.page-about {
  background: var(--paper);
  color: var(--deep-ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .shell {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: 20px;
}

/* ========== 首屏框景 ========== */
.page-about .about-hero {
  padding: 32px 0 24px;
  background: linear-gradient(180deg, var(--paper) 0%, var(--white) 100%);
}

.page-about .about-hero-frame {
  position: relative;
  border: 2px solid var(--deep-ink);
  background: var(--white);
  padding: 24px 20px 32px;
  box-shadow: 6px 6px 0 var(--paper-deep);
}

.page-about .about-hero-frame::before {
  content: attr(data-frame-label);
  position: absolute;
  top: -11px;
  left: 24px;
  background: var(--deep-ink);
  color: var(--white);
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 2px;
  padding: 3px 10px;
  text-transform: uppercase;
}

.page-about .about-hero-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--neutral-mist);
  padding-bottom: 12px;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
}

.page-about .breadcrumb a {
  color: var(--muted-text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--accent);
}

.page-about .breadcrumb-sep {
  color: var(--neutral-mist);
}

.page-about .breadcrumb-current {
  color: var(--deep-ink);
  font-weight: 600;
}

.page-about .about-hero-code {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--muted-text);
}

.page-about .about-hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.page-about .about-hero-main {
  position: relative;
}

.page-about .about-hero-title {
  font-family: var(--font-heading);
  font-size: 36px;
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: 1px;
  margin: 8px 0 16px;
  color: var(--deep-ink);
}

.page-about .about-hero-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted-text);
  max-width: 560px;
  border-left: 3px solid var(--accent);
  padding-left: 16px;
}

.page-about .about-hero-aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  border-left: 1px solid var(--neutral-mist);
  padding-left: 16px;
}

.page-about .vertical-label {
  writing-mode: vertical-rl;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 4px;
  color: var(--muted-text);
  text-transform: uppercase;
  height: 104px;
}

.page-about .coordinate {
  font-family: var(--font-label);
  font-size: 12px;
  color: var(--muted-text);
  letter-spacing: 1px;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--neutral-mist);
  border: 1px solid var(--neutral-mist);
}

.page-about .about-stat {
  background: var(--paper);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat-num {
  font-family: var(--font-heading);
  font-size: 28px;
  line-height: 1.1;
  color: var(--deep-ink);
  font-weight: 700;
}

.page-about .about-stat-label {
  font-size: 12px;
  color: var(--muted-text);
  letter-spacing: 0.5px;
}

/* ========== 章节索引 ========== */
.page-about .about-index {
  padding: 8px 0 32px;
}

.page-about .about-index-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--deep-ink);
}

.page-about .about-index-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  text-decoration: none;
  color: var(--deep-ink);
  border-left: 1px solid var(--neutral-mist);
  font-size: 13px;
  font-weight: 500;
  transition: background 0.2s ease;
}

.page-about .about-index-item:first-child {
  border-left: none;
  padding-left: 0;
}

.page-about .about-index-item:hover {
  background: var(--accent-light);
}

.page-about .about-index-num {
  font-family: var(--font-label);
  font-size: 11px;
  color: var(--accent);
  font-weight: 700;
}

.page-about .about-index-text {
  white-space: nowrap;
}

/* ========== 通用 section 样式 ========== */
.page-about .about-section {
  padding: 48px 0;
}

.page-about .about-section-header {
  margin-bottom: 32px;
  position: relative;
}

.page-about .about-section-title {
  font-family: var(--font-heading);
  font-size: 30px;
  line-height: 1.2;
  margin: 8px 0 8px;
  color: var(--deep-ink);
  font-weight: 700;
  letter-spacing: 1px;
}

.page-about .about-section-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted-text);
  max-width: 640px;
}

/* ========== 品牌档案 ========== */
.page-about .about-profile {
  background: var(--paper);
  border-top: 1px solid var(--neutral-mist);
  border-bottom: 1px solid var(--neutral-mist);
}

.page-about .about-profile-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-profile-card {
  padding: 24px 20px;
  position: relative;
  background: var(--white);
}

.page-about .about-profile-card .coordinate {
  display: inline-block;
  margin-bottom: 16px;
}

.page-about .about-profile-name {
  font-family: var(--font-heading);
  font-size: 32px;
  line-height: 1.2;
  margin: 0 0 4px;
  color: var(--deep-ink);
  font-weight: 700;
}

.page-about .about-profile-role {
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.page-about .about-profile-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-text);
  margin-bottom: 20px;
}

.page-about .about-profile-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-profile-tags .chip {
  border: 1px solid var(--neutral-mist);
  padding: 6px 14px;
  font-size: 12px;
  color: var(--deep-ink);
  background: var(--paper);
}

.page-about .about-profile-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-profile-pillar {
  border-left: 2px solid var(--deep-ink);
  padding: 16px 18px;
  background: var(--paper-deep);
  position: relative;
  transition: border-color 0.2s ease;
}

.page-about .about-profile-pillar:hover {
  border-left-color: var(--accent);
}

.page-about .about-pillar-index {
  font-family: var(--font-label);
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
  display: block;
  margin-bottom: 6px;
}

.page-about .about-pillar-title {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--deep-ink);
}

.page-about .about-pillar-text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted-text);
}

/* ========== 发展历程 ========== */
.page-about .about-milestones {
  background: var(--white);
  border-bottom: 1px solid var(--neutral-mist);
}

.page-about .about-timeline {
  position: relative;
  margin-left: 0;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--neutral-mist);
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 32px 28px;
}

.page-about .about-timeline-year {
  margin-bottom: 8px;
}

.page-about .about-timeline-year-num {
  font-family: var(--font-heading);
  font-size: 40px;
  line-height: 1;
  color: var(--deep-ink);
  font-weight: 700;
  opacity: 0.9;
  -webkit-text-stroke: 1px var(--deep-ink);
  -webkit-text-fill-color: transparent;
  background: linear-gradient(90deg, var(--deep-ink) 0%, var(--deep-ink) 70%, transparent 70%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-timeline-card {
  position: relative;
  padding: 20px 18px;
  border: 1px solid var(--neutral-mist);
  background: var(--paper);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-timeline-card:hover {
  transform: translateY(-2px);
  border-color: var(--deep-ink);
}

.page-about .about-timeline-dot {
  position: absolute;
  left: -27px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--accent);
}

.page-about .about-timeline-title {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--deep-ink);
}

.page-about .about-timeline-desc {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted-text);
  margin-bottom: 12px;
}

.page-about .about-timeline-tag {
  display: inline-block;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--accent);
  border: 1px solid var(--accent-light);
  padding: 4px 10px;
}

.page-about .about-timeline-image {
  padding-left: 28px;
  margin-bottom: 32px;
}

.page-about .about-timeline-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--neutral-mist);
  display: block;
}

.page-about .about-image-caption {
  font-family: var(--font-label);
  font-size: 11px;
  color: var(--muted-text);
  letter-spacing: 1px;
  margin-top: 8px;
  text-align: right;
}

/* ========== 产品矩阵 ========== */
.page-about .about-product {
  background: var(--paper);
  border-bottom: 1px solid var(--neutral-mist);
}

.page-about .about-product-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-product-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-product-card {
  padding: 22px 20px;
  border: 1px solid var(--neutral-mist);
  background: var(--white);
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-product-card:hover {
  transform: translateY(-3px);
  box-shadow: 4px 4px 0 var(--paper-deep);
}

.page-about .about-product-index {
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
  font-weight: 700;
}

.page-about .about-product-title {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--deep-ink);
  line-height: 1.4;
}

.page-about .about-product-desc {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted-text);
  margin-bottom: 14px;
}

.page-about .about-product-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--deep-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
  transition: color 0.2s ease;
}

.page-about .about-product-link span {
  color: var(--accent);
  transition: transform 0.2s ease;
}

.page-about .about-product-link:hover {
  color: var(--accent);
}

.page-about .about-product-link:hover span {
  transform: translateX(4px);
}

.page-about .about-product-visual {
  position: relative;
}

.page-about .about-product-visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--deep-ink);
  display: block;
}

.page-about .about-product-visual .vertical-label {
  position: absolute;
  right: 10px;
  bottom: 10px;
  height: 120px;
  color: var(--white);
  background: var(--deep-ink);
  padding: 8px 4px;
  writing-mode: vertical-rl;
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 3px;
}

/* ========== 数据与安全 ========== */
.page-about .about-data {
  background: var(--deep-ink);
  color: var(--white);
  border-bottom: 1px solid var(--neutral-mist);
}

.page-about .about-data .index-label {
  color: var(--accent-light);
}

.page-about .about-data .about-section-title {
  color: var(--white);
}

.page-about .about-data .about-section-desc {
  color: var(--neutral-mist);
}

.page-about .about-data-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-data-radar {
  background: var(--paper);
  padding: 16px;
  border: 1px solid var(--neutral-mist);
}

.page-about .about-radar-svg {
  width: 100%;
  height: auto;
  max-height: 380px;
  display: block;
}

.page-about .about-radar-label {
  font-size: 12px;
  fill: var(--deep-ink);
  font-weight: 600;
}

.page-about .about-radar-value {
  font-size: 11px;
  fill: var(--accent);
  font-weight: 700;
}

.page-about .about-data-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-data-feature {
  background: var(--reduced-ink);
  border-left: 3px solid var(--accent);
  padding: 14px 16px;
}

.page-about .about-data-feature-label {
  display: block;
  font-family: var(--font-label);
  font-size: 12px;
  color: var(--accent-light);
  letter-spacing: 1px;
  font-weight: 600;
  margin-bottom: 6px;
}

.page-about .about-data-feature p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--neutral-mist);
  margin: 0;
}

.page-about .about-data-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--neutral-mist);
  margin-top: 28px;
  display: block;
}

/* ========== 本地体育文化 ========== */
.page-about .about-culture {
  background: var(--paper);
  padding-bottom: 64px;
}

.page-about .about-culture-card {
  border: 2px solid var(--deep-ink);
  background: var(--white);
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 28px 20px;
  position: relative;
  box-shadow: 6px 6px 0 var(--paper-deep);
}

.page-about .about-culture-left {
  border-right: 1px solid var(--neutral-mist);
  padding-right: 0;
  border-right: none;
}

.page-about .about-culture-title {
  font-size: 28px;
  margin-top: 8px;
}

.page-about .about-culture-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-text);
  margin-bottom: 20px;
}

.page-about .about-culture-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-bottom: 20px;
}

.page-about .about-culture-item {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--neutral-mist);
  padding: 10px 12px;
  background: var(--paper);
}

.page-about .about-culture-num {
  font-family: var(--font-label);
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
}

.page-about .about-culture-item-text {
  font-size: 13px;
  font-weight: 500;
  color: var(--deep-ink);
  margin: 0;
}

.page-about .about-culture .button {
  display: inline-block;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-culture .button-outline {
  border: 2px solid var(--deep-ink);
  color: var(--deep-ink);
  background: transparent;
}

.page-about .about-culture .button-outline:hover {
  background: var(--deep-ink);
  color: var(--white);
}

/* ========== 动效 ========== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

.page-about [data-reveal][data-reveal-delay="1"] {
  transition-delay: 0.06s;
}
.page-about [data-reveal][data-reveal-delay="2"] {
  transition-delay: 0.12s;
}
.page-about [data-reveal][data-reveal-delay="3"] {
  transition-delay: 0.18s;
}
.page-about [data-reveal][data-reveal-delay="4"] {
  transition-delay: 0.24s;
}
.page-about [data-reveal][data-reveal-delay="5"] {
  transition-delay: 0.3s;
}

/* ========== 桌面端增强 ========== */
@media (min-width: 768px) {
  .page-about .shell {
    padding-inline: 32px;
  }

  .page-about .about-hero {
    padding-top: 48px;
  }

  .page-about .about-hero-frame {
    padding: 32px 32px 40px;
  }

  .page-about .about-hero-title {
    font-size: 48px;
  }

  .page-about .about-hero-layout {
    grid-template-columns: 1fr 200px;
    gap: 40px;
  }

  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-stat {
    padding: 20px 18px;
  }

  .page-about .about-stat-num {
    font-size: 34px;
  }

  .page-about .about-index-rail {
    flex-wrap: nowrap;
    justify-content: space-between;
  }

  .page-about .about-section {
    padding: 64px 0;
  }

  .page-about .about-section-title {
    font-size: 36px;
  }

  .page-about .about-profile-layout {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .page-about .about-profile-card {
    padding: 32px 28px;
  }

  .page-about .about-profile-meta {
    grid-template-columns: 1fr;
    align-content: start;
  }

  .page-about .about-timeline {
    margin-left: 0;
  }

  .page-about .about-timeline::before {
    left: 180px;
  }

  .page-about .about-timeline-item {
    display: grid;
    grid-template-columns: 168px 1fr;
    gap: 32px;
    padding: 0 0 40px 0;
  }

  .page-about .about-timeline-year {
    text-align: right;
    padding-right: 24px;
    margin-bottom: 0;
  }

  .page-about .about-timeline-year-num {
    font-size: 48px;
    writing-mode: vertical-rl;
    height: 120px;
    letter-spacing: 6px;
  }

  .page-about .about-timeline-dot {
    left: -7px;
    top: 24px;
  }

  .page-about .about-timeline-image {
    padding-left: 200px;
  }

  .page-about .about-product-layout {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-product-cards {
    gap: 24px;
  }

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

  .page-about .about-data-layout {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 40px;
  }

  .page-about .about-data-radar {
    padding: 24px;
  }

  .page-about .about-data-info {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .page-about .about-data-image img {
    margin-top: 36px;
  }

  .page-about .about-culture-card {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 40px;
    padding: 40px 36px;
  }

  .page-about .about-culture-left {
    border-right: 1px solid var(--neutral-mist);
    padding-right: 32px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-hero-title {
    font-size: 56px;
  }

  .page-about .about-hero-desc {
    font-size: 16px;
  }

  .page-about .about-section-title {
    font-size: 40px;
  }

  .page-about .about-profile-card {
    padding: 40px 36px;
  }

  .page-about .about-profile-name {
    font-size: 36px;
  }

  .page-about .about-timeline::before {
    left: 240px;
  }

  .page-about .about-timeline-item {
    grid-template-columns: 220px 1fr;
    gap: 40px;
  }

  .page-about .about-timeline-image {
    padding-left: 260px;
  }

  .page-about .about-timeline-desc {
    font-size: 14px;
  }

  .page-about .about-product-desc {
    font-size: 14px;
  }

  .page-about .about-data-feature p {
    font-size: 14px;
  }
}

@media (min-width: 1440px) {
  .page-about .shell {
    padding-inline: 48px;
  }
}

/* ========== 减少动效 ========== */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-timeline-card:hover,
  .page-about .about-product-card:hover {
    transform: none;
  }

  .page-about .about-profile-pillar:hover,
  .page-about .about-index-item:hover {
    transition: none;
  }
}