.page-about {
  --about-sticky-top: 6rem;
  --about-ink-veil: rgba(11, 27, 43, 0.72);
}

.page-about .breadcrumbs {
  margin-top: var(--sp-5);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: var(--sp-6) 0 var(--sp-8);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(112deg, transparent 38%, rgba(226, 161, 60, 0.08) 52%, transparent 66%),
    radial-gradient(64% 110% at 100% 0%, rgba(63, 91, 87, 0.34), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .title-xl {
  max-width: 18ch;
  margin: var(--sp-3) 0 0;
  text-wrap: balance;
}

.page-about .about-hero__line {
  display: block;
  color: var(--amber-soft);
}

.page-about .about-hero .lede {
  max-width: 62ch;
  margin-top: var(--sp-5);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  list-style: none;
  margin: var(--sp-7) 0 0;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-3);
  background: var(--ink);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-stat__label {
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 主体双栏 ---------- */

.page-about .about-body {
  padding-top: var(--sp-7);
  row-gap: var(--sp-8);
  align-items: start;
}

.page-about .about-main {
  grid-column: 1 / -1;
  min-width: 0;
}

.page-about .about-side {
  grid-column: 1 / -1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  padding-bottom: var(--sp-7);
}

.page-about .about-section + .about-section {
  margin-top: var(--sp-7);
  padding-top: var(--sp-7);
  border-top: 1px solid var(--line);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.page-about .about-section__head .index-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-section__head .title-lg {
  margin: 0;
  font-size: clamp(1.375rem, 4.6vw, 2rem);
  line-height: 1.3;
  letter-spacing: 0.02em;
  text-wrap: balance;
}

.page-about .about-section .prose {
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-section .prose p {
  margin: 0 0 1.1em;
}

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

/* ---------- 岗位清单 ---------- */

.page-about .role-list {
  list-style: none;
  margin: var(--sp-5) 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .role-item {
  display: grid;
  gap: var(--sp-2);
  padding: var(--sp-4);
  background: var(--panel);
}

.page-about .role-item__key {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--amber-soft);
}

.page-about .role-item__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: var(--sp-6) 0 0;
}

.page-about .about-figure .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(6, 18, 28, 0.45);
}

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

.page-about .about-figure figcaption {
  margin-top: var(--sp-3);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  line-height: 1.6;
}

.page-about .about-figure--band {
  margin: var(--sp-5) 0 var(--sp-6);
}

/* ---------- 阶梯流程 ---------- */

.page-about .review-steps {
  list-style: none;
  margin: var(--sp-6) 0 0;
  padding: 0;
  counter-reset: review;
}

.page-about .review-step {
  position: relative;
  padding: 0 0 var(--sp-6) 2.5rem;
  outline: none;
}

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

.page-about .review-step__dot {
  position: absolute;
  left: 0;
  top: 0.4rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--archive);
  border: 1px solid var(--amber-soft);
  transition: transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .review-step::after {
  content: "";
  position: absolute;
  left: 0.3125rem;
  top: 1.6rem;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--line), rgba(46, 62, 74, 0.2));
}

.page-about .review-step:last-child::after {
  display: none;
}

.page-about .review-step:hover .review-step__dot,
.page-about .review-step:focus-within .review-step__dot {
  transform: scale(1.35);
  background: var(--amber);
}

.page-about .review-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .review-step__title {
  margin: var(--sp-2) 0 var(--sp-2);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .review-step__lead {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .review-step__note {
  margin: var(--sp-2) 0 0;
  padding-left: var(--sp-3);
  border-left: 2px solid var(--archive);
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--mist);
  overflow: hidden;
  max-height: 12rem;
  opacity: 1;
  transition: max-height 0.32s var(--ease), opacity 0.32s var(--ease);
}

@media (min-width: 700px) {
  .page-about .review-step:nth-child(2) {
    padding-left: 4rem;
  }
  .page-about .review-step:nth-child(3) {
    padding-left: 5.5rem;
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .review-step__note {
    max-height: 0;
    opacity: 0;
  }
  .page-about .review-step:hover .review-step__note,
  .page-about .review-step:focus-within .review-step__note {
    max-height: 12rem;
    opacity: 1;
  }
}

/* ---------- 分区说明 ---------- */

.page-about .split-list {
  margin: var(--sp-5) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-3);
}

.page-about .split-item {
  display: grid;
  gap: var(--sp-1);
  padding: var(--sp-3) 0 var(--sp-3) var(--sp-4);
  border-left: 2px solid var(--line);
}

.page-about .split-item dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--amber-soft);
}

.page-about .split-item dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 合作面板 ---------- */

.page-about .partner-panel {
  position: relative;
  margin-top: var(--sp-5);
  padding: var(--sp-5) var(--sp-4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}

.page-about .partner-panel__media {
  position: absolute;
  inset: 0;
  opacity: 0.22;
  pointer-events: none;
}

.page-about .partner-panel__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

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

.page-about .partner-panel__text p {
  margin: 0 0 1em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--paper);
}

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

.page-about .metric-strip {
  list-style: none;
  margin: var(--sp-5) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4) var(--sp-3);
}

.page-about .metric {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--line);
}

.page-about .metric__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .metric__label {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-note {
  margin: var(--sp-5) 0 0;
  padding: var(--sp-4);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cinnabar);
  border-radius: var(--radius);
  background: var(--ink-deep);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 横向刻度条 ---------- */

.page-about .timeline {
  list-style: none;
  margin: var(--sp-5) 0 0;
  padding: 0 0 var(--sp-3);
  display: flex;
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  border-bottom: 1px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  flex: 0 0 min(68vw, 15rem);
  padding: var(--sp-5) var(--sp-4) 0 0;
  scroll-snap-align: start;
}

.page-about .timeline__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .timeline__line {
  display: block;
  width: 100%;
  height: 1px;
  margin: var(--sp-2) 0 var(--sp-3);
  background: var(--line);
  position: relative;
}

.page-about .timeline__line::before {
  content: "";
  position: absolute;
  left: 0;
  top: -3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--archive);
  border: 1px solid var(--amber-soft);
}

.page-about .timeline__title {
  margin: 0 0 var(--sp-2);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--amber-soft);
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  margin-top: var(--sp-7);
  padding: var(--sp-6) var(--sp-5);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-deep);
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-cta .title-md {
  margin: var(--sp-2) 0 var(--sp-3);
  font-size: clamp(1.25rem, 4.4vw, 1.75rem);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-cta .muted {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 46ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

/* ---------- 侧栏 ---------- */

.page-about .about-index,
.page-about .about-side-card {
  padding: var(--sp-4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 2px 8px rgba(6, 18, 28, 0.4);
}

.page-about .about-index .eyebrow,
.page-about .about-side-card .eyebrow {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
}

.page-about .about-index__list li {
  background: var(--panel);
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-2);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.875rem;
  border-left: 2px solid transparent;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .about-index__list a .index-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-left-color: var(--amber);
  background: var(--ink);
  color: var(--amber-soft);
  outline: none;
}

.page-about .about-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-links a {
  display: block;
  padding: var(--sp-2) 0 var(--sp-2) var(--sp-3);
  border-left: 1px solid var(--line);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  border-left-color: var(--amber);
  color: var(--amber-soft);
  outline: none;
}

.page-about .about-side-card--quiet {
  background: transparent;
  box-shadow: none;
}

.page-about .about-side-card__text {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 中等屏 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero {
    padding-top: var(--sp-7);
  }

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

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

  .page-about .split-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--sp-4);
  }

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

  .page-about .partner-panel {
    padding: var(--sp-6);
  }

  .page-about .timeline__item {
    flex: 1 0 12rem;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: var(--sp-7) var(--sp-6);
  }
}

/* ---------- 桌面双栏 ---------- */

@media (min-width: 1024px) {
  .page-about .about-main {
    grid-column: 1 / span 7;
  }

  .page-about .about-side {
    grid-column: 9 / span 4;
    position: sticky;
    top: var(--about-sticky-top);
  }

  .page-about .about-hero .lede {
    font-size: 1.0625rem;
  }

  .page-about .about-section .prose {
    font-size: 1.0625rem;
  }

  .page-about .about-hero::before {
    background:
      linear-gradient(112deg, transparent 40%, rgba(226, 161, 60, 0.1) 53%, transparent 68%),
      radial-gradient(52% 120% at 96% 0%, rgba(63, 91, 87, 0.4), transparent 74%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .review-step__dot,
  .page-about .review-step__note,
  .page-about .about-index__list a,
  .page-about .about-links a {
    transition-duration: 0.12s;
  }

  .page-about .review-step:hover .review-step__dot,
  .page-about .review-step:focus-within .review-step__dot {
    transform: none;
  }

  .page-about .timeline {
    scroll-snap-type: none;
  }
}

@media print {
  .page-about .about-side,
  .page-about .about-cta__actions {
    display: none;
  }

  .page-about .about-main {
    grid-column: 1 / -1;
  }

  .page-about .about-section {
    break-inside: avoid;
  }
}
<<<END>>>