.page-about {
  --about-line: rgba(227, 217, 198, 0.16);
  --about-line-soft: rgba(227, 217, 198, 0.09);
  --about-card: rgba(18, 40, 62, 0.82);
  display: block;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 66px) 0 clamp(40px, 6vw, 82px);
  background:
    radial-gradient(115% 95% at 84% 6%, rgba(217, 166, 60, 0.17), transparent 56%),
    radial-gradient(85% 80% at 4% 96%, rgba(111, 163, 155, 0.15), transparent 62%),
    var(--ink-900);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(233, 228, 216, 0.042) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 228, 216, 0.042) 1px, transparent 1px);
  background-size: 52px 52px;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(92% 82% at 50% 18%, #000 18%, transparent 86%);
  mask-image: radial-gradient(92% 82% at 50% 18%, #000 18%, transparent 86%);
}

.page-about .about-hero-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

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

.page-about .about-hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.2vw, 3.25rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--text-mist);
  margin: 0 0 18px;
  max-width: 24ch;
}

.page-about .about-lede {
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(233, 228, 216, 0.82);
  margin: 0;
  max-width: 56ch;
}

.page-about .about-hero-side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: rgba(8, 24, 42, 0.72);
  backdrop-filter: blur(6px);
}

.page-about .about-stat-num {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--gold-500);
  letter-spacing: 0.01em;
}

.page-about .about-stat-label {
  font-family: var(--font-body);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: rgba(233, 228, 216, 0.66);
}

/* ---------- 主体分栏 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(24px, 3.4vw, 42px);
  padding-block: clamp(34px, 5vw, 72px);
}

.page-about .about-rail-title {
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.22em;
  color: rgba(233, 228, 216, 0.5);
  margin: 0 0 12px;
  text-transform: uppercase;
}

.page-about .about-rail-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(30, 58, 85, 0.55);
  border: 1px solid transparent;
  color: rgba(233, 228, 216, 0.82);
  font-family: var(--font-display);
  font-size: var(--fs-14);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  background: rgba(217, 166, 60, 0.16);
  border-color: rgba(217, 166, 60, 0.5);
  color: var(--gold-200);
}

.page-about .about-rail-mark {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-500);
  flex: none;
}

/* ---------- 内容块 ---------- */

.page-about .about-block {
  padding-block: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 96px;
}

.page-about .about-flow > .about-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-serial {
  font-family: var(--font-serif);
  font-size: var(--fs-21);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold-500);
  margin: 0;
  flex: none;
}

.page-about .about-block-head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  line-height: 1.34;
  color: var(--text-mist);
  margin: 0;
}

.page-about .about-prose p,
.page-about .about-prose-p {
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(233, 228, 216, 0.82);
  max-width: 64ch;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-prose-p {
  margin: 0 0 24px;
}

.page-about .about-prose a,
.page-about .about-prose-p a,
.page-about .about-tl-text a {
  color: var(--gold-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(240, 214, 154, 0.45);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-prose a:hover,
.page-about .about-prose-p a:hover,
.page-about .about-tl-text a:hover {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}

.page-about .about-note {
  margin-top: 22px;
  padding: 16px 20px;
  background: var(--parchment-300);
  border-left: 3px solid var(--cinnabar-600);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  max-width: 58ch;
}

.page-about .about-note p {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-14);
  line-height: 1.82;
  color: var(--text-ink);
}

/* ---------- 图片容器 ---------- */

.page-about .about-banner,
.page-about .about-timeline-media,
.page-about .about-review-media {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background:
    repeating-linear-gradient(45deg, rgba(233, 228, 216, 0.035) 0 2px, transparent 2px 12px),
    var(--ink-700);
}

.page-about .about-banner img,
.page-about .about-timeline-media img,
.page-about .about-review-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-banner {
  margin-bottom: 24px;
}

.page-about .about-timeline-media {
  margin-bottom: 26px;
}

.page-about .about-review-media figcaption {
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: rgba(233, 228, 216, 0.62);
  border-top: 1px solid var(--about-line-soft);
}

/* ---------- 团队分组 ---------- */

.page-about .about-groups {
  display: grid;
  gap: 16px;
}

.page-about .about-group {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--about-card);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.page-about .about-group--gold::before {
  background: linear-gradient(90deg, var(--gold-500), rgba(217, 166, 60, 0.15));
}

.page-about .about-group--celadon::before {
  background: linear-gradient(90deg, var(--celadon-500), rgba(111, 163, 155, 0.15));
}

.page-about .about-group--cinnabar::before {
  background: linear-gradient(90deg, var(--cinnabar-600), rgba(168, 67, 42, 0.15));
}

.page-about .about-group-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-group-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-21);
  line-height: 1.3;
  color: var(--text-mist);
  margin: 0;
}

.page-about .about-group-count {
  font-family: var(--font-serif);
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--gold-500);
  flex: none;
}

.page-about .about-group-body {
  font-family: var(--font-body);
  font-size: var(--fs-14);
  line-height: 1.82;
  color: rgba(233, 228, 216, 0.78);
  margin: 0 0 14px;
}

.page-about .about-group-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-group-list li {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-body);
  font-size: var(--fs-14);
  line-height: 1.72;
  color: rgba(233, 228, 216, 0.62);
}

.page-about .about-group-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--gold-500);
}

/* ---------- 校审流程 ---------- */

.page-about .about-review {
  display: grid;
  gap: 22px;
}

.page-about .about-review-steps {
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  padding: 18px 20px;
  background: var(--about-card);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--gold-500);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
}

.page-about .about-step:nth-child(2) {
  border-left-color: var(--celadon-500);
}

.page-about .about-step:nth-child(3) {
  border-left-color: var(--cinnabar-600);
}

.page-about .about-step-num {
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--gold-500);
  margin: 0 0 8px;
}

.page-about .about-step:nth-child(2) .about-step-num {
  color: var(--celadon-500);
}

.page-about .about-step:nth-child(3) .about-step-num {
  color: var(--cinnabar-300);
}

.page-about .about-step-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-21);
  line-height: 1.35;
  color: var(--text-mist);
  margin: 0 0 10px;
}

.page-about .about-step-body {
  font-family: var(--font-body);
  font-size: var(--fs-14);
  line-height: 1.82;
  color: rgba(233, 228, 216, 0.76);
  margin: 0;
}

.page-about .about-step-more {
  margin-top: 12px;
  border-top: 1px solid var(--about-line-soft);
  padding-top: 10px;
}

.page-about .about-step-more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold-200);
}

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

.page-about .about-step-more summary::after {
  content: "＋";
  font-size: 0.95em;
  line-height: 1;
  color: var(--gold-500);
}

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

.page-about .about-step-more ul {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 7px;
}

.page-about .about-step-more li {
  position: relative;
  padding-left: 15px;
  font-family: var(--font-body);
  font-size: var(--fs-14);
  line-height: 1.72;
  color: rgba(233, 228, 216, 0.66);
}

.page-about .about-step-more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--celadon-500);
}

/* ---------- 覆盖指标 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(227, 217, 198, 0.28);
  border: 1px solid rgba(227, 217, 198, 0.28);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--parchment-100);
}

.page-about .about-metric-num {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3.6vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cinnabar-600);
}

.page-about .about-metric-label {
  font-family: var(--font-body);
  font-size: var(--fs-12);
  line-height: 1.65;
  color: rgba(34, 30, 26, 0.72);
}

/* ---------- 改版时间线 ---------- */

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

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 14px;
  bottom: 22px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold-500), rgba(217, 166, 60, 0.3) 52%, rgba(111, 163, 155, 0.72));
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 26px 34px;
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold-500);
  box-sizing: border-box;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-tl-item:hover::before {
  background: var(--gold-500);
}

.page-about .about-tl-item--current::before {
  border-color: var(--celadon-500);
  background: var(--celadon-500);
  box-shadow: 0 0 0 5px rgba(111, 163, 155, 0.18);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--fs-21);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold-500);
  margin-bottom: 4px;
}

.page-about .about-tl-item--current .about-tl-year {
  color: var(--celadon-500);
}

.page-about .about-tl-text {
  font-family: var(--font-body);
  font-size: var(--fs-14);
  line-height: 1.82;
  color: rgba(233, 228, 216, 0.76);
  margin: 0;
  max-width: 58ch;
}

/* ---------- 协作伙伴 ---------- */

.page-about .about-partners {
  display: grid;
  gap: 14px;
}

.page-about .about-partner-card {
  padding: 20px;
  background: rgba(30, 58, 85, 0.48);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  backdrop-filter: blur(4px);
}

.page-about .about-partner-card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-17);
  line-height: 1.4;
  color: var(--gold-200);
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(217, 166, 60, 0.28);
}

.page-about .about-partner-card p {
  font-family: var(--font-body);
  font-size: var(--fs-14);
  line-height: 1.82;
  color: rgba(233, 228, 216, 0.74);
  margin: 0;
}

/* ---------- 联系方式 ---------- */

.page-about .about-contact-list {
  margin: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-contact-row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-contact-row dt {
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: rgba(233, 228, 216, 0.5);
}

.page-about .about-contact-row dd {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--text-mist);
}

.page-about .about-contact-row dd a {
  color: var(--gold-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(240, 214, 154, 0.45);
}

.page-about .about-contact-row dd a:hover {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}

.page-about .about-contact-row--wide dd {
  font-size: var(--fs-14);
  line-height: 1.82;
  color: rgba(233, 228, 216, 0.72);
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 720px) {
  .page-about .about-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-contact-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .about-review {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    gap: 26px;
  }

  .page-about .about-review-media {
    position: sticky;
    top: 92px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: end;
    gap: clamp(34px, 5vw, 68px);
  }

  .page-about .about-hero-side {
    align-self: end;
  }

  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 4.4vw, 62px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    position: relative;
    padding-left: 0;
  }

  .page-about .about-rail-list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(180deg, var(--gold-500), rgba(111, 163, 155, 0.6) 58%, rgba(227, 217, 198, 0.14));
  }

  .page-about .about-rail-list li {
    position: relative;
  }

  .page-about .about-rail-list a {
    width: 100%;
    padding: 9px 10px 9px 24px;
    border-radius: var(--radius-s);
    background: transparent;
    border-color: transparent;
    font-weight: 700;
  }

  .page-about .about-rail-mark {
    position: absolute;
    left: 1px;
    top: 50%;
    transform: translateY(-50%);
    width: 7px;
    height: 7px;
    background: var(--ink-500);
    box-shadow: 0 0 0 3px var(--ink-900);
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
  }

  .page-about .about-rail-list a:hover .about-rail-mark,
  .page-about .about-rail-list a:focus-visible .about-rail-mark {
    background: var(--gold-500);
    box-shadow: 0 0 0 3px var(--ink-900), 0 0 0 6px rgba(217, 166, 60, 0.22);
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .page-about .about-timeline-list {
    padding-left: 8px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-hero-copy h1 {
    font-size: 3.4rem;
  }
}