.page-about {
  --about-bg-deep: #14161A;
  --about-bg-panel: #1E232B;
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about__shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px 64px;
}

.page-about .breadcrumb {
  padding: 20px 0 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

.page-about .breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.page-about__hero {
  position: relative;
  padding: 28px 0 36px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about__hero::before {
  content: "GUIDE";
  position: absolute;
  right: -10px;
  top: 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 68px;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.1);
  pointer-events: none;
  z-index: 0;
  letter-spacing: -0.04em;
}

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

.page-about__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--neon);
  margin: 0 0 8px;
}

.page-about__hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 30px;
  line-height: 1.18;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
  max-width: 16em;
}

.page-about__lede {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 58ch;
  margin: 0;
}

.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.page-about__hero-tag {
  display: inline-block;
  background: var(--yellow);
  color: #14161A;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 5px 16px 5px 10px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about__hero-tag--neon {
  background: var(--neon);
}

.page-about__scope,
.page-about__sections,
.page-about__versions,
.page-about__devices,
.page-about__feedback {
  margin-left: -16px;
  margin-right: -16px;
  padding-left: 16px;
  padding-right: 16px;
}

.page-about__scope {
  margin-top: 28px;
  padding-top: 28px;
  padding-bottom: 40px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    var(--bg-purple);
  background-size: 22px 22px;
  border-left: 4px solid var(--neon);
}

.page-about .section-heading {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  padding-bottom: 10px;
  margin-bottom: 22px;
}

.page-about .section-heading__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-about .section-heading__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  margin: 0;
  line-height: 1.25;
}

.page-about__scope-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
}

.page-about__scope-figure {
  margin: 0;
  position: relative;
}

.page-about__scope-figure img {
  width: 100%;
  max-width: 320px;
  height: auto;
  display: block;
  border: 2px solid var(--yellow);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.32);
  transform: rotate(-1.4deg);
}

.page-about__scope-text p {
  margin: 0 0 12px;
  font-size: 15px;
  color: rgba(242, 242, 242, 0.9);
}

.page-about__scope-text strong {
  color: var(--yellow);
  font-weight: 700;
}

.page-about__search-methods {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about__method-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--neon);
  margin-bottom: 10px;
}

.page-about__method-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about__method {
  display: inline-block;
  font-size: 13px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-main);
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-about__method:hover {
  background: var(--yellow);
  border-color: var(--yellow);
  color: #14161A;
}

.page-about__sections {
  margin-top: 24px;
  padding-top: 28px;
  padding-bottom: 40px;
  background: #1B1E26;
  border: 1px solid var(--line);
  border-left: 4px solid var(--bright-yellow);
}

.page-about__section-grid {
  margin-top: 4px;
}

.page-about .tile-item {
  position: relative;
  min-height: 102px;
  color: #ffffff;
  transition: filter 0.2s ease, transform 0.2s ease;
}

.page-about .tile-item:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

.page-about .tile-item--yellow,
.page-about .tile-item--neon {
  color: #14161A;
}

.page-about .tile-item__count {
  position: absolute;
  top: 12px;
  right: 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about__tile-link {
  display: block;
  height: 100%;
  min-height: 102px;
  text-decoration: none;
  color: inherit;
  box-sizing: border-box;
  padding: 6px 38px 6px 4px;
}

.page-about__tile-desc {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  opacity: 0.78;
  max-width: 22ch;
}

.page-about .tile-item--yellow .page-about__tile-desc,
.page-about .tile-item--neon .page-about__tile-desc {
  opacity: 0.7;
}

.page-about__tile-hint {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about .tile-item:hover .page-about__tile-hint,
.page-about .tile-item:focus-within .page-about__tile-hint {
  opacity: 0.9;
  transform: translateY(0);
}

.page-about__versions {
  margin-top: 24px;
  padding-top: 28px;
  padding-bottom: 40px;
  background: var(--bg-green);
  border-left: 4px solid var(--bright-yellow);
  position: relative;
  overflow: hidden;
}

.page-about__versions::after {
  content: "";
  position: absolute;
  right: -46px;
  top: -46px;
  width: 140px;
  height: 140px;
  background: var(--neon);
  opacity: 0.14;
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about__versions-band {
  display: block;
  max-width: 100%;
  width: 100%;
  height: auto;
  margin: 6px 0 26px;
  border: 1px solid rgba(255, 255, 255, 0.24);
}

.page-about__timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin: 0 0 26px;
  padding-left: 24px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--neon);
}

.page-about__milestone {
  position: relative;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-bottom: 3px solid var(--neon);
  padding: 16px 18px;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--neon);
  border: 2px solid var(--bg-green);
  transform: rotate(45deg);
  box-sizing: border-box;
}

.page-about__milestone-batch {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-about__milestone-ver {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 26px;
  color: var(--bright-yellow);
  margin: 4px 0 8px;
}

.page-about__milestone p {
  margin: 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.84);
}

.page-about__milestone-flag {
  display: inline-block;
  margin-top: 10px;
  background: var(--bright-yellow);
  color: #14161A;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
}

.page-about__versions .panel-block {
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.14);
  margin-bottom: 12px;
}

.page-about__versions .panel-block summary {
  color: var(--text-main);
  font-weight: 700;
  font-size: 15px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about__versions .panel-block summary::-webkit-details-marker {
  display: none;
}

.page-about__versions .panel-block__content {
  padding: 0 16px 16px;
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.page-about__versions .panel-block__content p {
  margin: 0;
}

.page-about__devices {
  margin-top: 24px;
  padding-top: 28px;
  padding-bottom: 40px;
  background: var(--bg-orange);
  border-left: 4px solid var(--blue);
}

.page-about__devices-art {
  display: block;
  max-width: 100%;
  width: 100%;
  height: auto;
  margin: 6px 0 26px;
  border: 2px solid var(--yellow);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.3);
  transform: rotate(0.6deg);
}

.page-about__device-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__device-card {
  background: rgba(0, 0, 0, 0.3);
  border-top: 3px solid var(--blue);
  padding: 16px;
}

.page-about__device-card--desktop {
  border-top-color: var(--yellow);
}

.page-about__device-card--tablet {
  border-top-color: var(--coral);
}

.page-about__device-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text-main);
}

.page-about__device-card p {
  margin: 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
}

.page-about__device-note {
  margin: 22px 0 0;
  padding: 12px 14px;
  font-size: 14px;
  color: var(--text-secondary);
  background: rgba(0, 0, 0, 0.24);
  border-left: 3px solid var(--neon);
}

.page-about__feedback {
  margin-top: 24px;
  padding-top: 28px;
  padding-bottom: 40px;
  background:
    linear-gradient(135deg, transparent 0%, transparent 92%, rgba(255, 230, 77, 0.2) 100%),
    var(--bg-panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--coral);
}

.page-about__feedback-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about__feedback-item {
  background: var(--about-bg-deep);
  border-left: 4px solid var(--yellow);
  padding: 16px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about__feedback-item:nth-child(2) {
  border-left-color: var(--neon);
}

.page-about__feedback-item:nth-child(3) {
  border-left-color: var(--blue);
}

.page-about__feedback-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 26px;
  line-height: 1.2;
  color: var(--bright-yellow);
}

.page-about__feedback-label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.page-about__feedback-more {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.page-about__feedback-more a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 255, 0, 0.4);
}

.page-about__feedback-more a:hover {
  color: var(--bright-yellow);
  border-bottom-color: var(--bright-yellow);
}

.page-about a:focus-visible {
  outline: 2px solid var(--bright-yellow);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }

  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}

@media (min-width: 760px) {
  .page-about__device-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-about__hero h1 {
    font-size: 38px;
  }
}

@media (min-width: 960px) {
  .page-about__shell {
    padding-left: 32px;
    padding-right: 32px;
  }

  .page-about__scope,
  .page-about__sections,
  .page-about__versions,
  .page-about__devices,
  .page-about__feedback {
    margin-left: -32px;
    margin-right: -32px;
    padding-left: 32px;
    padding-right: 32px;
  }

  .page-about__hero {
    padding: 40px 0 48px;
  }

  .page-about__hero::before {
    font-size: 122px;
    right: 0;
    top: 4px;
  }

  .page-about__hero h1 {
    font-size: 44px;
  }

  .page-about__lede {
    font-size: 16px;
    max-width: 60ch;
  }

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

  .page-about__scope-grid {
    grid-template-columns: 320px 1fr;
    gap: 44px;
  }

  .page-about__scope-figure {
    transform: translateY(14px);
  }

  .page-about__scope-figure img {
    transform: rotate(-2deg) translateX(10px);
  }

  .page-about__scope-text p {
    font-size: 15.5px;
  }

  .page-about__timeline {
    flex-direction: row;
    gap: 24px;
    padding-left: 0;
  }

  .page-about__timeline::before,
  .page-about__milestone::before {
    display: none;
  }

  .page-about__milestone {
    flex: 1;
  }

  .page-about__versions-band {
    width: 100%;
  }

  .page-about__devices-art {
    width: 100%;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about__device-note {
    max-width: 720px;
  }
}