.page-about {
  --about-index-w: 214px;
  display: block;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: 16px;
}

/* 区块节奏 */
.page-about .about-band {
  padding-block: clamp(40px, 6vw, 84px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(20px, 3vw, 36px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -25% -12% auto -12%;
  height: 74%;
  background:
    radial-gradient(58% 78% at 18% 0%, rgba(53, 224, 214, 0.14), transparent 70%),
    radial-gradient(48% 70% at 86% 8%, rgba(242, 160, 61, 0.12), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-size: clamp(32px, 5.2vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--warm-white);
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.78;
  color: var(--gray-soft);
}

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

.page-about .about-hero-figure .media-frame {
  aspect-ratio: 16 / 9;
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero-figure img,
.page-about .about-team-figure img,
.page-about .about-eco-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero-stats > li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--ink-2);
}

.page-about .about-stat-num {
  font-size: clamp(28px, 3.8vw, 40px);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stat-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray-soft);
}

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }
}

/* ============ 历程：左侧索引 + 右侧正文 ============ */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 54px);
}

.page-about .about-index-label {
  margin: 0;
  color: var(--gray);
}

.page-about .about-index-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13px;
  text-decoration: none;
  color: var(--gray-soft);
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index-link .mono {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--warm-white);
  background: var(--cyan-soft);
  border-color: rgba(53, 224, 214, 0.5);
}

.page-about .about-story-body .section-head {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-phase {
  position: relative;
  padding: 0 0 clamp(26px, 3.6vw, 40px) clamp(18px, 2.4vw, 28px);
  border-left: 1px solid var(--line-dark);
  scroll-margin-top: 96px;
}

.page-about .about-phase:last-of-type {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--amber-soft);
}

.page-about .about-phase-mark {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-phase h3 {
  margin: 10px 0 8px;
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.32;
  font-weight: 700;
  color: var(--warm-white);
}

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

.page-about .about-story-body .note {
  margin-top: clamp(24px, 3.4vw, 38px);
}

@media (min-width: 920px) {
  .page-about .about-split {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 40px;
  }

  .page-about .about-index-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    margin-top: 14px;
  }

  .page-about .about-index-link {
    white-space: normal;
    border: 0;
    border-left: 2px solid var(--line-dark);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 9px 12px;
    font-size: 14px;
  }

  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible {
    border-left-color: var(--cyan);
  }
}

/* ============ 服务覆盖：奶油纸面 ============ */
.page-about .about-scale {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-scale-head .eyebrow {
  color: var(--vermilion);
}

.page-about .about-h2 {
  margin: 8px 0 0;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-lede-ink {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-3);
}

.page-about .about-matrix {
  margin-top: clamp(26px, 4vw, 42px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

.page-about .about-datum {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--paper);
}

.page-about .about-datum-num {
  margin: 0;
  font-size: clamp(30px, 3.6vw, 42px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--teal-ink);
}

.page-about .about-datum-num::after {
  content: "";
  display: block;
  width: 30px;
  height: 2px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--amber), var(--vermilion));
}

.page-about .about-datum-text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-3);
}

@media (min-width: 640px) {
  .page-about .about-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-matrix {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-team-grid {
  margin-top: clamp(30px, 4.5vw, 54px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

.page-about .about-team-copy h3 {
  margin: 0 0 14px;
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.32;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team-copy p {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-3);
}

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

.page-about .about-team-figure {
  aspect-ratio: 3 / 2;
  box-shadow: var(--shadow-paper);
}

@media (min-width: 880px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
  }
}

/* ============ 三层培训 ============ */
.page-about .about-training {
  position: relative;
}

.page-about .about-sub {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--gray-soft);
}

.page-about .about-tiers {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-tier {
  position: relative;
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(20, 27, 33, 0.72);
  border: 1px solid var(--line-dark);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius);
}

.page-about .about-tier--adv {
  border-top-color: var(--amber);
}

.page-about .about-tier--accept {
  border-top-color: var(--vermilion);
}

.page-about .about-tier-tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-tier--adv .about-tier-tag {
  color: var(--amber);
}

.page-about .about-tier--accept .about-tier-tag {
  color: var(--vermilion);
}

.page-about .about-tier h3 {
  margin: 12px 0 0;
  font-size: clamp(19px, 2.1vw, 23px);
  line-height: 1.3;
  font-weight: 700;
  color: var(--warm-white);
}

.page-about .about-tier-audience {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-tier-body {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray-soft);
}

.page-about .about-tier-hours {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-dark);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--warm-white);
}

@media (min-width: 820px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(14px, 2vw, 22px);
    align-items: start;
  }

  .page-about .about-tiers > li:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .about-tiers > li:nth-child(3) {
    margin-top: 60px;
  }
}

/* ============ 合作生态 ============ */
.page-about .about-eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 48px);
}

.page-about .about-eco .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 3vw, 34px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-eco .tabpanel {
  padding-top: 20px;
}

.page-about .about-eco .tabpanel p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--gray-soft);
}

.page-about .about-panel-meta {
  margin: 0 !important;
  font-size: 13px !important;
  letter-spacing: 0.06em;
  color: var(--amber) !important;
}

.page-about .about-eco-figure {
  aspect-ratio: 3 / 2;
  box-shadow: var(--shadow-lift);
}

@media (min-width: 900px) {
  .page-about .about-eco-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

/* ============ 收尾 ============ */
.page-about .about-cta {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-cta-inner {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  padding: clamp(28px, 4vw, 52px);
  background: linear-gradient(140deg, var(--teal-ink), var(--ink-2) 62%);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
}

.page-about .about-cta-inner::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber), var(--vermilion));
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(23px, 2.8vw, 32px);
  line-height: 1.26;
  font-weight: 700;
  color: var(--warm-white);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 50ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--gray-soft);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: flex-start;
}

@media (min-width: 860px) {
  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: center;
  }

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

/* 窄屏兜底 */
@media (max-width: 480px) {
  .page-about .about-hero-actions .btn,
  .page-about .about-cta-links .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}