.page-about {
  --about-pad: clamp(56px, 8vw, 100px);
  --about-line: rgba(242, 235, 221, 0.16);
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(26px, 5vw, 54px)) 0 var(--about-pad);
  background:
    radial-gradient(80% 62% at 92% 2%, rgba(59, 242, 200, 0.2), rgba(59, 242, 200, 0) 64%),
    radial-gradient(56% 54% at 0% 100%, rgba(255, 106, 61, 0.14), rgba(255, 106, 61, 0) 62%),
    linear-gradient(175deg, var(--ink) 0%, var(--night) 60%, #0a211c 100%);
  border-bottom: 2px solid rgba(59, 242, 200, 0.28);
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--cyan) 0 26px, transparent 26px 52px);
  opacity: 0.32;
}

.page-about .about-crumbs {
  margin-bottom: clamp(24px, 4vw, 40px);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--sage);
}

.page-about .about-crumbs a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(143, 168, 158, 0.55);
}

.page-about .cover-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: end;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--cyan);
}

.page-about .cover-title {
  margin: 14px 0 0;
  font-size: clamp(34px, 6vw, 72px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .cover-title span {
  color: var(--cyan);
}

.page-about .cover-lede {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.85;
  color: rgba(242, 235, 221, 0.82);
}

.page-about .cover-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cover-tags li {
  padding: 7px 12px;
  border: 2px solid rgba(242, 235, 221, 0.22);
  background: rgba(18, 54, 46, 0.55);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--cream);
}

.page-about .cover-tags li.is-brand {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .cover-media {
  position: relative;
  margin: 0;
  border: 2px solid rgba(59, 242, 200, 0.36);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.45);
  background: var(--panel);
  overflow: hidden;
}

.page-about .cover-media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .cover-media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 18px 16px 12px;
  background: linear-gradient(0deg, rgba(7, 26, 22, 0.94), rgba(7, 26, 22, 0));
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(242, 235, 221, 0.82);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .sec-head {
  max-width: 60ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .sec-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .sec-title {
  margin: 10px 0 0;
  font-size: var(--step-h2);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.015em;
}

.page-about .sec-lede {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: var(--step-body);
  line-height: 1.85;
  color: rgba(242, 235, 221, 0.76);
}

.page-about .wide-media {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border: 2px solid var(--about-line);
  background: var(--panel);
}

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

.page-about .wide-media figcaption {
  padding: 12px 16px;
  border-top: 2px solid rgba(242, 235, 221, 0.12);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(242, 235, 221, 0.64);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--night) 0%, #0b1826 100%);
  border-bottom: 2px solid var(--about-line);
}

.page-about .timeline-layout {
  display: grid;
  gap: 24px;
}

.page-about .year-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .year-jump a {
  display: block;
  padding: 7px 12px;
  border: 2px solid rgba(143, 168, 158, 0.32);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--sage);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .year-jump a:hover,
.page-about .year-jump a:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tl-track {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-item {
  position: relative;
  padding: 22px 0 0 20px;
  border-left: 2px solid rgba(59, 242, 200, 0.3);
  transition: border-color var(--dur) var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 20px;
  width: 12px;
  height: 12px;
  background: var(--night);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-title {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 700;
}

.page-about .tl-text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 235, 221, 0.72);
}

.page-about .timeline-layout:has(.year-jump li:nth-child(1) a:hover) .tl-item:nth-child(1),
.page-about .timeline-layout:has(.year-jump li:nth-child(2) a:hover) .tl-item:nth-child(2),
.page-about .timeline-layout:has(.year-jump li:nth-child(3) a:hover) .tl-item:nth-child(3),
.page-about .timeline-layout:has(.year-jump li:nth-child(4) a:hover) .tl-item:nth-child(4),
.page-about .timeline-layout:has(.year-jump li:nth-child(5) a:hover) .tl-item:nth-child(5) {
  border-color: var(--orange);
}

.page-about .timeline-layout:has(.year-jump li:nth-child(1) a:hover) .tl-item:nth-child(1)::before,
.page-about .timeline-layout:has(.year-jump li:nth-child(2) a:hover) .tl-item:nth-child(2)::before,
.page-about .timeline-layout:has(.year-jump li:nth-child(3) a:hover) .tl-item:nth-child(3)::before,
.page-about .timeline-layout:has(.year-jump li:nth-child(4) a:hover) .tl-item:nth-child(4)::before,
.page-about .timeline-layout:has(.year-jump li:nth-child(5) a:hover) .tl-item:nth-child(5)::before {
  border-color: var(--orange);
  background: var(--orange);
}

@media (min-width: 720px) {
  .page-about .tl-track {
    grid-template-columns: repeat(auto-fit, minmax(186px, 1fr));
    gap: 0;
  }

  .page-about .tl-item {
    padding: 30px 16px 0 0;
    border-left: 0;
    border-top: 2px solid rgba(59, 242, 200, 0.3);
  }

  .page-about .tl-item::before {
    top: -7px;
    left: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .timeline-layout {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .year-jump {
    flex-direction: column;
    gap: 4px;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .year-jump a {
    border-color: transparent;
    border-left: 2px solid rgba(143, 168, 158, 0.28);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--cream);
  color: var(--black);
  border-bottom: 2px solid rgba(10, 15, 13, 0.16);
}

.page-about .about-team .sec-no {
  color: #b23a14;
}

.page-about .about-team .sec-lede {
  color: rgba(10, 15, 13, 0.74);
}

.page-about .about-team .wide-media {
  border-color: rgba(10, 15, 13, 0.24);
  background: #0a0f0d;
}

.page-about .about-team .wide-media figcaption {
  border-top-color: rgba(242, 235, 221, 0.18);
}

.page-about .team-top {
  display: grid;
  gap: 24px;
}

.page-about .team-chart {
  padding: clamp(14px, 3vw, 26px);
  border: 2px solid var(--black);
  background: var(--ink);
  box-shadow: var(--hard-shadow);
}

.page-about .team-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .slots-title {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
}

.page-about .flow-list {
  display: grid;
  gap: 14px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-list li {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 12px;
  padding-top: 14px;
  border-top: 2px solid rgba(10, 15, 13, 0.16);
}

.page-about .flow-no {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: #b23a14;
}

.page-about .flow-list h4 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .flow-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(10, 15, 13, 0.74);
}

.page-about .team-roles {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-about .role-card {
  padding: 22px;
  border: 2px solid var(--black);
  background: #fbf6ec;
  box-shadow: 5px 5px 0 rgba(10, 15, 13, 0.14);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .role-card:hover {
  transform: translate(-3px, -3px);
  border-color: var(--panel);
  box-shadow: 6px 6px 0 var(--panel);
}

.page-about .role-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  color: var(--panel);
}

.page-about .role-card h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(10, 15, 13, 0.76);
}

.page-about .team-details {
  margin-top: clamp(24px, 4vw, 34px);
  border-top: 2px solid rgba(10, 15, 13, 0.2);
}

.page-about .team-details details {
  border-bottom: 2px solid rgba(10, 15, 13, 0.2);
}

.page-about .team-details summary {
  position: relative;
  padding: 16px 36px 16px 0;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-details summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--panel);
  transition: color var(--dur) var(--ease);
}

.page-about .team-details details[open] summary::after {
  content: "−";
  color: #b23a14;
}

.page-about .team-details p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(10, 15, 13, 0.78);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  background:
    radial-gradient(70% 58% at 100% 0%, rgba(59, 242, 200, 0.13), rgba(59, 242, 200, 0) 62%),
    var(--ink);
  border-bottom: 2px solid var(--about-line);
}

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

.page-about .scope-card {
  padding: 22px;
  border: 2px solid rgba(242, 235, 221, 0.18);
  background: rgba(18, 54, 46, 0.5);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease),
    transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .scope-card:hover {
  border-color: var(--cyan);
  background: rgba(18, 54, 46, 0.78);
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 rgba(59, 242, 200, 0.16);
}

.page-about .scope-tag {
  display: inline-block;
  padding: 3px 9px;
  border: 2px solid var(--cyan);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .scope-tag.tag-orange {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .scope-card h3 {
  margin: 14px 0 8px;
  font-size: 19px;
  font-weight: 800;
}

.page-about .scope-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 235, 221, 0.76);
}

.page-about .scope-band {
  display: grid;
  gap: 0;
  margin-top: clamp(26px, 4vw, 40px);
  border: 2px solid rgba(59, 242, 200, 0.3);
  background: rgba(13, 27, 46, 0.62);
}

.page-about .band-cell {
  padding: 20px 18px;
  border-bottom: 2px solid rgba(59, 242, 200, 0.18);
}

.page-about .band-cell:last-child {
  border-bottom: 0;
}

.page-about .band-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .band-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: rgba(242, 235, 221, 0.68);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  background: linear-gradient(160deg, var(--night) 0%, #0b1a2c 72%);
  border-bottom: 2px solid var(--about-line);
}

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

.page-about .partner-card {
  padding: 20px;
  border: 2px solid rgba(242, 235, 221, 0.16);
  background: rgba(7, 26, 22, 0.46);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .partner-card:hover {
  border-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 235, 221, 0.72);
}

.page-about .honor-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-top: 24px;
  padding: 18px 20px;
  border-left: 6px solid var(--amber);
  background: rgba(245, 184, 65, 0.1);
}

.page-about .honor-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}

.page-about .honor-strip p {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 235, 221, 0.82);
}

/* ---------- 索引 ---------- */
.page-about .about-index {
  background: var(--ink);
}

.page-about .index-grid {
  display: grid;
  gap: 12px;
}

.page-about .index-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 22px;
  border: 2px solid rgba(242, 235, 221, 0.2);
  background: rgba(18, 54, 46, 0.4);
  color: var(--cream);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease),
    transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(59, 242, 200, 0.1);
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 rgba(59, 242, 200, 0.18);
}

.page-about .idx-body {
  display: block;
}

.page-about .idx-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .idx-text {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(242, 235, 221, 0.82);
}

.page-about .idx-arrow {
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--cyan);
}

.page-about .to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 30px;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(59, 242, 200, 0.42);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .to-top:hover,
.page-about .to-top:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .scope-grid,
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .band-cell {
    border-right: 2px solid rgba(59, 242, 200, 0.18);
  }

  .page-about .band-cell:nth-child(2n) {
    border-right: 0;
  }
}

@media (min-width: 900px) {
  .page-about .cover-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

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

@media (min-width: 960px) {
  .page-about .team-top {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .scope-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .band-cell {
    border-bottom: 0;
    border-right: 2px solid rgba(59, 242, 200, 0.18);
  }

  .page-about .band-cell:nth-child(2n) {
    border-right: 2px solid rgba(59, 242, 200, 0.18);
  }

  .page-about .band-cell:last-child {
    border-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }

  .page-about .scope-card:hover,
  .page-about .index-link:hover,
  .page-about .index-link:focus-visible,
  .page-about .role-card:hover,
  .page-about .partner-card:hover {
    transform: none;
  }
}