.page-about {
  --about-card: #FFFDF9;
  --about-line: 3px solid var(--paper);
  background: var(--mist);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(circle at 88% 12%, rgba(46, 140, 122, .45), transparent 46%),
    radial-gradient(circle at 8% 92%, rgba(255, 106, 43, .18), transparent 40%),
    var(--ink);
  color: var(--mist);
  padding: clamp(26px, 5vw, 56px) 0 clamp(36px, 6vw, 76px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--paper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
}

.page-about .about-hero__kicker {
  margin: 18px 0 14px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--flame);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__lead {
  margin: 0 0 18px;
  max-width: 56ch;
  font-size: clamp(15.5px, 1.6vw, 17.5px);
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-hero__aside {
  margin: 0;
  font-size: 14px;
  color: var(--bamboo);
}

.page-about .about-hero__aside a {
  color: var(--score);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-hero__figure {
  margin: 0;
  border: var(--about-line);
  box-shadow: var(--shadow-hard);
  background: var(--river);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}

.page-about .about-hero__figure figcaption {
  margin: 0;
  padding: 10px 14px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper);
  border-top: 2px solid var(--paper);
}

/* ---------- 正文与右侧目录 ---------- */
.page-about .about-body {
  display: grid;
  padding-top: clamp(34px, 5vw, 68px);
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .about-toc {
  order: -1;
  margin-bottom: 26px;
  border-left: 4px solid var(--flame);
  padding-left: 12px;
}

.page-about .about-toc__title {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--slate);
  text-transform: uppercase;
}

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

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 6px 12px;
  border: 2px solid var(--paper);
  background: var(--about-card);
  color: var(--ink);
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
}

.page-about .about-toc__no {
  font-size: 11px;
  color: var(--flame);
}

.page-about .about-toc__list a[aria-current="true"] {
  background: var(--flame);
  border-color: var(--ink);
  color: var(--night);
  font-weight: 700;
}

.page-about .about-toc__list a[aria-current="true"] .about-toc__no {
  color: var(--night);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  margin-bottom: clamp(46px, 7vw, 84px);
  scroll-margin-top: 96px;
}

.page-about .about-h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  padding-bottom: 12px;
  border-bottom: var(--about-line);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 37px);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-about .about-h2__index {
  font-family: var(--font-num);
  font-size: .56em;
  letter-spacing: .1em;
  color: var(--flame);
}

.page-about .about-section p {
  max-width: 66ch;
  margin: 0 0 1em;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-section p a {
  color: var(--river);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .about-note {
  margin: 22px 0 0;
  padding: 16px 20px;
  background: var(--river);
  border-left: 8px solid var(--flame);
  color: var(--mist);
}

.page-about .about-note p {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: var(--paper);
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 18px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 16px;
  width: 14px;
  height: 14px;
  background: var(--cinnabar);
  border: 2px solid var(--ink);
}

.page-about .about-tl {
  border: var(--about-line);
  background: var(--about-card);
}

.page-about .about-tl[open] {
  box-shadow: 6px 6px 0 rgba(7, 18, 15, .9);
}

.page-about .about-tl__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 44px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__year {
  background: var(--score);
  color: var(--night);
  padding: 2px 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
}

.page-about .about-tl__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(16px, 2vw, 19px);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-tl__toggle {
  position: relative;
  width: 26px;
  height: 26px;
  border: 2px solid var(--ink);
  flex: none;
}

.page-about .about-tl__toggle::before,
.page-about .about-tl__toggle::after {
  content: "";
  position: absolute;
  background: var(--ink);
}

.page-about .about-tl__toggle::before {
  left: 5px;
  right: 5px;
  top: 10px;
  height: 2px;
}

.page-about .about-tl__toggle::after {
  top: 5px;
  bottom: 5px;
  left: 10px;
  width: 2px;
  transition: transform .2s var(--ease);
}

.page-about .about-tl[open] .about-tl__toggle::after {
  transform: scaleY(0);
}

.page-about .about-tl__body {
  padding: 2px 16px 16px 20px;
  border-left: 3px dashed var(--paper);
  margin-left: 14px;
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 图文与节奏列表 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
  border: var(--about-line);
  box-shadow: var(--shadow-hard);
  background: var(--about-card);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  border-top: 2px solid var(--paper);
  font-size: 13px;
  line-height: 1.65;
  color: var(--slate);
}

.page-about .about-beats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--about-line);
}

.page-about .about-beats li {
  display: grid;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 2px solid var(--paper);
}

.page-about .about-beats__when {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cinnabar);
  font-weight: 700;
}

.page-about .about-beats__what {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 换气横带 ---------- */
.page-about .about-band {
  position: relative;
  margin: 0 0 clamp(46px, 7vw, 84px);
  padding: clamp(28px, 4vw, 44px) clamp(20px, 3vw, 34px);
  background:
    repeating-radial-gradient(circle at 100% 0%, rgba(46, 140, 122, .22) 0 2px, transparent 2px 26px),
    var(--river);
  border: var(--about-line);
  overflow: hidden;
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 10px;
  bottom: 0;
  background: var(--flame);
}

.page-about .about-band__quote {
  position: relative;
  margin: 0;
  max-width: 34ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.8vw, 30px);
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--mist);
}

/* ---------- 资料库层级 ---------- */
.page-about .about-tree {
  list-style: none;
  margin: 26px 0 24px;
  padding: 0;
}

.page-about .about-tree__node {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border: var(--about-line);
  border-left: 8px solid var(--river);
  background: var(--about-card);
}

.page-about .about-tree__node + .about-tree__node {
  margin-top: 28px;
}

.page-about .about-tree__node + .about-tree__node::before {
  content: "";
  position: absolute;
  left: 20px;
  top: -28px;
  height: 28px;
  width: 3px;
  background: var(--flame);
}

.page-about .about-tree__no {
  flex: none;
  font-size: 12px;
  padding: 2px 6px;
  border: 2px solid var(--ink);
  color: var(--ink);
}

.page-about .about-tree__title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-about .about-tree__node p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 合作条带 ---------- */
.page-about .about-strip {
  margin-top: 28px;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
  scroll-snap-type: x proximity;
}

.page-about .about-strip__track {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.page-about .about-strip__card {
  flex: 0 0 232px;
  scroll-snap-align: start;
  padding: 16px 16px 18px;
  border: var(--about-line);
  background: var(--about-card);
  box-shadow: 5px 5px 0 rgba(7, 18, 15, .85);
}

.page-about .about-strip__card:nth-child(even) {
  margin-top: 26px;
  border-left: 8px solid var(--cinnabar);
}

.page-about .about-strip__card:nth-child(odd) {
  border-left: 8px solid var(--bamboo);
}

.page-about .about-strip__num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 6px;
}

.page-about .about-strip__card h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.page-about .about-strip__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--slate);
}

/* ---------- 成绩 ---------- */
.page-about .about-honors {
  list-style: none;
  margin: 26px 0 22px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-honors__item {
  display: grid;
  gap: 2px;
  padding: 16px 18px;
  background: var(--ink);
  border-top: 4px solid var(--score);
}

.page-about .about-honors__num {
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.05;
}

.page-about .about-honors__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(24px, 4vw, 38px) clamp(20px, 3vw, 32px);
  border: var(--about-line);
  border-top: 10px solid var(--flame);
  background: var(--about-card);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-beats li {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

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

  .page-about .about-tree__node:nth-child(2) {
    margin-left: 18px;
  }

  .page-about .about-tree__node:nth-child(3) {
    margin-left: 36px;
  }

  .page-about .about-tree__node:nth-child(4) {
    margin-left: 54px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 236px;
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-toc {
    order: 0;
    position: sticky;
    top: 24px;
    margin-bottom: 0;
    padding: 16px 14px;
    border: var(--about-line);
    border-left: 4px solid var(--flame);
    background: var(--about-card);
  }

  .page-about .about-toc__list {
    display: block;
    overflow: visible;
  }

  .page-about .about-toc__list li + li {
    margin-top: 4px;
  }

  .page-about .about-toc__list a {
    display: flex;
    width: 100%;
    padding: 8px 6px;
    border: 0;
    border-left: 3px solid transparent;
    background: transparent;
    white-space: normal;
    font-size: 14px;
    line-height: 1.45;
  }

  .page-about .about-toc__list a:hover {
    border-left-color: var(--bamboo);
    background: rgba(23, 99, 90, .08);
  }

  .page-about .about-toc__list a[aria-current="true"] {
    background: transparent;
    border-left-color: var(--flame);
    color: var(--ink);
    font-weight: 700;
  }

  .page-about .about-toc__list a[aria-current="true"] .about-toc__no {
    color: var(--cinnabar);
  }

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