.page-about {
  --ab-body-text: rgba(243, 239, 228, 0.84);
  --ab-cut: 18px;
  --ab-soft: rgba(154, 163, 155, 0.14);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: 72px;
}
.page-about .container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding-inline: var(--pad-inline);
}

/* 首屏 */
.page-about .ab-hero {
  padding-top: 24px;
}
.page-about .ab-hero .breadcrumb {
  margin-bottom: 16px;
}
.page-about .ab-hero__frame {
  position: relative;
  margin-top: 6px;
  padding: 26px 18px 22px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(158deg, var(--ink-2) 0%, var(--deep) 58%, var(--ink) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
}
.page-about .ab-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: repeating-linear-gradient(90deg, var(--volt) 0 2px, transparent 2px 16px);
  opacity: 0.55;
}
.page-about .ab-hero__grid {
  display: grid;
  gap: 24px;
}
.page-about .ab-hero__eyebrow {
  color: var(--volt);
  margin: 0 0 12px;
}
.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  color: var(--paper);
  text-wrap: balance;
}
.page-about .ab-hero__lede {
  margin: 0 0 22px;
  max-width: 62ch;
  color: var(--ab-body-text);
  font-size: 1rem;
  line-height: 1.78;
}
.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
}
.page-about .ab-hero__stat {
  padding: 10px 12px;
  border-left: 2px solid var(--volt);
  background: rgba(11, 15, 14, 0.5);
}
.page-about .ab-hero__stat dt {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--fog);
  margin-bottom: 4px;
}
.page-about .ab-hero__stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--paper);
}
.page-about .ab-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}
.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-hero__media .media-caption {
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--fog);
  line-height: 1.6;
}

/* 主体两栏 */
.page-about .ab-body {
  margin-top: 40px;
}
.page-about .ab-body__inner {
  display: grid;
  gap: 32px;
}

/* 章节索引 */
.page-about .ab-index__label {
  color: var(--fog);
  margin: 0 0 10px;
}
.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .ab-index__list li {
  flex: 0 0 auto;
}
.page-about .ab-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.875rem;
  white-space: nowrap;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease), color 180ms var(--ease);
}
.page-about .ab-index__num {
  font-size: 0.75rem;
  color: var(--volt);
}
.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  border-color: var(--amber);
  background: rgba(255, 158, 27, 0.1);
  outline: none;
}

/* 章节 */
.page-about .ab-chapter {
  position: relative;
  padding: 26px 18px 28px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--volt);
  scroll-margin-top: 72px;
}
.page-about .ab-chapter + .ab-chapter {
  margin-top: 20px;
}
.page-about .ab-chapter--deep {
  background: linear-gradient(172deg, var(--deep) 0%, var(--ink-2) 88%);
  border-top-color: var(--volt);
}
.page-about .ab-chapter--wine {
  background: linear-gradient(188deg, var(--wine) 0%, var(--ink-2) 92%);
  border-top-color: var(--amber);
}
.page-about .ab-chapter--indigo {
  background: linear-gradient(168deg, var(--indigo) 0%, var(--ink-2) 90%);
  border-top-color: var(--sky);
}
.page-about .ab-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}
.page-about .ab-chapter__num {
  flex: 0 0 auto;
  font-size: clamp(1.6rem, 6vw, 2.6rem);
  line-height: 0.85;
  color: var(--volt);
  letter-spacing: -0.03em;
  opacity: 0.9;
}
.page-about .ab-chapter--wine .ab-chapter__num {
  color: var(--amber);
}
.page-about .ab-chapter--indigo .ab-chapter__num {
  color: var(--sky);
}
.page-about .ab-chapter__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.32rem, 4.4vw, 1.9rem);
  line-height: 1.24;
  margin: 0;
  color: var(--paper);
}
.page-about .ab-prose p {
  margin: 0 0 14px;
  color: var(--ab-body-text);
  font-size: 1rem;
  line-height: 1.8;
}
.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}

/* 呼号提示条 */
.page-about .ab-callout {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  border-left: 3px solid var(--amber);
  background: rgba(255, 158, 27, 0.08);
}
.page-about .ab-callout__text {
  margin: 0;
  flex: 1 1 260px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--paper);
}

/* 时间线 */
.page-about .ab-timeline {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-timeline__item {
  position: relative;
  padding: 16px 16px 16px 20px;
  background: var(--deep);
  border-left: 3px solid var(--volt);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: background-color 200ms var(--ease), border-color 200ms var(--ease);
}
.page-about .ab-timeline__item:nth-child(even) {
  background: var(--wine);
  border-left-color: var(--amber);
}
.page-about .ab-timeline__item:hover,
.page-about .ab-timeline__item:focus-within {
  border-left-color: var(--amber);
  background: #0d3536;
}
.page-about .ab-timeline__item:nth-child(even):hover {
  background: #571627;
}
.page-about .ab-timeline__year {
  margin: 0 0 6px;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--volt);
}
.page-about .ab-timeline__item:nth-child(even) .ab-timeline__year {
  color: var(--amber);
}
.page-about .ab-timeline__title {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--paper);
}
.page-about .ab-timeline__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--ab-body-text);
}

/* 通用图 */
.page-about .ab-figure {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  background: var(--ink);
}
.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-figure .media-caption {
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--fog);
  line-height: 1.6;
}
.page-about .ab-version {
  margin: 18px 0 0;
  font-size: 0.875rem;
  color: var(--fog);
}
.page-about .ab-version .mono-num {
  color: var(--sky);
}

/* 双通道 */
.page-about .ab-channels {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}
.page-about .ab-channel {
  padding: 18px 16px;
  background: rgba(11, 15, 14, 0.55);
  border: 1px solid var(--line-strong);
  border-bottom: 3px solid var(--volt);
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}
.page-about .ab-channel--alt {
  border-bottom-color: var(--sky);
}
.page-about .ab-channel:hover {
  background: rgba(11, 15, 14, 0.75);
  border-bottom-color: var(--amber);
}
.page-about .ab-channel__tag {
  margin: 0 0 8px;
  color: var(--volt);
}
.page-about .ab-channel--alt .ab-channel__tag {
  color: var(--sky);
}
.page-about .ab-channel__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--paper);
}
.page-about .ab-channel__text {
  margin: 0 0 12px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ab-body-text);
}
.page-about .ab-channel__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.page-about .ab-channel__list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--paper);
}
.page-about .ab-channel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 7px;
  height: 2px;
  background: var(--amber);
}
.page-about .ab-tip {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--fog);
  background: rgba(243, 239, 228, 0.05);
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--ab-body-text);
}

/* 流程 */
.page-about .ab-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: none;
}
.page-about .ab-steps__item {
  position: relative;
  padding: 16px 16px 16px 56px;
  border: 1px solid var(--line);
  background: var(--ink);
  transition: border-color 200ms var(--ease);
}
.page-about .ab-steps__item:hover {
  border-color: var(--volt);
}
.page-about .ab-steps__num {
  position: absolute;
  left: 14px;
  top: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-size: 0.8125rem;
  color: var(--ink);
  background: var(--volt);
}
.page-about .ab-steps__title {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--paper);
}
.page-about .ab-steps__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--ab-body-text);
}
.page-about .ab-note {
  margin: 18px 0 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--fog);
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

/* 团队 */
.page-about .ab-team {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}
.page-about .ab-team__card {
  padding: 16px;
  background: rgba(11, 15, 14, 0.5);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--sky);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease), background-color 200ms var(--ease);
}
.page-about .ab-team__card:hover,
.page-about .ab-team__card:focus-visible {
  border-left-color: var(--volt);
  background: rgba(11, 15, 14, 0.7);
  outline: none;
}
.page-about .ab-team__num {
  margin: 0 0 4px;
  font-size: 2.2rem;
  line-height: 1;
  color: var(--volt);
}
.page-about .ab-team__label {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--paper);
}
.page-about .ab-team__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--ab-body-text);
}

/* 覆盖 */
.page-about .ab-coverage {
  margin-top: 22px;
  display: grid;
  gap: 0;
  border: 1px solid var(--line-strong);
  background: rgba(11, 15, 14, 0.45);
}
.page-about .ab-coverage__media {
  margin: 0;
}
.page-about .ab-coverage__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-coverage__body {
  padding: 18px 16px;
}
.page-about .ab-coverage__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--paper);
}
.page-about .ab-coverage__text {
  margin: 0 0 14px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ab-body-text);
}
.page-about .ab-coverage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .ab-coverage__list li {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--paper);
  padding: 8px 10px;
  background: rgba(45, 125, 255, 0.09);
  border-left: 2px solid var(--sky);
}
.page-about .ab-coverage__list .mono-num {
  color: var(--volt);
  margin-right: 2px;
}

/* 合作 */
.page-about .ab-partners {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}
.page-about .ab-partners__block {
  padding: 16px;
  background: var(--deep);
  border-top: 3px solid var(--volt);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.page-about .ab-partners__block--alt {
  background: var(--indigo);
  border-top-color: var(--sky);
}
.page-about .ab-partners__block--volt {
  background: var(--wine);
  border-top-color: var(--amber);
}
.page-about .ab-partners__num {
  margin: 0 0 4px;
  font-size: 2rem;
  line-height: 1;
  color: var(--paper);
}
.page-about .ab-partners__label {
  margin: 0 0 8px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}
.page-about .ab-partners__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ab-body-text);
}

/* 收尾 */
.page-about .ab-next {
  margin-top: 28px;
  padding: 24px 18px;
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--amber);
  background: linear-gradient(150deg, rgba(255, 158, 27, 0.09) 0%, rgba(11, 15, 14, 0.9) 70%);
}
.page-about .ab-next__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.24rem, 4.4vw, 1.7rem);
  line-height: 1.25;
  color: var(--paper);
}
.page-about .ab-next__text {
  margin: 0 0 18px;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ab-body-text);
}
.page-about .ab-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.page-about .ab-next__link {
  font-size: 0.9rem;
}

@media (min-width: 640px) {
  .page-about .ab-hero__frame {
    padding: 34px 28px 28px;
  }
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-chapter {
    padding: 30px 26px 32px;
  }
  .page-about .ab-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: stretch;
  }
  .page-about .ab-coverage__media img {
    height: 100%;
    object-fit: cover;
  }
  .page-about .ab-next {
    padding: 32px 30px;
  }
}

@media (min-width: 960px) {
  .page-about {
    padding-bottom: 96px;
  }
  .page-about .ab-hero {
    padding-top: 36px;
  }
  .page-about .ab-hero__frame {
    padding: 44px 40px 36px;
  }
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 34px;
    align-items: start;
  }
  .page-about .ab-body__inner {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .ab-index {
    position: sticky;
    top: 24px;
    border-right: 1px solid var(--line);
    padding-right: 18px;
  }
  .page-about .ab-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
    padding-bottom: 0;
  }
  .page-about .ab-index__link {
    display: flex;
    width: 100%;
    border-color: transparent;
    border-left: 2px solid transparent;
    padding: 8px 10px;
    font-size: 0.875rem;
    white-space: normal;
  }
  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible {
    border-left-color: var(--amber);
    background: rgba(255, 158, 27, 0.07);
  }
  .page-about .ab-chapter {
    padding: 36px 38px 38px;
  }
  .page-about .ab-chapter + .ab-chapter {
    margin-top: 24px;
  }
  .page-about .ab-prose p {
    font-size: 1.0625rem;
    max-width: 68ch;
  }
  .page-about .ab-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .ab-timeline__item:first-child {
    grid-column: 1 / -1;
  }
  .page-about .ab-version {
    font-size: 0.9375rem;
  }
  .page-about .ab-next {
    padding: 40px 38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__link,
  .page-about .ab-timeline__item,
  .page-about .ab-channel,
  .page-about .ab-team__card,
  .page-about .ab-steps__item {
    transition: none;
  }
}
<<<END>>>