.page-about {
  --about-rail-w: 208px;
  --about-ink-soft: rgba(234, 244, 238, 0.82);
  --about-ink-dim: rgba(234, 244, 238, 0.62);
  position: relative;
  color: var(--paper);
  font-family: var(--font-body);
  background:
    radial-gradient(900px 420px at 94% -8%, rgba(87, 242, 193, 0.16), transparent 62%),
    radial-gradient(760px 400px at 2% 46%, rgba(255, 155, 74, 0.09), transparent 66%),
    linear-gradient(180deg, #07271f 0%, #051f1a 44%, #04180f 100%);
  padding-bottom: 56px;
}

.page-about .about-shell {
  padding-top: 22px;
  padding-bottom: 8px;
}

/* ---------- 左侧章节索引 ---------- */
.page-about .about-rail {
  border: 1px solid var(--line);
  background: rgba(10, 46, 38, 0.62);
  padding: 12px 14px 10px;
  margin-bottom: 18px;
}

.page-about .about-rail__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-rail__list a .mono {
  font-size: 11px;
  color: var(--signal);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--signal-soft);
  border-color: var(--signal);
}

.page-about .about-rail__state {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-rail__state .mono {
  font-size: 11px;
  color: var(--signal-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border: 1px solid var(--line);
  background:
    linear-gradient(148deg, rgba(10, 46, 38, 0.95) 0%, rgba(5, 31, 26, 0.78) 58%, rgba(31, 111, 92, 0.3) 100%);
  padding: 16px 16px 22px;
  margin-top: 14px;
  position: relative;
}

.page-about .about-hero__ticker {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-hero__ticker .mono {
  font-size: 11px;
  letter-spacing: 0.12em;
}

.page-about .about-hero__ticker-fill {
  flex: 1 1 auto;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 6px, transparent 6px 12px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 20px;
  margin-top: 16px;
}

.page-about .about-hero__text .eyebrow {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-hero__title {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 8.4vw, 3.8rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 20em;
}

.page-about .about-hero__lead {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
  max-width: 40em;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.page-about .about-hero__meta .chip {
  border: 1px solid var(--line);
  background: rgba(87, 242, 193, 0.07);
  color: var(--signal-soft);
  font-size: 12px;
  padding: 5px 10px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-hero__frame {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  aspect-ratio: 3 / 2;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 88% 100%, 0 100%);
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-hero__frame .media-frame__caption {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-top: 48px;
}

.page-about .about-head {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
}

.page-about .about-head__index {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--signal);
}

.page-about .about-head h2 {
  margin: 2px 0 0;
  font-size: clamp(1.3rem, 5vw, 1.85rem);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-head__note {
  margin-left: auto;
  align-self: flex-end;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .about-cols {
  display: grid;
  gap: 24px;
}

.page-about .about-prose p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--about-ink-soft);
  max-width: 44em;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-lead {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-dim);
  max-width: 42em;
}

/* ---------- 01 品牌档案纸卡 ---------- */
.page-about .about-file {
  position: relative;
  background: var(--paper);
  color: var(--ink);
  padding: 18px 16px 16px;
  border: 1px solid #0d3a2f;
  transform: rotate(-0.35deg);
}

.page-about .about-file::after {
  content: "";
  position: absolute;
  inset: 8px -8px -8px 8px;
  border: 1px solid var(--line);
  transform: rotate(0.7deg);
  z-index: -1;
}

.page-about .about-file__tag {
  margin: 0 0 10px;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: #2f6a56;
  border-bottom: 1px dashed #a9c6b9;
  padding-bottom: 8px;
}

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

.page-about .about-file__list > div {
  display: grid;
  grid-template-columns: 5.2em minmax(0, 1fr);
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px dashed #c3d8cd;
}

.page-about .about-file__list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-file__list dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #4b6b60;
}

.page-about .about-file__list dd {
  margin: 0;
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}

/* ---------- 02 版本时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--signal) 0%, var(--line) 70%, rgba(18, 62, 52, 0.2) 100%);
}

.page-about .about-timeline li {
  position: relative;
  padding: 0 0 24px;
}

.page-about .about-timeline li:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(87, 242, 193, 0.14);
}

.page-about .about-timeline__tag {
  margin: 0 0 4px;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-timeline h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-timeline p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
  max-width: 40em;
}

.page-about .about-version__figure {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.page-about .about-version__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-version__note {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 13px;
  line-height: 1.75;
  color: var(--about-ink-dim);
}

/* ---------- 03 内容条目 ---------- */
.page-about .about-rows {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rows li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px dashed var(--line);
}

.page-about .about-rows li:last-child {
  border-bottom: 1px dashed var(--line);
}

.page-about .about-rows__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .about-rows h3 {
  margin: 0 0 5px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--signal-soft);
}

.page-about .about-rows p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
  max-width: 42em;
}

/* ---------- 04 覆盖数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  border: 1px solid var(--line);
  background: rgba(10, 46, 38, 0.55);
  padding: 13px 12px 12px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-stat:hover {
  border-color: rgba(87, 242, 193, 0.55);
  background: rgba(18, 62, 52, 0.7);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 5.4vw, 1.85rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.page-about .about-stat__unit {
  font-size: 0.56em;
  margin-left: 2px;
  color: var(--signal-soft);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-stat__note {
  display: block;
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px dashed var(--line);
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--about-ink-dim);
  transition: color 0.2s var(--ease);
}

.page-about .about-stat:hover .about-stat__note {
  color: var(--orange);
}

.page-about .about-scenes {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scenes li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-ink-soft);
}

.page-about .about-scenes li::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 9px;
  margin-top: 7px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 0 100%);
}

.page-about .about-scale__frame {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  aspect-ratio: 1 / 1;
}

.page-about .about-scale__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-scale__hint {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--about-ink-dim);
  padding-left: 12px;
  border-left: 2px solid var(--signal);
}

/* ---------- 05 小组展开 ---------- */
.page-about .about-tabs {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-tab {
  border: 1px solid var(--line);
  background: rgba(10, 46, 38, 0.5);
}

.page-about .about-tab summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 15px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tab summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--signal);
}

.page-about .about-tab[open] summary::after {
  content: "–";
}

.page-about .about-tab[open] summary {
  border-bottom: 1px solid var(--line);
  background: rgba(87, 242, 193, 0.06);
}

.page-about .about-tab__idx {
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .about-tab__body {
  margin: 0;
  padding: 14px 15px 16px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 06 选择理由 ---------- */
.page-about .about-why {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-why li {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-why li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-why h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--signal-soft);
}

.page-about .about-why p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
  max-width: 40em;
}

/* ---------- 收束与联系 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 22px;
  margin-top: 52px;
  padding: 22px 18px 24px;
  border: 1px solid var(--line);
  background:
    linear-gradient(140deg, rgba(31, 111, 92, 0.38) 0%, rgba(10, 46, 38, 0.9) 52%, rgba(5, 31, 26, 0.96) 100%);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.5rem, 6vw, 2.2rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__main p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
  max-width: 40em;
}

.page-about .about-cta__links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 8px;
  margin-top: 18px;
}

.page-about .about-cta__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: rgba(5, 31, 26, 0.5);
  color: var(--signal-soft);
  font-size: 14px;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-cta__links a span {
  color: var(--orange);
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  border-color: var(--signal);
  background: rgba(87, 242, 193, 0.1);
}

.page-about .about-contact {
  border: 1px solid var(--line);
  background: rgba(4, 21, 15, 0.42);
  padding: 16px 15px 14px;
}

.page-about .about-contact__title {
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

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

.page-about .about-contact__list > div {
  display: grid;
  grid-template-columns: 4.6em minmax(0, 1fr);
  gap: 10px;
  padding: 6px 0;
}

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

.page-about .about-contact__list dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .about-contact__list dd a {
  color: var(--signal-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(87, 242, 193, 0.35);
}

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

.page-about .about-contact__hint {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--about-ink-dim);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-shell {
    padding-top: 26px;
  }

  .page-about .about-hero {
    padding: 20px 22px 26px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-cta {
    padding: 26px 24px 28px;
  }
}

@media (min-width: 780px) {
  .page-about .about-why {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .about-why li:nth-child(1) {
    border-top: 1px solid var(--line);
  }
}

@media (min-width: 940px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 30px;
    align-items: center;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-head h2 {
    margin-top: 4px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    margin-bottom: 0;
    padding: 16px 16px 14px;
  }

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

  .page-about .about-rail__list li {
    flex: 1 1 auto;
  }

  .page-about .about-rail__list a {
    width: 100%;
    padding: 8px 0 8px 12px;
    border: 0;
    border-left: 1px solid var(--line);
    justify-content: flex-start;
    white-space: normal;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--signal);
    background: rgba(87, 242, 193, 0.06);
  }

  .page-about .about-hero {
    margin-top: 0;
  }

  .page-about .about-section {
    margin-top: 58px;
  }

  .page-about .about-head__index {
    font-size: 40px;
  }
}
<<<END>>>