.page-about {
  --ab-line: rgba(154, 169, 188, .26);
  --ab-soft: rgba(154, 169, 188, .11);
  --ab-read: rgba(243, 246, 250, .82);
  display: block;
  color: var(--white);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3vw, 34px) 0 clamp(30px, 5vw, 64px);
  background-color: var(--deep);
  background-image:
    radial-gradient(112% 92% at 2% 108%, rgba(34, 224, 214, .17), transparent 58%),
    radial-gradient(92% 84% at 98% -12%, rgba(123, 77, 255, .27), transparent 62%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--ab-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0 16.6%, var(--violet) 16.6% 33.2%, #2BB3AB 33.2% 49.8%, var(--cyan) 49.8% 66.4%, var(--violet) 66.4% 83%, var(--green) 83% 100%);
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 54px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.015em;
  max-width: 17em;
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: clamp(16px, 1.9vw, 17.5px);
  line-height: 1.86;
  color: var(--ab-read);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 目录 */
.page-about .ab-index {
  border: 2px solid var(--steel);
  background-color: rgba(18, 57, 94, .36);
  box-shadow: var(--hard);
  padding: 18px 18px 10px;
}

.page-about .ab-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-index__list li + li {
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-index__list a {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  grid-template-areas:
    "n t"
    "n x";
  gap: 2px 8px;
  padding: 12px 4px;
  text-decoration: none;
  color: inherit;
  border-left: 2px solid transparent;
  transition: background-color .22s ease, border-color .22s ease;
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  background-color: rgba(208, 17, 43, .14);
  border-left-color: var(--red);
}

.page-about .ab-index__n {
  grid-area: n;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--cyan);
}

.page-about .ab-index__t {
  grid-area: t;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .ab-index__x {
  grid-area: x;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--silver);
}

/* ---------- 规模数字条 ---------- */
.page-about .ab-stats {
  padding: clamp(18px, 3vw, 28px) 0;
  background-color: var(--ink);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 12px;
  border-left: 3px solid var(--silver);
}

.page-about .ab-stat:nth-child(1) { border-left-color: var(--amber); }
.page-about .ab-stat:nth-child(2) { border-left-color: var(--cyan); }
.page-about .ab-stat:nth-child(3) { border-left-color: var(--violet); }
.page-about .ab-stat:nth-child(4) { border-left-color: var(--green); }

.page-about .ab-stat .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1;
  color: var(--white);
}

.page-about .ab-stat__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-block {
  padding-top: clamp(34px, 5.4vw, 68px);
}

.page-about .section-head {
  max-width: 46em;
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.18;
  letter-spacing: -.01em;
  margin: 8px 0 10px;
}

.page-about .section-head p {
  margin: 0;
  font-size: 16px;
  line-height: 1.84;
  color: var(--ab-read);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin-top: clamp(20px, 3.4vw, 38px);
  padding: clamp(20px, 3.4vw, 40px) 0 clamp(8px, 1.6vw, 16px);
  background-color: var(--deep);
  overflow: hidden;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(43deg,
    transparent 49.65%,
    rgba(34, 224, 214, .38) 49.65%,
    rgba(34, 224, 214, .38) 50.35%,
    transparent 50.35%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  mix-blend-mode: screen;
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-tl {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-about .ab-tl__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-bottom: clamp(14px, 2.2vw, 20px);
  border-bottom: 1px solid var(--ab-line);
}

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

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.8vw, 34px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: .02em;
}

.page-about .ab-tl__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.3;
  letter-spacing: -.005em;
}

.page-about .ab-tl__ver {
  display: inline-block;
  margin-right: 10px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--deep);
  background-color: var(--cyan);
  vertical-align: 3px;
}

.page-about .ab-tl__item:nth-child(2) .ab-tl__ver { background-color: var(--violet); color: var(--white); }
.page-about .ab-tl__item:nth-child(3) .ab-tl__ver { background-color: #2BB3AB; }
.page-about .ab-tl__item:nth-child(4) .ab-tl__ver { background-color: var(--violet); color: var(--white); }
.page-about .ab-tl__item:nth-child(5) .ab-tl__ver { background-color: var(--green); }
.page-about .ab-tl__item:nth-child(6) .ab-tl__ver { background-color: var(--amber); }

.page-about .ab-tl__text {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ab-read);
}

.page-about .ab-tl__more {
  margin-top: 10px;
  border-left: 2px solid var(--steel);
}

.page-about .ab-tl__more summary {
  list-style: none;
  cursor: pointer;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--cyan);
}

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

.page-about .ab-tl__more summary::before {
  content: "+ ";
}

.page-about .ab-tl__more[open] summary::before {
  content: "– ";
}

.page-about .ab-tl__more p {
  margin: 0;
  padding: 0 10px 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 246, 250, .74);
}

/* ---------- 六个分区连续画布 ---------- */
.page-about .ab-zones {
  padding-top: clamp(38px, 5.6vw, 72px);
}

.page-about .ab-zones .section-head {
  padding-bottom: clamp(20px, 3vw, 34px);
}

.page-about .ab-zone {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--ab-line);
  background-color: var(--deep);
  transition: background-color .28s ease;
}

.page-about .ab-zone:last-child {
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-zone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background-color: var(--z-accent, var(--silver));
}

.page-about .ab-zone--z01 {
  --z-accent: var(--cyan);
  background-image: radial-gradient(88% 130% at -4% 50%, rgba(34, 224, 214, .15), transparent 62%);
}

.page-about .ab-zone--z02 {
  --z-accent: var(--violet);
  background-image: radial-gradient(88% 130% at -4% 50%, rgba(123, 77, 255, .2), transparent 62%);
}

.page-about .ab-zone--z03 {
  --z-accent: #2BB3AB;
  background-color: var(--teal);
  background-image: radial-gradient(88% 130% at -4% 50%, rgba(34, 224, 214, .14), transparent 62%);
}

.page-about .ab-zone--z04 {
  --z-accent: var(--cyan);
  background-image: radial-gradient(88% 130% at -4% 50%, rgba(34, 224, 214, .12), transparent 62%);
}

.page-about .ab-zone--z05 {
  --z-accent: var(--violet);
  background-image: radial-gradient(88% 130% at -4% 50%, rgba(123, 77, 255, .18), transparent 62%);
}

.page-about .ab-zone--z06 {
  --z-accent: var(--green);
  background-image: radial-gradient(88% 130% at -4% 50%, rgba(46, 212, 122, .16), transparent 62%);
}

.page-about .ab-zone:hover {
  background-color: rgba(18, 57, 94, .45);
}

.page-about .ab-zone__mark {
  position: absolute;
  right: -.03em;
  bottom: -.24em;
  z-index: 0;
  font-family: var(--font-mono);
  font-size: clamp(88px, 21vw, 200px);
  font-weight: 700;
  line-height: 1;
  color: var(--z-accent, var(--silver));
  opacity: .1;
  pointer-events: none;
  user-select: none;
  transition: opacity .28s ease;
}

.page-about .ab-zone:hover .ab-zone__mark {
  opacity: .19;
}

.page-about .ab-zone__inner {
  position: relative;
  z-index: 1;
  padding: clamp(24px, 4vw, 46px) 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-zone__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
}

.page-about .ab-zone__code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--z-accent, var(--silver));
  border: 1px solid currentColor;
  padding: 2px 8px;
}

.page-about .ab-zone__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.1;
  letter-spacing: -.01em;
}

.page-about .ab-zone__text {
  margin: 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.86;
  color: var(--ab-read);
}

.page-about .ab-zone__facts {
  margin: 4px 0 0;
  max-width: 42em;
}

.page-about .ab-zone__link {
  justify-self: start;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--z-accent, var(--cyan));
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.page-about .ab-zone__link:hover,
.page-about .ab-zone__link:focus-visible {
  color: var(--white);
}

/* ---------- 内容与规则维护 ---------- */
.page-about .ab-ops {
  padding-bottom: clamp(38px, 5.6vw, 72px);
}

.page-about .ab-ops__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(20px, 3vw, 30px);
  background-color: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-role {
  background-color: var(--deep);
  padding: clamp(16px, 2.4vw, 22px);
}

.page-about .ab-role h3 {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ab-read);
}

.page-about .ab-ops__facts {
  margin: clamp(22px, 3.2vw, 32px) 0 0;
}

.page-about .ab-ops__media {
  margin: 0;
  border: 2px solid var(--steel);
  box-shadow: var(--hard);
  background-color: var(--ink);
}

.page-about .ab-ops__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .ab-ops__media figcaption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--silver);
  border-top: 1px solid var(--ab-line);
}

/* ---------- 入口固定位置 ---------- */
.page-about .ab-entry {
  padding-bottom: clamp(38px, 5.6vw, 72px);
}

.page-about .ab-entry__list {
  list-style: none;
  margin: clamp(20px, 3.2vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-entry__item {
  background-color: var(--deep);
  background-image: linear-gradient(96deg, rgba(208, 17, 43, .14), transparent 52%);
  padding: clamp(18px, 2.8vw, 28px);
  border-left: 3px solid var(--red);
}

.page-about .ab-entry__idx {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--red);
}

.page-about .ab-entry__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.24;
}

.page-about .ab-entry__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.84;
  color: var(--ab-read);
}

.page-about .ab-entry__check {
  margin-top: clamp(24px, 3.4vw, 38px);
  padding: clamp(20px, 3vw, 30px);
  border: 2px solid var(--steel);
  background-color: rgba(18, 57, 94, .34);
  box-shadow: var(--hard);
}

.page-about .ab-entry__check h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--amber);
}

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

.page-about .ab-entry__points li {
  position: relative;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ab-read);
}

.page-about .ab-entry__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 8px;
  background-color: var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .ab-awards {
  padding-bottom: clamp(38px, 5.6vw, 72px);
}

.page-about .ab-awards__media {
  margin: 0 0 clamp(24px, 3.6vw, 40px);
  border: 1px solid var(--ab-line);
  background-color: var(--ink);
  overflow: hidden;
}

.page-about .ab-awards__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: .88;
}

.page-about .ab-awards__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(20px, 3.2vw, 32px);
  background-color: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-award {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 26px);
  background-color: var(--deep);
}

.page-about .ab-award__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 21px);
  line-height: 1.3;
}

.page-about .ab-award p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ab-read);
}

/* ---------- 收尾 ---------- */
.page-about .ab-outro {
  padding: clamp(30px, 4.6vw, 56px) 0 clamp(44px, 6.4vw, 88px);
}

.page-about .ab-outro__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 28px);
  padding: clamp(22px, 3.4vw, 40px);
  border: 2px solid var(--steel);
  background-color: rgba(18, 57, 94, .4);
  background-image: radial-gradient(110% 130% at 100% 0%, rgba(123, 77, 255, .22), transparent 62%);
  box-shadow: var(--hard);
}

.page-about .ab-outro__inner h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
}

.page-about .ab-outro__inner p {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.84;
  color: var(--ab-read);
}

.page-about .ab-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .ab-stats__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .78fr);
  }

  .page-about .ab-tl__item {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 6px 26px;
    align-items: start;
  }

  .page-about .ab-tl__year {
    text-align: right;
    padding-top: 2px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-ops__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .ab-outro__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .ab-outro__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-awards__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-awards__grid .ab-award {
    min-height: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-zone,
  .page-about .ab-zone__mark {
    transition: none;
  }
}