.page-about{
  --about-pad: clamp(1.5rem, 4vw, 3.5rem);
  background: var(--c-cream);
  color: var(--c-ink);
  overflow: clip;
}

/* ===== 首屏框景 ===== */
.page-about .about-hero{
  position: relative;
  background:
    linear-gradient(135deg, rgba(163,230,53,0.08), transparent 30%),
    linear-gradient(135deg, var(--c-deep) 0%, var(--c-deep-2) 60%, var(--c-deep-3) 100%);
  color: var(--c-white);
  padding: 2rem 0 0;
  overflow: hidden;
}
.page-about .about-hero::before{
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  background: linear-gradient(115deg, transparent 0%, transparent 42%, rgba(255,107,53,0.28) 42.5%, rgba(255,107,53,0.28) 50%, transparent 50.5%);
  pointer-events: none;
  z-index: 1;
}
.page-about .about-hero::after{
  content: "FENGYUN";
  position: absolute;
  bottom: -0.1em;
  right: 0.05em;
  font-family: var(--font-display);
  font-size: clamp(4rem, 13vw, 14rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255,255,255,0.08);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero__top{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
  position: relative;
  z-index: 2;
}
.page-about .about-hero__top .breadcrumb{
  margin: 0;
}
.page-about .about-hero__edition{
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.72);
  padding: 0.45rem 1rem;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-pill);
}
.page-about .about-hero__edition::before{
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-lime);
  box-shadow: 0 0 12px var(--c-lime);
}
.page-about .about-hero__main{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: end;
  position: relative;
  z-index: 2;
}
.page-about .about-hero__media{
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,0.35);
}
.page-about .about-hero__media::before{
  content: "";
  position: absolute;
  inset: 14px;
  z-index: 3;
  border: 1px solid rgba(255,255,255,0.28);
  border-radius: calc(var(--radius-lg) - 8px);
  pointer-events: none;
}
.page-about .about-hero__media::after{
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  height: 38%;
  background: linear-gradient(to top, rgba(10,25,47,0.78), transparent);
  z-index: 2;
  pointer-events: none;
}
.page-about .about-hero__media img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  min-height: 260px;
  object-fit: cover;
}
.page-about .about-hero__deco{
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 5;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-ink);
  background: var(--c-orange);
  border-radius: var(--radius-pill);
  padding: 0.3rem 0.8rem;
  transform: rotate(2deg);
}
.page-about .about-hero__beat{
  position: absolute;
  left: 28px;
  bottom: 22px;
  z-index: 4;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-white);
}
.page-about .about-hero__beat::before{
  content: "";
  width: 22px;
  height: 3px;
  background: var(--c-orange);
  border-radius: var(--radius-pill);
}
.page-about .about-hero__panel{
  position: relative;
  padding: 2rem 0 4.5rem;
}
.page-about .about-hero__panel .section-eyebrow{
  color: var(--c-orange);
}
.page-about .about-hero__title{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 6vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: 0.01em;
  margin: 0.65rem 0 1.2rem;
  max-width: 11ch;
}
.page-about .about-hero__lead{
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  line-height: 1.75;
  color: rgba(255,255,255,0.82);
  max-width: 46rem;
  margin-bottom: 1.8rem;
}
.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.page-about .about-hero__meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  position: relative;
  z-index: 3;
}
.page-about .about-hero .status-pill{
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.16);
}
.page-about .about-hero .status-pill__label{
  color: var(--c-white);
}
.page-about .about-hero__index{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.5);
}

/* ===== 章节目录 ===== */
.page-about .about-toc{
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  background: rgba(245,240,232,0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(74,85,104,0.18);
}
.page-about .about-toc__inner{
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding-top: 0.8rem;
  padding-bottom: 0.8rem;
}
.page-about .about-toc__label{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--c-stone);
  text-transform: uppercase;
  padding-right: 1rem;
  border-right: 1px solid rgba(74,85,104,0.25);
}
.page-about .about-toc__inner a{
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--c-ink);
  text-decoration: none;
  position: relative;
  padding: 0.2rem 0;
}
.page-about .about-toc__inner a::after{
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--c-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}
.page-about .about-toc__inner a:hover::after,
.page-about .about-toc__inner a:focus-visible::after{
  transform: scaleX(1);
}

/* ===== 01 从赛事回看开始 ===== */
.page-about .about-origin{
  padding: var(--about-pad) 0;
  background: linear-gradient(180deg, var(--c-cream) 0%, rgba(237,230,216,0.55) 100%);
}
.page-about .about-origin__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: start;
}
.page-about .about-origin__claim .section-title{
  margin-bottom: 1.5rem;
}
.page-about .about-origin__claim p{
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--c-ink);
  max-width: 60ch;
  margin-bottom: 1rem;
}
.page-about .about-origin__claim .btn{
  margin-top: 1.2rem;
}
.page-about .about-origin__stats{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  background: var(--c-deep);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  overflow: hidden;
}
.page-about .about-origin__stats::after{
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(163,230,53,0.16);
}
.page-about .about-stat{
  position: relative;
  z-index: 1;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 1.2rem;
}
.page-about .about-stat__num{
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  color: var(--c-lime);
  line-height: 1;
}
.page-about .about-stat__label{
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: rgba(255,255,255,0.72);
}
.page-about .about-origin__note{
  grid-column: 1 / -1;
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(255,255,255,0.56);
  border-left: 2px solid var(--c-orange);
  padding-left: 0.8rem;
  margin: 0;
}

/* ===== 02 关键里程碑 ===== */
.page-about .about-milestones{
  position: relative;
  background:
    linear-gradient(160deg, var(--c-deep) 0%, var(--c-deep-2) 55%, #0f1e3d 100%);
  color: var(--c-white);
  padding: var(--about-pad) 0 calc(var(--about-pad) * 1.4);
  overflow: hidden;
}
.page-about .about-milestones::before{
  content: "";
  position: absolute;
  top: 0;
  left: 10%;
  width: 42%;
  height: 260px;
  background: linear-gradient(115deg, transparent 0%, rgba(255,107,53,0.16) 100%);
  transform: skewY(-14deg);
  transform-origin: top left;
}
.page-about .about-milestones::after{
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 38%;
  height: 220px;
  background: linear-gradient(115deg, rgba(163,230,53,0.08), transparent 80%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0% 100%);
}
.page-about .about-milestones .section-eyebrow{
  color: var(--c-lime);
}
.page-about .about-milestones__head{
  margin-bottom: 2.5rem;
  position: relative;
  z-index: 2;
}
.page-about .about-timeline{
  position: relative;
  z-index: 2;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(280px, 360px);
  gap: 1.2rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--c-lime) rgba(255,255,255,0.08);
  padding-bottom: 1rem;
}
.page-about .about-timeline::-webkit-scrollbar{
  height: 6px;
}
.page-about .about-timeline::-webkit-scrollbar-thumb{
  background: var(--c-lime);
  border-radius: var(--radius-pill);
}
.page-about .about-timeline::before{
  content: "";
  position: absolute;
  top: 2rem;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-lime), var(--c-orange), var(--c-lime));
  z-index: 0;
  pointer-events: none;
}
.page-about .about-timeline__item{
  position: relative;
  z-index: 1;
  scroll-snap-align: start;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 2rem 1.4rem 1.4rem;
  min-height: 230px;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}
.page-about .about-timeline__item::before{
  content: "";
  position: absolute;
  top: -2px;
  left: 2rem;
  right: 2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--c-lime), var(--c-orange));
  border-radius: var(--radius-pill);
}
.page-about .about-timeline__marker{
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-lime);
  background: rgba(163,230,53,0.1);
  border: 1px solid rgba(163,230,53,0.3);
  border-radius: var(--radius-pill);
  padding: 0.3rem 0.8rem;
}
.page-about .about-timeline__marker--active{
  color: var(--c-orange);
  background: rgba(255,107,53,0.12);
  border-color: rgba(255,107,53,0.4);
}
.page-about .about-timeline__item h3{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 0;
}
.page-about .about-timeline__item p{
  font-size: 0.92rem;
  line-height: 1.6;
  color: rgba(255,255,255,0.72);
  margin: 0;
}
.page-about .about-milestones__detail{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
  position: relative;
  z-index: 2;
}
.page-about .about-milestones__detail .media-frame{
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,0.25);
}
.page-about .about-milestones__detail img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}
.page-about .about-milestones__aside{
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 2rem;
}
.page-about .about-milestones__aside h3{
  font-family: var(--font-display);
  font-size: 1.7rem;
  line-height: 1.15;
  margin: 0.6rem 0 1rem;
}
.page-about .about-milestones__aside p{
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.76);
  margin-bottom: 1.4rem;
}
.page-about .about-timeline__more{
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
  margin: 1.2rem 0;
  background: rgba(255,255,255,0.03);
}
.page-about .about-timeline__more summary{
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--c-lime);
  list-style: none;
}
.page-about .about-timeline__more summary::-webkit-details-marker{
  display: none;
}
.page-about .about-timeline__more summary::before{
  content: "+ ";
}
.page-about .about-timeline__more[open] summary::before{
  content: "− ";
}
.page-about .about-timeline__more ul{
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.5rem;
}
.page-about .about-timeline__more li{
  font-size: 0.9rem;
  line-height: 1.6;
  color: rgba(255,255,255,0.72);
}

/* ===== 03 数据体系与协作生态 ===== */
.page-about .about-ecosystem{
  position: relative;
  background: var(--c-cream);
  padding: var(--about-pad) 0;
  overflow: hidden;
}
.page-about .about-ecosystem::before{
  content: "";
  position: absolute;
  left: -140px;
  top: 60px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  border: 60px solid rgba(90,125,90,0.1);
  pointer-events: none;
}
.page-about .about-eco__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
  position: relative;
  z-index: 1;
}
.page-about .about-eco__main p{
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1rem;
  max-width: 64ch;
}
.page-about .about-eco__tags{
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  align-content: flex-start;
}
.page-about .about-eco__tags span{
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--c-white);
  border: 1px solid rgba(74,85,104,0.2);
  border-radius: var(--radius-pill);
  padding: 0.55rem 1rem;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--c-ink);
}
.page-about .about-eco__tags span::before{
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-lime);
}
.page-about .about-eco__stats{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
  position: relative;
  z-index: 2;
}
.page-about .about-eco__stat{
  position: relative;
  background: var(--c-deep);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  overflow: hidden;
}
.page-about .about-eco__stat::after{
  content: "";
  position: absolute;
  right: -20px;
  bottom: -20px;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(255,107,53,0.14);
}
.page-about .about-eco__num{
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  line-height: 1;
  color: var(--c-white);
}
.page-about .about-eco__cap{
  display: block;
  font-size: 0.86rem;
  color: rgba(255,255,255,0.62);
  margin-top: 0.5rem;
}
.page-about .about-eco__honors{
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
  margin-top: 2rem;
}
.page-about .about-eco__honors div{
  background: rgba(237,230,216,0.55);
  border-left: 4px solid var(--c-moss);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.6rem;
}
.page-about .about-eco__honors div:nth-child(2){
  border-left-color: var(--c-terracotta);
}
.page-about .about-eco__honor-tag{
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-moss);
  margin-bottom: 0.5rem;
}
.page-about .about-eco__honors div:nth-child(2) .about-eco__honor-tag{
  color: var(--c-terracotta);
}
.page-about .about-eco__honors p{
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.7;
}

/* ===== 04 坚持与愿景 ===== */
.page-about .about-vision{
  position: relative;
  background:
    linear-gradient(150deg, var(--c-deep) 0%, var(--c-deep-2) 70%, var(--c-deep) 100%);
  color: var(--c-white);
  padding: calc(var(--about-pad) * 1.4) 0 calc(var(--about-pad) * 1.8);
  overflow: hidden;
}
.page-about .about-vision::before{
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 12px;
  background: linear-gradient(90deg, var(--c-orange) 0%, var(--c-lime) 100%);
}
.page-about .about-vision .section-eyebrow{
  color: var(--c-orange);
}
.page-about .about-vision__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-top: 2rem;
  position: relative;
  z-index: 2;
}
.page-about .about-vision__content p{
  font-size: 1.05rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.82);
  margin-bottom: 1.4rem;
  max-width: 64ch;
}
.page-about .about-vision__content .btn{
  margin-top: 0.6rem;
}
.page-about .about-vision .media-frame{
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,0.3);
}
.page-about .about-vision img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 900px){
  .page-about .about-hero{
    padding-top: 2.5rem;
  }
  .page-about .about-hero__main{
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 3rem;
    align-items: end;
  }
  .page-about .about-hero__media{
    transform: rotate(-1.2deg);
  }
  .page-about .about-hero__title{
    max-width: 14ch;
  }
  .page-about .about-hero__panel{
    padding-bottom: 1.2rem;
  }
  .page-about .about-hero__meta{
    margin-top: 3rem;
  }
  .page-about .about-origin__grid{
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 4rem;
  }
  .page-about .about-milestones__detail{
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 3rem;
    align-items: center;
  }
  .page-about .about-eco__grid{
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 3rem;
    align-items: start;
  }
  .page-about .about-eco__stats{
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-eco__honors{
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-vision__grid{
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 4rem;
    align-items: center;
  }
}