.page-about {
  --about-rail: 120px;
  --about-line-gold: rgba(185, 138, 46, 0.45);
  --about-line-cyan: rgba(39, 224, 200, 0.42);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-top: clamp(14px, 2.2vw, 26px);
  padding: clamp(24px, 4vw, 58px);
  border-radius: calc(var(--r-lg) + 10px);
  background: var(--deep);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -48%;
  right: -18%;
  width: 72%;
  height: 196%;
  border-radius: var(--r-lg);
  transform: rotate(11deg);
  background: linear-gradient(155deg, rgba(215, 240, 234, 0.15), rgba(39, 224, 200, 0.07) 52%, transparent 78%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: 0;
  bottom: 0;
  width: min(300px, 46%);
  height: 4px;
  border-radius: 0 var(--r-pill) var(--r-pill) 0;
  background: var(--orange);
  opacity: 0.85;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.5vw, 46px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 0.5em 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 50px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  max-width: 54ch;
  margin-top: clamp(14px, 2vw, 22px);
  color: rgba(232, 217, 168, 0.86);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  padding: 7px 15px;
  border: 1px solid var(--about-line-cyan);
  border-radius: var(--r-pill);
  background: rgba(39, 224, 200, 0.07);
  color: var(--cyanpaper);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
}

.page-about .about-hero__media .media-frame {
  border: 1px solid rgba(232, 217, 168, 0.2);
  border-radius: var(--r-lg);
  box-shadow: 0 34px 60px -42px rgba(0, 0, 0, 0.92);
  transform: rotate(-1.2deg);
}

/* ---------- 章节区块 ---------- */
.page-about .chapter-block {
  padding: clamp(44px, 7vw, 82px) 0;
}

.page-about .chapter-block + .chapter-block {
  border-top: 1px dashed var(--about-line-gold);
}

.page-about .chapter-block__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 34px);
}

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

.page-about .chapter-block__rail .chapter-no {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(46px, 9vw, 92px);
  line-height: 0.88;
  letter-spacing: -0.05em;
  color: var(--orange);
}

.page-about .chapter-block__kicker {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist-ink);
}

.page-about .chapter-block__body h2 {
  margin: 0 0 0.7em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.9vw, 34px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .chapter-block__body p {
  margin: 0 0 1.05em;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(18, 19, 15, 0.88);
}

.page-about .chapter-block__body p:last-child {
  margin-bottom: 0;
}

.page-about .chapter-block__body .note {
  margin-top: clamp(14px, 2vw, 20px);
  padding-left: 14px;
  border-left: 3px solid var(--gold);
  color: var(--mist-ink);
}

.page-about .about-inline-link {
  color: var(--cyan-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--wine);
}

/* ---------- 深色章节变体 ---------- */
.page-about .chapter-block--dark {
  margin: clamp(20px, 3vw, 36px) 0;
  padding: clamp(28px, 4.4vw, 62px);
  border-top: 0 !important;
  border-radius: var(--r-lg);
  color: var(--cyanpaper);
}

.page-about .chapter-block--indigo {
  background: var(--indigo);
}

.page-about .chapter-block--wine {
  background: var(--wine);
}

.page-about .chapter-block--dark .chapter-block__rail .chapter-no {
  color: var(--cyan);
}

.page-about .chapter-block--dark .chapter-block__kicker {
  color: rgba(215, 240, 234, 0.72);
}

.page-about .chapter-block--dark .chapter-block__body h2 {
  color: var(--paper);
}

.page-about .chapter-block--dark .chapter-block__body p {
  color: rgba(215, 240, 234, 0.86);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  margin: clamp(26px, 3.6vw, 44px) 0 0;
}

.page-about .about-timeline__cap {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-timeline__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-node {
  position: relative;
  padding-left: 34px;
  min-height: 62px;
}

.page-about .tl-node__dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 16px;
  height: 16px;
  border: 3px solid var(--gold);
  border-radius: 50%;
  background: var(--indigo);
  transition: background-color 180ms ease, border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: -24px;
  left: 8px;
  border-left: 2px dashed var(--about-line-cyan);
}

.page-about .tl-node:last-child::before {
  display: none;
}

.page-about .tl-node__ver {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .tl-node__label {
  display: block;
  margin-top: 5px;
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(215, 240, 234, 0.78);
}

.page-about .tl-node:hover .tl-node__dot,
.page-about .tl-node:focus-within .tl-node__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(39, 224, 200, 0.18);
  transform: scale(1.12);
}

.page-about .tl-node:hover .tl-node__label,
.page-about .tl-node:focus-within .tl-node__label {
  color: var(--cyanpaper);
}

.page-about .about-timeline__media {
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about .about-timeline__media .media-frame {
  border-radius: var(--r-md);
  border: 1px solid rgba(39, 224, 200, 0.24);
}

/* ---------- 标签行 ---------- */
.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 0 0 1.2em;
  padding: 0;
  list-style: none;
}

/* ---------- 纠错折叠块 ---------- */
.page-about .about-fold {
  margin-top: clamp(18px, 2.4vw, 26px);
  padding: 14px 18px 16px;
  border: 1px dashed var(--about-line-cyan);
  border-radius: var(--r-md);
  background: rgba(215, 240, 234, 0.05);
}

.page-about .about-fold > summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-fold > summary::marker {
  color: var(--orange);
}

.page-about .about-fold__list {
  margin: 12px 0 0;
  padding-left: 1.15em;
  list-style: disc;
}

.page-about .about-fold__list li {
  margin-bottom: 6px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(18, 19, 15, 0.82);
}

/* ---------- 校对图片 ---------- */
.page-about .about-media {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-media .media-frame {
  max-width: 560px;
  border-radius: var(--r-md);
  border: 1px solid rgba(185, 138, 46, 0.35);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 24px);
  margin: clamp(22px, 3vw, 32px) 0 clamp(20px, 2.8vw, 30px);
}

.page-about .about-role {
  padding: clamp(18px, 2.4vw, 24px);
  border-radius: var(--r-md);
  background: rgba(232, 217, 168, 0.09);
  border: 1px solid rgba(232, 217, 168, 0.2);
}

.page-about .about-role__n {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(32px, 5vw, 42px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-role__name {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-role p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(215, 240, 234, 0.82);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(40px, 6vw, 72px) 0 clamp(24px, 3vw, 36px);
}

.page-about .about-next .rule {
  margin-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .about-next__title {
  margin: 0 0 0.6em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 32px);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-next__lede {
  max-width: 62ch;
  margin: 0 0 clamp(20px, 2.8vw, 30px);
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(18, 19, 15, 0.84);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-timeline__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .tl-node {
    padding-left: 0;
    padding-top: 30px;
    padding-right: 8px;
    min-height: 0;
  }

  .page-about .tl-node::before {
    top: 7px;
    bottom: auto;
    left: 8px;
    right: -14px;
    border-left: 0;
    border-top: 2px dashed var(--about-line-cyan);
  }

  .page-about .tl-node:last-child::before {
    display: block;
    right: 0;
  }

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

@media (min-width: 860px) {
  .page-about .chapter-block__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(26px, 4vw, 58px);
  }

  .page-about .chapter-block__rail {
    position: sticky;
    top: clamp(56px, 10vh, 96px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(28px, 4vw, 60px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__media .media-frame {
    transform: none;
  }

  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .page-about .tl-node__dot {
    transition: none;
  }
}