.page-about {
  --ab-line: rgba(74, 90, 120, .5);
  --ab-panel: rgba(18, 36, 74, .78);
  --ab-muted: rgba(247, 250, 255, .66);
  color: var(--white);
}

/* ============ 通用节奏 ============ */
.page-about .ab-sec {
  padding: clamp(56px, 9vw, 108px) 0;
  position: relative;
}
.page-about .ab-sec__head {
  max-width: 720px;
  margin-bottom: clamp(28px, 5vw, 52px);
}
.page-about .ab-sec__head h2 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.015em;
  font-size: clamp(1.75rem, 5.4vw, 2.6rem);
  line-height: 1.16;
  margin: 10px 0 14px;
}
.page-about .ab-sec__head .lead {
  color: var(--ab-muted);
  max-width: 640px;
}

/* ============ 首屏 ============ */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 7vw, 84px) 0 clamp(30px, 5vw, 58px);
  background:
    radial-gradient(110% 84% at 6% -12%, rgba(57, 232, 214, .20), transparent 56%),
    radial-gradient(92% 74% at 102% -4%, rgba(246, 166, 35, .16), transparent 62%),
    linear-gradient(180deg, #0d2148 0%, var(--ink-indigo) 54%, #071127 100%);
  border-bottom: 1px solid var(--line-cyan);
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(247, 250, 255, .045) 0 1px, transparent 1px 92px);
  pointer-events: none;
}
.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.4rem, 10vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -.025em;
  margin: clamp(18px, 3.4vw, 30px) 0 0;
  color: var(--white);
}
.page-about .ab-hero__sub {
  display: block;
  margin-top: clamp(12px, 2.2vw, 20px);
  font-size: clamp(.95rem, 2.7vw, 1.22rem);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--cyan);
}
.page-about .ab-hero__body {
  display: grid;
  gap: 18px;
  margin-top: clamp(20px, 3.4vw, 32px);
}
.page-about .ab-hero__lead {
  max-width: 620px;
  color: rgba(247, 250, 255, .82);
}
.page-about .ab-hero__aside {
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  line-height: 1.9;
}

.page-about .ab-stats {
  list-style: none;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-cyan);
  border-top: 1px solid var(--line-cyan);
  border-bottom: 1px solid var(--line-cyan);
}
.page-about .ab-stat {
  background: rgba(8, 20, 44, .82);
  padding: 16px 14px 18px;
  min-width: 0;
}
.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 5vw, 2rem);
  line-height: 1.1;
  color: var(--amber);
  margin-bottom: 8px;
}
.page-about .ab-stat__key {
  display: block;
  font-size: .78rem;
  line-height: 1.6;
  color: var(--ab-muted);
}

/* ============ 品牌起点 ============ */
.page-about .ab-origin {
  background: linear-gradient(180deg, #071127 0%, var(--ink-indigo) 40%, #0a1730 100%);
}
.page-about .ab-origin__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}
.page-about .ab-origin__text h2 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.015em;
  font-size: clamp(1.75rem, 5.4vw, 2.6rem);
  line-height: 1.16;
  margin: 10px 0 18px;
}
.page-about .ab-origin__text p {
  color: rgba(247, 250, 255, .78);
  max-width: 60ch;
}
.page-about .ab-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-points__item {
  border-left: 2px solid var(--cyan);
  padding: 2px 0 2px 16px;
}
.page-about .ab-points__item strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--white);
  margin-bottom: 4px;
}
.page-about .ab-points__item span {
  display: block;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--ab-muted);
}
.page-about .ab-origin__media {
  margin: 0;
  border: 1px solid rgba(10, 14, 26, .16);
  box-shadow: 0 18px 40px rgba(3, 8, 20, .5);
}

/* ============ 时间轴 ============ */
.page-about .ab-tl {
  background: #0a1730;
}
.page-about .ab-tl__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .ab-tl__list::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(57, 232, 214, .35) 42%, rgba(246, 166, 35, .55) 100%);
}
.page-about .ab-tl__item {
  position: relative;
  padding-left: 44px;
  margin-bottom: 20px;
}
.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 26px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #0a1730;
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(57, 232, 214, .12);
}
.page-about .ab-tl__card {
  border: 1px solid var(--line);
  border-left: 3px solid rgba(57, 232, 214, .5);
  padding: 20px 18px 22px;
  background: var(--ab-panel);
}
.page-about .ab-tl__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .18em;
  color: var(--amber);
  border: 1px solid rgba(246, 166, 35, .45);
  padding: 2px 8px;
  margin-bottom: 12px;
}
.page-about .ab-tl__card .card__title {
  font-family: var(--font-head);
  font-size: clamp(1.1rem, 3.6vw, 1.35rem);
  font-weight: 800;
  color: var(--white);
}
.page-about .ab-tl__card .card__meta {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--cyan);
  margin: 6px 0 10px;
}
.page-about .ab-tl__card p {
  font-size: .94rem;
  line-height: 1.75;
  color: rgba(247, 250, 255, .8);
}
.page-about .ab-tl__more {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(57, 232, 214, .3);
  font-size: .86rem;
  color: var(--ab-muted);
}
.page-about .ab-tl__plate {
  list-style: none;
  position: relative;
  padding-left: 44px;
  margin: 6px 0 26px;
}
.page-about .ab-tl__media {
  margin: 0;
  border: 1px solid var(--line);
}

/* ============ 团队 ============ */
.page-about .ab-crew {
  background: linear-gradient(180deg, #0a1730 0%, var(--ink-indigo) 100%);
}
.page-about .ab-crew__bar {
  margin-bottom: 20px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.page-about .ab-crew__filter {
  display: flex;
  gap: 8px;
  min-width: max-content;
}
.page-about .ab-crew__filter .filterbar__btn {
  font-family: var(--font-body);
  font-size: .84rem;
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ab-muted);
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}
.page-about .ab-crew__filter .filterbar__btn:hover {
  color: var(--white);
  border-color: var(--line-cyan);
}
.page-about .ab-crew__filter .filterbar__btn.is-active,
.page-about .ab-crew__filter .filterbar__btn[aria-pressed="true"] {
  color: var(--ink-indigo);
  background: var(--cyan);
  border-color: var(--cyan);
}
.page-about .ab-crew__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .ab-crew__card {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--ab-panel);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(57, 232, 214, .55);
}
.page-about .ab-crew__card:nth-child(even) {
  border-top-color: rgba(246, 166, 35, .6);
}
.page-about .ab-crew__no {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--slate);
}
.page-about .ab-crew__role {
  font-family: var(--font-head);
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--white);
  margin: 10px 0 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}
.page-about .ab-crew__count {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--amber);
  letter-spacing: .06em;
}
.page-about .ab-crew__card p {
  font-size: .9rem;
  line-height: 1.72;
  color: var(--ab-muted);
}
.page-about [data-filter-item][hidden] {
  display: none;
}

.page-about .ab-flow {
  margin-top: clamp(34px, 6vw, 60px);
  padding-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--line-cyan);
}
.page-about .ab-flow__head {
  font-family: var(--font-head);
  font-size: clamp(1.15rem, 3.6vw, 1.5rem);
  font-weight: 800;
  color: var(--white);
  margin-bottom: 20px;
}
.page-about .ab-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.page-about .ab-flow__step {
  padding: 16px 16px 18px;
  background: rgba(8, 20, 44, .68);
  border-left: 2px solid var(--amber);
}
.page-about .ab-flow__idx {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--amber);
}
.page-about .ab-flow__title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 800;
  color: var(--white);
  margin: 8px 0 6px;
}
.page-about .ab-flow__text {
  font-size: .88rem;
  line-height: 1.7;
  color: var(--ab-muted);
}

/* ============ 服务覆盖 ============ */
.page-about .ab-cover {
  background: #0a1730;
}
.page-about .ab-cover__grid {
  display: grid;
  gap: clamp(26px, 5vw, 44px);
}
.page-about .ab-cover__text h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.7rem, 5.2vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -.015em;
  margin: 10px 0 16px;
}
.page-about .ab-cover__text > p {
  color: rgba(247, 250, 255, .78);
  max-width: 56ch;
}
.page-about .ab-cover__facts {
  margin: 24px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-cyan);
  border-top: 1px solid var(--line-cyan);
}
.page-about .ab-fact {
  background: rgba(8, 20, 44, .8);
  padding: 12px 14px;
}
.page-about .ab-fact__k {
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--slate);
  margin-bottom: 4px;
}
.page-about .ab-fact__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .92rem;
  color: var(--white);
  word-break: break-word;
}

.page-about .ab-map {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background:
    radial-gradient(80% 70% at 50% 40%, rgba(57, 232, 214, .12), transparent 70%),
    #061021;
  overflow: hidden;
}
.page-about .ab-map__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: .72;
}
.page-about .ab-map__pin {
  position: absolute;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(57, 232, 214, .18);
  cursor: pointer;
  outline: none;
}
.page-about .ab-map__pin:nth-of-type(even) {
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(246, 166, 35, .18);
}
.page-about .ab-map__label {
  position: absolute;
  left: 50%;
  bottom: 130%;
  transform: translate(-50%, 6px);
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  padding: 4px 8px;
  background: var(--paper);
  color: var(--ink);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.page-about .ab-map__pin:hover .ab-map__label,
.page-about .ab-map__pin:focus-visible .ab-map__label {
  opacity: 1;
  transform: translate(-50%, 0);
}
.page-about .ab-pin--1 { left: 62%; top: 33%; }
.page-about .ab-pin--2 { left: 52%; top: 22%; }
.page-about .ab-pin--3 { left: 72%; top: 45%; }
.page-about .ab-pin--4 { left: 58%; top: 68%; }
.page-about .ab-pin--5 { left: 34%; top: 60%; }
.page-about .ab-pin--6 { left: 78%; top: 17%; }
.page-about .ab-pin--7 { left: 16%; top: 78%; }
.page-about .ab-map__cap {
  margin: 0;
  padding: 12px 14px;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--ab-muted);
  border-top: 1px solid var(--line-cyan);
  background: rgba(6, 16, 33, .9);
}

/* ============ 更新与归档 ============ */
.page-about .ab-update {
  background: linear-gradient(180deg, #0a1730 0%, #0d1d40 55%, #0a1730 100%);
}
.page-about .ab-update__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .ab-update__card {
  padding: 22px 20px 24px;
  background: var(--ab-panel);
  border: 1px solid var(--line);
}
.page-about .ab-update__card--wide {
  background: linear-gradient(140deg, rgba(57, 232, 214, .14), rgba(18, 36, 74, .86) 62%);
  border-color: rgba(57, 232, 214, .38);
}
.page-about .ab-update__num {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 4.4vw, 1.7rem);
  color: var(--amber);
  margin: 12px 0 6px;
}
.page-about .ab-update__card h3 {
  font-family: var(--font-head);
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 8px;
}
.page-about .ab-update__card p {
  font-size: .9rem;
  line-height: 1.72;
  color: var(--ab-muted);
}

/* ============ 认可与合作 ============ */
.page-about .ab-honor {
  background: #0a1730;
}
.page-about .ab-honor__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-about .ab-honor__card {
  padding: 22px 20px 24px;
  box-shadow: 0 16px 34px rgba(3, 8, 20, .42);
}
.page-about .ab-honor__card .card__title {
  font-family: var(--font-head);
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--ink);
  margin-bottom: 10px;
}
.page-about .ab-honor__card p {
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(10, 14, 26, .78);
}

/* ============ 结尾 ============ */
.page-about .ab-cta {
  padding: clamp(48px, 8vw, 96px) 0;
  background:
    radial-gradient(90% 120% at 88% 10%, rgba(246, 166, 35, .22), transparent 62%),
    linear-gradient(160deg, #12244a 0%, #0b1b3a 60%, #071127 100%);
  border-top: 1px solid var(--line-cyan);
}
.page-about .ab-cta__inner {
  max-width: 720px;
}
.page-about .ab-cta__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.8rem, 6vw, 2.8rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--white);
  margin-bottom: 14px;
}
.page-about .ab-cta__text {
  color: rgba(247, 250, 255, .78);
  max-width: 54ch;
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
.page-about .ab-cta__actions .btn {
  text-decoration: none;
}

/* ============ 桌面布局 ============ */
@media (min-width: 700px) {
  .page-about .ab-hero__body {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 32px;
  }
  .page-about .ab-hero__aside {
    writing-mode: vertical-rl;
    justify-self: end;
    line-height: 1.2;
    letter-spacing: .2em;
    padding-top: 6px;
  }
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .ab-crew__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-flow__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .ab-cover__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-update__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-honor__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .ab-hero {
    padding-top: clamp(56px, 6vw, 104px);
  }
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
  .page-about .ab-origin__media {
    position: sticky;
    top: 96px;
  }
  .page-about .ab-tl__list {
    padding-left: 42px;
  }
  .page-about .ab-tl__list::before {
    left: 57px;
  }
  .page-about .ab-tl__item {
    padding-left: 0;
  }
  .page-about .ab-tl__item::before {
    left: 50px;
  }
  .page-about .ab-tl__plate {
    padding-left: 0;
  }
  .page-about .ab-tl__media {
    margin-left: 92px;
    max-width: 760px;
  }
  .page-about .ab-crew__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-flow__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-cover__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }
  .page-about .ab-update__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-update__card--wide {
    grid-column: span 2;
  }
  .page-about .ab-honor__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 1024px) {
  .page-about .ab-tl__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height .28s ease, opacity .28s ease, margin-top .28s ease, padding-top .28s ease;
  }
  .page-about .ab-tl__item:hover .ab-tl__more,
  .page-about .ab-tl__item:focus-within .ab-tl__more {
    max-height: 200px;
    opacity: 1;
    margin-top: 10px;
    padding-top: 10px;
    border-top-color: rgba(57, 232, 214, .3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__more,
  .page-about .ab-map__label,
  .page-about .ab-crew__filter .filterbar__btn {
    transition: none;
  }
}