.page-about {
  --about-pad: clamp(44px, 6vw, 88px);
  --about-gap: clamp(22px, 3.4vw, 44px);
}

.page-about [id] {
  scroll-margin-top: 92px;
}

.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 30px);
}

/* 首屏 */
.page-about .about-hero {
  padding-block: clamp(18px, 3vw, 32px) var(--about-pad);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .about-eyebrow-mono {
  color: var(--gold);
  letter-spacing: 0.08em;
  margin-left: 8px;
}

.page-about .about-hero-title {
  margin: 12px 0 0;
  font-size: clamp(36px, 5.6vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .about-hero-lede {
  margin: 20px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.2vw, 17.5px);
  line-height: 1.78;
  color: rgba(242, 247, 244, 0.84);
}

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

.page-about .about-hero-visual {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  padding: clamp(16px, 2.6vw, 28px);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 74% 18%, rgba(43, 245, 214, 0.16), transparent 62%),
    radial-gradient(circle at 20% 88%, rgba(255, 106, 42, 0.12), transparent 58%),
    rgba(16, 63, 58, 0.55);
}

.page-about .about-hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43, 245, 214, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 245, 214, 0.075) 1px, transparent 1px);
  background-size: 30px 30px;
  pointer-events: none;
}

.page-about .about-orbit {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
}

.page-about .orbit-ring {
  fill: none;
  stroke: rgba(43, 245, 214, 0.18);
  stroke-width: 1;
}

.page-about .orbit-ring--inner {
  stroke: rgba(168, 201, 194, 0.16);
}

.page-about .orbit-ticks {
  fill: none;
  stroke: rgba(43, 245, 214, 0.28);
  stroke-width: 2;
}

.page-about .orbit-arc {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2.4;
  stroke-linecap: round;
  opacity: 0.72;
}

.page-about .orbit-node {
  fill: var(--cyan);
}

.page-about .orbit-node--gold {
  fill: var(--gold);
}

.page-about .orbit-node--hollow {
  fill: none;
  stroke: var(--orange);
  stroke-width: 1.8;
}

.page-about .orbit-num {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 34px;
  letter-spacing: 0.06em;
  text-anchor: middle;
}

.page-about .orbit-label {
  fill: var(--muted);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-anchor: middle;
}

.page-about .about-orbit-caption {
  position: relative;
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  text-align: center;
}

/* 首屏指标带 */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(30px, 4.4vw, 52px);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--line);
}

.page-about .about-figure {
  background: var(--ink-soft);
  padding: 18px 18px 20px;
}

.page-about .fig-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.6vw, 34px);
  letter-spacing: 0.06em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .fig-num--orange {
  color: var(--orange);
}

.page-about .fig-unit {
  font-size: 0.5em;
  letter-spacing: 0.04em;
  margin-left: 4px;
  color: var(--muted);
}

.page-about .fig-label {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* 章节骨架 */
.page-about .about-sec {
  padding-block: var(--about-pad);
}

.page-about .about-sec--indigo {
  background: linear-gradient(180deg, rgba(46, 36, 80, 0.5), rgba(5, 35, 31, 0) 78%);
}

.page-about .about-sec--deep {
  background: linear-gradient(180deg, rgba(10, 58, 49, 0.66), rgba(5, 35, 31, 0) 82%);
}

.page-about .about-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(26px, 3.6vw, 44px);
}

.page-about .about-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.8vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-sec-lede {
  margin: 14px 0 0;
  font-size: clamp(14.5px, 1.1vw, 16.5px);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-h3 {
  margin: 6px 0 8px;
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--mist);
}

/* 非对称分栏 */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-main,
.page-about .about-aside {
  min-width: 0;
}

.page-about .about-aside-year {
  margin: 6px 0 14px;
  font-family: var(--font-mono);
  font-size: clamp(40px, 6vw, 72px);
  letter-spacing: 0.08em;
  line-height: 1;
  color: rgba(43, 245, 214, 0.58);
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  font-size: clamp(15px, 1.12vw, 17px);
  line-height: 1.82;
  color: rgba(242, 247, 244, 0.84);
}

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

.page-about .about-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-points li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 10px;
  background: rgba(16, 63, 58, 0.55);
  border-left: 2px solid rgba(43, 245, 214, 0.5);
  font-size: 14px;
  line-height: 1.65;
  color: rgba(242, 247, 244, 0.86);
}

.page-about .about-point-tag {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-text-link {
  display: inline-block;
  margin-top: 20px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 42, 0.45);
  padding-bottom: 2px;
}

.page-about .about-text-link:hover,
.page-about .about-text-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: rgba(43, 245, 214, 0.6);
}

/* 时间线 */
.page-about .about-timeline {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
}

.page-about .about-year-nav-title {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .year-list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0 0 14px;
  padding: 0 0 8px;
  overflow-x: auto;
}

.page-about .year-link {
  display: block;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
}

.page-about .year-link:hover,
.page-about .year-link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .tl-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 32px 26px;
  border-left: 1px solid rgba(168, 201, 194, 0.24);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 245, 214, 0.14);
}

.page-about .tl-item--gold::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 75, 0.16);
}

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .tl-item--gold .tl-year {
  color: var(--gold);
}

.page-about .tl-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(242, 247, 244, 0.8);
}

/* 图片位 */
.page-about .about-shot {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--ink-soft);
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-shot figcaption {
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .about-shot--slim {
  margin-bottom: clamp(22px, 3vw, 34px);
}

/* 团队 */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-tree-wrap {
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(16, 63, 58, 0.42);
  padding: 14px;
}

.page-about .about-tree {
  display: block;
  width: 100%;
  min-width: 560px;
  height: auto;
}

.page-about .tree-line {
  fill: none;
  stroke: rgba(43, 245, 214, 0.4);
  stroke-width: 1.4;
}

.page-about .tree-root {
  fill: rgba(43, 245, 214, 0.13);
  stroke: var(--cyan);
  stroke-width: 1.2;
}

.page-about .tree-node {
  fill: rgba(10, 58, 49, 0.86);
  stroke: rgba(43, 245, 214, 0.3);
  stroke-width: 1;
}

.page-about .tree-node--gold {
  fill: rgba(201, 162, 75, 0.12);
  stroke: rgba(201, 162, 75, 0.5);
}

.page-about .tree-root-num {
  fill: var(--cyan);
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.06em;
  text-anchor: middle;
}

.page-about .tree-root-label {
  fill: var(--muted);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-anchor: middle;
}

.page-about .tree-text {
  fill: var(--mist);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
}

.page-about .tree-sub {
  fill: var(--muted);
  font-family: var(--font-body);
  font-size: 11.5px;
}

.page-about .about-role-row {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-role {
  padding: 18px 18px 20px;
  border-radius: 12px;
  background: rgba(46, 36, 80, 0.42);
  border-top: 2px solid rgba(43, 245, 214, 0.42);
}

.page-about .about-role--gold {
  border-top-color: rgba(201, 162, 75, 0.66);
}

.page-about .about-role-k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-role--gold .about-role-k {
  color: var(--gold);
}

.page-about .about-role p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 247, 244, 0.82);
}

/* 服务与地址卡 */
.page-about .about-card {
  border-radius: 16px;
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(16, 63, 58, 0.6);
  border: 1px solid var(--line);
}

.page-about .about-card-k {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-card-addr {
  margin: 0 0 20px;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-dl {
  margin: 0 0 20px;
}

.page-about .about-dl-row {
  display: grid;
  gap: 2px;
  padding: 11px 0;
  border-top: 1px solid rgba(168, 201, 194, 0.16);
}

.page-about .about-dl-row:last-child {
  border-bottom: 1px solid rgba(168, 201, 194, 0.16);
}

.page-about .about-dl dt {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-dl dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  color: var(--mist);
  word-break: break-word;
}

/* 合作生态横向带 */
.page-about .about-eco {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .eco-item {
  flex: 0 0 clamp(220px, 70vw, 264px);
  scroll-snap-align: start;
  padding: 20px 20px 22px;
  border-radius: 14px;
  background: rgba(10, 58, 49, 0.8);
  border: 1px solid rgba(43, 245, 214, 0.2);
}

.page-about .eco-item--gold {
  background: rgba(94, 31, 42, 0.34);
  border-color: rgba(201, 162, 75, 0.42);
}

.page-about .eco-num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 34px);
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--cyan);
}

.page-about .eco-num span {
  font-size: 0.44em;
  color: var(--muted);
  margin-left: 4px;
}

.page-about .eco-num--text {
  font-size: clamp(18px, 2vw, 22px);
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .eco-name {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--mist);
}

.page-about .eco-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-eco-hint {
  margin: 4px 0 0;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: rgba(168, 201, 194, 0.7);
}

/* 版本对照 */
.page-about .about-ver-grid {
  display: grid;
  gap: 14px;
}

.page-about .ver-card {
  border-radius: 14px;
  border: 1px solid rgba(201, 162, 75, 0.36);
  background: rgba(94, 31, 42, 0.28);
  overflow: hidden;
}

.page-about .ver-card--v2 {
  border-color: rgba(43, 245, 214, 0.36);
  background: rgba(16, 63, 58, 0.62);
}

.page-about .ver-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 6px 12px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ver-summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .ver-title {
  font-size: clamp(16px, 1.4vw, 18px);
  font-weight: 600;
  color: var(--mist);
}

.page-about .ver-hint {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ver-summary::after {
  content: "展开字段 +";
  grid-column: 1 / -1;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .ver-card--v2 .ver-summary::after {
  color: var(--cyan);
}

.page-about .ver-card[open] .ver-summary::after {
  content: "收起 −";
}

.page-about .ver-list {
  list-style: none;
  margin: 0;
  padding: 0 20px 22px;
  display: grid;
  gap: 12px;
}

.page-about .ver-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 247, 244, 0.84);
}

.page-about .ver-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--gold);
}

.page-about .ver-card--v2 .ver-list li::before {
  background: var(--cyan);
}

/* 收束 */
.page-about .about-cta-wrap {
  padding-bottom: clamp(48px, 7vw, 92px);
}

.page-about .about-cta {
  border-radius: 20px;
  padding: clamp(26px, 4vw, 52px);
  border: 1px solid rgba(255, 106, 42, 0.34);
  background:
    radial-gradient(circle at 88% 12%, rgba(255, 106, 42, 0.2), transparent 58%),
    linear-gradient(140deg, rgba(46, 36, 80, 0.62), rgba(10, 58, 49, 0.66));
}

.page-about .about-cta .about-h2 {
  margin-top: 10px;
}

.page-about .about-cta-text {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.84);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 62px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-timeline {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-year-nav {
    position: sticky;
    top: 96px;
    align-self: start;
    padding-right: 12px;
  }

  .page-about .year-list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
  }

  .page-about .year-link {
    border: none;
    border-left: 2px solid rgba(168, 201, 194, 0.24);
    border-radius: 0;
    padding: 4px 0 4px 14px;
    font-size: 14px;
  }

  .page-about .year-link:hover,
  .page-about .year-link:focus-visible {
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-text-link,
  .page-about .year-link {
    transition: none;
  }
}