/* ===== 196体育APP官网 · 品牌概况 ===== */
.page-about {
  background: var(--background-off-white);
  color: var(--text-charcoal);
  font-family: var(--font-body);
  line-height: 1.6;
}

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

/* --- 首屏封面 --- */
.page-about__hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 72vh;
  overflow: hidden;
  background: var(--primary-dark-green);
  color: #fff;
}

.page-about__hero-media {
  position: absolute;
  inset: 0;
}

.page-about__hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
}

.page-about__hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 4rem 1.25rem 3.5rem;
}

.page-about__breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 2.5rem;
}

.page-about__breadcrumb a {
  color: var(--accent-pale-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.page-about__breadcrumb a:hover {
  color: var(--accent-gold);
  border-bottom-color: var(--accent-gold);
}

.page-about__breadcrumb-sep {
  color: rgba(255, 255, 255, 0.35);
}

.page-about__hero-num {
  position: absolute;
  top: 1.5rem;
  right: 1rem;
  font-family: var(--font-display);
  font-size: clamp(6rem, 16vw, 14rem);
  font-weight: 200;
  line-height: 1;
  color: rgba(212, 175, 55, 0.22);
  z-index: 0;
  letter-spacing: -0.02em;
}

.page-about__hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 6rem);
  font-weight: 600;
  line-height: 1.04;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  max-width: 16ch;
}

.page-about__hero-h1-main {
  display: block;
}

.page-about__hero-h1-sub {
  display: block;
  font-size: 0.52em;
  font-weight: 300;
  line-height: 1.2;
  color: var(--accent-gold);
  text-transform: none;
  letter-spacing: 0.02em;
  max-width: 26ch;
  margin-top: 0.9rem;
  padding-left: 1.25rem;
  border-left: 4px solid var(--accent-gold);
}

.page-about__hero-lead {
  max-width: 64ch;
  font-size: 1.05rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.84);
  margin: 2rem 0 0;
}

.page-about__hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.75rem;
}

.page-about__hero-tags span {
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 0.28rem 0.9rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.72);
  text-transform: uppercase;
}

/* --- 通用章节栅格 --- */
.page-about__section {
  padding: 4rem 0;
}

.page-about__section-grid {
  display: grid;
  gap: 2rem;
}

/* --- 章节索引（档案侧签） --- */
.page-about__index {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding-bottom: 1rem;
  border-bottom: 4px solid var(--accent-gold);
}

.page-about__index-num {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 200;
  line-height: 1;
  color: var(--primary-deep-green);
  letter-spacing: -0.02em;
}

.page-about__index-text {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-muted-gray);
}

/* --- 正文内容 --- */
.page-about__content h2,
.page-about__content h3,
.page-about__content h4 {
  font-family: var(--font-display);
  text-transform: uppercase;
}

.page-about__content h2 {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 500;
  line-height: 1.1;
  margin: 0 0 1.25rem;
  color: var(--primary-deep-green);
}

.page-about__content p {
  margin: 0 0 1.25rem;
  color: var(--text-charcoal);
}

.page-about__lede {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-muted-gray) !important;
  margin-bottom: 2.25rem !important;
  max-width: 68ch;
}

/* --- 品牌缘起引语 --- */
.page-about__origin {
  background: #fff;
}

.page-about__quote {
  margin: 2.5rem 0;
  padding: 1.5rem 2rem;
  border-left: 6px solid var(--accent-gold);
  background: var(--background-off-white);
  box-shadow: inset 0 1px 0 rgba(7, 42, 31, 0.06);
}

.page-about__quote p {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.6rem);
  font-weight: 500;
  line-height: 1.18;
  color: var(--primary-deep-green);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0;
}

.page-about__quote cite {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.85rem;
  font-style: normal;
  letter-spacing: 0.12em;
  color: var(--text-muted-gray);
}

/* --- 数据规模区 --- */
.page-about__scope {
  background: var(--tertiary-pale-green);
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 3rem;
}

.page-about__stat {
  border: 4px solid var(--primary-deep-green);
  background: #fff;
  box-shadow: var(--shadow-hard);
  padding: 1.4rem 1rem 1.2rem;
  text-align: center;
}

.page-about__stat-num {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 4.5rem);
  font-weight: 500;
  line-height: 1;
  color: var(--primary-deep-green);
  font-variant-numeric: tabular-nums;
}

.page-about__stat-unit {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--accent-gold);
  margin-left: 0.1rem;
}

.page-about__stat-label {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted-gray);
}

.page-about__subheading {
  font-size: 1.35rem;
  font-weight: 500;
  margin: 0 0 1.25rem;
  color: var(--primary-deep-green);
  display: inline-block;
  border-bottom: 3px solid var(--accent-gold);
  padding-bottom: 0.25rem;
}

.page-about__sports {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about__sport {
  border: 4px solid var(--primary-deep-green);
  background: #fff;
  padding: 1.25rem 1.5rem;
  box-shadow: 4px 4px 0 rgba(7, 42, 31, 0.14);
  transition: box-shadow var(--transition-base), transform var(--transition-fast);
}

.page-about__sport:hover {
  box-shadow: 8px 8px 0 rgba(7, 42, 31, 0.18);
  transform: translateY(-2px);
}

.page-about__sport h4 {
  font-size: 1.35rem;
  margin: 0 0 0.5rem;
  color: var(--primary-deep-green);
  display: inline-block;
  border-bottom: 3px solid var(--accent-gold);
}

.page-about__sport p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted-gray);
}

.page-about__footnote {
  font-size: 0.88rem;
  color: var(--text-muted-gray);
  border-top: 1px solid rgba(7, 42, 31, 0.18);
  padding-top: 1.25rem;
  margin-top: 2.5rem !important;
}

.page-about__footnote a {
  color: var(--primary-deep-green);
  font-weight: 600;
  text-underline-offset: 3px;
}

/* --- 团队与组织 --- */
.page-about__team-section {
  background: var(--background-off-white);
}

.page-about__team-figure {
  margin: 2rem 0;
  border: 4px solid var(--primary-deep-green);
  box-shadow: var(--shadow-hard);
  background: var(--tertiary-pale-green);
}

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

.page-about__team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about__team-card {
  border-top: 4px solid var(--primary-deep-green);
  padding: 1.25rem 0.25rem 0.25rem;
  background: transparent;
}

.page-about__team-tag {
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: var(--primary-deep-green);
  color: #fff;
  padding: 0.28rem 0.9rem;
  border: 2px solid var(--primary-deep-green);
  display: inline-block;
  margin-bottom: 0.75rem;
}

.page-about__team-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-muted-gray);
}

/* --- 发展历程（深色段落） --- */
.page-about__history {
  background: var(--primary-deep-green);
  color: #fff;
}

.page-about__history .page-about__content h2 {
  color: var(--accent-gold);
}

.page-about__history .page-about__content p:not(.page-about__lede):not(.page-about__footnote) {
  color: rgba(255, 255, 255, 0.78);
}

.page-about__history .page-about__lede {
  color: rgba(255, 255, 255, 0.68) !important;
}

.page-about__history .page-about__index-num {
  color: var(--accent-gold);
}

.page-about__history .page-about__index-text {
  color: rgba(255, 255, 255, 0.5);
}

.page-about__history-figure {
  margin: 2rem 0 2.75rem;
  border: 4px solid rgba(212, 175, 55, 0.6);
  background: rgba(255, 255, 255, 0.04);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.25);
}

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

.page-about__history-figure figcaption {
  padding: 0.7rem 1rem;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.6);
  border-top: 2px solid rgba(212, 175, 55, 0.32);
}

/* --- 时间轴 --- */
.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: var(--accent-gold);
  opacity: 0.4;
}

.page-about__timeline-item {
  position: relative;
  padding: 0 0 2.25rem 2.5rem;
}

.page-about__timeline-dot {
  position: absolute;
  left: 0;
  top: 14px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--accent-gold);
  border: 4px solid var(--primary-dark-green);
  box-shadow: 0 0 0 2px var(--accent-gold);
}

.page-about__timeline-card {
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.05);
  padding: 1.4rem 1.5rem;
  transition: border-color var(--transition-base), background var(--transition-base), transform var(--transition-base);
}

.page-about__timeline-item:hover .page-about__timeline-card {
  border-color: var(--accent-gold);
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(3px);
}

.page-about__timeline-year {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.22em;
  color: var(--accent-gold);
  display: block;
  margin-bottom: 0.45rem;
}

.page-about__timeline-card h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
  color: #fff;
}

.page-about__timeline-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.75);
}

/* --- 资质荣誉 --- */
.page-about__awards-section {
  background: #fff;
}

.page-about__award-list {
  display: grid;
  gap: 1.5rem;
}

.page-about__award-item {
  border: 4px solid var(--primary-deep-green);
  box-shadow: var(--shadow-hard);
  background: #fff;
  transition: box-shadow var(--transition-base);
}

.page-about__award-item[open] {
  box-shadow: 12px 12px 0 rgba(7, 42, 31, 0.22);
}

.page-about__award-item summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  cursor: pointer;
  padding: 1.25rem 1.5rem;
}

.page-about__award-item summary::-webkit-details-marker {
  display: none;
}

.page-about__award-item summary::after {
  content: "+";
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--primary-deep-green);
  line-height: 1;
  transition: transform var(--transition-fast);
}

.page-about__award-item[open] summary::after {
  content: "−";
}

.page-about__award-name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  text-transform: uppercase;
  color: var(--primary-deep-green);
  letter-spacing: 0.02em;
}

.page-about__award-type,
.page-about__award-year {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted-gray);
  background: var(--background-off-white);
  border: 2px solid var(--primary-deep-green);
  padding: 0.2rem 0.7rem;
  white-space: nowrap;
}

.page-about__award-body {
  padding: 1rem 1.5rem 1.5rem;
  border-top: 2px solid var(--accent-pale-gold);
}

.page-about__award-body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-muted-gray);
}

/* --- 合作伙伴生态 --- */
.page-about__partners-section {
  background: var(--background-off-white);
}

.page-about__partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.page-about__partner-card {
  position: relative;
  border: 4px solid var(--primary-deep-green);
  background: #fff;
  box-shadow: var(--shadow-hard);
  padding: 1.75rem 1.5rem 1.5rem;
}

.page-about__partner-count {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--accent-gold);
  color: var(--primary-dark-green);
  border: 4px solid var(--primary-deep-green);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.page-about__partner-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
  color: var(--primary-deep-green);
}

.page-about__partner-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-muted-gray);
}

/* --- 底部继续探索 --- */
.page-about__next {
  background: var(--accent-gold);
  padding: 4rem 0;
}

.page-about__next-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: flex-start;
}

.page-about__next-heading h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  text-transform: uppercase;
  color: var(--primary-dark-green);
  margin: 0;
  font-weight: 600;
}

.page-about__next-heading p {
  color: var(--primary-deep-green);
  font-size: 1rem;
  margin: 0.5rem 0 0;
  letter-spacing: 0.04em;
}

.page-about__next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about__next-btn {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  padding: 0.8rem 1.75rem;
  border: 4px solid var(--primary-deep-green);
  background: var(--primary-deep-green);
  color: #fff;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.18);
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-base);
}

.page-about__next-btn--ghost {
  background: transparent;
  color: var(--primary-deep-green);
}

.page-about__next-btn:hover {
  background: var(--primary-dark-green);
  color: var(--accent-pale-gold);
  transform: translateY(-2px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.2);
}

/* --- 焦点可见 --- */
.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about .page-about__next-btn:focus-visible {
  outline: 4px solid var(--accent-gold);
  outline-offset: 2px;
}

/* ===== 桌面端断点 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    min-height: 88vh;
  }

  .page-about__hero-inner {
    padding: 5rem 2rem 5rem 2rem;
  }

  .page-about__hero-num {
    top: 2.5rem;
    right: 2rem;
  }

  .page-about__hero-tags {
    margin-top: 2.25rem;
  }

  .page-about__section {
    padding: 5.5rem 0;
  }

  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }

  .page-about__sports {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }

  .page-about__partner-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__next-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 900px) {
  .page-about__section-grid {
    grid-template-columns: 200px 1fr;
    gap: 4rem;
  }

  .page-about__index {
    position: sticky;
    top: 120px;
    align-self: flex-start;
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
    padding-bottom: 0;
    padding-right: 1.75rem;
    border-bottom: 0;
    border-right: 4px solid var(--accent-gold);
  }

  .page-about__index-num {
    font-size: clamp(3.5rem, 6vw, 5.5rem);
  }

  .page-about__history .page-about__timeline {
    padding-left: 1rem;
  }

  .page-about__next {
    padding: 5rem 0;
  }
}

/* --- 动效降级 --- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}