.page-about {
  --about-pad: clamp(48px, 6.5vw, 96px);
  --about-gap: clamp(16px, 1.8vw, 24px);
  --about-radius: 22px;
  --about-r-sm: 14px;
  display: block;
  color: var(--fog);
}

.page-about .container-wide,
.page-about .container {
  min-width: 0;
}

/* ============ 首屏拼贴 ============ */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 40px) 0 clamp(34px, 5vw, 64px);
}

.page-about .hero-mosaic {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(20px, 3vw, 34px);
  min-width: 0;
}

.page-about .hero-block {
  position: relative;
  min-width: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  padding: clamp(20px, 2.6vw, 32px);
  background: linear-gradient(155deg, rgba(16, 42, 71, 0.86), rgba(7, 20, 38, 0.7));
  overflow: hidden;
}

.page-about .hero-block--lead {
  border-color: rgba(24, 224, 208, 0.34);
  background:
    radial-gradient(120% 150% at 6% 0%, rgba(124, 77, 255, 0.3), transparent 58%),
    linear-gradient(155deg, #0c2440, #071426 72%);
}

.page-about .hero-block--lead::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -70%;
  width: 62%;
  height: 220px;
  background: radial-gradient(closest-side, rgba(24, 224, 208, 0.24), transparent);
  pointer-events: none;
}

.page-about .hero-block--lead .eyebrow {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  position: relative;
  z-index: 1;
  margin: 14px 0 18px;
  font-size: clamp(28px, 4.2vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .hero-lede {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 2;
  color: var(--steel);
}

.page-about .hero-meta {
  position: relative;
  z-index: 1;
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .hero-block--stat {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 8px;
  background: linear-gradient(160deg, rgba(11, 31, 56, 0.92), rgba(7, 20, 38, 0.62));
}

.page-about .hero-block--stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 46px;
  background: var(--cyan);
  border-radius: 0 3px 3px 0;
}

.page-about .hero-block--stat.is-amber::before { background: var(--amber); }
.page-about .hero-block--stat.is-violet::before { background: var(--violet); }

.page-about .hero-block--stat-a {
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(24, 224, 208, 0.18), transparent 62%),
    linear-gradient(160deg, rgba(11, 31, 56, 0.94), rgba(7, 20, 38, 0.66));
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.4vw, 50px);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .hero-block--stat.is-amber .stat-num { color: var(--amber); }
.page-about .hero-block--stat.is-violet .stat-num { color: var(--violet); }

.page-about .stat-unit {
  margin-left: 5px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--steel);
}

.page-about .stat-label {
  display: block;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--steel);
}

@media (min-width: 900px) {
  .page-about .hero-mosaic {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
  .page-about .hero-block--lead { grid-column: 1 / 8; grid-row: 1; }
  .page-about .hero-block--stat-a { grid-column: 8 / 13; grid-row: 1; }
  .page-about .hero-block--stat-b { grid-column: 1 / 5; grid-row: 2; }
  .page-about .hero-block--stat-c { grid-column: 5 / 9; grid-row: 2; }
  .page-about .hero-block--stat-d { grid-column: 9 / 13; grid-row: 2; }
}

/* ============ 章节索引导航 ============ */
.page-about .about-index {
  position: sticky;
  top: var(--header-h);
  z-index: 15;
  background: rgba(7, 20, 38, 0.94);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .index-list {
  display: flex;
  gap: clamp(12px, 2vw, 30px);
  margin: 0;
  padding: 13px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .index-list::-webkit-scrollbar { display: none; }

.page-about .index-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  white-space: nowrap;
  font-size: 13.5px;
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .index-list a:hover,
.page-about .index-list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .index-list .mono {
  font-size: 12px;
  color: var(--amber);
  letter-spacing: 0.08em;
}

/* ============ 通用章节 ============ */
.page-about .about-section {
  padding: var(--about-pad) 0;
}

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

.page-about .section-head {
  max-width: 74ch;
}

.page-about .section-title {
  margin: 12px 0 14px;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .section-desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 2;
  color: var(--steel);
}

/* ============ 时间线 ============ */
.page-about .timeline-wrap {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(30px, 4vw, 48px);
  min-width: 0;
}

@media (min-width: 980px) {
  .page-about .timeline-wrap {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 55%, var(--amber));
  opacity: 0.55;
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 clamp(26px, 3.4vw, 42px);
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(24, 224, 208, 0.12);
}

.page-about .tl-node:nth-child(3n + 2)::before {
  border-color: var(--violet);
  box-shadow: 0 0 0 4px rgba(124, 77, 255, 0.14);
}

.page-about .tl-node:nth-child(3n)::before {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 178, 62, 0.14);
}

.page-about .tl-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .tl-year {
  padding: 3px 10px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid rgba(255, 178, 62, 0.36);
  border-radius: 999px;
}

.page-about .tl-ver {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: clamp(16.5px, 1.9vw, 20px);
  line-height: 1.45;
  color: var(--fog);
}

.page-about .tl-text {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--steel);
}

.page-about .timeline-figure {
  margin: 0;
  border-radius: var(--about-radius);
}

.page-about .figure-cap {
  display: block;
  margin-top: 12px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* ============ 团队分工 ============ */
.page-about .team-split {
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
  min-width: 0;
}

@media (min-width: 980px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

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

.page-about .team-figure {
  margin: clamp(24px, 3vw, 36px) 0 0;
  border-radius: var(--about-radius);
}

.page-about .aside-note {
  margin: 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--line);
  font-size: 14.5px;
  line-height: 2;
  color: var(--steel);
}

.page-about .aside-stats {
  margin: clamp(22px, 2.6vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .aside-stats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .aside-stats li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .aside-stats .mono {
  flex: none;
  min-width: 54px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .aside-stats li:nth-child(2) .mono { color: var(--amber); }
.page-about .aside-stats li:nth-child(3) .mono { color: var(--violet); }

.page-about .aside-stats em {
  font-style: normal;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(30px, 4vw, 46px);
}

.page-about .tag-filter {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: rgba(16, 42, 71, 0.5);
  color: var(--steel);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .tag-filter:hover,
.page-about .tag-filter:focus-visible {
  color: var(--fog);
  border-color: var(--line);
}

.page-about .tag-filter[aria-pressed="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tag-filter[aria-pressed="true"]:nth-child(3) {
  background: var(--violet);
  border-color: var(--violet);
  color: var(--fog);
}

.page-about .team-grid {
  display: grid;
  gap: var(--about-gap);
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about [data-filter-item][hidden] {
  display: none;
}

@media (min-width: 780px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .team-card {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: linear-gradient(165deg, rgba(16, 42, 71, 0.74), rgba(11, 31, 56, 0.48));
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--line);
  transform: translateY(-3px);
}

.page-about .team-count {
  display: block;
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .team-card:nth-child(2) .team-count { color: var(--violet); }
.page-about .team-card:nth-child(3) .team-count { color: var(--amber); }

.page-about .team-count small {
  margin-left: 5px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--steel);
}

.page-about .team-card h3 {
  margin: 14px 0 12px;
  padding-bottom: 12px;
  font-size: 17.5px;
  line-height: 1.4;
  color: var(--fog);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .team-card li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .team-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .team-card:nth-child(2) li::before { background: var(--violet); }
.page-about .team-card:nth-child(3) li::before { background: var(--amber); }

/* ============ 更新节拍 ============ */
.page-about .rhythm-list {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .rhythm-item {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 2.3vw, 26px) 0;
  border-bottom: 1px solid var(--line-soft);
}

@media (min-width: 720px) {
  .page-about .rhythm-item {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }
}

.page-about .rhythm-label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .rhythm-body {
  margin: 0;
  max-width: 70ch;
  font-size: 15px;
  line-height: 2;
  color: var(--steel);
}

.page-about .rhythm-body strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
}

/* ============ 安心之选三入口 ============ */
.page-about .pillar-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(26px, 3.4vw, 40px);
}

@media (min-width: 880px) {
  .page-about .pillar-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .pillar {
  position: relative;
  min-width: 0;
  padding: clamp(22px, 2.6vw, 30px);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(124, 77, 255, 0.14), transparent 62%),
    linear-gradient(170deg, rgba(11, 31, 56, 0.9), rgba(7, 20, 38, 0.6));
  overflow: hidden;
}

.page-about .pillar::before {
  content: attr(data-idx);
  position: absolute;
  top: 10px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(124, 77, 255, 0.22);
  pointer-events: none;
}

.page-about .pillar h3 {
  margin: 0 0 12px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .pillar p {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--steel);
}

.page-about .pillar-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(24, 224, 208, 0.4);
  padding-bottom: 3px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .pillar-link::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .pillar-link:hover,
.page-about .pillar-link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .pillar-note {
  margin: clamp(24px, 3vw, 34px) 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--steel);
}

.page-about .pillar-note a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid rgba(230, 244, 255, 0.36);
}

.page-about .pillar-note a:hover,
.page-about .pillar-note a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ============ 协作生态 ============ */
.page-about .partners-layout {
  display: grid;
  gap: clamp(26px, 3.4vw, 46px);
  min-width: 0;
}

@media (min-width: 980px) {
  .page-about .partners-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    align-items: center;
  }
}

.page-about .partners-intro {
  min-width: 0;
}

.page-about .partners-figure {
  margin: 0;
  border-radius: var(--about-radius);
}

.page-about .partner-folds {
  margin-top: clamp(28px, 3.6vw, 44px);
  display: grid;
  gap: 12px;
}

.page-about .fold {
  border: 1px solid var(--line-soft);
  border-radius: var(--about-r-sm);
  background: rgba(16, 42, 71, 0.5);
  overflow: hidden;
  transition: border-color 0.2s var(--ease);
}

.page-about .fold[open] {
  border-color: var(--line);
}

.page-about .fold summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--fog);
}

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

.page-about .fold summary .mono {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--violet);
}

.page-about .fold summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .fold-body {
  margin: 0;
  padding: 0 20px 18px;
  max-width: 74ch;
  font-size: 14px;
  line-height: 1.95;
  color: var(--steel);
}

/* ============ 收尾 ============ */
.page-about .about-cta {
  padding: clamp(44px, 6vw, 86px) 0 clamp(58px, 7vw, 100px);
}

.page-about .cta-panel {
  display: grid;
  gap: 24px;
  padding: clamp(26px, 3.6vw, 50px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background:
    radial-gradient(95% 170% at 100% 0%, rgba(124, 77, 255, 0.28), transparent 62%),
    radial-gradient(80% 150% at 0% 100%, rgba(24, 224, 208, 0.16), transparent 60%),
    linear-gradient(150deg, #0b2340, #071426 78%);
}

@media (min-width: 880px) {
  .page-about .cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

.page-about .cta-title {
  margin: 12px 0 14px;
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1.32;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .cta-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 2;
  color: var(--steel);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .tag-filter,
  .page-about .index-list a,
  .page-about .pillar-link {
    transition: none;
  }
  .page-about .team-card:hover {
    transform: none;
  }
}
</main>