.page-about {
  --about-rail-w: 168px;
  --about-soft-line: rgba(168, 216, 206, 0.14);
  --about-glass: rgba(168, 216, 206, 0.055);
  --about-glass-strong: rgba(168, 216, 206, 0.1);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(88px, 11vw, 148px) 0 clamp(46px, 6vw, 76px);
  background:
    radial-gradient(92% 120% at 88% -12%, rgba(63, 242, 208, 0.22), transparent 62%),
    radial-gradient(70% 90% at -12% 112%, rgba(255, 107, 53, 0.16), transparent 60%),
    linear-gradient(168deg, var(--ink-deep) 0%, var(--ink) 62%, #05241f 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  right: 0;
  width: 52%;
  height: 74%;
  background: linear-gradient(215deg, rgba(63, 242, 208, 0.11), transparent 72%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 74%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -20%;
  bottom: -58%;
  width: min(760px, 92vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  box-shadow: inset 0 0 0 44px rgba(168, 216, 206, 0.035);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(26px, 4vw, 44px);
  font-size: 0.82rem;
}

.page-about .about-hero .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

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

.page-about .about-hero .eyebrow {
  color: var(--mist);
  margin: 0 0 16px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.6vw, 4.2rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 18ch;
  color: var(--paper);
}

.page-about .about-br {
  display: none;
}

.page-about .about-lead {
  max-width: 54ch;
  margin: 0;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.9;
  color: rgba(242, 247, 244, 0.8);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 18px 24px;
  margin-top: clamp(30px, 4.5vw, 48px);
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat .stat-figure {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  line-height: 1;
  color: var(--yellow);
  letter-spacing: -0.01em;
}

.page-about .about-stat-label {
  font-family: var(--font-label);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-jump a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-label);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--ink-deep);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(48px, 7vw, 92px) 0;
  scroll-margin-top: calc(var(--nav-h) + 24px);
}

.page-about .about-sec--tint {
  background: var(--ink-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 14px;
  border-left: 1px solid var(--line-strong);
  font-family: var(--font-label);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-rail-kicker {
  color: var(--mist);
}

.page-about .about-rail-year {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: 0;
  color: var(--yellow);
}

.page-about .about-rail-note {
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.page-about .about-body {
  min-width: 0;
  max-width: 72ch;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.32;
  margin: 0 0 18px;
  color: var(--paper);
}

.page-about .about-body p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.78);
}

.page-about .about-body > :last-child {
  margin-bottom: 0;
}

.page-about .about-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 242, 208, 0.4);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

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

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure-inner {
  display: block;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--ink-deep);
}

.page-about .about-figure-inner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(148deg, rgba(63, 242, 208, 0.2), rgba(255, 107, 53, 0.12) 68%, transparent);
  mix-blend-mode: screen;
  pointer-events: none;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 大引语 ---------- */
.page-about .about-quote {
  margin: 32px 0 0;
  padding: 4px 0 4px 22px;
  border-left: 2px solid var(--orange);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 2.2vw, 1.6rem);
  line-height: 1.66;
  color: var(--paper);
}

.page-about .about-body .about-quote + p {
  margin-top: 24px;
}

/* ---------- 整理方法：折叠步骤 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-step {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--about-glass);
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-step[open] {
  border-color: var(--line-strong);
  background: var(--about-glass-strong);
}

.page-about .about-step summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-label);
  font-size: 1.02rem;
  letter-spacing: 0.04em;
  color: var(--paper);
}

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

.page-about .about-step summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: 12px;
}

.page-about .about-step-no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--orange);
}

.page-about .about-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .about-step-body {
  padding: 0 18px 18px;
}

.page-about .about-body .about-step-body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.76);
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 22px;
  margin-top: 26px;
}

.page-about .about-team {
  border-top: 2px solid var(--cyan);
  padding-top: 16px;
  min-width: 0;
}

.page-about .about-team-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--yellow);
  margin-bottom: 8px;
}

.page-about .about-team h3 {
  margin: 0 0 8px;
  font-family: var(--font-label);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .about-body .about-team p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.74);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(63, 242, 208, 0.06));
}

.page-about .about-tl-item {
  position: relative;
  padding-bottom: 30px;
  min-width: 0;
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-deep);
  box-shadow: 0 0 0 4px rgba(63, 242, 208, 0.1);
}

.page-about .about-tl-item:last-child::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(63, 242, 208, 0.16);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  color: var(--yellow);
  margin-bottom: 5px;
}

.page-about .about-tl-title {
  margin: 0 0 6px;
  font-family: var(--font-label);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-body p.about-tl-desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.74);
}

/* ---------- 规模数据 ---------- */
.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(150px, 100%), 1fr));
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--line);
}

.page-about .about-scale-item {
  background: var(--ink-deep);
  padding: 20px 18px;
  min-width: 0;
}

.page-about .about-scale-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--yellow);
}

.page-about .about-scale-num small {
  font-size: 0.55em;
  font-weight: 500;
  margin-left: 2px;
  color: var(--mist);
}

.page-about .about-scale-label {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 合作清单 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-partners li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-soft-line);
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.78);
}

.page-about .about-partners li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-partners li::before {
  content: "";
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: 0.68em;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-body .about-partners a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(63, 242, 208, 0.4);
}

/* ---------- 承诺 ---------- */
.page-about .about-promise {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-promise-item {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(158deg, rgba(63, 242, 208, 0.1), rgba(168, 216, 206, 0.03));
  min-width: 0;
}

.page-about .about-promise-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-label);
  font-size: 1.02rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-body .about-promise-item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.76);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: clamp(30px, 4.5vw, 46px);
}

.page-about .about-body p.about-cta-note {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.9;
  color: var(--muted);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-br {
    display: inline;
  }
}

@media (min-width: 760px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

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

@media (min-width: 920px) {
  .page-about .about-block {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--nav-h) + 32px);
    align-self: start;
  }

  .page-about .about-figure {
    margin-top: 36px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-block {
    grid-template-columns: 180px minmax(0, 1fr) 84px;
  }

  .page-about .about-body {
    grid-column: 2;
  }
}

@media (max-width: 599px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }

  .page-about .about-step summary {
    gap: 10px;
    font-size: 0.96rem;
  }

  .page-about .about-quote {
    padding-left: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump a,
  .page-about .about-step,
  .page-about .about-body a,
  .page-about .about-hero .breadcrumb a {
    transition-duration: 0.01ms;
  }
}