.page-about {
  --ab-rail-w: 148px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(110% 85% at 86% 4%, rgba(169, 118, 47, .28), transparent 62%),
    radial-gradient(80% 60% at 2% 100%, rgba(46, 139, 122, .16), transparent 60%),
    var(--navy-900);
  padding-block: clamp(52px, 10vw, 100px) clamp(44px, 8vw, 78px);
  overflow: hidden;
}

.page-about .about-hero .crumbs {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: .02em;
}

.page-about .about-hero .crumbs a {
  color: var(--gold-400);
  text-decoration: none;
}

.page-about .about-hero .crumbs a:hover {
  color: var(--gold-300);
}

.page-about .about-hero__inner {
  max-width: 780px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 2.3vw, 17px);
  line-height: 1.85;
  color: rgba(245, 240, 230, .8);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 16px;
  border: 1px solid rgba(169, 118, 47, .42);
  border-radius: var(--radius);
  background: rgba(22, 50, 74, .55);
  box-shadow: var(--shadow-card);
}

.page-about .fact__num {
  font-size: clamp(24px, 4.4vw, 31px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--gold-400);
}

.page-about .fact__lbl {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 发展历程 ---------- */
.page-about .about-stages {
  background: var(--paper);
  color: var(--ink);
  padding-block: clamp(48px, 9vw, 88px);
}

.page-about .about-stages__intro {
  max-width: 720px;
}

.page-about .about-lede {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(15px, 2.2vw, 16px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-stages__band {
  margin: clamp(28px, 5vw, 48px) 0;
  padding: 0;
}

.page-about .about-stages__band img {
  display: block;
  width: 100%;
  height: auto;
  border-block: 1px solid rgba(169, 118, 47, .42);
}

.page-about .about-stages__grid {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  min-width: 0;
}

@media (min-width: 900px) {
  .page-about .about-stages__grid {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .stage-rail {
  position: sticky;
  top: 62px;
  z-index: 3;
  background: var(--paper);
  min-width: 0;
}

.page-about .stage-rail__list {
  list-style: none;
  margin: 0;
  padding: 2px 0 8px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .stage-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .stage-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: border-color .2s var(--ease), color .2s var(--ease), background .2s var(--ease);
}

.page-about .stage-rail__list a .mono {
  font-size: 12px;
  color: var(--gold-600);
}

.page-about .stage-rail__list a:hover,
.page-about .stage-rail__list a:focus-visible {
  border-color: var(--gold-600);
  color: var(--ink);
  background: rgba(217, 166, 90, .14);
}

@media (min-width: 900px) {
  .page-about .stage-rail {
    top: 96px;
    padding-top: 4px;
  }

  .page-about .stage-rail__list {
    flex-direction: column;
    gap: 1px;
    padding: 0;
    overflow: visible;
  }

  .page-about .stage-rail__list a {
    width: 100%;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 8px 10px;
    box-sizing: border-box;
  }

  .page-about .stage-rail__list a:hover,
  .page-about .stage-rail__list a:focus-visible {
    border-left-color: var(--gold-400);
    background: rgba(217, 166, 90, .12);
  }
}

.page-about .stage-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-about .stage {
  scroll-margin-top: 84px;
  min-width: 0;
}

@media (min-width: 900px) {
  .page-about .stage {
    scroll-margin-top: 108px;
  }
}

.page-about .stage__body {
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .62);
}

.page-about .stage__year {
  display: block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-600);
}

.page-about .stage__body h3 {
  margin: 9px 0 10px;
  font-size: clamp(19px, 2.7vw, 24px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .stage__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.page-about .stage__points li {
  position: relative;
  padding-left: 17px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .stage__points li::before {
  content: "";
  position: absolute;
  left: 1px;
  top: .62em;
  width: 6px;
  height: 6px;
  border: 1px solid var(--gold-600);
  transform: rotate(45deg);
}

.page-about .stage--key .stage__body {
  background: var(--navy-800);
  border-color: rgba(169, 118, 47, .62);
  box-shadow: var(--shadow-card);
}

.page-about .stage--key .stage__year {
  color: var(--gold-300);
}

.page-about .stage--key .stage__body h3 {
  color: var(--paper);
}

.page-about .stage--key .stage__body p,
.page-about .stage--key .stage__points li {
  color: rgba(245, 240, 230, .78);
}

.page-about .stage--key .stage__points li::before {
  border-color: var(--gold-300);
}

/* ---------- 团队构成 ---------- */
.page-about .about-team {
  background: var(--navy-800);
  color: var(--paper);
}

.page-about .about-team__banner {
  margin: 0 0 clamp(26px, 5vw, 44px);
  padding: 0;
  border: 1px solid rgba(169, 118, 47, .42);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.page-about .about-team__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-team__intro {
  max-width: 740px;
}

.page-about .about-quality h2,
.page-about .about-compat h2,
.page-about .about-voice h2,
.page-about .about-standard h2,
.page-about .about-team h2 {
  margin: 12px 0 14px;
  font-size: clamp(22px, 4.2vw, 34px);
  line-height: 1.28;
  letter-spacing: -.02em;
}

.page-about .about-team h2 {
  color: var(--paper);
}

.page-about .about-team__intro p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 240, 230, .78);
}

.page-about .team-bar {
  display: flex;
  height: 10px;
  margin: clamp(24px, 4vw, 34px) 0 14px;
  border: 1px solid rgba(169, 118, 47, .34);
  border-radius: 999px;
  overflow: hidden;
  background: rgba(12, 26, 40, .6);
}

.page-about .team-bar__seg {
  display: block;
  height: 100%;
}

.page-about .team-bar__seg--eng { flex: 26 1 0; background: var(--gold-400); }
.page-about .team-bar__seg--doc { flex: 9 1 0; background: var(--jade-600); }
.page-about .team-bar__seg--sup { flex: 7 1 0; background: var(--gold-600); }

.page-about .team-legend {
  list-style: none;
  margin: 0 0 clamp(22px, 4vw, 32px);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .team-legend li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .team-legend i {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.page-about .sw-eng { background: var(--gold-400); }
.page-about .sw-doc { background: var(--jade-600); }
.page-about .sw-sup { background: var(--gold-600); }

.page-about .team-grid {
  display: grid;
  gap: 10px;
}

@media (min-width: 780px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .role {
  padding: 18px;
  border: 1px solid rgba(169, 118, 47, .36);
  border-radius: var(--radius);
  background: rgba(12, 26, 40, .62);
  box-shadow: var(--shadow-card);
  transition: transform .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  transform: translateY(-2px);
  border-color: var(--gold-400);
  box-shadow: var(--shadow-lift);
}

.page-about .role__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 9px;
}

.page-about .role__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold-400);
}

.page-about .role__name {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 240, 230, .72);
}

/* ---------- 质量管理 ---------- */
.page-about .about-quality {
  background: var(--paper);
  color: var(--ink);
}

.page-about .quality-grid {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  min-width: 0;
}

@media (min-width: 920px) {
  .page-about .quality-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

.page-about .quality-copy {
  min-width: 0;
}

.page-about .about-quality h2 {
  color: var(--ink);
}

.page-about .quality-copy > p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .std-list {
  margin: clamp(20px, 4vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .std {
  padding: 15px 16px;
  border-left: 2px solid var(--gold-600);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(255, 255, 255, .66);
}

.page-about .std dt {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 650;
  color: var(--ink);
}

.page-about .std dt .mono {
  padding: 1px 6px;
  border: 1px solid rgba(169, 118, 47, .42);
  border-radius: 2px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--gold-600);
}

.page-about .std dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .quality-figure {
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255, 255, 255, .7);
}

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

/* ---------- 兼容性测试 ---------- */
.page-about .about-compat {
  background: var(--navy-900);
  color: var(--paper);
}

.page-about .compat-copy {
  max-width: 740px;
}

.page-about .about-compat h2 {
  color: var(--paper);
}

.page-about .compat-copy p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 240, 230, .78);
}

.page-about .compat-steps {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

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

@media (min-width: 1060px) {
  .page-about .compat-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .compat-steps li {
  display: flex;
  gap: 12px;
  padding: 16px;
  border: 1px solid rgba(169, 118, 47, .34);
  border-radius: var(--radius);
  background: rgba(22, 50, 74, .5);
  box-shadow: var(--shadow-card);
}

.page-about .compat-steps li > div {
  min-width: 0;
}

.page-about .compat-steps .mono {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gold-300);
}

.page-about .compat-steps h3 {
  margin: 3px 0 6px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .compat-steps p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(245, 240, 230, .7);
}

.page-about .compat-links {
  margin: clamp(20px, 4vw, 30px) 0 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .compat-links a {
  color: var(--gold-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 166, 90, .5);
}

.page-about .compat-links a:hover {
  color: var(--gold-300);
}

/* ---------- 用户口碑 ---------- */
.page-about .about-voice {
  background: var(--paper);
  color: var(--ink);
}

.page-about .voice-copy {
  max-width: 740px;
}

.page-about .about-voice h2 {
  color: var(--ink);
}

.page-about .voice-copy p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .voice-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

@media (min-width: 700px) {
  .page-about .voice-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .voice-stats li {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .72);
}

.page-about .voice-stats .stat-num {
  display: block;
  font-size: clamp(28px, 4.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .voice-stats .stat-unit {
  margin-left: 3px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gold-600);
}

.page-about .voice-stats .stat-lbl {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 服务标准 ---------- */
.page-about .about-standard {
  background: linear-gradient(180deg, var(--navy-900) 0%, var(--navy-800) 100%);
  color: var(--paper);
}

.page-about .about-standard h2 {
  color: var(--paper);
}

.page-about .std-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

@media (min-width: 620px) {
  .page-about .std-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .std-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .std-stats li {
  padding: 18px;
  border: 1px solid rgba(169, 118, 47, .34);
  border-radius: var(--radius);
  background: rgba(12, 26, 40, .55);
  box-shadow: var(--shadow-card);
}

.page-about .std-stats .stat-num {
  display: block;
  font-size: clamp(30px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold-400);
}

.page-about .std-stats .stat-unit {
  margin-left: 3px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gold-600);
}

.page-about .std-stats .stat-lbl {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: clamp(26px, 5vw, 42px);
  padding: clamp(20px, 4vw, 32px);
  border: 1px solid rgba(169, 118, 47, .42);
  border-radius: var(--radius);
  background: rgba(22, 50, 74, .55);
  display: grid;
  gap: 18px;
}

@media (min-width: 820px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

.page-about .about-cta p {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 240, 230, .82);
}

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

.page-about .about-cta__actions .btn {
  white-space: nowrap;
}