.page-about {
  --ab-line: rgba(11, 29, 46, .14);
  --ab-line-dark: rgba(201, 211, 220, .2);
  --ab-soft: rgba(11, 29, 46, .06);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.28;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-eyebrow {
  font-size: .78rem;
  letter-spacing: .24em;
  color: var(--clay);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.page-about .ab-eyebrow--light {
  color: var(--gold-soft);
}

.page-about .ab-h2 {
  font-size: clamp(1.42rem, 4.6vw, 2.15rem);
  color: var(--ink);
  margin-bottom: 16px;
}

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

.page-about .ab-lead {
  font-size: 1rem;
  color: #40505c;
  max-width: 62ch;
}

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

.page-about .ab-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: var(--paper-2);
}

.page-about .ab-figure__cap {
  margin-top: 10px;
  font-size: .82rem;
  color: var(--stone);
  letter-spacing: .02em;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(22px, 5vw, 48px) 0 clamp(34px, 7vw, 78px);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(46, 111, 142, .58), transparent 62%),
    radial-gradient(90% 80% at 4% 4%, rgba(214, 168, 79, .16), transparent 58%),
    linear-gradient(158deg, var(--ink) 0%, var(--night) 58%, #0d2637 100%);
  color: var(--moon);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(201, 211, 220, .07) 0 1px, transparent 1px 76px);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: .82rem;
  color: rgba(201, 211, 220, .72);
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .ab-crumbs .crumbs__item {
  color: inherit;
  text-decoration: none;
}

.page-about .ab-crumbs a.crumbs__item {
  color: var(--gold-soft);
}

.page-about .ab-crumbs .crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(201, 211, 220, .4);
}

.page-about .ab-hero__frame {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  padding: clamp(20px, 4vw, 42px);
  border: 1px solid var(--ab-line-dark);
  border-radius: var(--radius-sm);
  background: rgba(8, 22, 35, .45);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .ab-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: .82rem;
  letter-spacing: .14em;
  color: var(--gold-soft);
  margin-bottom: 14px;
}

.page-about .ab-hero__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(214, 168, 79, .18);
  animation: ab-breathe 3.6s var(--ease) infinite;
}

@keyframes ab-breathe {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .55; transform: scale(.82); }
}

.page-about .ab-hero__title {
  font-size: clamp(1.68rem, 7vw, 3.3rem);
  color: var(--white);
  letter-spacing: .035em;
  margin-bottom: 16px;
}

.page-about .ab-hero__intro {
  font-size: clamp(.94rem, 2.6vw, 1.04rem);
  color: rgba(201, 211, 220, .9);
  max-width: 54ch;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3.4vw, 30px);
}

.page-about .ab-hero__board {
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--ab-line-dark);
}

.page-about .ab-board__label {
  font-size: .74rem;
  letter-spacing: .22em;
  color: rgba(201, 211, 220, .62);
  margin-bottom: 14px;
}

.page-about .ab-board__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-board__item {
  display: grid;
  grid-template-columns: 4.6rem 1fr;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(201, 211, 220, .16);
}

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

.page-about .ab-board__num {
  font-size: clamp(1.32rem, 4.4vw, 1.72rem);
  color: var(--gold);
  line-height: 1.1;
}

.page-about .ab-board__txt {
  font-size: .84rem;
  color: rgba(201, 211, 220, .8);
  line-height: 1.6;
}

/* ---------- 品牌沿革 ---------- */
.page-about .ab-origin {
  padding: clamp(40px, 8vw, 88px) 0;
  background: var(--paper);
}

.page-about .ab-origin__head {
  max-width: 68ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .ab-origin__body {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .ab-origin__text p + p {
  margin-top: 16px;
}

.page-about .ab-origin__text p {
  color: #33434f;
  font-size: .96rem;
}

.page-about .ab-checks {
  list-style: none;
  margin: 22px 0 0;
  padding: 18px 20px;
  background: var(--white);
  border-left: 3px solid var(--moss);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-checks li {
  position: relative;
  padding-left: 18px;
  font-size: .9rem;
  color: #2f4049;
}

.page-about .ab-checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  transform: rotate(45deg);
  background: var(--teal);
}

.page-about .ab-origin__figure {
  align-self: start;
}

/* ---------- 更新节律 ---------- */
.page-about .ab-cadence {
  padding: 0 0 clamp(40px, 8vw, 84px);
  background: var(--paper);
}

.page-about .ab-cadence__panel {
  padding: clamp(22px, 4.4vw, 48px);
  border-radius: var(--radius);
  background:
    radial-gradient(110% 80% at 92% 0%, rgba(46, 111, 142, .5), transparent 60%),
    linear-gradient(165deg, var(--night) 0%, var(--ink) 100%);
  color: var(--moon);
  box-shadow: var(--shadow-panel);
}

.page-about .ab-cadence__top {
  display: grid;
  gap: 16px;
  padding-bottom: clamp(18px, 3vw, 28px);
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-cadence__note {
  font-size: .9rem;
  color: rgba(201, 211, 220, .86);
  border-left: 2px solid var(--gold);
  padding-left: 14px;
}

.page-about .ab-steps {
  list-style: none;
  margin: clamp(20px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-step {
  position: relative;
  padding: 16px 18px 18px;
  border: 1px solid var(--ab-line-dark);
  border-radius: var(--radius-sm);
  background: rgba(11, 29, 46, .38);
}

.page-about .ab-step__no {
  display: inline-block;
  font-size: .78rem;
  color: var(--tide);
  letter-spacing: .14em;
  margin-bottom: 8px;
}

.page-about .ab-step__title {
  font-size: 1rem;
  color: var(--white);
  margin-bottom: 6px;
}

.page-about .ab-step p {
  font-size: .87rem;
  color: rgba(201, 211, 220, .8);
}

.page-about .ab-types {
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .ab-types__label {
  font-size: .76rem;
  letter-spacing: .2em;
  color: rgba(201, 211, 220, .6);
  margin-bottom: 12px;
}

.page-about .ab-types__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-type {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid rgba(224, 138, 110, .55);
  background: rgba(224, 138, 110, .12);
  color: #f0d3c6;
  font-size: .84rem;
}

.page-about .ab-type__no {
  font-size: .7rem;
  color: var(--coral);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: clamp(40px, 8vw, 88px) 0;
  background: linear-gradient(180deg, var(--white) 0%, var(--paper) 100%);
}

.page-about .ab-team__head {
  max-width: 68ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .ab-team__grid {
  display: grid;
  gap: 16px;
}

.page-about .ab-role {
  padding: 20px 20px 22px;
  background: var(--white);
  border: 1px solid var(--paper-2);
  border-top: 3px solid var(--ab-accent, var(--teal));
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  box-shadow: 0 18px 40px -34px rgba(11, 29, 46, .6);
}

.page-about .ab-role--edit { --ab-accent: var(--teal); }
.page-about .ab-role--arch { --ab-accent: var(--moss); }
.page-about .ab-role--care { --ab-accent: var(--clay); }

.page-about .ab-role__tag {
  display: inline-block;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--ab-accent, var(--teal));
  margin-bottom: 10px;
}

.page-about .ab-role__title {
  font-size: 1.02rem;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .ab-role p:last-child {
  font-size: .89rem;
  color: #43535e;
}

.page-about .ab-team__flow {
  display: grid;
  gap: clamp(20px, 3.4vw, 36px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .ab-team__aside {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .ab-details {
  background: var(--paper);
  border: 1px solid var(--paper-2);
  border-radius: var(--radius-sm);
  padding: 0 16px;
}

.page-about .ab-details[open] {
  background: var(--white);
  border-color: rgba(46, 111, 142, .35);
}

.page-about .ab-details__sum {
  cursor: pointer;
  list-style: none;
  position: relative;
  padding: 14px 30px 14px 0;
  font-size: .92rem;
  font-weight: 600;
  color: var(--ink);
}

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

.page-about .ab-details__sum::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--teal);
  transition: transform .24s var(--ease), color .24s var(--ease);
}

.page-about .ab-details[open] .ab-details__sum::after {
  content: "−";
  color: var(--coral-deep);
}

.page-about .ab-details__list {
  margin: 0 0 16px;
  padding-left: 20px;
  display: grid;
  gap: 8px;
  font-size: .87rem;
  color: #40505c;
}

.page-about .ab-details__list li::marker {
  color: var(--gold);
  font-family: var(--font-mono);
}

.page-about .ab-details__text {
  padding: 0 0 16px;
  font-size: .87rem;
  color: #40505c;
}

/* ---------- 版本积累 ---------- */
.page-about .ab-archive {
  padding: clamp(40px, 8vw, 88px) 0;
  background:
    radial-gradient(100% 90% at 100% 0%, rgba(46, 111, 142, .42), transparent 62%),
    linear-gradient(200deg, var(--ink) 0%, #102538 100%);
  color: var(--moon);
}

.page-about .ab-archive__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .ab-archive__lead {
  font-size: .97rem;
  color: rgba(201, 211, 220, .9);
  margin-bottom: 14px;
}

.page-about .ab-archive__body {
  font-size: .9rem;
  color: rgba(201, 211, 220, .72);
}

.page-about .ab-archive__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .ab-archive__code {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--ab-line-dark);
  border-radius: var(--radius-sm);
  background: rgba(8, 22, 35, .5);
  align-self: start;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .ab-code__label {
  font-size: .74rem;
  letter-spacing: .2em;
  color: rgba(201, 211, 220, .6);
  margin-bottom: 16px;
}

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

.page-about .ab-vcode__cell {
  flex: 1 1 0;
  min-width: 0;
  padding: 14px 10px;
  text-align: center;
  border-radius: var(--radius-sm);
  background: linear-gradient(150deg, var(--teal) 0%, var(--tide) 100%);
  color: var(--white);
}

.page-about .ab-vcode__num {
  display: block;
  font-size: clamp(1.5rem, 5vw, 2rem);
  line-height: 1.1;
  letter-spacing: .08em;
}

.page-about .ab-vcode__cap {
  display: block;
  margin-top: 6px;
  font-size: .72rem;
  color: rgba(250, 247, 240, .88);
  letter-spacing: .06em;
}

.page-about .ab-vcode__sep {
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 1.1rem;
}

.page-about .ab-code__note {
  margin-top: 14px;
  font-size: .84rem;
  color: rgba(201, 211, 220, .78);
}

.page-about .ab-code__facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed rgba(201, 211, 220, .18);
  display: grid;
  gap: 8px;
  font-size: .84rem;
  color: rgba(201, 211, 220, .8);
}

.page-about .ab-code__facts .mono {
  color: var(--gold);
  margin-right: 6px;
}

/* ---------- 服务范围 ---------- */
.page-about .ab-coverage {
  padding: clamp(40px, 8vw, 88px) 0;
  background: var(--paper);
}

.page-about .ab-coverage__head {
  max-width: 66ch;
  margin-bottom: clamp(24px, 4vw, 38px);
}

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

.page-about .ab-coverage__panel {
  padding: clamp(20px, 3.4vw, 30px);
  background: var(--white);
  border: 1px solid var(--paper-2);
  border-radius: var(--radius-sm);
}

.page-about .ab-coverage__title {
  font-size: 1.05rem;
  color: var(--ink);
  margin-bottom: 16px;
}

.page-about .ab-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-contact__row {
  display: grid;
  gap: 2px;
  padding: 11px 0;
  border-bottom: 1px solid var(--paper-2);
}

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

.page-about .ab-contact__key {
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--stone);
}

.page-about .ab-contact__val {
  font-size: .95rem;
  color: var(--ink);
  text-decoration: none;
  word-break: break-word;
}

.page-about a.ab-contact__val:hover {
  color: var(--teal);
  text-decoration: underline;
}

.page-about .ab-coverage__note {
  margin-top: 18px;
  padding: 14px 16px;
  background: rgba(95, 122, 99, .1);
  border-left: 3px solid var(--moss);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: .86rem;
  color: #3a4a44;
}

.page-about .ab-coverage__panel .btn {
  margin-top: 20px;
}

.page-about .ab-coverage__figure {
  align-self: start;
}

.page-about .ab-coverage__legal {
  margin-top: clamp(22px, 3.4vw, 32px);
  font-size: .84rem;
  color: var(--stone);
}

.page-about .ab-coverage__legal a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 发展节点 ---------- */
.page-about .ab-road {
  padding: clamp(40px, 8vw, 84px) 0;
  background: var(--paper-2);
}

.page-about .ab-road__head {
  max-width: 64ch;
  margin-bottom: clamp(22px, 3.6vw, 34px);
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
  display: grid;
  gap: 12px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(46, 111, 142, .55), rgba(110, 120, 115, .25));
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 20px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper-2);
  border: 2px solid var(--teal);
  box-sizing: border-box;
  z-index: 1;
}

.page-about .ab-tl__details {
  background: var(--white);
  border: 1px solid rgba(11, 29, 46, .1);
  border-radius: var(--radius-sm);
  padding: 0 16px;
}

.page-about .ab-tl__details[open] {
  border-color: rgba(214, 168, 79, .5);
  box-shadow: 0 16px 40px -34px rgba(11, 29, 46, .7);
}

.page-about .ab-tl__sum {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 15px 26px 15px 0;
  position: relative;
}

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

.page-about .ab-tl__sum::after {
  content: "▾";
  position: absolute;
  right: 0;
  top: 16px;
  font-size: .8rem;
  color: var(--teal);
  transition: transform .22s var(--ease);
}

.page-about .ab-tl__details[open] .ab-tl__sum::after {
  transform: rotate(180deg);
}

.page-about .ab-tl__year {
  font-size: .92rem;
  color: var(--clay);
  letter-spacing: .1em;
}

.page-about .ab-tl__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .ab-tl__text {
  padding: 0 0 16px;
  font-size: .88rem;
  color: #43535e;
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  padding: clamp(38px, 7vw, 78px) 0;
  background: linear-gradient(160deg, var(--ink) 0%, var(--night) 100%);
}

.page-about .ab-cta__panel {
  text-align: left;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--ab-line-dark);
  border-radius: var(--radius);
  background: rgba(8, 22, 35, .4);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .ab-cta__title {
  font-size: clamp(1.24rem, 4.4vw, 1.8rem);
  color: var(--white);
  margin-bottom: 12px;
}

.page-about .ab-cta__text {
  font-size: .92rem;
  color: rgba(201, 211, 220, .84);
  max-width: 58ch;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 760px) {
  .page-about .ab-origin__body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

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

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

  .page-about .ab-team__flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .ab-contact__row {
    grid-template-columns: 6.4rem 1fr;
    align-items: baseline;
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__frame {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-hero__board {
    padding-top: 0;
    padding-left: clamp(18px, 2.4vw, 30px);
    border-top: 0;
    border-left: 1px solid var(--ab-line-dark);
  }

  .page-about .ab-cadence__top {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .9fr);
    align-items: start;
    gap: 28px;
  }

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

  .page-about .ab-archive__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-about .ab-coverage__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .88fr);
    align-items: start;
  }

  .page-about .ab-cta__panel {
    padding-inline: clamp(30px, 4vw, 56px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-hero__dot {
    animation: none;
  }

  .page-about .ab-details__sum::after,
  .page-about .ab-tl__sum::after {
    transition: none;
  }
}
<<<END>>>