.page-about {
  --about-bevel: 22px;
  --about-hair: rgba(169, 183, 196, 0.16);
  --about-line: rgba(24, 63, 99, 0.95);
  --about-panel-bg: rgba(14, 42, 69, 0.72);
  background: var(--abyss);
  color: var(--silver);
  padding-bottom: 56px;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  color: var(--mist);
  font-family: var(--font-sans);
}

.page-about .stat-mono {
  font-family: var(--font-mono);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: 18px 0 4px;
}

.page-about .about-crumbs ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(169, 183, 196, 0.75);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(46, 100, 147, 0.9);
}

.page-about .about-crumbs a {
  color: rgba(169, 183, 196, 0.75);
  text-decoration: none;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 56px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -35%;
  right: -12%;
  width: min(760px, 88vw);
  height: 165%;
  background: linear-gradient(158deg, rgba(47, 212, 200, 0.18), rgba(46, 100, 147, 0.3) 46%, rgba(255, 106, 43, 0.14));
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(169, 183, 196, 0.05) 0 1px, transparent 1px 6px);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: end;
}

.page-about .about-hero__kicker {
  margin: 0;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 16ch;
  font-size: clamp(34px, 8vw, 74px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__aside {
  position: relative;
  padding: 22px 20px 22px;
  background: linear-gradient(165deg, rgba(24, 63, 99, 0.86), rgba(14, 42, 69, 0.94));
  border: 1px solid rgba(47, 212, 200, 0.28);
  box-shadow: var(--shadow-panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-bevel)), calc(100% - var(--about-bevel)) 100%, 0 100%);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid rgba(47, 212, 200, 0.3);
}

.page-about .hero-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 7vw, 34px);
  font-weight: 300;
  line-height: 1;
  color: var(--mist);
}

.page-about .hero-fact__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(169, 183, 196, 0.82);
}

.page-about .hero-facts__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(169, 183, 196, 0.86);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-top: 44px;
}

.page-about .stage-rail {
  border-top: 1px solid var(--about-hair);
  padding-top: 16px;
}

.page-about .stage-rail__title {
  margin: 0 0 12px;
  color: rgba(169, 183, 196, 0.7);
}

.page-about .stage-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stage-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 5px 10px;
  border: 1px solid rgba(24, 63, 99, 0.9);
  color: rgba(169, 183, 196, 0.86);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .stage-link:hover,
.page-about .stage-link:focus-visible {
  color: var(--cyan);
  border-color: rgba(47, 212, 200, 0.6);
}

.page-about .stage-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--surge);
}

.page-about .stage-link:hover .stage-num,
.page-about .stage-link:focus-visible .stage-num {
  color: var(--cyan);
}

.page-about .stage-stack {
  display: grid;
  gap: 26px;
}

/* ---------- 面板 ---------- */
.page-about .stage-panel {
  position: relative;
  padding: 26px 20px 30px;
  background: var(--about-panel-bg);
  border: 1px solid var(--about-line);
  box-shadow: var(--shadow-panel);
  scroll-margin-top: calc(var(--header-h) + 22px);
}

.page-about .stage-panel::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 106, 43, 0));
}

.page-about .stage-panel .panel__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .stage-title {
  margin: 10px 0 0;
  font-size: clamp(23px, 5.4vw, 36px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .stage-lead {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .stage-text p {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .stage-note {
  margin: 20px 0 0;
  padding: 14px 16px;
  background: rgba(7, 26, 43, 0.6);
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.76;
  color: rgba(169, 183, 196, 0.96);
}

.page-about .stage-linkline {
  margin: 20px 0 0;
}

.page-about .text-link {
  display: inline-block;
  color: var(--cyan);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 212, 200, 0.4);
  padding-bottom: 2px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--orange);
  border-color: rgba(255, 106, 43, 0.7);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid rgba(24, 63, 99, 0.95);
  background: rgba(7, 26, 43, 0.7);
}

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

.page-about .about-figure .media-frame__caption {
  padding: 10px 14px;
  border-top: 1px solid rgba(24, 63, 99, 0.9);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(169, 183, 196, 0.72);
}

/* ---------- 引用 ---------- */
.page-about .pull {
  margin: 24px 0 0;
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--orange);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 三条内容线 ---------- */
.page-about .line-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .line-item {
  padding: 20px 0 20px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .line-idx {
  display: block;
  margin: 0;
  color: var(--surge);
}

.page-about .line-title {
  margin: 8px 0 0;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.01em;
}

.page-about .line-body {
  margin: 10px 0 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 赛区 ---------- */
.page-about .region-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .region-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 14px;
  background: linear-gradient(90deg, rgba(24, 63, 99, 0.8), rgba(14, 42, 69, 0.55));
  border: 1px solid rgba(24, 63, 99, 0.9);
  color: var(--mist);
  font-size: 15px;
  text-decoration: none;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .region-link:hover,
.page-about .region-link:focus-visible {
  transform: translateX(4px);
  border-color: rgba(47, 212, 200, 0.6);
  background: linear-gradient(90deg, rgba(24, 63, 99, 0.95), rgba(14, 42, 69, 0.7));
}

.page-about .region-name {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .region-idx {
  color: var(--surge);
}

.page-about .region-link:hover .region-idx,
.page-about .region-link:focus-visible .region-idx {
  color: var(--cyan);
}

.page-about .about-strip {
  margin-top: 22px;
  border-top: 1px solid rgba(47, 212, 200, 0.28);
  border-bottom: 1px solid rgba(47, 212, 200, 0.28);
  background: rgba(7, 26, 43, 0.55);
}

.page-about .about-strip .stat__value {
  font-family: var(--font-mono);
  font-weight: 300;
}

/* ---------- 数据流程 ---------- */
.page-about .split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 18px;
}

.page-about .flow-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .flow-item {
  position: relative;
  padding: 14px 16px 14px 18px;
  background: rgba(7, 26, 43, 0.55);
  border: 1px solid rgba(24, 63, 99, 0.9);
  border-left: 2px solid var(--surge);
}

.page-about .flow-idx {
  display: block;
  margin: 0;
  color: var(--cyan);
}

.page-about .flow-body {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .split__figure {
  margin-top: 0;
}

/* ---------- 团队标签墙 ---------- */
.page-about .label-wall {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .label-card {
  position: relative;
  padding: 18px 16px 18px;
  background: rgba(237, 243, 248, 0.05);
  border: 1px solid rgba(169, 183, 196, 0.22);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .label-num {
  margin: 14px 0 0;
  font-size: clamp(32px, 9vw, 44px);
  font-weight: 300;
  line-height: 1;
  color: var(--orange);
}

.page-about .label-body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--silver);
}

/* ---------- 合作方 ---------- */
.page-about .partner-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 22px 0 0;
  background: rgba(24, 63, 99, 0.9);
  border: 1px solid rgba(24, 63, 99, 0.9);
}

.page-about .partner-cell {
  padding: 18px 16px;
  background: rgba(7, 26, 43, 0.92);
}

.page-about .partner-num {
  margin: 0;
  font-size: 30px;
  font-weight: 300;
  line-height: 1;
  color: var(--cyan);
}

.page-about .partner-name {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(169, 183, 196, 0.88);
}

/* ---------- 收束区块 ---------- */
.page-about .stage-panel--closing {
  background: linear-gradient(160deg, rgba(24, 63, 99, 0.78), rgba(7, 26, 43, 0.92));
  border-color: rgba(255, 106, 43, 0.35);
}

.page-about .start-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .start-card {
  padding: 18px 16px;
  background: rgba(3, 17, 28, 0.55);
  border: 1px solid rgba(24, 63, 99, 0.95);
}

.page-about .start-body {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .start-mail {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist);
  word-break: break-all;
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 34px 0 68px;
  }

  .page-about .stage-panel {
    padding: 34px 32px 38px;
  }

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

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

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

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

  .page-about .line-item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 20px;
  }

  .page-about .line-idx {
    grid-row: 1 / span 2;
    padding-top: 9px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.8fr);
    gap: 52px;
  }

  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 58px;
    padding-top: 66px;
  }

  .page-about .stage-rail {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    align-self: start;
    border-top: 0;
    padding-top: 0;
  }

  .page-about .stage-list {
    display: block;
    padding-left: 20px;
    position: relative;
  }

  .page-about .stage-list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(180deg, rgba(47, 212, 200, 0.55), rgba(24, 63, 99, 0.9));
  }

  .page-about .stage-link {
    position: relative;
    display: flex;
    width: 100%;
    padding: 9px 0;
    border: 0;
    background: none;
  }

  .page-about .stage-link::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 16px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--flow);
    box-shadow: 0 0 0 4px var(--abyss);
    transition: background 0.25s var(--ease);
  }

  .page-about .stage-link:hover::before,
  .page-about .stage-link:focus-visible::before {
    background: var(--cyan);
  }

  .page-about .split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 30px;
    align-items: start;
  }

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

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

  .page-about .stage-panel:nth-child(even) {
    margin-left: 44px;
  }

  .page-about .stage-panel:nth-child(3n) {
    margin-right: 28px;
  }

  .page-about .stage-panel--wide {
    margin-left: 0;
  }
}

@media (min-width: 1200px) {
  .page-about .stage-panel {
    padding: 40px 44px 44px;
  }

  .page-about .about-hero__lede {
    font-size: 17.5px;
  }

  .page-about .stage-text p,
  .page-about .stage-lead {
    font-size: 15.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region-link,
  .page-about .stage-link,
  .page-about .text-link {
    transition: none;
  }
}