.page-about {
  --about-pad: clamp(1.15rem, 3.2vw, 2.25rem);
  --about-cut: 22px;
  background: var(--night);
  color: var(--warm);
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(1.3rem, 4vw, 2.4rem) 0 clamp(2rem, 5vw, 3.4rem);
  background:
    radial-gradient(110% 80% at 88% -10%, rgba(255, 107, 26, 0.2), transparent 62%),
    radial-gradient(80% 60% at -10% 100%, rgba(47, 224, 200, 0.16), transparent 68%),
    var(--night);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 48%;
  z-index: -1;
  background:
    repeating-linear-gradient(168deg, rgba(124, 155, 179, 0.16) 0 1px, transparent 1px 22px),
    linear-gradient(180deg, transparent, rgba(14, 42, 68, 0.6));
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 62%);
  mask-image: linear-gradient(180deg, transparent, #000 62%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
  align-items: end;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0 0 0.9rem;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
}

.page-about .breadcrumb li {
  color: var(--haze);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: rgba(124, 155, 179, 0.6);
}

.page-about .breadcrumb a {
  color: rgba(255, 247, 234, 0.8);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--mint);
}

.page-about .breadcrumb a[aria-current="page"] {
  color: var(--orange);
}

.page-about .about-hero h1 {
  margin: 0.55rem 0 0;
  font-size: clamp(2.1rem, 6.4vw, 4.1rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 16ch;
}

.page-about .about-hero h1 .hl {
  color: var(--orange);
  display: inline-block;
  border-bottom: 6px solid rgba(47, 224, 200, 0.45);
  padding-bottom: 0.1em;
}

.page-about .about-hero__lead {
  margin: 1rem 0 0;
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 247, 234, 0.8);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.5rem 0 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
}

.page-about .hero-facts__item dt {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--haze);
}

.page-about .hero-facts__item dd {
  margin: 0.3rem 0 0;
  font-size: 0.86rem;
  color: rgba(255, 247, 234, 0.78);
}

.page-about .hero-facts__item .mono {
  display: block;
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--warm);
}

.page-about .hero-facts__item:nth-child(1) .mono {
  color: var(--orange);
}

.page-about .hero-facts__item:nth-child(2) .mono {
  color: var(--mint);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 34px));
  filter: saturate(1.05) contrast(1.05);
}

.page-about .about-hero__figure figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.45rem 0.7rem;
  background: rgba(7, 26, 43, 0.82);
  border-left: 2px solid var(--mint);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: rgba(255, 247, 234, 0.85);
}

.page-about .about-body {
  padding: clamp(1.8rem, 5vw, 3.2rem) 0 clamp(2.4rem, 6vw, 4rem);
}

.page-about .about-body__inner {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}

.page-about .about-toc {
  min-width: 0;
}

.page-about .about-toc__label {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--haze);
}

.page-about .about-toc__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--line);
  background: rgba(14, 42, 68, 0.5);
  color: rgba(255, 247, 234, 0.82);
  font-size: 0.82rem;
  text-decoration: none;
  white-space: nowrap;
}

.page-about .about-toc a .mono {
  font-size: 0.68rem;
  color: var(--haze);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  border-color: var(--mint);
  color: var(--mint);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(1.8rem, 4vw, 3rem);
  min-width: 0;
}

.page-about .about-section h2 {
  margin: 0.4rem 0 0;
  font-size: clamp(1.45rem, 4vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 900;
}

.page-about .about-section h3 {
  font-weight: 700;
}

.page-about .about-text {
  margin: 0.9rem 0 0;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(255, 247, 234, 0.8);
}

.page-about .about-text a {
  color: var(--mint);
  text-underline-offset: 3px;
}

.page-about .about-quote {
  margin: 1.4rem 0 0;
  padding: 0.9rem 0 0.9rem 1.1rem;
  border-left: 4px solid var(--orange);
  font-size: clamp(1.05rem, 2.6vw, 1.3rem);
  line-height: 1.6;
  font-weight: 700;
  color: var(--warm);
  max-width: 46ch;
}

.page-about .about-paper {
  position: relative;
  background: linear-gradient(180deg, var(--paper), #EFE3D0);
  color: var(--ink);
  padding: var(--about-pad);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-paper h3 {
  font-size: 1rem;
  margin: 0;
  color: var(--ink);
}

.page-about .about-paper p {
  margin: 0.6rem 0 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(18, 24, 32, 0.82);
}

.page-about .about-paper a {
  color: var(--mint-deep);
  text-underline-offset: 3px;
}

/* 团队席位 */
.page-about .seats {
  margin-top: 1.3rem;
  border-top: 1px solid var(--line-ink);
}

.page-about .seat {
  border-bottom: 1px solid var(--line-ink);
}

.page-about .seat > summary {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.85rem 0.1rem;
  cursor: pointer;
  list-style: none;
}

.page-about .seat > summary::-webkit-details-marker {
  display: none;
}

.page-about .seat > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .seat[open] > summary::after {
  content: "−";
}

.page-about .seat__num {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink);
  min-width: 2.1ch;
}

.page-about .seat__role {
  font-weight: 700;
  font-size: 0.98rem;
}

.page-about .seat__hint {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: rgba(18, 24, 32, 0.5);
}

.page-about .seat__body {
  padding: 0 0 1rem;
}

.page-about .seat__body p {
  margin: 0.45rem 0 0;
}

.page-about .seat__bar {
  height: 3px;
  background: rgba(18, 24, 32, 0.14);
}

.page-about .seat__bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--mint));
}

.page-about .seat--rec .seat__bar span {
  width: 42%;
}

.page-about .seat--edit .seat__bar span {
  width: 32%;
}

.page-about .seat--data .seat__bar span {
  width: 16%;
}

.page-about .seat--tech .seat__bar span {
  width: 11%;
}

/* 记录流程 */
.page-about .about-figure {
  margin: 1.3rem 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), 0 100%);
}

.page-about .about-figure figcaption {
  margin-top: 0.55rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--haze);
}

.page-about .steps {
  counter-reset: step;
  display: grid;
  gap: 0.85rem;
  margin: 1.3rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  padding: 0.9rem 1rem 1rem 1.1rem;
  background: rgba(14, 42, 68, 0.55);
  border-left: 3px solid var(--mint);
}

.page-about .step:nth-child(even) {
  border-left-color: var(--orange);
}

.page-about .step__no {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--mint);
}

.page-about .step:nth-child(even) .step__no {
  color: var(--orange);
}

.page-about .step h3 {
  margin: 0.3rem 0 0;
  font-size: 1rem;
  color: var(--warm);
}

.page-about .step p:last-child {
  margin: 0.4rem 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(255, 247, 234, 0.78);
}

.page-about .step p a {
  color: var(--mint);
  text-underline-offset: 3px;
}

/* 赛区合作 */
.page-about .net {
  display: grid;
  gap: 1.3rem;
  margin-top: 1rem;
}

.page-about .net__main {
  min-width: 0;
}

.page-about .net-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  margin-top: 1.2rem;
}

.page-about .net-stat {
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line);
  background: rgba(14, 42, 68, 0.45);
}

.page-about .net-stat__n {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.4rem;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .net-stat:nth-child(even) .net-stat__n {
  color: var(--mint);
}

.page-about .net-stat__l {
  margin: 0.25rem 0 0;
  font-size: 0.8rem;
  color: var(--haze);
}

.page-about .net__join {
  margin-top: 1.2rem;
}

.page-about .net__figure {
  margin: 0;
}

.page-about .net__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 24px));
}

.page-about .net__figure figcaption {
  margin-top: 0.55rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--haze);
}

/* 发展历程 */
.page-about .year-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.15rem;
}

.page-about .year-chips a {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--mint);
  text-decoration: none;
}

.page-about .year-chips a:hover,
.page-about .year-chips a:focus-visible {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--night);
}

.page-about .timeline-wrap {
  margin-top: 1.1rem;
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.6rem;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.45rem;
  bottom: 0.45rem;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--mint));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 1.15rem;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.6rem + 1px);
  top: 0.4rem;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border: 2px solid var(--orange);
  border-radius: 50%;
  background: var(--paper);
}

.page-about .timeline__item:nth-child(even)::before {
  border-color: var(--mint-deep);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .timeline__item:nth-child(even) .timeline__year {
  color: var(--mint-deep);
}

.page-about .timeline__item h3 {
  margin: 0.2rem 0 0;
  font-size: 1rem;
}

.page-about .timeline__item p {
  margin: 0.35rem 0 0;
}

/* 资质荣誉 */
.page-about .honors {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.page-about .honor {
  padding: 1rem 1rem 1.1rem;
  border-top: 3px solid var(--orange);
  background: rgba(14, 42, 68, 0.52);
}

.page-about .honor:nth-child(2) {
  border-top-color: var(--mint);
}

.page-about .honor:nth-child(3) {
  border-top-color: var(--paper-2);
}

.page-about .honor__k {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--haze);
}

.page-about .honor h3 {
  margin: 0.35rem 0 0;
  font-size: 1rem;
  color: var(--warm);
}

.page-about .honor p:last-child {
  margin: 0.4rem 0 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(255, 247, 234, 0.78);
}

/* 合作入口 */
.page-about .join {
  margin-top: 1.2rem;
  display: grid;
  gap: 1.1rem;
}

.page-about .join__copy p:first-child {
  margin-top: 0;
}

.page-about .join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-content: start;
}

@media (min-width: 760px) {
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .net-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .honors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .join {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .net {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 1.6rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(1.6rem, 3vw, 3rem);
  }

  .page-about .about-hero__figure {
    aspect-ratio: 4 / 3;
  }
}

@media (min-width: 980px) {
  .page-about .about-body__inner {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 5.6rem;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 2px solid var(--line);
  }

  .page-about .about-toc__list li {
    border: 0;
  }

  .page-about .about-toc a {
    width: 100%;
    padding: 0.42rem 0.2rem 0.42rem 0.7rem;
    margin-left: -2px;
    border: 0;
    border-left: 2px solid transparent;
    background: none;
    white-space: normal;
    font-size: 0.86rem;
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    border-left-color: var(--orange);
    color: var(--warm);
  }

  .page-about .about-text {
    font-size: 1rem;
  }
}

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