.page-about {
  --about-line: var(--hairline-700);
  --about-gap: clamp(20px, 4vw, 48px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 24px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 24px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2.3rem, 9.5vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--silver-050);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  color: var(--silver-300);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0 0;
}

.page-about .about-hero__aside {
  border-top: var(--rule) solid var(--about-line);
  padding-top: 16px;
}

.page-about .about-hero__aside-label {
  margin: 0 0 12px;
  font-size: var(--fs-1);
  letter-spacing: 0.16em;
  color: var(--silver-300);
}

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

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-stat__k {
  margin: 0;
  font-size: var(--fs-2);
  color: var(--silver-300);
}

.page-about .about-stat__v {
  margin: 0;
  font-size: var(--fs-4);
  font-weight: 700;
  color: var(--silver-050);
}

.page-about .about-stat__v--zero {
  color: var(--cyan-400);
  background: var(--grad-signal);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- 首屏宽幅图 ---------- */
.page-about .about-banner {
  position: relative;
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--page-max);
  margin: clamp(40px, 7vw, 80px) auto 0;
  border: var(--rule) solid var(--about-line);
}

.page-about .about-banner .media-frame__caption {
  color: var(--silver-300);
}

/* ---------- 年份带 ---------- */
.page-about .about-tape__rail {
  margin-top: 30px;
  border-top: var(--rule) solid var(--about-line);
  border-bottom: var(--rule) solid var(--about-line);
  padding: 24px 0;
}

.page-about .about-node {
  flex: 0 0 auto;
  width: min(320px, 78vw);
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px;
  border: var(--rule) solid var(--about-line);
  border-left-width: var(--rule-thick);
  transition: border-color var(--dur-hover), transform var(--dur-hover);
}

.page-about .about-node--indigo {
  background: var(--indigo-zone);
  border-left-color: var(--violet-500);
}

.page-about .about-node--teal {
  background: var(--teal-zone);
  border-left-color: var(--cyan-400);
}

.page-about .about-node--wine {
  background: var(--wine-zone);
  border-left-color: var(--amber-400);
}

.page-about .about-node:hover {
  border-color: var(--cyan-400);
}

.page-about .about-node__idx {
  margin: 0;
  font-size: var(--fs-1);
  letter-spacing: 0.18em;
  color: var(--silver-300);
}

.page-about .about-node__year {
  margin: 0;
  font-size: var(--fs-5);
  font-weight: 700;
  color: var(--silver-050);
}

.page-about .about-node__name {
  margin: 2px 0 0;
  font-size: var(--fs-4);
  font-weight: 600;
  color: var(--silver-050);
}

.page-about .about-node__text {
  margin: 6px 0 0;
  font-size: var(--fs-2);
  line-height: 1.7;
  color: var(--silver-300);
}

/* ---------- 纵向年份索引 + 正文 ---------- */
.page-about .about-axis__layout {
  display: grid;
  gap: 0;
}

.page-about .about-scale {
  border-top: var(--rule) solid var(--about-line);
  padding-top: 14px;
  margin-bottom: 30px;
}

.page-about .about-scale__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-scale__item {
  flex: 0 0 auto;
}

.page-about .about-scale__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--about-line);
  color: var(--silver-300);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-hover), border-color var(--dur-hover), background-color var(--dur-hover);
}

.page-about .about-scale__link:hover,
.page-about .about-scale__link:focus-visible {
  color: var(--silver-050);
  border-color: var(--cyan-400);
  background: var(--panel-900);
}

.page-about .about-scale__year {
  font-size: var(--fs-2);
  color: var(--cyan-400);
}

.page-about .about-scale__name {
  font-size: var(--fs-2);
}

.page-about .about-entry {
  position: relative;
  margin-bottom: 22px;
  padding: 24px 20px 24px 28px;
  border: var(--rule) solid var(--about-line);
  border-left: 0;
  scroll-margin-top: calc(var(--nav-h) + 32px);
  transition: border-color var(--dur-hover);
}

.page-about .about-entry::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--rule-thick);
}

.page-about .about-entry--indigo {
  background: var(--indigo-zone);
}

.page-about .about-entry--indigo::before {
  background: linear-gradient(180deg, var(--violet-500), var(--cyan-400));
}

.page-about .about-entry--teal {
  background: var(--teal-zone);
}

.page-about .about-entry--teal::before {
  background: linear-gradient(180deg, var(--cyan-400), var(--violet-500));
}

.page-about .about-entry--wine {
  background: var(--wine-zone);
}

.page-about .about-entry--wine::before {
  background: linear-gradient(180deg, var(--amber-400), var(--violet-500));
}

.page-about .about-entry:target {
  border-color: var(--cyan-400);
}

.page-about .about-entry__year {
  margin: 0;
  font-size: var(--fs-2);
  letter-spacing: 0.12em;
  color: var(--cyan-400);
}

.page-about .about-entry__title {
  margin: 10px 0 0;
  font-size: var(--fs-5);
  font-weight: 600;
  line-height: 1.3;
  color: var(--silver-050);
}

.page-about .about-entry__grid {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.page-about .about-entry__text {
  margin: 0;
  max-width: 62ch;
  line-height: 1.78;
  color: var(--silver-300);
}

.page-about .about-entry__note {
  margin: 0;
  padding-left: 14px;
  border-left: 1px solid var(--line-soft);
  font-size: var(--fs-2);
  line-height: 1.7;
  color: var(--silver-300);
}

/* ---------- 三条底线 ---------- */
.page-about .about-floor__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-floor__item {
  margin-bottom: 16px;
  border: var(--rule) solid var(--about-line);
  border-left: var(--rule-thick) solid var(--amber-400);
  background: var(--wine-zone);
}

.page-about .about-floor__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px;
  font-size: var(--fs-4);
  font-weight: 600;
  color: var(--silver-050);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-floor__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  color: var(--amber-400);
}

.page-about .about-floor__item[open] .about-floor__summary::after {
  content: "–";
}

.page-about .about-floor__body {
  padding: 0 20px 20px;
  color: var(--silver-300);
  line-height: 1.78;
}

.page-about .about-floor__body p {
  margin: 0;
  max-width: 62ch;
}

.page-about .about-floor__media {
  border: var(--rule) solid var(--about-line);
}

/* ---------- 维护方式 ---------- */
.page-about .about-upkeep__zone {
  padding: clamp(22px, 4vw, 48px);
  display: grid;
  gap: 32px;
}

.page-about .about-upkeep__lede {
  margin: 14px 0 0;
  max-width: 60ch;
  line-height: 1.78;
  color: var(--silver-300);
}

.page-about .about-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-step {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-step__num {
  margin: 0;
  font-size: var(--fs-2);
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .about-step__title {
  margin: 0;
  font-size: var(--fs-4);
  font-weight: 600;
  color: var(--silver-050);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 62ch;
  line-height: 1.72;
  color: var(--silver-300);
}

.page-about .about-meters {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-meter {
  background: var(--panel-900);
  padding: 16px;
}

.page-about .about-meter__v {
  margin: 0;
  font-size: var(--fs-5);
  font-weight: 700;
  color: var(--silver-050);
}

.page-about .about-meter__k {
  margin: 6px 0 0;
  font-size: var(--fs-1);
  line-height: 1.6;
  color: var(--silver-300);
}

.page-about .about-upkeep__media {
  border: var(--rule) solid var(--about-line);
}

/* ---------- 三类读者 ---------- */
.page-about .about-readers .data-table th[scope="row"] {
  color: var(--silver-050);
  font-weight: 600;
}

.page-about .about-readers .data-table td {
  color: var(--silver-300);
  line-height: 1.7;
}

/* ---------- 主体信息 ---------- */
.page-about .about-meta__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-meta__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--rule) solid var(--about-line);
}

.page-about .about-meta__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-meta__k {
  font-size: var(--fs-2);
  letter-spacing: 0.1em;
  color: var(--silver-300);
}

.page-about .about-meta__v {
  font-size: var(--fs-3);
  color: var(--silver-050);
  word-break: break-all;
}

.page-about .about-meta__notes p {
  margin: 0 0 14px;
  max-width: 62ch;
  line-height: 1.78;
  color: var(--silver-300);
}

.page-about .about-meta__warn {
  padding: 14px 16px;
  border-left: var(--rule-thick) solid var(--amber-400);
  background: var(--wine-zone);
  color: var(--silver-050);
}

.page-about .about-meta__more a {
  color: var(--cyan-400);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-step {
    grid-template-columns: 56px 180px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }

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

  .page-about .about-entry__grid {
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 32px;
  }

  .page-about .about-floor__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-meta__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 48px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 64px;
    align-items: end;
  }

  .page-about .about-axis__layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-scale {
    position: sticky;
    top: calc(var(--nav-h) + 28px);
    margin-bottom: 0;
    border-top: 0;
    border-left: var(--rule-thick) solid var(--about-line);
    padding: 0 0 0 20px;
  }

  .page-about .about-scale__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-scale__link {
    border: 0;
    padding: 11px 0 11px 0;
  }

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

  .page-about .about-scale__item::before {
    content: "";
    position: absolute;
    left: -24px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--about-line);
    transition: background var(--dur-hover), box-shadow var(--dur-hover);
  }

  .page-about .about-scale__item:hover::before,
  .page-about .about-scale__item:focus-within::before {
    background: var(--cyan-400);
    box-shadow: 0 0 0 4px rgba(36, 214, 232, 0.16);
  }

  .page-about .about-scale__link:hover,
  .page-about .about-scale__link:focus-visible {
    background: transparent;
    border-color: transparent;
  }

  .page-about .about-upkeep__zone {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}