.page-about {
  --about-cut: 22px;
  --about-cut-sm: 12px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 3.6vw, 40px) 0 clamp(36px, 5vw, 64px);
  background:
    linear-gradient(105deg, rgba(217, 228, 238, 0.7) 0 22%, transparent 22%),
    linear-gradient(285deg, rgba(255, 224, 194, 0.55) 0 14%, transparent 14%),
    var(--paper);
  border-bottom: 1px solid var(--line-blue);
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 3.5vw, 44px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-size: clamp(34px, 7.6vw, 76px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 40em;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-hero__badge {
  justify-self: start;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 22px;
  background: var(--navy);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-hero__badge-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-hero__badge-lab {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: rgba(246, 241, 230, 0.82);
}

.page-about .about-hero__vlabel {
  display: none;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-blue);
  border: 1px solid var(--line-blue);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--paper);
}

.page-about .about-fact--hot {
  background: var(--orange-pale);
}

.page-about .about-fact__n {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--navy);
}

.page-about .about-fact__n small {
  font-size: 0.5em;
  margin-left: 2px;
}

.page-about .about-fact--hot .about-fact__n {
  color: var(--orange);
}

.page-about .about-fact__t {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--warm);
}

/* ---------- LAYOUT ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(40px, 6vw, 80px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(52px, 8vw, 104px);
  min-width: 0;
}

/* ---------- CHAPTER ---------- */
.page-about .chapter {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .chapter__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--navy);
  color: var(--paper);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

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

.page-about .chapter__title {
  margin: 0 0 18px;
  font-size: clamp(23px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--navy);
}

.page-about .chapter__body p {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.82;
  color: var(--ink);
  max-width: 38em;
}

.page-about .chapter__note {
  margin: 18px 0 0;
  padding: 14px 18px;
  background: var(--orange-pale);
  border-left: 4px solid var(--orange);
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .about-link {
  color: var(--navy-mid);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange);
}

/* ---------- FIGURES ---------- */
.page-about .about-figure {
  margin: 22px 0 26px;
}

.page-about .about-figure .media {
  border: 1px solid var(--line-blue);
}

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

.page-about .about-figure--square .media {
  max-width: 460px;
}

.page-about .about-figure .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--warm);
}

/* ---------- ROLE CARDS ---------- */
.page-about .role-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .role-card {
  position: relative;
  padding: 22px 20px 24px;
  background: #fff;
  border: 1px solid var(--line-blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut-sm)), calc(100% - var(--about-cut-sm)) 100%, 0 100%);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .role-card:hover {
  border-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .role-card__tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--navy);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
}

.page-about .role-card__name {
  margin: 14px 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--navy);
}

.page-about .role-card__desc {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ink);
}

.page-about .role-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px dashed var(--line-blue);
  padding-top: 12px;
}

.page-about .role-card__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 7px;
  font-size: 14px;
  line-height: 1.66;
  color: var(--warm);
}

.page-about .role-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 2px;
  background: var(--orange);
}

/* ---------- STEP LIST ---------- */
.page-about .step-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-blue);
}

.page-about .step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  grid-template-areas:
    "n t"
    "n d";
  column-gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-blue);
}

.page-about .step__n {
  grid-area: n;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .step__t {
  grid-area: t;
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--navy);
}

.page-about .step__d {
  grid-area: d;
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ink);
}

/* ---------- VERSION LIST ---------- */
.page-about .version-list {
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .version-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-mid) 55%, var(--lime) 100%);
}

.page-about .version {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .version__dot {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--navy);
  border: 2px solid var(--paper);
  transform: rotate(45deg);
}

.page-about .version:last-child .version__dot {
  background: var(--lime);
}

.page-about .version__t {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--navy);
}

.page-about .version__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ink);
  max-width: 36em;
}

/* ---------- COLUMN LIST ---------- */
.page-about .column-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .column-item {
  padding: 18px 18px 20px;
  background: var(--navy);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut-sm)), calc(100% - var(--about-cut-sm)) 100%, 0 100%);
}

.page-about .column-item__t {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .column-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(246, 241, 230, 0.88);
}

/* ---------- USER LIST ---------- */
.page-about .user-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .user-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 16px 18px;
  background: #fff;
  border: 1px solid var(--line-blue);
  border-left: 4px solid var(--orange);
}

.page-about .user-item__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .user-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--ink);
}

/* ---------- FINAL CTA ---------- */
.page-about .chapter--final .chapter__index {
  background: var(--orange);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- TRACK ---------- */
.page-about .about-track {
  display: none;
}

/* ---------- SCALE PANEL ---------- */
.page-about .about-scale {
  position: relative;
  background: var(--navy);
  color: var(--paper);
  padding: clamp(40px, 6vw, 76px) 0;
  overflow: hidden;
}

.page-about .about-scale::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(198, 255, 74, 0.16) 0%, transparent 68%);
  pointer-events: none;
}

.page-about .about-scale__vlabel {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.34em;
  color: var(--lime);
}

.page-about .about-scale__title {
  margin: 14px 0 clamp(26px, 4vw, 44px);
  max-width: 22em;
  font-size: clamp(24px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1.22;
  color: var(--paper);
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(217, 228, 238, 0.18);
  border: 1px solid rgba(217, 228, 238, 0.18);
}

.page-about .scale-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 16px 22px;
  background: var(--navy);
}

.page-about .scale-cell__n {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .scale-cell__n small {
  font-size: 0.46em;
  margin-left: 2px;
}

.page-about .scale-cell--lime .scale-cell__n {
  color: var(--lime);
}

.page-about .scale-cell__t {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(246, 241, 230, 0.78);
}

.page-about .about-scale__note {
  margin: clamp(26px, 4vw, 40px) 0 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.82;
  color: rgba(246, 241, 230, 0.9);
}

/* ---------- REVEAL ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
}

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}

/* ---------- RESPONSIVE ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .about-hero__badge {
    justify-self: end;
  }

  .page-about .chapter {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 22px;
  }

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

  .page-about .step {
    grid-template-columns: 60px minmax(0, 1fr);
    column-gap: 24px;
  }

  .page-about .step__n {
    font-size: 26px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__vlabel {
    display: block;
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%) rotate(90deg);
    transform-origin: right center;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.34em;
    color: var(--warm);
    white-space: nowrap;
    margin: 0;
  }

  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 210px;
    align-items: start;
  }

  .page-about .about-track {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    padding-left: 12px;
  }

  .page-about .about-track__rail {
    position: absolute;
    left: 12px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: var(--line-blue);
  }

  .page-about .about-track__line {
    display: block;
    width: 100%;
    height: 42%;
    background: linear-gradient(180deg, var(--navy) 0%, var(--lime) 100%);
  }

  .page-about .about-track__list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .page-about .about-track__list a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding-left: 22px;
    position: relative;
    text-decoration: none;
    transition: color 200ms var(--ease);
  }

  .page-about .about-track__list a::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 6px;
    width: 7px;
    height: 7px;
    background: var(--line-blue);
    transform: rotate(45deg);
    transition: background-color 200ms var(--ease);
  }

  .page-about .about-track__list a:hover::before,
  .page-about .about-track__list a:focus-visible::before {
    background: var(--orange);
  }

  .page-about .about-track__num {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
    font-size: 13px;
    font-weight: 700;
    color: var(--navy-mid);
  }

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

  .page-about .about-track__list a:hover .about-track__cap,
  .page-about .about-track__list a:focus-visible .about-track__cap {
    color: var(--orange);
  }

  .page-about .about-figure--wide {
    max-width: 100%;
  }

  .page-about .about-figure--square .media {
    max-width: 520px;
  }
}

@media (min-width: 1200px) {
  .page-about .chapter {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 30px;
  }

  .page-about .chapter__index {
    width: 60px;
    height: 60px;
    font-size: 22px;
  }

  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .page-about .role-card:hover {
    transform: none;
  }
}