.page-about {
  --about-ink: #12151c;
  --about-violet: #241b34;
  --about-line: rgba(255, 255, 255, 0.16);
  background: var(--page-base);
  color: var(--text-main);
}

.page-about__layout {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-4) var(--container-pad) var(--space-6);
}

.about-side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.about-side__block {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.about-side__block--total {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--accent-red), #ff6a3d);
  border: 0;
  color: #fff;
  box-shadow: var(--shadow-md);
}

.about-side__block--status {
  grid-column: 1 / -1;
}

.about-side__eyebrow {
  display: block;
  font-size: var(--font-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  opacity: 0.85;
}

.about-side__number {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(40px, 8vw, 68px);
  line-height: 1;
  margin: var(--space-2) 0;
  font-weight: 900;
}

.about-side__note {
  display: block;
  font-size: var(--font-xs);
  opacity: 0.85;
  margin-bottom: var(--space-3);
}

.about-side__heading {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--font-md);
  font-weight: 900;
}

.about-side__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.about-side__chip {
  font-size: var(--font-xs);
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 999px;
  text-decoration: none;
  color: var(--text-inverse);
}

.about-side__chip--sun {
  background: var(--sun-block);
}

.about-side__chip--forest {
  background: var(--forest-block);
  color: var(--text-main);
}

.about-side__chip--midnight {
  background: var(--midnight-block);
  color: var(--text-main);
}

.about-side__chip--lavender {
  background: var(--card-lavender);
}

.about-side__chip--cyan {
  background: var(--card-cyan);
}

.about-side__status {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  font-size: var(--font-sm);
}

.about-side__status b {
  color: var(--text-main);
  font-weight: 700;
}

.about-side__status span {
  color: rgba(255, 255, 255, 0.65);
}

.about-side__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.about-side__nav a {
  padding: 8px 14px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  color: var(--text-main);
  text-decoration: none;
  font-size: var(--font-xs);
  font-weight: 700;
}

.about-side__nav a:hover {
  border-color: var(--accent-neon);
  color: var(--accent-neon);
}

.about-main {
  min-width: 0;
}

.page-about .breadcrumb {
  margin: 0 0 var(--space-4);
  font-size: var(--font-xs);
  color: rgba(255, 255, 255, 0.55);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .breadcrumb a {
  color: var(--text-main);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--accent-neon);
}

.page-about .breadcrumb__sep {
  margin: 0 var(--space-2);
  opacity: 0.6;
}

.about-hero {
  margin-bottom: var(--space-5);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--about-line);
}

.about-hero__eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--accent-neon);
  font-size: var(--font-xs);
  font-weight: 900;
  letter-spacing: 0.14em;
}

.about-hero h1 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.1;
  font-weight: 900;
  color: var(--text-main);
}

.about-hero__lead {
  max-width: 68ch;
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
  font-size: var(--font-md);
  line-height: 1.8;
}

.about-section {
  position: relative;
  padding: clamp(20px, 4vw, 40px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
}

.about-section + .about-section {
  margin-top: var(--space-5);
}

.about-section__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-3);
  border-bottom: 1px solid var(--about-line);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
}

.about-section__num {
  font-family: var(--font-heading);
  font-size: var(--font-2xl);
  font-weight: 900;
  line-height: 1;
  color: var(--accent-neon);
}

.about-section__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 900;
  color: var(--text-main);
}

.about-section__desc {
  margin: var(--space-2) 0 0;
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-sm);
}

.about-intro {
  background: var(--page-base);
  box-shadow: inset 0 0 60px rgba(255, 140, 66, 0.05);
}

.about-intro__grid {
  display: grid;
  gap: var(--space-4);
}

.about-intro__text p {
  margin-top: 0;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.8);
}

.about-intro__text .btn {
  margin-top: var(--space-2);
}

.about-scope {
  background: var(--about-ink);
}

.about-scope__hero {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.about-scope__hero-card {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  box-shadow: var(--shadow-md);
}

.about-scope__hero-card span {
  font-size: var(--font-xs);
  font-weight: 900;
  letter-spacing: 0.08em;
  opacity: 0.85;
}

.about-scope__hero-card strong {
  font-family: var(--font-heading);
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1;
  font-weight: 900;
}

.about-scope__hero-card small {
  font-size: var(--font-xs);
  opacity: 0.75;
}

.about-scope__hero-card--red {
  background: var(--accent-red);
  color: #fff;
}

.about-scope__hero-card--yellow {
  background: var(--card-yellow);
  color: var(--text-inverse);
}

.about-stat-block {
  margin-top: var(--space-4);
}

.about-stat-block__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--font-lg);
  font-weight: 900;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.about-stat-block__title::before {
  content: "";
  width: 6px;
  height: 16px;
  background: var(--accent-neon);
  border-radius: 3px;
}

.about-card-rows {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.about-card {
  position: relative;
  min-height: 104px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.about-card__label {
  font-size: var(--font-xs);
  font-weight: 900;
  letter-spacing: 0.08em;
}

.about-card__value {
  font-family: var(--font-heading);
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.1;
  font-weight: 900;
}

.about-card__unit {
  font-size: var(--font-xs);
  opacity: 0.75;
}

.about-card__badge {
  position: absolute;
  top: 10px;
  right: 10px;
}

.about-card--sun {
  background: var(--sun-block);
  color: var(--text-inverse);
}

.about-card--midnight {
  background: var(--midnight-block);
  color: var(--text-main);
}

.about-card--yellow {
  background: var(--card-yellow);
  color: var(--text-inverse);
}

.about-card--lavender {
  background: var(--card-lavender);
  color: var(--text-inverse);
}

.about-card--forest {
  background: var(--forest-block);
  color: var(--text-main);
}

.about-card--cyan {
  background: var(--card-cyan);
  color: var(--text-inverse);
}

.about-taxonomy {
  background: var(--midnight-block);
  border-color: rgba(255, 255, 255, 0.12);
}

.about-taxonomy__grid {
  display: grid;
  gap: var(--space-4);
  align-items: start;
}

.about-tree {
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.28);
  padding: var(--space-4);
}

.about-tree__root {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.about-tree__root b {
  color: var(--accent-neon);
  font-size: var(--font-xl);
  font-family: var(--font-heading);
  font-weight: 900;
}

.about-tree__branches {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
}

.about-tree__branch {
  position: relative;
  padding: 8px 0 8px 26px;
}

.about-tree__branch::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 16px;
  bottom: 14px;
  width: 1px;
  background: rgba(255, 255, 255, 0.18);
}

.about-tree__branch-title {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  line-height: 1.6;
}

.about-tree__branch-title a {
  color: var(--text-main);
  text-decoration: none;
}

.about-tree__branch-title a:hover {
  color: var(--accent-neon);
}

.about-tree__dot {
  position: absolute;
  left: -26px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.about-tree__dot--sun {
  background: var(--sun-block);
  box-shadow: 0 0 0 3px rgba(255, 140, 66, 0.2);
}

.about-tree__dot--cyan {
  background: var(--card-cyan);
  box-shadow: 0 0 0 3px rgba(0, 191, 255, 0.2);
}

.about-tree__dot--lavender {
  background: var(--card-lavender);
  box-shadow: 0 0 0 3px rgba(181, 126, 220, 0.2);
}

.about-tree__dot--neon {
  background: var(--accent-neon);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.2);
}

.about-tree__dot--red {
  background: var(--accent-red);
  box-shadow: 0 0 0 3px rgba(255, 46, 77, 0.2);
}

.about-tree__root .about-tree__dot {
  position: static;
  transform: none;
}

.about-tree__leaves {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.about-tree__leaves li {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 7px 12px;
  border-radius: 999px;
  font-size: var(--font-xs);
  font-weight: 600;
}

.about-tree__leaves b {
  color: var(--accent-neon);
  font-size: var(--font-md);
  font-weight: 900;
  margin-left: 6px;
}

.about-tree__fold {
  margin-top: var(--space-2);
}

.about-tree__fold summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-weight: 700;
  color: var(--text-main);
}

.about-tree__fold summary::-webkit-details-marker {
  display: none;
}

.about-tree__fold-mark {
  display: inline-block;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  text-align: center;
  line-height: 20px;
  color: var(--accent-neon);
  font-weight: 900;
  transition: transform 0.2s ease;
}

.about-tree__fold[open] .about-tree__fold-mark {
  transform: rotate(45deg);
}

.about-tree__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.about-tree__tags .tag-pill {
  white-space: normal;
}

.about-updates {
  background: var(--forest-block);
  border-color: rgba(255, 255, 255, 0.1);
}

.about-updates__lead {
  color: rgba(255, 255, 255, 0.8);
  margin: 0 0 var(--space-4);
  max-width: 70ch;
  line-height: 1.8;
}

.about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.about-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 5px;
  width: 2px;
  background: rgba(255, 255, 255, 0.2);
}

.about-timeline__item {
  position: relative;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  padding-left: 40px;
}

.about-timeline__dot {
  position: absolute;
  left: 12px;
  top: 16px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sun-block);
  box-shadow: 0 0 0 3px rgba(255, 140, 66, 0.25);
}

.about-timeline__item h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--font-lg);
  font-weight: 900;
}

.about-timeline__item p {
  margin: 0;
  font-size: var(--font-sm);
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.8;
}

.about-timeline__item--current {
  border-color: var(--accent-neon);
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.1);
}

.about-timeline__item--current h3 {
  color: var(--accent-neon);
}

.about-timeline__item--current .about-timeline__dot {
  background: var(--accent-neon);
  box-shadow: 0 0 14px rgba(57, 255, 20, 0.7);
}

.about-timeline__item--past {
  opacity: 0.75;
}

.about-timeline__item--next .about-timeline__dot {
  background: var(--card-lavender);
  opacity: 0.8;
}

.about-updates > .btn {
  margin-top: var(--space-2);
}

.about-terminal {
  background: var(--about-violet);
  border-color: rgba(255, 255, 255, 0.12);
}

.about-terminal__grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.about-terminal__table-wrap {
  overflow-x: auto;
}

.page-about .compare-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: var(--font-sm);
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
}

.page-about .compare-table th,
.page-about .compare-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--about-line);
  vertical-align: top;
}

.page-about .compare-table th {
  background: rgba(0, 0, 0, 0.3);
  font-family: var(--font-heading);
  color: var(--text-main);
  letter-spacing: 0.04em;
  font-weight: 900;
}

.page-about .compare-table td:first-child {
  font-weight: 700;
  white-space: nowrap;
}

.page-about .compare-table tr:last-child td {
  border-bottom: 0;
}

.about-figure {
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
}

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

.about-figure--intro img,
.about-figure--tree img {
  width: 100%;
}

@media (min-width: 700px) {
  .about-card-rows {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }

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

  .about-side__block--total,
  .about-side__block--status {
    grid-column: 1 / -1;
  }
}

@media (min-width: 820px) {
  .about-timeline {
    flex-direction: row;
    justify-content: space-between;
  }

  .about-timeline::before {
    top: 5px;
    bottom: auto;
    left: 8%;
    right: 8%;
    width: auto;
    height: 2px;
  }

  .about-timeline__item {
    flex: 1;
    padding-top: 28px;
    padding-left: var(--space-4);
  }

  .about-timeline__dot {
    top: 12px;
    left: calc(var(--space-4) - 1px);
  }
}

@media (min-width: 900px) {
  .about-intro__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .about-taxonomy__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .about-terminal__grid {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    align-items: start;
  }

  .about-terminal__grid .about-figure--device {
    order: 2;
  }

  .about-terminal__table-wrap {
    order: 1;
  }
}

@media (min-width: 1024px) {
  .page-about__layout {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
    gap: var(--space-5);
    align-items: start;
  }

  .about-side {
    position: sticky;
    top: var(--space-4);
    display: block;
    margin-bottom: 0;
  }

  .about-side__block + .about-side__block {
    margin-top: var(--space-3);
  }

  .about-side__block--total,
  .about-side__block--status {
    grid-column: auto;
  }
}