.page-about {
  --about-soft: rgba(15, 181, 166, 0.09);
  --about-soft-line: rgba(15, 181, 166, 0.3);
  --about-ink-soft: rgba(11, 27, 43, 0.05);
  --about-ink-line: rgba(11, 27, 43, 0.14);
  display: block;
  padding-bottom: 40px;
}

.page-about .crumbs {
  margin: 20px 0 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding: 22px 0 8px;
}

.page-about .about-intro__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-intro h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 58px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.06;
  color: var(--ink);
  margin: 12px 0 0;
}

.page-about .about-intro__text {
  margin: 20px 0 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--read);
  max-width: 34em;
}

.page-about .about-intro__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 34px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--mist);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 84px;
}

.page-about .stat__num {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1.1;
}

.page-about .stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ghost);
}

/* 章节索引卡 */
.page-about .about-intro__map {
  background: var(--ink);
  border-radius: var(--r-block);
  padding: 26px 24px 24px;
  color: var(--rail-text);
  position: relative;
  overflow: hidden;
}

.page-about .about-intro__map::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -60px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(63, 227, 210, 0.22), rgba(15, 181, 166, 0) 70%);
  pointer-events: none;
}

.page-about .about-intro__map-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-intro__map-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-intro__map-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid rgba(198, 213, 220, 0.14);
  color: var(--rail-text);
  text-decoration: none;
  font-size: 15px;
  transition: color 180ms var(--ease);
}

.page-about .about-intro__map-list li:last-child a {
  border-bottom: 0;
}

.page-about .about-intro__map-list a:hover,
.page-about .about-intro__map-list a:focus-visible {
  color: var(--cyan);
}

.page-about .about-intro__map-list .num {
  color: var(--aqua);
  font-size: 12px;
  letter-spacing: 0.08em;
  flex: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: 46px 0;
  border-top: 1px solid var(--mist);
}

.page-about .chapter:first-of-type {
  border-top: 0;
}

.page-about .chapter__grid {
  display: grid;
  gap: 18px;
}

.page-about .chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.page-about .chapter__num {
  appearance: none;
  background: none;
  border: 0;
  padding: 0;
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--aqua);
  cursor: pointer;
  flex: none;
  transition: color 180ms var(--ease);
}

.page-about .chapter__num:hover,
.page-about .chapter__num:focus-visible {
  color: var(--aqua-deep);
}

.page-about .chapter__num[data-copied] {
  color: var(--penalty);
}

.page-about .chapter__principle {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink);
  padding-left: 13px;
  border-left: 2px solid var(--aqua);
}

.page-about .chapter__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .chapter__lead {
  margin: 0 0 26px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--read);
  max-width: 36em;
}

.page-about .chapter__main p {
  color: var(--read);
}

.page-about .chapter__footnote {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ghost);
}

.page-about .chapter__main a {
  color: var(--aqua-deep);
  text-decoration: underline;
  text-decoration-color: rgba(15, 181, 166, 0.45);
  text-underline-offset: 3px;
}

.page-about .chapter__main a:hover {
  text-decoration-color: var(--aqua);
}

.page-about .chapter__media {
  margin: 0 0 28px;
}

/* ---------- 边界声明 ---------- */
.page-about .boundary-grid {
  display: grid;
  gap: 14px;
}

.page-about .boundary {
  border-radius: var(--r-card);
  padding: 18px 20px 16px;
  border: 1px solid var(--mist);
  background: var(--white);
}

.page-about .boundary--keep {
  background: var(--about-soft);
  border-color: var(--about-soft-line);
}

.page-about .boundary--stop {
  background: var(--about-ink-soft);
  border-color: var(--about-ink-line);
}

.page-about .boundary__label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ghost);
}

.page-about .boundary__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.35;
}

.page-about .boundary p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .boundary__more {
  margin-top: 12px;
  border-top: 1px dashed var(--mist);
  padding-top: 10px;
}

.page-about .boundary__more summary {
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--aqua-deep);
  list-style: none;
}

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

.page-about .boundary__more summary::before {
  content: "＋ ";
  font-weight: 700;
}

.page-about .boundary__more[open] summary::before {
  content: "－ ";
}

.page-about .boundary__more p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--read);
}

/* ---------- 筛选 ---------- */
.page-about .filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding: 14px;
  margin-bottom: 24px;
  border: 1px solid var(--mist);
  border-radius: var(--r-pill);
  background: var(--white);
}

.page-about .filters__count {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ghost);
}

/* ---------- 专栏卡片 ---------- */
.page-about .column-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .column-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  border: 1px solid var(--mist);
  border-radius: var(--r-card);
  background: var(--white);
  transition: border-color 180ms var(--ease);
}

.page-about .column-card:hover {
  border-color: rgba(15, 181, 166, 0.5);
}

.page-about .column-card__top {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .column-card__id {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--aqua-deep);
  padding: 3px 9px;
  border-radius: var(--r-pill);
  background: var(--about-soft);
  flex: none;
}

.page-about .column-card__name {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .column-card__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .column-card__meta {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--mist);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ghost);
}

/* ---------- 流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .flow__step {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 0 0 26px 52px;
}

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

.page-about .flow__step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 18px;
  top: 40px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--mist), rgba(201, 211, 216, 0.2));
  border-radius: var(--r-pill);
}

.page-about .flow__node {
  position: absolute;
  left: 0;
  top: 0;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--cyan);
  font-weight: 700;
  font-size: 15px;
  border: 2px solid var(--aqua);
}

.page-about .flow__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.4;
}

.page-about .flow__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--read);
}

/* 两轮校对差异 */
.page-about .dual-note {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .dual-note__item {
  border-radius: var(--r-card);
  padding: 18px 20px;
  background: var(--paper);
  border-left: 3px solid var(--aqua);
}

.page-about .dual-note__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .dual-note__label {
  margin-bottom: 8px !important;
  font-size: 12px !important;
  letter-spacing: 0.1em;
  color: var(--aqua-deep) !important;
}

/* ---------- 批次与归档 ---------- */
.page-about .batch-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .batch {
  padding: 20px;
  border-radius: var(--r-card);
  background: var(--ink);
  color: var(--rail-text);
}

.page-about .batch__time {
  margin: 0;
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1;
  color: var(--cyan);
}

.page-about .batch__name {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .batch__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rail-text);
}

.page-about .archive__hint {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ghost);
}

.page-about .archive__bands {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .band {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) 52px;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  border-radius: var(--r-pill);
  text-decoration: none;
  transition: background 180ms var(--ease);
}

.page-about .band:hover,
.page-about .band:focus-visible {
  background: var(--about-soft);
}

.page-about .band__label {
  font-size: 13px;
  color: var(--read);
  white-space: nowrap;
}

.page-about .band__bar {
  display: block;
  width: var(--w, 50%);
  min-width: 22px;
  height: 10px;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--aqua), var(--cyan));
}

.page-about .band__val {
  font-size: 12px;
  color: var(--ghost);
  text-align: right;
}

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

.page-about .archive__note {
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--mist);
  background: var(--white);
  font-size: 15px;
  line-height: 1.8;
  color: var(--read);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .archive__note:target {
  border-color: var(--aqua);
  background: var(--about-soft);
}

.page-about .archive__note-key {
  display: inline-block;
  margin-right: 10px;
  padding: 2px 10px;
  border-radius: var(--r-pill);
  background: var(--ink);
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 22px;
}

.page-about .team-cards {
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  padding: 18px 20px;
  border-radius: var(--r-card);
  border: 1px solid var(--mist);
  background: var(--white);
}

.page-about .team-card__id {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ghost);
}

.page-about .team-card__name {
  margin: 6px 0 8px;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .team-figure {
  margin: 0;
  border-radius: var(--r-block);
  overflow: hidden;
  border: 1px solid var(--mist);
}

.page-about .team-figure .media__img,
.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-block);
}

/* ---------- 备案 ---------- */
.page-about .legal-rows {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--mist);
}

.page-about .legal-row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--mist);
}

.page-about .legal-row dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ghost);
}

.page-about .legal-row dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .legal-row__note {
  display: inline-block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--read);
}

.page-about .legal-closing {
  margin-top: 26px;
  padding: 20px;
  border-radius: var(--r-card);
  background: var(--paper);
  border-left: 3px solid var(--penalty);
}

.page-about .legal-closing p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .legal-closing__line {
  margin-top: 12px !important;
  font-weight: 700;
  color: var(--ink) !important;
}

/* ---------- 图片通用 ---------- */
.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .chapter {
    padding: 58px 0;
  }

  .page-about .filters__count {
    margin-left: auto;
  }

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

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

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

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

  .page-about .legal-row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-intro {
    padding: 34px 0 12px;
  }

  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.86fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .chapter__grid {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    position: sticky;
    top: 32px;
  }

  .page-about .chapter__num {
    font-size: 54px;
  }

  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .flow__step,
  .page-about .flow__step:last-child {
    padding: 62px 0 0;
  }

  .page-about .flow__step::after {
    display: none;
  }

  .page-about .flow__node {
    left: 0;
    top: 0;
  }

  .page-about .flow__step:not(:last-child)::before {
    content: "";
    position: absolute;
    left: 44px;
    top: 18px;
    right: -18px;
    height: 3px;
    border-radius: var(--r-pill);
    background: linear-gradient(90deg, var(--aqua), rgba(15, 181, 166, 0.15));
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    gap: 30px;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .column-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

.page-about {
  --w: 1rem;
}