.page-about {
  --about-rail-w: 140px;
  --about-gap: 44px;
  --about-line: rgba(36, 26, 18, .18);
  --about-line-dark: rgba(243, 235, 221, .22);
  background: var(--ink);
  color: var(--cream);
  padding-top: var(--bar-h);
  overflow-x: clip;
}

.page-about .about-body {
  padding: 32px 0 88px;
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

/* ---------- 左侧赛季刻度 ---------- */
.page-about .about-rail {
  display: none;
}

/* ---------- 内容流 ---------- */
.page-about .about-stream {
  min-width: 0;
}

.page-about .about-crumb {
  margin-bottom: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border: 2px solid var(--rule-2);
  background:
    linear-gradient(135deg, rgba(43, 242, 208, .09), transparent 46%),
    linear-gradient(200deg, rgba(255, 154, 46, .07), transparent 60%),
    var(--panel);
  box-shadow: var(--shadow-hard);
  padding: 30px 22px 32px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 56px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 8.4vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 14px 0 18px;
  color: var(--cream);
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(243, 235, 221, .82);
  max-width: 40em;
  margin: 0 0 26px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 26px;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-line-dark);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px 24px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-hero__facts .data-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(34px, 8vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-hero__facts .data-num__unit {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--steel);
}

.page-about .about-hero__link {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 奶油纸面板 ---------- */
.page-about .about-panel {
  position: relative;
  background: var(--cream);
  color: var(--brown);
  border: 2px solid var(--brown);
  box-shadow: var(--shadow-hard);
  padding: 30px 22px 34px;
  margin-top: 30px;
}

.page-about .about-panel, .page-about .about-panel * {
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-about .about-panel__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 8px;
  align-items: start;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--brown);
  margin-bottom: 24px;
}

.page-about .about-panel__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .08em;
  color: #fff;
  background: var(--red);
  padding: 3px 7px 2px;
  line-height: 1.4;
}

.page-about .about-panel__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 5.2vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--brown);
}

.page-about .about-panel__meta {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: #7a6a5c;
  margin: 0;
}

.page-about .about-panel__copy p {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 38em;
}

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

.page-about .about-panel__pull {
  border-left: 4px solid var(--amber);
  padding: 4px 0 4px 16px;
  font-size: 17px !important;
  font-weight: 500;
  color: var(--brown);
}

.page-about .about-panel__note {
  font-size: 15px;
  line-height: 1.85;
  color: #5a4a3c;
  margin: 0 0 26px;
  max-width: 42em;
  padding-left: 14px;
  border-left: 3px solid var(--blue);
}

.page-about .about-panel__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

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

/* ---------- 编年节点 ---------- */
.page-about .about-miles {
  border-top: 1px solid var(--about-line);
}

.page-about .about-mile {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-mile__head {
  position: relative;
  display: block;
  padding: 18px 36px 18px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-mile__head::-webkit-details-marker {
  display: none;
}

.page-about .about-mile__head::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--red);
}

.page-about .about-mile[open] .about-mile__head::after {
  content: "\2212";
  color: var(--cyan);
}

.page-about .about-mile[open] .about-mile__head {
  background: rgba(43, 242, 208, .09);
}

.page-about .about-mile__head:hover,
.page-about .about-mile__head:focus-visible {
  background: rgba(228, 82, 43, .08);
}

.page-about .about-mile__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-mile__span {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .09em;
  color: var(--red);
  margin-bottom: 5px;
}

.page-about .about-mile__name {
  display: block;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--brown);
}

.page-about .about-mile__body {
  padding: 0 0 20px;
  border-top: 1px dashed rgba(36, 26, 18, .18);
  padding-top: 14px;
}

.page-about .about-mile__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #4c3f34;
  max-width: 40em;
}

/* ---------- 团队 ---------- */
.page-about .about-crew__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 18px 0 0;
  border-top: 2px solid var(--brown);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 16px;
}

.page-about .about-crew__list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-crew__k {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--red);
  letter-spacing: -0.02em;
}

.page-about .about-crew__v {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: #6d5d4e;
}

/* ---------- 标准 ---------- */
.page-about .about-standard__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-standard__item {
  padding: 20px 0 20px 18px;
  border-bottom: 1px solid var(--about-line);
  border-left: 3px solid var(--blue);
}

.page-about .about-standard__item:nth-child(2n) {
  border-left-color: var(--amber);
}

.page-about .about-standard__item:nth-child(3n) {
  border-left-color: var(--red);
}

.page-about .about-standard__name {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--brown);
  letter-spacing: .01em;
}

.page-about .about-standard__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #4c3f34;
  max-width: 36em;
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-reach__figure {
  margin: 0 0 26px;
}

.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 22px 24px;
  padding-top: 22px;
  border-top: 2px solid var(--brown);
}

.page-about .about-reach__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-reach__stat .data-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 7vw, 48px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brown);
}

.page-about .about-reach__stat .data-num__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .07em;
  color: var(--red);
}

.page-about .about-reach__stat p {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: #5f5145;
}

/* ---------- 合作方 ---------- */
.page-about .about-users__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-users__name {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--brown);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-users__name::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  background: var(--blue);
}

.page-about .about-users__col:nth-child(2n) .about-users__name::before {
  background: var(--yellow);
}

.page-about .about-users__col:nth-child(3n) .about-users__name::before {
  background: var(--red);
}

.page-about .about-users__col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #4c3f34;
  max-width: 38em;
}

.page-about .about-users__band {
  margin-top: 26px;
  background: var(--brown);
  color: var(--cream);
  padding: 22px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 18px 22px;
}

.page-about .about-users__band .data-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 6.4vw, 40px);
  line-height: 1;
  color: var(--amber);
  display: block;
}

.page-about .about-users__band .data-num__unit {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: .05em;
  color: rgba(243, 235, 221, .72);
}

/* ---------- 下一步 ---------- */
.page-about .about-panel--next {
  background: linear-gradient(160deg, #fdf6ea, var(--cream) 62%);
}

.page-about .about-panel--next p {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 40em;
  color: var(--brown);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 2px solid var(--brown);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-panel__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-panel__split--flip .about-panel__media {
    order: -1;
  }

  .page-about .about-standard__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .about-users__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .about-hero {
    padding: 40px 34px 42px;
  }

  .page-about .about-panel {
    padding: 40px 34px 44px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--bar-h) + 44px);
    align-self: start;
    border-left: 1px solid var(--rule-2);
    padding-left: 16px;
  }

  .page-about .about-rail__cap {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--steel);
    margin: 0 0 16px;
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
  }

  .page-about .about-rail__link {
    display: grid;
    grid-template-columns: 24px minmax(0, 1fr);
    gap: 8px;
    align-items: baseline;
    padding: 7px 6px 7px 0;
    text-decoration: none;
    color: rgba(243, 235, 221, .58);
    font-size: 13px;
    line-height: 1.35;
    transition: color var(--t) var(--ease), transform var(--t) var(--ease);
  }

  .page-about .about-rail__num {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--red);
    transition: color var(--t) var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--cyan);
    transform: translateX(6px);
  }

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

  .page-about .about-rail__link:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
  }

  .page-about .about-rail__meta {
    margin: 20px 0 0;
    padding-top: 14px;
    border-top: 1px solid var(--rule);
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.75;
    letter-spacing: .05em;
    color: var(--steel);
  }

  .page-about .about-users__cols {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 26px;
  }

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

  .page-about .about-hero {
    padding: 52px 46px 54px;
  }

  .page-about .about-panel {
    padding: 52px 48px 56px;
  }

  .page-about .about-panel__split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 44px;
  }

  .page-about .about-panel__split--flip {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

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

  .page-about .about-mile__head {
    padding: 22px 46px 22px 0;
  }

  .page-about .about-mile__name {
    font-size: 17px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-hero__title {
    max-width: 16em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-rail__num,
  .page-about .about-mile__head {
    transition: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    transform: none;
  }
}