.page-about {
  background: var(--paper);
  color: var(--ink);
  --about-gap: clamp(48px, 7vw, 88px);
}

.page-about .about-crumb {
  padding-top: 18px;
  font-size: 13px;
}

.page-about .media-frame {
  margin: 0;
  overflow: hidden;
  border-radius: 2px;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: 18px;
  padding: clamp(36px, 5vw, 64px) 0 clamp(40px, 6vw, 76px);
  color: var(--paper);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(201, 162, 75, 0.18), transparent 58%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-2) 62%, var(--ink-3) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 104px);
  opacity: 0.45;
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  padding: 6px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold-l);
}

.page-about .about-kicker-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cinnabar);
}

.page-about .about-hero h1 {
  margin: 20px 0 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero-lead {
  margin: 22px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.82);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-side .media-frame {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
}

.page-about .about-hero-cap {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(244, 239, 228, 0.62);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-chapter-num {
  display: block;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(54px, 8vw, 100px);
  line-height: 0.88;
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(201, 162, 75, 0.6);
}

.page-about .about-chapter-tag {
  display: block;
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: 0.18em;
  color: var(--loess);
}

.page-about .about-main h2 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 38px);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .about-main p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(11, 31, 51, 0.82);
}

/* ---------- 四条主轴 ---------- */

.page-about .about-axis {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-axis li {
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.72);
}

.page-about .about-axis-k {
  display: block;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-axis-v {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--loess);
}

/* ---------- 深色章节 ---------- */

.page-about .about-chapter--ink {
  background: linear-gradient(178deg, var(--ink) 0%, var(--ink-2) 100%);
  border-top-color: rgba(201, 162, 75, 0.35);
}

.page-about .about-chapter--ink .about-chapter-tag {
  color: var(--gold);
}

.page-about .about-chapter--ink .about-chapter-num {
  -webkit-text-stroke-color: rgba(231, 211, 160, 0.65);
}

.page-about .about-chapter--ink .about-main h2 {
  color: var(--gold-l);
}

.page-about .about-chapter--ink .about-main p {
  color: rgba(244, 239, 228, 0.78);
}

/* ---------- 价值三章 ---------- */

.page-about .about-values-grid {
  display: grid;
  gap: 32px;
  margin-top: 8px;
}

.page-about .about-value {
  padding: 22px 0 6px;
  border-top: 1px solid var(--line);
}

.page-about .about-value:first-child {
  padding-top: 4px;
  border-top: 0;
}

.page-about .about-value-k {
  display: block;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .about-value h3 {
  margin: 10px 0 10px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-value p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.76);
}

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

.page-about .about-values-figure .media-frame {
  aspect-ratio: 9 / 7;
  border: 1px solid var(--line);
}

.page-about .about-values-figure .media-caption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(244, 239, 228, 0.55);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 162, 75, 0.55), rgba(201, 162, 75, 0.08));
}

.page-about .about-tl {
  position: relative;
  padding-left: 34px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 18px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--gold);
}

.page-about .about-tl-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 8px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-tl-node[open] summary::after {
  content: "–";
}

.page-about .about-tl-node summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .about-tl-year {
  padding: 3px 10px;
  border-radius: 2px;
  background: var(--ink);
  color: var(--gold-l);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-tl-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17.5px;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-tl-body {
  padding: 2px 0 18px;
}

.page-about .about-tl-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(11, 31, 51, 0.72);
}

/* ---------- 覆盖与团队 ---------- */

.page-about .about-coverage {
  display: grid;
  gap: 1px;
  margin: 26px 0 34px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cov {
  padding: 20px 18px;
  background: rgba(255, 255, 255, 0.75);
}

.page-about .about-cov strong {
  display: block;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  color: var(--ink);
}

.page-about .about-cov span {
  display: block;
  margin-top: 9px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--loess);
}

.page-about .about-sub-h {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-team {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .about-team li {
  padding: 16px 16px 18px;
  border: 1px solid var(--line-ink);
  border-left: 2px solid var(--gold);
  background: rgba(255, 255, 255, 0.55);
}

.page-about .about-team h4 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--ink);
}

.page-about .about-team p {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.8;
  color: var(--loess);
}

/* ---------- 档案标签页 ---------- */

.page-about .about-tabs {
  margin-top: 26px;
}

.page-about .about-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-tabs .tab {
  appearance: none;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  color: var(--gold-l);
  font-family: var(--sans);
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-tabs .tab:hover {
  border-color: var(--gold);
}

.page-about .about-tabs .tab[aria-selected="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-3);
}

.page-about .about-tabs .tab:focus-visible {
  outline: 2px solid var(--gold-l);
  outline-offset: 2px;
}

.page-about .tabpanel {
  padding: 22px 0 0;
}

.page-about .tabpanel[hidden] {
  display: none;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-facts li {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-facts li:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-facts strong {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 15.5px;
  color: var(--gold-l);
}

.page-about .about-facts span {
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.78);
}

.page-about .about-archive-figure {
  margin: 32px 0 0;
}

.page-about .about-archive-figure .media-frame {
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
}

.page-about .about-archive-figure .media-caption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(244, 239, 228, 0.55);
}

/* ---------- 合作生态 ---------- */

.page-about .about-partner-grid {
  display: grid;
  gap: 12px;
  margin: 24px 0 26px;
}

.page-about .about-partner {
  padding: 20px 18px;
  border: 1px solid var(--line-ink);
  background: rgba(255, 255, 255, 0.6);
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--loess);
}

.page-about .about-inline-link {
  margin: 0;
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: clamp(44px, 6vw, 72px) 0;
  background: linear-gradient(140deg, var(--ink-2) 0%, var(--ink-3) 100%);
  border-top: 1px solid var(--line);
  color: var(--paper);
}

.page-about .about-cta-inner {
  display: grid;
  gap: 22px;
  align-items: center;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 32px);
  line-height: 1.32;
  color: var(--gold-l);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.78);
}

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

/* ---------- 响应式 ---------- */

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

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

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

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

  .page-about .about-facts li {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-aside {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 40px;
  }

  .page-about .about-values-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr);
    gap: 52px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 56px;
    align-items: end;
  }
}

@media (min-width: 1080px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tabs .tab {
    transition: none;
  }
}