.page-about {
  background: var(--night);
  color: var(--mist);
  font-family: var(--font-body);
}

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

.page-about dd {
  margin: 0;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 36px) 0 clamp(34px, 6vw, 62px);
  border-bottom: 1px solid var(--hair);
  background:
    radial-gradient(95% 75% at 6% 0%, rgba(18, 62, 56, 0.94) 0%, rgba(11, 42, 46, 0.42) 48%, rgba(7, 12, 16, 0) 78%),
    linear-gradient(180deg, #0B2A2E 0%, #0A1A1C 56%, #070C10 100%);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(30, 58, 63, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 63, 0.5) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
}

.page-about .about-cover .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-cover .crumbs {
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

.page-about .about-cover__inner {
  display: grid;
  gap: clamp(20px, 3.4vw, 40px);
}

.page-about .about-cover__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(28px, 6vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 17ch;
}

.page-about .about-cover__title .hl {
  color: var(--cyan);
  background: linear-gradient(180deg, transparent 64%, var(--grass-16) 64%);
}

.page-about .about-cover__lede {
  margin: 0 0 22px;
  max-width: 46ch;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.9;
  color: rgba(232, 241, 239, 0.78);
}

.page-about .about-cover__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cover__media {
  margin: 0;
  border: 1px solid var(--hair);
  background: var(--field);
}

/* ---------- 首屏数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4.4vw, 44px) 0 0;
  padding: 0;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .about-stats__cell {
  display: flex;
  flex-direction: column;
  background: rgba(14, 23, 29, 0.78);
  padding: 14px 16px 16px;
}

.page-about .about-stats__val {
  order: -1;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-stats__key {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mute);
  letter-spacing: 0.04em;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding-block: clamp(28px, 5vw, 56px);
}

.page-about .about-rail__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--hair);
  border-radius: var(--r);
  background: var(--field);
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--mist);
  border-color: var(--grass);
  background: var(--grass-08);
  outline: none;
}

.page-about .about-rail__num {
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--grass);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(26px, 4.4vw, 46px);
  border-top: 1px solid var(--hair);
  scroll-margin-top: 96px;
}

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

.page-about .sec-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .sec-head__num {
  flex: 0 0 auto;
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--grass);
}

.page-about .sec-head__num::after {
  content: "";
  display: block;
  width: 18px;
  height: 1px;
  margin-top: 8px;
  background: var(--grid);
}

.page-about .sec-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 3.4vw, 30px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.95;
  color: rgba(232, 241, 239, 0.78);
}

.page-about .about-p--tight {
  margin: 0;
  font-size: 13.5px;
}

.page-about .about-p .crumbs__link {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--grass) 0%, var(--cyan) 42%, var(--amber) 76%, rgba(242, 178, 76, 0) 100%);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 24px 34px;
}

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

.page-about .tl__dot {
  position: absolute;
  left: 0;
  top: 2px;
  display: grid;
  place-items: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--grass);
  color: var(--night);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .tl__item:nth-child(2) .tl__dot,
.page-about .tl__item:nth-child(3) .tl__dot {
  background: var(--cyan);
}

.page-about .tl__item:nth-child(4) .tl__dot,
.page-about .tl__item:nth-child(5) .tl__dot {
  background: var(--amber);
}

.page-about .tl__item:nth-child(6) .tl__dot {
  background: var(--yi);
  color: var(--mist);
}

.page-about .tl__item:hover .tl__dot {
  transform: scale(1.16);
  box-shadow: 0 0 0 4px var(--grass-16);
}

.page-about .tl__stage {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--mute);
}

.page-about .tl__title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .tl__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(232, 241, 239, 0.74);
}

/* ---------- 赛季流程条 ---------- */
.page-about .season-flow {
  display: grid;
  gap: 1px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .season-flow__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 16px;
  background: var(--field);
  border-left: 2px solid transparent;
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .season-flow__cell:hover {
  background: #12212A;
  border-left-color: var(--grass);
}

.page-about .season-flow__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .season-flow__name {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .season-flow__desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .about-sec__media {
  margin: clamp(16px, 2.8vw, 26px) 0;
  border: 1px solid var(--hair);
  background: var(--field);
}

/* ---------- 团队分工 ---------- */
.page-about .crew {
  display: grid;
  gap: 10px;
  margin: 18px 0;
  padding: 0;
  list-style: none;
}

.page-about .crew__item {
  position: relative;
  padding: 14px 16px 16px;
  border: 1px solid var(--hair);
  background: rgba(14, 23, 29, 0.62);
}

.page-about .crew__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--grass);
  opacity: 0.62;
}

.page-about .crew__name {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .crew__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(232, 241, 239, 0.72);
}

/* ---------- 服务范围 ---------- */
.page-about .reach {
  display: grid;
  gap: 18px;
  margin-top: 16px;
}

.page-about .dotgrid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .dotgrid__cell {
  padding: 10px 4px 9px;
  border: 1px solid var(--hair);
  background: linear-gradient(180deg, rgba(18, 62, 56, 0.34), rgba(14, 23, 29, 0.86));
  text-align: center;
  font-size: 11.5px;
  line-height: 1.4;
  color: var(--mute);
  letter-spacing: 0.02em;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .dotgrid__cell::before {
  content: "";
  display: block;
  width: 5px;
  height: 5px;
  margin: 0 auto 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 240, 224, 0.12);
}

.page-about .dotgrid__cell:hover {
  color: var(--mist);
  border-color: var(--grass);
}

.page-about .reach__side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .partners {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .partners__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--hair-soft);
}

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

.page-about .partners__val {
  flex: 0 0 auto;
  min-width: 2.4ch;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}

.page-about .partners__text {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(232, 241, 239, 0.76);
}

/* ---------- 认证 ---------- */
.page-about .cert {
  display: grid;
  gap: 1px;
  margin-top: 18px;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .cert__badge {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: clamp(18px, 3.2vw, 28px);
  background:
    repeating-linear-gradient(90deg, rgba(30, 58, 63, 0.5) 0 1px, transparent 1px 14px),
    repeating-linear-gradient(0deg, rgba(30, 58, 63, 0.5) 0 1px, transparent 1px 14px),
    linear-gradient(135deg, #0B2A2E 0%, #123E38 100%);
}

.page-about .cert__ring {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border: 1px solid var(--amber);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--amber);
  box-shadow: inset 0 0 0 4px rgba(242, 178, 76, 0.08), 0 0 0 4px rgba(242, 178, 76, 0.06);
}

.page-about .cert__badge-body {
  min-width: 0;
}

.page-about .cert__badge-title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: clamp(15px, 2.4vw, 18px);
  font-weight: 800;
  color: var(--mist);
}

.page-about .cert__badge-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .cert__cell {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 15px 16px 17px;
  background: var(--field);
}

.page-about .cert__key {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-about .cert__val {
  font-size: 14px;
  line-height: 1.5;
  color: var(--mist);
  font-weight: 600;
  word-break: break-word;
}

.page-about .cert__val--mono {
  font-family: var(--font-mono);
  color: var(--cyan);
  letter-spacing: -0.01em;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(18px, 3.2vw, 30px);
  border: 1px solid var(--hair);
  background: linear-gradient(120deg, rgba(18, 62, 56, 0.7) 0%, rgba(10, 26, 28, 0.9) 62%, rgba(7, 12, 16, 0.96) 100%);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(18px, 3vw, 24px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 13.5px;
  line-height: 1.9;
  color: rgba(232, 241, 239, 0.76);
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 780px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .season-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .season-flow__cell {
    padding: 16px 14px 18px;
  }

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

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

  .page-about .cert__badge {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .reach {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 28px;
  }

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

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
    padding-block: clamp(36px, 5vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    padding-top: 4px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--hair);
  }

  .page-about .about-rail__link {
    position: relative;
    padding: 11px 0 11px 14px;
    border: 0;
    border-radius: 0;
    background: none;
    white-space: normal;
    line-height: 1.5;
    font-size: 12px;
  }

  .page-about .about-rail__link::after {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    width: 1px;
    height: 0;
    background: var(--grass);
    transform: translateY(-50%);
    transition: height 0.25s var(--ease);
  }

  .page-about .about-rail__link:hover::after,
  .page-about .about-rail__link:focus-visible::after {
    height: 100%;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
    border-color: transparent;
    color: var(--mist);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .tl__dot,
  .page-about .season-flow__cell,
  .page-about .dotgrid__cell {
    transition-duration: 0.001ms;
  }

  .page-about .tl__item:hover .tl__dot {
    transform: none;
  }
}