/* ============================================================
   88优德体育 · 品牌与历程（/introduction/）
   页面作用域：.page-about
   ============================================================ */

.page-about {
  --about-rule: 2px solid var(--ink-900);
  --about-hair: 1px solid var(--stone-300);
  background: var(--paper-50);
  color: var(--ink-900);
  overflow-x: clip;
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */

.page-about .crumbs {
  padding-block: clamp(1rem, 2.5vw, 1.5rem) 0;
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-label);
  font-size: .8125rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.page-about .crumbs li {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

.page-about .crumbs li + li::before {
  content: "/";
  color: var(--stone-300);
}

.page-about .crumbs a {
  color: var(--slate-700);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: border-color var(--motion);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  border-bottom-color: var(--card-yellow);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--ink-900);
  font-weight: 600;
}

/* ---------- 通用图组 ---------- */

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

.page-about .figure-block .media {
  border: var(--about-rule);
  overflow: hidden;
  background: var(--paper-100);
}

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

.page-about .media-caption {
  margin: .75rem 0 0;
  padding-left: .875rem;
  border-left: 2px solid var(--stone-300);
  font-size: .8125rem;
  line-height: 1.72;
  color: var(--slate-700);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: var(--about-rule);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: start;
}

.page-about .eyebrow {
  color: var(--clay-500);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4.2vw, 3.15rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: .75rem 0 1.25rem;
  text-wrap: balance;
}

.page-about .lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(1rem, 1.35vw, 1.125rem);
  line-height: 1.9;
  color: var(--slate-700);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1px;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
  background: var(--stone-300);
  border: var(--about-rule);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .875rem 1rem;
  background: var(--paper-50);
}

.page-about .hero-stats .num {
  font-family: var(--font-num);
  font-size: 1.4rem;
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--ink-900);
}

.page-about .hero-stats .stat-label {
  font-size: .8125rem;
  line-height: 1.55;
  color: var(--slate-700);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  position: relative;
  padding-block: clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-chapter + .about-chapter {
  border-top: var(--about-hair);
}

.page-about .band-paper {
  background: var(--paper-100);
}

.page-about .band-moss {
  background: var(--moss-600);
  color: var(--paper-50);
}

.page-about .ch-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .ch-aside {
  display: flex;
  align-items: baseline;
  gap: .75rem;
}

.page-about .section-num {
  font-family: var(--font-num);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1;
  color: var(--stone-300);
  transition: color 220ms ease-out;
}

.page-about [data-section][data-active] .section-num,
.page-about [data-section]:hover .section-num {
  color: var(--clay-500);
}

.page-about .ch-kicker {
  margin: 0;
  font-family: var(--font-label);
  font-size: .8125rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--moss-600);
}

.page-about .ch-body h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  line-height: 1.34;
  margin: 0 0 1.125rem;
  text-wrap: balance;
}

.page-about .ch-body > p {
  margin: 0 0 1.125rem;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--slate-700);
}

.page-about .ch-body h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  line-height: 1.45;
  margin: 0 0 .4rem;
  color: var(--ink-900);
}

.page-about .ch-body p {
  font-size: .9375rem;
  line-height: 1.85;
}

/* ---------- 旁注 ---------- */

.page-about .ch-note {
  padding-left: 1.125rem;
  border-left: var(--about-hair);
  font-size: .875rem;
  line-height: 1.78;
  color: var(--slate-700);
}

.page-about .ch-note p {
  margin: 0 0 .6rem;
}

.page-about .ch-note p:last-child {
  margin-bottom: 0;
}

.page-about .note-title {
  font-family: var(--font-label);
  font-size: .75rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--clay-500);
}

/* ---------- 延伸入口 ---------- */

.page-about .ch-more {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin: 1.75rem 0 0;
}

.page-about .support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin: 0;
}

/* ---------- 01 主张清单 ---------- */

.page-about .principle-list {
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .principle-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .4rem;
  padding: clamp(1.125rem, 2.5vw, 1.5rem) 0;
  border-bottom: var(--about-hair);
}

.page-about .principle-list h3 {
  margin: 0;
}

.page-about .principle-list p {
  margin: 0;
  max-width: 58ch;
  color: var(--slate-700);
}

/* ---------- 02 服务对象 ---------- */

.page-about .audience-list {
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: aud;
}

.page-about .audience-list li {
  position: relative;
  margin-bottom: .75rem;
  padding: 1.25rem 1.25rem 1.25rem 3.5rem;
  border: var(--about-hair);
  background: var(--paper-50);
  counter-increment: aud;
}

.page-about .audience-list li::before {
  content: counter(aud, decimal-leading-zero);
  position: absolute;
  left: 1.125rem;
  top: 1.3rem;
  font-family: var(--font-num);
  font-size: 1rem;
  color: var(--clay-500);
}

.page-about .audience-list h3 {
  margin: 0 0 .4rem;
}

.page-about .audience-list p {
  margin: 0;
  color: var(--slate-700);
}

/* ---------- 03 时间线 ---------- */

.page-about .timeline-photo {
  margin: 0 0 clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .timeline {
  margin: 0;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  list-style: none;
  background: var(--ink-900);
  color: var(--paper-50);
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .35rem;
  padding: 1.25rem 0 1.25rem 1.75rem;
  border-bottom: 1px solid rgba(198, 192, 178, .24);
  transition: background-color 160ms ease-out;
}

.page-about .tl-item:first-child {
  padding-top: .5rem;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.65rem;
  width: .6rem;
  height: .6rem;
  border-radius: 50%;
  background: var(--clay-500);
  box-shadow: 0 0 0 3px rgba(180, 112, 78, .22);
}

.page-about .tl-item:first-child::before {
  top: .9rem;
}

.page-about .tl-year {
  font-family: var(--font-num);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--card-yellow);
  transition: color 160ms ease-out;
}

.page-about .tl-item:hover .tl-year,
.page-about .tl-item:focus-within .tl-year {
  color: var(--paper-50);
}

.page-about .tl-item h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--paper-50);
}

.page-about .tl-item p {
  margin: 0;
  max-width: 62ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(251, 249, 245, .78);
}

/* ---------- 04 团队 ---------- */

.page-about .team-block {
  padding: 1.125rem 0;
  border-bottom: var(--about-hair);
}

.page-about .team-block:first-of-type {
  border-top: var(--about-rule);
}

.page-about .team-block h3 {
  margin: 0 0 .4rem;
}

.page-about .team-block p {
  margin: 0;
  max-width: 60ch;
  color: var(--slate-700);
}

.page-about .ch-body .figure-block {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

/* ---------- 05 内容来源 ---------- */

.page-about .source-list {
  margin: 1.75rem 0 0;
  border-top: var(--about-rule);
}

.page-about .source-list article {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .5rem;
  padding: clamp(1.125rem, 2.5vw, 1.5rem) 0;
  border-bottom: var(--about-hair);
}

.page-about .source-tag {
  margin: 0;
  font-family: var(--font-label);
  font-size: .8125rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--moss-600);
}

.page-about .source-copy h3 {
  margin: 0 0 .4rem;
}

.page-about .source-copy p {
  margin: 0;
  max-width: 58ch;
  color: var(--slate-700);
}

/* ---------- 06 支持 ---------- */

.page-about .band-moss .ch-kicker {
  color: var(--card-yellow);
}

.page-about .band-moss .ch-body h2 {
  color: var(--paper-50);
}

.page-about .band-moss .ch-body > p {
  color: rgba(251, 249, 245, .88);
}

.page-about .band-moss .section-num {
  color: rgba(251, 249, 245, .38);
}

.page-about .band-moss [data-section][data-active] .section-num,
.page-about .band-moss:hover .section-num {
  color: var(--card-yellow);
}

.page-about .band-moss .ch-note {
  border-left-color: rgba(251, 249, 245, .42);
  color: rgba(251, 249, 245, .85);
}

.page-about .band-moss .note-title {
  color: var(--card-yellow);
}

.page-about .band-moss a.btn:not(.btn-primary) {
  border-color: var(--paper-50);
  color: var(--paper-50);
  background: transparent;
}

.page-about .band-moss a.btn:not(.btn-primary):hover,
.page-about .band-moss a.btn:not(.btn-primary):focus-visible {
  background: var(--paper-50);
  color: var(--moss-600);
}

.page-about .reach-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 1.5rem 0 2rem;
  padding: 0;
  background: rgba(251, 249, 245, .24);
  border: 1px solid rgba(251, 249, 245, .3);
}

.page-about .reach-list > div {
  padding: 1rem 1.125rem;
  background: var(--moss-600);
}

.page-about .reach-list dt {
  margin-bottom: .35rem;
  font-family: var(--font-label);
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(251, 249, 245, .7);
}

.page-about .reach-list dd {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--paper-50);
  word-break: break-word;
}

/* ---------- 滚动显现 ---------- */

.js-reveal .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 120ms ease-out, transform 120ms ease-out;
}

.js-reveal .page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 40rem) {
  .page-about .reach-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 48rem) {
  .page-about .principle-list li {
    grid-template-columns: 13rem minmax(0, 1fr);
    column-gap: 1.75rem;
    align-items: baseline;
  }

  .page-about .source-list article {
    grid-template-columns: 9.5rem minmax(0, 1fr);
    column-gap: 1.75rem;
    align-items: baseline;
  }

  .page-about .tl-item {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    column-gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .tl-item::before {
    top: 1.7rem;
  }
}

@media (min-width: 56rem) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 62rem) {
  .page-about .ch-grid {
    grid-template-columns: 5.5rem minmax(0, 1fr) 17rem;
    column-gap: clamp(2rem, 4vw, 3.25rem);
    align-items: start;
  }

  .page-about .ch-aside {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
    padding-top: .35rem;
  }
}

/* ---------- 降低动态偏好 ---------- */

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

  .js-reveal .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}