.page-about {
  --local-accent: #ff6b35;
  --local-volt: #c8f542;
  --local-link: #00e5ff;
  --local-bg: #0a1128;
  --local-bg-2: #1a2340;
  --local-bg-3: #131d38;
  --local-text: #d0d7e5;
  --local-muted: #5a6b8c;
  --local-white: #f8fafc;
  --local-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  --local-display: 'Barlow Condensed', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --local-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', sans-serif;

  background:
    radial-gradient(900px 480px at 90% 0%, rgba(0, 229, 255, 0.09), transparent 55%),
    radial-gradient(700px 520px at 0% 18%, rgba(255, 107, 53, 0.08), transparent 50%),
    #0a1128;
  color: var(--local-text);
  font-family: var(--local-body);
  line-height: 1.6;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--local-volt);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-about .about-hero {
  position: relative;
  padding: 88px var(--gutter) 36px;
  border-bottom: 1px solid rgba(90, 107, 140, 0.2);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(118deg, rgba(255, 107, 53, 0.14) 0%, transparent 34%),
    linear-gradient(310deg, rgba(0, 229, 255, 0.1) 0%, transparent 30%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "PROFILE / CN";
  position: absolute;
  left: 50%;
  top: 56px;
  transform: translateX(-50%);
  font-family: var(--local-mono);
  font-size: clamp(10rem, 22vw, 22rem);
  font-weight: 900;
  letter-spacing: -0.06em;
  color: rgba(255, 255, 255, 0.025);
  pointer-events: none;
  white-space: nowrap;
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-w);
  margin: 0 auto;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--local-mono);
  font-size: 0.78rem;
  color: var(--local-muted);
  margin-bottom: 34px;
}

.page-about .breadcrumb a {
  color: var(--local-link);
  text-decoration: none;
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: 40px;
  position: relative;
}

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

.page-about .about-eyebrow {
  display: block;
  font-family: var(--local-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--local-volt);
  margin-bottom: 18px;
}

.page-about .about-hero-title {
  margin: 0;
  font-family: var(--local-display);
  font-weight: 900;
  font-size: clamp(2.8rem, 7vw, 5.6rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--local-white);
}

.page-about .about-hero-title::after {
  content: "";
  display: block;
  width: 96px;
  height: 6px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--local-accent) 0 60%, var(--local-volt) 60% 100%);
  border-radius: 999px;
}

.page-about .about-hero-subtitle {
  margin: 16px 0 22px;
  font-family: var(--local-mono);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--local-accent);
}

.page-about .about-hero-lead {
  max-width: 580px;
  margin: 0 0 30px;
  font-size: 0.97rem;
  color: var(--local-text);
}

.page-about .about-hero-meta {
  display: grid;
  gap: 10px;
  align-content: end;
}

.page-about .about-hero-meta-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0 16px;
  background: rgba(26, 35, 64, 0.66);
  border-left: 3px solid var(--local-accent);
  border-radius: 0 12px 12px 0;
  padding: 14px 18px;
}

.page-about .about-hero-meta-item:first-child {
  border-left-color: var(--local-volt);
}

.page-about .about-hero-meta-item:last-child {
  border-left-color: var(--local-link);
}

.page-about .about-hero-meta-idx {
  grid-column: 1 / -1;
  font-family: var(--local-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--local-muted);
  margin-bottom: 4px;
}

.page-about .about-hero-meta-item strong {
  font-family: var(--local-display);
  font-weight: 900;
  font-size: 2.4rem;
  line-height: 1;
  color: var(--local-white);
}

.page-about .about-hero-meta-item small {
  font-size: 0.76rem;
  color: var(--local-muted);
  text-align: right;
}

.page-about .about-layout {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gutter) 64px;
}

.page-about .about-toc {
  display: flex;
  gap: 8px;
  padding: 24px 0 8px;
  margin-bottom: 12px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc-title {
  display: none;
  font-family: var(--local-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--local-muted);
}

.page-about .about-toc-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(26, 35, 64, 0.5);
  border: 1px solid rgba(90, 107, 140, 0.2);
  color: var(--local-text);
  font-family: var(--local-mono);
  font-size: 0.76rem;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-toc-link:hover,
.page-about .about-toc-link:focus-visible {
  border-color: var(--local-volt);
  background: rgba(200, 245, 66, 0.08);
  color: var(--local-volt);
}

.page-about .about-toc-no {
  font-size: 0.66rem;
  color: var(--local-muted);
}

.page-about .about-section {
  position: relative;
  padding-top: 28px;
  scroll-margin-top: 130px;
  margin-bottom: 60px;
}

.page-about .about-section-tab {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(90deg, var(--local-accent), #ff8f5f);
  color: #0a1128;
  font-family: var(--local-mono);
  font-weight: 800;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 8px 18px 8px 14px;
  margin-left: 12px;
  border-radius: 10px 10px 0 0;
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .about-section:nth-child(even) .about-section-tab {
  background: linear-gradient(90deg, var(--local-link), rgba(0, 229, 255, 0.7));
}

.page-about .about-tab-code {
  background: rgba(10, 17, 40, 0.18);
  color: var(--local-white);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 0.68rem;
}

.page-about .about-section-body {
  position: relative;
  background:
    radial-gradient(600px 200px at 90% 0%, rgba(200, 245, 66, 0.05), transparent 60%),
    linear-gradient(135deg, rgba(26, 35, 64, 0.78), rgba(19, 29, 56, 0.92));
  border: 1px solid rgba(208, 215, 229, 0.1);
  border-radius: 0 18px 18px 18px;
  padding: 30px 26px;
}

.page-about .about-section:nth-child(even) .about-section-body {
  background:
    radial-gradient(600px 200px at 90% 0%, rgba(0, 229, 255, 0.06), transparent 60%),
    linear-gradient(135deg, rgba(19, 29, 56, 0.85), rgba(26, 35, 64, 0.9));
}

.page-about .about-section-body::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 38%;
  width: 42px;
  height: 2px;
  background: var(--local-volt);
  opacity: 0.7;
}

.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: 26px;
}

.page-about .section-index {
  font-family: var(--local-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--local-accent);
  background: rgba(255, 107, 53, 0.1);
  padding: 4px 10px;
  border-radius: 6px;
}

.page-about .about-section:nth-child(even) .section-index {
  background: rgba(0, 229, 255, 0.1);
  color: var(--local-link);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--local-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1.12;
  color: var(--local-white);
}

.page-about .about-idea-grid {
  display: grid;
  gap: 30px;
}

.page-about .about-idea-copy p {
  margin: 0 0 16px;
  font-size: 0.97rem;
  line-height: 1.7;
}

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

.page-about .about-principle-stack {
  display: grid;
  gap: 12px;
}

.page-about .about-principle {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: rgba(10, 17, 40, 0.5);
  border-left: 3px solid var(--local-accent);
  border-radius: 10px;
  padding: 16px;
}

.page-about .about-principle:nth-child(2) {
  border-left-color: var(--local-volt);
}

.page-about .about-principle:nth-child(3) {
  border-left-color: var(--local-link);
}

.page-about .about-principle-no {
  flex-shrink: 0;
  font-family: var(--local-mono);
  font-size: 0.72rem;
  color: var(--local-volt);
  background: rgba(200, 245, 66, 0.1);
  padding: 4px 8px;
  border-radius: 6px;
}

.page-about .about-principle strong {
  display: block;
  font-family: var(--local-display);
  font-weight: 900;
  font-size: 1.18rem;
  line-height: 1.2;
  color: var(--local-white);
}

.page-about .about-principle small {
  display: block;
  margin-top: 4px;
  font-size: 0.84rem;
  color: var(--local-muted);
}

.page-about .about-milestone-wrap {
  display: grid;
  gap: 28px;
}

.page-about .media {
  display: block;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--local-bg-3);
}

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

.page-about .media--16x9 {
  aspect-ratio: 16 / 9;
}

.page-about .media-tagline {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  font-family: var(--local-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--local-white);
  background: rgba(10, 17, 40, 0.72);
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid rgba(200, 245, 66, 0.25);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 14px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--local-accent), var(--local-volt), transparent);
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 16px 40px;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 20px;
  height: 20px;
  background: var(--local-bg);
  border: 3px solid var(--local-accent);
  border-radius: 50%;
  z-index: 1;
}

.page-about .about-timeline-item:nth-child(2)::before {
  border-color: var(--local-volt);
}

.page-about .about-timeline-item:nth-child(3)::before {
  border-color: var(--local-link);
}

.page-about .about-timeline-item:nth-child(4)::before {
  border-color: var(--local-volt);
}

.page-about .about-timeline-item details {
  background: rgba(19, 29, 56, 0.5);
  border: 1px solid rgba(208, 215, 229, 0.08);
  border-radius: 12px;
  padding: 14px 16px;
}

.page-about .about-timeline-item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline-item summary::after {
  content: "+";
  margin-left: auto;
  flex-shrink: 0;
  font-family: var(--local-mono);
  font-size: 1rem;
  color: var(--local-volt);
}

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

.page-about .about-timeline-phase {
  font-family: var(--local-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--local-accent);
  background: rgba(255, 107, 53, 0.13);
  padding: 3px 8px;
  border-radius: 5px;
  white-space: nowrap;
}

.page-about .about-timeline-item summary strong {
  flex: 1;
  min-width: 180px;
  font-family: var(--local-display);
  font-weight: 800;
  font-size: 1.12rem;
  line-height: 1.2;
  color: var(--local-white);
}

.page-about .about-timeline-item details p {
  margin: 12px 0 4px;
  padding-top: 12px;
  border-top: 1px dashed rgba(90, 107, 140, 0.4);
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--local-text);
}

.page-about .about-data-media {
  aspect-ratio: 1200 / 700;
  margin-bottom: 24px;
}

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

.page-about .about-data-bars {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: var(--radius);
  background-image:
    linear-gradient(rgba(90, 107, 140, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(90, 107, 140, 0.09) 1px, transparent 1px);
  background-size: 28px 28px;
  margin-bottom: 22px;
}

.page-about .about-bar-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  align-items: center;
  gap: 10px;
}

.page-about .about-bar-label {
  font-family: var(--local-mono);
  font-size: 0.74rem;
  color: var(--local-muted);
  text-align: right;
}

.page-about .about-bar-track {
  display: flex;
  align-items: stretch;
  height: 30px;
  background: rgba(90, 107, 140, 0.2);
  border-radius: 999px;
  overflow: hidden;
}

.page-about .about-bar-fill {
  display: flex;
  align-items: center;
  width: 88%;
  padding: 0 12px;
  border-radius: 999px;
  font-family: var(--local-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: #0a1128;
  white-space: nowrap;
  transform-origin: left center;
  animation: page-about-bar-rise 1s var(--ease) both;
}

.page-about .about-bar-fill--90 {
  width: 90%;
  background: linear-gradient(90deg, #ff6b35, #ff8f5f);
}

.page-about .about-bar-fill--12 {
  width: 74%;
  background: linear-gradient(90deg, #c8f542, #9fe884);
}

.page-about .about-bar-fill--10 {
  width: 58%;
  background: linear-gradient(90deg, #00e5ff, #00c2ff);
}

.page-about .about-bar-fill--50 {
  width: 84%;
  background: linear-gradient(90deg, #7b6cff, #b8a8ff);
}

@keyframes page-about-bar-rise {
  from {
    transform: scaleX(0.1);
    opacity: 0.6;
  }
  to {
    transform: scaleX(1);
    opacity: 1;
  }
}

.page-about .about-data-note {
  margin: 0;
  max-width: 72ch;
  padding-left: 16px;
  border-left: 3px solid var(--local-accent);
  font-size: 0.88rem;
  color: var(--local-muted);
}

.page-about .about-club-grid {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-club-media {
  aspect-ratio: 3 / 2;
  order: -1;
}

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

.page-about .about-club-copy p {
  margin: 0 0 16px;
  line-height: 1.7;
}

.page-about .about-feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-feature-list li {
  position: relative;
  padding: 8px 0 8px 24px;
  border-bottom: 1px dashed rgba(90, 107, 140, 0.25);
  font-size: 0.92rem;
  color: var(--local-text);
}

.page-about .about-feature-list li:last-child {
  border-bottom: 0;
}

.page-about .about-feature-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--local-volt);
  font-family: var(--local-mono);
}

.page-about .about-navrecord-layout {
  display: grid;
  gap: 26px;
}

.page-about .about-navrecord-copy p {
  margin: 0 0 16px;
  line-height: 1.7;
}

.page-about .about-path-card {
  position: relative;
  background: rgba(10, 17, 40, 0.52);
  border: 1px solid rgba(200, 245, 66, 0.18);
  border-radius: 14px;
  padding: 24px 20px;
  align-self: stretch;
}

.page-about .about-path-card::before,
.page-about .about-path-card::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 2px solid var(--local-volt);
  opacity: 0.7;
}

.page-about .about-path-card::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-radius: 4px 0 0 0;
}

.page-about .about-path-card::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
  border-radius: 0 0 4px 0;
}

.page-about .about-path-label {
  display: block;
  margin-bottom: 18px;
  font-family: var(--local-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--local-volt);
}

.page-about .about-path-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--local-mono);
  font-size: 0.82rem;
}

.page-about .about-path-flow span {
  background: var(--local-bg-2);
  border: 1px solid rgba(208, 215, 229, 0.12);
  padding: 6px 10px;
  border-radius: 8px;
  color: var(--local-text);
}

.page-about .about-path-flow b {
  font-family: var(--local-mono);
  color: var(--local-accent);
}

.page-about .about-path-card small {
  display: block;
  margin-top: 18px;
  font-size: 0.76rem;
  color: var(--local-muted);
}

.page-about .about-scale-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-stat {
  text-align: center;
  background: rgba(26, 35, 64, 0.55);
  border: 1px solid rgba(90, 107, 140, 0.2);
  border-radius: 14px;
  padding: 22px 10px;
  position: relative;
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--local-volt);
  box-shadow: 0 0 12px rgba(200, 245, 66, 0.6);
}

.page-about .about-stat:nth-child(2)::after {
  background: var(--local-accent);
  box-shadow: 0 0 12px rgba(255, 107, 53, 0.6);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--local-display);
  font-weight: 900;
  font-size: 3rem;
  line-height: 1;
  color: var(--local-white);
}

.page-about .about-stat span {
  display: block;
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--local-muted);
}

.page-about .about-honor-panel {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.page-about .about-honor-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(135deg, rgba(200, 245, 66, 0.08), transparent);
  border: 1px solid rgba(200, 245, 66, 0.16);
  border-radius: 12px;
  padding: 16px;
}

.page-about .about-honor-icon {
  flex-shrink: 0;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--local-volt);
}

.page-about .about-honor-item strong {
  display: block;
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--local-white);
}

.page-about .about-honor-item small {
  display: block;
  margin-top: 4px;
  font-size: 0.76rem;
  color: var(--local-muted);
}

.page-about .about-scale-note {
  margin: 18px 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--local-muted);
}

.page-about .about-scale-note a {
  color: var(--local-link);
  text-decoration: none;
}

.page-about .about-scale-note a:hover {
  color: var(--local-volt);
  text-decoration: underline;
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 100px;
    padding-bottom: 48px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-idea-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 36px;
    align-items: start;
  }

  .page-about .about-club-grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 32px;
  }

  .page-about .about-club-media {
    order: 0;
  }

  .page-about .about-navrecord-layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 32px;
    align-items: center;
  }

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

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

  .page-about .about-bar-row {
    grid-template-columns: 140px 1fr;
    gap: 14px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 52px;
    padding-top: 28px;
    padding-bottom: 96px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 150px;
    flex-direction: column;
    align-items: stretch;
    padding: 0;
    margin: 0;
    border-left: 2px solid rgba(90, 107, 140, 0.35);
    overflow: visible;
  }

  .page-about .about-toc-title {
    display: block;
    padding: 4px 12px 20px 20px;
  }

  .page-about .about-toc-link {
    border-radius: 0;
    background: transparent;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -2px;
    padding: 10px 12px 10px 20px;
    font-size: 0.82rem;
  }

  .page-about .about-toc-link:hover,
  .page-about .about-toc-link:focus-visible {
    background: transparent;
    border-left-color: var(--local-volt);
    color: var(--local-volt);
  }

  .page-about .about-toc-no {
    font-size: 0.7rem;
  }

  .page-about .about-section {
    margin-bottom: 84px;
  }

  .page-about .about-section-body {
    padding: 36px 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar-fill {
    animation: none;
  }
}