.page-about {
  --about-rail-bg: rgba(30, 58, 95, 0.52);
  --about-rail-border: rgba(255, 255, 255, 0.08);
  --about-outline-num: rgba(255, 107, 0, 0.3);
  --about-dot-shadow: rgba(255, 107, 0, 0.16);
  background: var(--c-primary);
  color: var(--c-text);
  font-family: var(--font-body);
  line-height: 1.6;
}

.page-about img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h-mobile) + 16px);
}

/* ========== Hero ========== */
.page-about-hero {
  position: relative;
  padding: 28px 0 40px;
  background:
    radial-gradient(circle at 78% 18%, rgba(255, 107, 0, 0.18) 0%, transparent 34%),
    linear-gradient(155deg, var(--c-primary) 0%, var(--c-footer-bg) 100%);
  overflow: hidden;
  border-bottom: 1px solid var(--c-border);
}

.page-about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -32deg,
    transparent 0 14px,
    rgba(255, 255, 255, 0.035) 14px 15px
  );
  pointer-events: none;
}

.page-about-hero::after {
  content: "8868";
  position: absolute;
  top: 18px;
  right: -14px;
  font-family: var(--font-number);
  font-weight: 800;
  font-size: 76px;
  line-height: 1;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px var(--about-outline-num);
  opacity: 0.9;
  pointer-events: none;
}

.page-about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about-hero__index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-accent);
  margin-bottom: 16px;
}

.page-about-hero__index::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.16);
}

.page-about-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(34px, 7vw, 76px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--c-text-bright);
  margin: 0 0 18px;
}

.page-about-hero__title-accent {
  display: block;
  font-size: 0.58em;
  font-weight: 700;
  color: var(--c-accent);
  margin-top: 10px;
  letter-spacing: -0.01em;
}

.page-about-hero__desc {
  max-width: 46em;
  font-size: 16px;
  color: var(--c-text-dim);
  margin: 0 0 28px;
}

.page-about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ========== Breadcrumb ========== */
.page-about .breadcrumb {
  padding: 16px 0 8px;
  margin: 0;
}

/* ========== Metrics ========== */
.page-about-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.page-about-metrics__item {
  position: relative;
  padding: 26px 18px 22px;
  background: var(--c-primary);
}

.page-about-metrics__dot {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-text-dim);
}

.page-about-metrics__dot--orange {
  background: var(--c-accent);
}

.page-about-metrics__dot--green {
  background: var(--c-success);
}

.page-about-metrics__num {
  display: block;
  font-family: var(--font-number);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--c-text-bright);
}

.page-about-metrics__num--orange {
  color: var(--c-accent);
}

.page-about-metrics__num--green {
  color: var(--c-success);
}

.page-about-metrics__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--c-text-dim);
}

/* ========== Layout ========== */
.page-about-layout {
  display: flex;
  flex-direction: column;
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 64px;
}

.page-about-content {
  min-width: 0;
  flex: 1;
}

/* ========== Rail ========== */
.page-about-rail {
  background: var(--about-rail-bg);
  border: 1px solid var(--about-rail-border);
  border-radius: var(--radius-lg);
  padding: 20px 16px 18px;
}

.page-about-rail__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-about-rail__tag {
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.page-about-rail__tag-line {
  width: 36px;
  height: 1px;
  background: var(--c-border-strong);
}

.page-about-rail__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  list-style: none;
  margin: 16px -8px 0;
  padding: 0 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  color: var(--c-text);
  text-decoration: none;
  white-space: nowrap;
  font-size: 14px;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about-rail__link:hover,
.page-about-rail__link:focus-visible {
  background: rgba(255, 107, 0, 0.14);
  border-color: rgba(255, 107, 0, 0.34);
  color: var(--c-text-bright);
}

.page-about-rail__idx {
  font-family: var(--font-number);
  font-size: 11px;
  color: var(--c-accent);
}

.page-about-rail__foot {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--c-border);
}

/* ========== Blocks ========== */
.page-about-block {
  padding: 44px 0 40px;
  border-bottom: 1px solid var(--c-border);
}

.page-about-block:first-child {
  padding-top: 0;
}

.page-about-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about-block__title {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-text-bright);
  margin: 0;
}

.page-about-block__index {
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-text-dim);
}

.page-about-block__desc {
  font-size: 16px;
  color: var(--c-text-dim);
  margin: 0 0 24px;
  max-width: 56em;
}

/* ========== Story ========== */
.page-about-story {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about-story__lead {
  font-size: 19px;
  line-height: 1.55;
  color: var(--c-text-bright);
  font-weight: 500;
}

.page-about-story__body p {
  margin: 0 0 16px;
}

.page-about-story__visual img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
  object-fit: cover;
}

/* ========== Arch ========== */
.page-about-arch {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 24px;
}

.page-about-arch__item {
  padding: 20px;
  background: linear-gradient(145deg, rgba(30, 58, 95, 0.5) 0%, rgba(13, 27, 42, 0.6) 100%);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about-arch__item:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 107, 0, 0.35);
}

.page-about-arch__step {
  display: inline-block;
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-accent);
  margin-bottom: 12px;
}

.page-about-arch__name {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--c-text-bright);
  margin: 0 0 8px;
}

.page-about-arch__item p {
  margin: 0;
  font-size: 15px;
  color: var(--c-text-dim);
}

.page-about-arch__visual img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
}

/* ========== Milestones ========== */
.page-about-milestones {
  position: relative;
  list-style: none;
  margin: 36px 0 0;
  padding: 0 0 0 24px;
}

.page-about-milestones::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.2) 0 6px,
    transparent 6px 12px
  );
}

.page-about-milestones__item {
  position: relative;
  padding: 0 0 30px 24px;
}

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

.page-about-milestones__item::before {
  content: "";
  position: absolute;
  top: 2px;
  left: -24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-primary);
  border: 3px solid var(--c-accent);
  box-shadow: 0 0 0 2px var(--about-dot-shadow);
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about-milestones__item:nth-child(2n)::before {
  border-color: var(--c-success);
  box-shadow: 0 0 0 2px rgba(0, 230, 118, 0.16);
}

.page-about-milestones__item:hover::before {
  transform: scale(1.18);
  background: var(--c-accent);
}

.page-about-milestones__year {
  display: block;
  font-family: var(--font-number);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-accent);
  margin-bottom: 4px;
}

.page-about-milestones__item:nth-child(2n) .page-about-milestones__year {
  color: var(--c-success);
}

.page-about-milestones__body h3 {
  font-family: var(--font-heading);
  font-size: 19px;
  color: var(--c-text-bright);
  margin: 0 0 6px;
}

.page-about-milestones__body p {
  margin: 0;
  font-size: 15px;
  color: var(--c-text-dim);
}

.page-about-milestones__visual {
  margin-top: 28px;
}

.page-about-milestones__visual img {
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
}

/* ========== Eco ========== */
.page-about-eco {
  display: grid;
  gap: 16px;
}

.page-about-eco__item {
  position: relative;
  padding: 28px 24px;
  background: linear-gradient(145deg, rgba(30, 58, 95, 0.52) 0%, rgba(13, 27, 42, 0.7) 100%);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about-eco__item::after {
  content: "";
  position: absolute;
  right: -28px;
  top: -28px;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  border: 18px solid rgba(255, 107, 0, 0.08);
}

.page-about-eco__item:nth-child(2)::after {
  border-color: rgba(0, 230, 118, 0.08);
}

.page-about-eco__num {
  display: block;
  font-family: var(--font-number);
  font-size: clamp(36px, 6vw, 52px);
  font-weight: 800;
  line-height: 1;
  color: var(--c-accent);
  margin-bottom: 12px;
}

.page-about-eco__item:nth-child(2) .page-about-eco__num {
  color: var(--c-success);
}

.page-about-eco__name {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--c-text-bright);
  margin: 0 0 8px;
}

.page-about-eco__item p {
  margin: 0;
  font-size: 15px;
  color: var(--c-text-dim);
}

/* ========== Callout ========== */
.page-about-callout {
  margin-top: 40px;
  padding: 36px 24px;
  background:
    linear-gradient(145deg, rgba(255, 107, 0, 0.14) 0%, rgba(0, 230, 118, 0.06) 60%),
    var(--c-footer-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
}

.page-about-callout__title {
  font-family: var(--font-heading);
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  color: var(--c-text-bright);
  margin: 0 0 10px;
}

.page-about-callout p {
  margin: 0 0 22px;
  color: var(--c-text-dim);
}

.page-about-callout__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about-callout__btn {
  border-color: var(--c-border-strong);
}

/* ========== Tablet ========== */
@media (min-width: 720px) {
  .page-about-story {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

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

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

/* ========== Desktop ========== */
@media (min-width: 800px) {
  .page-about-hero {
    padding: 64px 0 56px;
  }

  .page-about-hero__title {
    font-size: clamp(48px, 7vw, 76px);
  }

  .page-about-hero__desc {
    font-size: 17px;
    max-width: 44em;
  }

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

  .page-about-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 44px;
    padding-top: 56px;
  }

  .page-about-rail {
    width: 240px;
    flex-shrink: 0;
    position: sticky;
    top: 20px;
    padding: 24px 16px 20px;
  }

  .page-about-rail__list {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    overflow: visible;
  }

  .page-about-rail__link {
    white-space: normal;
    justify-content: flex-start;
    width: 100%;
  }

  .page-about-content {
    flex: 1;
  }

  .page-about [id] {
    scroll-margin-top: 20px;
  }
}

/* ========== Wide ========== */
@media (min-width: 980px) {
  .page-about-arch {
    grid-template-columns: repeat(4, 1fr);
  }
}