.page-about {
  --about-max: 1280px;
  --about-side: 284px;
  position: relative;
  background: var(--c-paper);
  color: var(--c-text);
}

@media (min-width: 1024px) {
  .page-about {
    padding-left: calc(var(--rail-w) + 8px);
    padding-right: calc(var(--dock-w) + 8px);
  }
}

.page-about .about-shell {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 20px 16px 64px;
}

@media (min-width: 700px) {
  .page-about .about-shell {
    padding: 28px 26px 80px;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-side) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding: 40px 26px 104px;
  }
}

/* ---------- 左侧粘性主张栏 ---------- */
.page-about .about-claim {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-block);
  padding: 28px 24px 30px;
  color: #fff;
  background:
    radial-gradient(130% 95% at 100% 0%, rgba(22, 196, 127, 0.42), transparent 56%),
    linear-gradient(158deg, var(--c-red) 0%, var(--c-red-deep) 88%);
  box-shadow: var(--shadow-1);
  margin-bottom: 40px;
}

.page-about .about-claim::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(230, 184, 74, 0.34), transparent 70%);
  pointer-events: none;
}

.page-about .about-claim::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 5px;
  height: 100%;
  background: linear-gradient(180deg, var(--c-gold), var(--c-green));
}

@media (min-width: 960px) {
  .page-about .about-claim {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
    margin-bottom: 0;
  }
}

.page-about .claim-eyebrow {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-green-soft);
  text-transform: none;
}

.page-about .claim-title {
  margin: 14px 0 0;
  font-size: clamp(30px, 8vw, 38px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  transform: skewX(-6deg);
  transform-origin: left center;
  position: relative;
  z-index: 1;
}

.page-about .claim-layers {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  position: relative;
  z-index: 1;
}

.page-about .claim-layers li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 14px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--r-pill);
  background: rgba(13, 17, 20, 0.26);
  border: 1px solid rgba(245, 248, 246, 0.16);
  transition: background var(--dur) ease, border-color var(--dur) ease;
}

.page-about .claim-layers li:hover {
  background: rgba(13, 17, 20, 0.42);
  border-color: rgba(143, 227, 192, 0.55);
}

.page-about .claim-no {
  font-family: var(--font-num);
  font-size: 14px;
  color: var(--c-gold);
  letter-spacing: 0.04em;
}

.page-about .claim-note {
  position: relative;
  z-index: 1;
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(245, 248, 246, 0.2);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 248, 246, 0.72);
}

/* ---------- 右侧叙事列 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-hero {
  margin: 14px 0 60px;
}

.page-about .hero-copy .eyebrow {
  margin: 0 0 10px;
  color: var(--c-red);
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(28px, 7vw, 50px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--c-ink);
  max-width: 20ch;
}

.page-about .hero-lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-text);
}

.page-about .hero-media {
  margin: 32px 0 0;
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: inherit;
}

.page-about .media-caption {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(27, 34, 38, 0.62);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  margin: 0 0 64px;
}

@media (min-width: 960px) {
  .page-about .chapter {
    margin-bottom: 92px;
  }
}

.page-about .chapter-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.page-about .chapter-index {
  flex: none;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(38px, 9vw, 58px);
  line-height: 0.94;
  letter-spacing: -0.05em;
  color: var(--c-red);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-about .chapter-index {
    background: linear-gradient(160deg, var(--c-gold) 0%, var(--c-red) 76%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.page-about .chapter-heading {
  padding-top: 4px;
  min-width: 0;
}

.page-about .chapter-kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-green);
}

.page-about .chapter-title {
  margin: 6px 0 0;
  font-size: clamp(21px, 4.6vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .chapter-body > p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  max-width: 62ch;
}

@media (min-width: 700px) {
  .page-about .chapter-body > p {
    font-size: 17px;
  }
}

/* ---------- 01 三层做法 ---------- */
.page-about .claim-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .claim-steps li {
  position: relative;
  padding: 20px 22px 20px 24px;
  border-radius: var(--r-card);
  background: #fff;
  border: 1px solid rgba(27, 34, 38, 0.09);
  box-shadow: 0 10px 26px rgba(13, 17, 20, 0.05);
  overflow: hidden;
}

.page-about .claim-steps li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--c-green), var(--c-gold));
}

.page-about .step-name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--c-ink);
}

.page-about .step-no {
  font-family: var(--font-num);
  font-size: 22px;
  color: var(--c-red);
  letter-spacing: -0.02em;
}

.page-about .claim-steps li > p:last-child {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-text);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 28px;
}

.page-about .track-stage {
  position: relative;
  padding-left: 36px;
}

.page-about .track-dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--c-green);
  box-shadow: 0 0 0 6px rgba(22, 196, 127, 0.16);
}

.page-about .track-stage:nth-child(2) .track-dot {
  background: var(--c-gold);
  box-shadow: 0 0 0 6px rgba(230, 184, 74, 0.18);
}

.page-about .track-stage:nth-child(3) .track-dot {
  background: var(--c-red);
  box-shadow: 0 0 0 6px rgba(176, 18, 43, 0.16);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--c-green), var(--c-gold) 50%, var(--c-red));
}

.page-about .track-era {
  margin: 0;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--c-red);
}

.page-about .track-title {
  margin: 6px 0 8px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .track-stage p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text);
}

@media (min-width: 780px) {
  .page-about .about-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
    margin-top: 40px;
  }

  .page-about .about-track::before {
    left: 6px;
    right: 6px;
    top: 8px;
    bottom: auto;
    width: auto;
    height: 3px;
    background: linear-gradient(90deg, var(--c-green), var(--c-gold) 50%, var(--c-red));
  }

  .page-about .track-stage {
    padding: 38px 0 0;
  }

  .page-about .track-dot {
    top: 0;
    left: 0;
  }
}

.page-about .track-media {
  margin-top: 34px;
}

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  margin: 28px 0 0;
  display: grid;
  gap: 14px;
}

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

.page-about .team-card {
  padding: 22px 20px;
  border-radius: var(--r-card);
  background: #fff;
  border: 1px solid rgba(27, 34, 38, 0.09);
  transition: transform var(--dur) ease, border-color var(--dur) ease, box-shadow var(--dur) ease;
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  border-color: rgba(22, 196, 127, 0.5);
  box-shadow: 0 14px 30px rgba(13, 17, 20, 0.08);
}

.page-about .team-tag {
  display: inline-block;
  margin: 0;
  padding: 3px 12px;
  border-radius: var(--r-pill);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-red-deep);
  background: rgba(230, 184, 74, 0.24);
}

.page-about .team-name {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--c-ink);
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-text);
}

.page-about .team-media {
  margin-top: 28px;
  max-width: 640px;
}

/* ---------- 04 覆盖 ---------- */
.page-about .about-stats {
  margin: 30px 0 26px;
  display: grid;
  gap: 14px;
}

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  padding: 20px 18px;
  border-radius: var(--r-card);
  border-left: 4px solid var(--c-green);
  background: linear-gradient(120deg, rgba(22, 196, 127, 0.1), rgba(245, 248, 246, 0) 72%);
}

.page-about .about-stat:nth-child(2) {
  border-left-color: var(--c-gold);
  background: linear-gradient(120deg, rgba(230, 184, 74, 0.14), rgba(245, 248, 246, 0) 72%);
}

.page-about .about-stat:nth-child(3) {
  border-left-color: var(--c-red);
  background: linear-gradient(120deg, rgba(176, 18, 43, 0.1), rgba(245, 248, 246, 0) 72%);
}

.page-about .about-stat-value {
  margin: 0;
  font-family: var(--font-num);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-about .about-stat-label {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(27, 34, 38, 0.68);
}

.page-about .reach-note {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-text);
  padding: 18px 20px;
  border-radius: var(--r-card);
  background: rgba(42, 50, 56, 0.06);
}

/* ---------- 05 三条准则 ---------- */
.page-about .rules-grid {
  margin: 28px 0 0;
  display: grid;
  gap: 16px;
}

@media (min-width: 780px) {
  .page-about .rules-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .rule-card {
  position: relative;
  padding: 26px 22px;
  border-radius: var(--r-block);
  background: #fff;
  border: 1.5px solid rgba(27, 34, 38, 0.12);
  transition: border-color var(--dur) ease, transform var(--dur) ease, box-shadow var(--dur) ease;
}

.page-about .rule-card::after {
  content: "";
  position: absolute;
  inset: -1.5px;
  border-radius: inherit;
  padding: 1.5px;
  background: linear-gradient(140deg, var(--c-green), var(--c-gold) 52%, var(--c-red));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur) ease;
  pointer-events: none;
}

.page-about .rule-card:hover,
.page-about .rule-card:focus-visible {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: 0 18px 36px rgba(13, 17, 20, 0.1);
  outline: none;
}

.page-about .rule-card:hover::after,
.page-about .rule-card:focus-visible::after {
  opacity: 1;
}

.page-about .rule-no {
  margin: 0;
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-gold);
}

.page-about .rule-name {
  margin: 8px 0 10px;
  font-size: 19px;
  font-weight: 800;
  color: var(--c-ink);
}

.page-about .rule-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text);
}

.page-about .rule-detail {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(27, 34, 38, 0.16);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(27, 34, 38, 0.66);
  transition: color var(--dur) ease;
}

.page-about .rule-card:hover .rule-detail,
.page-about .rule-card:focus-visible .rule-detail {
  color: var(--c-text);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-block);
  padding: 34px 24px 30px;
  color: var(--c-paper);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(22, 196, 127, 0.24), transparent 58%),
    linear-gradient(150deg, var(--c-ink) 0%, #1b2429 100%);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-red), var(--c-gold), var(--c-green));
}

@media (min-width: 700px) {
  .page-about .about-cta {
    padding: 44px 40px 40px;
  }
}

.page-about .cta-kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--c-green-soft);
}

.page-about .cta-title {
  margin: 10px 0 0;
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .cta-text {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(245, 248, 246, 0.72);
}

.page-about .cta-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .cta-actions .btn {
  flex: 0 1 auto;
}

.page-about .about-cta .btn-ghost {
  color: var(--c-paper);
  border-color: var(--line-strong);
}

.page-about .about-cta .btn-ghost:hover {
  border-color: var(--c-green);
  color: var(--c-green-soft);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .claim-layers li,
  .page-about .team-card,
  .page-about .rule-card,
  .page-about .rule-card::after,
  .page-about .rule-detail {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .rule-card:hover,
  .page-about .rule-card:focus-visible {
    transform: none;
  }
}