/* ===================== page-about ===================== */

.page-about {
  --ab-rail: 240px;
  --ab-gap: clamp(28px, 4vw, 60px);
  --ab-pad: clamp(44px, 7vw, 92px);
  position: relative;
  background: var(--c-deep);
  color: var(--c-text);
  font-family: var(--f-sans);
  font-size: var(--t-body);
  line-height: 1.85;
  overflow-x: clip;
}

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

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: var(--r-b);
}

.page-about .about-crumb {
  padding-top: clamp(16px, 2.6vw, 28px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: clamp(14px, 2.2vw, 24px);
  padding: clamp(36px, 6vw, 72px) 0 clamp(46px, 7vw, 88px);
  border-top: 1px solid var(--c-grid);
  border-bottom: 1px solid var(--c-grid);
  background:
    radial-gradient(900px 480px at 78% -12%, rgba(34, 224, 255, .16), transparent 62%),
    radial-gradient(680px 400px at -8% 30%, rgba(30, 107, 255, .14), transparent 66%),
    linear-gradient(158deg, #050B1A 0%, #0A1730 58%, #050B1A 100%);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(29, 58, 92, .5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 58, 92, .5) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(120% 100% at 50% 0%, #000 25%, transparent 88%);
  mask-image: radial-gradient(120% 100% at 50% 0%, #000 25%, transparent 88%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: clamp(14px, 2vw, 22px) 0 clamp(18px, 2.6vw, 28px);
  font-size: clamp(2.3rem, 8vw, 4.9rem);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.035em;
}

.page-about .about-hero__l1,
.page-about .about-hero__l2,
.page-about .about-hero__l3 {
  display: block;
}

.page-about .about-hero__l2 em {
  font-style: normal;
  color: var(--c-cyan);
  text-shadow: var(--glow-cyan);
}

.page-about .about-hero__l3 {
  margin-top: clamp(10px, 1.6vw, 18px);
  font-size: clamp(1.02rem, 2.5vw, 1.45rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-dim);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.9;
  color: var(--c-dim);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-grid);
  border: 1px solid var(--c-grid);
  border-radius: var(--r-a) var(--r-b) var(--r-a) var(--r-b);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: clamp(16px, 2vw, 24px);
  background: linear-gradient(160deg, rgba(16, 36, 61, .95), rgba(10, 23, 48, .95));
}

.page-about .about-stat__value {
  font-family: var(--f-mono);
  font-size: clamp(1.8rem, 4.2vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  font-size: var(--t-sm);
  font-weight: 700;
  color: var(--c-text);
}

.page-about .about-stat__desc {
  font-size: var(--t-label);
  line-height: 1.6;
  color: var(--c-dim);
}

/* ---------- 图片容器 ---------- */

.page-about .media-frame {
  margin: 0;
}

.page-about .media-frame__inner {
  overflow: hidden;
  border: 1px solid var(--c-grid);
  border-radius: var(--r-a) var(--r-b) var(--r-a) var(--r-b);
  background: var(--c-panel);
  aspect-ratio: 2 / 1;
}

.page-about .media-frame__inner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media-frame__caption {
  margin-top: 10px;
  font-size: var(--t-label);
  letter-spacing: .04em;
  color: var(--c-dim);
}

.page-about .about-hero__figure {
  margin-top: clamp(32px, 5vw, 54px);
}

/* ---------- 主体栅格 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 42px);
  padding-top: var(--ab-pad);
  padding-bottom: var(--ab-pad);
}

.page-about .about-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* ---------- 章节索引 ---------- */

.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail .anchor-index__title {
  display: none;
}

.page-about .about-rail .anchor-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail .anchor-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail .anchor-index__list li {
  flex: 0 0 auto;
}

.page-about .about-rail .anchor-index__link {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--c-grid);
  border-radius: var(--r-a) var(--r-b) var(--r-a) var(--r-b);
  font-size: var(--t-sm);
  white-space: nowrap;
  color: var(--c-dim);
  text-decoration: none;
  transition: color .16s ease, border-color .16s ease, background .16s ease;
}

.page-about .about-rail .anchor-index__link:hover,
.page-about .about-rail .anchor-index__link[aria-current="location"] {
  color: var(--c-cyan);
  border-color: rgba(34, 224, 255, .55);
  background: rgba(34, 224, 255, .08);
}

/* ---------- 章节公共 ---------- */

.page-about .about-chapter {
  position: relative;
  padding: clamp(32px, 5vw, 62px) 0;
  border-top: 1px solid var(--c-grid);
}

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

.page-about .about-chapter--tint {
  padding-inline: clamp(0px, 1.8vw, 24px);
  border-radius: var(--r-a);
  background:
    linear-gradient(180deg, rgba(10, 23, 48, .85), rgba(10, 23, 48, 0) 78%),
    radial-gradient(720px 300px at 0% 0%, rgba(34, 224, 255, .06), transparent 68%);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 clamp(12px, 2vw, 20px);
  margin-bottom: clamp(24px, 3.4vw, 38px);
}

.page-about .about-chapter__num {
  padding-top: .55em;
  font-family: var(--f-mono);
  font-size: var(--t-label);
  letter-spacing: .1em;
  color: var(--c-faint);
  transition: color .24s ease;
}

.page-about .about-chapter[data-active] .about-chapter__num {
  color: var(--c-cyan);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.2vw, 2.125rem);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-chapter__lead {
  grid-column: 2;
  margin: clamp(10px, 1.4vw, 16px) 0 0;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--c-dim);
}

/* ---------- 01 场景 ---------- */

.page-about .about-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-grid);
  border-top: 1px solid var(--c-grid);
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-scene {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px) clamp(18px, 2.2vw, 26px);
  background: var(--c-deep);
  transition: background .16s ease;
}

.page-about .about-scene::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(20px, 2.4vw, 28px);
  bottom: clamp(20px, 2.4vw, 28px);
  width: 2px;
  background: var(--c-grid);
  transition: background .16s ease;
}

.page-about .about-scene:hover {
  background: var(--c-panel);
}

.page-about .about-scene:hover::before {
  background: var(--c-cyan);
}

.page-about .about-scene__title {
  margin: 0 0 8px;
  font-size: var(--t-3);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.page-about .about-scene__text {
  margin: 0;
  font-size: var(--t-sm);
  line-height: 1.85;
  color: var(--c-dim);
}

/* ---------- 02 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 38px);
}

.page-about .about-team__media .media-frame__inner {
  aspect-ratio: 3 / 2;
}

.page-about .about-team__body {
  min-width: 0;
}

.page-about .about-team-bar {
  display: grid;
  grid-template-columns: 86fr 18fr 16fr;
  gap: 3px;
  height: 46px;
  border-radius: var(--r-a) var(--r-b) var(--r-a) var(--r-b);
  overflow: hidden;
  background: var(--c-deep);
}

.page-about .about-team-bar__seg {
  display: block;
  height: 100%;
}

.page-about .about-team-bar__seg--a {
  background: linear-gradient(180deg, var(--c-cyan), #1a9fbb);
}

.page-about .about-team-bar__seg--b {
  background: linear-gradient(180deg, var(--c-blue), #1549ad);
}

.page-about .about-team-bar__seg--c {
  background: linear-gradient(180deg, var(--c-warm), #bf6122);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px 16px;
  padding: 14px 10px 14px 4px;
  border-top: 1px solid var(--c-grid);
  transition: background .16s ease;
}

.page-about .about-role:hover {
  background: rgba(29, 58, 92, .28);
}

.page-about .about-role__count {
  grid-column: 1;
  grid-row: 1 / span 2;
  align-self: start;
  min-width: 2.8ch;
  font-family: var(--f-mono);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1.15;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__name {
  grid-column: 2;
  grid-row: 1;
  font-size: 1rem;
  font-weight: 700;
}

.page-about .about-role__duty {
  grid-column: 2;
  grid-row: 2;
  font-size: var(--t-sm);
  line-height: 1.75;
  color: var(--c-dim);
}

.page-about .about-team__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: clamp(18px, 2.4vw, 24px) 0 0;
  font-size: var(--t-sm);
  color: var(--c-dim);
}

.page-about .about-team__metrics .num {
  margin-right: 4px;
  font-family: var(--f-mono);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--c-mist);
  font-variant-numeric: tabular-nums;
}

/* ---------- 03 记录闭环 ---------- */

.page-about .about-pipeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .about-pipeline__step {
  position: relative;
  padding: 4px 0 4px clamp(16px, 2.4vw, 22px);
  border-left: 2px solid var(--c-grid);
}

.page-about .about-pipeline__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--f-mono);
  font-size: var(--t-label);
  letter-spacing: .12em;
  color: var(--c-warm);
}

.page-about .about-pipeline__name {
  margin: 0 0 10px;
  font-size: var(--t-3);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-pipeline__step p {
  margin: 0;
  font-size: var(--t-sm);
  line-height: 1.85;
  color: var(--c-dim);
}

.page-about .about-record__note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 14px 18px;
  border-left: 2px solid var(--c-ok);
  border-radius: 0 var(--r-a) var(--r-a) 0;
  background: rgba(63, 217, 160, .07);
  font-size: var(--t-sm);
  line-height: 1.8;
  color: var(--c-text);
}

.page-about .about-record__note .status-dot {
  flex: 0 0 auto;
  margin-top: .62em;
}

/* ---------- 04 年度演进 ---------- */

.page-about .about-years__figure {
  margin: 0 0 clamp(26px, 3.4vw, 40px);
}

.page-about .about-years {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-years::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan), rgba(29, 58, 92, .25));
}

.page-about .about-years__item {
  position: relative;
  padding-left: 34px;
}

.page-about .about-years__node {
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-years__summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 14px 34px 14px 0;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-years__summary::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-panel);
  border: 1px solid var(--c-grid);
  transition: background .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.page-about .about-years__summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 14px;
  font-family: var(--f-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--c-dim);
  transition: color .16s ease;
}

.page-about .about-years__node[open] > .about-years__summary::before {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  box-shadow: 0 0 12px rgba(34, 224, 255, .5);
}

.page-about .about-years__node[open] > .about-years__summary::after {
  content: "−";
  color: var(--c-cyan);
}

.page-about .about-years__summary:hover .about-years__label {
  color: var(--c-cyan);
}

.page-about .about-years__era {
  padding: 2px 9px;
  border: 1px solid rgba(34, 224, 255, .35);
  border-radius: var(--r-b) var(--r-a) var(--r-b) var(--r-a);
  font-family: var(--f-mono);
  font-size: var(--t-label);
  letter-spacing: .08em;
  color: var(--c-cyan);
  white-space: nowrap;
}

.page-about .about-years__label {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  transition: color .16s ease;
}

.page-about .about-years__body {
  max-width: 70ch;
  padding: 0 0 18px;
}

.page-about .about-years__body p {
  margin: 0;
  font-size: var(--t-sm);
  line-height: 1.9;
  color: var(--c-dim);
}

/* ---------- 05 规范与合作 ---------- */

.page-about .about-certs {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .about-cert {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(22px, 2.8vw, 30px);
  border-radius: 28px 4px 28px 4px;
  background: linear-gradient(150deg, rgba(34, 224, 255, .09), rgba(16, 36, 61, .55) 58%, rgba(255, 138, 61, .07));
}

.page-about .about-cert__value {
  font-family: var(--f-mono);
  font-size: clamp(1.7rem, 3.4vw, 2.25rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-cert__label {
  font-size: var(--t-sm);
  font-weight: 700;
  color: var(--c-text);
}

.page-about .about-cert p {
  margin: 4px 0 0;
  font-size: var(--t-sm);
  line-height: 1.85;
  color: var(--c-dim);
}

.page-about .about-partners {
  margin-top: clamp(26px, 3.6vw, 40px);
}

.page-about .about-partners__title {
  margin: 0 0 14px;
  font-size: var(--t-3);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-partners__item {
  display: grid;
  gap: 4px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-partners__item:first-child {
  border-top: 1px solid var(--c-grid);
}

.page-about .about-partners__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .about-partners__desc {
  font-size: var(--t-sm);
  line-height: 1.8;
  color: var(--c-dim);
}

/* ---------- 收尾入口 ---------- */

.page-about .about-next {
  padding: clamp(44px, 6.5vw, 84px) 0;
  border-top: 1px solid var(--c-grid);
  background: linear-gradient(180deg, var(--c-abyss), var(--c-deep));
}

.page-about .about-next__title {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--c-grid);
  border: 1px solid var(--c-grid);
  border-radius: var(--r-a) var(--r-b) var(--r-a) var(--r-b);
  overflow: hidden;
}

.page-about .about-next__item a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: clamp(18px, 2.2vw, 26px);
  background: linear-gradient(160deg, rgba(16, 36, 61, .95), rgba(10, 23, 48, .95));
  color: inherit;
  text-decoration: none;
  transition: background .16s ease;
}

.page-about .about-next__item a:hover {
  background: linear-gradient(160deg, rgba(30, 107, 255, .22), rgba(16, 36, 61, .95));
}

.page-about .about-next__item a::after {
  content: "→";
  margin-top: auto;
  padding-top: 10px;
  font-family: var(--f-mono);
  font-size: 1.05rem;
  color: var(--c-warm);
}

.page-about .about-next__link-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-text);
}

.page-about .about-next__link-desc {
  font-size: var(--t-sm);
  line-height: 1.7;
  color: var(--c-dim);
}

/* ===================== 断点 ===================== */

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

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

@media (min-width: 760px) {
  .page-about .about-certs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-pipeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--c-grid);
    border: 1px solid var(--c-grid);
    border-radius: var(--r-a) var(--r-b) var(--r-a) var(--r-b);
    overflow: hidden;
  }

  .page-about .about-pipeline__step {
    padding: clamp(20px, 2.6vw, 28px);
    border-left: 0;
    background: linear-gradient(165deg, rgba(16, 36, 61, .9), rgba(10, 23, 48, .9));
  }

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: var(--ab-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail .anchor-index {
    border-left: 1px solid var(--c-grid);
    padding-left: 18px;
  }

  .page-about .about-rail .anchor-index__title {
    display: block;
    margin: 0 0 12px;
    font-family: var(--f-mono);
    font-size: var(--t-label);
    letter-spacing: .12em;
    color: var(--c-faint);
  }

  .page-about .about-rail .anchor-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail .anchor-index__link {
    display: block;
    padding: 8px 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: var(--t-sm);
    line-height: 1.6;
    color: var(--c-dim);
  }

  .page-about .about-rail .anchor-index__link::before {
    content: "";
    display: inline-block;
    width: 0;
    height: 1px;
    margin-right: 0;
    vertical-align: middle;
    background: var(--c-cyan);
    transition: width .2s ease, margin-right .2s ease;
  }

  .page-about .about-rail .anchor-index__link:hover,
  .page-about .about-rail .anchor-index__link[aria-current="location"] {
    color: var(--c-cyan);
    background: none;
  }

  .page-about .about-rail .anchor-index__link[aria-current="location"]::before {
    width: 16px;
    margin-right: 8px;
  }

  .page-about .about-chapter__lead {
    padding-left: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}