.page-about {
  --ab-gap: clamp(20px, 4vw, 48px);
  --ab-cut: 28px;
  background: var(--ink);
  color: var(--fog);
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding-block: 18px 4px;
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero {
  padding-block: clamp(14px, 3vw, 36px) clamp(40px, 6vw, 84px);
}

.page-about .ab-hero__frame {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 58px);
  background:
    linear-gradient(142deg, rgba(90, 15, 30, 0.94) 0%, rgba(37, 26, 77, 0.72) 44%, rgba(16, 17, 20, 0.97) 100%);
  border: 1px solid rgba(74, 155, 255, 0.34);
  clip-path: polygon(var(--ab-cut) 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%, 0 var(--ab-cut));
}

.page-about .ab-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(138, 144, 153, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(138, 144, 153, 0.09) 1px, transparent 1px);
  background-size: 58px 58px;
  pointer-events: none;
}

.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(228, 255, 63, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .frame__corner {
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(228, 255, 63, 0.78);
  z-index: 2;
}

.page-about .frame__corner--tl {
  top: 12px;
  left: 12px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .frame__corner--tr {
  top: 12px;
  right: 12px;
  border-left: 0;
  border-bottom: 0;
}

.page-about .frame__corner--bl {
  bottom: 12px;
  left: 12px;
  border-right: 0;
  border-top: 0;
}

.page-about .frame__corner--br {
  bottom: 12px;
  right: 12px;
  border-left: 0;
  border-top: 0;
}

.page-about .frame__index {
  position: relative;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--neon);
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(228, 255, 63, 0.34);
}

.page-about .ab-hero__body {
  position: relative;
  max-width: 52ch;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .ab-hero__kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--blau);
  margin-bottom: 12px;
}

.page-about .ab-hero h1 {
  font-size: clamp(1.85rem, 4.4vw, 3.35rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.page-about .ab-hero__lede {
  font-size: clamp(1rem, 1.4vw, 1.08rem);
  line-height: 1.85;
  color: #d8dbdf;
  max-width: 62ch;
}

.page-about .ab-hero__stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 48px);
  background: rgba(138, 144, 153, 0.18);
  border: 1px solid rgba(138, 144, 153, 0.18);
}

.page-about .ab-hero__stats li {
  background: rgba(16, 17, 20, 0.74);
  padding: 16px 18px 18px;
}

.page-about .ab-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.55rem, 3.2vw, 2.35rem);
  color: var(--neon);
  line-height: 1.05;
}

.page-about .ab-hero__num small {
  font-size: 0.52em;
  margin-left: 2px;
}

.page-about .ab-hero__cap {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--steel);
}

/* ---------- 区块通用 ---------- */
.page-about .ab-section {
  padding-block: clamp(46px, 7vw, 100px);
}

.page-about .ab-section .section__head {
  margin-bottom: clamp(24px, 3vw, 40px);
}

.page-about .ab-section .section__title {
  font-size: clamp(1.4rem, 2.8vw, 2.3rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.24;
}

.page-about .ab-section .section__kicker {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  color: var(--blau);
  margin-bottom: 10px;
}

/* ---------- 读者 ---------- */
.page-about .ab-readers {
  background: linear-gradient(180deg, rgba(6, 48, 46, 0.62) 0%, rgba(6, 48, 46, 0) 88%);
  border-top: 1px solid rgba(138, 144, 153, 0.12);
}

.page-about .ab-readers__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .ab-reader {
  padding: 24px 24px 20px;
  background: rgba(16, 17, 20, 0.66);
  border: 1px solid rgba(138, 144, 153, 0.16);
  border-left: 3px solid var(--blau);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: border-color 240ms var(--ease), background-color 240ms var(--ease);
}

.page-about .ab-reader:nth-child(2) {
  border-left-color: var(--ziegel);
}

.page-about .ab-reader:nth-child(3) {
  border-left-color: var(--neon);
}

.page-about .ab-reader:hover {
  background: rgba(16, 17, 20, 0.86);
}

.page-about .ab-reader h3 {
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 12px;
}

.page-about .ab-reader p {
  font-size: 0.94rem;
  line-height: 1.78;
  color: #c9ced4;
}

.page-about .ab-reader__link {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.page-about .ab-reader__link a {
  color: var(--blau);
  text-decoration: none;
  border-bottom: 1px solid rgba(74, 155, 255, 0.42);
  padding-bottom: 2px;
}

.page-about .ab-reader__link a:hover,
.page-about .ab-reader__link a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ---------- 数据来路 ---------- */
.page-about .ab-source {
  border-top: 1px solid rgba(138, 144, 153, 0.12);
}

.page-about .ab-source__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: start;
}

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

.page-about .ab-source__media img,
.page-about .ab-history__media img,
.page-about .ab-outro__media img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .ab-source__text p {
  font-size: 1rem;
  line-height: 1.85;
  color: #ccd1d7;
  margin-top: 16px;
}

.page-about .ab-source__text .section__title {
  margin-top: 4px;
}

.page-about .ab-source__list {
  margin-top: 26px;
  border-top: 1px solid rgba(138, 144, 153, 0.18);
}

.page-about .ab-source__list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid rgba(138, 144, 153, 0.1);
}

.page-about .ab-source__list strong {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--blau);
}

.page-about .ab-source__list span {
  font-size: 0.94rem;
  line-height: 1.75;
  color: #c9ced4;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  background: linear-gradient(180deg, rgba(37, 26, 77, 0.55) 0%, rgba(37, 26, 77, 0) 90%);
  border-top: 1px solid rgba(138, 144, 153, 0.12);
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(138, 144, 153, 0.18);
  border: 1px solid rgba(138, 144, 153, 0.18);
}

.page-about .ab-role {
  background: rgba(16, 17, 20, 0.82);
}

.page-about .ab-role summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 2px 16px;
  padding: 22px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-role summary::marker {
  content: "";
}

.page-about .ab-role summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
}

.page-about .ab-role__count {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  transition: color 240ms var(--ease);
}

.page-about .ab-role__name {
  font-size: 1.05rem;
  font-weight: 800;
}

.page-about .ab-role__hint {
  font-size: 0.82rem;
  color: var(--steel);
}

.page-about .ab-role[open] .ab-role__count {
  color: var(--blau);
}

.page-about .ab-role__body {
  padding: 0 22px 22px;
  border-top: 1px dashed rgba(138, 144, 153, 0.22);
}

.page-about .ab-role__body p {
  margin-top: 16px;
  font-size: 0.93rem;
  line-height: 1.78;
  color: #c9ced4;
}

/* ---------- 时间线 ---------- */
.page-about .ab-history {
  border-top: 1px solid rgba(138, 144, 153, 0.12);
}

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

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 34px 28px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: -6px;
  width: 1px;
  background: linear-gradient(180deg, rgba(74, 155, 255, 0.5), rgba(138, 144, 153, 0.12));
}

.page-about .ab-timeline__item:last-child::before {
  display: none;
}

.page-about .ab-timeline__mark {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .ab-timeline__dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--blau);
}

.page-about .ab-timeline__year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--neon);
}

.page-about .ab-timeline__body h3 {
  font-size: 1.12rem;
  font-weight: 800;
  line-height: 1.42;
  margin-bottom: 10px;
}

.page-about .ab-timeline__body p {
  font-size: 0.95rem;
  line-height: 1.82;
  color: #c9ced4;
}

.page-about .ab-timeline__meta {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--ziegel);
}

.page-about .ab-history__media {
  margin: clamp(26px, 4vw, 46px) 0 0;
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-cadence {
  border-top: 1px solid rgba(138, 144, 153, 0.12);
}

.page-about .ab-cadence__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 52px);
  background: linear-gradient(118deg, var(--rot) 0%, #3b0a14 54%, var(--ink) 100%);
  border: 1px solid rgba(228, 255, 63, 0.24);
  clip-path: polygon(var(--ab-cut) 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%, 0 var(--ab-cut));
}

.page-about .ab-cadence__panel .section__kicker {
  color: var(--neon);
}

.page-about .ab-cadence__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .ab-step {
  background: rgba(16, 17, 20, 0.62);
  padding: 22px;
  border-left: 2px solid rgba(74, 155, 255, 0.6);
}

.page-about .ab-step:nth-child(2) {
  border-left-color: rgba(228, 255, 63, 0.7);
}

.page-about .ab-step:nth-child(3) {
  border-left-color: var(--ziegel);
}

.page-about .ab-step__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .ab-step h3 {
  margin: 12px 0 8px;
  font-size: 1.1rem;
  font-weight: 800;
}

.page-about .ab-step p {
  font-size: 0.92rem;
  line-height: 1.78;
  color: #d5d8dc;
}

/* ---------- 结尾 ---------- */
.page-about .ab-outro {
  padding-bottom: clamp(56px, 8vw, 110px);
}

.page-about .ab-outro__frame {
  position: relative;
}

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

.page-about .ab-outro__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(16, 17, 20, 0.25) 0%, rgba(16, 17, 20, 0.86) 100%);
  pointer-events: none;
}

.page-about .ab-outro__frame {
  position: relative;
  overflow: hidden;
}

.page-about .ab-outro__text {
  position: relative;
  margin-top: -70px;
  padding: clamp(22px, 3.4vw, 40px);
  max-width: 680px;
  background: rgba(16, 17, 20, 0.94);
  border-left: 3px solid var(--neon);
}

.page-about .ab-outro__text h2 {
  font-size: clamp(1.3rem, 2.6vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.28;
  margin-bottom: 14px;
}

.page-about .ab-outro__text p {
  font-size: 0.97rem;
  line-height: 1.82;
  color: #c9ced4;
}

.page-about .ab-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-source__list li {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-readers__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .ab-source__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .ab-cadence__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: rgba(242, 243, 245, 0.16);
  }
}

@media (min-width: 900px) {
  .page-about .ab-timeline__item {
    display: grid;
    grid-template-columns: 158px minmax(0, 1fr);
    gap: 30px;
    padding: 0 0 40px 34px;
  }

  .page-about .ab-timeline__mark {
    justify-content: flex-end;
    margin-bottom: 0;
  }

  .page-about .ab-timeline__dot {
    top: 6px;
  }

  .page-about .ab-timeline__body h3 {
    margin-top: -4px;
  }

  .page-about .ab-outro__text {
    margin-left: clamp(0px, 6vw, 96px);
    margin-top: -110px;
  }
}

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