.page-about {
  --about-rail: 40px;
  --about-gap: 14px;
  --about-dim: rgba(242, 244, 241, .76);
  --about-dim2: rgba(242, 244, 241, .58);
  --about-shadow: 6px 6px 0 rgba(7, 11, 14, .55);
  background: var(--leyu);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-about .hero-shell {
  position: relative;
  background:
    radial-gradient(680px 340px at 88% 4%, rgba(184, 255, 60, .10), transparent 62%),
    radial-gradient(520px 320px at 6% 96%, rgba(255, 122, 47, .12), transparent 66%),
    var(--leyu);
  border-bottom: 2px solid var(--line);
}

.page-about .hero-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(46, 110, 128, .20) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 110, 128, .20) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: .75;
  pointer-events: none;
}

.page-about .hero-shell > * {
  position: relative;
  z-index: 1;
}

.page-about .hero-shell .crumb {
  padding-top: 22px;
}

.page-about .hero {
  padding: clamp(24px, 4vw, 48px) 0 clamp(44px, 6vw, 84px);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .hero-tag {
  color: var(--signal);
  margin: 0 0 14px;
}

.page-about h1 {
  margin: 0;
  font-size: clamp(32px, 6.4vw, 64px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.02em;
  max-width: 15em;
}

.page-about .hero-lead {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--about-dim);
  max-width: 34em;
}

.page-about .quick-index {
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 2px;
}

.page-about .quick-index a {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 110, 128, .20);
  color: var(--about-dim);
  transition: color .2s ease, padding-left .2s ease;
}

.page-about .quick-index a:hover,
.page-about .quick-index a:focus-visible {
  color: var(--signal);
  padding-left: 4px;
}

.page-about .quick-index .label-mono {
  color: var(--index);
}

.page-about .hero-art {
  position: relative;
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink);
  box-shadow: 10px 10px 0 rgba(7, 11, 14, .6);
}

.page-about .hero-art img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .frame__cap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 5px 10px;
  background: rgba(7, 11, 14, .78);
  color: var(--paper);
  border-left: 3px solid var(--signal);
}

/* ---------- 章节骨架 ---------- */

.page-about .sec {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
  border-bottom: 1px solid rgba(46, 110, 128, .20);
  scroll-margin-top: 96px;
}

.page-about .sec--tl {
  padding-top: 0;
}

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

.page-about .sec-grid {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .sec-rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  align-self: stretch;
  padding-top: 8px;
}

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

.page-about .sec-rule {
  flex: 1 1 auto;
  min-height: 48px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-soft), rgba(46, 110, 128, 0));
}

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

.page-about .sec-kicker {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--index);
}

.page-about .sec-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -.01em;
  max-width: 18em;
}

.page-about .sec-intro {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-dim);
  max-width: 40em;
}

.page-about .sec-body p {
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 全宽横幅 ---------- */

.page-about .band {
  position: relative;
  margin: 0 0 clamp(36px, 5vw, 64px);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(170px, 32vw, 330px);
  object-fit: cover;
  filter: saturate(.9);
}

/* ---------- 时间轴 ---------- */

.page-about .tl {
  list-style: none;
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 30px;
  border-left: 2px solid rgba(46, 110, 128, .42);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 14px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 15px;
  width: 13px;
  height: 13px;
  background: var(--signal);
  border: 2px solid var(--leyu);
  box-shadow: 0 0 0 1px var(--line);
}

.page-about .tl-node {
  background: var(--leyu-2);
  border: 2px solid var(--line);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .tl-node[open] {
  border-color: var(--signal);
}

.page-about .tl-sum {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-sum::after {
  content: "+";
  grid-column: 2;
  justify-self: end;
  color: var(--pulse);
  font-family: var(--mono);
  font-size: 16px;
  line-height: 1;
}

.page-about .tl-node[open] .tl-sum::after {
  content: "−";
}

.page-about .tl-idx {
  color: var(--index);
}

.page-about .tl-name {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  padding: 0 16px 16px 82px;
  color: var(--about-dim);
}

.page-about .tl-node:hover .tl-sum {
  background: rgba(184, 255, 60, .06);
}

/* ---------- 团队分工 ---------- */

.page-about .team-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team-row__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .team-row__num {
  color: var(--signal);
}

.page-about .team-row__name {
  font-size: 15px;
  font-weight: 700;
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .team-row__pct {
  color: var(--index);
}

.page-about .team-row__track {
  position: relative;
  height: 18px;
  border: 2px solid var(--line);
  background: rgba(7, 11, 14, .45);
  box-shadow: 3px 3px 0 rgba(7, 11, 14, .45);
  outline: none;
}

.page-about .team-row__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  transition: width .4s ease;
}

.page-about .team-row__fill--data {
  background: var(--signal);
}

.page-about .team-row__fill--write {
  background: var(--pulse);
}

.page-about .team-row__fill--ops {
  background: var(--index);
}

.page-about .team-row__pop {
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  z-index: 3;
  padding: 7px 11px;
  background: var(--ink);
  border: 1px solid var(--line);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .02em;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}

.page-about .team-row__track:hover .team-row__pop,
.page-about .team-row__track:focus-visible .team-row__pop {
  opacity: 1;
  transform: translateY(0);
}

.page-about .team-row__track:hover,
.page-about .team-row__track:focus-visible {
  border-color: var(--signal);
}

.page-about .daynote {
  margin-top: 44px;
  padding: 20px 20px 22px;
  background: rgba(7, 11, 14, .34);
  border-left: 4px solid var(--pulse);
}

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

.page-about .daynote p {
  margin: 0;
  color: var(--about-dim);
}

/* ---------- 流程步骤 ---------- */

.page-about .steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: none;
}

.page-about .step {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--leyu-2);
  border: 2px solid var(--line);
  box-shadow: var(--about-shadow);
  transition: transform .22s ease, border-color .22s ease;
}

.page-about .step:hover {
  transform: translate(-3px, -3px);
  border-color: var(--signal);
}

.page-about .step-n {
  display: inline-block;
  padding: 3px 8px;
  margin-bottom: 12px;
  background: var(--ink);
  border: 1px solid var(--line);
  color: var(--signal);
}

.page-about .step-t {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .01em;
}

.page-about .step-d {
  margin: 0;
  color: var(--about-dim);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .flow-art {
  position: relative;
  margin: 30px 0 0;
  border: 2px solid var(--line);
  background: var(--ink);
}

.page-about .flow-art img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .flow-tail {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--signal);
  color: var(--about-dim);
  max-width: 42em;
}

/* ---------- 专题体系 ---------- */

.page-about .subj-stats {
  margin-top: 30px;
  display: grid;
  gap: 2px;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .subj-stat {
  padding: 20px 0;
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .subj-stat + .subj-stat {
  border-top: 1px solid rgba(46, 110, 128, .30);
}

.page-about .subj-stat__n {
  font-family: var(--mono);
  font-size: clamp(30px, 6vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  letter-spacing: -.02em;
}

.page-about .subj-stat__l {
  font-size: 14px;
  color: var(--about-dim2);
}

.page-about .subj-cards {
  margin-top: 30px;
  display: grid;
  gap: 14px;
}

.page-about .subj-card {
  padding: 20px 18px 22px;
  background: rgba(7, 11, 14, .28);
  border: 1px solid var(--line);
  border-top: 3px solid var(--pulse);
}

.page-about .subj-card__k {
  margin: 0 0 10px;
  color: var(--index);
}

.page-about .subj-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .subj-card p {
  margin: 0;
  color: var(--about-dim);
  font-size: 14.5px;
}

.page-about .subj-cta {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .subj-cta__hint {
  color: var(--index);
}

/* ---------- 覆盖范围 ---------- */

.page-about .cover-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .cover-item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid rgba(46, 110, 128, .30);
}

.page-about .cover-item:last-child {
  border-bottom: 1px solid rgba(46, 110, 128, .30);
}

.page-about .cover-item .status {
  margin-top: 8px;
}

.page-about .cover-item h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 800;
}

.page-about .cover-item p {
  margin: 0;
  color: var(--about-dim);
  font-size: 14.5px;
  max-width: 40em;
}

.page-about .cover-next {
  margin: 24px 0 0;
  color: var(--about-dim2);
  font-size: 14.5px;
}

.page-about .cover-next a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 60, .45);
  padding-bottom: 1px;
}

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

/* ---------- 长期三件事 ---------- */

.page-about .pillars {
  margin-top: 30px;
  display: grid;
  gap: 0;
  border: 2px solid var(--line);
  background: rgba(7, 11, 14, .30);
}

.page-about .pillar {
  padding: 24px 18px 26px;
  border-bottom: 1px solid rgba(46, 110, 128, .30);
}

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

.page-about .pillar__n {
  display: block;
  margin-bottom: 12px;
  color: var(--pulse);
}

.page-about .pillar h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
}

.page-about .pillar p {
  margin: 0;
  color: var(--about-dim);
  font-size: 14.5px;
  max-width: 34em;
}

.page-about .closing {
  margin-top: 40px;
  padding: 26px 20px 28px;
  background: linear-gradient(140deg, rgba(184, 255, 60, .12), rgba(255, 122, 47, .10) 70%, transparent);
  border: 2px solid var(--line);
}

.page-about .closing__line {
  margin: 0;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.75;
  font-weight: 600;
  max-width: 34em;
}

.page-about .closing__acts {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .quick-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 26px;
  }

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

  .page-about .subj-stat + .subj-stat {
    border-top: 0;
    border-left: 1px solid rgba(46, 110, 128, .30);
    padding-left: 24px;
  }

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

@media (min-width: 760px) {
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

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

  .page-about .pillar {
    border-bottom: 0;
    border-right: 1px solid rgba(46, 110, 128, .30);
  }

  .page-about .pillar:last-child {
    border-right: 0;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail: 88px;
    --about-gap: 34px;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: end;
  }

  .page-about .hero-art {
    margin-bottom: 6px;
  }

  .page-about .sec-num {
    font-size: 13px;
  }

  .page-about .cover-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 34px;
    border-top: 0;
  }

  .page-about .cover-item {
    border-top: 1px solid rgba(46, 110, 128, .30);
  }

  .page-about .cover-item:nth-last-child(-n + 2) {
    border-bottom: 1px solid rgba(46, 110, 128, .30);
  }

  .page-about .flow-art {
    max-width: 760px;
  }
}

@media (min-width: 1100px) {
  .page-about .sec-body {
    max-width: 940px;
  }
}

.page-about {
  --w: 1rem;
}