.page-about {
  --ab-line: rgba(92, 124, 134, 0.3);
  --ab-line-soft: rgba(92, 124, 134, 0.16);
  --ab-depth: rgba(5, 12, 22, 0.55);
  background:
    radial-gradient(120% 70% at 100% 0%, rgba(255, 77, 31, 0.09), transparent 62%),
    radial-gradient(90% 60% at 0% 34%, rgba(25, 227, 209, 0.07), transparent 58%);
  color: var(--paper);
  padding-bottom: clamp(32px, 6vw, 72px);
}

.page-about .ab-crumbs-bar {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .crumbs {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s var(--ease-out), border-color 0.15s var(--ease-out);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .crumbs__sep {
  padding: 0 6px;
  color: var(--ab-line);
}

/* ---------- HERO ---------- */
.page-about .ab-hero {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .ab-hero__frame {
  position: relative;
  border: 1px solid var(--ab-line);
  padding: clamp(20px, 4vw, 44px);
  background:
    linear-gradient(160deg, rgba(13, 27, 46, 0.92), rgba(7, 17, 31, 0.72) 62%, rgba(7, 17, 31, 0.4));
  background-image:
    linear-gradient(var(--flame), var(--flame)),
    linear-gradient(var(--flame), var(--flame)),
    linear-gradient(var(--cyan), var(--cyan)),
    linear-gradient(var(--cyan), var(--cyan)),
    linear-gradient(160deg, rgba(13, 27, 46, 0.92), rgba(7, 17, 31, 0.7) 62%, rgba(7, 17, 31, 0.36));
  background-size: 22px 1px, 1px 22px, 22px 1px, 1px 22px, 100% 100%;
  background-position: 0 0, 0 0, 100% 100%, 100% 100%, 0 0;
  background-repeat: no-repeat;
  overflow: hidden;
}

.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 60%;
  height: 180%;
  background: linear-gradient(102deg, transparent 34%, rgba(255, 77, 31, 0.16) 50%, transparent 66%);
  transform: rotate(4deg);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(18px, 3.5vw, 40px);
}

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

.page-about .ab-hero__year {
  font-family: var(--font-display);
  font-size: clamp(44px, 11vw, 76px);
  font-weight: 300;
  line-height: 0.86;
  letter-spacing: -0.04em;
  color: var(--gold);
  flex: 0 0 auto;
}

.page-about .ab-hero__ruler {
  position: relative;
  display: block;
  flex: 1 1 auto;
  height: 1px;
  background: var(--ab-line);
}

.page-about .ab-hero__ruler::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 9px;
  background-image: repeating-linear-gradient(to right, var(--ab-line) 0 1px, transparent 1px 12px);
}

.page-about .ab-hero__ruler::after {
  content: "";
  position: absolute;
  left: 34%;
  top: -4px;
  width: 2px;
  height: 9px;
  background: var(--flame);
}

.page-about .ab-hero__scale-note {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
  white-space: nowrap;
  flex: 0 0 auto;
}

.page-about .ab-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 7.2vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .ab-hero__title::after {
  content: "";
  display: block;
  width: 64px;
  height: 3px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--flame), var(--cyan));
}

.page-about .ab-hero__lead {
  margin-top: 20px;
  max-width: 62ch;
  color: var(--paper-soft);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .ab-jump {
  display: flex;
  gap: 8px;
  margin-top: 26px;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-jump::-webkit-scrollbar {
  display: none;
}

.page-about .ab-jump__link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 84px;
  padding: 10px 14px;
  border: 1px solid var(--ab-line);
  background: rgba(13, 27, 46, 0.55);
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.16s var(--ease-out), transform 0.16s var(--ease-out), background 0.16s var(--ease-out);
}

.page-about .ab-jump__link:hover,
.page-about .ab-jump__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(25, 227, 209, 0.08);
  transform: translateY(-2px);
}

.page-about .ab-jump__y {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .ab-jump__t {
  font-size: 12px;
  color: var(--mist);
}

/* ---------- ORIGIN ---------- */
.page-about .ab-origin__grid {
  display: grid;
  gap: clamp(20px, 4vw, 48px);
}

.page-about .ab-origin__title {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 4.6vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-origin__main p {
  color: var(--paper-soft);
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 14px;
  max-width: 62ch;
}

.page-about .ab-note {
  position: relative;
  align-self: start;
  padding: 22px 22px 24px;
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--gold);
  background:
    linear-gradient(180deg, rgba(244, 241, 234, 0.05), rgba(13, 27, 46, 0.5));
  box-shadow: 8px 8px 0 rgba(5, 12, 22, 0.35);
}

.page-about .ab-note__label {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0 0 10px;
}

.page-about .ab-note__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-soft);
}

/* ---------- TRACK ---------- */
.page-about .ab-track__head {
  max-width: 66ch;
}

.page-about .ab-track__title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-track__lead {
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
}

.page-about .ab-track__layout {
  margin-top: clamp(24px, 4vw, 44px);
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-track {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--flame), rgba(25, 227, 209, 0.7) 45%, var(--ab-line-soft));
}

.page-about .ab-track__item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 38px);
}

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

.page-about .ab-track__marker {
  position: absolute;
  left: -26px;
  top: 4px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--gold);
  background: var(--ink-3, #050C16);
  transform: rotate(45deg);
}

.page-about .ab-track__item:target .ab-track__marker {
  border-color: var(--flame);
  background: var(--flame);
  box-shadow: 0 0 0 4px rgba(255, 77, 31, 0.18);
}

.page-about .ab-track__item:target .ab-track__name {
  color: var(--flame);
}

.page-about .ab-track__year {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .ab-track__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.24;
  color: var(--paper);
  transition: color 0.16s var(--ease-out);
}

.page-about .ab-track__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper-soft);
  max-width: 58ch;
}

.page-about .ab-track__data {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  padding: 8px 12px;
  border-left: 2px solid var(--flame);
  background: rgba(13, 27, 46, 0.6);
  border-top: 1px solid var(--ab-line-soft);
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .ab-track__k {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .ab-track__v {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-about .ab-track__aside {
  margin: 0;
  align-self: start;
}

.page-about .ab-track__media {
  border: 1px solid var(--ab-line);
  background: var(--ink-2);
}

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

.page-about .ab-track__cap {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-track__cap .mono {
  display: block;
  color: var(--gold);
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

/* ---------- TEAM ---------- */
.page-about .ab-team {
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(22px, 4vw, 52px);
}

.page-about .ab-team__title {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-team__body p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--paper-soft);
  max-width: 60ch;
}

.page-about .ab-team__roles {
  list-style: none;
  margin: 22px 0 18px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-team__roles li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 14px;
  background: rgba(13, 27, 46, 0.72);
}

.page-about .ab-team__num {
  flex: 0 0 auto;
  min-width: 52px;
  font-size: 20px;
  color: var(--flame);
  letter-spacing: -0.01em;
}

.page-about .ab-team__role {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper-soft);
}

.page-about .ab-team__more {
  font-size: 14px;
  color: var(--mist);
  border-left: 2px solid var(--cyan);
  padding-left: 12px;
  margin-top: 4px;
}

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

.page-about .ab-team__media {
  border: 1px solid var(--ab-line);
  background: var(--ink-2);
}

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

.page-about .ab-team__cap {
  margin-top: 10px;
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* ---------- PRINCIPLES ---------- */
.page-about .ab-principles__head {
  max-width: 64ch;
}

.page-about .ab-principles__title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--paper);
}

.page-about .ab-principles__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-principles__grid {
  margin-top: clamp(22px, 4vw, 40px);
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

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

.page-about .ab-principles__media {
  border: 1px solid var(--ab-line);
  background: var(--ink-2);
}

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

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

.page-about .ab-face {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--ab-line);
  background: linear-gradient(158deg, rgba(13, 27, 46, 0.95), rgba(7, 17, 31, 0.72));
  transition: transform 0.18s var(--ease-out), border-color 0.18s var(--ease-out), box-shadow 0.18s var(--ease-out);
}

.page-about .ab-face::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 0;
  background: var(--flame);
  transition: height 0.22s var(--ease-out);
}

.page-about .ab-face:hover,
.page-about .ab-face:focus-visible,
.page-about .ab-face:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 0 10px 26px rgba(5, 12, 22, 0.5);
}

.page-about .ab-face:hover::before,
.page-about .ab-face:focus-visible::before,
.page-about .ab-face:focus-within::before {
  height: 100%;
}

.page-about .ab-face__idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .ab-face__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .ab-face__line {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper-soft);
}

.page-about .ab-face__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  opacity: 0;
  transition: max-height 0.26s var(--ease-out), opacity 0.2s var(--ease-out), margin-top 0.26s var(--ease-out);
}

.page-about .ab-face:hover .ab-face__more,
.page-about .ab-face:focus-visible .ab-face__more,
.page-about .ab-face:focus-within .ab-face__more {
  max-height: 8em;
  opacity: 1;
  margin-top: 10px;
}

.page-about .ab-principles__bridge {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--ab-line-soft);
  border-right: 3px solid var(--cyan);
  background: linear-gradient(90deg, rgba(25, 227, 209, 0.07), rgba(13, 27, 46, 0.4));
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-soft);
}

/* ---------- INFO ---------- */
.page-about .ab-info {
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .ab-info__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-info__grid {
  margin-top: clamp(20px, 3.5vw, 34px);
  display: grid;
  gap: 12px;
}

.page-about .ab-info__block {
  padding: 18px 18px 20px;
  border: 1px solid var(--ab-line-soft);
  background: rgba(13, 27, 46, 0.55);
}

.page-about .ab-info__k {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .ab-info__v {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
  word-break: break-word;
}

.page-about .ab-info__sub {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-info__next {
  margin-top: clamp(22px, 3.5vw, 34px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px dashed var(--ab-line);
}

.page-about .ab-info__next-title {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .ab-info__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(150px, 200px) minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 4vw, 52px);
  }

  .page-about .ab-hero__scale {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-top: 8px;
    border-right: 1px solid var(--ab-line-soft);
    padding-right: 16px;
    min-height: 260px;
  }

  .page-about .ab-hero__year {
    font-size: clamp(64px, 9vw, 112px);
  }

  .page-about .ab-hero__ruler {
    width: 1px;
    height: 100%;
    min-height: 90px;
    flex: 1 1 auto;
    background: var(--ab-line-soft);
  }

  .page-about .ab-hero__ruler::before {
    width: 9px;
    height: 100%;
    background-image: repeating-linear-gradient(to bottom, var(--ab-line) 0 1px, transparent 1px 14px);
  }

  .page-about .ab-hero__ruler::after {
    left: -4px;
    top: 34%;
    width: 9px;
    height: 2px;
    background: var(--flame);
  }

  .page-about .ab-hero__scale-note {
    writing-mode: horizontal-tb;
    white-space: normal;
    max-width: 12ch;
    line-height: 1.6;
  }

  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-track__layout {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 340px);
    align-items: start;
  }

  .page-about .ab-track__aside {
    position: sticky;
    top: 32px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-principles__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .ab-principles__figure {
    position: sticky;
    top: 32px;
  }

  .page-about .ab-info__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-track {
    padding-left: 34px;
  }

  .page-about .ab-track__marker {
    left: -34px;
  }

  .page-about .ab-faces {
    gap: 14px;
  }

  .page-about .ab-face {
    padding: 24px 24px 26px;
  }
}

@media (hover: none) {
  .page-about .ab-face__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-hero__frame::after {
    display: none;
  }

  .page-about .ab-jump__link,
  .page-about .ab-face,
  .page-about .ab-face::before,
  .page-about .ab-face__more {
    transition: none;
  }

  .page-about .ab-jump__link:hover,
  .page-about .ab-face:hover {
    transform: none;
  }
}
<<<END>>>