.page-about {
  --about-radius: 16px;
  --about-rail: 172px;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(44px, 6vw, 92px) clamp(34px, 5vw, 68px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(36, 52, 79, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 52, 79, 0.6) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(120% 90% at 12% 8%, #000 0%, rgba(0, 0, 0, 0.35) 52%, transparent 88%);
  mask-image: radial-gradient(120% 90% at 12% 8%, #000 0%, rgba(0, 0, 0, 0.35) 52%, transparent 88%);
}

.page-about .about-hero .container {
  position: relative;
}

.page-about .kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin: 0;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(38px, 5.6vw, 84px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 17ch;
}

.page-about .about-hero__title strong {
  font-weight: 900;
  color: var(--red-bright);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(247, 246, 243, 0.8);
}

/* 首屏数字带 */
.page-about .about-stats {
  margin: clamp(30px, 4.5vw, 54px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink-2);
  padding: 18px 16px 20px;
}

.page-about .about-stat dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.07em;
  color: var(--muted);
  line-height: 1.5;
}

.page-about .about-stat dd {
  margin: 12px 0 0;
  line-height: 1.1;
}

.page-about .stat-num {
  display: inline-block;
  font-size: clamp(32px, 4vw, 46px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--gold);
}

.page-about .stat-unit {
  display: inline-block;
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 双轨布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-block: clamp(40px, 6vw, 88px);
}

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

.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 6vw, 92px);
  min-width: 0;
}

.page-about .about-flow .section {
  padding-block: 0;
  min-width: 0;
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 40px;
    border-left: 1px solid var(--line);
    padding-left: 18px;
  }
}

.page-about .about-rail .toc__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0;
}

.page-about .about-toc {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc .toc-link {
  position: relative;
  display: block;
  padding: 9px 0 9px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s ease;
}

.page-about .about-toc .toc-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--gold);
  transform: translateY(-50%);
  transition: height 0.18s ease;
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link:focus-visible,
.page-about .about-toc .toc-link.is-active {
  color: var(--gold);
}

.page-about .about-toc .toc-link:hover::before,
.page-about .about-toc .toc-link:focus-visible::before,
.page-about .about-toc .toc-link.is-active::before {
  height: 100%;
}

/* ---------- 通用章节排版 ---------- */
.page-about .about-block {
  position: relative;
}

.page-about .section-head {
  max-width: 46ch;
}

.page-about .section-title {
  margin: 10px 0 0;
  font-size: clamp(26px, 3.4vw, 48px);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .section-title strong {
  font-weight: 900;
}

.page-about .about-block > p {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(247, 246, 243, 0.8);
}

.page-about .about-block a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-block a:hover {
  color: var(--red-bright);
}

/* ---------- 图版 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 3.5vw, 40px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--muted);
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}

/* ---------- 团队构成 ---------- */
.page-about .team-split {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .team-split__bar {
  display: block;
  height: 8px;
  border-radius: 99px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .team-split__bar i {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--red-deep), var(--red-bright));
}

.page-about .team-split__item:nth-child(1) .team-split__bar i { width: 60%; }

.page-about .team-split__item:nth-child(2) .team-split__bar i {
  width: 40%;
  background: linear-gradient(90deg, var(--gold), var(--gold-soft));
}

.page-about .team-split__label {
  margin: 12px 0 0;
  font-size: 15px;
  color: rgba(247, 246, 243, 0.9);
  letter-spacing: 0.01em;
}

.page-about .team-split__label strong {
  font-size: 22px;
  font-weight: 900;
  color: var(--paper);
  margin-right: 2px;
}

.page-about .team-split__note {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 54ch;
}

@media (min-width: 760px) {
  .page-about .team-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 40px;
  }
}

/* ---------- 三个阶段 ---------- */
.page-about .phase-track {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .phase-card {
  position: relative;
  padding: 24px 20px 26px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  transition: border-color 0.18s ease;
}

.page-about .phase-card:hover {
  border-color: var(--red-bright);
}

.page-about .phase-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 20px;
  width: 44px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--red);
}

.page-about .phase-card__num {
  display: block;
  font-size: clamp(52px, 6.4vw, 92px);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: rgba(232, 179, 68, 0.24);
}

.page-about .phase-card__stage {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .phase-card h3 {
  margin: 8px 0 0;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .phase-card p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(247, 246, 243, 0.72);
}

@media (min-width: 900px) {
  .page-about .phase-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .phase-card:nth-child(2) { margin-top: 28px; }
  .page-about .phase-card:nth-child(3) { margin-top: 56px; }
}

/* ---------- 认证区块（纸白实色层） ---------- */
.page-about .about-block--paper {
  background: var(--paper);
  color: var(--black);
  border-radius: 20px;
  padding: clamp(26px, 4.2vw, 54px);
}

.page-about .about-block--paper .kicker {
  color: var(--red);
}

.page-about .about-block--paper .section-title {
  color: var(--black);
}

.page-about .about-block--paper > p {
  color: rgba(8, 9, 12, 0.72);
}

.page-about .cert-grid {
  margin: 30px 0 0;
  display: grid;
  gap: 16px;
}

.page-about .cert-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--paper-2);
  border-radius: 14px;
  padding: 22px 20px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .cert-card:hover {
  border-color: var(--gold);
  box-shadow: 0 14px 32px -20px rgba(8, 9, 12, 0.55);
}

.page-about .cert-card__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--black);
  background: var(--gold-soft);
  border-radius: 99px;
  padding: 4px 10px;
  transition: background-color 0.18s ease;
}

.page-about .cert-card:hover .cert-card__badge {
  background: var(--gold);
}

.page-about .cert-card h3 {
  margin: 14px 0 0;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--black);
}

.page-about .cert-card p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(8, 9, 12, 0.7);
}

.page-about .cert-card__note {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted) !important;
  padding-top: 10px;
  border-top: 1px dashed var(--paper-2);
}

@media (min-width: 760px) {
  .page-about .cert-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  margin: 30px 0 0;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

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

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .partner-node {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-about .partner-node:hover {
  border-color: var(--red-bright);
  transform: translateX(4px);
}

.page-about .partner-node__num {
  flex: 0 0 auto;
  min-width: 4em;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .partner-node__name {
  margin: 0;
  font-size: 16px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .partner-node__desc {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(247, 246, 243, 0.72);
}

@media (min-width: 880px) {
  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
  }

  .page-about .partner-list {
    margin-top: 6px;
  }
}

/* ---------- 湖南根基 ---------- */
.page-about .hunan-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .hunan-facts li {
  background: var(--ink-2);
  padding: 16px 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
}

.page-about .hunan-facts__k {
  flex: 0 0 auto;
  min-width: 6.5em;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .hunan-facts__v {
  font-size: 15.5px;
  color: rgba(247, 246, 243, 0.9);
}

@media (min-width: 680px) {
  .page-about .hunan-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .hunan-facts li {
    flex-direction: column;
    gap: 8px;
  }
}

/* ---------- 清单维护 ---------- */
.page-about .upkeep-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .upkeep-step {
  background: var(--ink-2);
  padding: 22px 18px 24px;
  position: relative;
  transition: background-color 0.18s ease;
}

.page-about .upkeep-step:hover {
  background: #1b2a45;
}

.page-about .upkeep-step__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .upkeep-step h3 {
  margin: 12px 0 0;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .upkeep-step p {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(247, 246, 243, 0.7);
}

.page-about .upkeep-foot {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 246, 243, 0.78);
  max-width: 62ch;
}

@media (min-width: 820px) {
  .page-about .upkeep-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  padding-block: clamp(46px, 6.5vw, 96px);
}

.page-about .about-cta__panel {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  padding: clamp(28px, 4.6vw, 58px);
  background: linear-gradient(142deg, var(--red-deep) 0%, var(--red) 58%, #bf1f19 100%);
  color: #fff;
}

.page-about .about-cta__panel::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.22);
  pointer-events: none;
}

.page-about .about-cta .kicker {
  color: var(--gold-soft);
}

.page-about .about-cta__title {
  position: relative;
  margin: 12px 0 0;
  font-size: clamp(24px, 3.3vw, 42px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  max-width: 20ch;
  color: #fff;
}

.page-about .about-cta__lead {
  position: relative;
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.86);
}

.page-about .about-cta__actions {
  position: relative;
  margin: 26px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__links {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.24);
  display: grid;
  gap: 10px;
}

.page-about .about-cta__links a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.92);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-about .about-cta__links a:hover {
  color: var(--gold-soft);
}

@media (min-width: 720px) {
  .page-about .about-cta__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 28px;
  }
}