.page-about {
  --ab-ink-soft: rgba(15, 21, 18, 0.72);
  overflow-x: clip;
}

.page-about .about-crumb {
  padding-top: 20px;
}

.page-about .crumb-sep {
  margin: 0 8px;
  color: var(--c-line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 10px 0 56px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(32px, 7.6vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--c-gold);
  display: inline-block;
  padding-bottom: 4px;
  box-shadow: inset 0 -6px 0 rgba(178, 58, 46, 0.35);
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-paper-dim);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .stat {
  background: var(--c-moss);
  padding: 14px 16px 16px;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--c-gold);
}

.page-about .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-fade);
}

.page-about .about-hero__stack {
  position: relative;
  display: grid;
  gap: 10px;
  padding-left: 26px;
}

.page-about .about-hero__stack::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-gold), var(--c-line) 65%, transparent);
}

.page-about .drawer {
  position: relative;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 16px;
  background: linear-gradient(140deg, var(--c-pine), var(--c-moss));
  border: 1px solid var(--c-line);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .drawer::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -4.5px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px var(--c-ink);
}

.page-about .drawer__no {
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: 0.06em;
  color: var(--c-gold);
}

.page-about .drawer__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-paper-dim);
}

/* ---------- 沿革 ---------- */
.page-about .about-intro {
  margin: 28px 0 36px;
}

.page-about .about-intro__img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
}

.page-about .about-intro__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-fade);
}

.page-about .about-axis {
  display: grid;
  gap: 24px;
}

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

.page-about .about-axis__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  display: grid;
  gap: 18px;
}

.page-about .about-axis__list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-gold), var(--c-line) 40%, var(--c-line));
}

.page-about .gen {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--c-moss);
  border: 1px solid var(--c-line);
  border-left: 2px solid var(--c-line);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .gen::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 24px;
  height: 24px;
  background: var(--c-ink);
  clip-path: polygon(0 0, 100% 100%, 0 100%);
  border-left: 1px solid var(--c-line);
}

.page-about .gen:hover,
.page-about .gen:focus-within {
  background: var(--c-pine);
  border-left-color: var(--c-gold);
}

.page-about .gen__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .gen__no {
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--c-gold);
}

.page-about .gen__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-mist);
}

.page-about .gen__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-paper-dim);
}

.page-about .gen__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .gen__points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .gen__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 1px;
  background: var(--c-amber);
}

.page-about .about-axis__media {
  padding-left: 4px;
}

.page-about .about-axis__media img {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  border: 1px solid var(--c-line);
}

.page-about .axis-ticks {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
  position: relative;
  display: grid;
  gap: 46px;
}

.page-about .axis-ticks::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-gold), var(--c-line));
}

.page-about .axis-ticks__i {
  position: relative;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-fade);
}

.page-about .axis-ticks__i::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  width: 7px;
  height: 1px;
  background: var(--c-line);
}

.page-about .axis-ticks__i:first-child::before {
  background: var(--c-amber);
}

.page-about .about-axis__railnote {
  display: block;
  margin-bottom: 22px;
  color: var(--c-fade);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team .section-head__title {
  color: var(--c-ink);
}

.page-about .about-team .section-head__note {
  color: var(--ab-ink-soft);
}

.page-about .about-team .eyebrow {
  color: var(--c-red);
}

.page-about .about-team__grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .crew {
  background: var(--c-ink);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-gold);
}

.page-about .crew__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .crew__head::-webkit-details-marker {
  display: none;
}

.page-about .crew__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-gold);
}

.page-about .crew__name {
  flex: 1 1 auto;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .crew__count {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-fade);
}

.page-about .crew__head::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--c-amber);
}

.page-about .crew[open] .crew__head::after {
  content: "−";
}

.page-about .crew__body {
  padding: 0 16px 16px;
}

.page-about .crew__body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-paper-dim);
}

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

/* ---------- 索引 ---------- */
.page-about .about-index__grid {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

.page-about .tagboard {
  padding: 18px;
  background: var(--c-moss);
  border: 1px solid var(--c-line);
}

.page-about .tagboard__hint {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-fade);
}

.page-about .tagboard__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .tagboard__item {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 11px 12px;
  background: var(--c-ink);
  border: 1px solid var(--c-line);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .tagboard__item:hover,
.page-about .tagboard__item:focus-within {
  border-color: var(--c-gold);
  transform: translateX(3px);
}

.page-about .tagboard__meta {
  flex: 1 1 12ch;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-paper-dim);
}

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

.page-about .about-index__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-line);
}

.page-about .about-index__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--c-fade);
}

.page-about .index-notes {
  margin-top: 26px;
  border-top: 1px solid var(--c-line);
}

.page-about .index-notes__row {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .index-notes__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .index-notes__val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-paper-dim);
}

/* ---------- 更新节奏 ---------- */
.page-about .weekbar {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
  margin: 26px 0 20px;
}

.page-about .weekbar__day {
  padding: 12px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-fade);
  background: var(--c-moss);
  border: 1px solid var(--c-line);
}

.page-about .weekbar__day--hot {
  color: var(--c-ink);
  font-weight: 700;
  background: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about .cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .cadence {
  padding: 18px;
  background: var(--c-moss);
  border: 1px solid var(--c-line);
  border-top: 2px solid var(--c-amber);
}

.page-about .cadence__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--c-gold);
}

.page-about .cadence h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .cadence p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-paper-dim);
}

/* ---------- 规模 ---------- */
.page-about .about-scale__inner {
  padding: 34px 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-scale__inner .section-head__title {
  margin: 0;
}

.page-about .scale-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .scale-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-paper-dim);
}

.page-about .scale-list .mono {
  flex: 0 0 auto;
  min-width: 78px;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--c-gold);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .next-card {
  display: block;
  padding: 20px 18px;
  background: linear-gradient(150deg, var(--c-pine), var(--c-ink) 78%);
  border: 1px solid var(--c-line);
  color: var(--c-mist);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--c-gold);
  transform: translateY(-3px);
}

.page-about .next-card__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-amber);
}

.page-about .next-card__t {
  display: block;
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .next-card__d {
  display: block;
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--c-paper-dim);
}

/* ---------- 断点 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 44px;
  }

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

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

  .page-about .about-index__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 24px;
  }

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

  .page-about .scale-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 28px;
  }

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

  .page-about .index-notes__row {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding-bottom: 76px;
  }

  .page-about .about-hero__grid {
    gap: 64px;
  }

  .page-about .about-intro {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.5fr);
    align-items: end;
    gap: 24px;
  }

  .page-about .about-intro__img {
    max-height: 300px;
  }

  .page-about .about-axis {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 36px;
  }

  .page-about .about-axis__rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-axis__list {
    padding-left: 26px;
    gap: 22px;
  }

  .page-about .gen {
    padding: 22px 24px 24px;
  }

  .page-about .about-axis__media {
    padding-left: 0;
  }

  .page-about .about-axis__media img {
    max-width: 260px;
  }

  .page-about .crew__head {
    padding: 16px 20px;
  }

  .page-about .crew__body {
    padding: 0 20px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .gen,
  .page-about .tagboard__item,
  .page-about .next-card {
    transition-duration: 0.12s;
  }

  .page-about .tagboard__item:hover,
  .page-about .tagboard__item:focus-within,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}