.page-about {
  --about-node-w: 13px;
  --about-bar: 6px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  overflow-x: hidden;
}

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

.page-about .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px) 0 clamp(32px, 5vw, 76px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(16, 36, 31, 0.94) 0%, rgba(11, 20, 18, 1) 72%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.6;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-hero__nums {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__nums li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 12px 16px;
  background: var(--ink);
}

.page-about .about-hero__nums .mono {
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-hero__nums em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

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

.page-about .figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */

.page-about .section {
  padding-block: clamp(44px, 7vw, 92px);
}

.page-about .section + .section {
  border-top: 1px solid var(--line);
}

.page-about .section__index {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .section__title {
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about .section__lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 178, 94, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 时间轴 ---------- */

.page-about .about-filter {
  margin-top: 32px;
}

.page-about .about-filter .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

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

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--orange) 0%,
    var(--line) 14%,
    var(--line) 86%,
    rgba(30, 58, 51, 0) 100%
  );
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.6vw, 42px) clamp(32px, 4vw, 58px);
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: 0;
  top: 8px;
  width: var(--about-node-w);
  height: 2px;
  background: var(--orange);
  transition: width 0.25s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__node {
  width: calc(var(--about-node-w) + 8px);
}

.page-about .about-timeline__body {
  max-width: 64ch;
}

.page-about .about-timeline__stage {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__body p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.page-about .about-team__intro {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-roles {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles__k {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-roles__v {
  font-size: 16px;
  line-height: 1.72;
  color: var(--silver);
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 34px;
}

.page-about .about-partners__panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px 20px 22px;
  background: var(--ink);
  border: 1px solid var(--line);
}

.page-about .about-partners__panel--award {
  border-left: 2px solid var(--orange);
}

.page-about .about-partners__panel .panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-partners__panel .panel__head h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-partners__panel .num {
  font-size: 20px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-partners__panel .panel__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--silver);
}

.page-about .about-partners__note {
  margin: 28px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 规模 ---------- */

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.page-about .about-scale__intro {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-metrics {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-metrics__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "label value"
    "track track";
  gap: 10px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.page-about .about-metrics__label {
  grid-area: label;
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-metrics__val {
  grid-area: value;
  font-size: 18px;
  font-weight: 700;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .about-metrics__track {
  grid-area: track;
  position: relative;
  display: block;
  height: var(--about-bar);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-metrics__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--amber));
  transform-origin: left center;
  animation: about-bar-grow 700ms var(--ease) both;
}

.page-about .about-metrics__row:nth-child(1) .about-metrics__fill { width: 100%; }
.page-about .about-metrics__row:nth-child(2) .about-metrics__fill { width: 88%; }
.page-about .about-metrics__row:nth-child(3) .about-metrics__fill { width: 68%; }
.page-about .about-metrics__row:nth-child(4) .about-metrics__fill { width: 42%; }
.page-about .about-metrics__row:nth-child(5) .about-metrics__fill { width: 28%; }

@keyframes about-bar-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* ---------- 收尾 ---------- */

.page-about .about-next__title {
  margin: 12px 0 16px;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .about-next p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-roles li {
    grid-template-columns: minmax(120px, 168px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-metrics__row {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr) auto;
    grid-template-areas: "label track value";
    gap: 16px;
    align-items: center;
  }
}

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

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

  .page-about .about-team__media .figure {
    height: 100%;
    display: flex;
    flex-direction: column;
  }

  .page-about .about-team__media .figure__frame {
    flex: 1 1 auto;
  }

  .page-about .about-team__media .figure__frame img {
    height: 100%;
    object-fit: cover;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-timeline__item:nth-child(2n) .about-timeline__body {
    max-width: 56ch;
  }

  .page-about .about-timeline__item:nth-child(3n) .about-timeline__body {
    margin-left: 6%;
  }

  .page-about .about-timeline__item:nth-child(4n) .about-timeline__body {
    max-width: 70ch;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__nums {
    grid-template-columns: 1fr;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-metrics__fill {
    animation: none;
  }

  .page-about .about-timeline__node {
    transition: none;
  }

  .page-about .about-timeline__item:hover .about-timeline__node {
    width: var(--about-node-w);
  }
}