.page-about {
  --about-green-soft: rgba(0, 232, 143, 0.08);
  --about-orange-soft: rgba(255, 122, 41, 0.1);
  --about-note-bg: rgba(123, 144, 169, 0.08);
  position: relative;
  overflow-x: hidden;
  background: var(--bg-primary);
  color: var(--text-body);
}

/* ===== Hero 区 ===== */
.page-about .about-hero {
  position: relative;
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--line-grid);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(40, 67, 110, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(40, 67, 110, 0.35) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: linear-gradient(to bottom, #000, transparent 85%);
          mask-image: linear-gradient(to bottom, #000, transparent 85%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 140px;
  height: 100%;
  background: linear-gradient(to bottom, var(--accent-speed), transparent 70%);
  clip-path: polygon(100% 0, 60% 100%, 100% 100%);
  opacity: 0.08;
  pointer-events: none;
}
.page-about .about-watermark {
  position: absolute;
  top: var(--space-lg);
  right: 10px;
  z-index: 0;
  font-family: var(--font-numeric);
  font-size: clamp(110px, 20vw, 260px);
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(0, 232, 143, 0.24);
  pointer-events: none;
  user-select: none;
}
.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}
.page-about .breadcrumb {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--line-grid);
}
.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}
.page-about .about-hero-kicker {
  margin-top: var(--space-lg);
}
.page-about .about-hero-title {
  margin: var(--space-md) 0 var(--space-sm);
  font-family: var(--font-heading);
  font-size: clamp(30px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-primary);
  transform: skewX(-2deg);
}
.page-about .about-hero-title span {
  display: block;
  margin-top: var(--space-sm);
  color: var(--accent-speed);
  font-size: 0.58em;
}
.page-about .about-hero-title span::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 4px;
  margin-right: var(--space-sm);
  background: var(--accent-alert);
  transform: skewX(-20deg);
  vertical-align: middle;
}
.page-about .about-hero-lead {
  max-width: 640px;
  margin-top: var(--space-sm);
  font-size: 17px;
  color: var(--text-body);
  border-left: 3px solid var(--accent-alert);
  padding-left: var(--space-md);
}
.page-about .about-hero-fig {
  margin-top: var(--space-lg);
  background: var(--bg-surface);
  border-left: 1px solid var(--line-grid);
  border-bottom: 1px solid var(--line-grid);
  clip-path: polygon(0 0, calc(100% - 48px) 0, 100% 48px, 100% 100%, 0 100%);
  overflow: hidden;
}
.page-about .about-hero-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 主体布局 ===== */
.page-about .about-layout {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
}
.page-about .about-main {
  min-width: 0;
}

/* ===== 档案目录 ===== */
.page-about .about-aside {
  margin-bottom: var(--space-lg);
}
.page-about .about-aside-inner {
  background: var(--bg-surface);
  border: 1px solid var(--line-grid);
  padding: var(--space-md);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}
.page-about .about-aside-heading {
  margin: 0 0 var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--line-grid);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.page-about .about-aside-list {
  list-style: none;
  margin: 0;
  padding: 0 0 var(--space-xs);
  display: flex;
  gap: var(--space-xs);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-aside-list::-webkit-scrollbar {
  height: 4px;
}
.page-about .about-aside-list::-webkit-scrollbar-thumb {
  background: var(--line-grid);
}
.page-about .about-aside-list li {
  flex: 0 0 auto;
  border: 1px solid var(--line-grid);
  background: var(--bg-primary);
}
.page-about .about-aside-list a {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  color: var(--text-body);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.page-about .about-aside-list a:hover {
  color: var(--accent-speed);
}
.page-about .about-aside-list a:focus-visible {
  outline: 2px solid var(--accent-alert);
  outline-offset: -1px;
}
.page-about .about-aside-note {
  margin-top: var(--space-sm);
  padding: var(--space-sm);
  background: var(--about-green-soft);
  border-left: 2px solid var(--accent-speed);
  color: var(--text-muted);
  font-size: 13px;
}

/* ===== 章节通用 ===== */
.page-about .about-section {
  scroll-margin-top: 150px;
  margin-bottom: var(--space-xl);
}
.page-about .about-section + .about-section {
  border-top: 1px solid var(--line-grid);
  padding-top: var(--space-xl);
}
.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--line-grid);
}
.page-about .about-section-index {
  font-family: var(--font-numeric);
  font-size: 44px;
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent-speed);
  white-space: nowrap;
}
.page-about .about-section-head .kicker {
  margin-bottom: 4px;
}
.page-about .about-section-head .section-title {
  margin: var(--space-xs) 0 0;
}
.page-about .about-section-lead {
  max-width: 720px;
  font-size: 17px;
  color: var(--text-body);
}

/* ===== 时间轴：第1轮到第47轮 ===== */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: var(--space-lg) 0 0;
  padding: 0;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-speed), var(--line-grid) 70%);
}
.page-about .about-timeline-item {
  position: relative;
  padding-left: 44px;
  padding-bottom: var(--space-lg);
}
.page-about .about-timeline-item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline-dot {
  position: absolute;
  left: 0;
  top: 12px;
  width: 18px;
  height: 18px;
  background: var(--bg-primary);
  border: 2px solid var(--accent-speed);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--about-green-soft);
}
.page-about .about-timeline-item-current .about-timeline-dot {
  background: var(--accent-alert);
  border-color: var(--accent-alert);
  box-shadow: 0 0 0 4px var(--about-orange-soft);
}
.page-about .about-timeline-card {
  background: var(--bg-surface);
  border: 1px solid var(--line-grid);
  padding: var(--space-md) var(--space-lg);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.page-about .about-timeline-card:hover {
  border-color: var(--accent-speed);
  box-shadow: var(--shadow-card);
}
.page-about .about-timeline-item-current .about-timeline-card {
  border-color: var(--accent-alert);
}
.page-about .about-timeline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}
.page-about .about-timeline-tag {
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.page-about .about-timeline-card h3 {
  margin: 0 0 var(--space-xs);
  color: var(--text-primary);
  font-size: 18px;
  transform: skewX(-2deg);
}
.page-about .about-timeline-desc {
  margin: 0 0 var(--space-sm);
  color: var(--text-body);
  font-size: 14px;
}
.page-about .about-timeline-details {
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px dashed var(--line-grid);
}
.page-about .about-timeline-details summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  list-style: none;
  color: var(--accent-speed);
  font-size: 13px;
  font-weight: 700;
  transition: color 0.15s ease;
}
.page-about .about-timeline-details summary::-webkit-details-marker {
  display: none;
}
.page-about .about-timeline-details summary:hover {
  color: var(--text-primary);
}
.page-about .about-timeline-details summary::after {
  content: "+";
  font-family: var(--font-numeric);
  font-size: 16px;
  line-height: 1;
  transition: transform 0.15s ease;
}
.page-about .about-timeline-details[open] summary::after {
  transform: rotate(45deg);
}
.page-about .about-timeline-body {
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: rgba(10, 22, 51, 0.6);
  border-left: 2px solid var(--accent-alert);
}
.page-about .about-timeline-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

/* ===== 收藏功能卡 ===== */
.page-about .about-feature-card {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: var(--space-xl);
  background: var(--bg-surface);
  border: 1px solid var(--line-grid);
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 0 100%);
  overflow: hidden;
}
.page-about .about-feature-media {
  aspect-ratio: 3 / 2;
  background: var(--bg-primary);
  overflow: hidden;
}
.page-about .about-feature-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .about-feature-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-md);
}
.page-about .about-feature-body .kicker {
  margin-bottom: 0;
}
.page-about .about-feature-body h3 {
  margin: 0;
  color: var(--text-primary);
  font-size: 22px;
  transform: skewX(-2deg);
}
.page-about .about-feature-body p:not(.kicker) {
  margin: 0;
  color: var(--text-body);
  font-size: 14px;
}
.page-about .about-feature-body .btn {
  align-self: flex-start;
  margin-top: var(--space-xs);
}

/* ===== 更多链接 ===== */
.page-about .about-more-link {
  margin-top: var(--space-md);
  text-align: right;
}
.page-about .about-more-link a {
  color: var(--accent-speed);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}
.page-about .about-more-link a:hover {
  text-decoration: underline;
}

/* ===== 观赛节奏由来 ===== */
.page-about .about-philosophy-grid {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}
.page-about .about-philosophy-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--line-grid);
  padding: var(--space-lg) var(--space-md) var(--space-md);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  overflow: hidden;
}
.page-about .about-philosophy-num {
  display: block;
  margin-bottom: var(--space-sm);
  font-family: var(--font-numeric);
  font-size: 32px;
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent-alert);
}
.page-about .about-philosophy-card h3 {
  margin: 0 0 var(--space-xs);
  color: var(--text-primary);
  font-size: 18px;
  transform: skewX(-2deg);
}
.page-about .about-philosophy-card p {
  margin: 0;
  color: var(--text-body);
  font-size: 14px;
}
.page-about .about-side-note {
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: var(--about-orange-soft);
  border-left: 3px solid var(--accent-alert);
  font-size: 14px;
}
.page-about .about-side-note p {
  margin: 0;
}

/* ===== 平台服务范围 ===== */
.page-about .about-coverage-grid {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}
.page-about .about-coverage-card {
  background: var(--bg-surface);
  border: 1px solid var(--line-grid);
  padding: var(--space-md);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}
.page-about .about-coverage-card h3 {
  margin: 0 0 var(--space-xs);
  color: var(--text-primary);
  font-size: 17px;
  transform: skewX(-2deg);
}
.page-about .about-coverage-card p {
  margin: 0 0 var(--space-sm);
  color: var(--text-muted);
  font-size: 14px;
}
.page-about .about-coverage-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}
.page-about .about-coverage-card li {
  padding: 2px 10px;
  background: var(--about-green-soft);
  border: 1px solid rgba(0, 232, 143, 0.25);
  color: var(--text-body);
  font-size: 13px;
}
.page-about .about-coverage-svg {
  display: block;
  width: 100%;
  height: auto;
  margin-top: var(--space-sm);
  background: var(--bg-primary);
  border: 1px solid var(--line-grid);
  font-family: var(--font-body);
}
.page-about .about-svg-key {
  list-style: none;
  margin: var(--space-sm) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-xs);
}
.page-about .about-svg-key li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-primary);
  border: 1px solid var(--line-grid);
  color: var(--text-body);
  font-size: 14px;
}
.page-about .about-key-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
}
.page-about .about-key-dot-green {
  background: var(--accent-speed);
}
.page-about .about-key-dot-orange {
  background: var(--accent-alert);
}
.page-about .about-key-dot-light {
  background: var(--text-primary);
}

/* ===== 团队与数据能力 ===== */
.page-about .about-team-grid {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-md);
}
.page-about .about-team-list {
  list-style: none;
  margin: var(--space-md) 0;
  padding: 0;
}
.page-about .about-team-list li {
  position: relative;
  margin-bottom: var(--space-sm);
  padding-left: var(--space-md);
  color: var(--text-body);
  font-size: 15px;
}
.page-about .about-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--accent-speed);
  transform: rotate(45deg);
}
.page-about .about-team-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin: var(--space-md) 0 var(--space-lg);
}
.page-about .about-stat {
  padding: var(--space-sm) var(--space-xs);
  background: var(--bg-surface);
  border: 1px solid var(--line-grid);
  text-align: center;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}
.page-about .about-stat-num {
  display: block;
  font-family: var(--font-numeric);
  font-size: 26px;
  font-weight: 900;
  color: var(--accent-speed);
}
.page-about .about-stat-label {
  display: block;
  margin-top: 2px;
  color: var(--text-muted);
  font-size: 12px;
}
.page-about .about-team-copy .btn {
  display: inline-block;
}
.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

/* ===== 品牌色卡实验室 ===== */
.page-about .about-color-grid {
  list-style: none;
  margin: var(--space-lg) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}
.page-about .about-color-chip {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 2px;
  min-height: 112px;
  padding: var(--space-sm);
  background: var(--chip-bg, var(--bg-surface));
  border: 1px solid var(--line-grid);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.page-about .about-color-chip:hover {
  border-color: var(--accent-speed);
  transform: translateY(-2px);
}
.page-about .about-color-value {
  align-self: flex-start;
  padding: 2px 6px;
  background: rgba(10, 22, 51, 0.75);
  color: var(--text-primary);
  font-family: var(--font-numeric);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.page-about .about-color-name {
  align-self: flex-start;
  padding: 2px 6px;
  background: rgba(10, 22, 51, 0.6);
  color: var(--text-primary);
  font-size: 12px;
}

/* ===== 响应式增强 ===== */
@media (max-width: 767px) {
  .page-about .about-hero-fig img {
    aspect-ratio: 16 / 9;
    object-fit: cover;
  }
}

@media (min-width: 600px) {
  .page-about .about-svg-key {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 720px) {
  .page-about .about-color-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 768px) {
  .page-about .about-philosophy-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-coverage-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-coverage-card-wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-feature-card {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-feature-media {
    aspect-ratio: auto;
    height: 100%;
    min-height: 260px;
  }
  .page-about .about-feature-body {
    padding: var(--space-xl) var(--space-lg);
  }
  .page-about .about-team-grid {
    grid-template-columns: 1.1fr 1fr;
    align-items: center;
    gap: var(--space-xl);
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    gap: clamp(48px, 6vw, 88px);
    align-items: start;
  }
  .page-about .about-aside {
    position: sticky;
    top: 130px;
    margin-bottom: 0;
  }
  .page-about .about-aside-list {
    flex-direction: column;
    gap: 0;
    overflow-x: visible;
    padding-bottom: 0;
  }
  .page-about .about-aside-list li {
    flex: none;
    border: 0;
    background: transparent;
    border-bottom: 1px solid rgba(40, 67, 110, 0.5);
  }
  .page-about .about-aside-list li:last-child {
    border-bottom: 0;
  }
  .page-about .about-aside-list a {
    padding: var(--space-sm) 0;
    white-space: normal;
  }
}

.page-about {
  --chip-bg: transparent;
}