.page-about {
  --about-side-w: 250px;
  --about-gap: 56px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 44px 0 56px;
  background:
    radial-gradient(120% 92% at 88% 0%, rgba(214, 162, 74, 0.18) 0%, rgba(214, 162, 74, 0) 58%),
    linear-gradient(158deg, var(--c-deep) 0%, var(--c-night) 100%);
  color: #FFFFFF;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 72px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.58);
  margin-bottom: 22px;
}

.page-about .breadcrumb__item {
  color: rgba(255, 255, 255, 0.58);
  text-decoration: none;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(255, 255, 255, 0.32);
}

.page-about .breadcrumb a.breadcrumb__item {
  color: rgba(255, 255, 255, 0.8);
  border-bottom: 1px solid transparent;
  transition: border-color 180ms ease, color 180ms ease;
}

.page-about .breadcrumb a.breadcrumb__item:hover {
  color: var(--c-gold-soft);
  border-bottom-color: var(--c-gold);
}

.page-about .about-hero .eyebrow {
  margin: 0;
  color: var(--c-gold);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: 29px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: #FFFFFF;
  max-width: 20ch;
}

.page-about .about-hero .lead {
  margin: 22px 0 0;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.84);
}

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

.page-about .hero-gauge {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 10px;
  align-items: end;
  height: 160px;
}

.page-about .hero-gauge span {
  display: block;
  border-radius: 2px 2px 0 0;
  background: linear-gradient(180deg, var(--c-gold) 0%, rgba(214, 162, 74, 0.12) 100%);
}

.page-about .hero-gauge span:nth-child(1) { height: 30%; }
.page-about .hero-gauge span:nth-child(2) { height: 54%; }
.page-about .hero-gauge span:nth-child(3) { height: 42%; }
.page-about .hero-gauge span:nth-child(4) { height: 78%; }
.page-about .hero-gauge span:nth-child(5) { height: 62%; }

.page-about .hero-gauge__caption {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-gold-soft);
}

/* ---------- 年份刻度带 ---------- */
.page-about .scale-band {
  background: var(--c-gold-soft);
  border-top: 1px solid rgba(14, 42, 74, 0.12);
  border-bottom: 1px solid rgba(14, 42, 74, 0.12);
  padding: 26px 0;
}

.page-about .year-scale {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .year-scale__item {
  display: grid;
  gap: 4px;
}

.page-about .year-scale__dot {
  display: block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-deep);
  margin-bottom: 6px;
}

.page-about .year-scale__year {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-deep);
  letter-spacing: -0.01em;
}

.page-about .year-scale__desc {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-ink);
}

/* ---------- 档案双栏 ---------- */
.page-about .dossier {
  display: grid;
  gap: 40px;
}

.page-about .side-stack {
  display: grid;
  gap: 14px;
}

.page-about .about-stat {
  padding: 20px 20px 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-gold);
  border-radius: var(--radius);
  transition: transform 200ms ease, border-color 200ms ease;
}

.page-about .about-stat:hover {
  transform: translateY(-4px);
  border-color: var(--c-gold);
}

.page-about .about-stat__value {
  display: inline-block;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-deep);
}

.page-about .about-stat__unit {
  display: inline-block;
  margin-left: 6px;
  font-size: 14px;
  color: var(--c-gray);
}

.page-about .about-stat__label {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-stat__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-gray);
}

/* ---------- 章节通用 ---------- */
.page-about .chapter + .chapter {
  margin-top: 60px;
  padding-top: 52px;
  border-top: 1px solid var(--c-line);
}

.page-about .chapter__copy p {
  margin: 20px 0 0;
  max-width: 66ch;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .chapter__copy a {
  color: var(--c-deep);
  border-bottom: 1px solid var(--c-gold);
  text-decoration: none;
  transition: background-color 180ms ease;
}

.page-about .chapter__copy a:hover {
  background-color: var(--c-gold-soft);
}

.page-about .chapter .media-frame {
  margin: 32px 0 0;
}

/* ---------- 沿革节点 ---------- */
.page-about .mile-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 26px;
  border-left: 2px solid var(--c-line);
}

.page-about .mile {
  position: relative;
  padding: 16px 0 18px;
}

.page-about .mile + .mile {
  border-top: 1px solid var(--c-line);
}

.page-about .mile::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px var(--c-cream);
}

.page-about .mile__tag {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 2px;
  background: var(--c-gold-soft);
  color: var(--c-deep);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .mile__text {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-ink);
  max-width: 64ch;
}

/* ---------- 团队职责 ---------- */
.page-about .duty-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .duty {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  column-gap: 16px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .duty:first-child {
  border-top: 1px solid var(--c-line);
}

.page-about .duty__num {
  grid-column: 1;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-gold);
  letter-spacing: -0.02em;
}

.page-about .duty__title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .duty__text {
  grid-column: 2;
  margin: 10px 0 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-gray);
}

/* ---------- 维护节奏 ---------- */
.page-about .cycle-list {
  margin-top: 28px;
  display: grid;
  gap: 14px;
}

.page-about .cycle {
  padding: 20px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  transition: transform 200ms ease, border-color 200ms ease;
}

.page-about .cycle:hover {
  transform: translateY(-4px);
  border-color: var(--c-gold);
}

.page-about .cycle__freq {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 2px;
  background: var(--c-gold-soft);
  color: var(--c-deep);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .cycle__title {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .cycle__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-gray);
}

.page-about .cycle__text a {
  color: var(--c-deep);
  border-bottom: 1px solid var(--c-gold);
  text-decoration: none;
}

.page-about .cycle__text a:hover {
  background-color: var(--c-gold-soft);
}

/* ---------- 覆盖与响应 ---------- */
.page-about .cover-grid {
  margin-top: 28px;
  display: grid;
  gap: 14px;
}

.page-about .cover-card {
  padding: 22px 20px;
  background: var(--c-cream);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.page-about .cover-card__figure {
  margin: 0;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-gray);
}

.page-about .cover-card__figure .mono {
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--c-deep);
  margin-right: 4px;
}

.page-about .cover-card__title {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-deep);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .cover-card__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-gray);
}

/* ---------- 协作分工 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .partner {
  padding: 20px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .partner:first-child {
  border-top: 1px solid var(--c-line);
}

.page-about .partner__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-deep);
}

.page-about .partner__text {
  margin: 8px 0 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-gray);
}

/* ---------- 结尾引导 ---------- */
.page-about .next-band {
  display: grid;
  gap: 22px;
  padding: 30px 24px;
  background: var(--c-night);
  border-left: 6px solid var(--c-gold);
  border-radius: var(--radius);
}

.page-about .next-band__text {
  margin: 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
  color: #FFFFFF;
}

.page-about .next-band__fine {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.62);
}

.page-about .next-band__fine a {
  color: var(--c-gold-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(214, 162, 74, 0.6);
}

.page-about .next-band__fine a:hover {
  color: #FFFFFF;
}

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

.page-about .next-band .btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.42);
  color: #FFFFFF;
}

.page-about .next-band .btn--ghost:hover {
  border-color: var(--c-gold);
  color: var(--c-gold-soft);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .cover-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .year-scale {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 56px 0 64px;
  }

  .page-about .about-hero h1 {
    font-size: 38px;
  }

  .page-about .about-hero .lead {
    font-size: 17px;
  }

  .page-about .year-scale {
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    grid-template-columns: none;
    column-gap: 0;
  }

  .page-about .year-scale__item {
    position: relative;
    padding-right: 24px;
  }

  .page-about .year-scale__item::after {
    content: "";
    position: absolute;
    left: 14px;
    right: 0;
    top: 4px;
    height: 1px;
    background: rgba(14, 42, 74, 0.24);
  }

  .page-about .year-scale__item:last-child {
    padding-right: 0;
  }

  .page-about .year-scale__item:last-child::after {
    display: none;
  }

  .page-about .cycle-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .partner {
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    column-gap: 24px;
    align-items: start;
  }

  .page-about .partner__text {
    margin-top: 0;
  }

  .page-about .next-band {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 34px 36px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: var(--about-gap);
    align-items: end;
  }

  .page-about .about-hero__visual {
    display: block;
    padding: 24px;
    border: 1px solid rgba(214, 162, 74, 0.34);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.04);
  }

  .page-about .dossier {
    grid-template-columns: var(--about-side-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .dossier__side {
    position: sticky;
    top: 88px;
  }

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

@media (min-width: 1200px) {
  .page-about .about-hero h1 {
    font-size: 44px;
  }

  .page-about .dossier {
    --about-side-w: 268px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat,
  .page-about .cycle,
  .page-about .breadcrumb a.breadcrumb__item {
    transition: none;
  }

  .page-about .about-stat:hover,
  .page-about .cycle:hover {
    transform: none;
  }
}