.page-about {
  --about-pad: clamp(1.75rem, 3.5vw, 3rem);
  --about-rail: 15rem;
  background: var(--ink-900);
  color: var(--snow);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .inline-link {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(125, 240, 190, 0.38);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(7rem, 17vw, 10rem) var(--edge) clamp(3rem, 8vw, 5.25rem);
  background: linear-gradient(168deg, var(--ink-800) 0%, var(--ink-900) 64%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  left: -10%;
  z-index: 1;
  width: min(780px, 92vw);
  height: min(540px, 68vw);
  background: linear-gradient(148deg, rgba(125, 240, 190, 0.22), rgba(53, 185, 224, 0.08) 58%, transparent 82%);
  clip-path: polygon(0 0, 100% 6%, 86% 100%, 4% 84%);
  pointer-events: none;
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
  opacity: 0.34;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, rgba(6, 18, 13, 0.94) 4%, rgba(6, 18, 13, 0.66) 48%, rgba(6, 18, 13, 0.92) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  max-width: 60rem;
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero__title {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7.4vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--snow);
  text-shadow: 0 22px 44px rgba(0, 0, 0, 0.6);
}

.page-about .about-hero__lede {
  max-width: 42rem;
  margin: 0;
  font-size: clamp(1rem, 2.6vw, 1.125rem);
  line-height: 1.9;
  color: rgba(233, 244, 238, 0.84);
}

.page-about .about-hero__meta {
  display: inline-block;
  margin: 1.75rem 0 0;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: var(--r-cut-sm);
  background: rgba(13, 33, 24, 0.72);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- 主容器与侧栏 ---------- */

.page-about .about-shell {
  max-width: 1240px;
  margin-inline: auto;
  padding: clamp(2.5rem, 7vw, 4.75rem) var(--edge) clamp(3rem, 9vw, 6rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3rem);
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .rail__list {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .rail__link {
  display: block;
  padding: 0.5rem 0.8rem;
  border: 1px solid transparent;
  border-radius: var(--r-cut-sm);
  font-size: 0.875rem;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-about .rail__link:hover,
.page-about .rail__link:focus-visible {
  color: var(--snow);
  border-color: var(--line);
}

.page-about .rail__link.is-active {
  color: var(--ink-900);
  background: var(--mint);
  border-color: var(--mint);
  font-weight: 600;
}

.page-about .rail__season {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.15rem 0.5rem;
  align-items: center;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--r-cut-sm);
  background: var(--ink-800);
}

.page-about .rail__season .pulse-dot {
  grid-row: span 2;
}

.page-about .rail__season-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .rail__season-value {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .rail__season-note {
  grid-column: 1 / -1;
  margin-top: 0.4rem;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 正文时间轴骨架 ---------- */

.page-about .about-body {
  position: relative;
  min-width: 0;
}

.page-about .story-section {
  padding-block: clamp(2.25rem, 5.5vw, 3.75rem);
}

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

.page-about .story-section + .story-section {
  border-top: 1px solid var(--line-soft);
}

.page-about .story-head {
  position: relative;
  margin-bottom: 1.35rem;
}

.page-about .story-kicker {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-about .story-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 750;
  font-size: clamp(1.5rem, 4.4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--snow);
}

.page-about .prose p {
  max-width: 38rem;
  margin: 0 0 1.1rem;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: rgba(233, 244, 238, 0.84);
}

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

.page-about .prose--lead {
  max-width: 38rem;
  margin: 0 0 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .story-foot {
  max-width: 38rem;
  margin: 1.6rem 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .pullquote {
  max-width: 34rem;
  margin: 2rem 0;
  padding: 0.3rem 0 0.3rem 1.25rem;
  border-left: 3px solid var(--violet);
  font-family: var(--font-editorial);
  font-size: clamp(1.2rem, 3.4vw, 1.6rem);
  line-height: 1.75;
  color: var(--snow);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 1.9rem 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  border-radius: var(--r-cut);
  object-fit: cover;
  background: linear-gradient(160deg, var(--ink-700), var(--ink-900));
}

.page-about .about-figure--band img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure figcaption {
  margin-top: 0.8rem;
  max-width: 38rem;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */

.page-about .tl-bar {
  margin: 0 0 1.75rem;
}

.page-about .tl-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-track {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.55rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .tl-item__mark {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-item--current .tl-year {
  color: var(--mint);
}

.page-about .tl-ver {
  display: inline-block;
  padding: 0.14rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-item__body h3 {
  margin: 0 0 0.4rem;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--snow);
}

.page-about .tl-item__body p {
  max-width: 36rem;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(233, 244, 238, 0.76);
}

/* ---------- 校对流程 ---------- */

.page-about .review-flow {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.75rem 0 0;
}

.page-about .review-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--line-soft);
  border-left-width: 3px;
  border-radius: var(--r-cut-sm);
  background: var(--ink-800);
}

.page-about .review-step:nth-child(1) {
  border-left-color: var(--mint);
}

.page-about .review-step:nth-child(2) {
  border-left-color: var(--cyan);
}

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

.page-about .review-step__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.15rem;
  padding: 0.2rem 0.4rem;
  border: 1px solid var(--line);
  border-radius: 8px 2px 8px 2px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--snow);
  font-variant-numeric: tabular-nums;
}

.page-about .review-step h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--snow);
}

.page-about .review-step p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.82;
  color: rgba(233, 244, 238, 0.76);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 1rem;
  margin: 1.6rem 0 1.9rem;
}

.page-about .team-role {
  padding: 1.25rem 1.15rem 1.35rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-cut);
  background: linear-gradient(158deg, var(--ink-700), var(--ink-800));
}

.page-about .team-role__count {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .team-role h3 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--snow);
}

.page-about .team-role p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.82;
  color: rgba(233, 244, 238, 0.74);
}

/* ---------- 里程碑清单 ---------- */

.page-about .ms-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ms-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ms-list .ms-item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ms-item__num {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .ms-item__text {
  font-size: 0.9375rem;
  line-height: 1.82;
  color: rgba(233, 244, 238, 0.79);
}

/* ---------- 服务范围 ---------- */

.page-about .scope-panel {
  margin-top: 1.6rem;
  padding: clamp(1.15rem, 4vw, 1.9rem);
  border: 1px solid var(--line);
  border-radius: var(--r-cut);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(53, 185, 224, 0.14), transparent 56%),
    var(--ink-800);
}

.page-about .scope-item {
  display: grid;
  gap: 0.3rem;
  padding: 0.85rem 0;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .scope-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .scope-item__key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .scope-item__val {
  max-width: 40rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(233, 244, 238, 0.86);
}

/* ---------- 断点 ---------- */

@media (min-width: 700px) {
  .page-about .ms-item {
    grid-template-columns: 8rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .team-grid {
    grid-template-columns: 1.15fr 0.95fr 0.9fr;
  }
}

@media (min-width: 760px) {
  .page-about .tl-item {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1.75rem;
    align-items: start;
  }

  .page-about .tl-item__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 5.5rem;
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
    padding-top: 0;
    border-top: 0;
  }

  .page-about .rail__list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail__link {
    padding: 0.5rem 0.85rem;
    border-radius: 4px 12px 4px 12px;
  }

  .page-about .about-body::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.4rem;
    bottom: 0.4rem;
    width: 1px;
    background: linear-gradient(180deg, var(--mint), var(--violet) 52%, var(--amber));
    opacity: 0.42;
  }

  .page-about .about-body > * {
    padding-left: var(--about-pad);
  }

  .page-about .story-head::before {
    content: "";
    position: absolute;
    left: calc(-1 * var(--about-pad) - 3px);
    top: 0.62rem;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--mint);
    box-shadow: 0 0 0 4px rgba(125, 240, 190, 0.12);
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 34rem;
  }

  .page-about .tl-track {
    gap: 1.45rem;
  }
}