.page-about {
  --about-rail-w: 15rem;
  --about-gap: clamp(1.5rem, 3vw, 3rem);
  --about-paper-line: rgba(43, 33, 24, 0.16);
  color: var(--mist);
  background:
    radial-gradient(120% 70% at 88% 0%, rgba(67, 240, 208, 0.08), transparent 62%),
    radial-gradient(90% 60% at 0% 100%, rgba(255, 106, 61, 0.06), transparent 70%),
    var(--ink-900);
  padding: clamp(1rem, 2.4vw, 1.75rem) 0 clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-shell {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
  padding-top: clamp(1rem, 2vw, 1.75rem);
}

/* ---------- 左侧索引栏 ---------- */
.page-about .about-rail {
  display: grid;
  gap: 1.1rem;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-rail__label {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-rail__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.page-about .about-rail__nav a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.42rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--silver);
  font-size: 0.88rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-about .about-rail__nav a .mono {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--faint-text);
}

.page-about .about-rail__nav a:hover,
.page-about .about-rail__nav a:focus-visible {
  border-color: var(--line-cyan);
  background: var(--halo-cyan);
  color: var(--mist);
}

.page-about .about-rail__nav a:hover .mono,
.page-about .about-rail__nav a:focus-visible .mono {
  color: var(--cyan);
}

.page-about .about-rail__note {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  border-radius: var(--radius);
  background: rgba(14, 42, 64, 0.55);
}

.page-about .about-rail__note p {
  margin: 0 0 0.5rem;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--soft-text);
}

.page-about .about-rail__note p.mono {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--signal);
  text-transform: uppercase;
}

.page-about .about-rail__note .btn {
  margin-top: 0.35rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-main {
  min-width: 0;
}

.page-about .about-intro {
  padding-bottom: clamp(1.75rem, 3vw, 2.75rem);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-intro h1 {
  margin: 0.7rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.16;
  letter-spacing: 0.03em;
  color: var(--mist);
  max-width: 22ch;
}

.page-about .about-intro__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.8;
  color: var(--soft-text);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.6rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--silver);
}

.page-about .about-facts .mono {
  font-size: 1rem;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

/* ---------- 区块通用 ---------- */
.page-about .about-section {
  padding-top: clamp(2rem, 3.6vw, 3rem);
}

.page-about .about-section[id] {
  scroll-margin-top: calc(var(--header-h) + 1.25rem);
}

.page-about .about-sec__head {
  margin-bottom: 1.4rem;
}

.page-about .about-sec__index {
  margin: 0 0 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--faint-text);
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-sec__note {
  margin: 0.6rem 0 0;
  font-size: 0.86rem;
  color: var(--faint-text);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9);
}

.page-about .about-figure .media-frame__caption {
  display: block;
  padding: 0.55rem 0.8rem;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--faint-text);
  border-top: 1px solid var(--line);
}

/* ---------- 品牌自述 ---------- */
.page-about .about-identity__grid {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-identity__text p {
  margin: 0 0 1rem;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-identity__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

/* ---------- 呼号体系 ---------- */
.page-about .about-callout {
  border-top: 1px solid var(--line);
  padding-top: clamp(2rem, 3.6vw, 3rem);
}

.page-about .about-callout__grid {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 1.6rem;
}

.page-about .about-callout__text p {
  margin: 0 0 1rem;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-wave-figure {
  margin: 0;
  padding: 1.1rem 1rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(14, 42, 64, 0.9), rgba(7, 26, 43, 0.9));
  box-shadow: var(--shadow-soft);
}

.page-about .about-wave {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-wave__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  opacity: 0.85;
}

.page-about .about-wave__line--ghost {
  stroke: var(--silver);
  opacity: 0.28;
  stroke-dasharray: 5 7;
}

.page-about .about-wave-figure figcaption {
  margin-top: 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--faint-text);
}

.page-about .about-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-columns a {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 42, 64, 0.5);
  text-decoration: none;
  color: var(--mist);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-about .about-columns a:hover,
.page-about .about-columns a:focus-visible {
  border-color: var(--line-cyan);
  background: rgba(67, 240, 208, 0.08);
  transform: translateY(-2px);
}

.page-about .about-columns__idx {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .about-columns__name {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .about-columns__desc {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--soft-text);
}

/* ---------- 发展节点 ---------- */
.page-about .about-timeline-sec {
  border-top: 1px solid var(--line);
}

.page-about .about-timeline {
  margin: 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline > li {
  position: relative;
  padding-bottom: 1.1rem;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.72rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--signal);
  transform: translateX(-50%) rotate(45deg);
  box-shadow: 0 0 0 4px var(--ink-900);
}

.page-about .about-timeline details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 42, 64, 0.42);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-timeline details[open],
.page-about .about-timeline details:hover {
  border-color: var(--line-cyan);
  background: rgba(14, 42, 64, 0.66);
}

.page-about .about-timeline summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.8rem;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline summary:focus-visible {
  outline: 2px solid var(--line-cyan);
  outline-offset: 2px;
}

.page-about .about-timeline__no {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  flex: 1 1 12rem;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-timeline__mark {
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--signal);
  transition: transform 0.2s ease;
}

.page-about .about-timeline details[open] .about-timeline__mark {
  transform: rotate(45deg);
}

.page-about .about-timeline__body {
  margin: 0;
  padding: 0 1rem 1rem;
  max-width: 62ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--soft-text);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  border-top: 1px solid var(--line);
}

.page-about .about-principles__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.page-about .about-principle {
  padding: 1.1rem 1.15rem;
  border-radius: var(--radius);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-principle h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-principle > p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--soft-text);
}

.page-about .about-principle__scene {
  margin-top: 0.7rem !important;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--line-strong);
  font-size: 0.84rem !important;
  color: var(--silver) !important;
}

.page-about .about-principle__scene .mono {
  display: inline-block;
  margin-right: 0.45rem;
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-about .about-principle:hover,
.page-about .about-principle:focus-visible {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
  outline: none;
}

/* ---------- 协作与治理 ---------- */
.page-about .about-governance {
  border-top: 1px solid var(--line);
}

.page-about .about-governance__grid {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-governance__text p {
  margin: 0 0 1rem;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-governance__list {
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-governance__list li {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--soft-text);
}

.page-about .about-governance__list .mono {
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

/* ---------- 品牌数据 ---------- */
.page-about .about-data {
  border-top: 1px solid var(--line);
}

.page-about .about-data__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin: 0;
}

.page-about .about-data__grid > div {
  padding: 1.05rem 1.1rem;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  background: rgba(14, 42, 64, 0.5);
}

.page-about .about-data__grid dt {
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--faint-text);
}

.page-about .about-data__grid dd {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin: 0.45rem 0 0.55rem;
  color: var(--mist);
}

.page-about .about-data__num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--signal);
}

.page-about .about-data__grid dd .mono {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--soft-text);
}

.page-about .about-data__grid p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--soft-text);
}

/* ---------- 结尾引导（纸感面板） ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  padding: clamp(1.3rem, 3vw, 2.2rem);
  border-radius: var(--radius);
}

.page-about .about-cta__inner h2 {
  margin: 0.4rem 0 0.8rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--brown);
}

.page-about .about-cta__inner p {
  margin: 0 0 1.2rem;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--brown);
}

.page-about .about-cta__inner .kicker {
  color: var(--signal);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .about-cta__actions .btn--ghost {
  border-color: var(--about-paper-line);
  color: var(--brown);
}

.page-about .about-cta__actions .btn--ghost:hover,
.page-about .about-cta__actions .btn--ghost:focus-visible {
  border-color: var(--brown);
  color: var(--brown);
  background: rgba(43, 33, 24, 0.06);
}

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

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

@media (min-width: 760px) {
  .page-about .about-identity__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-callout__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .page-about .about-governance__grid {
    grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
    align-items: start;
  }

  .page-about .about-principles__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .about-principle__scene {
    max-height: 0;
    margin-top: 0 !important;
    padding-top: 0;
    overflow: hidden;
    opacity: 0;
    border-top-color: transparent;
    transition: max-height 0.28s ease, opacity 0.28s ease, padding-top 0.28s ease, margin-top 0.28s ease;
  }

  .page-about .about-principle:hover .about-principle__scene,
  .page-about .about-principle:focus-visible .about-principle__scene,
  .page-about .about-principle:focus-within .about-principle__scene {
    max-height: 9rem;
    margin-top: 0.7rem !important;
    padding-top: 0.7rem;
    opacity: 1;
    border-top-color: var(--line-strong);
  }
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.25rem);
    padding-top: 1.1rem;
  }

  .page-about .about-rail__nav {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.2rem;
  }

  .page-about .about-rail__nav a {
    display: flex;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 0.5rem 0.85rem;
  }

  .page-about .about-rail__nav a:hover,
  .page-about .about-rail__nav a:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(67, 240, 208, 0.12), transparent 85%);
  }
}

@media (min-width: 1100px) {
  .page-about .about-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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