.page-about {
  --about-rail: 208px;
  --about-soft: rgba(27, 49, 82, .48);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-block: clamp(10px, 2vw, 22px) clamp(30px, 5vw, 64px);
}

.page-about .about-hero-frame {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5.2vw, 68px) clamp(20px, 4.4vw, 60px) clamp(24px, 4vw, 52px);
  border: 1px solid var(--line);
  background:
    radial-gradient(118% 96% at 8% 0%, rgba(0, 229, 199, .13), transparent 58%),
    radial-gradient(112% 84% at 98% 104%, rgba(255, 59, 92, .15), transparent 62%),
    linear-gradient(180deg, var(--about-soft), rgba(8, 18, 38, .22));
}

.page-about .about-hero-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(143, 161, 188, .075) 1px, transparent 1px);
  background-size: 100% 46px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
}

.page-about .about-hero-frame > * {
  position: relative;
  z-index: 1;
}

.page-about .about-pulse-line {
  display: block;
  width: 100%;
  height: 34px;
  color: var(--signal);
  opacity: .55;
  margin-bottom: 18px;
}

.page-about .about-eyebrow {
  margin: 0;
}

.page-about .about-hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 64px);
  line-height: 1.08;
  letter-spacing: -.012em;
  color: var(--white);
  margin: 14px 0 20px;
  max-width: 15em;
}

.page-about .about-hero-lede {
  max-width: 46em;
  color: var(--fog);
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.85;
}

.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--line);
}

.page-about .meta-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .meta-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  letter-spacing: -.01em;
}

.page-about .meta-cell:nth-child(2) .meta-num {
  color: var(--pulse);
}

.page-about .meta-cell:nth-child(4) .meta-num {
  color: var(--amber);
}

.page-about .meta-label {
  font-size: 12.5px;
  letter-spacing: .07em;
  color: var(--steel);
}

@media (min-width: 721px) {
  .page-about .about-hero-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 外壳与侧栏目录 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-bottom: clamp(52px, 8vw, 110px);
}

.page-about .about-toc {
  padding: 12px 0 14px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 10px;
  min-width: 0;
}

.page-about .about-toc-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--steel);
}

.page-about .about-toc-list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-toc-list > li {
  flex: 0 0 auto;
}

.page-about .about-toc-link {
  display: block;
  padding: 6px 10px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-toc-link:hover {
  color: var(--fog);
}

.page-about .about-toc-link[aria-current="true"] {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

@media (min-width: 961px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(38px, 5vw, 78px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    margin-bottom: 0;
    border-top: 1px solid var(--line-strong);
    border-bottom: 0;
    padding-top: 14px;
  }

  .page-about .about-toc-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc-list > li {
    flex: none;
  }

  .page-about .about-toc-link {
    padding: 9px 0 9px 14px;
    white-space: normal;
    border-bottom: 0;
    border-left: 2px solid transparent;
    font-size: 13.5px;
  }

  .page-about .about-toc-link[aria-current="true"] {
    border-bottom-color: transparent;
    border-left-color: var(--signal);
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-block: clamp(42px, 6.4vw, 88px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: clamp(26px, 4vw, 48px);
}

.page-about .about-section-head {
  max-width: 800px;
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.page-about .about-section-head .section-title {
  margin: 10px 0 14px;
}

.page-about .about-section-head .section-lede {
  margin: 0;
  color: var(--steel);
  font-size: 15px;
  line-height: 1.9;
}

.page-about .about-cols {
  display: grid;
  gap: 26px;
}

@media (min-width: 961px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 58px);
    align-items: start;
  }
}

.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--fog);
}

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

/* ---------- 旁注玻璃层 ---------- */
.page-about .about-note {
  padding: 22px 22px 18px;
  border-left: 2px solid var(--amber);
}

.page-about .note-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--amber);
}

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

.page-about .note-list > li {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.page-about .note-list > li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .note-key {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--signal);
}

.page-about .note-val {
  font-size: 13px;
  color: var(--steel);
  line-height: 1.6;
}

/* ---------- 配图 ---------- */
.page-about .about-media {
  margin: clamp(28px, 4vw, 48px) 0 0;
  border: 1px solid var(--line);
  background: var(--midnight);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.9) contrast(1.06);
}

.page-about .about-media .media-caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--steel);
  background: rgba(15, 31, 58, .7);
}

/* ---------- 规模数据 ---------- */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.page-about .stat-cell {
  min-width: 0;
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--signal);
  background: linear-gradient(180deg, var(--about-soft), rgba(8, 18, 38, .18));
  transition: border-top-color .2s ease, background .2s ease;
}

.page-about .stat-cell:nth-child(3n+2) {
  border-top-color: var(--pulse);
}

.page-about .stat-cell:nth-child(3n) {
  border-top-color: var(--amber);
}

.page-about .stat-cell:hover {
  background: linear-gradient(180deg, rgba(27, 49, 82, .72), rgba(8, 18, 38, .24));
}

.page-about .stat-label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--steel);
}

.page-about .stat-body {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 8px;
  margin: 0;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  letter-spacing: -.02em;
}

.page-about .stat-unit {
  font-size: 12.5px;
  color: var(--signal);
  letter-spacing: .04em;
}

.page-about .stat-note {
  flex: 0 0 100%;
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--steel);
}

@media (min-width: 721px) {
  .page-about .stat-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 使用场景 ---------- */
.page-about .scene-grid {
  display: grid;
  gap: 16px;
}

@media (min-width: 861px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .scene-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  background: rgba(15, 31, 58, .62);
  backdrop-filter: blur(6px);
  transition: transform .2s ease, border-color .2s ease;
}

.page-about .scene-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}

.page-about .scene-tag {
  align-self: flex-start;
}

.page-about .scene-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17.5px;
  line-height: 1.42;
  color: var(--white);
}

.page-about .scene-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 行动条 ---------- */
.page-about .rhythm-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: clamp(24px, 3.4vw, 38px);
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--signal);
  background: linear-gradient(90deg, rgba(0, 229, 199, .08), transparent 62%);
}

.page-about .rhythm-cta-text {
  margin: 0;
  flex: 1 1 260px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fog);
}

/* ---------- 团队 ---------- */
.page-about .crew-row {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .crew-cell {
  min-width: 0;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-bottom: 2px solid var(--pulse);
  background: linear-gradient(180deg, rgba(27, 49, 82, .42), rgba(8, 18, 38, .16));
}

.page-about .crew-cell:nth-child(2) {
  border-bottom-color: var(--signal);
}

.page-about .crew-cell:nth-child(3) {
  border-bottom-color: var(--amber);
}

.page-about .crew-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  letter-spacing: -.02em;
}

.page-about .crew-role {
  display: block;
  margin: 10px 0 10px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--signal);
}

.page-about .crew-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--steel);
}

@media (min-width: 861px) {
  .page-about .crew-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .eco-block {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  background: rgba(11, 18, 38, .5);
}

.page-about .eco-heading {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--steel);
}

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

.page-about .eco-node {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  grid-template-areas:
    "dot name count"
    "dot desc desc";
  gap: 4px 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--deep-teal);
  background: rgba(27, 49, 82, .34);
  transition: border-left-color .2s ease, background .2s ease;
}

.page-about .eco-node:hover {
  border-left-color: var(--signal);
  background: rgba(27, 49, 82, .6);
}

.page-about .eco-dot {
  grid-area: dot;
  align-self: center;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(0, 229, 199, .14);
}

.page-about .eco-name {
  grid-area: name;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .eco-count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .eco-desc {
  grid-area: desc;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--steel);
}

@media (min-width: 981px) {
  .page-about .eco-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .eco-node {
    grid-template-columns: 12px minmax(0, 1fr);
    grid-template-areas:
      "dot name"
      "dot count"
      "dot desc";
  }

  .page-about .eco-count {
    grid-area: count;
  }
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(180deg, var(--signal), rgba(0, 229, 199, .16) 58%, var(--pulse));
}

.page-about .timeline-item {
  position: relative;
  padding-left: 38px;
  padding-bottom: clamp(26px, 3.4vw, 40px);
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--signal);
  box-shadow: 0 0 0 4px rgba(0, 229, 199, .1);
}

.page-about .timeline-item:nth-child(4)::before,
.page-about .timeline-item:nth-child(5)::before {
  border-color: var(--pulse);
  box-shadow: 0 0 0 4px rgba(255, 59, 92, .12);
}

.page-about .timeline-version {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--pulse);
  margin-bottom: 8px;
}

.page-about .timeline-body {
  max-width: 68ch;
}

.page-about .timeline-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.4;
  color: var(--white);
}

.page-about .timeline-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--steel);
}

@media (min-width: 861px) {
  .page-about .timeline::before {
    left: 96px;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 0 30px;
    padding-left: 0;
    padding-right: 0;
  }

  .page-about .timeline-item::before {
    left: 89px;
    top: 10px;
  }

  .page-about .timeline-version {
    text-align: right;
    margin-bottom: 0;
  }

  .page-about .timeline-body {
    padding-left: 30px;
  }
}

/* ---------- 荣誉与服务地区 ---------- */
.page-about .honor-grid {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(26px, 4vw, 44px);
}

@media (min-width: 861px) {
  .page-about .honor-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .honor-card {
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
  background: linear-gradient(180deg, rgba(255, 162, 74, .07), rgba(8, 18, 38, .2));
}

.page-about .honor-card:nth-child(2) {
  border-top-color: var(--signal);
  background: linear-gradient(180deg, rgba(0, 229, 199, .07), rgba(8, 18, 38, .2));
}

.page-about .honor-year {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .honor-card:nth-child(2) .honor-year {
  color: var(--signal);
}

.page-about .honor-name {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.45;
  color: var(--white);
}

.page-about .honor-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .region-block {
  display: grid;
  gap: 24px;
  padding: clamp(20px, 3.2vw, 34px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--deep-teal);
  background: linear-gradient(120deg, rgba(11, 127, 115, .12), rgba(8, 18, 38, .35) 58%);
}

@media (min-width: 961px) {
  .page-about .region-block {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(26px, 3.6vw, 48px);
    align-items: center;
  }
}

.page-about .region-text p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--fog);
}

.page-about .region-title {
  margin: 8px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 27px);
  line-height: 1.35;
  color: var(--white);
}

.page-about .region-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .region-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--midnight);
}

.page-about .region-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 520px) {
  .page-about .stat-row {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-about .rhythm-cta {
    padding: 16px;
  }

  .page-about .region-actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}