.page-about {
  --about-cut: 18px;
  --about-hair: rgba(201, 162, 39, 0.3);
  --about-block: clamp(3.25rem, 7vw, 6rem);
  display: block;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(6rem, 12vw, 8.5rem) clamp(1.125rem, 4vw, 3rem) clamp(3rem, 6vw, 5rem);
  color: var(--c-mute);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  overflow-x: clip;
}

@media (min-width: 1080px) {
  .page-about {
    padding-left: clamp(5rem, 9vw, 10rem);
    padding-right: clamp(2rem, 4vw, 3.5rem);
  }
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-mute);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--about-hair);
}

.page-about .breadcrumb a {
  color: var(--c-ice);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--c-ice);
}

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--c-gold-lite);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(2rem, 5vw, 3.25rem);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(72px, 14vw, 168px);
  height: 2px;
  background: linear-gradient(90deg, var(--c-gold), rgba(201, 162, 39, 0));
}

.page-about .about-hero h1 {
  margin: 0.4rem 0 1.15rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 6.4vw, 4.65rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--c-cream);
}

.page-about .about-hero .lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.13rem);
  line-height: 1.78;
  color: var(--c-mute);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.15rem 1.25rem;
  margin: 2.25rem 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .hero-facts div {
  display: flex;
  flex-direction: column;
  gap: 0.22rem;
}

.page-about .hero-facts dt {
  order: 2;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-mute);
}

.page-about .hero-facts dd {
  order: 1;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 3.4vw, 2.15rem);
  line-height: 1.05;
  color: var(--c-gold-lite);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.1rem;
}

/* ---------- 通用区块 ---------- */
.page-about .sec {
  margin-top: var(--about-block);
}

.page-about .sec-head {
  max-width: 66ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .sec-head h2,
.page-about .closing h2 {
  margin: 0.35rem 0 0.85rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.6vw, 2.35rem);
  line-height: 1.2;
  color: var(--c-cream);
}

.page-about .sec-lede {
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--c-mute);
}

/* ---------- 01 运营主体 ---------- */
.page-about .claim-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

@media (min-width: 980px) {
  .page-about .claim-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  }
}

.page-about .claim-text h2 {
  margin: 0.35rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.6vw, 2.35rem);
  line-height: 1.2;
  color: var(--c-cream);
}

.page-about .claim-text p {
  margin: 0 0 1rem;
  max-width: 62ch;
}

.page-about .tick-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.page-about .tick-list li {
  position: relative;
  padding-left: 1.6rem;
  line-height: 1.7;
}

.page-about .tick-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 14px;
  height: 2px;
  background: var(--c-gold);
}

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

/* ---------- 02 时间轴 ---------- */
.page-about .timeline-bg {
  margin: 0 0 clamp(2rem, 4.5vw, 3rem);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 162, 39, 0) 0%, var(--c-gold) 16%, var(--c-gold) 84%, rgba(201, 162, 39, 0) 100%);
  opacity: 0.55;
}

.page-about .tl-item {
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: 1.6rem;
}

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

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 1.75rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-ice);
  box-shadow: 0 0 0 4px rgba(126, 200, 227, 0.14);
  transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-card {
  position: relative;
  padding: 1.35rem 1.4rem 1.4rem;
  background: linear-gradient(155deg, rgba(26, 14, 42, 0.94), rgba(14, 14, 18, 0.9));
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--about-hair);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-card,
.page-about .tl-item:focus-within .tl-card {
  border-left-color: var(--c-gold);
  border-color: var(--about-hair);
  transform: translateX(5px);
  background: linear-gradient(155deg, rgba(58, 26, 94, 0.62), rgba(14, 14, 18, 0.92));
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-within .tl-dot {
  background: var(--c-gold-lite);
  box-shadow: 0 0 0 5px rgba(201, 162, 39, 0.16);
}

.page-about .tl-year {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--c-gold);
}

.page-about .tl-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.22rem;
  color: var(--c-cream);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.72;
}

@media (min-width: 860px) {
  .page-about .tl-item {
    max-width: 62%;
  }
  .page-about .tl-item:nth-child(1) { margin-left: 0; }
  .page-about .tl-item:nth-child(2) { margin-left: 6%; }
  .page-about .tl-item:nth-child(3) { margin-left: 12%; }
  .page-about .tl-item:nth-child(4) { margin-left: 18%; }
}

/* ---------- 03 形态卡片 ---------- */
.page-about .shape-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.35rem;
}

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

.page-about .shape-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.9rem 1.5rem 1.6rem;
  background: linear-gradient(162deg, rgba(91, 42, 134, 0.24), rgba(14, 14, 18, 0.92) 62%);
  border: 1px solid var(--line-soft);
  clip-path: polygon(
    var(--about-cut) 0,
    100% 0,
    100% calc(100% - var(--about-cut)),
    calc(100% - var(--about-cut)) 100%,
    0 100%,
    0 var(--about-cut)
  );
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .shape-card:hover,
.page-about .shape-card:focus-within {
  border-color: var(--c-gold);
  transform: translateY(-5px);
}

.page-about .seal {
  align-self: flex-start;
  margin-bottom: 1.05rem;
  padding: 0.3rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-gold-lite);
  background: var(--c-wine);
  border: 1px solid rgba(233, 206, 107, 0.35);
}

.page-about .shape-card h3 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--c-cream);
}

.page-about .shape-desc {
  margin: 0 0 1.15rem;
  font-size: 0.94rem;
  line-height: 1.74;
}

.page-about .shape-spec {
  margin: 0 0 1.15rem;
  padding: 0.85rem 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 0.5rem;
}

.page-about .shape-spec div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.82rem;
}

.page-about .shape-spec dt {
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--c-mute);
}

.page-about .shape-spec dd {
  margin: 0;
  color: var(--c-cream);
  text-align: right;
}

.page-about .shape-when {
  margin: 0 0 1.25rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--c-ice);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--c-ice);
}

.page-about .shape-link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-gold);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  padding-bottom: 0.15rem;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .shape-link:hover,
.page-about .shape-link:focus-visible {
  color: var(--c-gold-lite);
  border-bottom-color: var(--c-gold-lite);
}

/* ---------- 04 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
  align-items: start;
}

@media (min-width: 980px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }
}

.page-about .team-board {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .team-slot {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 1.1rem;
  row-gap: 0.35rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-idx {
  grid-row: span 2;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  color: var(--c-wine);
  background: rgba(122, 46, 59, 0.22);
  border: 1px solid rgba(122, 46, 59, 0.6);
  width: 2.15rem;
  height: 2.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .team-slot h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--c-cream);
}

.page-about .team-slot p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.74;
}

.page-about .team-media {
  margin: 0;
}

/* ---------- 05 备案与规模 ---------- */
.page-about .trust-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.35rem;
}

@media (min-width: 900px) {
  .page-about .trust-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
  }
}

.page-about .trust-panel {
  padding: 1.5rem 1.4rem;
  background: rgba(26, 14, 42, 0.55);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--about-hair);
}

.page-about .trust-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
}

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

.page-about .trust-list div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.72rem 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .trust-list dt {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--c-mute);
  white-space: nowrap;
}

.page-about .trust-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--c-gold-lite);
  text-align: right;
  word-break: break-word;
}

.page-about .trust-contact {
  padding: 1.5rem 1.4rem;
  background: linear-gradient(165deg, rgba(91, 42, 134, 0.3), rgba(14, 14, 18, 0.9));
  border: 1px solid var(--about-hair);
  clip-path: polygon(
    var(--about-cut) 0,
    100% 0,
    100% calc(100% - var(--about-cut)),
    calc(100% - var(--about-cut)) 100%,
    0 100%,
    0 var(--about-cut)
  );
}

.page-about .trust-contact h3 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--c-cream);
}

.page-about .trust-contact > p {
  margin: 0 0 1.15rem;
  font-size: 0.92rem;
  line-height: 1.72;
}

.page-about .contact-list {
  margin: 0 0 1.35rem;
  display: grid;
  gap: 0.65rem;
}

.page-about .contact-list div {
  display: grid;
  gap: 0.15rem;
}

.page-about .contact-list dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mute);
}

.page-about .contact-list dd {
  margin: 0;
  font-size: 0.9rem;
  color: var(--c-cream);
  word-break: break-word;
}

/* ---------- 06 回顾 ---------- */
.page-about .review-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

@media (min-width: 840px) {
  .page-about .review-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .review-card {
  position: relative;
  padding: 1.5rem 1.35rem 1.55rem;
  background: rgba(14, 14, 18, 0.72);
  border: 1px solid var(--line-soft);
  transition: border-color var(--dur) var(--ease);
}

.page-about .review-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 2px;
  background: var(--c-gold);
}

.page-about .review-card:hover {
  border-color: var(--about-hair);
}

.page-about .review-tag {
  margin: 0.35rem 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-about .review-card h3 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.16rem;
  line-height: 1.34;
  color: var(--c-cream);
}

.page-about .review-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.74;
}

/* ---------- 收束 ---------- */
.page-about .closing {
  margin-top: var(--about-block);
  padding: clamp(2rem, 5vw, 3.25rem) clamp(1.4rem, 4vw, 2.75rem);
  background: linear-gradient(150deg, rgba(58, 26, 94, 0.55), rgba(14, 14, 18, 0.94) 68%);
  border: 1px solid var(--about-hair);
  border-top: 2px solid var(--c-gold);
  text-align: left;
}

.page-about .closing p {
  max-width: 62ch;
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.78;
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.65rem;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .shape-card,
  .page-about .tl-card,
  .page-about .tl-dot,
  .page-about .shape-link,
  .page-about .review-card,
  .page-about .breadcrumb a {
    transition: none;
  }
  .page-about .shape-card:hover,
  .page-about .shape-card:focus-within,
  .page-about .tl-item:hover .tl-card,
  .page-about .tl-item:focus-within .tl-card {
    transform: none;
  }
}