.page-about{
  overflow-x: clip;
  background: var(--color-ink-900);
}

.page-about img{
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .about-breadcrumb{
  padding-top: calc(var(--header-h) + 16px);
}
.page-about .about-breadcrumb .breadcrumb{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .8125rem;
  color: var(--color-mist);
}
.page-about .about-breadcrumb a{
  color: var(--color-mist);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}
.page-about .about-breadcrumb a:hover{
  color: var(--color-neon);
}
.page-about .about-breadcrumb .sep{
  color: rgba(255,255,255,.3);
}
.page-about .about-breadcrumb [aria-current="page"]{
  color: var(--color-fog);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  overflow: hidden;
  border-bottom: var(--border-line);
  background:
    radial-gradient(ellipse at 78% 12%, rgba(168,70,255,.16), transparent 50%),
    linear-gradient(135deg, var(--color-ink-900) 0%, var(--color-ink-800) 62%, var(--color-ink-900) 100%);
}
.page-about .about-hero::before{
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, transparent 46%, rgba(168,70,255,.09) 46%, rgba(168,70,255,.09) 48.5%, transparent 48.5%),
    repeating-linear-gradient(-58deg, rgba(57,255,20,.035) 0 1px, transparent 1px 13px);
  pointer-events: none;
}
.page-about .about-hero-inner{
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
  padding-top: 32px;
  padding-bottom: 56px;
}
.page-about .about-hero-copy{
  max-width: 760px;
}
.page-about .about-hero-copy .display-title{
  letter-spacing: -0.03em;
}
.page-about .about-hero .section-kicker{
  margin-bottom: 16px;
}
.page-about .about-hero-lead{
  max-width: 600px;
  margin-top: 18px;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-fog);
}
.page-about .about-hero-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ---------- 路线预览卡 ---------- */
.page-about .about-hero-preview{
  max-width: 420px;
}
.page-about .about-route-card{
  border: var(--border-line);
  border-radius: var(--radius-md);
  background: rgba(11,30,51,.72);
  box-shadow: var(--shadow-soft);
  padding: 20px 20px 22px;
}
.page-about .about-route-head{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: var(--border-line);
  font-family: var(--font-data);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-neon);
}
.page-about .about-route-coord{
  color: var(--color-electric);
}
.page-about .about-route-list{
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-route-list a{
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-left: 22px;
  color: var(--color-fog);
  font-size: .9375rem;
  line-height: 1.6;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}
.page-about .about-route-list a::before{
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  border-radius: 2px;
  border: 1px solid var(--color-electric);
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.page-about .about-route-list a:hover{
  color: var(--color-neon);
  padding-left: 26px;
}
.page-about .about-route-list a:hover::before{
  background: var(--color-neon);
  border-color: var(--color-neon);
}

/* ---------- 章节公共头部 ---------- */
.page-about .about-section-top{
  display: grid;
  gap: 14px;
  margin-bottom: 36px;
}
.page-about .about-section-top .section-head{
  display: grid;
  gap: 10px;
}
.page-about .about-section-top .section-title{
  margin: 0;
}
.page-about .about-section-top .section-desc{
  margin: 0;
  max-width: 720px;
  color: var(--color-mist);
  line-height: 1.7;
}

/* ---------- 升级历程 ---------- */
.page-about .about-upgrade{
  background: linear-gradient(180deg, var(--color-ink-900), var(--color-ink-800));
  border-bottom: var(--border-line);
}
.page-about .about-upgrade-grid{
  display: grid;
  gap: 28px;
}
.page-about .about-ui-compare{
  border-radius: var(--radius-md);
  border: 1px solid rgba(168,70,255,.25);
  overflow: hidden;
  background: var(--color-black);
}
.page-about .about-ui-compare img{
  display: block;
  width: 100%;
}
.page-about .about-figcaption{
  margin: 0;
  padding: 10px 14px;
  font-size: .8125rem;
  color: var(--color-mist);
  border-top: var(--border-line);
  background: rgba(19,42,69,.35);
}
.page-about .about-upgrade-prose{
  display: grid;
  gap: 16px;
}
.page-about .about-upgrade-prose p{
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-mist);
}
.page-about .about-upgrade-prose p strong{
  color: var(--color-fog);
}
.page-about .about-fact-row{
  display: grid;
  gap: 10px;
  margin-top: 6px;
}
.page-about .about-fact-item{
  display: inline-flex;
  align-items: flex-start;
  gap: 10px;
  border: var(--border-line);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: .875rem;
  color: var(--color-mist);
  background: rgba(168,70,255,.06);
}
.page-about .about-fact-item strong{
  color: var(--color-neon);
  font-family: var(--font-data);
  letter-spacing: .04em;
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-milestones{
  background: linear-gradient(180deg, var(--color-ink-800), var(--color-black) 35%, var(--color-ink-900));
  border-bottom: var(--border-line);
}
.page-about .about-milestone-layout{
  display: grid;
  gap: 36px;
}
.page-about .about-timeline{
  position: relative;
  margin: 0;
  padding: 4px 0 0;
  list-style: none;
}
.page-about .about-timeline::before{
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--color-neon), rgba(168,70,255,.45));
}
.page-about .about-timeline-item{
  position: relative;
  padding: 0 0 34px 34px;
}
.page-about .about-timeline-item:last-child{
  padding-bottom: 0;
}
.page-about .about-timeline-item::before{
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--color-neon);
  background: var(--color-ink-900);
  box-shadow: 0 0 0 4px rgba(57,255,20,.12), 0 0 14px rgba(57,255,20,.35);
}
.page-about .about-timeline-year{
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-data);
  font-size: .8125rem;
  letter-spacing: .14em;
  color: var(--color-neon);
}
.page-about .about-timeline-body h3{
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 1.1875rem;
  color: var(--color-fog);
}
.page-about .about-timeline-body p{
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--color-mist);
}
.page-about .about-timeline-tag{
  display: inline-block;
  margin-top: 12px;
  padding: 4px 12px;
  font-family: var(--font-data);
  font-size: .6875rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-electric);
  border: 1px solid rgba(168,70,255,.35);
  border-radius: 999px;
}
.page-about .about-milestone-stats{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.page-about .about-stat-card{
  border: var(--border-line);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  background: linear-gradient(145deg, rgba(19,42,69,.55), rgba(11,30,51,.85));
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}
.page-about .about-stat-card:hover{
  transform: translateY(-3px);
  border-color: rgba(57,255,20,.35);
}
.page-about .about-stat-card .stat-value{
  display: block;
  font-family: var(--font-data);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-neon);
  line-height: 1.2;
}
.page-about .about-stat-card .stat-label{
  display: block;
  margin-top: 8px;
  font-size: .8125rem;
  color: var(--color-mist);
  line-height: 1.5;
}

/* ---------- 服务理念 ---------- */
.page-about .about-philosophy{
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--color-ink-900) 0%, var(--color-ink-800) 100%);
  border-bottom: var(--border-line);
}
.page-about .about-philosophy-inner{
  display: grid;
  gap: 32px;
}
.page-about .about-philosophy-art{
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: var(--border-line);
}
.page-about .about-philosophy-art::after{
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, transparent 46%, rgba(57,255,20,.14) 46%, rgba(57,255,20,.14) 48.5%, transparent 48.5%),
    linear-gradient(0deg, rgba(11,30,51,.4), rgba(11,30,51,.12));
}
.page-about .about-philosophy-art img{
  display: block;
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.page-about .about-philosophy-copy{
  position: relative;
}
.page-about .about-philosophy-head{
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.page-about .about-philosophy-head .chapter-num{
  font-size: 3rem;
  line-height: 1;
}
.page-about .about-philosophy-head .section-kicker{
  margin: 0;
}
.page-about .about-philosophy-title{
  margin: 0 0 18px;
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 8vw, 5.2rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--color-fog);
}
.page-about .about-philosophy-accent{
  color: var(--color-neon);
  text-shadow: 0 0 24px rgba(57,255,20,.32);
}
.page-about .about-philosophy-lead{
  margin: 0 0 14px;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-fog);
}
.page-about .about-philosophy-text{
  margin: 0 0 20px;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--color-mist);
}
.page-about .about-principle-list{
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-principle-item{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: .9375rem;
  color: var(--color-fog);
}
.page-about .about-principle-item .legend-dot{
  flex: none;
}

/* ---------- 数据安全与认证 ---------- */
.page-about .about-certification{
  background: linear-gradient(180deg, var(--color-black), var(--color-ink-800) 45%, var(--color-ink-900));
  border-bottom: var(--border-line);
}
.page-about .about-cert-grid{
  display: grid;
  gap: 16px;
}
.page-about .about-cert-badge{
  position: relative;
  display: grid;
  gap: 10px;
  border: var(--border-line);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  background: linear-gradient(145deg, rgba(19,42,69,.55), rgba(11,30,51,.92));
  overflow: hidden;
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
.page-about .about-cert-badge::after{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(168,70,255,.7), transparent);
}
.page-about .about-cert-badge:hover{
  transform: translateY(-4px);
  border-color: rgba(57,255,20,.4);
  box-shadow: var(--shadow-soft);
}
.page-about .about-cert-badge:hover .about-cert-desc{
  color: var(--color-fog);
}
.page-about .about-cert-icon{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-width: 54px;
  height: 34px;
  padding: 0 10px;
  border-radius: 8px;
  border: 1px solid rgba(168,70,255,.45);
  font-family: var(--font-data);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--color-electric);
  background: rgba(168,70,255,.08);
}
.page-about .about-cert-title-line{
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  color: var(--color-fog);
}
.page-about .about-cert-desc{
  margin: 0;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--color-mist);
}
.page-about .about-cert-badge.is-purple .about-cert-icon{
  border-color: rgba(168,70,255,.5);
  color: var(--color-electric);
  background: rgba(168,70,255,.08);
}
.page-about .about-cert-badge.is-green .about-cert-icon{
  border-color: rgba(57,255,20,.45);
  color: var(--color-neon);
  background: rgba(57,255,20,.06);
}
.page-about .about-cert-badge.is-amber .about-cert-icon{
  border-color: rgba(255,193,7,.45);
  color: var(--color-amber);
  background: rgba(255,193,7,.07);
}
.page-about .about-cert-badge.is-fog .about-cert-icon{
  border-color: rgba(230,237,243,.34);
  color: var(--color-fog);
  background: rgba(230,237,243,.06);
}

/* ---------- 团队与伙伴 ---------- */
.page-about .about-team{
  background: linear-gradient(180deg, var(--color-ink-900), var(--color-ink-800));
}
.page-about .about-team-grid{
  display: grid;
  gap: 28px;
}
.page-about .about-team-photo img{
  display: block;
  width: 100%;
  border-radius: var(--radius-md);
  border: var(--border-line);
  box-shadow: var(--shadow-soft);
}
.page-about .about-team-copy{
  display: grid;
  gap: 16px;
}
.page-about .about-team-copy p{
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--color-mist);
}
.page-about .about-team-copy .btn{
  justify-self: start;
  margin-top: 4px;
}

/* ---------- 底部下一站 ---------- */
.page-about .about-next{
  border-top: var(--border-line);
  background: var(--color-ink-900);
}
.page-about .about-next-inner{
  display: grid;
  gap: 8px;
  padding-top: 40px;
  padding-bottom: 56px;
}
.page-about .about-next-kicker{
  margin: 0;
  font-family: var(--font-data);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-mist);
}
.page-about .about-next-link{
  display: inline-flex;
  align-items: center;
  gap: 14px;
  width: fit-content;
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 3vw, 2rem);
  color: var(--color-fog);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), gap var(--t-fast) var(--ease);
}
.page-about .about-next-link::after{
  content: "→";
  color: var(--color-neon);
  font-family: var(--font-data);
}
.page-about .about-next-link:hover{
  color: var(--color-neon);
  gap: 20px;
}

/* ---------- 平板断点 ---------- */
@media (min-width: 720px){
  .page-about .about-hero-inner{
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
    gap: 24px;
  }
  .page-about .about-hero-preview{
    max-width: none;
    margin-top: 8px;
  }
  .page-about .about-upgrade-grid{
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }
  .page-about .about-cert-grid{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-philosophy-inner{
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
  .page-about .about-philosophy-art img{
    height: 360px;
  }
}

/* ---------- 桌面断点 ---------- */
@media (min-width: 1024px){
  .page-about .about-milestone-layout{
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
  }
  .page-about .about-milestone-stats{
    grid-template-columns: 1fr 1fr;
    align-content: start;
  }
  .page-about .about-cert-grid{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-team-grid{
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
    gap: 44px;
  }
  .page-about .about-fact-row{
    grid-template-columns: 1fr 1fr;
  }
}