.page-about {
  --about-gutter: clamp(1.25rem, 4vw, 4rem);
  --about-rail: 236px;
  --about-gap: clamp(1.5rem, 3.2vw, 3rem);
  overflow-x: clip;
  padding-bottom: clamp(2rem, 5vw, 4rem);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-wrap {
  width: min(var(--shell), 100% - var(--about-gutter));
  margin-inline: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-block: clamp(0.75rem, 2vw, 1.25rem) 0;
  font-size: var(--step--1);
}

/* ---------- 报头区 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(0.75rem, 2vw, 1.5rem) clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-hero__glow {
  position: absolute;
  top: -12%;
  right: -6%;
  width: min(520px, 68vw);
  height: 360px;
  background: radial-gradient(circle at 70% 30%, rgba(47, 163, 107, 0.28), transparent 62%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-rail-label {
  margin: 0 0 0.85rem;
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1rem;
  display: grid;
  gap: 0.15rem;
  border-left: 1px solid var(--line-mid);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding-block: 0.35rem;
  color: var(--muted);
  text-decoration: none;
  font-size: var(--step--1);
  line-height: 1.5;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--amp);
  transform: translateX(3px);
  outline: none;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  color: var(--turf-600);
  font-size: 0.78rem;
}

.page-about .about-title {
  margin: 0.55rem 0 1rem;
  font-size: clamp(2rem, 1.35rem + 3.4vw, 3.5rem);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--paper);
  transform: skewX(-2.2deg);
  transform-origin: left bottom;
  text-wrap: balance;
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
  font-size: var(--step-0);
  line-height: 1.75;
}

.page-about .about-facts {
  margin-top: clamp(1.4rem, 3vw, 2rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-facts__cell {
  background: var(--ink-900);
  padding: 0.95rem 1rem 1.05rem;
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 1.05rem + 0.9vw, 1.7rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--amp);
  letter-spacing: -0.01em;
}

.page-about .about-facts__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--muted);
}

/* ---------- 封面大图 ---------- */
.page-about .about-cover {
  width: min(var(--shell), 100% - var(--about-gutter));
  margin: 0 auto;
}

.page-about .about-cover img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2.75rem), 0 100%);
  filter: saturate(0.95) contrast(1.05);
}

.page-about .about-cover figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-top: 0.8rem;
  font-size: var(--step--1);
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  scroll-margin-top: 7rem;
}

.page-about .about-section--band {
  background: linear-gradient(120deg, var(--turf-900), var(--ink-950) 68%);
  border-block: 1px solid var(--line-soft);
}

.page-about .about-section--band::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--turf-600), var(--aqua) 38%, transparent 76%);
  opacity: 0.75;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .about-h2 {
  margin: 0.35rem 0 1.15rem;
  font-size: clamp(1.5rem, 1.15rem + 1.7vw, 2.3rem);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-copy p {
  max-width: 70ch;
  margin: 0 0 1.1rem;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-note {
  border-top: 2px solid var(--turf-600);
  padding-top: 0.85rem;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-note__key {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--amp);
}

.page-about .about-note a {
  color: var(--aqua);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

/* ---------- 章节内图片 ---------- */
.page-about .about-figure {
  margin: 1.75rem 0 1.9rem;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
}

.page-about .about-figure figcaption {
  padding-top: 0.6rem;
  font-size: var(--step--1);
  color: var(--muted);
  font-family: var(--font-mono);
}

/* ---------- 团队角色卡 ---------- */
.page-about .about-crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-role {
  position: relative;
  padding: 1.15rem 1.15rem 1.3rem;
  background: var(--ink-900);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-role:hover {
  transform: translateY(-3px);
  border-color: var(--turf-600);
}

.page-about .about-role__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--turf-300);
}

.page-about .about-role h3 {
  margin: 0.45rem 0 0.55rem;
  font-size: var(--step-1);
  color: var(--paper);
}

.page-about .about-role p {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 阶段年表 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0 0 0 1.55rem;
  border-left: 2px dashed rgba(47, 163, 107, 0.45);
  display: grid;
  gap: 1.9rem;
}

.page-about .about-track__item {
  position: relative;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: calc(-1.55rem - 6px);
  top: 0.42rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amp);
  box-shadow: 0 0 0 4px rgba(255, 212, 71, 0.14);
}

.page-about .about-track__phase {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--aqua);
}

.page-about .about-track h3 {
  margin: 0 0 0.5rem;
  font-size: var(--step-1);
  color: var(--paper);
}

.page-about .about-track p:not(.about-track__phase) {
  margin: 0;
  max-width: 66ch;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 合作类型折叠 ---------- */
.page-about .about-fold {
  margin-bottom: 0.7rem;
  background: var(--ink-900);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-fold > summary {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--paper);
  list-style: none;
}

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

.page-about .about-fold > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--amp);
}

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

.page-about .about-fold > summary:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: -2px;
}

.page-about .about-fold__count {
  flex: none;
  font-size: 0.78rem;
  color: var(--turf-300);
}

.page-about .about-fold__body {
  padding: 0 1.1rem 1.1rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-fold__body p {
  margin: 0.9rem 0 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 比赛日动作 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.95rem;
}

.page-about .about-rule {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  padding: 1rem 1.1rem;
  background: var(--ink-900);
  border-left: 3px solid var(--turf-600);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .about-rule__no {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--turf-300);
  padding-top: 0.15rem;
}

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

.page-about .about-rule p {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 资质与荣誉 ---------- */
.page-about .about-creds {
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-cred {
  padding: 1.1rem 1.15rem 1.25rem;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius-sm);
  background: linear-gradient(160deg, rgba(255, 212, 71, 0.09), rgba(17, 31, 51, 0.92) 62%);
}

.page-about .about-cred__tag {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--amp);
}

.page-about .about-cred h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  color: var(--paper);
}

.page-about .about-cred p {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(1.6rem, 4vw, 2.5rem);
  padding: clamp(1.35rem, 4vw, 2.25rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.2rem;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 88% 16%, rgba(255, 212, 71, 0.16), transparent 55%),
    var(--ink-900);
}

.page-about .about-cta h3 {
  margin: 0 0 0.5rem;
  font-size: var(--step-1);
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 52ch;
  font-size: var(--step--1);
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-crew,
  .page-about .about-creds {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 940px) {
  .page-about .about-split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-main {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-note {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: 7rem;
  }
}

@media (min-width: 1040px) {
  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-index__link:hover {
    transform: none;
  }
}