/* ===== 品牌概况页共用变量与基础 ===== */
.page-about{
  position: relative;
  background: var(--deep-black);
  color: var(--off-white);
}

/* ===== Hero 首屏区 ===== */
.page-about .about-hero{
  position: relative;
  padding-top: 40px;
  padding-bottom: 44px;
  z-index: 0;
}

.page-about .about-hero::before{
  content: '';
  position: absolute;
  top: -60px;
  right: -100px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(30,136,255,0.16), rgba(30,136,255,0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after{
  content: 'DATA STREAM // ARCHIVED';
  display: none;
  position: absolute;
  top: 30px;
  right: 20px;
  color: rgba(57,255,20,0.55);
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border: 1px solid rgba(57,255,20,0.2);
  border-radius: 999px;
  padding: 4px 12px;
  background: rgba(10,10,18,0.55);
  z-index: 1;
  pointer-events: none;
}

.page-about .about-hero-grid{
  display: grid;
  gap: 28px;
  margin-top: 30px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero-copy .page-title{
  margin: 16px 0 12px;
  font-size: clamp(30px, 6vw, 50px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  font-weight: 700;
  font-family: var(--font-display);
}

.page-about .about-hero-copy .page-description{
  color: var(--steel-gray);
  font-size: 16px;
  line-height: 1.7;
  max-width: 58ch;
  margin: 0;
}

.page-about .about-hero-visual{
  border-radius: var(--radius-lg);
  border: 1px solid rgba(30,136,255,0.22);
  background: var(--dark-slate);
  position: relative;
  min-height: 240px;
  overflow: hidden;
  box-shadow: var(--shadow-panel);
}

.page-about .hero-visual-panel{
  position: absolute;
  inset: 0;
  padding: 28px;
  display: flex;
  flex-direction: column;
  background:
    linear-gradient(rgba(30,136,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,136,255,0.05) 1px, transparent 1px);
  background-size: 36px 36px;
}

.page-about .hero-visual-label{
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--steel-gray);
  text-transform: uppercase;
}

.page-about .hero-visual-version{
  font-family: var(--font-display);
  font-size: clamp(44px, 10vw, 64px);
  font-weight: 700;
  line-height: 1;
  color: var(--off-white);
  margin-top: auto;
  text-shadow: 0 0 32px rgba(30,136,255,0.45);
}

.page-about .hero-visual-line{
  width: 100%;
  height: 2px;
  margin: 18px 0;
  background: linear-gradient(90deg, var(--electric-blue), var(--neon-purple), transparent);
}

.page-about .hero-visual-bar-group{
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 68px;
}

.page-about .hero-visual-bar{
  flex: 1;
  border-radius: 4px 4px 0 0;
  background: linear-gradient(180deg, var(--electric-blue), rgba(30,136,255,0.15));
}

.page-about .hero-visual-bar.bar-1{ height: 38%; }
.page-about .hero-visual-bar.bar-2{ height: 62%; }
.page-about .hero-visual-bar.bar-3{ height: 84%; }
.page-about .hero-visual-bar.bar-4{
  height: 100%;
  background: linear-gradient(180deg, var(--fluorescent-green), rgba(57,255,20,0.15));
}

.page-about .hero-visual-foot{
  margin-top: auto;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--fluorescent-green);
  text-transform: uppercase;
}

/* ===== 主内容布局 ===== */
.page-about .about-main-layout{
  display: grid;
  gap: 44px;
  padding-bottom: 80px;
}

/* ===== 左侧摘要 ===== */
.page-about .about-summary-inner{
  background: linear-gradient(150deg, rgba(19,21,35,0.92), rgba(10,10,18,0.86));
  border: 1px solid rgba(30,136,255,0.2);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: var(--shadow-panel);
}

.page-about .about-summary-head{
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-summary-nav{
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid rgba(255,255,255,0.06);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 12px 0;
}

.page-about .about-summary-nav a{
  color: var(--steel-gray);
  font-size: 15px;
  font-weight: 500;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--transition-base), color var(--transition-base);
  border-left: 2px solid transparent;
}

.page-about .about-summary-nav a:hover{
  color: var(--off-white);
  background: rgba(30,136,255,0.1);
  border-left-color: var(--electric-blue);
}

.page-about .summary-stats{
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.page-about .summary-stats > div{
  background: rgba(10,10,18,0.6);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  border: 1px solid rgba(255,255,255,0.06);
}

.page-about .summary-stats dt{
  font-size: 12px;
  color: var(--steel-gray);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.page-about .summary-stats dd{
  margin: 6px 0 0;
  font-weight: 700;
  font-size: 15px;
  color: var(--off-white);
}

.page-about .summary-links{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .summary-links a{
  text-decoration: none;
}

/* ===== 右侧内容栈 ===== */
.page-about .about-content-stack{
  display: flex;
  flex-direction: column;
  gap: 64px;
}

.page-about .about-section{
  position: relative;
  padding-top: 8px;
}

.page-about .about-section::before{
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(30,136,255,0.35), rgba(176,38,255,0.35), transparent);
  margin-bottom: 28px;
}

.page-about .section-heading{
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .section-index{
  font-family: var(--font-display);
  color: var(--electric-blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .section-heading h2{
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.1;
  margin: 0;
  font-weight: 700;
  font-family: var(--font-display);
}

.page-about .section-intro{
  color: var(--steel-gray);
  font-size: 15px;
  line-height: 1.6;
  margin-top: 2px;
}

/* ===== 01 我们的定位 ===== */
.page-about .about-positioning-wrap{
  display: grid;
  gap: 24px;
}

.page-about .about-positioning-main p{
  font-size: 16px;
  line-height: 1.8;
  color: #C7CDD8;
  margin: 0 0 16px;
}

.page-about .accent-text{
  color: var(--off-white);
  font-weight: 600;
}

.page-about .about-positioning-points{
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-positioning-points li{
  background: rgba(19,21,35,0.6);
  border: 1px solid rgba(30,136,255,0.16);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.6;
  color: #C7CDD8;
}

.page-about .about-positioning-points strong{
  display: block;
  font-size: 14px;
  color: var(--soft-cyan);
  margin-bottom: 4px;
}

.page-about .about-service-panel{
  background: linear-gradient(160deg, rgba(19,21,35,0.92), rgba(10,10,18,0.75));
}

.page-about .about-service-row{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 14px;
}

.page-about .about-service-row:last-child{
  border-bottom: none;
}

.page-about .about-service-row span{
  color: var(--steel-gray);
}

.page-about .about-service-row strong{
  color: var(--off-white);
  font-weight: 600;
}

/* ===== 02 发展历程时间轴 ===== */
.page-about .about-timeline-visual{
  margin: 16px 0 28px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(84,230,255,0.16);
  background: var(--dark-slate);
}

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

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

.page-about .about-timeline::before{
  content: '';
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--electric-blue), var(--neon-purple), var(--fluorescent-green));
  opacity: 0.55;
}

.page-about .timeline-item{
  position: relative;
  padding-left: 46px;
  padding-bottom: 34px;
}

.page-about .timeline-item:last-child{
  padding-bottom: 0;
}

.page-about .timeline-marker{
  position: absolute;
  left: 0;
  top: 18px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--electric-blue);
  border: 3px solid var(--deep-black);
  box-shadow: 0 0 0 2px var(--electric-blue), 0 0 16px rgba(30,136,255,0.4);
}

.page-about .timeline-marker::after{
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px solid rgba(30,136,255,0.35);
  animation: about-pulse 2.4s ease-out infinite;
}

@keyframes about-pulse{
  0%{
    transform: scale(0.6);
    opacity: 1;
  }
  70%{
    transform: scale(1.2);
    opacity: 0;
  }
  100%{
    transform: scale(1.5);
    opacity: 0;
  }
}

.page-about .timeline-card{
  background: rgba(19,21,35,0.65);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.page-about .timeline-card:hover{
  border-color: rgba(30,136,255,0.35);
  box-shadow: 0 8px 28px rgba(0,0,0,0.35);
}

.page-about .timeline-card .version-chip{
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .timeline-card h3{
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--off-white);
}

.page-about .timeline-card p{
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel-gray);
  margin: 0;
}

/* ===== 03 用户规模 ===== */
.page-about .about-scale-grid{
  display: grid;
  gap: 24px;
}

.page-about .about-scale-stats{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.page-about .about-scale-stat{
  background: rgba(19,21,35,0.6);
  border: 1px solid rgba(30,136,255,0.16);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.page-about .about-scale-stat:hover{
  transform: translateY(-3px);
  border-color: rgba(84,230,255,0.3);
}

.page-about .stat-num{
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--off-white);
}

.page-about .stat-label{
  font-size: 13px;
  color: var(--steel-gray);
}

.page-about .about-scale-visual{
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(30,136,255,0.18);
  background: var(--dark-slate);
}

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

.page-about .about-scale-note{
  margin-top: 20px;
  background: rgba(176,38,255,0.08);
  border-left: 3px solid var(--neon-purple);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 16px 20px;
}

.page-about .about-scale-note p{
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #C7CDD8;
}

/* ===== 04 技术认证 ===== */
.page-about .about-cert-wrap{
  display: grid;
  gap: 24px;
}

.page-about .about-cert-grid{
  display: grid;
  gap: 14px;
}

.page-about .about-cert-card{
  background: rgba(19,21,35,0.6);
  border: 1px solid rgba(176,38,255,0.18);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.page-about .about-cert-card:hover{
  border-color: rgba(57,255,20,0.35);
  box-shadow: 0 8px 28px rgba(0,0,0,0.4);
}

.page-about .cert-badge{
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--fluorescent-green);
  border: 1px solid rgba(57,255,20,0.35);
  border-radius: 999px;
  padding: 4px 12px;
  background: rgba(57,255,20,0.06);
  text-transform: uppercase;
}

.page-about .about-cert-card h3{
  font-size: 17px;
  margin: 4px 0 0;
  color: var(--off-white);
}

.page-about .about-cert-card p{
  font-size: 14px;
  line-height: 1.6;
  color: var(--steel-gray);
  margin: 0;
}

.page-about .about-cert-visual{
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(57,255,20,0.16);
  background: var(--dark-slate);
}

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

/* ===== 响应式增强 ===== */
@media (min-width: 640px){
  .page-about .about-hero-grid{
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 36px;
  }

  .page-about .about-positioning-wrap{
    grid-template-columns: 1fr 300px;
    align-items: start;
    gap: 28px;
  }

  .page-about .about-scale-grid{
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 28px;
  }

  .page-about .about-cert-wrap{
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 768px){
  .page-about .about-hero::after{
    display: block;
  }
}

@media (min-width: 992px){
  .page-about .about-hero{
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .page-about .about-main-layout{
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
    padding-bottom: 100px;
  }

  .page-about .about-summary{
    position: sticky;
    top: calc(var(--header-height) + 24px);
  }

  .page-about .about-content-stack{
    gap: 72px;
  }

  .page-about .about-cert-grid{
    grid-template-columns: 1fr;
    gap: 16px;
  }
}