/* =========================================================
   page-about · 品牌使命
   ========================================================= */
.page-about {
  --about-hair: rgba(95, 113, 120, .3);
  --about-hair-soft: rgba(95, 113, 120, .16);
  --about-rail: 196px;
  background: var(--pitch);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 7vw, 84px) 0 clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--about-hair);
  background:
    linear-gradient(118deg, rgba(0, 230, 118, .09) 0%, rgba(0, 230, 118, 0) 44%),
    linear-gradient(302deg, rgba(255, 145, 0, .08) 0%, rgba(255, 145, 0, 0) 40%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -8%;
  width: min(640px, 62%);
  height: 148%;
  background: linear-gradient(202deg, rgba(22, 38, 45, .92), rgba(6, 35, 26, .18));
  clip-path: polygon(36% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -12%;
  bottom: -40%;
  width: min(520px, 58vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 42% 42%, rgba(0, 230, 118, .15), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 4.5vw, 56px);
  align-items: end;
}

.page-about .about-hero__copy {
  max-width: 40em;
  min-width: 0;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: clamp(34px, 6vw, 62px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.page-about .about-num {
  padding-left: 14px;
  border-left: 2px solid var(--signal-line);
}

.page-about .about-num__l {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-num__v {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.05;
  color: var(--white);
}

.page-about .about-num__u {
  margin-left: 4px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--grey);
}

/* ---------- 主体双列 + 粘性目录 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-top: clamp(28px, 4vw, 48px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

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

.page-about .about-toc-wrap {
  display: none;
}

.page-about .about-sec {
  padding: clamp(34px, 5vw, 64px) 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-body__main > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

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

.page-about .about-sec__head {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.24;
  color: var(--white);
}

.page-about .about-sec__head .section__lead {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.72;
  color: var(--grey);
}

.page-about .prose {
  max-width: 38em;
  margin-top: 22px;
  font-size: 17px;
  line-height: 1.78;
  color: var(--grey);
}

.page-about .prose p {
  margin: 0 0 16px;
}

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

.page-about .prose strong {
  color: var(--white);
  font-weight: 600;
}

/* ---------- 三条工作线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 0;
  margin-top: 8px;
}

.page-about .about-line {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 22px 0 22px 0;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-line:last-child {
  border-bottom: 0;
}

.page-about .about-line__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--signal);
  padding-top: 5px;
}

.page-about .about-line__title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 21px;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-line__text {
  grid-column: 2;
  margin: 8px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--grey);
}

/* ---------- 影像 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--stand);
  border: 1px solid var(--about-hair);
}

.page-about .about-figure .media__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel);
}

/* ---------- 版本时间带 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3vw, 36px) 0 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-tl {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 0 0 clamp(26px, 3.4vw, 40px) 0;
}

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

.page-about .about-tl__tick {
  position: absolute;
  left: -30px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(0, 230, 118, .14);
  transition: box-shadow .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-tl--now .about-tl__tick {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 145, 0, .18);
}

.page-about .about-tl__meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-tl__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--signal);
}

.page-about .about-tl--now .about-tl__no {
  color: var(--amber);
}

.page-about .about-tl__era {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel);
}

.page-about .about-tl__title {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: clamp(19px, 2.2vw, 23px);
  line-height: 1.32;
  color: var(--white);
}

.page-about .about-tl--now .about-tl__title {
  color: var(--white);
}

.page-about .about-tl__text {
  margin: 8px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-tl:hover .about-tl__tick,
.page-about .about-tl:focus-within .about-tl__tick {
  box-shadow: 0 0 0 7px rgba(0, 230, 118, .2);
  background: var(--signal-hi);
}

.page-about .about-tl--now:hover .about-tl__tick,
.page-about .about-tl--now:focus-within .about-tl__tick {
  box-shadow: 0 0 0 8px rgba(255, 145, 0, .24);
  background: var(--amber);
}

/* ---------- 赛区坐标带 ---------- */
.page-about .about-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px 6px;
  margin-top: clamp(24px, 3vw, 40px);
  padding: clamp(20px, 3vw, 32px) clamp(12px, 2vw, 22px);
  border: 1px solid var(--about-hair);
  background:
    linear-gradient(rgba(95, 113, 120, .12) 1px, transparent 1px) 0 0 / 100% 36px,
    linear-gradient(90deg, rgba(95, 113, 120, .12) 1px, transparent 1px) 0 0 / 36px 100%,
    var(--stand);
}

.page-about .about-pin {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  padding: 4px 2px;
}

.page-about .about-pin__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(0, 230, 118, .13);
  transition: box-shadow .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-pin__name {
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--grey);
  transition: color .18s var(--ease);
}

.page-about .about-pin:hover .about-pin__dot {
  box-shadow: 0 0 0 7px rgba(0, 230, 118, .2);
  transform: scale(1.1);
}

.page-about .about-pin:hover .about-pin__name {
  color: var(--white);
}

/* ---------- 团队数字 ---------- */
.page-about .about-team__nums {
  display: grid;
  gap: 0;
  margin-top: 12px;
}

.page-about .about-bignum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 14px;
  padding: 24px 0;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-bignum__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(46px, 8vw, 82px);
  line-height: .92;
  letter-spacing: -.03em;
  color: var(--signal);
}

.page-about .about-bignum--amber .about-bignum__v {
  color: var(--amber);
}

.page-about .about-bignum__u {
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--white);
}

.page-about .about-bignum__d {
  grid-column: 2;
  margin: 12px 0 0;
  max-width: 32em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--grey);
}

/* ---------- 合作条目 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 20px 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-fact:first-child {
  border-top: 1px solid var(--about-hair);
}

.page-about .about-fact__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--steel);
  padding-top: 4px;
}

.page-about .about-fact__t {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-fact__t strong {
  color: var(--white);
  font-weight: 600;
}

/* ---------- 接入面板 ---------- */
.page-about .about-join {
  display: grid;
  gap: 26px;
  padding: clamp(22px, 3.4vw, 40px);
  border-color: var(--signal-line);
}

.page-about .about-join__title {
  margin: 10px 0 0;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.24;
  color: var(--white);
}

.page-about .about-join__text {
  margin: 14px 0 0;
  max-width: 32em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-join__copy .btn {
  margin-top: 22px;
}

.page-about .about-join__sub {
  margin: 0;
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-join__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-join__list li {
  position: relative;
  padding: 9px 0 9px 20px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--grey);
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-join__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 18px;
  width: 7px;
  height: 7px;
  background: var(--amber);
}

.page-about .about-join__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--steel);
}

.page-about .about-join__note a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--signal-line);
}

.page-about .about-join__note a:hover {
  color: var(--signal-hi);
  border-bottom-color: var(--signal-hi);
}

/* ---------- 右侧章节索引 ---------- */
.page-about .about-toc {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 16px;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-toc__head {
  margin: 0 0 10px;
  color: var(--steel);
}

.page-about .about-toc .toc__link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: center;
  gap: 6px;
  padding: 6px 8px 6px 0;
  font-size: 14px;
  line-height: 1.4;
  color: var(--steel);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-about .about-toc .toc__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--steel);
}

.page-about .about-toc .toc__link:hover {
  color: var(--white);
}

.page-about .about-toc .toc__link[data-active],
.page-about .about-toc .toc__link[aria-current] {
  color: var(--signal);
}

.page-about .about-toc .toc__link[data-active] .toc__index,
.page-about .about-toc .toc__link[aria-current] .toc__index {
  color: var(--signal);
}

/* ---------- 入场 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

.page-about.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.page-about.js [data-reveal].is-inview {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* =========================================================
   断点：≥ 720px
   ========================================================= */
@media (min-width: 720px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .about-line {
    grid-template-columns: minmax(0, 1fr);
    border-bottom: 0;
    border-top: 2px solid var(--about-hair);
    padding-top: 18px;
  }

  .page-about .about-line__num,
  .page-about .about-line__title,
  .page-about .about-line__text {
    grid-column: 1;
  }

  .page-about .about-line__num {
    grid-row: auto;
    padding-top: 0;
    margin-bottom: 8px;
  }

  .page-about .about-line__text {
    margin-top: 10px;
  }

  .page-about .about-team__nums {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 34px;
  }

  .page-about .about-join {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 30px 40px;
    align-items: start;
  }
}

/* =========================================================
   断点：≥ 1000px
   ========================================================= */
@media (min-width: 1000px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(300px, .9fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-band {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 26px 8px;
  }

  .page-about .about-pin:nth-child(1) { grid-column: 1; grid-row: 2; }
  .page-about .about-pin:nth-child(2) { grid-column: 2; grid-row: 1; }
  .page-about .about-pin:nth-child(3) { grid-column: 3; grid-row: 1; }
  .page-about .about-pin:nth-child(4) { grid-column: 3; grid-row: 2; }
  .page-about .about-pin:nth-child(5) { grid-column: 5; grid-row: 2; }
  .page-about .about-pin:nth-child(6) { grid-column: 2; grid-row: 3; }
  .page-about .about-pin:nth-child(7) { grid-column: 3; grid-row: 3; }
  .page-about .about-pin:nth-child(8) { grid-column: 4; grid-row: 3; }
  .page-about .about-pin:nth-child(9) { grid-column: 2; grid-row: 4; }
  .page-about .about-pin:nth-child(10) { grid-column: 3; grid-row: 4; }
  .page-about .about-pin:nth-child(11) { grid-column: 6; grid-row: 4; }
  .page-about .about-pin:nth-child(12) { grid-column: 1; grid-row: 5; }
  .page-about .about-pin:nth-child(13) { grid-column: 3; grid-row: 5; }
  .page-about .about-pin:nth-child(14) { grid-column: 5; grid-row: 6; }

  .page-about .about-tl {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 4px 22px;
    align-items: start;
  }

  .page-about .about-tl__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding-top: 3px;
  }

  .page-about .about-sec__head {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }
}

/* =========================================================
   断点：≥ 1180px，右侧目录吸附
   ========================================================= */
@media (min-width: 1180px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    gap: clamp(40px, 5vw, 84px);
    align-items: start;
  }

  .page-about .about-toc-wrap {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }
}

/* =========================================================
   断点：窄屏 ≥ 560px 的赛区点阵过渡
   ========================================================= */
@media (min-width: 560px) and (max-width: 999px) {
  .page-about .about-band {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* =========================================================
   窄屏保护
   ========================================================= */
@media (max-width: 420px) {
  .page-about .about-hero__stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .page-about .about-line,
  .page-about .about-fact {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-line__num {
    grid-column: 1;
    grid-row: auto;
    padding-top: 0;
  }

  .page-about .about-line__title,
  .page-about .about-line__text {
    grid-column: 1;
  }

  .page-about .about-fact__n {
    padding-top: 0;
  }

  .page-about .about-fact__t {
    grid-column: 1;
  }
}