.page-about {
  --pa-gold: #FFB347;
  --pa-orange: #FF6B35;
  --pa-highlight: #FFD980;
  --pa-bg-panel: #122A4A;
  --pa-bg-hover: #1B3A5C;
  --pa-bg-accent: #2E5F8E;
  --pa-muted: #A9BFD4;
  --pa-deep: #0B1E3B;
  --pa-radius-lg: 32px;
  --pa-radius-md: 20px;
  --pa-radius-sm: 12px;
  --pa-radius-pill: 999px;
  position: relative;
  background-color: var(--pa-deep);
  color: #FFFFFF;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  overflow-x: hidden;
}

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

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

.page-about a {
  color: inherit;
  text-decoration: none;
}

.page-about .index-label {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--pa-muted);
}

.page-about .section-kicker {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--pa-gold);
  margin: 0 0 16px;
  font-weight: 400;
}

.page-about .pa-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  padding: 64px var(--container-pad);
  position: relative;
  scroll-margin-top: 100px;
}

.page-about .pa-section__index {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}

.page-about .pa-section__num {
  font-size: 72px;
  font-weight: 200;
  line-height: 0.9;
  color: rgba(255, 179, 71, 0.14);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  letter-spacing: -0.04em;
}

.page-about .pa-section__title {
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 200;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 0 0 24px;
  color: #FFFFFF;
}

.page-about .pa-section__main {
  min-width: 0;
}

/* ===== HERO ===== */
.page-about .pa-hero {
  position: relative;
  padding: 100px var(--container-pad) 60px;
  min-height: 720px;
  display: flex;
  align-items: center;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(46, 95, 142, 0.25) 0%, transparent 55%),
    radial-gradient(ellipse at 15% 90%, rgba(255, 107, 53, 0.08) 0%, transparent 45%),
    var(--pa-deep);
  overflow: hidden;
}

.page-about .pa-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 420px;
  height: 420px;
  background: linear-gradient(135deg, rgba(255, 179, 71, 0.12), rgba(255, 107, 53, 0.04));
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

.page-about .pa-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.page-about .pa-hero__side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 24px;
}

.page-about .pa-hero__side h1 {
  font-size: clamp(42px, 8vw, 92px);
  font-weight: 200;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 0;
  color: #FFFFFF;
}

.page-about .pa-hero__side h1 em {
  display: block;
  font-style: normal;
  font-size: clamp(24px, 4vw, 44px);
  font-weight: 300;
  color: var(--pa-gold);
  margin-top: 12px;
  letter-spacing: -0.02em;
}

.page-about .pa-hero__lead {
  font-size: 16px;
  line-height: 1.9;
  color: var(--pa-muted);
  max-width: 560px;
  margin: 0;
}

.page-about .pa-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.page-about .pa-meta-chip {
  display: inline-block;
  padding: 8px 18px;
  border-radius: var(--pa-radius-pill);
  background: rgba(18, 42, 74, 0.8);
  border: 1px solid rgba(255, 179, 71, 0.22);
  font-size: 13px;
  color: var(--pa-highlight);
  font-weight: 400;
  backdrop-filter: blur(6px);
}

.page-about .pa-hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  position: relative;
}

.page-about .pa-orbit {
  position: relative;
  width: 280px;
  height: 280px;
}

.page-about .pa-orbit__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255, 179, 71, 0.18);
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  animation: pa-orbit-spin 14s linear infinite;
}

.page-about .pa-orbit__ring--1 {
  width: 100%;
  height: 100%;
  border-color: rgba(46, 95, 142, 0.5);
  border-top-color: rgba(255, 179, 71, 0.7);
  animation-duration: 9s;
}

.page-about .pa-orbit__ring--2 {
  width: 74%;
  height: 74%;
  border-style: dashed;
  border-color: rgba(169, 191, 212, 0.3);
  animation-direction: reverse;
  animation-duration: 14s;
}

.page-about .pa-orbit__ring--3 {
  width: 48%;
  height: 48%;
  border-color: rgba(255, 179, 71, 0.35);
  border-bottom-color: rgba(255, 107, 53, 0.8);
  animation-duration: 6s;
}

.page-about .pa-orbit__core {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 18px;
  font-weight: 300;
  letter-spacing: 0.18em;
  color: #FFFFFF;
  background: linear-gradient(135deg, var(--pa-bg-panel), var(--pa-deep));
  width: 110px;
  height: 110px;
  border-radius: var(--pa-radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 40px rgba(255, 179, 71, 0.14);
  border: 1px solid rgba(255, 179, 71, 0.3);
}

.page-about .pa-orbit__dot {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--pa-gold);
  box-shadow: 0 0 12px rgba(255, 179, 71, 0.8);
}

.page-about .pa-orbit__dot--1 {
  top: 22%;
  right: 12%;
  animation: pa-dot-pulse 2.4s ease-in-out infinite;
}

.page-about .pa-orbit__dot--2 {
  bottom: 18%;
  left: 10%;
  background: var(--pa-orange);
  box-shadow: 0 0 12px rgba(255, 107, 53, 0.8);
  animation: pa-dot-pulse 2.4s ease-in-out 0.8s infinite;
}

.page-about .pa-orbit__dot--3 {
  top: 50%;
  left: 4%;
  background: var(--pa-highlight);
  animation: pa-dot-pulse 2.4s ease-in-out 1.4s infinite;
}

@keyframes pa-orbit-spin {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes pa-dot-pulse {
  0%, 100% { opacity: 0.5; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.2); }
}

.page-about .pa-hero__scrollbar {
  position: absolute;
  bottom: 30px;
  left: var(--container-pad);
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .pa-hero__scrollbar-label {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.24em;
  color: rgba(169, 191, 212, 0.6);
}

.page-about .pa-hero__scrollbar-line {
  display: block;
  width: 80px;
  height: 1px;
  background: linear-gradient(90deg, var(--pa-gold), transparent);
  position: relative;
  overflow: hidden;
}

.page-about .pa-hero__scrollbar-line::after {
  content: "";
  position: absolute;
  top: 0;
  left: -40px;
  width: 40px;
  height: 100%;
  background: rgba(255, 255, 255, 0.6);
  animation: pa-scroll-sweep 2.8s ease-in-out infinite;
}

@keyframes pa-scroll-sweep {
  0% { transform: translateX(0); opacity: 0; }
  30% { opacity: 1; }
  100% { transform: translateX(160px); opacity: 0; }
}

/* ===== TOC ===== */
.page-about .pa-toc {
  padding: 18px var(--container-pad);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(10, 25, 48, 0.6);
  backdrop-filter: blur(10px);
  position: sticky;
  top: var(--header-h, 68px);
  z-index: 20;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .pa-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 28px;
  min-width: max-content;
}

.page-about .pa-toc__list a {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--pa-muted);
  padding: 8px 0;
  position: relative;
  transition: color 0.3s ease;
  white-space: nowrap;
}

.page-about .pa-toc__list a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--pa-gold), var(--pa-orange));
  transition: width 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about .pa-toc__list a:hover {
  color: var(--pa-highlight);
}

.page-about .pa-toc__list a:hover::after {
  width: 100%;
}

/* ===== OVERVIEW ===== */
.page-about .pa-overview__main {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.page-about .pa-overview__text {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .pa-overview__text p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--pa-muted);
  margin: 0;
}

.page-about .pa-overview__facts {
  background: linear-gradient(145deg, var(--pa-bg-panel), rgba(18, 42, 74, 0.6));
  border-radius: var(--pa-radius-md);
  padding: 28px;
  border: 1px solid rgba(255, 179, 71, 0.1);
  position: relative;
  overflow: hidden;
}

.page-about .pa-overview__facts::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--pa-gold), var(--pa-orange));
  border-radius: 0 4px 4px 0;
}

.page-about .pa-fact-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .pa-fact-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .pa-fact-item dt {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--pa-gold);
}

.page-about .pa-fact-item dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #FFFFFF;
}

.page-about .pa-overview__quote {
  margin-top: 12px;
  border-left: 3px solid var(--pa-orange);
  padding: 16px 24px;
  background: rgba(18, 42, 74, 0.4);
  border-radius: 0 var(--pa-radius-sm) var(--pa-radius-sm) 0;
}

.page-about .pa-overview__quote blockquote {
  margin: 0;
  font-size: 16px;
  font-weight: 300;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
}

/* ===== TIMELINE ===== */
.page-about .pa-milestones__main {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .pa-milestones__note {
  font-size: 15px;
  line-height: 1.8;
  color: var(--pa-muted);
  max-width: 700px;
  margin: 0 0 12px;
}

.page-about .pa-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-about .pa-timeline::before {
  content: "";
  position: absolute;
  top: 30px;
  bottom: 30px;
  left: 88px;
  width: 2px;
  background: linear-gradient(180deg, rgba(255, 179, 71, 0.5), rgba(46, 95, 142, 0.3), rgba(255, 107, 53, 0.4));
  border-radius: 2px;
}

.page-about .pa-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding-left: 0;
}

.page-about .pa-timeline__node {
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 2;
}

.page-about .pa-timeline__year {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--pa-gold);
  white-space: nowrap;
  min-width: 52px;
  background: var(--pa-deep);
  padding: 4px 0;
  display: inline-block;
}

.page-about .pa-timeline__marker {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--pa-deep);
  border: 3px solid var(--pa-gold);
  box-shadow: 0 0 0 4px rgba(255, 179, 71, 0.12), 0 0 18px rgba(255, 179, 71, 0.25);
  flex-shrink: 0;
  margin-left: 38px;
}

.page-about .pa-timeline__item--now .pa-timeline__marker {
  background: linear-gradient(135deg, var(--pa-gold), var(--pa-orange));
  border-color: var(--pa-highlight);
  box-shadow: 0 0 0 6px rgba(255, 179, 71, 0.15), 0 0 24px rgba(255, 107, 53, 0.4);
}

.page-about .pa-timeline__card {
  background: linear-gradient(145deg, rgba(18, 42, 74, 0.9), rgba(11, 30, 59, 0.9));
  border-radius: var(--pa-radius-md);
  border: 1px solid rgba(255, 255, 255, 0.07);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .pa-timeline__card:hover {
  border-color: rgba(255, 179, 71, 0.3);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.page-about .pa-timeline__card summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  user-select: none;
  transition: background-color 0.3s ease;
}

.page-about .pa-timeline__card summary::-webkit-details-marker {
  display: none;
}

.page-about .pa-timeline__card summary:hover {
  background-color: rgba(27, 58, 92, 0.4);
}

.page-about .pa-timeline__tag {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--pa-highlight);
  background: rgba(255, 179, 71, 0.1);
  border: 1px solid rgba(255, 179, 71, 0.2);
  border-radius: var(--pa-radius-pill);
  padding: 4px 12px;
  width: fit-content;
}

.page-about .pa-timeline__headline {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.5;
  color: #FFFFFF;
  padding-right: 32px;
}

.page-about .pa-timeline__toggle {
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid rgba(255, 179, 71, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.page-about .pa-timeline__toggle::before {
  content: "";
  width: 8px;
  height: 1px;
  background: var(--pa-gold);
  display: block;
}

.page-about .pa-timeline__toggle::after {
  content: "";
  width: 1px;
  height: 8px;
  background: var(--pa-gold);
  display: block;
  position: absolute;
  transition: opacity 0.2s ease, transform 0.3s ease;
}

.page-about .pa-timeline__card[open] .pa-timeline__toggle::after {
  opacity: 0;
  transform: rotate(90deg);
}

.page-about .pa-timeline__card[open] .pa-timeline__toggle {
  background-color: rgba(255, 179, 71, 0.1);
}

.page-about .pa-timeline__body {
  padding: 0 22px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 0;
}

.page-about .pa-timeline__body p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--pa-muted);
  margin: 0;
  padding-top: 16px;
}

.page-about .pa-timeline__body p + p {
  margin-top: 10px;
}

.page-about .pa-milestones__visual {
  margin: 18px 0 0;
  border-radius: var(--pa-radius-md);
  overflow: hidden;
  background: var(--pa-bg-panel);
  border: 1px solid rgba(255, 255, 255, 0.07);
  position: relative;
}

.page-about .pa-milestones__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1000 / 800;
  max-height: 500px;
}

/* ===== DATA RECORDS ===== */
.page-about .pa-data__main {
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: relative;
}

.page-about .pa-data__main::before {
  content: "90";
  position: absolute;
  right: -10px;
  top: -20px;
  font-size: 140px;
  font-weight: 200;
  line-height: 1;
  color: rgba(255, 179, 71, 0.04);
  pointer-events: none;
  letter-spacing: -0.06em;
  z-index: 0;
}

.page-about .pa-data__intro {
  font-size: 15px;
  line-height: 1.85;
  color: var(--pa-muted);
  max-width: 680px;
  margin: 0;
  position: relative;
  z-index: 1;
}

.page-about .pa-data__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 12px 0 0;
  position: relative;
  z-index: 1;
}

.page-about .pa-data-card {
  background: linear-gradient(160deg, var(--pa-bg-panel), var(--pa-deep));
  border-radius: var(--pa-radius-md);
  padding: 28px 24px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .pa-data-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 179, 71, 0.25);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
}

.page-about .pa-data-card__num {
  font-size: clamp(48px, 6vw, 68px);
  font-weight: 200;
  line-height: 1;
  color: var(--pa-gold);
  letter-spacing: -0.03em;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .pa-data-card__num em {
  font-style: normal;
  font-size: 20px;
  font-weight: 300;
  color: var(--pa-highlight);
}

.page-about .pa-data-card__label {
  font-size: 13px;
  color: var(--pa-muted);
  letter-spacing: 0.06em;
}

.page-about .pa-data__chart {
  background: linear-gradient(145deg, rgba(18, 42, 74, 0.85), rgba(11, 30, 59, 0.95));
  border-radius: var(--pa-radius-md);
  padding: 28px 22px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  position: relative;
  z-index: 1;
}

.page-about .pa-data__chart-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .pa-data__chart-title {
  font-size: 17px;
  font-weight: 400;
  margin: 0;
  color: #FFFFFF;
}

.page-about .pa-chart {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  height: 220px;
  padding-top: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 0;
}

.page-about .pa-chart__bar {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex: 1;
  height: 100%;
  position: relative;
  border-radius: var(--pa-radius-pill) var(--pa-radius-pill) 0 0;
  background: linear-gradient(180deg, rgba(255, 179, 71, 0.9), rgba(255, 107, 53, 0.65));
  min-height: 40px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.page-about .pa-chart__bar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: rgba(255, 217, 128, 0.9);
  border-radius: 0 0 4px 4px;
}

.page-about .pa-chart__bar:hover {
  transform: scaleY(1.02);
  transform-origin: bottom;
}

.page-about .pa-chart__bar i {
  position: absolute;
  top: -30px;
  font-style: normal;
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  color: var(--pa-highlight);
}

.page-about .pa-chart__bar span {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.8);
  padding: 6px 0 4px;
  background: rgba(11, 30, 59, 0.7);
  width: 100%;
  text-align: center;
}

.page-about .pa-chart__bar--1 {
  height: var(--bar-height, 39%);
  background: linear-gradient(180deg, rgba(46, 95, 142, 0.7), rgba(46, 95, 142, 0.4));
}

.page-about .pa-chart__bar--1::before {
  background: rgba(169, 191, 212, 0.7);
}

.page-about .pa-chart__bar--1 i {
  color: var(--pa-muted);
}

.page-about .pa-chart__bar--2 {
  height: var(--bar-height, 52%);
}

.page-about .pa-chart__bar--3 {
  height: var(--bar-height, 70%);
}

.page-about .pa-chart__bar--4 {
  height: var(--bar-height, 100%);
  background: linear-gradient(180deg, var(--pa-highlight), var(--pa-orange));
}

.page-about .pa-data__chart-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--pa-muted);
  margin: 16px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 14px;
}

.page-about .pa-data__records {
  background: rgba(18, 42, 74, 0.6);
  border-radius: var(--pa-radius-md);
  padding: 26px 24px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  position: relative;
  z-index: 1;
}

.page-about .pa-data__records-title {
  font-size: 17px;
  font-weight: 400;
  margin: 0 0 18px;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .pa-data__records-title::before {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, var(--pa-gold), transparent);
  flex-shrink: 0;
}

.page-about .pa-data__record-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .pa-data__record-list li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--pa-muted);
  padding-left: 28px;
  position: relative;
}

.page-about .pa-data__record-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid var(--pa-gold);
  background: radial-gradient(circle, var(--pa-gold) 0%, var(--pa-gold) 35%, transparent 36%);
  opacity: 0.8;
}

.page-about .pa-data__visual {
  margin: 8px 0 0;
  border-radius: var(--pa-radius-md);
  overflow: hidden;
  background: var(--pa-bg-panel);
  border: 1px solid rgba(255, 255, 255, 0.07);
  position: relative;
  z-index: 1;
}

.page-about .pa-data__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 900 / 600;
  max-height: 420px;
}

/* ===== CERTIFICATIONS ===== */
.page-about .pa-cert__main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about .pa-cert__intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--pa-muted);
  max-width: 680px;
  margin: 0;
}

.page-about .pa-cert__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 8px;
}

.page-about .pa-cert-card {
  background: linear-gradient(145deg, rgba(18, 42, 74, 0.9), rgba(11, 30, 59, 0.9));
  border-radius: var(--pa-radius-md);
  border: 1px solid rgba(255, 255, 255, 0.07);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .pa-cert-card:hover {
  border-color: rgba(255, 179, 71, 0.28);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.3);
}

.page-about .pa-cert-card summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  user-select: none;
  transition: background-color 0.3s ease;
}

.page-about .pa-cert-card summary::-webkit-details-marker {
  display: none;
}

.page-about .pa-cert-card summary:hover {
  background-color: rgba(27, 58, 92, 0.35);
}

.page-about .pa-cert-card__icon {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(255, 179, 71, 0.18), rgba(255, 107, 53, 0.12));
  border: 1px solid rgba(255, 179, 71, 0.25);
  color: var(--pa-highlight);
  flex-shrink: 0;
}

.page-about .pa-cert-card__body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-width: 0;
}

.page-about .pa-cert-card__title {
  font-size: 16px;
  font-weight: 400;
  color: #FFFFFF;
  line-height: 1.45;
}

.page-about .pa-cert-card__tag {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--pa-gold);
  opacity: 0.85;
}

.page-about .pa-cert-card__arrow {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid rgba(255, 179, 71, 0.3);
  position: relative;
  flex-shrink: 0;
  transition: background-color 0.3s ease;
}

.page-about .pa-cert-card__arrow::before,
.page-about .pa-cert-card__arrow::after {
  content: "";
  position: absolute;
  background: var(--pa-gold);
  left: 50%;
  top: 50%;
}

.page-about .pa-cert-card__arrow::before {
  width: 10px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.page-about .pa-cert-card__arrow::after {
  width: 1px;
  height: 10px;
  transform: translate(-50%, -50%);
  transition: opacity 0.2s ease;
}

.page-about .pa-cert-card[open] .pa-cert-card__arrow::after {
  opacity: 0;
}

.page-about .pa-cert-card[open] .pa-cert-card__arrow {
  background-color: rgba(255, 179, 71, 0.1);
}

.page-about .pa-cert-card__detail {
  padding: 0 20px 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.page-about .pa-cert-card__detail p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--pa-muted);
  margin: 0;
  padding-top: 16px;
}

.page-about .pa-cert__visual {
  margin: 10px 0 0;
  border-radius: var(--pa-radius-md);
  overflow: hidden;
  background: var(--pa-bg-panel);
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.page-about .pa-cert__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 600 / 400;
  max-height: 360px;
}

/* ===== CROSSLINK ===== */
.page-about .pa-crosslink {
  padding: 60px var(--container-pad) 80px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background: linear-gradient(180deg, rgba(11, 30, 59, 0.4), rgba(11, 30, 59, 0.9));
}

.page-about .pa-crosslink__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

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

.page-about .pa-crosslink__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 24px;
  border-radius: var(--pa-radius-md);
  background: rgba(18, 42, 74, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.page-about .pa-crosslink__item:hover {
  background: rgba(27, 58, 92, 0.5);
  border-color: rgba(255, 179, 71, 0.25);
  transform: translateY(-2px);
}

.page-about .pa-crosslink__index {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--pa-gold);
}

.page-about .pa-crosslink__item strong {
  font-size: 17px;
  font-weight: 400;
  color: #FFFFFF;
}

.page-about .pa-crosslink__item span:last-child {
  font-size: 13px;
  line-height: 1.6;
  color: var(--pa-muted);
}

/* ===== REVEAL ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .pa-orbit__ring,
  .page-about .pa-orbit__dot,
  .page-about .pa-hero__scrollbar-line::after {
    animation: none;
  }
}

/* ===== MEDIA QUERIES ===== */
@media (min-width: 768px) {
  .page-about .pa-section {
    grid-template-columns: 180px 1fr;
    gap: 48px;
    padding-top: 90px;
    padding-bottom: 90px;
  }

  .page-about .pa-section__index {
    align-items: flex-end;
    text-align: right;
    position: sticky;
    top: 140px;
    align-self: start;
    gap: 14px;
  }

  .page-about .pa-section__num {
    font-size: 96px;
  }

  .page-about .pa-section__title {
    font-size: clamp(36px, 4.5vw, 58px);
  }

  .page-about .pa-hero {
    min-height: 620px;
    padding-top: 120px;
    padding-bottom: 80px;
  }

  .page-about .pa-hero__inner {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: center;
  }

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

  .page-about .pa-timeline::before {
    left: 72px;
  }

  .page-about .pa-timeline__item {
    grid-template-columns: 100px 1fr;
    gap: 18px;
  }

  .page-about .pa-timeline__node {
    flex-direction: column-reverse;
    align-items: flex-start;
    gap: 6px;
    padding-top: 18px;
  }

  .page-about .pa-timeline__year {
    min-width: auto;
    padding: 0;
    font-size: 13px;
  }

  .page-about .pa-timeline__marker {
    margin-left: 0;
    width: 16px;
    height: 16px;
  }

  .page-about .pa-data__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .pa-data-card {
    padding: 32px 24px;
  }

  .page-about .pa-chart {
    gap: 24px;
    height: 240px;
    padding: 0 12px;
  }

  .page-about .pa-data__record-list {
    grid-template-columns: 1fr 1fr;
    gap: 14px 24px;
  }

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

  .page-about .pa-cert-card summary {
    padding: 24px;
  }

  .page-about .pa-crosslink__grid {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
}

@media (min-width: 1200px) {
  .page-about .pa-milestones__visual {
    max-width: 720px;
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .pa-data__main::before {
    font-size: 180px;
    right: -20px;
    top: -40px;
  }

  .page-about .pa-data__chart {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    column-gap: 32px;
    align-items: center;
    padding: 32px;
  }

  .page-about .pa-data__chart-head {
    margin-bottom: 0;
  }

  .page-about .pa-data__chart-note {
    grid-column: 1 / -1;
  }

  .page-about .pa-chart {
    height: 200px;
  }

  .page-about .pa-data__records {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 28px;
    align-items: start;
  }

  .page-about .pa-data__records-title {
    margin-bottom: 0;
  }

  .page-about .pa-cert__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .pa-crosslink__grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
  }

  .page-about .pa-crosslink__item {
    padding: 28px 20px;
  }
}

@media (prefers-color-scheme: light) {
  .page-about {
    background-color: var(--pa-deep);
    color: #FFFFFF;
  }
}

.page-about {
  --bar-height: 1rem;
}