.page-about {
  --about-texture: repeating-linear-gradient(135deg, rgba(53, 242, 224, .045) 0 1px, transparent 1px 16px);
  background: var(--abyss-950);
  color: var(--ink-050);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 82% 8%, rgba(53, 242, 224, .14) 0%, rgba(53, 242, 224, 0) 58%),
    radial-gradient(90% 80% at 4% 92%, rgba(255, 106, 43, .10) 0%, rgba(255, 106, 43, 0) 62%),
    var(--abyss-950);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-texture);
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  margin-bottom: clamp(24px, 5vw, 52px);
}

.page-about .crumb {
  color: var(--mist-300);
  text-decoration: none;
}

.page-about .crumb:hover {
  color: var(--cyan-200);
}

.page-about .crumb-sep {
  color: rgba(159, 178, 204, .5);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 58px);
  line-height: 1.14;
  letter-spacing: -.02em;
  margin: 14px 0 18px;
  max-width: 16em;
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 34em;
  color: var(--mist-300);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
}

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

.page-about .about-hero__frame {
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  overflow: hidden;
  box-shadow: 0 0 40px rgba(53, 242, 224, .08);
}

.page-about .about-hero__caption {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-300);
  max-width: 30em;
}

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

.page-about .about-hero__frame img {
  aspect-ratio: 4 / 3;
}

/* ---------- 三个数据牌 ---------- */
.page-about .figure-strip {
  display: grid;
  gap: 1px;
  margin-top: clamp(30px, 5vw, 52px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--line-soft);
}

.page-about .figure {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 22px 26px;
  background: var(--ocean-800);
}

.page-about .figure__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(40px, 6vw, 62px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan-400);
  text-shadow: 0 0 24px rgba(53, 242, 224, .35);
}

.page-about .figure__unit {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-050);
}

.page-about .figure__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist-300);
}

/* ---------- 通用章节带 ---------- */
.page-about .dossier-band {
  border-top: 1px solid var(--line-soft);
  background: var(--abyss-900);
}

.page-about .dossier-band--tint {
  background:
    linear-gradient(180deg, rgba(12, 24, 48, .9) 0%, rgba(7, 13, 28, 1) 100%),
    var(--ocean-800);
}

.page-about .dossier-band--tint .band__inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-texture);
  opacity: .35;
  pointer-events: none;
}

.page-about .band__inner {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(44px, 7vw, 96px) var(--gutter);
  display: grid;
  gap: clamp(18px, 3vw, 36px);
}

.page-about .band__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-weight: 200;
  font-size: clamp(44px, 8vw, 96px);
  line-height: .9;
  letter-spacing: -.04em;
  color: rgba(53, 242, 224, .3);
}

.page-about .band__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist-300);
}

.page-about .band__body {
  min-width: 0;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.24;
  letter-spacing: -.01em;
  margin: 0 0 16px;
  max-width: 20em;
}

.page-about .band__intro {
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .band__media {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .band__media .media-frame {
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .band__note {
  margin-top: 18px;
  padding-left: 16px;
  border-left: 2px solid var(--signal-500);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist-300);
  max-width: 40em;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline__track {
  position: relative;
  display: flex;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0 2px 4px;
  min-width: min-content;
}

.page-about .timeline__zigzag {
  position: absolute;
  left: 0;
  top: 6px;
  width: 100%;
  height: 46px;
  color: rgba(53, 242, 224, .32);
  pointer-events: none;
}

.page-about .timeline__node {
  position: relative;
  z-index: 1;
  flex: 0 0 232px;
  padding: 58px 18px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: var(--ocean-700);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  top: 22px;
  left: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 12px rgba(53, 242, 224, .75);
}

.page-about .timeline__node:hover,
.page-about .timeline__node:focus-within {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}

.page-about .timeline__node--now {
  border-color: rgba(255, 106, 43, .55);
  background: linear-gradient(160deg, rgba(255, 106, 43, .14) 0%, rgba(18, 39, 69, 1) 62%);
}

.page-about .timeline__node--now::before {
  background: var(--signal-500);
  box-shadow: 0 0 14px rgba(255, 106, 43, .8);
}

.page-about .timeline__name {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: .01em;
}

.page-about .timeline__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist-300);
}

/* ---------- 流水线 ---------- */
.page-about .pipeline {
  display: grid;
  gap: 16px;
}

.page-about .pipeline__step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 22px 20px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  border-top-color: var(--line-strong);
  background: var(--ocean-700);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .pipeline__step:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .pipeline__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan-400);
  flex: 0 0 auto;
}

.page-about .pipeline__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .pipeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist-300);
  max-width: 36em;
}

/* ---------- 团队分工 ---------- */
.page-about .crew {
  display: grid;
  gap: 18px;
}

.page-about .crew__item {
  padding: 20px 20px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: rgba(12, 24, 48, .72);
}

.page-about .crew__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .crew__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.page-about .crew__count {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--cyan-400);
}

.page-about .crew__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.76;
  color: var(--mist-300);
}

.page-about .crew__item .data-bar {
  height: 4px;
  border-radius: var(--r-pill);
  background: var(--ocean-600);
  overflow: hidden;
}

.page-about .crew__item .data-bar__fill {
  display: block;
  height: 100%;
  width: var(--fill, 0%);
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, rgba(53, 242, 224, .55), var(--cyan-400));
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .coverage__facts {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--line-soft);
  align-self: start;
}

.page-about .coverage__fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  background: var(--ocean-800);
}

.page-about .coverage__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan-400);
}

.page-about .coverage__label {
  font-size: 13.5px;
  color: var(--mist-300);
  line-height: 1.5;
}

.page-about .coverage__title {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .coverage__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-about .coverage__tags .tag {
  display: inline-block;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
}

.page-about .coverage__tags .tag--cyan {
  color: var(--cyan-200);
  background: rgba(53, 242, 224, .1);
  border: 1px solid var(--line-strong);
}

.page-about .coverage__text {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist-300);
  max-width: 34em;
}

.page-about .coverage__link {
  display: inline-block;
  color: var(--cyan-400);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px;
}

.page-about .coverage__link:hover {
  color: var(--cyan-200);
}

/* ---------- 规范与合作 ---------- */
.page-about .rules {
  display: grid;
  gap: 16px;
}

.page-about .rules__item.card {
  padding: 22px 22px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  border-top-color: var(--line-strong);
  background: var(--ocean-700);
  box-shadow: 0 0 30px rgba(53, 242, 224, .06);
}

.page-about .card__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan-400);
  margin-bottom: 10px;
}

.page-about .card__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist-300);
  max-width: 36em;
}

.page-about .rules__link.card--link {
  display: inline-block;
  margin-top: 14px;
  font-size: 13.5px;
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.page-about .rules__link.card--link:hover {
  color: var(--ink-050);
  border-bottom-color: var(--cyan-200);
}

.page-about .about-close {
  margin-top: clamp(28px, 5vw, 48px);
  padding: clamp(22px, 4vw, 34px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(140deg, rgba(255, 106, 43, .12) 0%, rgba(7, 13, 28, .9) 58%),
    var(--abyss-900);
}

.page-about .about-close__text {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-close__top.backtop {
  display: inline-block;
  padding: 11px 20px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  color: var(--mist-300);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  text-decoration: none;
}

.page-about .about-close__top.backtop:hover {
  color: var(--cyan-200);
  border-color: var(--line-strong);
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .figure-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .crew__item:last-child {
    grid-column: 1 / -1;
  }

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

  .page-about .rules__item:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .band__inner {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .band__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .coverage {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .pipeline {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .pipeline__step:nth-child(2) {
    margin-left: clamp(24px, 6vw, 72px);
  }

  .page-about .pipeline__step:nth-child(3) {
    margin-left: clamp(48px, 12vw, 144px);
  }

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

  .page-about .crew__item:last-child {
    grid-column: auto;
  }

  .page-about .timeline__node {
    flex-basis: 258px;
  }
}

@media (min-width: 1100px) {
  .page-about .rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .rules__item:first-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__node,
  .page-about .pipeline__step {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --fill: currentColor;
}