.page-about {
  --about-rail: 104px;
  --about-measure: 600px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 40px) 0 64px;
  background:
    radial-gradient(circle at 88% 10%, rgba(217, 162, 74, 0.22), transparent 46%),
    linear-gradient(168deg, var(--deep) 0%, var(--deep-2) 64%, #0d3450 100%);
  color: var(--warm);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(255, 251, 243, 0.16) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: 0.55;
  -webkit-mask-image: linear-gradient(200deg, rgba(0, 0, 0, 0.9), transparent 72%);
  mask-image: linear-gradient(200deg, rgba(0, 0, 0, 0.9), transparent 72%);
}
.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
}
.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(240, 217, 168, 0.78);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  color: rgba(240, 217, 168, 0.42);
}
.page-about .breadcrumb a {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: currentColor;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--warm);
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}
.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: clamp(28px, 7.2vw, 54px);
  line-height: 1.24;
  margin: 0 0 20px;
  max-width: 13.5em;
  color: var(--warm);
}
.page-about .lede {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.88);
}
.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}
.page-about .hero-facts li {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--gold-soft);
  border: 1px solid rgba(240, 217, 168, 0.34);
  border-radius: var(--pill);
  padding: 6px 14px;
}

/* ---------- 首屏横带图 ---------- */
.page-about .about-band {
  margin: 0;
  padding: 0;
  border-radius: 0;
  background: linear-gradient(120deg, var(--deep), var(--deep-2) 70%, var(--indigo));
}
.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  max-width: 100%;
}
.page-about .about-band figcaption {
  margin: 0;
  padding: 12px 20px 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.03em;
  line-height: 1.7;
  color: var(--gold-soft);
}

/* ---------- 主体布局 ---------- */
.page-about .about-body {
  padding: 44px 0 76px;
}
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}
.page-about .about-article {
  max-width: var(--about-measure);
  min-width: 0;
}

/* ---------- 左侧小节索引 ---------- */
.page-about .about-rail ol {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}
.page-about .about-rail a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border-radius: var(--pill);
  border: 1px solid rgba(90, 107, 122, 0.32);
  background: var(--warm);
  color: var(--slate);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  white-space: nowrap;
  transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}
.page-about .about-rail .rail-num {
  color: var(--gold);
  letter-spacing: 0.06em;
}
.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible {
  border-color: var(--gold);
  color: var(--deep);
}
.page-about .about-rail a[aria-current="true"] {
  border-color: var(--gold);
  background: rgba(217, 162, 74, 0.16);
  color: var(--deep);
}

/* ---------- 小节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding: 0 0 40px;
  margin: 0 0 40px;
  border-bottom: 1px solid rgba(90, 107, 122, 0.24);
}
.page-about .about-sec:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-sec::after {
  content: "";
  position: absolute;
  left: -14px;
  right: -14px;
  top: -14px;
  bottom: 18px;
  border-radius: var(--radius-md);
  background: linear-gradient(96deg, rgba(143, 189, 180, 0.2), rgba(143, 189, 180, 0) 74%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: -1;
}
.page-about .about-sec:hover::after {
  opacity: 1;
}
.page-about .about-sec--mist {
  padding: 26px 18px 30px;
  margin-left: -18px;
  margin-right: -18px;
  border-bottom: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(143, 189, 180, 0.22), rgba(143, 189, 180, 0.05));
}
.page-about .about-sec--mist::after {
  left: -6px;
  right: -6px;
}

.page-about .sec-head {
  margin: 0 0 18px;
}
.page-about .sec-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--gold);
}
.page-about .sec-title {
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: clamp(24px, 5.6vw, 34px);
  line-height: 1.3;
  color: var(--deep);
}
.page-about .sec-copy p {
  margin: 0 0 16px;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--ink);
}
.page-about .sec-copy > p:last-child {
  margin-bottom: 0;
}
.page-about .sec-copy h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: var(--fs-21);
  line-height: 1.45;
  margin: 0 0 6px;
  color: var(--deep);
}
.page-about .mono-num {
  font-family: var(--font-mono);
  font-size: 0.88em;
  letter-spacing: 0.02em;
  color: var(--deep);
  background: rgba(217, 162, 74, 0.18);
  border-radius: 6px;
  padding: 1px 6px;
}
.page-about .dropcap::first-letter {
  float: left;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 3.1em;
  line-height: 0.92;
  margin: 0.06em 10px 0 0;
  color: var(--wine);
}

/* ---------- 三条原则 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about .principle-list li {
  position: relative;
  padding-left: 40px;
}
.page-about .principle-list .p-num {
  position: absolute;
  left: 0;
  top: 3px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.05em;
  color: var(--coral);
}
.page-about .principle-list strong {
  display: block;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: var(--fs-21);
  line-height: 1.4;
  color: var(--deep);
  margin-bottom: 4px;
}
.page-about .principle-list p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 分区：左文右图 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.page-about .sec-figure {
  margin: 0;
  outline: none;
  border-radius: var(--radius-md);
  transition: box-shadow 0.3s ease;
}
.page-about .sec-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-md);
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.page-about .sec-figure figcaption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--slate);
}
.page-about .sec-figure:focus {
  box-shadow: 0 0 0 3px var(--coral);
}
.page-about .sec-figure:focus img {
  transform: scale(1.03);
}

/* ---------- 岗位名册 ---------- */
.page-about .roster {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}
.page-about .roster li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  padding: 16px 0;
  border-bottom: 1px dashed rgba(90, 107, 122, 0.32);
}
.page-about .roster li:last-child {
  border-bottom: 0;
}
.page-about .r-count {
  justify-self: start;
  align-self: start;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.02em;
  border-radius: var(--pill);
  padding: 3px 12px;
  white-space: nowrap;
}
.page-about .r-count--gold {
  background: var(--gold);
  color: #33260a;
}
.page-about .r-count--mist {
  background: var(--mist);
  color: var(--deep);
}
.page-about .r-count--indigo {
  background: var(--indigo);
  color: var(--warm);
}
.page-about .r-count--coral {
  background: var(--coral);
  color: #2b1004;
  font-weight: 700;
}
.page-about .r-body p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 三审步骤 ---------- */
.page-about .review-steps {
  list-style: none;
  margin: 22px 0 20px;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .review-steps li {
  position: relative;
  padding: 16px 18px 16px 56px;
  background: var(--warm);
  border: 1px solid rgba(143, 189, 180, 0.55);
  border-radius: var(--radius-md);
}
.page-about .review-steps .step-num {
  position: absolute;
  left: 18px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--indigo);
}
.page-about .review-steps h3 {
  margin: 0 0 4px;
  font-size: var(--fs-17);
}
.page-about .review-steps p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--slate);
}
.page-about .sec-note {
  margin: 0;
  padding: 12px 0 12px 16px;
  border-left: 5px solid var(--coral);
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold), var(--mist) 58%, var(--indigo));
}
.page-about .about-timeline li {
  position: relative;
  padding: 0 0 26px 16px;
}
.page-about .about-timeline li:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--slate);
  transition: background 0.5s ease, border-color 0.5s ease, box-shadow 0.5s ease;
}
.page-about .about-timeline li.is-revealed::before {
  background: var(--gold);
  border-color: var(--deep);
  box-shadow: 0 0 0 4px rgba(217, 162, 74, 0.22);
}
.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.08em;
  color: var(--wine);
  margin-bottom: 2px;
}
.page-about .about-timeline h3 {
  font-size: var(--fs-21);
  margin: 0 0 4px;
}
.page-about .about-timeline p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.82;
  color: var(--slate);
}

/* ---------- 协作与来源 ---------- */
.page-about .collab-grid {
  display: grid;
  gap: 16px;
  margin-top: 4px;
}
.page-about .collab {
  padding: 20px 20px 18px;
  background: var(--warm);
  border-radius: var(--radius-md);
  border-top: 4px solid var(--slate);
}
.page-about .collab--proof {
  border-top-color: var(--indigo);
}
.page-about .collab--image {
  border-top-color: var(--wine);
}
.page-about .collab h3 {
  font-size: var(--fs-21);
  margin: 0 0 8px;
}
.page-about .collab p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.82;
  color: var(--slate);
}

/* ---------- 页面分工入口 ---------- */
.page-about .about-links {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-links a {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 14px;
  padding: 14px 20px;
  border-radius: var(--pill);
  border: 1px solid rgba(90, 107, 122, 0.3);
  background: var(--warm);
  color: var(--deep);
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  border-color: var(--gold);
  background: rgba(217, 162, 74, 0.14);
}
.page-about .lk-num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--slate);
  font-weight: 400;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .collab-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-sec--mist {
    padding: 30px 26px 34px;
    margin-left: -26px;
    margin-right: -26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 30px;
    align-items: start;
  }
  .page-about .about-split--rev {
    grid-template-columns: 0.92fr 1.08fr;
  }
  .page-about .roster li {
    grid-template-columns: 84px minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 56px) 0 84px;
  }
  .page-about .about-body {
    padding: 60px 0 96px;
  }
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
  .page-about .about-rail ol {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 0;
    border-left: 1px solid rgba(90, 107, 122, 0.28);
  }
  .page-about .about-rail a {
    position: relative;
    border: 0;
    border-radius: 0 10px 10px 0;
    background: transparent;
    padding: 10px 10px 10px 14px;
    font-family: var(--font-body);
    font-size: var(--fs-14);
    white-space: normal;
  }
  .page-about .about-rail a[aria-current="true"] {
    background: rgba(217, 162, 74, 0.16);
  }
  .page-about .about-rail a[aria-current="true"]::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 9px;
    bottom: 9px;
    width: 3px;
    border-radius: 2px;
    background: var(--gold);
  }
  .page-about .about-rail .rail-num {
    font-family: var(--font-mono);
    font-size: var(--fs-12);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}