.page-about {
  --about-rail: 236px;
  --about-chapter-gap: 64px;
  background: var(--navy);
  color: var(--flag-white);
}

/* ---------- 首屏 ---------- */

.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  padding: 34px 0 52px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -18%;
  width: 74%;
  height: 152%;
  background: linear-gradient(132deg, rgba(46, 127, 209, .26), rgba(23, 64, 47, .24) 52%, rgba(11, 29, 58, 0) 78%);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 34%;
  height: 6px;
  background: linear-gradient(90deg, var(--flag-blue), var(--flag-red) 34%, var(--gold) 68%, var(--flag-green));
  pointer-events: none;
}

.page-about .about-masthead .bw-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(247, 249, 252, .58);
}

.page-about .about-breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--flag-blue);
}

.page-about .about-breadcrumb a {
  color: inherit;
  text-decoration: none;
}

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

.page-about .about-masthead__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 13px;
  letter-spacing: .1em;
  color: rgba(247, 249, 252, .72);
}

.page-about .about-masthead__title {
  margin: 0 0 26px;
  max-width: 12em;
  font-size: clamp(2.4rem, 9vw, 5rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--flag-white);
}

.page-about .about-masthead__lead {
  max-width: 60ch;
  margin: 0 0 40px;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(247, 249, 252, .82);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__item {
  background: var(--navy);
  padding: 16px 14px;
}

.page-about .about-stats dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(247, 249, 252, .52);
}

.page-about .about-stats dd {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  font-family: var(--font-num);
  font-size: 26px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-stats .bw-unit {
  font-family: var(--font-body);
  font-size: 12px;
  color: rgba(247, 249, 252, .58);
}

/* ---------- 布局 ---------- */

.page-about .about-layout {
  padding-bottom: 88px;
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin-bottom: 26px;
  padding: 10px 0;
  background: var(--navy);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__label {
  display: none;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex: none;
  padding: 7px 12px;
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  color: rgba(247, 249, 252, .68);
  border: 1px solid var(--line);
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--flag-white);
  border-color: var(--line-strong);
}

.page-about .about-index__no {
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--flag-blue);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--gold);
  border-color: var(--gold);
  background: var(--navy-2);
}

.page-about .about-index__link[aria-current="true"] .about-index__no {
  color: var(--gold);
}

/* ---------- 章节 ---------- */

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

.page-about .about-chapter {
  margin-bottom: var(--about-chapter-gap);
  scroll-margin-top: calc(var(--header-h) + 86px);
}

.page-about .about-chapter__head {
  position: relative;
  overflow: hidden;
  padding: 26px 22px 24px;
  background: var(--navy-2);
  border-left: 3px solid var(--gold);
}

.page-about .about-chapter__head::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -34px;
  width: 190px;
  height: 120px;
  background: linear-gradient(120deg, rgba(232, 178, 58, 0), rgba(232, 178, 58, .16));
  transform: skewX(-20deg);
  pointer-events: none;
}

.page-about .about-chapter__no {
  display: block;
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-chapter__title {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--flag-white);
}

.page-about .about-chapter__note {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(247, 249, 252, .66);
}

.page-about .about-chapter__body {
  padding: 26px 22px;
}

.page-about .bw-text {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
}

.page-about .bw-text:last-of-type {
  margin-bottom: 0;
}

.page-about .about-chapter--dark .bw-text {
  color: rgba(247, 249, 252, .78);
}

.page-about .about-split .bw-text {
  max-width: 46ch;
}

/* ---------- 要点清单 ---------- */

.page-about .about-points {
  display: grid;
  gap: 0;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-ink);
}

.page-about .about-points li {
  position: relative;
  padding: 13px 0 13px 22px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--ink);
  border-bottom: 1px solid var(--line-ink);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 8px;
  height: 8px;
  background: var(--flag-blue);
}

.page-about .about-points li:nth-child(2)::before { background: var(--flag-green); }
.page-about .about-points li:nth-child(3)::before { background: var(--flag-red); }
.page-about .about-points li:nth-child(4)::before { background: var(--flag-yellow); }

.page-about .about-points strong {
  font-weight: 700;
}

/* ---------- 流程章节 ---------- */

.page-about .about-split {
  display: grid;
  gap: 26px;
  margin: 26px 0 0;
}

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

.page-about .about-timeline {
  margin: 36px 0 0;
  padding: 0 0 0 4px;
  list-style: none;
  border-left: 2px solid var(--line);
}

.page-about .about-step {
  position: relative;
  padding: 0 0 30px 26px;
}

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

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--navy);
  border: 2px solid var(--flag-blue);
}

.page-about .about-step--blue::before { border-color: var(--flag-blue); }
.page-about .about-step--green::before { border-color: var(--flag-green); }
.page-about .about-step--red::before { border-color: var(--flag-red); }
.page-about .about-step--gold::before { border-color: var(--gold); }

.page-about .about-step__time {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-step__time .bw-unit {
  font-family: var(--font-body);
  font-size: 12px;
  color: rgba(247, 249, 252, .56);
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.08rem;
  font-weight: 900;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--flag-white);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(247, 249, 252, .72);
}

.page-about .about-wide {
  margin: 38px 0 0;
}

/* ---------- 展开组 ---------- */

.page-about .about-disc {
  margin-top: 0;
  border-bottom: 1px solid var(--line-ink);
}

.page-about .about-disc:first-of-type {
  margin-top: 26px;
  border-top: 1px solid var(--line-ink);
}

.page-about .about-disc > summary {
  display: block;
  padding: 15px 30px 15px 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  position: relative;
  list-style: none;
}

.page-about .about-disc > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-disc > summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 14px;
  font-family: var(--font-num);
  font-size: 19px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-disc[open] > summary::after {
  content: "−";
}

.page-about .about-disc .bw-disclosure__body {
  padding: 0 0 16px;
}

.page-about .about-disc .bw-disclosure__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(16, 20, 24, .8);
}

/* ---------- 引文带 ---------- */

.page-about .about-pull {
  position: relative;
  margin: 0 0 var(--about-chapter-gap);
  padding: 34px 24px;
  background: linear-gradient(102deg, var(--navy-2) 0%, #16345f 46%, var(--turf) 100%);
  border-left: 4px solid var(--gold);
}

.page-about .about-pull__text {
  margin: 0 0 14px;
  max-width: 30ch;
  font-family: var(--font-head);
  font-size: clamp(1.15rem, 3.4vw, 1.55rem);
  font-weight: 900;
  line-height: 1.55;
  letter-spacing: -.01em;
  color: var(--flag-white);
}

.page-about .about-pull__src {
  margin: 0;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
}

/* ---------- 字段条形图 ---------- */

.page-about .about-chart {
  margin-top: 24px;
  padding: 24px 22px;
  background: var(--navy-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--flag-yellow);
}

.page-about .about-chart__title {
  margin: 0 0 22px;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--flag-white);
}

.page-about .about-bar + .about-bar {
  margin-top: 20px;
}

.page-about .about-bar__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 9px;
  font-size: 14px;
  color: var(--flag-white);
}

.page-about .about-bar__val {
  flex: none;
  font-family: var(--font-num);
  font-size: 12px;
  color: rgba(247, 249, 252, .68);
}

.page-about .about-bar__track {
  height: 12px;
  background: rgba(247, 249, 252, .07);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  transition: filter 200ms var(--ease);
}

.page-about .about-bar:hover .about-bar__fill {
  filter: brightness(1.2);
}

.page-about .about-bar__fill--judge {
  width: 27.1%;
  background: var(--flag-blue);
}

.page-about .about-bar__fill--attack {
  width: 51.7%;
  background: var(--flag-green);
}

.page-about .about-bar__fill--roster {
  width: 21.2%;
  background: var(--flag-yellow);
}

.page-about .about-chart__note {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 249, 252, .64);
}

/* ---------- 升级时间轴 ---------- */

.page-about .about-mile {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--line);
}

.page-about .about-mile__item {
  position: relative;
  padding-left: 24px;
}

.page-about .about-mile__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 19px;
  width: 14px;
  height: 14px;
  background: var(--flag-red);
  transform: rotate(45deg);
}

.page-about .about-mile__disc > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid var(--line);
}

.page-about .about-mile__disc > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-mile__disc[open] > summary {
  border-bottom-color: transparent;
}

.page-about .about-mile__year {
  font-family: var(--font-num);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-mile__label {
  font-size: 15px;
  line-height: 1.6;
  color: var(--flag-white);
}

.page-about .about-mile__body {
  padding: 0 0 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-mile__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(247, 249, 252, .72);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: 24px;
  margin-top: 0;
}

.page-about .about-team__text {
  padding: 26px 22px;
}

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

/* ---------- 收尾行动区 ---------- */

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

.page-about .about-quick {
  display: grid;
  gap: 0;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-ink);
}

.page-about .about-quick li {
  display: grid;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-ink);
}

.page-about .about-quick .bw-link {
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.page-about .about-quick__desc {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(16, 20, 24, .68);
}

/* ---------- 图片基线 ---------- */

.page-about .bw-figure {
  background: var(--navy-2);
}

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

.page-about .bw-figure__cap {
  padding: 10px 12px 0;
  font-size: 13px;
  letter-spacing: .04em;
  line-height: 1.6;
  color: rgba(247, 249, 252, .58);
  background: transparent;
}

/* ---------- 桌面 ---------- */

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stats__item {
    padding: 20px 18px;
  }

  .page-about .about-stats dd {
    font-size: 30px;
  }

  .page-about .about-chapter__head {
    padding: 32px 34px 30px;
  }

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

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

  .page-about .about-chart {
    padding: 32px 34px;
  }

  .page-about .about-pull {
    padding: 44px 48px;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 72px;
    align-items: start;
    padding-top: 78px;
  }

  .page-about .about-index {
    top: calc(var(--header-h) + 26px);
    margin-bottom: 0;
    padding: 0 0 0 18px;
    background: transparent;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__label {
    display: block;
    margin: 0 0 16px;
    font-size: 12px;
    letter-spacing: .16em;
    color: rgba(247, 249, 252, .42);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__link {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    align-items: baseline;
    gap: 8px;
    margin-left: -19px;
    padding: 10px 0 10px 16px;
    white-space: normal;
    border: 0;
    border-left: 2px solid transparent;
    background: none;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    color: var(--flag-white);
    border-left-color: var(--line-strong);
  }

  .page-about .about-index__link[aria-current="true"] {
    color: var(--gold);
    background: none;
    border-color: transparent;
    border-left-color: var(--gold);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
    margin-top: 34px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-chapter {
    scroll-margin-top: calc(var(--header-h) + 40px);
  }

  .page-about .about-quick li {
    grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}
</main>>>