.page-about {
  --about-gap: clamp(26px, 4vw, 60px);
  --about-sticky-top: 108px;
  --about-body: rgba(234, 240, 255, .84);
}

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(18px, 3vw, 34px) 0 clamp(24px, 3.6vw, 48px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -22%;
  right: -14%;
  width: min(560px, 80vw);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 62% 40%, rgba(168, 85, 247, .34), transparent 62%),
    radial-gradient(circle at 26% 76%, rgba(34, 211, 238, .20), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero .eyebrow {
  color: var(--neon-cyan);
  letter-spacing: .14em;
}

.page-about .about-hero__title {
  margin: .35em 0 .5em;
  max-width: 17em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 5.8vw, 56px);
  line-height: 1.1;
  letter-spacing: -.015em;
  color: var(--glass-white);
  text-shadow:
    0 0 1px rgba(168, 85, 247, .9),
    0 0 26px rgba(168, 85, 247, .38);
}

.page-about .about-hero__lede {
  max-width: 38em;
  margin: 0;
}

.page-about .about-hero__lede strong {
  color: var(--neon-cyan);
  font-weight: 600;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(24px, 3vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.page-about .about-stat__value {
  font-family: var(--font-num);
  font-size: clamp(24px, 3.4vw, 33px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--neon-cyan);
}

.page-about .about-stat__value small {
  font-size: .58em;
  color: var(--rank-orange);
  margin-left: 1px;
}

.page-about .about-stat .stat__label {
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--archive-blue);
}

.page-about img {
  max-width: 100%;
  display: block;
}

.page-about .about-shell {
  display: grid;
  gap: var(--about-gap);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-section {
  padding: clamp(26px, 3.4vw, 44px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section .section-title {
  margin: 0 0 .6em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.25;
  color: var(--glass-white);
}

.page-about .about-section .section-title::before {
  content: "";
  display: block;
  width: 46px;
  height: 3px;
  margin-bottom: 14px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--neon-purple), var(--neon-cyan));
}

.page-about .about-section p {
  max-width: 44em;
  margin: 0 0 1em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--about-body);
}

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

.page-about .about-section strong {
  color: var(--neon-cyan);
  font-weight: 600;
}

/* 三类项目 */
.page-about .about-projects {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-project {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(158deg, rgba(168, 85, 247, .15), rgba(23, 15, 43, .62) 60%);
}

.page-about .about-project::after {
  content: attr(data-index);
  position: absolute;
  top: 8px;
  right: 14px;
  font-family: var(--font-num);
  font-size: 30px;
  line-height: 1;
  color: rgba(234, 240, 255, .10);
  letter-spacing: .04em;
}

.page-about .about-project h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--glass-white);
}

.page-about .about-project p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--archive-blue);
}

/* 分区 */
.page-about .about-zone__visual {
  margin: 0 0 24px;
}

.page-about .about-zones {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-zone {
  padding: 18px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--rank-orange);
  border-radius: var(--radius);
  background: rgba(23, 15, 43, .62);
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .about-zone:hover {
  border-color: var(--line);
  border-left-color: var(--rank-orange);
  background: rgba(30, 20, 64, .80);
}

.page-about .about-zone h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--glass-white);
}

.page-about .about-zone__desc {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--archive-blue);
}

/* 折叠组 */
.page-about .accordion {
  border-top: 1px dashed var(--line-soft);
  padding-top: 8px;
}

.page-about .accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 7px 0;
  background: none;
  border: 0;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--neon-cyan);
  text-align: left;
}

.page-about .accordion-trigger::after {
  content: "+";
  flex: none;
  font-family: var(--font-num);
  font-size: 16px;
  line-height: 1;
  color: var(--neon-cyan);
  transition: transform .22s var(--ease);
}

.page-about .accordion-trigger[aria-expanded="true"]::after {
  transform: rotate(45deg);
}

.page-about .accordion-panel {
  padding: 2px 0 10px;
}

.page-about .accordion-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--archive-blue);
}

/* 团队 */
.page-about .about-team__visual {
  margin: 4px 0 24px;
}

.page-about .about-team-bars {
  display: grid;
  gap: 20px;
  margin-bottom: 22px;
}

.page-about .about-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .about-bar__name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--glass-white);
}

.page-about .about-bar__num {
  font-family: var(--font-num);
  font-size: 15px;
  color: var(--rank-orange);
  letter-spacing: .04em;
}

.page-about .about-bar__track {
  height: 10px;
  border-radius: 6px;
  background: rgba(109, 91, 168, .22);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--rank-orange), var(--neon-purple));
  box-shadow: 0 0 14px rgba(255, 138, 61, .38);
}

.page-about .about-bar--a .about-bar__fill { width: 33.4%; }
.page-about .about-bar--b .about-bar__fill { width: 22.2%; }
.page-about .about-bar--c .about-bar__fill { width: 44.4%; }

.page-about .about-bar__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--archive-blue);
}

.page-about .about-team__note {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-body);
}

/* 实测流程 */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 18px 18px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(23, 15, 43, .58);
}

.page-about .about-flow__num {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--rank-orange);
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--glass-white);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--archive-blue);
}

.page-about .about-dims {
  margin-top: 24px;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(140deg, rgba(34, 211, 238, .12), rgba(23, 15, 43, .58));
}

.page-about .about-dims__title {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--glass-white);
}

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

/* 生态 */
.page-about .about-eco-stats {
  display: grid;
  gap: 10px;
  margin: 22px 0;
}

.page-about .about-eco-stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  border-left: 3px solid var(--neon-purple);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(23, 15, 43, .62);
}

.page-about .about-eco-stat__value {
  font-family: var(--font-num);
  font-size: 26px;
  line-height: 1;
  color: var(--glass-white);
  letter-spacing: .02em;
}

.page-about .about-eco-stat__value small {
  font-size: .56em;
  color: var(--rank-orange);
}

.page-about .about-eco-stat__label {
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--archive-blue);
}

.page-about .about-eco {
  margin-bottom: 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 6px 18px 8px;
  background: rgba(23, 15, 43, .50);
}

.page-about .about-eco .accordion-item + .accordion-item {
  border-top: 1px solid var(--line-soft);
}

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

/* 右侧粘性档案索引 */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__inner {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px;
  background: linear-gradient(180deg, rgba(23, 15, 43, .86), rgba(11, 10, 18, .72));
}

.page-about .about-rail__visual {
  position: relative;
  margin: 0 0 18px;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
}

.page-about .about-rail__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .55;
}

.page-about .about-rail__head {
  margin-bottom: 10px;
}

.page-about .about-rail__head .eyebrow {
  margin: 0 0 4px;
  color: var(--neon-purple);
  letter-spacing: .16em;
}

.page-about .about-rail__hint {
  margin: 0;
  font-size: 12.5px;
  color: var(--archive-blue);
}

.page-about .about-index {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-index__node {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 11px;
  padding: 10px 10px 10px 4px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  text-decoration: none;
  color: var(--archive-blue);
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index__node:hover,
.page-about .about-index__node:focus-visible {
  color: var(--glass-white);
  background: rgba(168, 85, 247, .14);
  border-left-color: var(--rank-orange);
}

.page-about .about-index__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--rank-orange);
  background: transparent;
  transition: background .2s var(--ease);
}

.page-about .about-index__node:hover .about-index__dot,
.page-about .about-index__node:focus-visible .about-index__dot {
  background: var(--rank-orange);
  box-shadow: 0 0 10px rgba(255, 138, 61, .6);
}

.page-about .about-index__label {
  font-size: 14px;
  line-height: 1.45;
}

.page-about .about-index__num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(255, 138, 61, .72);
}

.page-about .about-rail__foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-rail__fact {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--archive-blue);
}

.page-about .about-rail__fact-num {
  font-family: var(--font-num);
  font-size: 15px;
  color: var(--neon-cyan);
  letter-spacing: .04em;
}

@media (min-width: 640px) {
  .page-about .about-projects {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: var(--about-sticky-top);
  }

  .page-about .about-section p {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-zone,
  .page-about .about-index__node,
  .page-about .accordion-trigger::after,
  .page-about .about-index__dot,
  .page-about .about-bar__fill {
    transition: none;
  }
}