.page-about {
  --about-edge: 2px solid var(--steel);
  display: block;
  overflow-x: hidden;
}

/* ---------- 通用段落 ---------- */
.page-about .prose {
  max-width: 72ch;
}

.page-about .section-head {
  margin-bottom: 8px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 56px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(140, 240, 90, 0.05) 0 2px,
    transparent 2px 132px
  );
}

.page-about .hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.page-about .hero-rail {
  border-left: 2px solid var(--lime);
  padding-left: 16px;
}

.page-about .rail-list {
  margin: 14px 0 0;
}

.page-about .rail-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--steel);
}

.page-about .rail-item dt {
  margin: 0;
}

.page-about .rail-item dd {
  margin: 0;
  color: var(--chalk);
  font-size: 14px;
  font-weight: 700;
}

.page-about .rail-note {
  margin: 16px 0 0;
  padding-left: 2px;
  border-left: 1px solid var(--steel-soft);
  padding-top: 2px;
  padding-bottom: 2px;
}

.page-about .hero-title {
  margin: 0 0 18px;
  font-size: clamp(30px, 7vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--chalk);
}

.page-about .hero-lead {
  margin: 0 0 16px;
  color: var(--chalk);
}

.page-about .hero-para {
  margin: 0;
  color: var(--rock);
  font-size: 15px;
}

.page-about .hero-figure {
  position: relative;
  margin: 28px 0 0;
  border: var(--about-edge);
  border-radius: var(--r);
  background: var(--stand);
  box-shadow: var(--shadow);
  overflow: hidden;
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: 52px 0 60px;
  background: var(--turf);
  border-top: var(--line);
  border-bottom: var(--line);
  overflow: hidden;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: -80px;
  left: 8%;
  width: 560px;
  height: 240px;
  pointer-events: none;
  background: radial-gradient(closest-side, rgba(140, 240, 90, 0.12), transparent 72%);
}

.page-about .about-timeline .wrap {
  position: relative;
}

.page-about .timeline-lead {
  margin: 14px 0 30px;
  color: var(--rock);
  font-size: 15px;
}

.page-about .tl {
  position: relative;
}

.page-about .tl-ruler {
  height: 20px;
  margin-bottom: 26px;
  border-bottom: 2px solid var(--steel);
  background-image: repeating-linear-gradient(
    90deg,
    var(--steel) 0 1px,
    transparent 1px 44px
  );
  background-size: 100% 9px;
  background-position: bottom left;
  background-repeat: repeat-x;
}

.page-about .tl__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-node {
  position: relative;
  padding: 30px 20px 22px;
  border: var(--about-edge);
  border-radius: var(--r);
  background: var(--stand);
  box-shadow: var(--shadow-sm);
  outline-offset: 3px;
  transition: border-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}

.page-about .tl-node__dot {
  position: absolute;
  top: 16px;
  right: 18px;
  width: 10px;
  height: 10px;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(140, 240, 90, 0.14);
}

.page-about .tl-node__ver {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .tl-node__name {
  margin: 0 0 10px;
  font-size: 20px;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--chalk);
}

.page-about .tl-node__desc {
  margin: 0;
  color: var(--rock);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .tl-node__caps {
  margin: 16px 0 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px dashed var(--steel);
  color: var(--chalk);
  font-size: 13px;
  line-height: 1.9;
}

.page-about .tl-node__caps li {
  position: relative;
  padding-left: 14px;
}

.page-about .tl-node__caps li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 5px;
  height: 5px;
  background: var(--steel);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-visible {
  border-color: var(--lime);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.page-about .tl-node:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .tl-node:hover .tl-node__caps,
.page-about .tl-node:focus-visible .tl-node__caps {
  border-top-color: var(--lime);
}

.page-about .tl-node:hover .tl-node__caps li::before,
.page-about .tl-node:focus-visible .tl-node__caps li::before {
  background: var(--lime);
}

/* ---------- 数据来源 ---------- */
.page-about .about-data {
  padding: 56px 0;
}

.page-about .data-figure {
  position: relative;
  margin: 0 0 34px;
  border: var(--about-edge);
  border-radius: var(--r);
  background: var(--stand);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-about .data-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

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

.page-about .data-rail {
  border-top: 2px solid var(--lime);
  padding-top: 14px;
}

.page-about .data-title {
  margin: 10px 0 0;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--chalk);
}

.page-about .data-body p.prose {
  margin: 0 0 24px;
  color: var(--rock);
  font-size: 15px;
}

.page-about .flow {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--steel);
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0 16px 16px;
  border-bottom: 1px dashed var(--steel);
}

.page-about .flow__step:last-child {
  border-bottom: 0;
}

.page-about .flow__idx {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--signal);
  padding-top: 3px;
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .flow__text p {
  margin: 0;
  color: var(--rock);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  padding: 56px 0;
  background: var(--turf);
  border-top: var(--line);
  border-bottom: var(--line);
}

.page-about .crew-lead {
  margin: 14px 0 26px;
  color: var(--rock);
  font-size: 15px;
}

.page-about .shift-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}

.page-about .shift {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  grid-template-areas:
    "time name"
    "time task";
  gap: 2px 14px;
  padding: 12px 14px;
  background: var(--steel-soft);
  border-left: 3px solid var(--clay);
}

.page-about .shift__time {
  grid-area: time;
  font-size: 14px;
  font-weight: 700;
  color: var(--chalk);
  align-self: center;
}

.page-about .shift__name {
  grid-area: name;
  font-size: 14px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.04em;
}

.page-about .shift__task {
  grid-area: task;
  font-size: 13px;
  line-height: 1.6;
  color: var(--rock);
}

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

.page-about .crew-card {
  padding: 20px 18px;
  border: var(--about-edge);
  border-radius: var(--r);
  background: var(--stand);
  box-shadow: var(--shadow-sm);
  outline-offset: 3px;
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.page-about .crew-card__tag {
  margin: 0 0 10px;
  color: var(--clay);
}

.page-about .crew-card__name {
  margin: 0 0 14px;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .crew-card__tasks {
  margin: 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px dashed var(--steel);
  color: var(--rock);
  font-size: 13px;
  line-height: 1.85;
}

.page-about .crew-card__tasks li {
  position: relative;
  padding-left: 14px;
}

.page-about .crew-card__tasks li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 5px;
  height: 5px;
  background: var(--steel);
}

.page-about .crew-card:hover,
.page-about .crew-card:focus-visible {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.page-about .crew-card:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .crew-card:hover .crew-card__tasks,
.page-about .crew-card:focus-visible .crew-card__tasks {
  border-top-color: var(--lime);
  color: var(--chalk);
}

/* ---------- 内容边界 ---------- */
.page-about .about-boundary {
  padding: 56px 0;
}

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

.page-about .boundary-rail {
  border-top: 2px solid var(--signal);
  padding-top: 14px;
}

.page-about .boundary-title {
  margin: 10px 0 0;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--chalk);
}

.page-about .boundary-body p.prose {
  margin: 0 0 22px;
  color: var(--rock);
  font-size: 15px;
}

.page-about .no-list {
  margin: 0;
  padding: 22px 20px;
  list-style: none;
  border: var(--about-edge);
  border-left: 6px solid var(--signal);
  border-radius: var(--r);
  background: var(--moss);
  box-shadow: var(--shadow-sm);
}

.page-about .no-item {
  position: relative;
  padding: 10px 0 10px 26px;
  color: var(--chalk);
  font-size: 14px;
  line-height: 1.75;
  border-bottom: 1px dashed rgba(243, 240, 226, 0.16);
}

.page-about .no-item:last-child {
  border-bottom: 0;
}

.page-about .no-item::before {
  content: "×";
  position: absolute;
  left: 0;
  top: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--signal);
}

.page-about .boundary-note {
  margin: 20px 0 0;
}

.page-about .boundary-note a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--t-fast);
}

.page-about .boundary-note a:hover,
.page-about .boundary-note a:focus-visible {
  color: var(--chalk);
}

.page-about .boundary-note a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

/* ---------- 三个入口 ---------- */
.page-about .about-entries {
  padding: 0 0 56px;
}

.page-about .entry-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .entry__link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  grid-template-areas:
    "idx name"
    "idx desc";
  gap: 4px 14px;
  padding: 18px 16px;
  text-decoration: none;
  border: var(--about-edge);
  border-radius: var(--r);
  background: var(--stand);
  transition: border-color var(--t-fast), background-color var(--t-fast);
}

.page-about .entry__idx {
  grid-area: idx;
  font-size: 16px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .entry__name {
  grid-area: name;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .entry__desc {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .entry__link:hover,
.page-about .entry__link:focus-visible {
  border-color: var(--lime);
  background: var(--steel-soft);
}

.page-about .entry__link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

/* ---------- 收束 ---------- */
.page-about .about-coda {
  position: relative;
}

.page-about .coda-figure {
  margin: 0 0 28px;
  border-top: var(--about-edge);
  border-bottom: var(--about-edge);
}

.page-about .coda-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
}

.page-about .coda-text {
  margin: 0;
  padding-bottom: 64px;
  color: var(--rock);
  font-size: 15px;
}

/* ---------- 窄屏修正 ---------- */
@media (max-width: 420px) {
  .page-about .shift {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "time"
      "name"
      "task";
    gap: 4px;
  }

  .page-about .flow__step {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 720px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 36px;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 24px;
  }

  .page-about .hero-rail {
    position: sticky;
    top: 96px;
    padding-left: 20px;
  }

  .page-about .data-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 24px;
  }

  .page-about .boundary-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 24px;
  }

  .page-about .data-rail,
  .page-about .boundary-rail {
    position: sticky;
    top: 96px;
  }

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

@media (min-width: 1080px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .crew-card,
  .page-about .entry__link {
    transition: none;
  }

  .page-about .tl-node:hover,
  .page-about .crew-card:hover {
    transform: none;
  }
}