.page-about {
  --about-line: rgba(255, 255, 255, 0.14);
  --about-line-soft: rgba(255, 255, 255, 0.08);
  --about-panel: rgba(255, 255, 255, 0.06);
  --about-pad: clamp(56px, 8vw, 112px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 7vw, 88px) 0 clamp(56px, 8vw, 96px);
  background:
    radial-gradient(120% 110% at 88% -10%, rgba(18, 59, 122, 0.9) 0%, rgba(11, 27, 58, 0) 62%),
    radial-gradient(90% 80% at -10% 110%, rgba(124, 27, 43, 0.42) 0%, rgba(11, 27, 58, 0) 64%),
    var(--navy);
}

.page-about .hero-slash {
  position: absolute;
  right: -8%;
  top: 18%;
  width: 46%;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 106, 26, 0), rgba(255, 106, 26, 0.55));
  transform: rotate(-18deg);
  transform-origin: right center;
  pointer-events: none;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .hero-main h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: #fff;
}

.page-about .hero-lead {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .hero-main .btn-row {
  margin-top: 30px;
}

.page-about .hero-facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line);
  align-self: start;
}

.page-about .fact {
  padding: 18px 16px;
  background: rgba(11, 27, 58, 0.72);
}

.page-about .fact dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--silver);
  margin-bottom: 8px;
}

.page-about .fact dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}

.page-about .fact-num {
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.page-about .fact-unit {
  font-size: 13px;
  color: var(--silver);
}

/* ---------- 通用小节头 ---------- */
.page-about .sec-head {
  position: relative;
  margin-bottom: clamp(36px, 5vw, 64px);
  padding-left: 0;
}

.page-about .sec-head .u-annot {
  display: block;
  margin-bottom: 14px;
  color: var(--orange-soft);
}

.page-about .sec-head h2 {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(22px, 4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: #fff;
}

.page-about .sec-lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 历程时间轴 ---------- */
.page-about .about-arc {
  padding: var(--about-pad) 0;
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
}

.page-about .tl-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "photo"
    "tl";
  gap: 44px;
}

.page-about .tl-photo {
  grid-area: photo;
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .tl-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 7;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .tl-photo .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 40px 18px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--silver);
  background: linear-gradient(180deg, rgba(8, 20, 41, 0) 0%, rgba(8, 20, 41, 0.92) 70%);
}

.page-about .tl {
  grid-area: tl;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-item {
  position: relative;
  padding-left: 72px;
  padding-bottom: 44px;
}

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

.page-about .tl-item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(255, 106, 26, 0.6), rgba(255, 255, 255, 0.08));
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--orange);
  background: var(--navy-deep);
  box-sizing: border-box;
  transition: background var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .tl-item:hover::after {
  background: var(--orange);
  transform: scale(1.25);
}

.page-about .tl-year {
  position: absolute;
  left: 30px;
  top: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .tl-card {
  padding: 18px 20px 20px;
  background: var(--about-panel);
  border: 1px solid var(--about-line-soft);
  border-left: 2px solid rgba(255, 106, 26, 0.45);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .tl-item:hover .tl-card {
  border-color: var(--about-line);
  border-left-color: var(--orange);
  background: rgba(255, 255, 255, 0.075);
}

.page-about .tl-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 900;
  color: #fff;
}

.page-about .tl-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .tl-more {
  margin-top: 14px;
  border-top: 1px dashed var(--about-line);
  padding-top: 12px;
}

.page-about .tl-more summary {
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ice);
  transition: color var(--t) var(--ease);
}

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

.page-about .tl-more summary::before {
  content: "＋ ";
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-about .tl-more[open] summary::before {
  content: "－ ";
}

.page-about .tl-more summary:hover,
.page-about .tl-more summary:focus-visible {
  color: var(--orange);
}

.page-about .tl-more p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 月报制作 ---------- */
.page-about .about-monthly {
  padding: var(--about-pad) 0;
  background: var(--navy-deep);
}

.page-about .mr-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

.page-about .mr-photo {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .mr-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .mr-photo .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 44px 18px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--silver);
  background: linear-gradient(180deg, rgba(8, 20, 41, 0) 0%, rgba(8, 20, 41, 0.92) 72%);
}

.page-about .mr-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line);
  align-self: start;
}

.page-about .mr-step {
  position: relative;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 0 16px;
  padding: 24px 20px;
  background: var(--navy-deep);
  transition: background var(--t) var(--ease);
}

.page-about .mr-step:hover {
  background: rgba(255, 106, 26, 0.07);
}

.page-about .mr-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--orange);
  line-height: 1.2;
}

.page-about .mr-body h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 900;
  color: #fff;
}

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

.page-about .mr-time {
  grid-column: 2;
  justify-self: start;
  margin-top: 14px;
  padding: 4px 10px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--neon);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .mr-step:hover .mr-time,
.page-about .mr-step:focus-within .mr-time {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 数据解读 ---------- */
.page-about .about-metrics {
  padding: var(--about-pad) 0;
  background:
    linear-gradient(180deg, var(--navy-deep) 0%, rgba(124, 27, 43, 0.22) 55%, var(--navy-deep) 100%),
    var(--navy-deep);
}

.page-about .metric-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line);
}

.page-about .metric-card {
  position: relative;
  padding: 26px 22px 28px;
  background: rgba(8, 20, 41, 0.86);
  transition: background var(--t) var(--ease);
}

.page-about .metric-card:hover {
  background: rgba(18, 59, 122, 0.42);
}

.page-about .metric-idx {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ice);
  border: 1px solid rgba(111, 213, 242, 0.35);
}

.page-about .metric-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 900;
  color: #fff;
}

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

.page-about .scene-row {
  margin-top: clamp(32px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .scene {
  padding: 24px 22px;
  background: var(--paper);
  color: var(--ink);
  border-left: 4px solid var(--orange);
}

.page-about .scene-tag {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .scene h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 900;
  color: var(--ink);
}

.page-about .scene p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: #2c3644;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-pad) 0;
  background: var(--navy);
}

.page-about .team-photo {
  position: relative;
  margin: 0 0 clamp(32px, 4vw, 52px);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .team-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team-photo .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 50px 18px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--silver);
  background: linear-gradient(180deg, rgba(11, 27, 58, 0) 0%, rgba(11, 27, 58, 0.92) 72%);
}

.page-about .team-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .team-card {
  position: relative;
  padding: 26px 22px 24px;
  background: var(--about-panel);
  border: 1px solid var(--about-line-soft);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--orange);
  background: rgba(255, 106, 26, 0.06);
  transform: translateY(-4px);
}

.page-about .team-num {
  display: block;
  font-size: 44px;
  line-height: 1;
  font-weight: 700;
  color: rgba(255, 106, 26, 0.9);
  letter-spacing: -0.02em;
}

.page-about .team-card h3 {
  margin: 14px 0 10px;
  font-size: 17px;
  font-weight: 900;
  color: #fff;
}

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

.page-about .team-note {
  margin-top: 14px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line);
  font-size: 12px !important;
  letter-spacing: 0.04em;
  color: var(--orange-soft) !important;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-coverage {
  padding: var(--about-pad) 0;
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
}

.page-about .cov-band {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  gap: 3px;
  align-items: flex-end;
  height: 132px;
}

.page-about .cov-seg {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  border-radius: 2px 2px 0 0;
  transition: filter var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .cov-seg:hover,
.page-about .cov-seg:focus-within {
  filter: brightness(1.25);
  transform: translateY(-6px);
}

.page-about .cov-ne { height: 100%; background: linear-gradient(180deg, #FF6A1A, #7C1B2B); }
.page-about .cov-nc { height: 82%; background: linear-gradient(180deg, #6FD5F2, #123B7A); }
.page-about .cov-ec { height: 94%; background: linear-gradient(180deg, #2FE08A, #123B7A); }
.page-about .cov-cc { height: 68%; background: linear-gradient(180deg, #FFA45C, #7C1B2B); }
.page-about .cov-sc { height: 88%; background: linear-gradient(180deg, #6FD5F2, #0B1B3A); }
.page-about .cov-sw { height: 62%; background: linear-gradient(180deg, #FF6A1A, #123B7A); }
.page-about .cov-nw { height: 76%; background: linear-gradient(180deg, #C9D2DE, #123B7A); }

.page-about .cov-name {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 8px;
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.92);
  text-shadow: 0 1px 3px rgba(8, 20, 41, 0.9);
}

.page-about .cov-note {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  width: 178px;
  margin: 0;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  border-left: 3px solid var(--orange);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
  z-index: 3;
}

.page-about .cov-seg:hover .cov-note,
.page-about .cov-seg:focus-within .cov-note {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-about .cov-seg:first-child .cov-note {
  left: 0;
  transform: translateX(0) translateY(4px);
}

.page-about .cov-seg:first-child:hover .cov-note,
.page-about .cov-seg:first-child:focus-within .cov-note {
  transform: translateX(0) translateY(0);
}

.page-about .cov-seg:last-child .cov-note {
  left: auto;
  right: 0;
  transform: translateX(0) translateY(4px);
}

.page-about .cov-seg:last-child:hover .cov-note,
.page-about .cov-seg:last-child:focus-within .cov-note {
  transform: translateX(0) translateY(0);
}

.page-about .cov-foot {
  margin: 28px 0 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 内容协作 ---------- */
.page-about .about-collab {
  padding: var(--about-pad) 0;
  background: var(--navy-deep);
}

.page-about .collab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line);
}

.page-about .collab-block {
  padding: 28px 22px 30px;
  background: var(--navy-deep);
  transition: background var(--t) var(--ease);
}

.page-about .collab-block:hover {
  background: rgba(18, 59, 122, 0.4);
}

.page-about .collab-idx {
  display: block;
  margin-bottom: 14px;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}

.page-about .collab-honor .collab-idx {
  color: var(--neon);
}

.page-about .collab-block h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 900;
  color: #fff;
}

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

/* ---------- 收束 ---------- */
.page-about .about-next {
  padding: var(--about-pad) 0;
  background:
    radial-gradient(80% 100% at 100% 0%, rgba(255, 106, 26, 0.18) 0%, rgba(11, 27, 58, 0) 62%),
    var(--navy);
}

.page-about .next-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--about-line);
  background: rgba(255, 255, 255, 0.04);
}

.page-about .next-copy h2 {
  margin: 0 0 14px;
  font-size: clamp(20px, 3.4vw, 32px);
  font-weight: 900;
  line-height: 1.22;
  color: #fff;
}

.page-about .next-copy p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .next-links {
  display: grid;
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
  align-self: start;
}

.page-about .next-link {
  display: block;
  padding: 18px 20px;
  background: rgba(8, 20, 41, 0.7);
  text-decoration: none;
  transition: background var(--t) var(--ease), padding-left var(--t) var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  background: rgba(255, 106, 26, 0.12);
  padding-left: 26px;
}

.page-about .next-link-label {
  display: block;
  font-size: 15px;
  font-weight: 900;
  color: var(--orange);
  margin-bottom: 6px;
}

.page-about .next-link-desc {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .team-card-b {
    margin-top: 48px;
  }

  .page-about .team-card-c {
    margin-top: 20px;
  }

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

  .page-about .collab-honor {
    grid-column: 1 / -1;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .hero-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 8px;
  }

  .page-about .tl-wrap {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    grid-template-areas: "tl photo";
    gap: 64px;
    align-items: start;
  }

  .page-about .tl-photo {
    position: sticky;
    top: 96px;
  }

  .page-about .tl-photo img {
    aspect-ratio: 5 / 7;
  }

  .page-about .mr-wrap {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .mr-photo {
    position: sticky;
    top: 96px;
  }

  .page-about .metric-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .collab-honor {
    grid-column: auto;
  }

  .page-about .next-panel {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item::after,
  .page-about .tl-card,
  .page-about .team-card,
  .page-about .mr-step,
  .page-about .mr-time,
  .page-about .cov-seg,
  .page-about .cov-note,
  .page-about .next-link,
  .page-about .metric-card,
  .page-about .collab-block {
    transition: none;
  }

  .page-about .tl-item:hover::after,
  .page-about .team-card:hover,
  .page-about .cov-seg:hover,
  .page-about .cov-seg:focus-within {
    transform: none;
  }
}