.page-about {
  --about-hero-kicker: var(--brand);
  --about-timeline-line: var(--line);
  --about-glow-green: rgba(111, 191, 68, 0.09);
  background:
    radial-gradient(circle at 88% 2%, rgba(111, 191, 68, 0.05) 0, transparent 420px),
    var(--bg);
}

.page-about .breadcrumb {
  padding-top: 24px;
  padding-bottom: 0;
}

.page-about__hero {
  position: relative;
  padding: 44px 0 56px;
  border-bottom: 1px solid var(--line);
  background-image:
    linear-gradient(to right, rgba(45, 64, 51, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(45, 64, 51, 0.45) 1px, transparent 1px);
  background-size: 44px 44px;
  overflow: hidden;
}

.page-about__hero-grid {
  display: grid;
  gap: 36px;
  align-items: end;
}

.page-about__hero-main {
  position: relative;
  z-index: 1;
}

.page-about__hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--about-hero-kicker);
}

.page-about__hero-kicker::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--brand);
}

.page-about__hero-main h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 18px 0 22px;
}

.page-about__hero-main .lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
  max-width: 680px;
  margin: 0 0 14px;
}

.page-about__hero-main > p:last-of-type {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 640px;
  margin: 0;
}

.page-about__hero-meta {
  position: relative;
  z-index: 1;
  border: 1px solid var(--line);
  background: rgba(20, 33, 26, 0.74);
}

.page-about__hero-meta-title {
  margin: 0;
  padding: 13px 16px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-about__meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about__meta-item {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-bottom: 1px solid var(--line);
}

.page-about__meta-item:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.page-about__meta-item:nth-last-child(-n+2) {
  border-bottom: none;
}

.page-about__meta-term {
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.page-about__meta-value {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
}

.page-about__hero-deco {
  position: absolute;
  right: -12px;
  bottom: 18px;
  font-family: var(--font-index);
  font-size: clamp(44px, 9vw, 92px);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
  opacity: 0.55;
  user-select: none;
  pointer-events: none;
}

.page-about__spy {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about__spy-link {
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 8px 11px;
  line-height: 1.2;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about__spy-link:hover {
  color: var(--text);
  border-color: var(--brand);
}

.page-about__spy-link.is-active {
  color: var(--bg);
  background: var(--brand);
  border-color: var(--brand);
}

.page-about .section__header {
  position: relative;
  padding-bottom: 24px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.page-about .section__number {
  display: inline-block;
  margin-right: 12px;
  font-family: var(--font-index);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--brand);
  vertical-align: baseline;
}

.page-about .section__header .kicker {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .section__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 14px 0 12px;
}

.page-about .section__intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 760px;
  margin: 0;
}

.page-about__timeline-wrap {
  display: grid;
  gap: 44px;
  align-items: start;
}

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

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: clamp(64px, 12vw, 96px) - 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--brand) 0%, var(--line) 36%, var(--line) 100%);
}

.page-about__milestone {
  display: grid;
  grid-template-columns: clamp(64px, 12vw, 96px) 20px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 28px;
  position: relative;
}

.page-about__milestone:last-child {
  padding-bottom: 0;
}

.page-about__milestone-year {
  font-family: var(--font-index);
  font-size: 14px;
  font-weight: 500;
  color: var(--brand);
  text-align: right;
  padding-top: 8px;
  white-space: nowrap;
}

.page-about__milestone-dot {
  width: 9px;
  height: 9px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--brand);
  box-shadow: 0 0 0 3px var(--bg);
  position: relative;
  z-index: 1;
  transition: background 0.25s ease;
}

.page-about__milestone:last-child .page-about__milestone-dot {
  background: var(--brand);
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 5px var(--line);
}

.page-about__milestone-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 18px 44px 18px 18px;
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.page-about__milestone:hover .page-about__milestone-card {
  border-color: var(--brand);
  background: linear-gradient(135deg, var(--about-glow-green) 0%, var(--panel) 78%);
  transform: translateX(2px);
}

.page-about__milestone-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  opacity: 0;
  transition: opacity 0.25s ease;
}

.page-about__milestone:hover .page-about__milestone-card::before {
  opacity: 0.85;
}

.page-about__milestone-card::after {
  content: "→";
  position: absolute;
  right: 16px;
  bottom: 12px;
  font-family: var(--font-index);
  font-size: 15px;
  color: var(--brand);
  opacity: 0.4;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.page-about__milestone:hover .page-about__milestone-card::after {
  opacity: 1;
  transform: translateX(3px);
}

.page-about__milestone-hint {
  position: absolute;
  top: -1px;
  right: -1px;
  padding: 4px 8px;
  font-family: var(--font-index);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--text);
  background: var(--line);
  opacity: 0;
  transition: opacity 0.25s ease, background 0.25s ease;
}

.page-about__milestone:hover .page-about__milestone-hint,
.page-about__milestone:focus-within .page-about__milestone-hint {
  opacity: 1;
  background: var(--brand);
  color: var(--bg);
}

.page-about__milestone-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--text);
}

.page-about__milestone-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about__timeline-figure,
.page-about__system-figure,
.page-about__service-figure {
  position: relative;
  margin: 0;
  background: var(--panel);
}

.page-about__timeline-figure::before,
.page-about__system-figure::before,
.page-about__service-figure::before {
  content: "";
  position: absolute;
  inset: 12px 12px -12px -12px;
  border: 1px solid var(--line);
  z-index: 0;
  pointer-events: none;
}

.page-about__timeline-figure img,
.page-about__system-figure img,
.page-about__service-figure img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  display: block;
}

.page-about__system-layout {
  display: grid;
  gap: 44px;
  align-items: start;
}

.page-about__system-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about__system-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 20px;
  min-width: 0;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about__system-card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
}

.page-about__system-card summary {
  list-style: none;
  cursor: pointer;
}

.page-about__system-card summary::-webkit-details-marker {
  display: none;
}

.page-about__system-num {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--brand);
  border: 1px solid var(--line);
  padding: 3px 7px;
  margin-bottom: 12px;
}

.page-about__system-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--text);
}

.page-about__system-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
  margin: 0;
}

.page-about__system-card .badge {
  position: absolute;
  top: 16px;
  right: 16px;
}

.page-about__system-card--expand[open] {
  border-color: var(--brand);
}

.page-about__system-card--expand summary::after {
  content: "+";
  position: absolute;
  bottom: 14px;
  right: 14px;
  width: 24px;
  height: 24px;
  border: 1px solid var(--line);
  color: var(--brand);
  font-family: var(--font-index);
  font-size: 14px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about__system-card--expand[open] summary::after {
  content: "−";
  border-color: var(--brand);
  color: var(--accent);
}

.page-about__system-more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about__system-more p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about__flow {
  margin-top: 48px;
  padding: 28px;
  border-top: 2px solid var(--brand);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel) 0%, var(--bg) 100%);
}

.page-about__flow .kicker {
  color: var(--brand);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about__flow h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 10px 0 18px;
  color: var(--text);
}

.page-about__flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about__flow-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--line);
  font-size: 14px;
  color: var(--text);
  transition: border-color 0.2s ease;
}

.page-about__flow-list li:hover {
  border-color: var(--brand);
}

.page-about__flow-list li span {
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--accent);
}

.page-about__flow-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about__team-grid {
  display: grid;
  gap: 18px;
}

.page-about__team-card {
  position: relative;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 26px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about__team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--brand) 0%, var(--accent) 100%);
  opacity: 0.7;
}

.page-about__team-card--accent::before {
  background: linear-gradient(90deg, var(--accent) 0%, var(--brand) 100%);
}

.page-about__team-card:hover {
  border-color: var(--brand);
  transform: translateY(-3px);
}

.page-about__team-role {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding-bottom: 6px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--brand);
}

.page-about__team-card--accent .page-about__team-role {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.page-about__team-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about__team-note {
  margin-top: 24px;
  display: grid;
  gap: 12px;
}

.page-about__team-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about__service-layout {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about__service-list {
  display: grid;
}

.page-about__service-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 18px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about__service-item:first-child {
  border-top: 1px solid var(--line);
}

.page-about__service-index {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-index);
  font-size: 16px;
  font-weight: 700;
  color: var(--bg);
  background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
}

.page-about__service-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--text);
}

.page-about__service-item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about__service-note {
  margin-top: 32px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: rgba(247, 213, 30, 0.05);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about__service-note a {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about__service-note a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.page-about__outro {
  margin-top: 72px;
  padding: 52px 0 64px;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(circle at 18% 20%, rgba(111, 191, 68, 0.12) 0, transparent 46%),
    radial-gradient(circle at 82% 78%, rgba(247, 213, 30, 0.08) 0, transparent 42%),
    var(--bg);
}

.page-about__outro-inner {
  display: grid;
  gap: 22px;
  justify-items: start;
}

.page-about__outro-inner > p {
  margin: 0;
  font-size: 18px;
  line-height: 1.7;
  color: var(--text);
  max-width: 720px;
}

.page-about__outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 640px) {
  .page-about__meta-item {
    padding: 18px 20px;
  }

  .page-about__meta-value {
    font-size: 22px;
  }

  .page-about__system-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about__flow-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about__service-item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 22px;
    padding: 28px 0;
  }
}

@media (min-width: 960px) {
  .page-about__hero {
    padding: 64px 0 88px;
  }

  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 64px;
  }

  .page-about__spy {
    padding: 20px 0;
    gap: 10px;
  }

  .page-about__timeline-wrap {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
  }

  .page-about__timeline-figure {
    position: sticky;
    top: 28px;
    align-self: start;
  }

  .page-about__system-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 56px;
  }

  .page-about__system-figure {
    align-self: start;
  }

  .page-about__service-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 56px;
  }

  .page-about__service-item {
    padding: 28px 0;
  }

  .page-about__outro {
    padding: 68px 0 80px;
  }
}