.page-about {
  --about-rail-w: 132px;
  --about-radius: 18px;
  color: var(--text);
  background: var(--ink);
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .breadcrumb {
  padding: 22px 0 0;
  font-size: 13px;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 44px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -55%;
  width: min(780px, 120%);
  height: 420px;
  background: radial-gradient(circle at 35% 35%, rgba(184, 255, 60, 0.16), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--volt);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 900px;
  font-size: clamp(30px, 7.2vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--sub);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stats .stat {
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, rgba(13, 23, 48, 0.95), rgba(7, 11, 24, 0.6));
}

.page-about .about-num {
  display: block;
  font-family: var(--font-score);
  font-size: clamp(32px, 8vw, 46px);
  font-weight: 800;
  line-height: 1;
  color: var(--pure);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.page-about .about-unit {
  margin-left: 3px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--sub);
}

.page-about .about-hero__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sub);
}

.page-about a {
  color: var(--volt);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 60, 0.35);
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--pure);
  border-bottom-color: var(--pure);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__intro {
  max-width: 68ch;
  margin-bottom: 26px;
}

.page-about .about-timeline__media {
  margin: 0 0 40px;
}

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

.page-about .about-years {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-years__label {
  display: none;
  color: var(--sub);
  letter-spacing: 0.16em;
}

.page-about .about-years__link {
  flex: 0 0 auto;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--sub);
  border-bottom: 1px solid var(--line);
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  border-color: var(--volt);
  color: var(--volt);
  background: rgba(184, 255, 60, 0.08);
}

.page-about .about-nodes {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node {
  position: relative;
  padding: 0 0 34px 26px;
  border-left: 1px solid var(--line);
  scroll-margin-top: 120px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-node:target::before {
  background: var(--volt);
  box-shadow: 0 0 0 5px rgba(184, 255, 60, 0.16);
}

.page-about .about-node__year {
  margin: 0 0 6px;
  font-family: var(--font-score);
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--sub);
  font-variant-numeric: tabular-nums;
  transition: color 0.2s var(--ease);
}

.page-about .about-node:target .about-node__year {
  color: var(--volt);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-node__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sub);
}

/* ---------- 结构层级 ---------- */
.page-about .about-structure .section__lead {
  max-width: 68ch;
  margin-bottom: 30px;
}

.page-about .about-tree {
  display: grid;
  gap: 8px;
  padding: 22px 18px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(200deg, rgba(13, 23, 48, 0.9), rgba(7, 11, 24, 0.5));
}

.page-about .about-tree__row {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
  padding: 12px 12px 12px calc(12px + var(--depth, 0px));
  border-left: 2px solid var(--line);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-tree__row:hover {
  border-left-color: var(--volt);
  background: rgba(184, 255, 60, 0.05);
}

.page-about .about-tree__row--1 { --depth: 0px; border-left-color: var(--volt); }
.page-about .about-tree__row--2 { --depth: 16px; }
.page-about .about-tree__row--3 { --depth: 32px; }
.page-about .about-tree__row--4 { --depth: 48px; }
.page-about .about-tree__row--5 { --depth: 64px; }

.page-about .about-tree__idx {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--surge);
}

.page-about .about-tree__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-tree__desc {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sub);
}

/* ---------- V4 资料库 ---------- */
.page-about .about-v4__media {
  margin: 0 0 30px;
}

.page-about .about-v4__head {
  max-width: 68ch;
  margin-bottom: 24px;
}

.page-about .about-v4__head .section__lead {
  margin-bottom: 0;
}

.page-about .about-fields {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-field {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(13, 23, 48, 0.72);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-field:hover {
  border-color: rgba(184, 255, 60, 0.5);
  transform: translateX(3px);
}

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

.page-about .about-field__val {
  font-size: 15px;
  line-height: 1.75;
  color: var(--sub);
}

.page-about .about-v4__link {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sub);
}

/* ---------- 数据来源 ---------- */
.page-about .about-source__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-source__text p {
  margin: 0 0 1.2em;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sub);
}

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

.page-about .about-rhythm {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-rhythm__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rhythm__key {
  margin: 0;
  font-size: 13px;
  color: var(--sub);
}

.page-about .about-rhythm__val {
  margin: 0;
  font-family: var(--font-score);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ---------- 团队 ---------- */
.page-about .about-team .section__lead {
  max-width: 66ch;
  margin-bottom: 28px;
}

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

.page-about .about-team {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(13, 23, 48, 0.68);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-team:hover {
  border-color: rgba(184, 255, 60, 0.45);
  background: rgba(18, 37, 28, 0.6);
}

.page-about .about-team__bar {
  height: 12px;
  border-radius: 6px;
  background: var(--fill);
  transition: width 0.3s var(--ease);
}

.page-about .about-team--ops { --fill: rgba(184, 255, 60, 0.95); --w: 38.2%; }
.page-about .about-team--tech { --fill: rgba(184, 255, 60, 0.72); --w: 26.5%; }
.page-about .about-team--editor { --fill: rgba(184, 255, 60, 0.52); --w: 17.6%; }
.page-about .about-team--support { --fill: rgba(184, 255, 60, 0.34); --w: 17.6%; }

.page-about .about-team__bar { width: var(--w); }

.page-about .about-team__num {
  margin: 12px 0 2px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--surge);
}

.page-about .about-team__role {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-team__duty {
  margin: 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sub);
}

/* ---------- 合作伙伴与认可 ---------- */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-partners__main p {
  margin: 0 0 1.2em;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sub);
}

.page-about .about-partners__side {
  display: grid;
  gap: 14px;
}

.page-about .about-honor {
  padding: 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--surge);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(13, 23, 48, 0.7);
}

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

.page-about .about-honor__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-honor__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sub);
}

/* ---------- 反馈 ---------- */
.page-about .about-report__box {
  padding: 26px 20px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background:
    radial-gradient(circle at 88% 12%, rgba(255, 122, 26, 0.16), transparent 58%),
    linear-gradient(180deg, rgba(13, 23, 48, 0.92), rgba(7, 11, 24, 0.7));
}

.page-about .about-report__box .section__title {
  margin-bottom: 14px;
}

.page-about .about-report__box p {
  margin: 0 0 1em;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sub);
}

.page-about .about-report__hint {
  margin-bottom: 0;
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  overflow: hidden;
  border-radius: var(--about-radius);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 0.4s var(--ease);
}

.page-about .media-frame:hover .media-frame__img {
  transform: scale(1.03);
}

.page-about .media-frame__caption {
  padding: 10px 14px 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sub);
  border-top: 1px solid var(--line);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 40px 0 56px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

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

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

/* ---------- 桌面：左侧年份刻度轨 ---------- */
@media (min-width: 1000px) {
  .page-about .about-timeline__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-years {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    display: block;
    overflow: visible;
    align-self: start;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-years__label {
    display: block;
    margin: 0 0 14px 14px;
    font-size: 11px;
  }

  .page-about .about-years__link {
    display: block;
    margin: 0 0 4px;
    padding: 7px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 15px;
    background: none;
  }

  .page-about .about-years__link:hover,
  .page-about .about-years__link:focus-visible {
    border-left-color: var(--volt);
    background: rgba(184, 255, 60, 0.08);
  }

  .page-about .about-node {
    padding-left: 34px;
    padding-bottom: 44px;
  }

  .page-about .about-node__year {
    font-size: 44px;
  }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    grid-template-areas:
      "text media"
      "rhythm media";
    gap: 32px 44px;
    align-items: start;
  }

  .page-about .about-source__text { grid-area: text; }
  .page-about .about-source__media { grid-area: media; }
  .page-about .about-rhythm { grid-area: rhythm; }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-report__box {
    padding: 40px 36px;
  }

  .page-about .about-team__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

/* 悬停展开职责说明（仅指针设备） */
@media (min-width: 1000px) and (hover: hover) {
  .page-about .about-team__duty {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.24s var(--ease), opacity 0.24s var(--ease);
  }

  .page-about .about-team:hover .about-team__duty,
  .page-about .about-team:focus-within .about-team__duty {
    max-height: 160px;
    opacity: 1;
  }
}

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