.page-about {
  --about-ink-soft: #3A4550;
  --about-paper-edge: 0 20px 44px -28px rgba(42, 30, 66, .95);
  counter-reset: about-sec;
  padding-block: clamp(1.2rem, 3vw, 2.2rem) clamp(3rem, 7vw, 6rem);
  color: var(--paper);
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about p {
  margin: 0;
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--step-label);
  letter-spacing: .06em;
  color: var(--haze);
  margin-bottom: clamp(.9rem, 2vw, 1.6rem);
}

.page-about .breadcrumb a {
  color: var(--haze);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb .sep {
  margin-inline: .5rem;
  opacity: .5;
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.6rem);
  padding-block: clamp(1rem, 2.5vw, 2rem) clamp(2rem, 4vw, 3.6rem);
  border-bottom: var(--line);
}

.page-about .cover-copy .eyebrow {
  margin-bottom: .85rem;
}

.page-about .cover-copy h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.35rem, 5.4vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -.022em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .cover-copy h1 em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .cover-copy .lede {
  margin-top: 1.15rem;
  max-width: 46ch;
  font-size: var(--step-body);
  line-height: 1.85;
  color: var(--paper);
  opacity: .84;
}

.page-about .cover-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.1rem, 3vw, 2.8rem);
  margin: 1.7rem 0 0;
  padding-top: 1.3rem;
  border-top: var(--line);
}

.page-about .cover-stats > div {
  min-width: 0;
}

.page-about .cover-stats dt {
  font-family: var(--font-mono);
  font-size: var(--step-label);
  letter-spacing: .14em;
  color: var(--haze);
}

.page-about .cover-stats dd {
  margin: .38rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 3.6vw, 2.8rem);
  line-height: 1;
  color: var(--paper);
}

.page-about .cover-stats dd small {
  display: inline-block;
  margin-left: .3rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 400;
  letter-spacing: .04em;
  color: var(--haze);
}

.page-about .cover-figure {
  position: relative;
  margin: 0;
}

.page-about .cover-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid rgba(157, 180, 196, .2);
  background: var(--cabin);
}

.page-about .cover-figure::before {
  content: "";
  position: absolute;
  top: 12px;
  right: 12px;
  width: 46px;
  height: 46px;
  border-top: 2px solid var(--cyan);
  border-right: 2px solid var(--cyan);
  pointer-events: none;
}

.page-about .cover-figure figcaption,
.page-about .track-figure figcaption,
.page-about .org-figure figcaption {
  margin-top: .7rem;
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--haze);
}

@media (min-width: 880px) {
  .page-about .about-cover {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: end;
    gap: clamp(2rem, 4vw, 4rem);
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  counter-increment: about-sec;
  padding-block: clamp(2.2rem, 4.5vw, 4rem);
  border-bottom: var(--line);
}

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

.page-about .sec-head {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  column-gap: clamp(.8rem, 2vw, 1.4rem);
  row-gap: .35rem;
  align-items: start;
  margin-bottom: clamp(1.4rem, 3vw, 2.2rem);
}

.page-about .sec-head::before {
  content: counter(about-sec, decimal-leading-zero);
  grid-column: 1;
  grid-row: 1;
  padding-top: .6em;
  font-family: var(--font-mono);
  font-size: var(--step-label);
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .sec-head > * {
  grid-column: 2;
}

.page-about .sec-head .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.2vw, 2.9rem);
  line-height: 1.08;
  letter-spacing: -.018em;
  color: var(--paper);
}

.page-about .sec-head .sec-sub {
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--haze);
}

/* ---------- 赛季轨迹 ---------- */
.page-about .track-wrap {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}

.page-about .track-line {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
  display: grid;
  gap: .3rem;
}

.page-about .track-line::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(78, 240, 208, .72), rgba(78, 240, 208, .06));
}

.page-about .track-item {
  position: relative;
  padding: .75rem .9rem;
  border: 1px solid transparent;
  border-radius: 2px;
  outline: none;
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .track-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 1.1rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--night);
  border: 1px solid var(--lake);
  transition: background-color .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .track-item:hover,
.page-about .track-item:focus-visible {
  background: rgba(14, 48, 72, .62);
  border-color: rgba(78, 240, 208, .22);
}

.page-about .track-item:hover::before,
.page-about .track-item:focus-visible::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(78, 240, 208, .16);
}

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

.page-about .track-ver {
  display: inline-block;
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--sand);
  border: 1px solid rgba(216, 180, 106, .4);
  padding: .12rem .45rem;
  border-radius: 2px;
}

.page-about .track-item h3 {
  margin: .55rem 0 .3rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .track-item p {
  font-size: .9rem;
  line-height: 1.78;
  color: var(--haze);
}

.page-about .track-figure {
  margin: 0;
  padding: 10px;
  border: 1px solid rgba(157, 180, 196, .18);
  background: rgba(14, 48, 72, .4);
}

.page-about .track-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

@media (min-width: 900px) {
  .page-about .track-wrap {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: start;
  }
}

/* ---------- 团队分工 ---------- */
.page-about .team-filter {
  margin-top: .4rem;
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: clamp(1rem, 2vw, 1.4rem);
}

.page-about .filter-btn {
  min-height: 44px;
  padding: .55rem .9rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--haze);
  background: transparent;
  border: 1px solid rgba(157, 180, 196, .28);
  border-radius: 2px;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .filter-btn:hover {
  color: var(--paper);
  border-color: var(--lake);
}

.page-about .filter-btn[aria-pressed="true"] {
  color: var(--night);
  background: var(--cyan);
  border-color: var(--cyan);
}

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

.page-about .org-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: rgba(157, 180, 196, .16);
  border: 1px solid rgba(157, 180, 196, .16);
}

.page-about .org-unit {
  flex: 1 1 215px;
  min-width: 0;
  padding: clamp(1rem, 2vw, 1.5rem);
  background: var(--night);
}

.page-about .org-num {
  display: block;
  font-size: clamp(2rem, 4vw, 2.9rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .org-unit h3 {
  margin: .55rem 0 .45rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .org-unit p {
  font-size: .88rem;
  line-height: 1.78;
  color: var(--haze);
}

.page-about .org-tasks {
  list-style: none;
  margin: .85rem 0 0;
  padding: .85rem 0 0;
  border-top: 1px solid rgba(157, 180, 196, .16);
  display: grid;
  gap: .32rem;
}

.page-about .org-tasks li {
  position: relative;
  padding-left: .95rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .03em;
  color: var(--paper);
  opacity: .78;
}

.page-about .org-tasks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 5px;
  height: 1px;
  background: var(--sand);
}

.page-about .org-figure {
  margin: clamp(1.2rem, 2.5vw, 2rem) 0 0;
}

.page-about .org-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid rgba(157, 180, 196, .18);
}

/* ---------- 工作方法 ---------- */
.page-about .method-wrap {
  display: grid;
  gap: clamp(1.2rem, 2.6vw, 2rem);
}

.page-about .method-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(157, 180, 196, .16);
  border-top: 2px solid var(--cyan);
}

.page-about .method-steps li {
  background: var(--night);
  padding: clamp(1rem, 2vw, 1.4rem);
}

.page-about .method-key {
  display: block;
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--sand);
}

.page-about .method-steps h3 {
  margin: .7rem 0 .4rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .method-steps p {
  font-size: .88rem;
  line-height: 1.78;
  color: var(--haze);
}

.page-about .paper-panel {
  background: var(--paper);
  color: var(--ink);
  border-radius: 2px;
  box-shadow: var(--about-paper-edge);
  padding: clamp(1.1rem, 2.2vw, 1.6rem);
}

.page-about .method-note {
  display: grid;
  gap: .7rem;
  align-content: start;
}

.page-about .method-note p {
  font-size: .86rem;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .method-note p.mono {
  font-size: .68rem;
  letter-spacing: .14em;
  color: var(--lake);
}

@media (min-width: 700px) {
  .page-about .method-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .method-wrap {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }
}

/* ---------- 合作网络 ---------- */
.page-about .net-grid {
  display: grid;
  gap: clamp(1.1rem, 2.4vw, 2rem);
}

.page-about .net-item {
  position: relative;
  padding-top: .95rem;
  border-top: 1px solid rgba(157, 180, 196, .2);
}

.page-about .net-item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--cyan);
}

.page-about .net-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 6vw, 3.8rem);
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .net-label {
  display: block;
  margin: .45rem 0 .75rem;
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--haze);
}

.page-about .net-item p {
  font-size: .9rem;
  line-height: 1.78;
  color: var(--haze);
}

@media (min-width: 720px) {
  .page-about .net-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 记录 ---------- */
.page-about .record-grid {
  display: grid;
  gap: 1px;
  background: rgba(42, 30, 66, .6);
  border: 1px solid rgba(42, 30, 66, .6);
}

.page-about .record {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(1.1rem, 2.4vw, 1.9rem);
}

.page-about .record p {
  font-size: .88rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .record p.record-key {
  font-family: var(--font-mono);
  font-size: .68rem;
  line-height: 1.4;
  letter-spacing: .14em;
  color: var(--lake);
}

.page-about .record h3 {
  margin: .6rem 0 .5rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  letter-spacing: -.01em;
  color: var(--ink);
}

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

/* ---------- 联系 ---------- */
.page-about .about-contact {
  padding-block: clamp(2rem, 4vw, 3.4rem) clamp(1rem, 2vw, 1.5rem);
}

.page-about .contact-block {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.6rem);
  padding: clamp(1.3rem, 3.5vw, 2.8rem);
  border: 1px solid rgba(78, 240, 208, .22);
  border-radius: 2px;
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(78, 240, 208, .1), transparent 55%),
    linear-gradient(135deg, rgba(75, 58, 107, .55), rgba(14, 48, 72, .95));
}

.page-about .contact-copy .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -.018em;
  color: var(--paper);
}

.page-about .contact-copy p {
  margin-top: .95rem;
  max-width: 52ch;
  font-size: .93rem;
  line-height: 1.82;
  color: rgba(245, 241, 232, .8);
}

.page-about .contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.35rem;
}

.page-about .contact-mini {
  display: grid;
  gap: .9rem;
  margin: 0;
  padding: clamp(1rem, 2vw, 1.3rem) 0 0;
  border-top: 1px solid rgba(157, 180, 196, .22);
  align-content: start;
}

.page-about .contact-mini > div {
  display: grid;
  gap: .18rem;
}

.page-about .contact-mini dt {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--haze);
}

.page-about .contact-mini dd {
  margin: 0;
  font-size: .88rem;
  line-height: 1.62;
  color: var(--paper);
  word-break: break-word;
}

@media (min-width: 900px) {
  .page-about .contact-block {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
  }

  .page-about .contact-mini {
    border-top: 0;
    border-left: 1px solid rgba(157, 180, 196, .22);
    padding: 0 0 0 clamp(1rem, 2vw, 1.6rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .track-item,
  .page-about .track-item::before,
  .page-about .filter-btn,
  .page-about .breadcrumb a {
    transition: none;
  }
}