.page-about {
  --about-rail: 212px;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .breadcrumbs {
  margin-top: clamp(14px, 2.2vw, 26px);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.8vw, 32px);
  margin-top: clamp(16px, 2.4vw, 28px);
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 52px);
    align-items: start;
  }
}

/* ---------- 侧边品牌轨道 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail-inner {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(22, 53, 77, .5), rgba(7, 21, 33, .88));
  box-shadow: inset 0 1px 0 rgba(215, 166, 74, .16);
  padding: 12px 12px 10px;
}

@media (min-width: 960px) {
  .page-about .about-rail-inner {
    position: sticky;
    top: 96px;
    padding: 20px 16px 18px;
  }
}

.page-about .rail-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .rail-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

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

.page-about .rail-nav a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  color: var(--silver);
  font-size: .8125rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color .16s var(--ease), background .16s var(--ease), border-color .16s var(--ease);
}

.page-about .rail-nav .rnum {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .06em;
  color: var(--gold);
  transition: color .16s var(--ease);
}

.page-about .rail-nav a:hover,
.page-about .rail-nav a:focus-visible {
  color: var(--ink-900);
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .rail-nav a:hover .rnum,
.page-about .rail-nav a:focus-visible .rnum {
  color: var(--ink-900);
}

@media (min-width: 960px) {
  .page-about .rail-nav {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-nav a {
    border-radius: var(--r-sm);
    border-color: transparent;
    padding: 8px 10px;
  }

  .page-about .rail-nav a:hover,
  .page-about .rail-nav a:focus-visible {
    color: var(--text);
    background: rgba(215, 166, 74, .12);
    border-color: var(--line-gold);
  }

  .page-about .rail-nav a:hover .rnum,
  .page-about .rail-nav a:focus-visible .rnum {
    color: var(--amber);
  }
}

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

@media (min-width: 960px) {
  .page-about .rail-foot {
    display: grid;
    gap: 6px;
    margin-top: 14px;
    padding-top: 12px;
    border-top: 1px solid var(--line-soft);
  }

  .page-about .rail-foot a {
    font-size: .75rem;
    letter-spacing: .02em;
    color: var(--silver);
    text-decoration: none;
    transition: color .16s var(--ease);
  }

  .page-about .rail-foot a:hover {
    color: var(--amber);
  }
}

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

.page-about .hero-grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

@media (min-width: 880px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .82fr);
    align-items: start;
  }
}

.page-about .hero-title {
  margin: .35em 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.8vw, 3rem);
  line-height: 1.18;
  letter-spacing: -.02em;
  font-weight: 700;
  color: var(--text);
}

.page-about .hero-lead {
  margin: 1em 0 0;
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

@media (min-width: 620px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .hero-stats li {
  background: linear-gradient(180deg, rgba(12, 32, 50, .92), rgba(7, 21, 33, .96));
  padding: 14px 12px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  line-height: 1.1;
  color: var(--gold-soft);
}

.page-about .stat-num small {
  font-size: .5em;
  margin-left: 2px;
  color: var(--silver);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: .75rem;
  line-height: 1.5;
  letter-spacing: .03em;
  color: var(--silver);
}

.page-about .hero-panel {
  border-radius: var(--r-lg);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .panel-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .track {
  display: block;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(7, 21, 33, .55);
  text-decoration: none;
  transition: transform .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}

.page-about .track + .track {
  margin-top: 10px;
}

.page-about .track:hover,
.page-about .track:focus-visible {
  transform: translateY(-2px);
  background: rgba(22, 53, 77, .7);
}

.page-about .track--welcome {
  border-color: var(--line-gold);
}

.page-about .track-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .9375rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: 0 0 auto;
}

.page-about .track--welcome .dot {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 163, 58, .16);
}

.page-about .track--library .dot {
  background: var(--silver);
  box-shadow: 0 0 0 4px rgba(185, 196, 206, .14);
}

.page-about .track-desc {
  display: block;
  margin-top: 6px;
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .panel-foot {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: .8125rem;
  color: var(--silver);
}

.page-about .panel-foot a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 163, 58, .4);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  margin-top: clamp(40px, 6vw, 82px);
  scroll-margin-top: 100px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.015em;
}

.page-about .section-lead {
  color: var(--silver);
  line-height: 1.85;
}

/* ---------- 品牌起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(18px, 2.4vw, 26px);
}

@media (min-width: 820px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }
}

.page-about .origin-text p {
  margin: 0 0 1em;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .situation {
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(22, 53, 77, .55), rgba(7, 21, 33, .75));
  padding: 18px;
}

.page-about .situation h3 {
  margin: 0 0 12px;
  font-size: .9375rem;
  letter-spacing: .02em;
  color: var(--gold-soft);
}

.page-about .situation ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .situation li {
  position: relative;
  padding-left: 16px;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .situation li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--gold);
  opacity: .75;
}

.page-about .situation a {
  display: inline-block;
  margin-top: 12px;
  font-size: .8125rem;
  color: var(--amber);
  text-decoration: none;
}

.page-about .situation a:hover {
  text-decoration: underline;
}

/* ---------- 团队 ---------- */
.page-about .team-top {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(18px, 2.4vw, 26px);
}

@media (min-width: 840px) {
  .page-about .team-top {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

.page-about .media-frame {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(160deg, rgba(22, 53, 77, .6), rgba(7, 21, 33, .9));
}

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

.page-about .media-caption {
  padding: 10px 14px;
  font-size: .75rem;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--silver);
  border-top: 1px solid var(--line-soft);
}

.page-about .version-figure {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
}

.page-about .team-note h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  letter-spacing: .02em;
  color: var(--gold-soft);
}

.page-about .team-note p {
  margin: 0 0 .9em;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-about .role-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(16px, 2.2vw, 24px);
}

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

@media (min-width: 1080px) {
  .page-about .role-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .role-card {
  position: relative;
  padding: 22px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background:
    linear-gradient(180deg, rgba(242, 232, 213, .07), rgba(242, 232, 213, 0) 46%),
    linear-gradient(180deg, rgba(12, 32, 50, .96), rgba(7, 21, 33, .98));
  box-shadow: inset 0 1px 0 rgba(242, 232, 213, .07), 0 16px 28px -22px var(--shadow);
}

.page-about .role-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  border-radius: var(--r-md) var(--r-md) 0 0;
  background: linear-gradient(90deg, var(--gold), rgba(215, 166, 74, 0));
}

.page-about .role-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .role-title {
  margin: .55em 0 0;
  font-size: 1rem;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .role-count {
  margin: .4em 0 .7em;
  font-family: var(--font-mono);
  font-size: 1.65rem;
  line-height: 1;
  color: var(--amber);
}

.page-about .role-count span {
  margin-left: 3px;
  font-size: .5em;
  color: var(--silver);
}

.page-about .role-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 7px;
}

.page-about .role-list li {
  position: relative;
  padding-left: 14px;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .role-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--gold);
  opacity: .75;
}

/* ---------- 双版本 ---------- */
.page-about .version-layout {
  display: grid;
  gap: 14px;
  margin-top: clamp(16px, 2.2vw, 24px);
}

@media (min-width: 900px) {
  .page-about .version-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .version-track {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(12, 32, 50, .95), rgba(7, 21, 33, .98));
}

.page-about .version-track--welcome {
  border-top: 3px solid var(--amber);
}

.page-about .version-track--library {
  border-top: 3px solid var(--silver);
}

.page-about .track-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
}

.page-about .version-track h3 {
  margin: 12px 0 8px;
  font-size: 1.0625rem;
  color: var(--text);
}

.page-about .version-track > p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .version-facts {
  margin: 16px 0 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 8px;
}

.page-about .version-facts li {
  position: relative;
  padding-left: 15px;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .version-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 6px;
  height: 1px;
  background: var(--gold);
}

.page-about .version-facts .mono {
  color: var(--gold-soft);
  margin-right: 2px;
}

.page-about .version-link {
  display: inline-block;
  margin-top: 16px;
  font-size: .8125rem;
  letter-spacing: .02em;
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 163, 58, .38);
}

.page-about .version-link:hover {
  color: var(--gold-soft);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--amber), var(--gold) 45%, rgba(185, 196, 206, .28));
}

.page-about .tl-item {
  position: relative;
  padding-left: 34px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 163, 58, .12);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .12em;
  color: var(--gold-soft);
}

.page-about .tl-body h3 {
  margin: .3em 0 .3em;
  font-size: .9688rem;
  color: var(--text);
}

.page-about .tl-body p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.78;
  color: var(--silver);
}

@media (min-width: 760px) {
  .page-about .tl-item {
    display: grid;
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 18px;
    padding-left: 30px;
    align-items: start;
  }

  .page-about .tl-body h3 {
    margin-top: 0;
  }
}

/* ---------- 覆盖与协作 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

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

  .page-about .reach-cell--wide {
    grid-column: span 2;
  }
}

@media (min-width: 1000px) {
  .page-about .reach-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .reach-cell--wide {
    grid-column: span 2;
  }

  .page-about .reach-cell--note {
    grid-column: span 3;
    display: grid;
    grid-template-columns: minmax(0, auto) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-about .reach-cell {
  padding: clamp(16px, 2.2vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(12, 32, 50, .95), rgba(7, 21, 33, .98));
}

.page-about .reach-cell--wide {
  background:
    radial-gradient(circle at 88% 12%, rgba(215, 166, 74, .18), transparent 58%),
    linear-gradient(160deg, rgba(22, 53, 77, .8), rgba(7, 21, 33, .98));
  border-color: var(--line-gold);
}

.page-about .reach-cell--note {
  background:
    radial-gradient(circle at 12% 90%, rgba(185, 196, 206, .16), transparent 60%),
    linear-gradient(160deg, rgba(12, 32, 50, .95), rgba(7, 21, 33, .98));
}

.page-about .reach-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1.1;
  color: var(--gold-soft);
}

.page-about .reach-num span {
  display: block;
  margin-top: 6px;
  font-family: var(--font-sans);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--silver);
}

.page-about .reach-flag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .12em;
  color: var(--ember);
}

.page-about .reach-text {
  margin: 12px 0 0;
  font-size: .875rem;
  line-height: 1.78;
  color: var(--silver);
}

@media (min-width: 1000px) {
  .page-about .reach-cell--note .reach-text {
    margin-top: 0;
  }
}

/* ---------- 质检 ---------- */
.page-about .quality-layout {
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
  margin-top: clamp(18px, 2.4vw, 26px);
}

@media (min-width: 900px) {
  .page-about .quality-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

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

.page-about .check-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(12, 32, 50, .62);
}

.page-about .check-idx {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .check-list h3 {
  margin: 0 0 4px;
  font-size: .9375rem;
  color: var(--text);
}

.page-about .check-list p {
  margin: 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .cadence {
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--line-gold);
  border-radius: var(--r-lg);
  background:
    radial-gradient(circle at 90% 8%, rgba(242, 163, 58, .14), transparent 60%),
    linear-gradient(180deg, rgba(22, 53, 77, .72), rgba(7, 21, 33, .96));
}

.page-about .cadence-title {
  margin: 0 0 12px;
  font-size: .9375rem;
  letter-spacing: .06em;
  color: var(--gold-soft);
}

.page-about .cadence ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .cadence li {
  font-size: .875rem;
  line-height: 1.7;
  color: var(--text);
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .cadence li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .cadence .mono {
  display: inline-block;
  min-width: 4.4em;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-about .cadence-note {
  margin: 14px 0 16px;
  font-size: .8125rem;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(40px, 6vw, 78px);
  padding: clamp(22px, 3.4vw, 38px);
  border: 1px solid var(--line-gold);
  border-radius: var(--r-lg);
  background:
    radial-gradient(circle at 82% 6%, rgba(215, 166, 74, .2), transparent 62%),
    linear-gradient(150deg, rgba(22, 53, 77, .85), rgba(7, 21, 33, .98));
  display: grid;
  gap: 16px;
}

@media (min-width: 860px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px 28px;
  }

  .page-about .cta-contact {
    grid-column: 1 / -1;
  }
}

.page-about .cta-copy h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  line-height: 1.25;
  color: var(--text);
}

.page-about .cta-copy p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .cta-contact {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .75rem;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--silver);
}