.page-about {
  --about-gap: clamp(18px, 3.2vw, 32px);
  --about-hair: 1px solid var(--rail);
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--violet);
  margin-bottom: 14px;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(92px, 13vw, 150px) 0 clamp(36px, 5vw, 68px);
  background:
    radial-gradient(120% 90% at 84% 4%, rgba(122, 92, 255, 0.30), transparent 58%),
    radial-gradient(90% 70% at 6% 96%, rgba(61, 242, 214, 0.11), transparent 62%),
    linear-gradient(180deg, #060A18 0%, #0B1230 100%);
  border-bottom: var(--about-hair);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5.6vw, 3.6rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 46em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px dashed var(--rail);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  color: var(--amber);
  line-height: 1.1;
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

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

.page-about .about-hero__frame {
  position: relative;
  border: var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
  height: clamp(240px, 44vw, 420px);
  background: var(--panel);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: -1px;
  z-index: 2;
  pointer-events: none;
  background:
    linear-gradient(var(--cyan), var(--cyan)) left top / 20px 2px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) left top / 2px 20px no-repeat,
    linear-gradient(var(--amber), var(--amber)) right bottom / 20px 2px no-repeat,
    linear-gradient(var(--amber), var(--amber)) right bottom / 2px 20px no-repeat;
}

/* 通用两栏骨架 */
.page-about .about-track__grid,
.page-about .about-network__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-track__title,
.page-about .about-history__title,
.page-about .about-network__title,
.page-about .about-rhythm__title,
.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  line-height: 1.32;
  margin: 0;
}

.page-about .about-track__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-track__lede {
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-pillars {
  display: grid;
  gap: 14px;
}

.page-about .about-pillar {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--panel);
  border: var(--about-hair);
  border-radius: var(--radius);
  border-top-width: 3px;
  transition: transform 160ms ease, border-color 160ms ease;
}

.page-about .about-pillar:hover {
  transform: translateY(-2px);
}

.page-about .about-pillar--violet { border-top-color: var(--violet); }
.page-about .about-pillar--cyan { border-top-color: var(--cyan); }
.page-about .about-pillar--amber { border-top-color: var(--amber); }

.page-about .about-pillar__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .about-pillar__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* 发展历程 */
.page-about .about-history {
  background: linear-gradient(180deg, #0B1230 0%, #0D1530 100%);
  border-top: var(--about-hair);
  border-bottom: var(--about-hair);
}

.page-about .about-history__head {
  max-width: 62em;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-history__desc {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-history__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-history__figure {
  position: relative;
  border: var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
  height: clamp(220px, 40vw, 360px);
  background: var(--panel-2);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 4px;
  border-left: 1px solid var(--rail);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 26px 24px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(61, 242, 214, 0.08);
  transition: background 160ms ease, box-shadow 160ms ease;
}

.page-about .about-node:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(61, 242, 214, 0.14);
}

.page-about .about-node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 6px;
}

.page-about .about-node__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  margin: 0 0 6px;
}

.page-about .about-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* 团队分工 */
.page-about .about-team__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-team__card {
  position: relative;
  padding-top: 22px;
}

.page-about .about-team__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-team__card .card__title {
  margin-top: 8px;
}

.page-about .about-team__card .card__meta {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--rail);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-team__note {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--violet);
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* 协作生态 */
.page-about .about-network {
  background:
    radial-gradient(90% 100% at 100% 0%, rgba(122, 92, 255, 0.14), transparent 62%),
    var(--bg);
  border-top: var(--about-hair);
  border-bottom: var(--about-hair);
}

.page-about .about-network__lede {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-network__list li {
  padding: 12px 14px;
  background: rgba(122, 92, 255, 0.10);
  border: var(--about-hair);
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-network__list .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin-bottom: 4px;
}

.page-about .about-network__figure {
  position: relative;
  border: var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
  height: clamp(200px, 36vw, 320px);
  background: var(--panel-2);
  align-self: start;
}

/* 节奏 */
.page-about .about-rhythm {
  border-bottom: var(--about-hair);
}

.page-about .about-rhythm__head {
  margin-bottom: 22px;
}

.page-about .about-rhythm__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-rhythm__panel {
  padding: 22px 20px;
  border-radius: var(--radius);
}

.page-about .about-rhythm__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-rhythm__tag--cyan {
  color: var(--cyan);
}

.page-about .about-rhythm__panel-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  margin: 10px 0 8px;
  color: var(--ink);
}

.page-about .about-rhythm__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-rhythm__place {
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* 方法 */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: about-step;
}

.page-about .about-step {
  position: relative;
  padding: 20px 18px;
  background: var(--panel);
  border: var(--about-hair);
  border-radius: var(--radius);
}

.page-about .about-step__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--violet);
  padding: 2px 8px;
  border: 1px solid var(--rail);
  border-radius: 999px;
}

.page-about .about-step__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  margin: 12px 0 8px;
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-method__quote {
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 2px solid var(--amber);
  background: rgba(255, 181, 71, 0.06);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-method__quote p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

/* 行动区 */
.page-about .about-cta {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid rgba(122, 92, 255, 0.38);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 120% at 88% 10%, rgba(61, 242, 214, 0.16), transparent 58%),
    linear-gradient(140deg, rgba(122, 92, 255, 0.24) 0%, rgba(13, 21, 48, 0.92) 62%);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 48em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

/* 桌面分栏 */
@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-track__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-track__aside {
    position: sticky;
    top: 96px;
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-history__figure {
    height: 480px;
  }

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

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: center;
  }

  .page-about .about-network__figure {
    height: 340px;
  }
}