.page-about {
  --about-track: 150px;
  --about-cyan-soft: rgba(47, 224, 200, 0.14);
  --about-orange-soft: rgba(255, 138, 60, 0.16);
  min-width: 0;
}

.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: center;
  padding: 20px 0 48px;
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 30em;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-fact__label {
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* hero visual */
.page-about .hero-orbit {
  position: relative;
  width: 100%;
  min-height: 300px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  overflow: hidden;
  background:
    radial-gradient(120% 78% at 50% 0%, rgba(47, 224, 200, 0.11), transparent 62%),
    linear-gradient(180deg, var(--panel) 0%, rgba(16, 29, 51, 0.3) 100%);
}

.page-about .hero-orbit::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(27, 44, 71, 0.8) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 44, 71, 0.8) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.6;
}

.page-about .hero-orbit__axis {
  position: absolute;
  left: 34%;
  top: 13%;
  bottom: 13%;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--cyan) 14%, rgba(47, 224, 200, 0.4) 86%, transparent);
}

.page-about .hero-orbit__dot {
  position: absolute;
  left: 34%;
  width: 11px;
  height: 11px;
  margin-left: -5.5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(47, 224, 200, 0.13);
}

.page-about .hero-orbit__dot--a { top: 21%; }
.page-about .hero-orbit__dot--b { top: 47%; background: var(--orange); box-shadow: 0 0 0 6px rgba(255, 138, 60, 0.15); }
.page-about .hero-orbit__dot--c { top: 73%; }

.page-about .hero-orbit__cap {
  position: absolute;
  left: calc(34% + 22px);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .hero-orbit__cap--a { top: calc(21% - 9px); }
.page-about .hero-orbit__cap--b { top: calc(47% - 9px); color: var(--text-soft); }
.page-about .hero-orbit__cap--c { top: calc(73% - 9px); }

/* chapter spacing */
.page-about .chapter-mark {
  margin-bottom: 22px;
}

/* 01 origin */
.page-about .about-origin {
  max-width: 40em;
}

.page-about .about-bridge {
  margin: 26px 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-bridge a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 200, 0.35);
  padding-bottom: 1px;
}

.page-about .about-bridge a:hover,
.page-about .about-bridge a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 02 timeline band */
.page-about .tl-band {
  position: relative;
  height: 190px;
  margin: 8px 0 30px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .tl-band img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .tl-band__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 17, 32, 0.3) 0%, rgba(10, 17, 32, 0.86) 58%, var(--ink) 100%);
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(47, 224, 200, 0.5) 8%, rgba(47, 224, 200, 0.5) 92%, transparent);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 26px 0 26px 40px;
  min-width: 0;
  outline: none;
}

.page-about .tl__dot {
  position: absolute;
  left: 6px;
  top: 32px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid rgba(47, 224, 200, 0.55);
  transition: background 360ms var(--ease), box-shadow 360ms var(--ease), border-color 360ms var(--ease);
}

.page-about .tl__item.is-visible .tl__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px var(--about-cyan-soft);
}

.page-about .tl__item:focus-within .tl__dot,
.page-about .tl__item:focus .tl__dot {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 5px var(--about-orange-soft);
}

.page-about .tl__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 7vw, 2.4rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(47, 224, 200, 0.3);
}

.page-about .tl__title {
  margin: 8px 0 0;
  font-size: 1.08rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .tl__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
  max-width: 38em;
}

/* 03 team */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: start;
}

.page-about .team-intro {
  margin: 0 0 4px;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 34em;
}

.page-about .team-stack {
  display: flex;
  gap: 4px;
  height: 62px;
  margin: 26px 0 20px;
}

.page-about .team-stack__seg {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  border-radius: 4px;
  cursor: default;
  outline: none;
  transition: filter 240ms var(--ease);
}

.page-about .team-stack__seg:first-child {
  border-radius: 12px 4px 4px 12px;
}

.page-about .team-stack__seg:last-child {
  border-radius: 4px 12px 12px 4px;
}

.page-about .team-stack__seg--dev {
  background: linear-gradient(180deg, rgba(47, 224, 200, 0.92), rgba(47, 224, 200, 0.58));
  color: #04211c;
}

.page-about .team-stack__seg--ops {
  background: linear-gradient(180deg, rgba(255, 138, 60, 0.92), rgba(255, 138, 60, 0.58));
  color: #2b1304;
}

.page-about .team-stack__seg--dsg {
  background: linear-gradient(180deg, #1b2c47, rgba(27, 44, 71, 0.78));
  border: 1px solid var(--line);
  color: var(--text);
}

.page-about .team-stack__seg:hover,
.page-about .team-stack__seg:focus {
  filter: brightness(1.12);
}

.page-about .team-stack__val {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
}

.page-about .team-stack__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 12px);
  transform: translateX(-50%) translateY(6px);
  width: max-content;
  max-width: min(240px, 70vw);
  padding: 10px 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text-soft);
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 220ms var(--ease), transform 220ms var(--ease), visibility 220ms;
  z-index: 4;
}

.page-about .team-stack__seg:hover .team-stack__tip,
.page-about .team-stack__seg:focus .team-stack__tip {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.page-about .team-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-legend__item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.03em;
}

.page-about .team-legend__dot {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  flex: none;
}

.page-about .team-legend__dot--dev { background: var(--cyan); }
.page-about .team-legend__dot--ops { background: var(--orange); }
.page-about .team-legend__dot--dsg { background: var(--line); }

.page-about .team-visual {
  margin: 0;
}

/* 04 nodes */
.page-about .nodes-intro {
  margin: 0 0 26px;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 38em;
}

.page-about .node-map {
  position: relative;
  padding: 24px 0 30px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .node-map__arcs {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.page-about .node-map__list {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 22px 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .node-map__item {
  flex: 1 1 132px;
  min-width: 0;
  display: grid;
  gap: 6px;
  padding: 6px 4px;
  outline: none;
  border-radius: var(--radius-sm);
  transition: background 240ms var(--ease);
}

.page-about .node-map__item:focus,
.page-about .node-map__item:hover {
  background: var(--glass);
}

.page-about .node-map__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px var(--about-cyan-soft);
  transition: background 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .node-map__item:focus .node-map__dot,
.page-about .node-map__item:hover .node-map__dot {
  background: var(--orange);
  box-shadow: 0 0 0 5px var(--about-orange-soft);
}

.page-about .node-map__city {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.02em;
}

.page-about .node-map__role {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .nodes-visual {
  margin: 30px 0 0;
}

.page-about .nodes-meta {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* 05 rhythm */
.page-about .rhythm-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .rhythm-strip__item {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 20px 22px;
  background: var(--panel);
}

.page-about .rhythm-strip__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .rhythm-strip__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-soft);
}

@media (min-width: 760px) {
  .page-about .rhythm-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    padding: 34px 0 76px;
  }

  .page-about .hero-orbit {
    min-height: 400px;
  }

  .page-about .tl-band {
    height: 260px;
  }

  .page-about .tl::before {
    left: 169px;
  }

  .page-about .tl__item {
    grid-template-columns: var(--about-track) 38px minmax(0, 1fr);
    gap: 0;
    padding: 38px 0;
    align-items: start;
  }

  .page-about .tl__head {
    grid-column: 1;
    text-align: right;
    padding-right: 10px;
  }

  .page-about .tl__num {
    font-size: 2.4rem;
  }

  .page-about .tl__title {
    margin-top: 10px;
    font-size: 1.12rem;
  }

  .page-about .tl__dot {
    position: relative;
    left: auto;
    top: 14px;
    grid-column: 2;
    justify-self: center;
  }

  .page-about .tl__body {
    grid-column: 3;
    padding-left: 22px;
    min-width: 0;
  }

  .page-about .tl__desc {
    max-width: 36em;
  }
}

@media (min-width: 960px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__dot,
  .page-about .team-stack__seg,
  .page-about .team-stack__tip,
  .page-about .node-map__dot,
  .page-about .node-map__item {
    transition: none;
  }
}