.page-about {
  --about-rule: rgba(42, 53, 87, 0.8);
  --about-rule-soft: rgba(42, 53, 87, 0.5);
  --about-gold-glow: rgba(242, 184, 87, 0.18);
  --about-gap: clamp(18px, 3vw, 32px);
}

.page-about a:focus-visible {
  outline: 2px solid var(--sy-gold);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  padding-block: clamp(26px, 5vw, 56px) clamp(40px, 7vw, 88px);
  align-items: center;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--sy-font-display);
  font-weight: 900;
  font-size: var(--sy-t1);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--sy-paper);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 3vw, 24px) 0 0;
  max-width: 34em;
  font-size: var(--sy-t4);
  line-height: 1.75;
  color: var(--sy-mist);
}

.page-about .about-hero__sub {
  margin: 18px 0 0;
  font-size: var(--sy-t5);
  letter-spacing: 0.08em;
  color: var(--sy-gold);
  font-weight: 700;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-jump a {
  display: inline-block;
  padding: 6px 15px;
  border: 1px solid var(--about-rule);
  border-radius: 999px;
  font-size: var(--sy-t5);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  color: var(--sy-mist);
  text-decoration: none;
  transition: color var(--sy-dur) var(--sy-ease), border-color var(--sy-dur) var(--sy-ease),
    background-color var(--sy-dur) var(--sy-ease);
}

.page-about .about-jump a:hover {
  color: var(--sy-deep);
  background: var(--sy-gold);
  border-color: var(--sy-gold);
}

/* 星轨视觉 */
.page-about .about-hero__art {
  position: relative;
}

.page-about .about-orbit {
  position: relative;
  width: min(100%, 400px);
  aspect-ratio: 1 / 1;
  margin-inline: auto;
}

.page-about .about-orbit__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--about-rule);
}

.page-about .about-orbit__ring--1 {
  inset: 0;
}

.page-about .about-orbit__ring--2 {
  inset: 13%;
  border-color: rgba(242, 184, 87, 0.32);
}

.page-about .about-orbit__ring--3 {
  inset: 30%;
  border-style: dashed;
  border-color: var(--about-rule-soft);
}

.page-about .about-orbit__tick {
  position: absolute;
  background: var(--about-rule);
  width: 1px;
  height: 14px;
}

.page-about .about-orbit__tick--a {
  top: 50%;
  left: 0;
  transform: translateY(-50%) rotate(90deg);
  transform-origin: center;
}

.page-about .about-orbit__tick--b {
  top: 50%;
  right: 0;
  transform: translateY(-50%) rotate(90deg);
}

.page-about .about-orbit__dot {
  position: absolute;
  top: 0;
  left: 50%;
  width: 10px;
  height: 10px;
  margin-left: -5px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--sy-gold);
  box-shadow: 0 0 14px var(--sy-gold);
}

.page-about .about-orbit__core {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--sy-font-display);
  font-weight: 200;
  font-size: clamp(56px, 15vw, 96px);
  letter-spacing: -0.04em;
  color: var(--sy-gold);
  opacity: 0.9;
  font-variant-numeric: tabular-nums;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-block: clamp(40px, 7vw, 84px);
}

.page-about .about-chapter--tint {
  background: linear-gradient(180deg, rgba(22, 34, 74, 0.72), rgba(11, 19, 48, 0));
  border-block: 1px solid var(--about-rule-soft);
}

.page-about .about-chapter--last {
  padding-bottom: clamp(52px, 8vw, 104px);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 3vw, 28px);
  align-items: start;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-head__num {
  font-family: var(--sy-font-display);
  font-weight: 200;
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: rgba(242, 184, 87, 0.55);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

.page-about .about-head h2 {
  margin: 8px 0 0;
  font-family: var(--sy-font-display);
  font-weight: 900;
  font-size: var(--sy-t2);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--sy-paper);
  text-wrap: balance;
}

.page-about .about-head__lead {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: var(--sy-t4);
  line-height: 1.75;
  color: var(--sy-mist);
}

.page-about .about-note {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--sy-gold);
  font-size: var(--sy-t5);
  line-height: 1.65;
  color: var(--sy-mist);
}

.page-about .about-note a {
  color: var(--sy-gold);
  text-decoration: none;
  border-bottom: 1px solid var(--about-gold-line, rgba(242, 184, 87, 0.55));
}

.page-about .about-note a:hover {
  color: var(--sy-paper);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--sy-radius-sm);
  border: 1px solid var(--about-rule);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: var(--sy-t5);
  letter-spacing: 0.04em;
  color: rgba(169, 178, 199, 0.85);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(242, 184, 87, 0.6), rgba(42, 53, 87, 0.35));
}

.page-about .about-era {
  position: relative;
  padding-left: 28px;
  scroll-margin-top: calc(var(--sy-topbar) + 24px);
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--sy-deep);
  border: 1px solid var(--about-rule);
  transition: border-color var(--sy-dur) var(--sy-ease), background-color var(--sy-dur) var(--sy-ease),
    box-shadow var(--sy-dur) var(--sy-ease);
}

.page-about .about-era:hover::before,
.page-about .about-era:target::before {
  background: var(--sy-gold);
  border-color: var(--sy-gold);
  box-shadow: 0 0 0 4px var(--about-gold-glow);
}

.page-about .about-era__year {
  display: block;
  font-family: var(--sy-font-display);
  font-weight: 200;
  font-size: clamp(44px, 13vw, 96px);
  line-height: 0.92;
  letter-spacing: -0.04em;
  color: var(--sy-gold);
  opacity: 0.78;
  font-variant-numeric: tabular-nums;
}

.page-about .about-era:target .about-era__year {
  opacity: 1;
}

.page-about .about-era__body h3 {
  margin: 6px 0 10px;
  font-family: var(--sy-font-display);
  font-weight: 800;
  font-size: var(--sy-t3);
  line-height: 1.3;
  color: var(--sy-paper);
}

.page-about .about-era__body p {
  margin: 0 0 8px;
  font-size: var(--sy-t4);
  line-height: 1.75;
  color: var(--sy-mist);
}

/* ---------- 两个栏目 ---------- */
.page-about .about-split {
  display: grid;
  gap: 16px;
}

.page-about .about-pillar {
  padding: clamp(20px, 3.5vw, 32px);
  background: rgba(22, 34, 74, 0.85);
  border: 1px solid var(--about-rule);
  border-radius: var(--sy-radius);
  border-left: 3px solid var(--sy-grid);
}

.page-about .about-pillar--teal {
  border-left-color: var(--sy-teal);
}

.page-about .about-pillar--orange {
  border-left-color: var(--sy-orange);
}

.page-about .about-pillar h3 {
  margin: 14px 0 12px;
  font-family: var(--sy-font-display);
  font-weight: 800;
  font-size: var(--sy-t3);
  line-height: 1.3;
  color: var(--sy-paper);
}

.page-about .about-pillar p {
  margin: 0 0 10px;
  font-size: var(--sy-t4);
  line-height: 1.75;
  color: var(--sy-mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-role__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .about-role__name {
  font-size: var(--sy-t4);
  font-weight: 700;
  color: var(--sy-paper);
}

.page-about .about-role__count {
  font-size: var(--sy-t5);
  letter-spacing: 0.08em;
  color: var(--sy-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__bar {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(42, 53, 87, 0.85);
  overflow: hidden;
}

.page-about .about-role__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 999px;
  transition: filter var(--sy-dur) var(--sy-ease);
}

.page-about .about-role__fill--a {
  --w: 50%;
  background: var(--sy-gold);
}

.page-about .about-role__fill--b {
  --w: 28%;
  background: var(--sy-teal);
}

.page-about .about-role__fill--c {
  --w: 22%;
  background: var(--sy-orange);
}

.page-about .about-role:hover .about-role__fill {
  filter: brightness(1.18);
}

.page-about .about-role__duty {
  margin: 9px 0 0;
  font-size: var(--sy-t5);
  line-height: 1.65;
  color: var(--sy-mist);
}

.page-about .about-figure--team {
  margin-bottom: 0;
}

/* ---------- 产品线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 14px;
}

.page-about .about-line {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  background: rgba(11, 19, 48, 0.7);
  border: 1px solid var(--about-rule);
  border-radius: var(--sy-radius-sm);
  transition: transform var(--sy-dur) var(--sy-ease), border-color var(--sy-dur) var(--sy-ease);
}

.page-about .about-line:hover {
  transform: translateY(-2px);
  border-color: var(--about-gold-line, rgba(242, 184, 87, 0.55));
}

.page-about .about-line__num {
  display: block;
  font-family: var(--sy-font-display);
  font-weight: 200;
  font-size: var(--sy-t3);
  letter-spacing: 0.04em;
  color: rgba(242, 184, 87, 0.7);
  font-variant-numeric: tabular-nums;
}

.page-about .about-line h3 {
  margin: 8px 0 10px;
  font-family: var(--sy-font-display);
  font-weight: 800;
  font-size: var(--sy-t3);
  line-height: 1.3;
  color: var(--sy-paper);
}

.page-about .about-line p {
  margin: 0;
  font-size: var(--sy-t4);
  line-height: 1.75;
  color: var(--sy-mist);
}

/* ---------- 共建 ---------- */
.page-about .about-partners {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-partners__copy p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: var(--sy-t4);
  line-height: 1.75;
  color: var(--sy-mist);
}

.page-about .about-partners__copy p:first-child {
  font-size: clamp(18px, 2.4vw, 21px);
  color: var(--sy-paper);
  line-height: 1.6;
}

.page-about .about-partners__copy a {
  color: var(--sy-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 184, 87, 0.55);
}

.page-about .about-partners__copy a:hover {
  color: var(--sy-paper);
}

.page-about .about-figure--partners {
  margin-bottom: 0;
}

/* ---------- 备案 ---------- */
.page-about .about-record {
  position: relative;
  padding: clamp(20px, 4vw, 40px);
  background: var(--sy-paper);
  color: var(--sy-ink);
  border-radius: var(--sy-radius);
  overflow: hidden;
}

.page-about .about-record__list {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-record__row {
  display: grid;
  grid-template-columns: minmax(72px, 5.5em) minmax(0, 1fr);
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(20, 22, 28, 0.22);
}

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

.page-about .about-record dt {
  font-size: var(--sy-t5);
  letter-spacing: 0.08em;
  color: rgba(20, 22, 28, 0.62);
}

.page-about .about-record dd {
  margin: 0;
  font-size: var(--sy-t4);
  line-height: 1.6;
  color: var(--sy-ink);
  overflow-wrap: anywhere;
}

.page-about .about-record__code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 0.1em;
  font-weight: 600;
}

.page-about .about-record a {
  color: var(--sy-ink);
  text-decoration: none;
  border-bottom: 2px solid rgba(242, 184, 87, 0.9);
}

.page-about .about-record a:hover {
  border-bottom-color: var(--sy-ink);
}

.page-about .about-record__foot {
  margin: 20px 0 0;
  font-size: var(--sy-t5);
  line-height: 1.7;
  color: rgba(20, 22, 28, 0.75);
}

.page-about .about-record::after {
  content: "";
  display: block;
  height: 30px;
  margin-top: 24px;
  border-radius: 2px;
  opacity: 0.7;
  background: repeating-linear-gradient(
    90deg,
    var(--sy-ink) 0 2px,
    transparent 2px 6px,
    var(--sy-ink) 6px 7px,
    transparent 7px 12px,
    var(--sy-ink) 12px 15px,
    transparent 15px 21px
  );
}

/* ---------- 桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-split .about-pillar--orange {
    margin-top: 28px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-line:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-line:nth-child(4) {
    margin-top: 26px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-era {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    padding-left: 40px;
  }

  .page-about .about-timeline::before {
    left: 14px;
  }

  .page-about .about-era::before {
    left: 8px;
    top: 16px;
  }

  .page-about .about-era__year {
    padding-top: 2px;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-hero__art {
    justify-self: end;
    width: 100%;
  }

  .page-about .about-era {
    grid-template-columns: 190px minmax(0, 1fr);
  }

  .page-about .about-era:nth-child(even) .about-era__body {
    margin-left: 24px;
  }

  .page-about .about-chapter--tint .about-lines {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr) minmax(0, 5fr);
  }

  .page-about .about-line:nth-child(2),
  .page-about .about-line:nth-child(4) {
    margin-top: 32px;
  }

  .page-about .about-line:nth-child(3) {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump a,
  .page-about .about-era::before,
  .page-about .about-line,
  .page-about .about-role__fill {
    transition: none;
  }

  .page-about .about-line:hover {
    transform: none;
  }
}

.page-about {
  --about-gold-line: currentColor;
}