/* ============================================================
   看台自述 / about  —  页面专属样式（作用域 .page-about）
   ============================================================ */

.page-about {
  --abt-axis: 10px;
  --abt-sec-pad: clamp(52px, 7vw, 96px);
  --abt-radius: 0px;
  background-color: var(--void);
  color: var(--chalk);
  font-family: var(--font-sans);
}

/* ---------- 通用文字块 ---------- */
.page-about .abt-prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .abt-prose p {
  margin: 0 0 1.1em;
}

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

.page-about .abt-sec__label {
  display: inline-block;
  position: relative;
  margin-bottom: 14px;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .abt-sec__label::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--coral);
  transform: translateY(-50%) rotate(45deg);
}

.page-about .abt-sec__title {
  margin: 0;
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.16;
  color: var(--chalk);
}

.page-about .abt-sec__title::after {
  content: "";
  display: block;
  width: 46px;
  height: 4px;
  margin-top: 16px;
  background: var(--neon);
}

.page-about .abt-sec__lede {
  max-width: 60ch;
  margin: 20px 0 0;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .abt-sec {
  position: relative;
  padding: var(--abt-sec-pad) 0;
  border-top: 2px solid var(--steel);
}

.page-about .abt-sec__head--wide {
  margin-bottom: clamp(28px, 4vw, 48px);
}

/* ============================================================
   开篇
   ============================================================ */
.page-about .abt-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4vw, 48px) 0 clamp(40px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 85% -10%, rgba(35, 240, 212, .1), transparent 62%),
    radial-gradient(80% 70% at 0% 100%, rgba(255, 107, 74, .08), transparent 60%),
    var(--void);
}

.page-about .abt-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(35, 240, 212, .05) 0 2px,
    transparent 2px 16px
  );
  pointer-events: none;
}

.page-about .abt-hero::after {
  content: "";
  position: absolute;
  right: -60px;
  top: 12%;
  width: 240px;
  height: 240px;
  border: 2px solid var(--steel);
  transform: rotate(6deg);
  pointer-events: none;
}

.page-about .abt-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .abt-crumb {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .abt-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-about .abt-crumb__item + .abt-crumb__item::before {
  content: "/";
  margin-right: 10px;
  color: var(--steel);
}

.page-about .abt-slash {
  display: inline-block;
  margin: 0 0 20px -4px;
  padding: 7px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
  background: rgba(35, 240, 212, .1);
  border: 2px solid var(--neon);
  clip-path: polygon(13px 0, 100% 0, calc(100% - 13px) 100%, 0 100%);
  transform: rotate(-4deg);
}

.page-about .abt-hero__title {
  margin: 0 0 22px;
  font-size: clamp(38px, 7.4vw, 82px);
  font-weight: 900;
  letter-spacing: -.028em;
  line-height: 1.02;
  color: var(--chalk);
}

.page-about .abt-hero__accent {
  color: var(--coral);
}

.page-about .abt-hero__lede {
  max-width: 62ch;
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .abt-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding: 2px;
  list-style: none;
  background: var(--steel);
  border: 2px solid var(--steel);
}

.page-about .abt-fact {
  padding: 18px 16px;
  background: var(--void);
}

.page-about .abt-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--neon);
}

.page-about .abt-fact--coral .abt-fact__num {
  color: var(--coral);
}

.page-about .abt-fact__unit {
  margin-left: 4px;
  font-size: .44em;
  letter-spacing: .02em;
}

.page-about .abt-fact__key {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--haze);
}

/* ============================================================
   起点
   ============================================================ */
.page-about .abt-grid--origin {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
}

/* ============================================================
   四条内容主线
   ============================================================ */
.page-about .abt-lines {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: abt-line;
}

.page-about .abt-line {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 4px 16px;
  padding: 24px 0 24px 16px;
  border-top: 2px solid var(--steel);
  border-left: 2px solid var(--steel);
  transition: border-left-color .15s var(--ease), background-color .15s var(--ease);
}

.page-about .abt-line:last-child {
  border-bottom: 2px solid var(--steel);
}

.page-about .abt-line:hover,
.page-about .abt-line:focus-within {
  border-left-color: var(--neon);
  background-color: var(--stand);
}

.page-about .abt-line__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--steel);
  transition: color .15s var(--ease);
}

.page-about .abt-line:hover .abt-line__no,
.page-about .abt-line:focus-within .abt-line__no {
  color: var(--neon);
}

.page-about .abt-line__name {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--chalk);
}

.page-about .abt-line__desc {
  max-width: 64ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--haze);
}

.page-about .abt-line__meta {
  grid-column: 2;
  display: inline-block;
  margin-top: 12px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .09em;
  color: var(--neon);
  border: 1px solid var(--neon-dim);
  align-self: start;
  justify-self: start;
}

/* ============================================================
   团队
   ============================================================ */
.page-about .abt-roster {
  display: grid;
  gap: clamp(30px, 4.5vw, 60px);
}

.page-about .abt-roles {
  margin-top: clamp(26px, 3.5vw, 40px);
}

.page-about .abt-role {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 16px 0 16px 18px;
  border-left: 2px solid var(--steel);
  border-bottom: 1px solid var(--steel);
  transition: border-left-color .15s var(--ease), background-color .15s var(--ease);
}

.page-about .abt-role:last-child {
  border-bottom: none;
}

.page-about .abt-role:hover,
.page-about .abt-role:focus-within {
  border-left-color: var(--neon);
  background-color: var(--stand);
}

.page-about .abt-role__num {
  flex: 0 0 auto;
  min-width: 2.1em;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--neon);
}

.page-about .abt-role__name {
  margin: 2px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .abt-role__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.68;
  color: var(--haze);
}

.page-about .abt-roster__figure {
  margin: 0;
  border: 2px solid var(--steel);
  background: var(--stand);
  box-shadow: 8px 8px 0 rgba(35, 240, 212, .16);
}

.page-about .abt-roster__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  filter: saturate(.9) contrast(1.05);
}

.page-about .abt-roster__cap {
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--haze);
  border-top: 2px solid var(--steel);
}

/* ============================================================
   比赛日流程
   ============================================================ */
.page-about .abt-flow {
  margin-top: clamp(10px, 2vw, 24px);
}

.page-about .abt-flow__track {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .abt-flow__grid {
  display: grid;
  gap: 2px;
  background: var(--steel);
  border: 2px solid var(--steel);
}

.page-about .abt-flow__item {
  padding: 24px 20px 26px;
  background: var(--void);
  border-left: 2px solid transparent;
  transition: background-color .15s var(--ease), border-left-color .15s var(--ease);
}

.page-about .abt-flow__item:hover,
.page-about .abt-flow__item:focus-within {
  background: var(--stand);
  border-left-color: var(--neon);
}

.page-about .abt-flow__item--coral:hover,
.page-about .abt-flow__item--coral:focus-within {
  border-left-color: var(--coral);
}

.page-about .abt-flow__tag {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--neon);
  border: 1px solid var(--neon-dim);
}

.page-about .abt-flow__tag--coral {
  color: var(--coral);
  border-color: var(--coral);
}

.page-about .abt-flow__title {
  margin: 14px 0 6px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--chalk);
}

.page-about .abt-flow__time {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--coral);
}

.page-about .abt-flow__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--haze);
}

/* ============================================================
   发展时间线
   ============================================================ */
.page-about .abt-sec--timeline {
  position: relative;
  overflow: hidden;
}

.page-about .abt-tl__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .abt-tl__bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: .16;
  filter: saturate(.7);
}

.page-about .abt-tl__inner {
  position: relative;
  z-index: 1;
}

.page-about .abt-tl {
  position: relative;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .abt-tl::before {
  content: "";
  position: absolute;
  left: var(--abt-axis);
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--steel);
}

.page-about .abt-tl__node {
  position: relative;
  padding: 0 0 34px 42px;
}

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

.page-about .abt-tl__node::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 18px;
  height: 18px;
  background: var(--void);
  border: 2px solid var(--neon);
  transform: rotate(45deg);
  transition: background-color .15s var(--ease), box-shadow .15s var(--ease);
}

.page-about .abt-tl__node:hover::before,
.page-about .abt-tl__node:focus-within::before {
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(35, 240, 212, .18);
}

.page-about .abt-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--neon);
}

.page-about .abt-tl__head {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .abt-tl__text {
  max-width: 46ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--haze);
  transition: color .15s var(--ease);
}

.page-about .abt-tl__node:hover .abt-tl__text {
  color: var(--chalk);
}

/* ============================================================
   数据与合作
   ============================================================ */
.page-about .abt-data {
  display: grid;
  gap: clamp(30px, 4.5vw, 60px);
}

.page-about .abt-data__text > p {
  max-width: 62ch;
  margin: 22px 0 0;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .abt-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 2px;
  list-style: none;
  background: var(--steel);
  border: 2px solid var(--steel);
}

.page-about .abt-metric {
  padding: 16px;
  background: var(--stand);
}

.page-about .abt-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--chalk);
}

.page-about .abt-metric__unit {
  margin-left: 3px;
  font-size: .48em;
  color: var(--coral);
}

.page-about .abt-metric__key {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--haze);
}

.page-about .abt-data__figure {
  position: relative;
  margin: 0;
  border: 2px solid var(--steel);
  background: var(--void);
  box-shadow: 8px 8px 0 rgba(255, 107, 74, .18);
}

.page-about .abt-data__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .abt-data__cap {
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--haze);
  border-top: 2px solid var(--steel);
}

/* ============================================================
   收束
   ============================================================ */
.page-about .abt-close {
  padding: var(--abt-sec-pad) 0 clamp(56px, 8vw, 104px);
  border-top: 2px solid var(--steel);
  background:
    linear-gradient(180deg, rgba(35, 240, 212, .07), transparent 70%),
    var(--void);
}

.page-about .abt-close__inner {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .abt-close__text > p {
  max-width: 60ch;
  margin: 22px 0 0;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .abt-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 620px) {
  .page-about .abt-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .abt-line {
    grid-template-columns: 56px 1fr auto;
    align-items: start;
    gap: 6px 22px;
  }

  .page-about .abt-line__no {
    grid-row: auto;
    font-size: 24px;
  }

  .page-about .abt-line__meta {
    grid-column: 3;
    margin-top: 4px;
    white-space: nowrap;
  }
}

@media (min-width: 900px) {
  .page-about {
    --abt-axis: 50%;
  }

  .page-about .abt-grid--origin {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    align-items: start;
  }

  .page-about .abt-roster {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .abt-data {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .abt-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  /* 时间轴：左右交替 */
  .page-about .abt-tl::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .abt-tl__node {
    width: calc(50% - 40px);
    padding-left: 0;
    padding-bottom: 48px;
  }

  .page-about .abt-tl__node:nth-child(odd) {
    margin-left: 0;
    text-align: right;
  }

  .page-about .abt-tl__node:nth-child(odd)::before {
    left: auto;
    right: -31px;
  }

  .page-about .abt-tl__node:nth-child(odd) .abt-tl__text {
    margin-left: auto;
  }

  .page-about .abt-tl__node:nth-child(even) {
    margin-left: auto;
  }

  .page-about .abt-tl__node:nth-child(even)::before {
    left: -49px;
    right: auto;
  }
}

@media (min-width: 1120px) {
  .page-about .abt-hero__title {
    max-width: 16ch;
  }

  .page-about .abt-flow__item {
    padding: 30px 26px 34px;
  }
}

/* 减少动态偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .abt-line,
  .page-about .abt-role,
  .page-about .abt-flow__item,
  .page-about .abt-tl__node::before,
  .page-about .abt-tl__text,
  .page-about .abt-line__no {
    transition: none;
  }
}
<<<END>>>