.page-about {
  --about-module: 64px;
  --about-line: 1px solid var(--wood);
  --about-hair: 1px solid var(--grid);
  --about-max: 68ch;
}

@media (min-width: 900px) {
  .page-about {
    --about-module: 104px;
  }
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: calc(var(--header-h) + 24px);
  padding-bottom: 48px;
  border-bottom: var(--about-line);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 36px;
}

.page-about .about-hero__tag {
  display: block;
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2.1rem, 8vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .about-hero__lead strong {
  color: var(--ink);
  font-weight: 600;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 40px 0 0;
  max-width: 760px;
  border-top: var(--about-line);
  border-left: var(--about-line);
}

.page-about .about-figures__item {
  padding: 16px 18px;
  border-right: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-figures dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--wood);
}

.page-about .about-figures dd {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.page-about .about-figures .num {
  margin-right: 3px;
  font-size: 26px;
  line-height: 1;
  color: var(--dice);
}

@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  padding: var(--about-module) 0;
  border-bottom: var(--about-hair);
}

.page-about .about-head {
  margin-bottom: 40px;
  max-width: var(--about-max);
}

.page-about .about-h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.5rem, 5vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .about-intro {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline__grid {
  display: block;
}

.page-about .about-years {
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin-bottom: 28px;
  background: var(--paper);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-years::-webkit-scrollbar {
  display: none;
}

.page-about .about-years a {
  flex: 0 0 auto;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.1em;
  color: var(--wood);
  text-decoration: none;
  border-right: var(--about-hair);
  transition: background-color 0.16s ease, color 0.16s ease;
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible,
.page-about .about-years a[data-current="true"] {
  color: var(--paper);
  background: var(--seal);
}

.page-about .about-node {
  padding: 36px 0;
  border-bottom: var(--about-hair);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-node:first-child {
  padding-top: 0;
}

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

.page-about .about-node__year {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--seal);
  border-bottom: 2px solid var(--gold);
}

.page-about .about-node__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.2rem, 4.2vw, 1.65rem);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-node__text {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .about-node__scale {
  margin-top: 22px;
  height: 6px;
  background: var(--paper-deep);
  border: var(--about-hair);
}

.page-about .about-node__scale-bar {
  display: block;
  height: 100%;
  background: var(--teal);
}

.page-about .about-node__scale-bar--1 { width: 26%; }
.page-about .about-node__scale-bar--2 { width: 48%; }
.page-about .about-node__scale-bar--3 { width: 74%; }
.page-about .about-node__scale-bar--4 { width: 100%; }

.page-about .about-node__more {
  margin-top: 20px;
  border-top: var(--about-hair);
}

.page-about .about-node__more summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--dice);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__more summary::before {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  color: var(--dice);
}

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

.page-about .about-node__list {
  margin: 0 0 6px;
  padding: 0;
  list-style: none;
}

.page-about .about-node__list li {
  position: relative;
  padding: 10px 0 10px 22px;
  border-top: var(--about-hair);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-node__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 9px;
  height: 1px;
  background: var(--wood);
}

.page-about .about-node__figure {
  margin: 0;
  border: var(--about-hair);
}

.page-about .about-node__figure .figure-cap {
  padding: 8px 10px;
  border-top: var(--about-hair);
  font-size: 12px;
  line-height: 1.6;
  color: var(--wood);
}

@media (min-width: 900px) {
  .page-about .about-timeline__grid {
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
  }

  .page-about .about-years {
    flex-direction: column;
    overflow: visible;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin-bottom: 0;
    background: transparent;
    border-top: 0;
    border-bottom: 0;
    border-right: var(--about-hair);
  }

  .page-about .about-years a {
    padding: 18px 20px 18px 2px;
    font-size: 19px;
    border-right: 0;
    border-bottom: var(--about-hair);
  }
}

@media (min-width: 860px) {
  .page-about .about-node--with-figure {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }
}

/* ---------- 读者 ---------- */

.page-about .about-readers__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: var(--about-line);
}

.page-about .about-readers__item {
  padding: 26px 0;
  border-bottom: var(--about-hair);
}

.page-about .about-readers__item h3 {
  margin: 12px 0 0;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-readers__item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-readers__note {
  margin: 32px 0 0;
  padding: 18px 20px;
  background: var(--paper-deep);
  border-left: 4px solid var(--gold);
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .about-readers__note .num {
  font-size: 18px;
  color: var(--dice);
}

@media (min-width: 780px) {
  .page-about .about-readers__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-left: var(--about-line);
  }

  .page-about .about-readers__item {
    padding: 28px 24px;
    border-bottom: 0;
    border-right: var(--about-line);
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team__banner {
  margin: 0 0 36px;
  border: var(--about-hair);
}

.page-about .about-team__banner .figure-cap {
  padding: 8px 10px;
  border-top: var(--about-hair);
  font-size: 12px;
  line-height: 1.6;
  color: var(--wood);
}

.page-about .about-table {
  border-top: var(--about-line);
  border-left: var(--about-line);
}

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

.page-about .about-table__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-bottom: var(--about-hair);
}

.page-about .about-table__row > * {
  padding: 14px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  border-right: var(--about-line);
}

.page-about .about-table__row:nth-child(even) {
  background: var(--paper-deep);
}

.page-about .about-table__role {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-table__count {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--wood);
}

.page-about .about-table__count .num {
  font-size: 22px;
  color: var(--dice);
}

@media (min-width: 780px) {
  .page-about .about-table__head {
    display: grid;
    grid-template-columns: 1.05fr 0.45fr 2.5fr;
    background: var(--paper-deep);
  }

  .page-about .about-table__head > span {
    padding: 12px 18px;
    border-right: var(--about-line);
    border-bottom: var(--about-line);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--wood);
  }

  .page-about .about-table__row {
    grid-template-columns: 1.05fr 0.45fr 2.5fr;
    border-bottom: var(--about-line);
  }

  .page-about .about-table__row > * {
    padding: 18px;
  }
}

/* ---------- 数据出处 ---------- */

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: var(--about-line);
  border-left: var(--about-line);
}

.page-about .about-flow__step {
  padding: 26px 22px;
  border-right: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-flow__no {
  display: block;
  font-size: 24px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-flow__step h3 {
  margin: 14px 0 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-flow__step p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-data__note {
  margin: 32px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .about-data__note .num {
  font-size: 18px;
  color: var(--dice);
}

@media (min-width: 880px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 地域与备案 ---------- */

.page-about .about-region {
  padding: var(--about-module) 0;
  border-bottom: var(--about-line);
  background-color: var(--paper-deep);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(139, 90, 43, 0.13) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 47px, rgba(139, 90, 43, 0.1) 47px 48px);
}

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

.page-about .about-region__text {
  padding: 26px 20px;
  background: var(--paper);
  border: var(--about-line);
}

.page-about .about-region__lead {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .about-region__meta {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-hair);
}

.page-about .about-region__meta li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: var(--about-hair);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-region__meta li > span:first-child {
  padding-top: 3px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--wood);
}

.page-about .about-region__meta .num {
  font-size: 13px;
  color: var(--ink);
  word-break: break-all;
}

.page-about .about-region__figure {
  margin: 0;
  border: var(--about-line);
  background: var(--paper);
}

.page-about .about-region__figure .figure-cap {
  padding: 8px 10px;
  border-top: var(--about-hair);
  font-size: 12px;
  line-height: 1.6;
  color: var(--wood);
}

@media (min-width: 880px) {
  .page-about .about-region__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-region__text {
    padding: 34px 32px;
  }
}

/* ---------- 结尾导航 ---------- */

.page-about .about-next {
  border-bottom: 0;
}

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

.page-about .about-next__text .about-intro {
  max-width: 46ch;
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: var(--about-line);
  border-left: var(--about-line);
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  border-right: var(--about-line);
  border-bottom: var(--about-line);
  text-decoration: none;
  color: var(--ink);
  transition: background-color 0.18s ease, color 0.18s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-next__link .index-label {
  color: var(--seal);
}

.page-about .about-next__link:hover .index-label,
.page-about .about-next__link:focus-visible .index-label {
  color: var(--gold);
}

.page-about .about-next__label {
  font-size: 14px;
  line-height: 1.7;
}

@media (min-width: 780px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 56px;
    align-items: start;
  }

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

/* ---------- 图片兜底 ---------- */

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  object-fit: cover;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-years a,
  .page-about .about-next__link {
    transition: none;
  }
}