.page-about {
  background: var(--green-night);
  color: var(--cream);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 26px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumb a {
  color: var(--grey-green);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
}
.page-about .breadcrumb li[aria-current="page"] {
  color: var(--cream);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .hero {
  padding: 34px 0 62px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .hero-grid {
  display: grid;
  gap: 40px;
}
.page-about .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0;
}
.page-about .hero h1 {
  margin: 16px 0 0;
  font-family: var(--serif);
  font-size: clamp(31px, 7vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--white);
}
.page-about .lede {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(243, 235, 221, 0.8);
}
.page-about .hero-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--lime);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--lime);
}
.page-about .hero-visual {
  position: relative;
  margin-bottom: 22px;
}
.page-about .hero-stamp {
  position: absolute;
  left: 12px;
  bottom: -20px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  padding: 10px 16px;
  background: var(--green-stand);
  border: 1px solid var(--line-lime);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.5);
}
.page-about .hero-stamp-num {
  font-family: var(--display);
  font-size: clamp(28px, 6vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}
.page-about .hero-stamp-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--grey-green);
}

/* ---------- 目录 ---------- */
.page-about .toc {
  padding: 24px 0 26px;
  background: rgba(7, 19, 14, 0.68);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .toc-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 20px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .toc-list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 0;
  border-bottom: 1px solid transparent;
  font-size: 14px;
  color: var(--cream);
  text-decoration: none;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}
.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--line-lime);
}
.page-about .toc-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: 62px 0;
}
.page-about .chapter--dark {
  background: var(--green-night);
}
.page-about .chapter--turf {
  background:
    radial-gradient(circle at 84% 14%, rgba(200, 255, 61, 0.07), transparent 58%),
    linear-gradient(180deg, var(--green-night) 0%, var(--green-turf) 52%, var(--green-stand) 100%);
  border-top: 1px solid var(--line-lime);
  border-bottom: 1px solid var(--line-lime);
}
.page-about .chapter--sheet {
  background: var(--cream);
  color: var(--ink);
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
}
.page-about .chapter-grid {
  display: grid;
  gap: 28px;
}
.page-about .chapter-head {
  min-width: 0;
}
.page-about .section-title {
  margin: 14px 0 0;
  font-family: var(--serif);
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.005em;
  color: var(--white);
}
.page-about .chapter-body p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.92;
  color: rgba(243, 235, 221, 0.82);
}
.page-about .chapter-body p:last-child {
  margin-bottom: 0;
}
.page-about .sheet-lede {
  margin: 14px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(26, 20, 16, 0.72);
}
.page-about .chapter--sheet .section-title {
  color: var(--ink);
}
.page-about .chapter--sheet .eyebrow {
  color: var(--gold);
}

/* ---------- 旁注 ---------- */
.page-about .sidenote {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--gold);
  border-top: 1px solid var(--line-soft);
  background: rgba(18, 53, 42, 0.6);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.9;
  color: rgba(243, 235, 221, 0.76);
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  margin: 0;
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--green-turf), var(--green-stand));
  border: 1px solid var(--line-soft);
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .media-frame--wide img {
  aspect-ratio: 16 / 9;
}
.page-about .media-frame--tall img {
  aspect-ratio: 3 / 4;
}
.page-about .media-frame__cap {
  padding: 10px 13px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--grey-green);
  border-top: 1px solid var(--line-soft);
}
.page-about .chapter--sheet .media-frame {
  border-color: rgba(26, 20, 16, 0.14);
}
.page-about .chapter--sheet .media-frame__cap {
  color: rgba(26, 20, 16, 0.6);
  border-top-color: rgba(26, 20, 16, 0.12);
}

/* ---------- 时间轴 ---------- */
.page-about .tl-layout {
  display: grid;
  gap: 42px;
  margin-top: 34px;
}
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 28px;
  list-style: none;
}
.page-about .tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(184, 135, 59, 0.12));
}
.page-about .tl-item {
  position: relative;
  padding-bottom: 30px;
}
.page-about .tl-item:last-child {
  padding-bottom: 0;
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(184, 135, 59, 0.16);
}
.page-about .tl-year {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .tl-item h3 {
  margin: 7px 0 7px;
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .tl-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.88;
  color: rgba(26, 20, 16, 0.76);
}
.page-about .tl-figure {
  margin-top: 6px;
}

/* ---------- 数据条 ---------- */
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line-lime);
  border: 1px solid var(--line-lime);
}
.page-about .stat {
  padding: 22px 18px;
  background: rgba(7, 19, 14, 0.74);
  transition: background 0.3s var(--ease);
}
.page-about .stat:hover {
  background: rgba(18, 53, 42, 0.92);
}
.page-about .stat-num {
  display: block;
  font-family: var(--display);
  font-size: clamp(26px, 6vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}
.page-about .stat-unit {
  margin-left: 4px;
  font-size: 0.44em;
  vertical-align: 0.28em;
  letter-spacing: 0.02em;
}
.page-about .stat-label {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: rgba(243, 235, 221, 0.72);
}
.page-about .term-note {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
}
.page-about .term-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(243, 235, 221, 0.76);
}
.page-about .term-meta {
  margin-top: 10px !important;
  font-family: var(--mono);
  font-size: 12px !important;
  color: var(--grey-green);
}
.page-about .term-meta a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
}

/* ---------- 认证与合作 ---------- */
.page-about .cert-grid {
  display: grid;
  gap: 22px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .cert-item {
  padding-top: 16px;
  border-top: 2px solid var(--gold);
}
.page-about .cert-tag {
  display: block;
  margin-bottom: 9px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}
.page-about .cert-item h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.44;
  color: var(--ink);
}
.page-about .cert-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: rgba(26, 20, 16, 0.74);
}

/* ---------- 合作入口 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 34px;
}
.page-about .partner-copy p {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(243, 235, 221, 0.8);
}
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .contact-band {
  padding: 26px 22px;
  background: rgba(7, 19, 14, 0.74);
  border: 1px solid var(--line-lime);
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.38);
}
.page-about .about-contact {
  margin: 16px 0 0;
  padding: 0;
}
.page-about .about-contact-row {
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-contact-row:last-child {
  border-bottom: 0;
}
.page-about .about-contact dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .about-contact dd {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--cream);
  word-break: break-word;
}
.page-about .about-contact a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
}
.page-about .about-contact-note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--grey-green);
}
.page-about .about-contact-note a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .page-about .stat,
  .page-about .toc-list a {
    transition: none;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 359px) {
  .page-about .stat-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .toc-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 560px) {
  .page-about .toc-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .cert-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 30px;
  }
  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .chapter {
    padding: 74px 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .breadcrumb {
    padding-top: 34px;
  }
  .page-about .hero {
    padding: 48px 0 86px;
  }
  .page-about .hero-grid {
    grid-template-columns: 1.04fr 0.96fr;
    gap: 60px;
    align-items: center;
  }
  .page-about .chapter-grid {
    grid-template-columns: 0.88fr 1.12fr;
    gap: 62px;
    align-items: start;
  }
  .page-about .chapter-head--wide {
    max-width: 760px;
  }
  .page-about .tl-layout {
    grid-template-columns: 1.22fr 0.78fr;
    gap: 68px;
    align-items: start;
  }
  .page-about .tl-figure {
    margin-top: 12px;
  }
  .page-about .partner-grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 66px;
    align-items: start;
  }
  .page-about .chapter {
    padding: 92px 0;
  }
  .page-about .editorial-figure {
    margin-top: 34px;
  }
}

@media (min-width: 860px) {
  .page-about .toc-list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 8px 24px;
  }
}

@media (min-width: 1180px) {
  .page-about .hero h1 {
    max-width: 13em;
  }
  .page-about .stat-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}