.page-about {
  --about-pad: 1.25rem;
  --about-rail-w: 190px;
  background: var(--paper);
  color: var(--txt);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 1.5rem 0 3rem;
  color: var(--paper);
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(0, 216, 230, .18), transparent 62%),
    radial-gradient(90% 70% at 6% 96%, rgba(255, 122, 47, .12), transparent 66%),
    var(--space);
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(139, 244, 247, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 244, 247, .07) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(85% 75% at 72% 18%, #000 28%, transparent 86%);
  mask-image: radial-gradient(85% 75% at 72% 18%, #000 28%, transparent 86%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-crumb {
  margin-bottom: 1.75rem;
}

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
}

.page-about .about-crumb li {
  display: flex;
  align-items: center;
  gap: .4rem;
}

.page-about .about-crumb li + li::before {
  content: "/";
  color: rgba(139, 244, 247, .45);
}

.page-about .about-crumb a {
  color: var(--cyan-soft);
  text-decoration: none;
}

.page-about .about-crumb a:hover {
  text-decoration: underline;
}

.page-about .about-crumb li[aria-current] {
  color: rgba(244, 239, 230, .62);
}

.page-about .about-hero__split {
  display: grid;
  gap: 2rem;
}

.page-about .about-hero__eyebrow {
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  margin: 0 0 1rem;
}

.page-about .about-hero h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(1.9rem, 6.2vw, 3.1rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-hero__lede {
  margin: 0 0 1.75rem;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 239, 230, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-btn-ghost {
  color: var(--paper);
  border-color: rgba(139, 244, 247, .38);
}

.page-about .about-btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan-soft);
}

.page-about .about-panel {
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  padding: 1.1rem 1.15rem 1rem;
  background: linear-gradient(180deg, rgba(11, 27, 43, .86), rgba(6, 16, 32, .96));
  box-shadow: var(--shadow-2);
}

.page-about .about-panel__head {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding-bottom: .85rem;
  margin-bottom: .35rem;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-panel__title {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--cyan-soft);
}

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

.page-about .about-panel__rows li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: .62rem 0;
  border-bottom: 1px dashed rgba(139, 244, 247, .12);
}

.page-about .about-panel__rows li:last-child {
  border-bottom: 0;
}

.page-about .about-k {
  font-size: .84rem;
  color: rgba(244, 239, 230, .68);
}

.page-about .about-v {
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: .02em;
}

.page-about .about-v--mono {
  color: var(--orange);
}

.page-about .about-panel__foot {
  margin: .8rem 0 0;
  padding-top: .8rem;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: .7rem;
  line-height: 1.6;
  color: rgba(139, 244, 247, .72);
}

/* ---------- 主体骨架：左索引 + 右正文 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 1.75rem;
  padding-top: 2.25rem;
  padding-bottom: 3.5rem;
}

.page-about .about-rail__label {
  margin: 0 0 .75rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-about .about-rail__list {
  display: flex;
  gap: .5rem;
  margin: 0;
  padding: 0 0 .4rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  min-height: 48px;
  padding: .5rem .85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-3);
  color: var(--txt-soft);
  font-size: .84rem;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .about-rail__list span {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--orange);
}

.page-about .about-rail__years {
  display: none;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  scroll-margin-top: 5.5rem;
  padding: 2.25rem 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section--paper {
  margin-left: calc(var(--about-pad) * -1);
  margin-right: calc(var(--about-pad) * -1);
  padding-left: var(--about-pad);
  padding-right: var(--about-pad);
  background: var(--paper-2);
  border-top: 0;
}

.page-about .about-section__head {
  margin-bottom: 1.5rem;
}

.page-about .about-section__head .eyebrow {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-section h2 {
  margin: 0;
  font-size: clamp(1.42rem, 4vw, 2.05rem);
  line-height: 1.32;
  font-weight: 700;
  color: var(--ink);
  max-width: 22em;
}

.page-about .about-section__sub {
  margin: .85rem 0 0;
  max-width: 40em;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--txt-soft);
}

.page-about .about-section p {
  font-size: .96rem;
  line-height: 1.9;
  color: var(--txt-soft);
}

.page-about .about-section h3 {
  margin: 0 0 .5rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-cols {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-cols__main p {
  margin: 0 0 1rem;
}

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

.page-about .about-cols__aside {
  padding-left: 0;
  border-left: 0;
}

.page-about .about-aside__title {
  margin: 0 0 .75rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--slate);
  text-transform: uppercase;
}

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

.page-about .about-notes li {
  position: relative;
  padding: .6rem 0 .6rem 1.1rem;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--txt-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-notes li:last-child {
  border-bottom: 0;
}

.page-about .about-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.15rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .about-notes strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 2rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--paper-3);
  box-shadow: var(--shadow-1);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--space);
}

.page-about .about-figure figcaption {
  padding: .75rem 1rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: .6rem;
  bottom: .6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--orange), rgba(255, 122, 47, .1));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 1.9rem 2.15rem;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .3rem;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--orange);
  background: var(--paper);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, .12);
}

.page-about .about-timeline__year {
  margin: 0 0 .35rem;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 44em;
}

/* ---------- 分工 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.page-about .about-role {
  padding: 1.1rem 1.15rem;
  border-radius: var(--r);
  background: var(--paper-3);
  box-shadow: inset 0 0 0 1px var(--line-soft);
}

.page-about .about-role__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin: 0 0 .7rem;
  border: 1px solid var(--orange);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--orange);
}

.page-about .about-role p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
}

.page-about .about-figure--wide {
  margin-bottom: 0;
}

/* ---------- 场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 0;
  margin-bottom: 2rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-scene {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-scene p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.82;
}

/* ---------- 数据条 ---------- */
.page-about .about-bars {
  display: grid;
  gap: 1.1rem;
  margin-bottom: 1.1rem;
}

.page-about .about-bar__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: .45rem;
  font-size: .86rem;
  color: var(--txt-soft);
}

.page-about .about-bar__num {
  font-family: var(--font-mono);
  font-size: .98rem;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-bar__track {
  height: 6px;
  border-radius: 3px;
  background: rgba(11, 27, 43, .1);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--steel));
}

.page-about .about-bar__fill--a {
  width: 68%;
}

.page-about .about-bar__fill--b {
  width: 92%;
}

.page-about .about-bars__note {
  margin: 0 0 2rem;
  padding-left: .9rem;
  border-left: 2px solid var(--orange);
  font-size: .88rem;
  line-height: 1.85;
}

.page-about .about-section--paper .about-figure {
  margin-bottom: 0;
}

/* ---------- 荣誉 ---------- */
.page-about .about-prose {
  margin: 0 0 1.5rem;
  max-width: 46em;
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tags li {
  padding: .45rem .8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-3);
  font-family: var(--font-mono);
  font-size: .74rem;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 下一步 ---------- */
.page-about .about-cta {
  padding-bottom: 0;
}

.page-about .about-cta__text {
  margin: 0 0 1.5rem;
  max-width: 40em;
}

.page-about .about-cta__links {
  display: grid;
  gap: .6rem;
}

.page-about .about-cta__link {
  display: flex;
  align-items: center;
  gap: .7rem;
  min-height: 52px;
  padding: .8rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--paper-3);
  color: var(--ink);
  font-size: .94rem;
  text-decoration: none;
  transition: border-color .18s var(--ease), transform .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-color: var(--orange);
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
}

.page-about .about-cta__idx {
  font-family: var(--font-mono);
  font-size: .9rem;
  color: var(--orange);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about {
    --about-pad: 2rem;
  }

  .page-about .about-hero {
    padding: 2rem 0 4.5rem;
  }

  .page-about .about-hero__split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 3.5rem;
    align-items: center;
  }

  .page-about .about-hero__lede {
    font-size: 1.06rem;
  }

  .page-about .about-panel {
    padding: 1.35rem 1.4rem 1.2rem;
  }

  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 3.5rem;
    padding-top: 3.5rem;
    padding-bottom: 5rem;
  }

  .page-about .about-rail {
    position: sticky;
    top: 5.5rem;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__list a {
    min-height: 0;
    padding: .55rem 0 .55rem .85rem;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: .82rem;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--orange);
    color: var(--ink);
  }

  .page-about .about-rail__years {
    display: grid;
    gap: .35rem;
    margin-top: 1.75rem;
    padding-top: 1rem;
    border-top: 1px solid var(--line-soft);
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .1em;
    color: var(--slate);
  }

  .page-about .about-section {
    padding: 3rem 0;
  }

  .page-about .about-section:first-child {
    padding-top: 0;
  }

  .page-about .about-section--paper {
    padding-left: var(--about-pad);
    padding-right: var(--about-pad);
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
    gap: 3rem;
  }

  .page-about .about-cols__aside {
    padding-left: 1.5rem;
    border-left: 1px solid var(--line);
  }

  .page-about .about-timeline__item {
    padding-left: 2.5rem;
    padding-bottom: 2.25rem;
  }

  .page-about .about-section p {
    font-size: 1rem;
  }

  .page-about .about-scenes {
    column-gap: 3rem;
  }
}

@media (min-width: 1140px) {
  .page-about .about-hero__split {
    gap: 5rem;
  }

  .page-about .about-shell {
    gap: 4.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cta__link,
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .about-cta__link:hover,
  .page-about .about-cta__link:focus-visible {
    transform: none;
  }
}