.page-about {
  --ab-rail: 240px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.55;
  -webkit-mask-image: radial-gradient(120% 95% at 12% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 95% at 12% 0%, #000 0%, transparent 72%);
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: 46%;
  height: 160%;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(108, 43, 217, 0.42), rgba(0, 229, 255, 0.06) 65%, transparent);
  transform: skewX(-14deg);
}
.page-about .ab-hero > * {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero__inner {
  margin-top: 24px;
}
.page-about .ab-hero__lead .ph-title {
  max-width: 22ch;
  margin-top: 10px;
}
.page-about .ab-hero__lead .ph-lede {
  max-width: 46ch;
  margin-top: 18px;
}
.page-about .ab-hero__note {
  margin-top: 24px;
}
.page-about .ab-hero__note .ph-mono {
  margin: 0 0 6px;
}
.page-about .ab-hero__note .ph-mono:last-child {
  margin-bottom: 0;
}

/* 关键数字带 */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-stats .ph-stat {
  background: var(--ink-2);
  padding: 16px 14px;
  border-top: 2px solid var(--violet);
}
.page-about .ab-stats .ph-stat__value {
  color: var(--cyan);
}

/* ---------- 主栏 + 锚点栏 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
.page-about .ab-layout__main {
  min-width: 0;
}
.page-about .ab-layout__rail {
  order: -1;
  border-bottom: 1px solid var(--line);
  padding: 16px 0 18px;
}

.page-about .ph-toc__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}
.page-about .ph-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
}
.page-about .ph-toc__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 6px 10px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page-about .ph-toc__link:hover,
.page-about .ph-toc__link:focus-visible,
.page-about .ph-toc__link[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding: 44px 0 52px;
  border-top: 1px solid var(--line);
}
.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 34px;
}
.page-about .ab-sec .ph-section__head .ph-lede {
  max-width: 62ch;
  margin-top: 14px;
}

/* 图注与图片 */
.page-about .ab-figure {
  margin: 26px 0 0;
}
.page-about .ab-figure__cap {
  margin: 10px 0 0;
  color: var(--gray);
}
.page-about .ab-figure--side {
  max-width: 420px;
  margin-top: 30px;
}
.page-about .ab-figure .ph-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

/* ---------- 纵向时间轴 ---------- */
.page-about .ab-timeline {
  margin-top: 34px;
}
.page-about .ab-node {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: 34px;
  position: relative;
}
.page-about .ab-node:last-child {
  padding-bottom: 0;
}
.page-about .ab-node__marker {
  grid-column: 1;
  grid-row: 1 / span 2;
  position: relative;
}
.page-about .ab-node__marker::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 14px;
  bottom: -34px;
  width: 1px;
  background: var(--line);
  transform: translateX(-0.5px);
}
.page-about .ab-node:last-child .ab-node__marker::before {
  bottom: auto;
  height: 22px;
}
.page-about .ab-node__dot {
  position: absolute;
  left: 50%;
  top: 7px;
  width: 11px;
  height: 11px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--ink);
  border: 1px solid var(--cyan);
}
.page-about .ab-node--cal .ab-node__dot {
  border-color: var(--orange);
}
.page-about .ab-node__year {
  grid-column: 2;
  grid-row: 1;
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.page-about .ab-node__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 9vw, 3.2rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--mist);
}
.page-about .ab-node__body {
  grid-column: 2;
  grid-row: 2;
  margin-top: 10px;
}
.page-about .ab-node__body p {
  margin: 0;
}
.page-about .ab-node__note {
  margin-top: 10px !important;
  color: var(--gray);
}
.page-about .ab-node--cal .ab-node__note {
  color: var(--violet-soft);
}

/* ---------- 版本表 ---------- */
.page-about .ab-versions {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-version {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  background: var(--ink-2);
  padding: 18px 18px 20px;
  border-left: 2px solid transparent;
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}
.page-about .ab-version:hover {
  border-left-color: var(--cyan);
  background: #151b2b;
}
.page-about .ab-version__no {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.7rem;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}
.page-about .ab-version__when {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray);
}
.page-about .ab-version__desc {
  margin: 0;
  color: var(--mist);
}

/* ---------- 奶油插页：团队 ---------- */
.page-about .ab-sec--cream {
  background: var(--cream);
  color: var(--brown);
  border: 1px solid var(--cream-line);
  padding: 30px 22px 34px;
}
.page-about .ab-sec--cream .ph-subtitle,
.page-about .ab-sec--cream .ph-lede {
  color: var(--brown);
}
.page-about .ab-sec--cream .ph-kicker {
  color: var(--violet);
}
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 22px;
}
.page-about .ab-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--cream-line);
}
.page-about .ab-team__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--cream-line);
}
.page-about .ab-team__list .ph-mono {
  color: var(--violet);
}
.page-about .ab-team__list span:last-child {
  color: var(--brown);
}
.page-about .ab-team__media {
  margin: 0;
}
.page-about .ab-team__media .ph-media__img {
  border: 1px solid var(--cream-line);
}
.page-about .ab-team__media .ab-figure__cap {
  color: var(--cream-muted);
}

/* ---------- 记录流程步骤 ---------- */
.page-about .ab-steps {
  list-style: none;
  counter-reset: abstep;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-steps li {
  counter-increment: abstep;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .ab-steps li::before {
  content: counter(abstep, decimal-leading-zero);
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  padding-top: 4px;
}
.page-about .ab-steps__title {
  margin: 0 0 6px;
  font-weight: 700;
  color: var(--mist);
}
.page-about .ab-steps li p:last-child {
  margin: 0;
  color: var(--gray);
}

/* ---------- 更新节奏卡片 ---------- */
.page-about .ab-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 26px;
}
.page-about .ab-cadence__card {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  padding: 20px 18px 22px;
}
.page-about .ab-cadence__card--violet {
  border-top-color: var(--violet);
}
.page-about .ab-cadence__card--orange {
  border-top-color: var(--orange);
}
.page-about .ab-cadence__when {
  margin: 0;
  color: var(--gray);
}
.page-about .ab-cadence__title {
  margin: 10px 0 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--mist);
}
.page-about .ab-cadence__card p:last-child {
  margin: 0;
  color: var(--gray);
}
.page-about .ab-cadence__tail {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--violet);
  color: var(--mist);
}
.page-about .ab-cadence__tail .ph-link-inline {
  color: var(--cyan);
}

/* ---------- 协作与认可 ---------- */
.page-about .ab-partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 26px;
}
.page-about .ab-partner__card {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--violet);
  padding: 20px 18px 22px;
}
.page-about .ab-partner__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 12vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}
.page-about .ab-partner__title {
  margin: 10px 0 8px;
  font-weight: 700;
  color: var(--mist);
}
.page-about .ab-partner__card p:last-child {
  margin: 0;
  color: var(--gray);
}

/* ---------- 下一赛季收尾带 ---------- */
.page-about .ab-next {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--violet);
  background:
    linear-gradient(120deg, rgba(108, 43, 217, 0.92) 0%, rgba(18, 23, 36, 0.96) 68%),
    var(--ink);
  padding: 44px 0 52px;
  clip-path: polygon(0 18px, 100% 0, 100% 100%, 0 100%);
}
.page-about .ab-next .ph-kicker {
  color: var(--cyan);
}
.page-about .ab-next__title {
  color: #fff;
  max-width: 24ch;
  margin-top: 10px;
}
.page-about .ab-next__text {
  max-width: 68ch;
  margin: 16px 0 0;
  color: var(--mist);
}
.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-stats .ph-stat {
    padding: 20px 18px;
  }
  .page-about .ab-team__list li {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 16px;
  }
  .page-about .ab-cadence,
  .page-about .ab-partner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-version {
    grid-template-columns: 90px 150px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 20px;
    padding: 18px 20px;
  }
  .page-about .ab-version__desc {
    grid-column: 3;
  }
}

@media (min-width: 900px) {
  .page-about .ab-node {
    grid-template-columns: minmax(0, 1fr) 40px minmax(0, 1fr);
    column-gap: 26px;
    padding-bottom: 48px;
  }
  .page-about .ab-node__marker {
    grid-column: 2;
    grid-row: 1;
  }
  .page-about .ab-node__marker::before {
    bottom: -48px;
  }
  .page-about .ab-node:last-child .ab-node__marker::before {
    height: 26px;
  }
  .page-about .ab-node__year {
    grid-column: 1;
    grid-row: 1;
    justify-content: flex-end;
    text-align: right;
  }
  .page-about .ab-node__body {
    grid-column: 3;
    grid-row: 1;
    margin-top: 6px;
  }
  .page-about .ab-node--flip .ab-node__year {
    grid-column: 3;
    grid-row: 1;
    justify-content: flex-start;
    text-align: left;
  }
  .page-about .ab-node--flip .ab-node__body {
    grid-column: 1;
    grid-row: 1;
  }
  .page-about .ab-node__num {
    font-size: clamp(3rem, 5vw, 4.2rem);
  }
  .page-about .ab-team {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
    gap: 30px;
  }
  .page-about .ab-sec--cream {
    padding: 36px 32px 40px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-layout {
    grid-template-columns: minmax(0, 1fr) var(--ab-rail);
    column-gap: 52px;
  }
  .page-about .ab-layout__rail {
    order: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 34px 0 0 24px;
  }
  .page-about .ab-toc {
    position: sticky;
    top: 112px;
  }
  .page-about .ph-toc__list {
    display: block;
    margin-top: 12px;
  }
  .page-about .ph-toc__link {
    display: block;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 7px 0 7px 14px;
    margin-left: -1px;
  }
  .page-about .ph-toc__link[aria-current="true"] {
    border-left-color: var(--cyan);
  }
  .page-about .ab-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-next {
    padding: 58px 0 64px;
  }
}

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