.page-about {
  --about-rail-w: 216px;
  --about-gap: clamp(24px, 4vw, 56px);
  background: var(--ink);
  color: var(--silver);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 4vw, 48px) 0 clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 110% at 6% 0%, rgba(19, 42, 36, 0.92) 0%, rgba(13, 17, 16, 0) 62%),
    linear-gradient(180deg, var(--ink-3) 0%, var(--ink) 100%);
  overflow: hidden;
}

.page-about .about-hero__frame {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
  padding: clamp(22px, 3.6vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(158deg, rgba(19, 42, 36, 0.58), rgba(13, 17, 16, 0.28));
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--gold);
  opacity: 0.65;
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--radius-lg);
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
  border-bottom-right-radius: var(--radius-lg);
}

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

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(38px, 6.4vw, 84px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-hero__facts {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  background: rgba(13, 17, 16, 0.78);
}

.page-about .about-fact__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-fact__value {
  margin: 0;
  font-size: 15px;
  color: var(--mineral);
}

.page-about .about-fact__num {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--gold-lt);
  margin-right: 4px;
}

@media (min-width: 960px) {
  .page-about .about-hero__frame {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: end;
  }
}

/* ---------- 布局骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(32px, 5vw, 60px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .about-rail__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-gold) 0%, var(--line-strong) 45%, transparent 100%);
}

.page-about .about-rail__item {
  position: relative;
  padding-left: 26px;
}

.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-pill);
  background: var(--ink);
  transition: background 150ms var(--ease), border-color 150ms var(--ease);
}

.page-about .about-rail__item:hover::before,
.page-about .about-rail__item:focus-within::before {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-rail__link {
  display: block;
  padding: 8px 0 12px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--silver);
  text-decoration: none;
  transition: color 150ms var(--ease);
}

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

.page-about .about-rail__num {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    padding-right: 8px;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(34px, 5vw, 64px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 32px);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-section__eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 3.4vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--bone);
}

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

.page-about .about-text p {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--silver);
}

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

.page-about .about-text a {
  color: var(--gold-lt);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

.page-about .about-text a:hover,
.page-about .about-text a:focus-visible {
  color: var(--bone);
  border-color: var(--gold);
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 44px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-split--origin {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-split--partners {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(0.84);
}

.page-about .about-figure--banner {
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .about-figure--banner img {
  aspect-ratio: 16 / 9;
}

@media (min-width: 900px) {
  .page-about .about-figure--banner img {
    aspect-ratio: 21 / 9;
  }
}

.page-about .about-figure__caption,
.page-about .about-chart__caption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 12px 18px;
  border-top: 1px solid var(--line-soft);
  background: rgba(19, 42, 36, 0.42);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .about-chart__caption {
  border-top: 1px solid var(--line-soft);
  justify-content: flex-start;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ---------- 版本卡片 ---------- */
.page-about .about-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0 0 clamp(26px, 4vw, 42px);
  padding: 0;
  list-style: none;
}

@media (min-width: 820px) {
  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-version {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(166deg, rgba(19, 42, 36, 0.88), rgba(13, 17, 16, 0.62));
  transition: transform 150ms var(--ease), border-color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.page-about .about-version:hover {
  transform: translateY(-4px);
  border-color: var(--line-gold);
  box-shadow: var(--lift);
}

.page-about .about-version__num {
  margin: 16px 0 4px;
  font-family: var(--font-display);
  font-size: clamp(34px, 4vw, 46px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-version__name {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--gold-lt);
}

.page-about .about-version__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--silver);
}

/* ---------- 图表 ---------- */
.page-about .about-chart {
  margin: 0 0 clamp(26px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(10, 15, 14, 0.62);
  overflow: hidden;
}

.page-about .about-chart__svg {
  display: block;
  width: 100%;
  height: auto;
  padding: clamp(16px, 2.6vw, 26px) clamp(12px, 2.4vw, 26px);
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 860px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-role {
  height: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(19, 42, 36, 0.42);
  transition: border-color 150ms var(--ease), background 150ms var(--ease), transform 150ms var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role[open] {
  border-color: var(--line-gold);
  background: rgba(19, 42, 36, 0.76);
  transform: translateY(-4px);
}

.page-about .about-role__summary {
  display: grid;
  gap: 8px;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-role__summary:focus-visible {
  outline: 2px solid var(--gold-lt);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.page-about .about-role__hint {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .about-role__body {
  padding: 0 18px 20px;
  border-top: 1px solid var(--line-soft);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .about-role__body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--silver);
}

.page-about .about-role__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--clay);
}

/* ---------- 现状 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: clamp(24px, 3.5vw, 36px);
}

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(19, 42, 36, 0.8), rgba(13, 17, 16, 0.5));
}

.page-about .about-stat__num {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: clamp(34px, 4.4vw, 52px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-stat__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold-lt);
}

.page-about .about-stat__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: about-scene;
}

@media (min-width: 880px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-scene {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(13, 17, 16, 0.6);
  transition: border-color 150ms var(--ease), transform 150ms var(--ease);
}

.page-about .about-scene:hover {
  border-color: var(--line-gold);
  transform: translateY(-4px);
}

.page-about .about-scene__num {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold-lt);
}

.page-about .about-scene__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .about-scene p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--silver);
}

.page-about .about-scene a {
  color: var(--gold-lt);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-scene a:hover,
.page-about .about-scene a:focus-visible {
  color: var(--bone);
  border-color: var(--gold);
}

/* ---------- 尾段 ---------- */
.page-about .about-next {
  margin-top: clamp(44px, 6vw, 78px);
}

.page-about .about-next__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(24px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(148deg, rgba(19, 42, 36, 0.9), rgba(13, 17, 16, 0.55)),
    radial-gradient(90% 120% at 92% 0%, rgba(201, 162, 39, 0.1), transparent 60%);
  position: relative;
  overflow: hidden;
}

.page-about .about-next__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 78px;
  height: 3px;
  background: var(--gold);
}

.page-about .about-next__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-next__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--bone);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.76;
  color: var(--silver);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

@media (min-width: 900px) {
  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-next__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ---------- 触屏与动效降级 ---------- */
@media (hover: none) {
  .page-about .about-role {
    background: rgba(19, 42, 36, 0.7);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-role,
  .page-about .about-scene {
    transition: none;
  }

  .page-about .about-version:hover,
  .page-about .about-role:hover,
  .page-about .about-role[open],
  .page-about .about-scene:hover {
    transform: none;
  }
}