.page-about {
  --about-hair: rgba(30, 74, 107, 0.72);
  --about-hair-soft: rgba(30, 74, 107, 0.42);
  --about-gap: clamp(2.5rem, 6vw, 4.5rem);
  position: relative;
  padding-bottom: clamp(3rem, 8vw, 6rem);
  background-image:
    linear-gradient(to right, rgba(30, 74, 107, 0.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 74, 107, 0.14) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: center top;
}

.page-about .about-link {
  color: var(--fluoro-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, 0.45);
  padding-bottom: 1px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--signal-orange);
  border-bottom-color: var(--signal-orange);
}

/* ---------- 首屏框景 ---------- */

.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: 1.25rem;
  padding: clamp(1.5rem, 4.5vw, 3.25rem);
  border: 1px solid var(--about-hair);
  background:
    linear-gradient(155deg, rgba(13, 36, 56, 0.95) 0%, rgba(7, 26, 43, 0.86) 52%, rgba(7, 26, 43, 0.97) 100%);
  box-shadow: 0 34px 80px -58px rgba(0, 0, 0, 0.95);
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--fluoro-cyan);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: 0.005em;
  margin: 0.75rem 0 1.1rem;
  color: var(--off-white);
  max-width: 20ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 2rem;
  border: 1px solid var(--about-hair-soft);
  background: var(--about-hair-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.95rem 1rem 1.05rem;
  background: rgba(7, 26, 43, 0.9);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--fluoro-cyan);
}

.page-about .about-stat__unit {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--signal-orange);
  margin-left: 0.3rem;
}

.page-about .about-stat__label {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}

.page-about .about-hero__figure {
  margin: 0;
  align-self: stretch;
}

.page-about .about-hero__figure .figure__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-hair-soft);
}

/* ---------- 起点叙述 ---------- */

.page-about .about-origin {
  padding-top: var(--about-gap);
}

.page-about .about-origin__body {
  max-width: 70ch;
  margin-top: 1.25rem;
  border-left: 1px solid var(--about-hair);
  padding-left: clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-origin__body p {
  margin: 0 0 1.1rem;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--ink-soft);
}

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

/* ---------- 版本时间轴 ---------- */

.page-about .about-versions {
  padding-top: var(--about-gap);
}

.page-about .about-track {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-track__item {
  position: relative;
  padding: 1.4rem 0 1.4rem 1.9rem;
  border-bottom: 1px solid var(--about-hair-soft);
  border-left: 1px solid var(--about-hair-soft);
  transition: border-left-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 1.85rem;
  width: 8px;
  height: 8px;
  background: var(--deep-space-blue);
  border: 1px solid var(--fluoro-cyan);
  transform: rotate(45deg);
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-track__item:hover,
.page-about .about-track__item:focus,
.page-about .about-track__item:focus-within {
  background: linear-gradient(90deg, rgba(13, 36, 56, 0.85), rgba(7, 26, 43, 0));
  border-left-color: var(--fluoro-cyan);
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus::before,
.page-about .about-track__item:focus-within::before {
  background: var(--fluoro-cyan);
}

.page-about .about-track__item:focus {
  outline: none;
}

.page-about .about-track__item:focus-visible {
  outline: 1px solid var(--fluoro-cyan);
  outline-offset: 6px;
}

.page-about .about-track__year {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.5rem;
}

.page-about .about-track__year .num {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  letter-spacing: -0.01em;
  color: var(--off-white);
}

.page-about .about-track__title {
  margin: 0;
  font-size: var(--fs-16);
  font-weight: 600;
  line-height: 1.5;
  color: var(--off-white);
}

.page-about .about-track__more {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--ink-soft);
  transition: max-height 0.4s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
}

.page-about .about-track__item:hover .about-track__more,
.page-about .about-track__item:focus .about-track__more,
.page-about .about-track__item:focus-within .about-track__more {
  max-height: 14rem;
  margin-top: 0.65rem;
  opacity: 1;
}

/* ---------- 六类赛事 ---------- */

.page-about .about-scope {
  padding-top: var(--about-gap);
}

.page-about .about-scope__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 1.75rem;
  border: 1px solid var(--about-hair-soft);
  background: var(--about-hair-soft);
}

.page-about .about-scope__cell {
  padding: 1.25rem 1.3rem 1.4rem;
  background: var(--panel-navy);
  transition: background-color 0.3s var(--ease);
}

.page-about .about-scope__cell:hover {
  background: rgba(19, 48, 72, 0.95);
}

.page-about .about-scope__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--moss-green);
  margin-bottom: 0.55rem;
}

.page-about .about-scope__name {
  margin: 0 0 0.5rem;
  font-size: var(--fs-16);
  font-weight: 600;
  color: var(--off-white);
}

.page-about .about-scope__cell p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-scope__note {
  margin: 1.5rem 0 0;
  max-width: 74ch;
  padding: 1rem 1.15rem;
  border-left: 2px solid var(--signal-orange);
  background: rgba(13, 36, 56, 0.6);
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 九区地图 ---------- */

.page-about .about-viz {
  padding-top: var(--about-gap);
}

.page-about .about-viz__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: 1.75rem;
}

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

.page-about .about-viz__figure .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--about-hair-soft);
}

.page-about .about-zones {
  display: block;
  width: 100%;
  max-width: 360px;
  height: auto;
  margin: 0 auto;
  overflow: visible;
}

.page-about .about-zone rect {
  stroke: rgba(7, 26, 43, 0.95);
  stroke-width: 1;
  transition: filter 0.25s var(--ease), stroke 0.25s var(--ease), stroke-width 0.25s var(--ease);
}

.page-about .about-zone text {
  font-family: var(--font-body);
  font-size: 13px;
  text-anchor: middle;
  dominant-baseline: central;
  fill: var(--off-white);
  pointer-events: none;
}

.page-about .about-zone:hover rect,
.page-about .about-zone:focus-visible rect {
  filter: brightness(1.4);
  stroke: var(--fluoro-cyan);
  stroke-width: 2;
}

.page-about .about-zone:focus {
  outline: none;
}

.page-about .zone--hot {
  fill: rgba(255, 107, 44, 0.72);
}

.page-about .zone--hot-soft {
  fill: rgba(255, 107, 44, 0.48);
}

.page-about .zone--warm {
  fill: rgba(200, 107, 74, 0.55);
}

.page-about .zone--mid {
  fill: rgba(112, 140, 91, 0.5);
}

.page-about .zone--mid-deep {
  fill: rgba(112, 140, 91, 0.7);
}

.page-about .zone--cool {
  fill: rgba(31, 107, 74, 0.7);
}

.page-about .zone--cool-deep {
  fill: rgba(31, 107, 74, 0.92);
}

.page-about .about-zones__legend {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-zones__legend li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-zones__chip {
  flex: none;
  width: 18px;
  height: 10px;
  border: 1px solid rgba(242, 240, 232, 0.25);
}

.page-about .about-zones__chip--hot {
  background: linear-gradient(90deg, rgba(255, 107, 44, 0.7), rgba(200, 107, 74, 0.5));
}

.page-about .about-zones__chip--mid {
  background: linear-gradient(90deg, rgba(112, 140, 91, 0.7), rgba(112, 140, 91, 0.4));
}

.page-about .about-zones__chip--cool {
  background: linear-gradient(90deg, rgba(31, 107, 74, 0.9), rgba(31, 107, 74, 0.55));
}

.page-about .about-viz__text p {
  margin: 0 0 1.05rem;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 62ch;
}

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

/* ---------- 团队与流程 ---------- */

.page-about .about-team {
  padding-top: var(--about-gap);
}

.page-about .about-team__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: 1.75rem;
}

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

.page-about .about-team__figure .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-hair-soft);
}

.page-about .about-team__note {
  margin: 1.25rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 62ch;
}

/* ---------- 合作与荣誉 ---------- */

.page-about .about-partners {
  padding-top: var(--about-gap);
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 1.75rem;
  border: 1px solid var(--about-hair-soft);
  background: var(--about-hair-soft);
}

.page-about .about-partners__cell {
  padding: 1.4rem 1.35rem 1.5rem;
  background: var(--panel-navy);
}

.page-about .about-partners__cell--award {
  background: linear-gradient(135deg, rgba(255, 107, 44, 0.14), rgba(13, 36, 56, 0.98) 62%);
}

.page-about .about-partners__figure {
  display: block;
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--fluoro-cyan);
  margin-bottom: 0.7rem;
}

.page-about .about-partners__cell--award .about-partners__figure {
  margin-bottom: 0.55rem;
  font-size: var(--fs-14);
  color: var(--signal-orange);
}

.page-about .about-partners__name {
  margin: 0 0 0.55rem;
  font-size: var(--fs-16);
  font-weight: 600;
  line-height: 1.5;
  color: var(--off-white);
}

.page-about .about-partners__cell p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 行动区 ---------- */

.page-about .about-start {
  margin-top: var(--about-gap);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border: 1px solid var(--about-hair);
  background:
    linear-gradient(120deg, rgba(31, 107, 74, 0.22) 0%, rgba(13, 36, 56, 0.9) 45%, rgba(7, 26, 43, 0.98) 100%);
  display: grid;
  gap: 1.75rem;
}

.page-about .about-start__title {
  margin: 0.75rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  line-height: 1.2;
  color: var(--off-white);
}

.page-about .about-start__main p {
  margin: 0 0 1rem;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 66ch;
}

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

.page-about .about-start__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-track__item {
    display: grid;
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 1.5rem;
    padding: 1.6rem 1.5rem 1.6rem 2.1rem;
  }

  .page-about .about-track__year {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
    margin-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: stretch;
  }

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

  .page-about .about-viz__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-viz__figure {
    grid-row: span 2;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-start {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2.5rem;
  }

  .page-about .about-start__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1040px) {
  .page-about .about-partners__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-zones {
    max-width: 100%;
  }
}