.page-about {
  --about-axis: 152px;
  --about-ink-soft: rgba(232, 237, 234, 0.84);
  --about-ink-dim: rgba(124, 154, 162, 0.92);

  position: relative;
  overflow-x: hidden;
  overflow-x: clip;
  background:
    radial-gradient(120% 62% at 84% -6%, rgba(53, 232, 210, 0.11), transparent 62%),
    radial-gradient(88% 56% at -4% 42%, rgba(231, 178, 76, 0.07), transparent 68%),
    var(--ly-abyss);
  color: var(--ly-mist);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(124, 154, 162, 0.075) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(124, 154, 162, 0.075) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 44%, transparent 70%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 44%, transparent 70%);
}

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

/* ---------- 刊头 ---------- */
.page-about .pb-hero {
  padding: clamp(22px, 4vw, 46px) 0 clamp(30px, 5vw, 58px);
  border-bottom: 1px solid var(--ly-line-soft);
}

.page-about .pb-hero__kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: clamp(20px, 3vw, 34px) 0 16px;
  font-family: var(--ly-font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ly-cyan);
}

.page-about .pb-hero__kicker::before {
  content: "";
  flex: none;
  width: 30px;
  height: 2px;
  background: var(--ly-orange);
}

.page-about .pb-hero__title {
  margin: 0;
  max-width: 22em;
  font-family: var(--ly-font-sans);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ly-mist);
  text-wrap: balance;
}

.page-about .pb-hero__mark {
  color: var(--ly-orange);
  white-space: nowrap;
}

.page-about .pb-hero__lead {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .pb-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ly-line-soft);
  border-top: 1px solid var(--ly-line-soft);
  border-bottom: 1px solid var(--ly-line-soft);
}

.page-about .pb-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2vw, 20px) clamp(12px, 1.6vw, 18px);
  background: rgba(9, 47, 56, 0.86);
}

.page-about .pb-fact__n {
  font-family: var(--ly-font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ly-gold);
}

.page-about .pb-fact__l {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--about-ink-dim);
}

/* ---------- 轨迹区 ---------- */
.page-about .pb-track {
  padding: clamp(42px, 7vw, 88px) 0 clamp(28px, 5vw, 56px);
}

.page-about .pb-track__head {
  max-width: 42em;
  margin-bottom: clamp(34px, 5vw, 58px);
}

.page-about .pb-track__head .ly-eyebrow {
  margin: 0 0 12px;
}

.page-about .pb-track__intro {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* 年份刻度线 */
.page-about .tl-track {
  position: relative;
}

.page-about .tl-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 30px;
  width: 1px;
  background: linear-gradient(
    180deg,
    rgba(53, 232, 210, 0.55) 0%,
    rgba(124, 154, 162, 0.28) 46%,
    rgba(231, 178, 76, 0.55) 100%
  );
}

.page-about .tl-node {
  position: relative;
  padding-left: 34px;
  padding-bottom: clamp(40px, 6.5vw, 74px);
}

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

.page-about .tl-node__dot {
  position: absolute;
  left: 0;
  top: 4px;
  z-index: 2;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--ly-cyan);
  background: var(--ly-abyss);
  box-shadow: 0 0 0 4px var(--ly-abyss);
}

.page-about .tl-node--gold .tl-node__dot {
  border-color: var(--ly-gold);
  background: var(--ly-gold);
  box-shadow: 0 0 0 4px var(--ly-abyss), 0 0 18px rgba(231, 178, 76, 0.42);
}

.page-about .tl-node__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 12px;
}

.page-about .tl-node__yr {
  font-family: var(--ly-font-mono);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ly-cyan);
}

.page-about .tl-node--gold .tl-node__yr {
  color: var(--ly-gold);
}

.page-about .tl-node__tag {
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ly-slate);
}

.page-about .tl-node__body {
  max-width: 40em;
}

.page-about .tl-node__body .ly-h3 {
  margin: 0 0 14px;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.36;
  letter-spacing: -0.01em;
  color: var(--ly-mist);
}

.page-about .tl-node__body p {
  margin: 0 0 1.05em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

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

.page-about .pb-num {
  font-family: var(--ly-font-mono);
  font-weight: 700;
  font-size: 1.05em;
  letter-spacing: -0.01em;
  color: var(--ly-gold);
}

/* ---------- 图片 ---------- */
.page-about .pb-media {
  margin: 26px 0 0;
}

.page-about .pb-media__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ly-line);
  background: linear-gradient(145deg, rgba(12, 58, 69, 0.92), rgba(6, 35, 42, 0.96));
  clip-path: polygon(
    var(--ly-cut) 0,
    100% 0,
    100% calc(100% - var(--ly-cut)),
    calc(100% - var(--ly-cut)) 100%,
    0 100%,
    0 var(--ly-cut)
  );
}

.page-about .pb-media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .pb-media__cap {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.65;
  letter-spacing: 0.02em;
  color: var(--ly-slate);
}

.page-about .pb-media--portrait .pb-media__frame { aspect-ratio: 4 / 5; }
.page-about .pb-media--wide .pb-media__frame { aspect-ratio: 2 / 1; }
.page-about .pb-media--band .pb-media__frame { aspect-ratio: 8 / 3; }

/* ---------- 团队分组 ---------- */
.page-about .pb-teams {
  margin: 24px 0 0;
  border-top: 1px solid var(--ly-line-soft);
}

.page-about .pb-team {
  border-bottom: 1px solid var(--ly-line-soft);
  border-left: 2px solid rgba(124, 154, 162, 0.28);
  background: linear-gradient(90deg, rgba(12, 58, 69, 0.55), rgba(12, 58, 69, 0.14));
  transition: border-color 180ms var(--ly-ease), background-color 180ms var(--ly-ease);
}

.page-about .pb-team[open] {
  border-left-color: var(--ly-gold);
}

.page-about .pb-team__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 15px 16px 15px 16px;
  cursor: pointer;
  list-style: none;
  transition: background-color 180ms var(--ly-ease), color 180ms var(--ly-ease);
}

.page-about .pb-team__sum::-webkit-details-marker { display: none; }
.page-about .pb-team__sum::marker { content: ""; }

.page-about .pb-team__sum:hover,
.page-about .pb-team__sum:focus-visible {
  background: rgba(12, 58, 69, 0.72);
}

.page-about .pb-team__n {
  min-width: 2.2em;
  font-family: var(--ly-font-mono);
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
  color: var(--ly-gold);
}

.page-about .pb-team__role {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ly-mist);
}

.page-about .pb-team__hint {
  width: 22px;
  text-align: center;
  font-family: var(--ly-font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--ly-cyan);
}

.page-about .pb-team__hint::before { content: "+"; }
.page-about .pb-team[open] .pb-team__hint::before { content: "−"; }

.page-about .pb-team__body {
  padding: 2px 18px 20px 60px;
}

.page-about .pb-team__body p {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

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

/* ---------- 下一步入口 ---------- */
.page-about .pb-next {
  padding: clamp(38px, 6vw, 74px) 0 clamp(52px, 8vw, 96px);
}

.page-about .pb-next__panel {
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--ly-line);
  background: linear-gradient(150deg, rgba(12, 58, 69, 0.9), rgba(6, 35, 42, 0.95));
  clip-path: polygon(
    calc(var(--ly-cut) * 2) 0,
    100% 0,
    100% calc(100% - var(--ly-cut) * 2),
    calc(100% - var(--ly-cut) * 2) 100%,
    0 100%,
    0 calc(var(--ly-cut) * 2)
  );
}

.page-about .pb-next__panel .ly-eyebrow {
  margin: 0 0 12px;
}

.page-about .pb-next__lead {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .pb-next__grid {
  margin-top: clamp(24px, 3.6vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .pb-next__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 18px;
  text-decoration: none;
  color: var(--ly-mist);
  background: rgba(6, 35, 42, 0.72);
  border: 1px solid var(--ly-line-soft);
  border-top: 2px solid rgba(53, 232, 210, 0.4);
  transition: transform 200ms var(--ly-ease), border-color 200ms var(--ly-ease),
    background-color 200ms var(--ly-ease);
}

.page-about .pb-next__card:hover,
.page-about .pb-next__card:focus-visible {
  transform: translateY(-3px);
  border-top-color: var(--ly-orange);
  background: rgba(12, 58, 69, 0.9);
}

.page-about .pb-next__idx {
  font-family: var(--ly-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ly-slate);
}

.page-about .pb-next__t {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .pb-next__d {
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .pb-next__go {
  font-family: var(--ly-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ly-cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .pb-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .pb-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .tl-track::before {
    left: var(--about-axis);
    bottom: 78px;
  }

  .page-about .tl-node {
    display: grid;
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
    column-gap: 0;
    padding-left: 0;
  }

  .page-about .tl-node__dot {
    left: calc(var(--about-axis) - 7px);
    top: 3px;
  }

  .page-about .tl-node__year {
    grid-column: 1;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    margin: 0;
    padding-right: 20px;
    text-align: right;
    align-self: start;
  }

  .page-about .tl-node__yr {
    font-size: 19px;
  }

  .page-about .tl-node__body {
    grid-column: 2;
  }
}

@media (min-width: 1120px) {
  .page-about .pb-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1140px) {
  .page-about .tl-node--split .tl-node__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(220px, 320px);
    gap: clamp(24px, 3.4vw, 52px);
    max-width: none;
    align-items: start;
  }

  .page-about .tl-node--split .tl-node__text {
    max-width: 38em;
  }

  .page-about .tl-node--split .pb-media {
    margin-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pb-next__card,
  .page-about .pb-team,
  .page-about .pb-team__sum {
    transition: none;
  }

  .page-about .pb-next__card:hover,
  .page-about .pb-next__card:focus-visible {
    transform: none;
  }
}
</main>