.page-about {
  --about-node-pad: 34px;
  --about-line-x: 5px;
  --about-dot: 11px;
  --about-card-cut: 20px;
}

@media (min-width: 900px) {
  .page-about {
    --about-node-pad: 62px;
    --about-line-x: 6px;
    --about-dot: 13px;
  }
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: var(--header-space);
}

.page-about .crumbs {
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 68px);
  align-items: start;
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 62fr) minmax(0, 38fr);
    align-items: end;
  }
}

.page-about .about-hero h1 {
  margin: 12px 0 clamp(20px, 3vw, 32px);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--green);
}

.page-about .about-hero-sub {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  max-width: 46ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  color: var(--mute);
}

.page-about .about-hero-meta {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-hero-aside {
  border-top: 1px solid var(--line-strong);
  padding-top: 20px;
}

.page-about .about-aside-title {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.18em;
  color: var(--mute);
}

.page-about .about-aside-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-aside-list li {
  display: grid;
  grid-template-columns: minmax(76px, auto) minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .about-aside-list .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-hero-band {
  margin-top: clamp(36px, 6vw, 76px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
  background: var(--bg-night);
}

.page-about .about-hero-band img {
  display: block;
  width: 100%;
  height: clamp(180px, 26vw, 340px);
  object-fit: cover;
}

/* ---------- 章节标题 ---------- */

.page-about .about-head {
  max-width: 60ch;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-head .display {
  margin: 10px 0 18px;
}

/* ---------- 阶段跳转 ---------- */

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(34px, 5vw, 62px);
  padding-bottom: clamp(24px, 3vw, 36px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mute);
  text-decoration: none;
  transition: color 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--bg-night);
  background: var(--green);
  border-color: var(--green);
  outline: none;
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-node-pad);
  display: grid;
  gap: clamp(46px, 7vw, 92px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-line-x);
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--green) 0%, var(--ridge) 20%, var(--ridge) 100%);
}

.page-about .about-node {
  position: relative;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: calc(var(--about-line-x) + 0.5px - var(--about-node-pad) - var(--about-dot) / 2);
  top: 8px;
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px var(--green-soft);
}

.page-about .about-node-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 14px;
}

.page-about .about-node-idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-node-years {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--mute);
}

.page-about .about-node-title {
  margin: 0 0 16px;
  font-size: clamp(21px, 2.4vw, 30px);
  font-weight: 700;
  line-height: 1.36;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-node-body > p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 可展开细节 ---------- */

.page-about .about-more {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-more summary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  list-style: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--green);
}

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

.page-about .about-more summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
}

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

.page-about .about-more summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 4px;
  border-radius: 4px;
}

.page-about .about-more-body {
  margin-top: 16px;
  display: grid;
  gap: 12px;
}

.page-about .about-more-body p {
  margin: 0;
  max-width: 60ch;
  padding-left: 20px;
  border-left: 2px solid var(--ridge);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 引用区 ---------- */

.page-about .about-quote {
  position: relative;
  margin: clamp(56px, 9vw, 130px) 0;
  padding: clamp(30px, 5vw, 60px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 30ch;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 40px);
  font-weight: 900;
  line-height: 1.44;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-quote::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: clamp(70px, 14vw, 180px);
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--green));
  transform: translateY(-50%) rotate(-22deg);
  transform-origin: right center;
  pointer-events: none;
}

@media (max-width: 899px) {
  .page-about .about-quote::after {
    display: none;
  }
}

/* ---------- 图片 ---------- */

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), 0 100%);
  background: var(--bg-panel);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  max-width: 48ch;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--mute);
}

.page-about .about-node-body .about-figure {
  margin-top: clamp(22px, 3vw, 34px);
  max-width: 640px;
}

/* ---------- 团队 ---------- */

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

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 64px);
  align-items: start;
}

@media (min-width: 1000px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .about-team-main .display {
  margin: 10px 0 18px;
}

.page-about .about-team-list {
  list-style: none;
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-team-list li {
  display: grid;
  grid-template-columns: minmax(2.6em, auto) minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 28px);
  align-items: start;
  padding: clamp(16px, 2.2vw, 24px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.2vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--green);
}

.page-about .about-team-list h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-team-list p {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mute);
}

.page-about .about-team-note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding-left: 20px;
  border-left: 2px solid var(--gold);
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

.page-about .about-team-figure {
  align-self: stretch;
}

.page-about .about-team-figure img {
  height: clamp(260px, 30vw, 460px);
  object-fit: cover;
}

/* ---------- 接下来 ---------- */

.page-about .about-next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 28px);
}

@media (min-width: 880px) {
  .page-about .about-next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-next-list li {
  padding: clamp(22px, 3vw, 34px);
  background: var(--bg-panel);
  clip-path: polygon(
    var(--about-card-cut) 0,
    100% 0,
    100% calc(100% - var(--about-card-cut)),
    calc(100% - var(--about-card-cut)) 100%,
    0 100%,
    0 var(--about-card-cut)
  );
}

.page-about .about-next-idx {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-next-list h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--ink);
}

.page-about .about-next-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 结尾 ---------- */

.page-about .about-outro-card {
  position: relative;
  padding: clamp(28px, 5vw, 62px);
  background: linear-gradient(150deg, var(--bg-panel) 0%, var(--bg-night) 100%);
  overflow: hidden;
}

.page-about .about-outro-card .display {
  margin: 10px 0 18px;
}

.page-about .about-outro-card::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -140%;
  width: 46%;
  height: 300%;
  background: linear-gradient(105deg, transparent, rgba(53, 242, 160, 0.09));
  transform: rotate(16deg);
  pointer-events: none;
}

.page-about .about-outro-links {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 动效收敛 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump a {
    transition: none;
  }
}

@media (max-width: 560px) {
  .page-about .about-aside-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-about .about-team-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .page-about .about-team-num {
    font-size: 28px;
  }
}