: var(--flame);
}
.page-about .ab-block--paper .ab-rail__num { color: rgba(27, 28, 32, .22); }
.page-about .ab-block--paper.is-active .ab-rail__num { color: var(--flame); }

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

.page-about .ab-title {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -.02em;
  color: inherit;
}

.page-about .ab-prose {
  max-width: 38em;
  font-size: 17px;
  line-height: 1.85;
}
.page-about .ab-prose p { margin: 0 0 1.1em; }

.page-about .ab-note {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}
.page-about .ab-block--paper .ab-note { color: #5A6068; }
.page-about .ab-note a {
  color: var(--flame);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 95, 31, .45);
  transition: border-color .2s ease-out;
}
.page-about .ab-note a:hover { border-bottom-color: var(--flame); }

/* ---------- 业务线 ---------- */
.page-about .ab-paths {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}
@media (min-width: 1020px) {
  .page-about .ab-paths { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.page-about .ab-path {
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 24px 22px 22px;
  background: linear-gradient(158deg, rgba(255, 95, 31, .13), rgba(26, 28, 34, .9) 48%);
  transition: transform .24s ease-out, border-color .24s ease-out;
}
.page-about .ab-path:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 95, 31, .52);
}
.page-about .ab-path__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--flame);
  border-bottom: 2px solid var(--flame);
  padding-bottom: 6px;
}
.page-about .ab-path h3 {
  margin: 14px 0 14px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}
.page-about .ab-path ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-path li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-ink-soft);
}
.page-about .ab-path li:last-child { margin-bottom: 0; }
.page-about .ab-path li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--cyan);
}

/* ---------- 图片容器 ---------- */
.page-about .ab-media {
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--panel-deep);
}
.page-about .ab-media--wide { margin-top: clamp(30px, 4vw, 48px); }
.page-about .ab-media--tall { margin-top: 0; }
.page-about .ab-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-media figcaption {
  padding: 14px 20px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}
.page-about .ab-block--paper .ab-media {
  border-color: var(--ab-paper-line);
  background: #E3DCD0;
}
.page-about .ab-block--paper .ab-media figcaption { color: #5A6068; }

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-tl {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 34px) 34px;
}
.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 0;
  width: 2px;
  background: var(--ab-paper-line);
}
.page-about .ab-tl:last-child::before { display: none; }
.page-about .ab-tl::after {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--grey);
  transition: border-color .22s ease-out, box-shadow .22s ease-out;
}
.page-about .ab-tl:hover::after,
.page-about .ab-tl:focus-within::after {
  border-color: var(--flame);
  box-shadow: 0 0 0 4px rgba(255, 95, 31, .16);
}
.page-about .ab-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--ember);
  transition: color .22s ease-out;
}
.page-about .ab-tl:hover .ab-tl__year { color: var(--flame); }
.page-about .ab-tl__head {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--paper-ink);
}
.page-about .ab-tl__body {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: #3A3D44;
}

/* ---------- 数据来源 ---------- */
.page-about .ab-duo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(26px, 3.6vw, 40px);
  align-items: start;
}
@media (min-width: 900px) {
  .page-about .ab-duo { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  .page-about .ab-duo--reverse { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
}

.page-about .ab-sources {
  display: grid;
  gap: 12px;
}
.page-about .ab-source {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 20px 20px 18px;
  background: var(--panel-deep);
  transition: border-color .22s ease-out, transform .22s ease-out;
}
.page-about .ab-source:hover {
  border-color: rgba(42, 240, 208, .45);
  transform: translateX(4px);
}
.page-about .ab-source__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
  margin-bottom: 10px;
}
.page-about .ab-source h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--white);
}
.page-about .ab-source p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-ink-soft);
}

.page-about .ab-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(28px, 3.6vw, 42px);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--line-soft);
}
@media (min-width: 720px) {
  .page-about .ab-strip { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .ab-strip__item {
  background: var(--ink);
  padding: 20px 22px 22px;
}
.page-about .ab-strip__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
}
.page-about .ab-strip__num em {
  font-style: normal;
  font-size: .5em;
  margin-left: .16em;
  color: var(--grey);
}
.page-about .ab-strip__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--grey);
}

/* ---------- 团队 ---------- */
.page-about .ab-teamcard {
  border-radius: var(--radius-lg);
  border: 1px solid var(--ab-paper-line);
  background: rgba(255, 255, 255, .55);
  padding: 22px 22px 18px;
}
.page-about .ab-teamcard__key {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ember);
  margin-bottom: 14px;
}
.page-about .ab-teamcard__list { margin: 0; }
.page-about .ab-teamcard__list > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--ab-paper-line);
}
.page-about .ab-teamcard__list > div:last-child { border-bottom: none; }
.page-about .ab-teamcard__list dt {
  font-size: 15px;
  color: #4A4E56;
}
.page-about .ab-teamcard__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-ink);
}

.page-about .ab-block--paper .ab-duo { margin-top: clamp(22px, 3vw, 32px); }
.page-about .ab-block--paper .ab-media--tall { margin-top: 0; }

.page-about .ab-dots {
  position: relative;
  margin-top: clamp(24px, 3.2vw, 36px);
  min-height: 200px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ab-paper-line);
  background-color: #E7E0D4;
  background-image: radial-gradient(rgba(123, 45, 11, .32) 1.5px, transparent 1.6px);
  background-size: 20px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  padding: 28px clamp(22px, 4vw, 44px);
  overflow: hidden;
}
.page-about .ab-dots::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255, 95, 31, .26), rgba(255, 95, 31, 0) 62%);
  pointer-events: none;
}
.page-about .ab-dots__num,
.page-about .ab-dots__cap {
  position: relative;
  z-index: 1;
}
.page-about .ab-dots__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 800;
  line-height: 1;
  color: var(--ember);
  display: flex;
  align-items: baseline;
  gap: .28em;
}
.page-about .ab-dots__num em {
  font-style: normal;
  font-size: .28em;
  color: #4A4E56;
  letter-spacing: .04em;
}
.page-about .ab-dots__cap {
  font-size: 15px;
  line-height: 1.7;
  color: #4A4E56;
}

/* ---------- 合作 ---------- */
.page-about .ab-plans {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}
@media (min-width: 860px) {
  .page-about .ab-plans { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.page-about .ab-plan {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  background: var(--panel);
  transition: transform .24s ease-out, border-color .24s ease-out;
}
.page-about .ab-plan:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 95, 31, .45);
}
.page-about .ab-plan h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  color: var(--white);
}
.page-about .ab-plan p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .ab-capsule {
  display: inline-block;
  padding: 5px 13px;
  border-radius: var(--pill);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .06em;
}
.page-about .ab-capsule--flame {
  color: var(--flame);
  background: rgba(255, 95, 31, .12);
  border: 1px solid rgba(255, 95, 31, .38);
}
.page-about .ab-capsule--cyan {
  color: var(--cyan);
  background: rgba(42, 240, 208, .1);
  border: 1px solid rgba(42, 240, 208, .34);
}

/* ---------- 资质 ---------- */
.page-about .ab-badges {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}
@media (min-width: 760px) {
  .page-about .ab-badges { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.page-about .ab-badges li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--panel-deep);
}
.page-about .ab-badges__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--flame);
  min-width: 76px;
}
.page-about .ab-badges__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

/* ---------- 收束 ---------- */
.page-about .ab-reasons {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}
@media (min-width: 900px) {
  .page-about .ab-reasons { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .ab-reason {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 24px 22px 26px;
  background: linear-gradient(180deg, rgba(26, 28, 34, .95), rgba(21, 23, 29, .82));
}
.page-about .ab-reason__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 56px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--flame);
}
.page-about .ab-reason__num span {
  font-size: .34em;
  margin-left: .24em;
  color: var(--cyan);
}
.page-about .ab-reason h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  color: var(--white);
}
.page-about .ab-reason p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .ab-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 3.6vw, 42px);
}
.page-about .ab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 26px;
  border-radius: var(--pill);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  text-decoration: none;
  transition: transform .2s ease-out, background-color .2s ease-out, border-color .2s ease-out, color .2s ease-out;
}
.page-about .ab-btn--flame {
  background: var(--flame);
  color: #170803;
  box-shadow: var(--shadow-float);
}
.page-about .ab-btn--flame:hover {
  background: var(--flame-soft);
  transform: translateY(-2px);
}
.page-about .ab-btn--ghost {
  color: var(--text);
  border: 1px solid var(--line);
  background: transparent;
}
.page-about .ab-btn--ghost:hover {
  color: var(--flame);
  border-color: var(--flame);
  transform: translateY(-2px);
}
.page-about .ab-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 小屏收紧 ---------- */
@media (max-width: 560px) {
  .page-about { --ab-rail: 100%; }
  .page-about .ab-rail__num {
    font-size: 48px;
    line-height: 1;
  }
  .page-about .ab-figure { padding: 16px 14px 18px; }
  .page-about .ab-path { padding: 20px 18px; }
  .page-about .ab-tl { padding-left: 28px; }
  .page-about .ab-dots { min-height: 170px; }
  .page-about .ab-btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}