.page-about{
  --about-panel: rgba(22,50,92,.55);
  --about-glow-green: rgba(57,255,20,.15);
  --about-glow-orange: rgba(255,107,0,.14);
  --about-line: rgba(168,192,224,.28);
  background: var(--c-deep);
  color: var(--c-text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumb{
  margin: 0 auto;
  max-width: var(--container-w);
  padding: calc(var(--header-h) + 28px) var(--page-gutter) 0;
  position: relative;
  z-index: 2;
}
.page-about .breadcrumb a{ color: var(--c-neon); text-decoration: none; font-weight: 700; }
.page-about .breadcrumb a:hover{ color: var(--c-orange); }
.page-about .breadcrumb [aria-current="page"]{ color: var(--c-text-secondary); }

/* === 01 封面宣言 === */
.about-cover{
  position: relative;
  padding: clamp(2rem, 4vw, 4rem) var(--page-gutter) clamp(3rem, 7vw, 7rem);
  background:
    radial-gradient(1200px 600px at 85% 10%, var(--about-glow-green), transparent 60%),
    radial-gradient(900px 500px at 10% 90%, var(--about-glow-orange), transparent 55%),
    linear-gradient(135deg, var(--c-deep) 0%, var(--c-deep-light) 100%);
  overflow: hidden;
}
.about-cover::before{
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: .22;
  pointer-events: none;
}
.about-cover__inner{
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
  max-width: var(--container-w);
  margin: 0 auto;
}
.about-cover__eyebrow{ color: var(--c-neon); }
.about-cover__title{
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-style: italic;
  margin: 0 0 1.25rem;
  text-shadow: 0 0 40px rgba(57, 255, 20, .12);
}
.about-cover__sub{
  display: block;
  color: var(--c-orange);
  font-size: clamp(1.15rem, 2.4vw, 1.75rem);
  margin-top: .55rem;
}
.about-cover__lead{
  max-width: 38em;
  color: var(--c-text-secondary);
  font-size: 1rem;
  line-height: 1.75;
  margin: 0 0 1.5rem;
}
.about-cover__actions{
  display: flex;
  flex-wrap: wrap;
  gap: .875rem;
  margin-bottom: 2rem;
}
.about-cover__visual{
  position: relative;
  margin: 0 24px 24px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  box-shadow: 24px 24px 0 rgba(57, 255, 20, .08), 0 24px 60px rgba(0, 0, 0, .25);
}
.about-cover__visual img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.about-cover__aside{ position: relative; }

.about-aside-card{
  position: sticky;
  top: calc(var(--header-h) + 24px);
  background: var(--about-panel);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.5rem 1.75rem;
  backdrop-filter: blur(8px);
}
.about-aside__label{
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--c-neon);
  margin: 0 0 1rem;
  padding-bottom: .65rem;
  border-bottom: 2px solid var(--c-orange);
  display: inline-block;
}
.about-aside__list{
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
}
.about-aside__item{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: .7rem 0;
  border-bottom: 1px dashed var(--about-line);
}
.about-aside__item dt{ color: var(--c-text-secondary); font-size: .875rem; }
.about-aside__item dd{
  color: var(--c-text);
  font-family: var(--font-head);
  font-style: italic;
  font-size: 1.15rem;
  margin: 0;
}
.about-aside__note{
  color: var(--c-text-secondary);
  font-size: .8125rem;
  line-height: 1.6;
  margin: 1.25rem 0 0;
}

.about-index{
  margin-top: 1.5rem;
  background: var(--about-panel);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.25rem 1.1rem;
  display: grid;
  gap: .35rem;
}
.about-index__label{
  font-family: var(--font-head);
  font-size: 1rem;
  font-style: italic;
  color: var(--c-orange);
  margin: 0 0 .35rem;
}
.about-index a{
  color: var(--c-text-secondary);
  text-decoration: none;
  font-size: .9375rem;
  padding: .3rem 0;
  border-bottom: 1px dashed var(--about-line);
  transition: color var(--transition), padding-left var(--transition);
}
.about-index a:hover{
  color: var(--c-neon);
  padding-left: .5rem;
}

/* === 02 使命与愿景 === */
.about-mission{
  position: relative;
  padding: clamp(3rem, 6vw, 6.5rem) var(--page-gutter);
  background: var(--c-deep);
}
.about-mission::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(100deg, var(--c-neon) 0 42%, var(--c-orange) 42% 58%, transparent 58%);
}
.about-mission__heading{ margin-bottom: 1rem; }
.about-mission__body{
  color: var(--c-text-secondary);
  line-height: 1.85;
}
.about-mission__body p{ margin: 0 0 1rem; }
.about-mission__body p:last-child{ margin-bottom: 2rem; }
.about-mission__grid{
  display: grid;
  gap: 1rem;
}

.mission-card{
  position: relative;
  background: rgba(22, 50, 92, .5);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.5rem 1.75rem;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.mission-card:hover{
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .25);
}
.mission-card__num{
  position: absolute;
  top: .4rem;
  right: 1rem;
  font-family: var(--font-head);
  font-style: italic;
  font-size: 3rem;
  color: rgba(255, 107, 0, .16);
  line-height: 1;
  pointer-events: none;
}
.mission-card h3{
  font-family: var(--font-head);
  font-style: italic;
  font-size: 1.3rem;
  margin: 0 0 .5rem;
  color: var(--c-neon);
}
.mission-card p{
  color: var(--c-text-secondary);
  font-size: .95rem;
  line-height: 1.7;
  margin: 0;
}

/* === 03 发展里程碑 === */
.about-milestone{
  position: relative;
  padding: clamp(3rem, 6vw, 6.5rem) var(--page-gutter);
  background: linear-gradient(180deg, var(--c-deep-light) 0%, var(--c-deep) 100%);
  overflow: hidden;
}
.about-milestone::before,
.about-milestone::after{
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(57, 255, 20, .2);
  pointer-events: none;
}
.about-milestone::before{
  width: 180px;
  height: 180px;
  top: 8%;
  right: -60px;
  box-shadow: 0 0 0 40px rgba(57, 255, 20, .03), 0 0 0 80px rgba(57, 255, 20, .02);
}
.about-milestone::after{
  width: 120px;
  height: 120px;
  bottom: 6%;
  left: -40px;
  border-color: rgba(255, 107, 0, .22);
  box-shadow: 0 0 0 30px rgba(255, 107, 0, .03), 0 0 0 60px rgba(255, 107, 0, .02);
}
.about-milestone__intro{ margin-bottom: 2.5rem; }
.about-milestone__desc{ color: var(--c-text-secondary); line-height: 1.75; }
.about-milestone__figure{
  margin: 1.5rem 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  box-shadow: 0 20px 50px rgba(0, 0, 0, .22);
}
.about-milestone__figure img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.milestone-list{
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.milestone-list::before{
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(var(--c-neon), var(--c-orange));
}
.milestone-item{
  position: relative;
  padding-left: 2.25rem;
  margin-bottom: 1rem;
}
.milestone-item::before{
  content: "";
  position: absolute;
  left: 0;
  top: 1.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 3px solid var(--c-neon);
  box-shadow: 0 0 12px var(--glow-green);
  z-index: 1;
}
.milestone-detail{
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  background: rgba(22, 50, 92, .45);
  transition: border-color var(--transition), background var(--transition);
}
.milestone-detail[open]{
  border-color: rgba(57, 255, 20, .45);
  background: rgba(22, 50, 92, .65);
}
.milestone-detail summary{
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: 1rem 1.25rem;
  transition: background var(--transition);
}
.milestone-detail summary::-webkit-details-marker{ display: none; }
.milestone-detail summary:hover{ background: rgba(255, 107, 0, .06); }
.milestone-detail[open] summary{ border-bottom: 1px solid var(--c-border); }
.milestone-year{
  font-family: var(--font-head);
  font-style: italic;
  color: var(--c-orange);
  font-size: 1.1rem;
  white-space: nowrap;
}
.milestone-heading{
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.3;
}
.milestone-toggle{
  margin-left: auto;
  font-family: var(--font-head);
  color: var(--c-neon);
  font-size: 1.5rem;
  line-height: 1;
  transition: transform var(--transition);
}
.milestone-detail[open] .milestone-toggle{ transform: rotate(45deg); }
.milestone-content{
  padding: .5rem 1.25rem 1.25rem;
  color: var(--c-text-secondary);
  font-size: .95rem;
  line-height: 1.7;
}

/* === 04 数据能力与覆盖 === */
.about-capability{
  position: relative;
  padding: clamp(3rem, 6vw, 6.5rem) var(--page-gutter);
  background:
    radial-gradient(800px 420px at 90% 0%, var(--about-glow-green), transparent 60%),
    radial-gradient(700px 420px at 8% 100%, var(--about-glow-orange), transparent 55%),
    var(--c-deep);
}
.about-capability__intro{
  max-width: 760px;
  margin-bottom: 2rem;
}
.about-capability__intro p{
  color: var(--c-text-secondary);
  line-height: 1.75;
}
.capability-stats{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 2rem 0;
}
.capability-stat{
  background: var(--about-panel);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.capability-stat::after{
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-neon), var(--c-orange));
}
.capability-stat__value{
  display: block;
  font-family: var(--font-head);
  font-style: italic;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  color: var(--c-neon);
  line-height: 1.05;
  margin-bottom: .35rem;
}
.capability-stat__label{
  font-size: .8125rem;
  color: var(--c-text-secondary);
}
.about-capability__body{
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
  align-items: center;
}
.about-capability__note{
  color: var(--c-text-secondary);
  line-height: 1.8;
  margin: 0;
}
.capability-chart{
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  background: var(--c-deep-light);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .18);
}
.capability-chart img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.capability-chart figcaption{
  padding: .75rem 1rem;
  color: var(--c-text-secondary);
  font-size: .8125rem;
  border-top: 1px solid var(--c-border);
  background: rgba(11, 29, 58, .5);
}

/* === 05 资质与认可 === */
.about-credential{
  padding: clamp(3rem, 6vw, 6rem) var(--page-gutter);
  background: var(--c-frost);
  color: var(--c-text-dark);
}
.about-credential__intro{
  max-width: 720px;
  margin-bottom: 2rem;
}
.about-credential .section-title{ color: var(--c-text-dark); }
.about-credential .eyebrow{ color: var(--c-orange); }
.about-credential__intro p{
  color: rgba(16, 35, 61, .72);
  line-height: 1.75;
}
.about-credential__grid{
  display: grid;
  gap: 1rem;
}
.credential-card{
  background: #fff;
  border: 1px solid rgba(16, 35, 61, .08);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.5rem 1.75rem;
  box-shadow: 0 8px 30px rgba(11, 29, 58, .06);
  transition: transform var(--transition), box-shadow var(--transition);
}
.credential-card:hover{
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(11, 29, 58, .1);
}
.credential-card__badge{
  display: inline-block;
  font-family: var(--font-head);
  font-style: italic;
  font-size: .85rem;
  color: #fff;
  background: var(--c-orange);
  padding: .3rem .75rem;
  border-radius: var(--radius-sm);
  margin-bottom: .75rem;
}
.credential-card h3{
  font-family: var(--font-head);
  font-style: italic;
  font-size: 1.25rem;
  margin: 0 0 .3rem;
  color: var(--c-text-dark);
}
.credential-card__value{
  font-family: var(--font-head);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--c-orange);
  margin: 0 0 .5rem;
}
.credential-card p:last-child{
  color: rgba(16, 35, 61, .65);
  font-size: .9rem;
  line-height: 1.65;
  margin: 0;
}

/* === 06 服务承诺 === */
.about-service{
  padding: clamp(3rem, 6vw, 6rem) var(--page-gutter);
  background: var(--c-deep);
}
.about-service__card{
  max-width: 920px;
  margin-top: 2rem;
  background: linear-gradient(135deg, rgba(22, 50, 92, .75), rgba(11, 29, 58, .9));
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 4vw, 3rem);
}
.about-service__lead{
  color: var(--c-text-secondary);
  line-height: 1.8;
  margin: 0 0 1.5rem;
}
.about-service__contact{
  display: grid;
  gap: .75rem;
  margin: 0 0 1.5rem;
}
.about-service__contact div{
  background: rgba(11, 29, 58, .5);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--c-neon);
}
.about-service__contact dt{
  color: var(--c-text-secondary);
  font-size: .8125rem;
  margin-bottom: .2rem;
}
.about-service__contact dd{
  color: var(--c-text);
  font-weight: 700;
  margin: 0;
  line-height: 1.4;
}
.about-service__note{
  color: var(--c-text-secondary);
  font-size: .875rem;
  line-height: 1.7;
  margin: 0 0 1.75rem;
}
.about-service__links{
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* === 响应式 === */
@media (min-width: 768px){
  .about-mission__grid{ grid-template-columns: repeat(3, 1fr); }
  .capability-stats{ grid-template-columns: repeat(4, 1fr); }
  .about-service__contact{ grid-template-columns: repeat(3, 1fr); }
  .about-credential__grid{ grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 960px){
  .about-cover__inner{
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .75fr);
    align-items: start;
  }
  .about-mission{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem 3rem;
  }
  .about-mission__heading{ grid-column: 1; }
  .about-mission__body{ grid-column: 2; }
  .about-mission__grid{
    grid-column: 1 / -1;
    margin-top: 1rem;
  }
}

@media (min-width: 1024px){
  .about-milestone{
    display: grid;
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 3.5rem;
    align-items: start;
  }
  .about-milestone__intro{
    position: sticky;
    top: calc(var(--header-h) + 24px);
    margin-bottom: 0;
  }
  .about-milestone__timeline{ min-width: 0; }
  .about-capability__body{ grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce){
  .page-about *,
  .page-about *::before,
  .page-about *::after{
    transition: none !important;
    animation: none !important;
  }
}