.page-about {
  --about-gap: clamp(20px, 3vw, 36px);
  --about-rail-w: 116px;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(36px, 7vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(26px, 4.5vw, 52px) clamp(18px, 3vw, 28px);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 16ch;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(32px, 7.6vw, 82px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--indigo);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px 24px;
  margin: clamp(26px, 3.5vw, 40px) 0 0;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--hair);
}

.page-about .about-hero__meta dt {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.page-about .about-hero__meta dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  color: var(--indigo);
}

@media (min-width: 620px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 时间线主区 ---------- */
.page-about .about-chronicle {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: clamp(28px, 5vw, 56px);
}

.page-about .about-stream {
  min-width: 0;
}

.page-about .about-sec-title {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--indigo);
}

.page-about .about-sec-lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.9;
  color: var(--ink-soft);
}

/* 年份刻度 */
.page-about .about-rail__head {
  display: none;
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border: 1px solid var(--hair);
  border-radius: var(--radius-pill);
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--gold);
  color: var(--indigo);
}

/* 横幅图 */
.page-about .about-banner {
  margin: clamp(22px, 3vw, 32px) 0;
  border: 1px solid var(--hair);
  border-radius: var(--radius-panel);
  background: var(--indigo-deep);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-banner--tall img {
  aspect-ratio: 16 / 6;
}

.page-about .about-banner .media-frame__caption,
.page-about .about-crew__figure .media-frame__caption {
  padding: 12px 20px 14px;
  background: var(--indigo-deep);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.05em;
}

/* 主题筛选 */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 1px solid var(--hair);
}

.page-about .about-filter .filter__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

/* 时间线条目 */
.page-about .about-timeline {
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node {
  position: relative;
  padding: clamp(22px, 3vw, 36px);
  border: 1px solid var(--hair);
  border-radius: var(--radius-panel);
  background: var(--paper);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  scroll-margin-top: 96px;
}

.page-about .about-node::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, var(--indigo-mid), var(--gold));
  opacity: 0.3;
}

.page-about .about-node:nth-child(1)::after { opacity: 0.28; }
.page-about .about-node:nth-child(2)::after { opacity: 0.42; }
.page-about .about-node:nth-child(3)::after { opacity: 0.54; }
.page-about .about-node:nth-child(4)::after { opacity: 0.66; }
.page-about .about-node:nth-child(5)::after { opacity: 0.78; }
.page-about .about-node:nth-child(6)::after { opacity: 0.9; }
.page-about .about-node:nth-child(7)::after { opacity: 1; }

.page-about .about-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  margin-bottom: 12px;
}

.page-about .about-node__year {
  display: inline-block;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  background: var(--indigo);
  color: var(--cream);
  font-size: 12px;
  letter-spacing: 0.14em;
  transition: background 0.3s ease, color 0.3s ease;
}

.page-about .about-node:target .about-node__year {
  background: var(--gold);
  color: var(--indigo-deep);
}

.page-about .about-node__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 26px);
  line-height: 1.32;
  color: var(--indigo);
}

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

@media (min-width: 900px) {
  .page-about .about-chronicle {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

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

  .page-about .about-rail__list {
    position: relative;
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 16px;
    bottom: 16px;
    width: 1px;
    background: var(--hair);
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 11px 0 11px 22px;
    border: 0;
    border-radius: 0;
    background: none;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 7px;
    height: 7px;
    margin-top: -3.5px;
    border-radius: 50%;
    background: var(--indigo-mid);
    opacity: 0.45;
    transition: background 0.25s ease, opacity 0.25s ease, transform 0.25s ease;
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    background: var(--gold);
    opacity: 1;
    transform: scale(1.4);
  }

  .page-about .about-node:nth-child(3n + 2) {
    margin-left: 26px;
  }

  .page-about .about-node:nth-child(3n) {
    margin-left: 52px;
  }
}

/* ---------- 里程碑卡片带 ---------- */
.page-about .about-mile-sec {
  margin-top: clamp(48px, 8vw, 96px);
}

.page-about .about-mile {
  display: flex;
  gap: 16px;
  margin-top: clamp(22px, 3vw, 32px);
  padding: 4px 2px 24px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-mile__card {
  position: relative;
  flex: 0 0 min(272px, 76vw);
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 28px 22px 24px;
  border: 1px solid var(--hair);
  border-radius: var(--radius-card);
  background: var(--paper);
  box-shadow: var(--shadow-card);
  scroll-snap-align: start;
  overflow: hidden;
}

.page-about .about-mile__card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--mbar, var(--indigo-mid));
}

.page-about .about-mile__card:nth-child(1) { --mbar: var(--indigo); }
.page-about .about-mile__card:nth-child(2) { --mbar: var(--indigo-mid); }
.page-about .about-mile__card:nth-child(3) { --mbar: var(--jade); }
.page-about .about-mile__card:nth-child(4) { --mbar: var(--gold); }
.page-about .about-mile__card:nth-child(5) { --mbar: var(--gold-light); }
.page-about .about-mile__card:nth-child(6) { --mbar: var(--cinnabar); }

.page-about .about-mile__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--indigo);
}

.page-about .about-mile__card h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--indigo);
}

.page-about .about-mile__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew-sec {
  margin-top: clamp(48px, 8vw, 96px);
}

.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(22px, 3vw, 32px);
}

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

.page-about .about-crew__item {
  position: relative;
  padding: 20px 20px 18px;
  border: 1px solid var(--hair);
  border-radius: var(--radius-card);
  background: var(--paper);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-about .about-crew__item::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--indigo-mid);
  opacity: 0.7;
}

.page-about .about-crew__item:nth-child(3)::before {
  background: var(--gold);
}

.page-about .about-crew__item:nth-child(4)::before {
  background: var(--jade);
}

.page-about .about-crew__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 17px;
  color: var(--indigo);
}

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

.page-about .about-crew__item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--gold);
  transition: transform 0.25s ease;
}

.page-about .about-crew__item[open] summary::after {
  transform: rotate(45deg);
}

.page-about .about-crew__item p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-crew__item .tag {
  margin-right: 6px;
}

.page-about .about-crew__figure {
  margin: 0;
  border: 1px solid var(--hair);
  border-radius: var(--radius-panel);
  background: var(--indigo-deep);
  overflow: hidden;
}

.page-about .about-crew__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

@media (min-width: 640px) {
  .page-about .about-crew__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-crew__item:nth-child(1) {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .page-about .about-crew__item:nth-child(2) {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-crew__item:nth-child(3) {
    grid-column: 2;
    grid-row: 2;
  }

  .page-about .about-crew__item:nth-child(4) {
    grid-column: 1 / -1;
    grid-row: 3;
  }
}

@media (min-width: 900px) {
  .page-about .about-crew {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }
}

/* ---------- 栏目体系 ---------- */
.page-about .about-pillars-sec {
  margin-top: clamp(48px, 8vw, 96px);
}

.page-about .about-pillars {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-pillar {
  padding: 24px 22px 26px;
  border: 1px solid var(--hair);
  border-radius: var(--radius-card);
  background: var(--paper);
}

.page-about .about-pillar__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 14px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0;
}

.page-about .about-pillar h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 19px;
  color: var(--indigo);
}

.page-about .about-pillar p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

@media (min-width: 640px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 固定动作 ---------- */
.page-about .about-rituals-sec {
  margin-top: clamp(48px, 8vw, 96px);
}

.page-about .about-rituals {
  display: grid;
  margin-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--hair);
}

.page-about .about-ritual {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-ritual__tag {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-ritual h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--indigo);
}

.page-about .about-ritual p {
  margin: 0;
  max-width: 74ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink);
}

@media (min-width: 768px) {
  .page-about .about-ritual {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }
}

/* ---------- 运营数据 ---------- */
.page-about .about-figures-sec {
  margin-top: clamp(48px, 8vw, 96px);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(22px, 3vw, 32px);
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.page-about .about-ring {
  position: relative;
  display: grid;
  place-items: center;
  width: clamp(100px, 13vw, 136px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: conic-gradient(
    var(--gold) calc(var(--p, 30) * 1%),
    rgba(27, 42, 74, 0.13) 0
  );
}

.page-about .about-figure:nth-child(1) .about-ring { --p: 92; }
.page-about .about-figure:nth-child(2) .about-ring { --p: 68; }
.page-about .about-figure:nth-child(3) .about-ring { --p: 84; }
.page-about .about-figure:nth-child(4) .about-ring { --p: 63; }

.page-about .about-ring::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  background: var(--cream);
}

.page-about .about-ring__num {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 23px);
  line-height: 1;
  color: var(--indigo);
}

.page-about .about-figure__label {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  margin-top: clamp(56px, 10vw, 120px);
  padding-block: clamp(40px, 8vw, 96px);
  border-top: 1px solid var(--hair);
  text-align: center;
}

.page-about .about-close__line {
  max-width: 22ch;
  margin: 0 auto;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--indigo);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-rail__link::before,
  .page-about .about-node__year,
  .page-about .about-crew__item summary::after {
    transition: none;
  }
}