.page-about {
  --about-pad: clamp(1.5rem, 5vw, 4.5rem);
  --about-card-bg: rgba(16, 44, 76, 0.42);
  --about-card-bg-deep: rgba(11, 26, 46, 0.72);
  --about-border: rgba(242, 245, 248, 0.14);
  --about-dim: rgba(242, 245, 248, 0.4);
  --about-weak: rgba(242, 245, 248, 0.08);
  --about-green-ring: rgba(57, 255, 158, 0.18);
  --about-red-ring: rgba(230, 58, 62, 0.2);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2.5rem, 6vw, 5rem) var(--about-pad) 2rem;
  background: linear-gradient(150deg, var(--c-primary) 0%, var(--c-primary-2) 58%, rgba(230, 58, 62, 0.28) 100%);
  border-bottom: 1px solid var(--about-border);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34%;
  height: 100%;
  background: var(--c-red-soft);
  clip-path: polygon(0 0, 62% 0, 12% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(720px, 70%);
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--c-accent-2));
  pointer-events: none;
}

.page-about .about-hero-deco {
  position: absolute;
  top: 0.25rem;
  right: 0;
  z-index: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(7.5rem, 20vw, 17rem);
  line-height: 1;
  letter-spacing: -0.06em;
  color: rgba(242, 245, 248, 0.05);
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1040px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 5vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  max-width: 13em;
  margin: 0.6rem 0 1rem;
}

.page-about .about-hero-lead {
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  line-height: 1.75;
  color: var(--c-text-dim);
  max-width: 28em;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 2rem;
}

.page-about .about-hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 2.75rem;
  background: var(--about-border);
  border: 1px solid var(--about-border);
  border-radius: var(--rad-lg);
  overflow: hidden;
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1rem;
  background: rgba(11, 26, 46, 0.86);
}

.page-about .hero-stat-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1;
  color: var(--c-white);
  white-space: nowrap;
}

.page-about .hero-stat-label {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--c-text-dim);
  letter-spacing: 0.08em;
}

.page-about .stat-unit {
  font-size: 0.55em;
  color: var(--c-accent-2);
  margin-left: 2px;
}

.page-about .section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  color: var(--c-accent-2);
}

.page-about .label-index {
  font-family: var(--font-mono);
  color: var(--c-text-dim);
  font-size: 0.85em;
}

.page-about .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(242, 245, 248, 0.28);
  color: var(--c-text);
  border-radius: var(--rad-pill);
  padding: 0.75rem 1.4rem;
  font-weight: 600;
  background: transparent;
  text-decoration: none;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .btn-ghost:hover {
  background: rgba(242, 245, 248, 0.08);
  border-color: var(--c-accent-2);
  color: var(--c-white);
}

.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  padding: var(--about-pad) 0;
  background-image:
    linear-gradient(rgba(242, 245, 248, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 245, 248, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 160px;
  right: -140px;
  width: 420px;
  height: 540px;
  background: rgba(230, 58, 62, 0.12);
  border: 1px solid rgba(230, 58, 62, 0.26);
  border-radius: 40px;
  transform: rotate(18deg);
  pointer-events: none;
}

.page-about .about-timeline-head {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin-inline: auto;
  margin-bottom: 3rem;
  padding-inline: var(--about-pad);
}

.page-about .about-timeline-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -0.03em;
  margin: 0.5rem 0 0.75rem;
}

.page-about .timeline-intro {
  color: var(--c-text-dim);
  max-width: 46em;
  margin: 0;
}

.page-about .about-timeline-list {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 28px;
  max-width: 920px;
  margin-inline: auto;
  padding: 0 var(--about-pad);
}

.page-about .tl-card {
  position: relative;
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 16px;
  padding: 22px;
  background: linear-gradient(135deg, var(--about-card-bg), rgba(11, 26, 46, 0.2));
  border: 1px solid var(--about-border);
  border-radius: var(--rad-lg);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-about .tl-card:hover {
  transform: translateY(-4px);
  border-color: rgba(57, 255, 158, 0.4);
  box-shadow: 0 18px 44px rgba(4, 13, 25, 0.36), 0 0 0 1px rgba(57, 255, 158, 0.08);
}

.page-about .tl-card--milestone {
  background: linear-gradient(135deg, rgba(230, 58, 62, 0.16) 0%, rgba(16, 44, 76, 0.62) 46%);
  border-color: rgba(230, 58, 62, 0.42);
}

.page-about .tl-card-railing {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .tl-card-railing::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(57, 255, 158, 0.55) 0%, rgba(230, 58, 62, 0.4) 100%);
  border-radius: 2px;
}

.page-about .tl-dot {
  position: relative;
  z-index: 1;
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  margin-top: 4px;
  border-radius: 50%;
  background: var(--c-accent-2);
  box-shadow: 0 0 0 4px var(--about-green-ring);
  transition: box-shadow 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about .tl-dot--hot {
  background: var(--c-accent);
  box-shadow: 0 0 0 4px var(--about-red-ring);
}

.page-about .tl-dot--value {
  background: var(--c-white);
  box-shadow: 0 0 0 4px rgba(242, 245, 248, 0.16);
}

.page-about .tl-card:hover .tl-dot,
.page-about .tl-dot:hover {
  transform: scale(1.2);
  box-shadow: 0 0 0 8px rgba(57, 255, 158, 0.18), 0 0 26px rgba(57, 255, 158, 0.4);
}

.page-about .tl-card--milestone:hover .tl-dot--hot,
.page-about .tl-dot--hot:hover {
  box-shadow: 0 0 0 8px rgba(230, 58, 62, 0.2), 0 0 26px rgba(230, 58, 62, 0.45);
}

.page-about .tl-card-main {
  min-width: 0;
}

.page-about .tl-topic {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .tl-node-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--c-accent-2);
}

.page-about .tl-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--rad-pill);
  background: rgba(57, 255, 158, 0.12);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-accent-2);
}

.page-about .tl-tag--accent {
  background: rgba(230, 58, 62, 0.18);
  color: var(--c-white);
}

.page-about .tl-tag--dim {
  background: var(--about-weak);
  color: var(--c-text-dim);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
}

.page-about .tl-card h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

.page-about .tl-card-main p {
  color: var(--c-text-dim);
  line-height: 1.75;
  margin: 0 0 0.9rem;
}

.page-about .tl-card-main p:last-of-type {
  margin-bottom: 0;
}

.page-about .tl-link {
  display: inline-flex;
  margin-top: 0.5rem;
  font-weight: 600;
  color: var(--c-accent-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-about .tl-link:hover {
  border-color: var(--c-accent-2);
  opacity: 0.85;
}

.page-about .tl-media {
  max-width: 560px;
  margin-top: 1.4rem;
  overflow: hidden;
  border-radius: var(--rad-md);
  background: rgba(16, 44, 76, 0.4);
  border: 1px solid rgba(242, 245, 248, 0.08);
}

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

.page-about .tl-media .media-note {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0.7rem 1rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-text-dim);
  background: rgba(11, 26, 46, 0.6);
}

.page-about .tl-principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 1.5rem;
}

.page-about .principle-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  background: rgba(16, 44, 76, 0.5);
  border: 1px solid rgba(242, 245, 248, 0.08);
  border-radius: var(--rad-md);
}

.page-about .principle-icon {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--c-accent-2);
}

.page-about .principle-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .principle-text strong {
  color: var(--c-text);
  font-size: 1rem;
}

.page-about .principle-text span {
  color: var(--c-text-dim);
  font-size: 0.85rem;
}

.page-about .about-next {
  padding: 0 var(--about-pad) var(--about-pad);
}

.page-about .next-panel {
  position: relative;
  overflow: hidden;
  max-width: 920px;
  margin-inline: auto;
  padding: clamp(2.25rem, 6vw, 4.5rem);
  background: linear-gradient(135deg, rgba(230, 58, 62, 0.2) 0%, rgba(16, 44, 76, 0.8) 100%);
  border: 1px solid var(--about-border);
  border-radius: var(--rad-lg);
}

.page-about .next-panel::after {
  content: "GO";
  position: absolute;
  right: 2rem;
  bottom: -1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(5rem, 14vw, 9rem);
  line-height: 1;
  letter-spacing: -0.06em;
  color: rgba(242, 245, 248, 0.04);
  pointer-events: none;
}

.page-about .next-panel h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  letter-spacing: -0.02em;
  margin: 0.5rem 0 0.75rem;
}

.page-about .next-panel p {
  max-width: 44em;
  color: var(--c-text-dim);
  margin: 0;
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 1.75rem;
}

@media (min-width: 640px) {
  .page-about .tl-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.8fr);
    gap: 3.5rem;
    align-items: end;
    padding-bottom: 3rem;
  }

  .page-about .about-hero-deco {
    right: 3%;
    top: 0;
    font-size: clamp(10rem, 20vw, 18rem);
  }

  .page-about .about-hero-stats {
    margin-top: 0;
  }

  .page-about .about-timeline-list {
    gap: 40px;
  }

  .page-about .tl-card {
    grid-template-columns: 64px 1fr;
    gap: 32px;
    padding: 34px 36px 34px 20px;
  }

  .page-about .tl-card:nth-child(even) {
    margin-left: 48px;
  }

  .page-about .tl-card:nth-child(odd) {
    margin-right: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .tl-dot,
  .page-about .btn-ghost,
  .page-about .tl-link {
    transition: none;
  }

  .page-about .tl-card:hover,
  .page-about .tl-dot:hover {
    transform: none;
  }
}