.page-about {
  --pj-ink: #F0F5FF;
  --pj-dim: rgba(240, 245, 255, 0.62);
  --pj-line: rgba(0, 255, 170, 0.18);
  --pj-line-gold: rgba(255, 215, 0, 0.30);
  --pj-panel: rgba(15, 36, 64, 0.78);
  --pj-glow: rgba(0, 255, 170, 0.35);
  position: relative;
  background:
    linear-gradient(125deg, rgba(46, 27, 94, 0.52) 0%, transparent 36%),
    linear-gradient(245deg, rgba(0, 128, 143, 0.18) 0%, transparent 42%),
    var(--sf-bg-deep);
  overflow: clip;
}

.page-about::before {
  content: "SF//CN";
  position: absolute;
  top: 120px;
  right: -80px;
  z-index: 0;
  font-size: clamp(140px, 24vw, 480px);
  font-weight: 900;
  font-style: italic;
  line-height: 1;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(0, 255, 170, 0.08);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

.page-about .container {
  position: relative;
  z-index: 1;
  padding: 28px 20px 96px;
}

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

.page-about .breadcrumb {
  margin-bottom: 28px;
}

.pj-hero {
  position: relative;
  display: grid;
  gap: 28px;
  margin-bottom: 48px;
}

.pj-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(115deg, rgba(0, 255, 170, 0.10) 0%, transparent 42%),
    linear-gradient(30deg, rgba(46, 27, 94, 0.40) 16%, transparent 70%);
  clip-path: polygon(0 0, 60% 0, 26% 100%, 0 100%);
  pointer-events: none;
}

.pj-hero-main,
.pj-hero-figure {
  position: relative;
  z-index: 1;
}

.pj-hero-main {
  padding: 28px 0 12px;
}

.pj-hero-kicker {
  font-family: var(--sf-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  color: var(--sf-accent);
  margin-bottom: 16px;
}

.pj-hero-title {
  font-size: clamp(2.05rem, 6vw, 4.1rem);
  font-weight: 900;
  font-style: italic;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: var(--sf-white);
  line-height: 1.13;
  margin-bottom: 18px;
}

.pj-hero-title::after {
  content: "";
  display: block;
  width: 76px;
  height: 4px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--sf-accent), var(--sf-gold));
  border-radius: 2px;
}

.pj-hero-desc {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--pj-dim);
  max-width: 60ch;
  margin-bottom: 24px;
}

.pj-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .tag {
  background: var(--sf-bg-card);
  color: var(--sf-accent);
  border: 1px solid var(--pj-line);
  font-family: var(--sf-font-mono);
  font-size: 0.78rem;
}

.pj-hero-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sf-font-mono);
  font-size: 0.78rem;
  color: var(--pj-dim);
}

.pj-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sf-accent);
  box-shadow: 0 0 12px var(--pj-glow);
  animation: pj-blink 1.8s ease-in-out infinite alternate;
}

@keyframes pj-blink {
  from {
    opacity: 0.5;
    box-shadow: 0 0 4px rgba(0, 255, 170, 0.4);
  }
  to {
    opacity: 1;
    box-shadow: 0 0 18px rgba(0, 255, 170, 0.8);
  }
}

@media (prefers-reduced-motion: reduce) {
  .pj-status-dot {
    animation: none;
  }
}

.pj-hero-figure {
  margin: 0;
  border: 1px solid var(--pj-line);
  background: var(--sf-bg-card);
  overflow: hidden;
  align-self: start;
}

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

.pj-index {
  padding: 18px;
  margin-bottom: 40px;
  background: rgba(10, 26, 47, 0.80);
  border: 1px solid var(--pj-line);
  border-radius: var(--sf-radius);
}

.pj-index-title {
  font-family: var(--sf-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.20em;
  color: var(--pj-dim);
  margin-bottom: 12px;
}

.pj-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.pj-index-link {
  display: block;
  padding: 8px 10px;
  border: 1px solid rgba(240, 245, 255, 0.08);
  border-radius: var(--sf-radius);
  color: var(--pj-dim);
  font-size: 0.80rem;
  text-decoration: none;
  transition: color 0.25s, border-color 0.25s, background 0.25s;
}

.pj-index-num {
  font-family: var(--sf-font-mono);
  color: var(--sf-accent);
  margin-right: 4px;
  font-size: 0.72rem;
}

.pj-index-link:hover {
  color: var(--sf-white);
  border-color: var(--pj-line);
  background: rgba(0, 255, 170, 0.06);
}

.pj-section {
  scroll-margin-top: 32px;
  padding: 44px 0 12px;
  border-top: 1px solid rgba(240, 245, 255, 0.08);
}

.page-about .section-head {
  margin-bottom: 20px;
}

.page-about .section-index {
  display: block;
  font-family: var(--sf-font-mono);
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--sf-accent);
  margin-bottom: 10px;
}

.page-about .section-title {
  font-size: clamp(1.55rem, 4.2vw, 2.5rem);
  font-weight: 900;
  font-style: italic;
  color: var(--sf-white);
  line-height: 1.2;
}

.page-about .section-desc {
  color: var(--sf-gold);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  margin-top: 6px;
}

.pj-origin-grid {
  display: grid;
  gap: 20px;
}

.pj-origin-copy p {
  color: var(--pj-dim);
  font-size: 0.95rem;
  line-height: 1.85;
  margin-bottom: 14px;
}

.pj-origin-stat {
  position: relative;
  padding: 26px 22px;
  background: var(--pj-panel);
  border: 1px solid var(--pj-line-gold);
  border-radius: var(--sf-radius);
  overflow: hidden;
}

.pj-origin-stat::after {
  content: "";
  position: absolute;
  right: -28px;
  bottom: -28px;
  width: 90px;
  height: 90px;
  border: 2px solid rgba(255, 215, 0, 0.20);
  border-radius: 50%;
}

.pj-stat-year {
  font-family: var(--sf-font-mono);
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 800;
  line-height: 0.95;
  color: transparent;
  -webkit-text-stroke: 2px var(--sf-gold);
  margin-bottom: 10px;
}

.pj-stat-label {
  font-size: 1.10rem;
  font-weight: 800;
  color: var(--sf-white);
  margin-bottom: 4px;
}

.pj-stat-tip {
  font-size: 0.82rem;
  color: var(--pj-dim);
  font-family: var(--sf-font-mono);
}

.pj-timeline {
  position: relative;
  margin-top: 36px;
  padding-left: 26px;
  display: grid;
  gap: 24px;
}

.pj-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 5px;
  width: 2px;
  background: linear-gradient(180deg, var(--sf-accent), rgba(0, 255, 170, 0.10) 66%, transparent);
}

.pj-timeline-item {
  position: relative;
  padding: 18px 18px 18px 22px;
  background: var(--pj-panel);
  border: 1px solid rgba(240, 245, 255, 0.07);
  border-radius: var(--sf-radius);
  transition: border-color 0.30s ease, transform 0.30s ease;
}

.pj-timeline-item:hover {
  border-color: var(--pj-line);
  transform: translateY(-2px);
}

.pj-timeline-dot {
  position: absolute;
  top: 28px;
  left: -23px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sf-accent);
  box-shadow: 0 0 0 4px rgba(0, 255, 170, 0.12), 0 0 16px var(--pj-glow);
}

.pj-timeline-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.pj-timeline-year {
  font-family: var(--sf-font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--sf-accent);
  letter-spacing: 0.02em;
}

.pj-timeline-title {
  font-size: 1.10rem;
  font-weight: 700;
  color: var(--sf-white);
}

.pj-timeline-text {
  color: var(--pj-dim);
  font-size: 0.92rem;
  line-height: 1.75;
}

.pj-timeline-more {
  margin-top: 12px;
  border: 1px solid var(--pj-line);
  border-radius: var(--sf-radius);
  background: rgba(10, 26, 47, 0.60);
}

.pj-timeline-more summary {
  cursor: pointer;
  padding: 10px 14px;
  font-family: var(--sf-font-mono);
  font-size: 0.82rem;
  color: var(--sf-gold);
  list-style: none;
}

.pj-timeline-more summary::-webkit-details-marker {
  display: none;
}

.pj-timeline-more summary::before {
  content: "▸ ";
  color: var(--sf-accent);
}

.pj-timeline-more[open] summary::before {
  content: "▾ ";
}

.pj-timeline-more p {
  padding: 0 14px 12px;
  color: var(--pj-dim);
  font-size: 0.88rem;
  line-height: 1.70;
}

.pj-timeline-figure {
  margin: 0;
  border: 1px solid var(--pj-line);
  border-radius: var(--sf-radius);
  overflow: hidden;
  background: var(--sf-bg-card);
}

.pj-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.pj-philosophy-intro {
  color: var(--pj-dim);
  font-size: 1rem;
  line-height: 1.80;
  max-width: 64ch;
  margin-bottom: 24px;
}

.pj-pillars {
  display: grid;
  gap: 16px;
}

.pj-pillar {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px 22px 24px;
  background: var(--pj-panel);
  border: 1px solid rgba(240, 245, 255, 0.07);
  border-radius: var(--sf-radius);
  overflow: hidden;
  transition: transform 0.30s ease, border-color 0.30s ease;
}

.pj-pillar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--sf-accent), transparent 72%);
  opacity: 0.55;
}

.pj-pillar:hover {
  transform: translateY(-4px);
  border-color: var(--pj-line);
}

.pj-pillar-num {
  font-family: var(--sf-font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--sf-accent);
  margin-bottom: 10px;
}

.pj-pillar h3 {
  font-size: 1.20rem;
  font-weight: 800;
  color: var(--sf-white);
  margin-bottom: 8px;
}

.pj-pillar p:not(.pj-pillar-num) {
  color: var(--pj-dim);
  font-size: 0.92rem;
  line-height: 1.75;
  margin-bottom: 16px;
}

.pj-pillar .btn {
  margin-top: auto;
  align-self: flex-start;
}

.pj-eco-grid {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.pj-eco-info {
  display: grid;
  gap: 16px;
}

.pj-eco-card {
  padding: 22px;
  background: var(--pj-panel);
  border: 1px solid rgba(240, 245, 255, 0.07);
  border-radius: var(--sf-radius);
}

.pj-eco-card h3 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--sf-gold);
  margin-bottom: 10px;
}

.pj-eco-icp {
  font-family: var(--sf-font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--sf-accent);
  margin-bottom: 6px;
  word-break: break-word;
}

.pj-eco-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.pj-eco-list li {
  position: relative;
  padding-left: 20px;
  color: var(--pj-dim);
  font-size: 0.92rem;
  line-height: 1.60;
}

.pj-eco-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--sf-accent);
}

.pj-eco-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.pj-eco-figure {
  margin: 0;
  border: 1px solid var(--pj-line);
  border-radius: var(--sf-radius);
  overflow: hidden;
  background: var(--sf-bg-card);
  align-self: center;
}

.pj-eco-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.pj-outro {
  margin-top: 48px;
  padding: 32px 24px;
  background:
    linear-gradient(120deg, rgba(0, 255, 170, 0.08), transparent 55%),
    var(--sf-bg-card);
  border: 1px solid var(--pj-line);
  border-radius: var(--sf-radius);
}

.pj-outro-tag {
  font-family: var(--sf-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  color: var(--sf-gold);
  margin-bottom: 10px;
}

.pj-outro-text {
  font-size: 1.10rem;
  font-weight: 600;
  color: var(--sf-white);
  line-height: 1.65;
  margin-bottom: 20px;
  max-width: 42ch;
}

.pj-outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 760px) {
  .pj-hero {
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
    gap: 40px;
  }

  .pj-hero-main {
    padding: 44px 0 20px;
  }

  .pj-origin-grid {
    grid-template-columns: minmax(0, 1.30fr) minmax(260px, 0.70fr);
    align-items: end;
  }

  .pj-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .pj-eco-grid {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 1.10fr);
    align-items: center;
  }
}

@media (min-width: 980px) {
  .pj-layout {
    display: grid;
    grid-template-columns: 230px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .pj-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }

  .pj-index-list {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .pj-index-link {
    border: none;
    border-left: 2px solid rgba(240, 245, 255, 0.10);
    border-radius: 0;
    padding: 10px 12px;
  }

  .pj-index-link:hover {
    border-left-color: var(--sf-accent);
    background: transparent;
  }

  .pj-content {
    min-width: 0;
  }

  .pj-section {
    padding: 56px 0 12px;
  }

  .pj-timeline {
    padding-left: 34px;
  }

  .pj-timeline-item {
    padding: 24px 28px 24px 30px;
  }

  .pj-timeline-dot {
    top: 32px;
    left: -28px;
  }
}

@media (min-width: 1200px) {
  .pj-hero {
    gap: 56px;
  }

  .pj-hero-desc {
    font-size: 1.05rem;
  }

  .pj-eco-card {
    padding: 26px;
  }
}