.page-about{
  --about-card-border: rgba(10, 22, 51, 0.08);
  --about-glass-bg: rgba(255, 255, 255, 0.06);
  --about-glass-border: rgba(255, 255, 255, 0.14);
  --about-desc-soft: rgba(255, 255, 255, 0.72);
}

.page-about .section-pad{
  padding-block: clamp(3rem, 7vw, 5.5rem);
}

/* ===== 首屏 Hero ===== */
.page-about .about-hero{
  position: relative;
  overflow: hidden;
  background-color: var(--deep-navy);
  background-image:
    var(--navy-grid-bg),
    linear-gradient(135deg, rgba(34, 211, 238, 0.14) 0%, rgba(37, 99, 235, 0) 45%, rgba(249, 115, 22, 0.2) 100%);
  color: var(--white);
  padding-top: 1.5rem;
}
.page-about .about-hero::after{
  content: "";
  position: absolute;
  right: -12%;
  bottom: -1.25rem;
  width: 76%;
  height: 5px;
  background: linear-gradient(90deg, transparent, var(--orange), var(--cyan));
  transform: rotate(-1.8deg);
  opacity: 0.8;
  pointer-events: none;
}
.page-about .about-hero .breadcrumbs{
  margin-bottom: 2.75rem;
}
.page-about .about-hero .breadcrumbs a{
  color: rgba(255, 255, 255, 0.7);
}
.page-about .about-hero .breadcrumbs a:hover{
  color: var(--cyan);
}
.page-about .about-hero .breadcrumbs__item{
  color: rgba(255, 255, 255, 0.5);
}
.page-about .about-hero__inner{
  display: grid;
  gap: 2.25rem;
  align-items: center;
}
.page-about .about-hero__content .section-label{
  color: var(--cyan);
}
.page-about .about-hero .display-title{
  font-size: clamp(1.75rem, 4vw, 3.25rem);
  line-height: 1.2;
  margin: 0.85rem 0 1.1rem;
}
.page-about .about-hero .lede{
  max-width: 42em;
  color: rgba(255, 255, 255, 0.78);
  font-size: 1.05rem;
  line-height: 1.8;
}
.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.page-about .about-hero__media{
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
  box-shadow: 0 18px 44px rgba(6, 13, 32, 0.4);
}
.page-about .about-hero__media img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .about-hero__media::after{
  content: "UTC+8 · 本地更新时间";
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  border: 1px solid rgba(34, 211, 238, 0.5);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  background: rgba(10, 22, 51, 0.72);
  backdrop-filter: blur(6px);
  font-family: var(--font-headline);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--white);
}

/* ===== 01 我们为什么来到这里 ===== */
.page-about .about-origin{
  background: var(--gray-100);
  border-bottom: 1px solid rgba(10, 22, 51, 0.06);
}
.page-about .about-origin__grid{
  display: grid;
  gap: 2rem;
}
.page-about .about-origin__lead .section-label{
  margin-bottom: 0.85rem;
}
.page-about .about-origin__lead h2{
  margin: 0;
  font-family: var(--font-headline);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  line-height: 1.25;
  color: var(--deep-navy);
}
.page-about .about-origin__body p{
  margin-bottom: 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--slate-800);
}
.page-about .about-origin__principles{
  margin-top: 1.5rem;
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1rem 1.25rem;
  background: var(--white);
  box-shadow: var(--shadow-card);
  font-family: var(--font-headline);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--deep-navy);
}

/* ===== 02 一组冷数据 ===== */
.page-about .about-stats{
  background: var(--light-slate);
}
.page-about .about-stats__head{
  max-width: 760px;
}
.page-about .about-stats__head h2{
  margin: 0.7rem 0 0.75rem;
  font-family: var(--font-headline);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  color: var(--deep-navy);
}
.page-about .about-stats__desc{
  font-size: 1rem;
  line-height: 1.75;
  color: var(--slate-800);
}
.page-about .stats-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
  margin-top: 2rem;
}
.page-about .stat-card{
  position: relative;
  overflow: hidden;
  border: var(--ink-line);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.1rem 1.1rem;
  background: var(--white);
  box-shadow: var(--shadow-card);
}
.page-about .stat-card::before{
  content: "";
  position: absolute;
  top: 0;
  left: 1rem;
  width: 2.25rem;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: var(--blue);
}
.page-about .stat-card--highlight{
  background: var(--deep-navy);
  border-color: rgba(10, 22, 51, 0.9);
}
.page-about .stat-card--highlight::before{
  background: var(--orange);
}
.page-about .stat-card__num{
  display: block;
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4vw, 3.25rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-feature-settings: "tnum";
  color: var(--deep-navy);
  white-space: nowrap;
}
.page-about .stat-card--highlight .stat-card__num{
  color: var(--white);
}
.page-about .stat-card__unit{
  margin-left: 0.2em;
  font-size: 0.58em;
  font-weight: 700;
  color: var(--orange);
}
.page-about .stat-card--highlight .stat-card__unit{
  color: var(--cyan);
}
.page-about .stat-card__label{
  display: block;
  margin-top: 0.4rem;
  font-family: var(--font-headline);
  font-size: 0.88rem;
  color: var(--slate-800);
}
.page-about .stat-card--highlight .stat-card__label{
  color: rgba(255, 255, 255, 0.75);
}
.page-about .about-stats__map{
  margin-top: 2rem;
  overflow: hidden;
  border: 1px solid rgba(10, 22, 51, 0.12);
  border-radius: var(--radius-md);
  background: var(--white);
}
.page-about .about-stats__map img{
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-stats__map figcaption{
  padding: 0.9rem 1.25rem;
  border-top: 1px solid rgba(10, 22, 51, 0.08);
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--slate-800);
}

/* ===== 03 里程碑时间线 ===== */
.page-about .about-timeline{
  background: var(--white);
}
.page-about .about-timeline__head{
  max-width: 720px;
  margin-bottom: 2.75rem;
}
.page-about .about-timeline__head h2{
  margin: 0.7rem 0 0.75rem;
  font-family: var(--font-headline);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  color: var(--deep-navy);
}
.page-about .about-timeline__head p{
  line-height: 1.75;
  color: var(--slate-800);
}
.page-about .timeline{
  position: relative;
  max-width: 920px;
  margin-inline: auto;
}
.page-about .timeline::before{
  content: "";
  position: absolute;
  left: 0.875rem;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--orange), var(--blue), var(--cyan));
  opacity: 0.45;
}
.page-about .timeline__item{
  position: relative;
  padding-left: 3.5rem;
  margin-bottom: 2.5rem;
}
.page-about .timeline__item:last-child{
  margin-bottom: 0;
}
.page-about .timeline__year{
  position: absolute;
  left: 0.9375rem;
  top: -1.25rem;
  transform: translateX(-50%);
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: 999px;
  padding: 0.12rem 0.55rem;
  background: var(--white);
  font-family: var(--font-headline);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-align: center;
  color: var(--blue);
  font-feature-settings: "tnum";
}
.page-about .timeline__dot{
  position: absolute;
  left: 0.6875rem;
  top: 0.35rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.18);
}
.page-about .timeline__card{
  border: 1px solid rgba(10, 22, 51, 0.08);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.35rem;
  background: var(--white);
  box-shadow: var(--shadow-card);
}
.page-about .timeline__tag{
  display: inline-block;
  margin-bottom: 0.45rem;
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  background: rgba(249, 115, 22, 0.12);
  font-family: var(--font-headline);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--orange);
}
.page-about .timeline__card h3{
  margin: 0 0 0.4rem;
  font-family: var(--font-headline);
  font-size: 1.1rem;
  color: var(--deep-navy);
}
.page-about .timeline__card p{
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--slate-800);
}

/* ===== 04 内容与数据团队 ===== */
.page-about .about-team{
  background: var(--gray-100);
}
.page-about .about-team__head{
  max-width: 760px;
  margin-bottom: 2.25rem;
}
.page-about .about-team__head h2{
  margin: 0.7rem 0 0.75rem;
  font-family: var(--font-headline);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  color: var(--deep-navy);
}
.page-about .about-team__head p{
  line-height: 1.75;
  color: var(--slate-800);
}
.page-about .about-team__grid{
  display: grid;
  gap: 2rem;
}
.page-about .about-team__chart{
  display: flex;
  flex-direction: column;
  align-items: center;
  border: var(--ink-line);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  background: var(--white);
  box-shadow: var(--shadow-card);
}
.page-about .donut-chart{
  display: block;
  width: min(100%, 280px);
  height: auto;
}
.page-about .donut-num{
  font-family: var(--font-headline);
  font-size: 2.25rem;
  font-weight: 800;
  fill: var(--deep-navy);
}
.page-about .donut-label{
  font-family: var(--font-body);
  font-size: 0.78rem;
  fill: var(--slate-800);
}
.page-about .donut-legend{
  display: grid;
  gap: 0.55rem;
  width: 100%;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .donut-legend li{
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.6rem;
  font-family: var(--font-headline);
  font-size: 0.9rem;
  color: var(--slate-800);
  transition: background-color 0.2s ease, transform 0.2s ease;
}
.page-about .donut-legend li:hover{
  background: rgba(37, 99, 235, 0.08);
  transform: translateX(3px);
}
.page-about .donut-legend i{
  width: 0.7rem;
  height: 0.7rem;
  flex: none;
  border-radius: 50%;
}
.page-about .donut-legend li:nth-child(1) i{ background: var(--orange); }
.page-about .donut-legend li:nth-child(2) i{ background: var(--blue); }
.page-about .donut-legend li:nth-child(3) i{ background: var(--cyan); }
.page-about .donut-legend li:nth-child(4) i{ background: var(--amber); }
.page-about .donut-legend strong{
  margin-left: auto;
  font-feature-settings: "tnum";
  color: var(--deep-navy);
}
.page-about .about-team__notes{
  display: grid;
  gap: 1.25rem;
}
.page-about .about-team__visual{
  overflow: hidden;
  border: var(--ink-line);
  border-radius: var(--radius-md);
  background: var(--white);
}
.page-about .about-team__visual img{
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-team__desc{
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--slate-800);
}
.page-about .about-team__stats{
  display: grid;
  gap: 0.75rem;
}
.page-about .about-team__stat{
  border: var(--ink-line);
  border-radius: var(--radius-sm);
  padding: 1rem 1.15rem;
  background: var(--white);
  font-family: var(--font-headline);
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--deep-navy);
}
.page-about .about-team__stat strong{
  display: block;
  margin-bottom: 0.15rem;
  font-size: 1.35rem;
  font-weight: 800;
  font-feature-settings: "tnum";
  color: var(--orange);
}

/* ===== 05 认证与荣誉 ===== */
.page-about .about-badges{
  position: relative;
  background-color: var(--deep-navy);
  background-image:
    var(--navy-grid-bg),
    radial-gradient(circle at 80% 18%, rgba(34, 211, 238, 0.16), transparent 42%);
  color: var(--white);
}
.page-about .about-badges .section-label{
  color: var(--cyan);
}
.page-about .about-badges h2{
  margin: 0.7rem 0 0.75rem;
  font-family: var(--font-headline);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
}
.page-about .about-badges__desc{
  max-width: 720px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.72);
}
.page-about .badges-grid{
  display: grid;
  gap: 1rem;
  margin-top: 2.25rem;
}
.page-about .badge-card{
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.4rem;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
  transition: transform 0.25s ease, background-color 0.25s ease;
}
.page-about .badge-card:hover,
.page-about .badge-card:focus-within{
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
}
.page-about .badge-card__icon{
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-sm);
  background: rgba(34, 211, 238, 0.12);
  color: var(--cyan);
}
.page-about .badge-card__icon svg{
  width: 1.75rem;
  height: 1.75rem;
}
.page-about .badge-card h3{
  margin: 1rem 0 0.45rem;
  font-family: var(--font-headline);
  font-size: 1.08rem;
  color: var(--white);
}
.page-about .badge-card p{
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.72);
}

/* ===== 06 从信号到数据 · 工作流 ===== */
.page-about .about-workflow{
  background: var(--light-slate);
}
.page-about .about-workflow__head{
  max-width: 760px;
  margin-bottom: 2.25rem;
}
.page-about .about-workflow__head h2{
  margin: 0.7rem 0 0.75rem;
  font-family: var(--font-headline);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  color: var(--deep-navy);
}
.page-about .about-workflow__head p{
  line-height: 1.75;
  color: var(--slate-800);
}
.page-about .workflow{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
.page-about .workflow__step{
  border: var(--ink-line);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.25rem;
  background: var(--white);
  box-shadow: var(--shadow-card);
}
.page-about .workflow__index{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  margin-bottom: 0.7rem;
  border-radius: 50%;
  background: var(--deep-navy);
  color: var(--white);
  font-family: var(--font-headline);
  font-size: 0.85rem;
  font-weight: 800;
}
.page-about .workflow__step h3{
  margin: 0 0 0.4rem;
  font-family: var(--font-headline);
  font-size: 1.05rem;
  color: var(--deep-navy);
}
.page-about .workflow__step p{
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--slate-800);
}
.page-about .workflow__connector{
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0;
  color: var(--orange);
}
.page-about .workflow__connector svg{
  display: block;
  width: 2.25rem;
  height: 1.5rem;
}

/* ===== 底部导航区 ===== */
.page-about .about-next{
  background-color: var(--deep-navy);
  background-image:
    var(--navy-grid-bg),
    linear-gradient(90deg, rgba(249, 115, 22, 0.18), transparent 60%);
  color: var(--white);
}
.page-about .about-next .section-label{
  color: var(--cyan);
}
.page-about .about-next h2{
  margin: 0.7rem 0 0.75rem;
  font-family: var(--font-headline);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
}
.page-about .about-next__desc{
  max-width: 680px;
  margin-bottom: 2rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.72);
}
.page-about .about-next__links{
  display: grid;
  gap: 1rem;
}
.page-about .next-link{
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.35rem;
  background: rgba(255, 255, 255, 0.05);
  color: var(--white);
  text-decoration: none;
  transition: background-color 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}
.page-about .next-link:hover{
  border-color: rgba(34, 211, 238, 0.45);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-3px);
}
.page-about .next-link__label{
  font-family: var(--font-headline);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.page-about .next-link__title{
  font-family: var(--font-headline);
  font-size: 1.15rem;
  font-weight: 700;
}
.page-about .next-link__go{
  font-family: var(--font-headline);
  font-size: 0.78rem;
  font-feature-settings: "tnum";
  color: rgba(255, 255, 255, 0.5);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px){
  .page-about .about-hero__inner{
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 3rem;
  }
  .page-about .about-origin__grid{
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3.5rem;
    align-items: start;
  }
  .page-about .stats-grid{
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }
  .page-about .timeline__item{
    padding-left: 5rem;
  }
  .page-about .timeline__year{
    font-size: 0.9rem;
  }
  .page-about .about-team__grid{
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 2.5rem;
    align-items: start;
  }
  .page-about .about-team__chart{
    position: sticky;
    top: 2rem;
  }
  .page-about .badges-grid{
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  .page-about .workflow{
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1rem;
    align-items: stretch;
  }
  .page-about .workflow__step{
    height: 100%;
  }
  .page-about .workflow__connector{
    padding: 0 0.2rem;
  }
  .page-about .about-next__links{
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 767px){
  .page-about .workflow__connector svg{
    transform: rotate(90deg);
  }
}