.page-about {
  --about-pad: 56px;
  --about-axis: 19px;
  display: block;
  background-color: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: 36px;
  background-color: var(--ink);
  background-image: radial-gradient(120% 78% at 82% 0%, rgba(30, 122, 85, 0.22), transparent 62%);
}

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 20px 0 12px;
  color: var(--silver);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 6vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  max-width: 20em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.85;
  margin: 0;
  max-width: 44em;
  color: rgba(244, 239, 228, 0.84);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 30px;
  padding-bottom: 56px;
}

.page-about .about-hero__media {
  border: 1px solid var(--glass-line);
  border-top: 3px solid var(--green);
  border-radius: var(--r);
  overflow: hidden;
  margin: 0;
  background-color: var(--ink-deep);
}

.page-about .about-hero__media .picture__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .about-hero__media .picture__cap {
  display: block;
  padding: 12px 16px 14px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-hero__note {
  margin: 0;
}

.page-about .about-hero__note .plaque__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.24;
  margin: 10px 0 12px;
}

.page-about .about-hero__note .plaque__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 纵向时间轴骨架 ---------- */
.page-about .about-track {
  position: relative;
}

.page-about .about-chapter {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-chapter--ink {
  background-color: var(--ink);
  color: var(--paper);
}

.page-about .about-chapter--paper {
  background-color: var(--paper);
  color: var(--ink-text);
}

.page-about .about-chapter--stand {
  background-color: var(--blue-stand);
  color: var(--paper);
  background-image: linear-gradient(180deg, rgba(10, 20, 24, 0.35), rgba(10, 20, 24, 0.35));
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-node {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 30px;
  min-height: 22px;
}

.page-about .about-node::before {
  content: none;
  position: absolute;
  left: var(--about-axis);
  top: calc(var(--about-pad) * -1);
  bottom: calc(var(--about-pad) * -1);
  width: 1px;
  background-image: linear-gradient(180deg, transparent, rgba(201, 210, 217, 0.3) 14%, rgba(201, 210, 217, 0.3) 86%, transparent);
}

.page-about .about-chapter--paper .about-node::before {
  background-image: linear-gradient(180deg, transparent, rgba(11, 17, 20, 0.16) 14%, rgba(11, 17, 20, 0.16) 86%, transparent);
}

.page-about .about-node__dot {
  position: absolute;
  left: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--mist);
  box-shadow: 0 0 0 4px rgba(201, 210, 217, 0.1);
  transition: background-color 0.35s ease, box-shadow 0.35s ease;
}

.page-about .about-node.is-in .about-node__dot {
  background-color: var(--green-bright);
  box-shadow: 0 0 0 5px rgba(79, 208, 140, 0.18);
}

.page-about .about-node__index {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-node__year {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: inherit;
  opacity: 0.9;
}

.page-about .about-chapter--paper .about-node__index {
  color: rgba(11, 17, 20, 0.58);
}

/* ---------- 章节内容 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
}

.page-about .about-p {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 40em;
  opacity: 0.9;
}

.page-about .about-p--tail {
  margin-top: 26px;
  margin-bottom: 0;
  padding-left: 16px;
  border-left: 2px solid var(--green);
  opacity: 0.84;
}

.page-about .about-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 12px;
  max-width: 40em;
}

.page-about .about-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  opacity: 0.88;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 1px;
  background-color: var(--green-bright);
}

.page-about .about-chapter--paper .about-list li::before {
  background-color: var(--green);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0 30px;
  border-radius: var(--r);
  overflow: hidden;
  border: 1px solid var(--glass-line-soft);
  background-color: var(--ink-deep);
}

.page-about .about-chapter--paper .about-figure {
  border-color: rgba(11, 17, 20, 0.12);
  background-color: var(--paper-2);
}

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

.page-about .about-figure .picture__cap {
  display: block;
  padding: 12px 16px 14px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-chapter--paper .about-figure .picture__cap {
  color: rgba(11, 17, 20, 0.6);
}

/* ---------- 数据链路 ---------- */
.page-about .about-chain {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-chain > li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 0;
  border-top: 1px solid rgba(11, 17, 20, 0.14);
}

.page-about .about-chain > li:last-child {
  border-bottom: 1px solid rgba(11, 17, 20, 0.14);
}

.page-about .about-chain__num {
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--orange-ink);
  padding-top: 2px;
}

.page-about .about-chain__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  margin: 0 0 6px;
}

.page-about .about-chain__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  opacity: 0.86;
}

/* ---------- 排班 ---------- */
.page-about .about-shift {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 26px;
}

.page-about .shift-card {
  padding: 20px 20px 24px;
  border: 1px solid var(--glass-line);
  border-top: 3px solid var(--orange);
  border-radius: var(--r);
  background-color: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about .shift-card--silver {
  border-top-color: var(--silver);
}

.page-about .shift-card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.3;
  margin: 12px 0 10px;
  color: var(--paper);
}

.page-about .shift-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.82);
}

/* ---------- 年度节点 ---------- */
.page-about .about-years {
  list-style: none;
  padding: 0;
  margin: 26px 0 0;
}

.page-about .about-years__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(11, 17, 20, 0.14);
}

.page-about .about-years__item:first-child {
  border-top: 1px solid rgba(11, 17, 20, 0.14);
}

.page-about .about-years__year {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--orange-ink);
}

.page-about .about-years__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  margin: 0 0 6px;
  color: var(--ink-text);
}

.page-about .about-years__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  opacity: 0.86;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 22px;
}

.page-about .about-partner {
  padding: 20px;
  border: 1px solid var(--glass-line);
  border-left: 3px solid var(--green-bright);
  border-radius: var(--r);
  background-color: rgba(10, 20, 24, 0.42);
}

.page-about .about-partner[hidden] {
  display: none;
}

.page-about .about-partner__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  margin: 12px 0 8px;
  color: var(--paper);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(244, 239, 228, 0.82);
}

.page-about .about-assure {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--glass-line);
}

.page-about .about-assure__item {
  display: grid;
  gap: 6px;
}

.page-about .about-assure__num {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--green-bright);
}

.page-about .about-assure__cap {
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 规模 ---------- */
.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
  margin-top: 26px;
}

.page-about .about-scale__item {
  min-width: 0;
}

.page-about .about-scale__num {
  display: block;
  font-size: clamp(26px, 5.2vw, 44px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-text);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--silver);
}

.page-about .about-scale__cap {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(11, 17, 20, 0.7);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  background-color: var(--ink);
  background-image: linear-gradient(120deg, rgba(255, 90, 43, 0.14), transparent 58%);
  padding: 54px 0 62px;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.14;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-next__lead {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.8;
  max-width: 38em;
  color: rgba(244, 239, 228, 0.8);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-shift {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

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

  .page-about .about-assure {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-years__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-pad: 80px;
  }

  .page-about .about-hero {
    padding-top: 48px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7.5fr) minmax(0, 4.5fr);
    gap: 44px;
    align-items: end;
    padding-bottom: 76px;
  }

  .page-about .about-hero__note {
    transform: translateY(-30px);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-node {
    align-items: flex-start;
    padding-left: 36px;
  }

  .page-about .about-node::before {
    content: "";
  }

  .page-about .about-node__dot {
    left: 14px;
    top: 8px;
    transform: none;
  }

  .page-about .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-next {
    padding: 68px 0 78px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-chapter__grid {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-chain > li {
    grid-template-columns: 56px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__dot {
    transition: none;
  }

  .page-about .about-hero__note {
    transform: none;
  }
}