.page-about {
  background: var(--color-space);
  color: var(--color-cloud);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-headings);
}

.page-about h2 {
  font-size: var(--text-section);
  line-height: 1.2;
  margin: 0 0 18px;
  color: var(--color-cloud);
  letter-spacing: 0.02em;
}

.page-about .coordinate,
.page-about .kicker {
  color: var(--color-gold);
}

.page-about #about-origin,
.page-about #about-timeline,
.page-about #about-system,
.page-about #about-cert {
  scroll-margin-top: calc(var(--header-zone) + 16px);
}

/* Hero */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: clamp(560px, 88vh, 980px);
  padding-top: var(--header-zone);
  overflow: hidden;
  background: var(--color-space);
  border-bottom: 2px solid rgba(212, 175, 55, 0.45);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 28%;
  opacity: 0.46;
}

.page-about .about-hero__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 12, 26, 0.78) 0%, rgba(10, 31, 68, 0.4) 42%, rgba(5, 12, 26, 0.92) 100%);
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 240, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.06) 1px, transparent 1px);
  background-size: 54px 54px;
  transform: perspective(420px) rotateX(38deg) scale(1.5);
  transform-origin: bottom center;
  opacity: 0.6;
  mix-blend-mode: screen;
}

.page-about .about-hero__story {
  position: absolute;
  top: calc(var(--header-zone) - 8px);
  right: var(--page-gutter);
  margin: 0;
  font-family: var(--font-headings);
  font-size: clamp(4.8rem, 15vw, 12rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: 0.06em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(212, 175, 55, 0.5);
  text-shadow: 0 0 28px rgba(255, 107, 53, 0.2);
  user-select: none;
  pointer-events: none;
  z-index: 1;
}

.page-about .about-hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 180px var(--page-gutter) 72px;
}

.page-about .about-hero__title {
  font-size: var(--text-hero);
  line-height: 1.06;
  margin: 16px 0 14px;
  color: var(--color-white);
  letter-spacing: 0.04em;
  text-shadow: 0 4px 30px rgba(5, 12, 26, 0.9);
}

.page-about .about-hero__slogan {
  display: inline-block;
  font-family: var(--font-headings);
  font-size: clamp(1.25rem, 2.6vw, 2rem);
  letter-spacing: 0.18em;
  margin: 0 0 22px;
  padding: 8px 16px;
  color: var(--color-gold);
  border-left: 4px solid var(--color-neon);
  background: rgba(5, 12, 26, 0.5);
}

.page-about .about-hero__desc {
  max-width: 680px;
  margin: 0;
  font-size: var(--text-sub);
  line-height: 1.7;
  color: var(--color-cloud);
}

.page-about .about-hero__index {
  margin-top: 34px;
}

/* Breadcrumb */
.page-about .breadcrumb {
  position: relative;
  z-index: 3;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 20px var(--page-gutter) 0;
}

/* Origin */
.page-about .about-origin {
  position: relative;
  padding: 96px var(--page-gutter) 80px;
  background: linear-gradient(180deg, var(--color-space) 0%, var(--color-midnight) 100%);
  overflow: hidden;
}

.page-about .about-origin__wave {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 240px;
  pointer-events: none;
}

.page-about .about-origin__wave svg {
  width: 100%;
  height: 100%;
}

.page-about .about-origin__shell {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 56px;
  max-width: var(--content-width);
  margin: 0 auto;
}

.page-about .about-origin__intro p {
  margin: 0 0 18px;
  font-size: var(--text-body);
  line-height: 1.8;
  color: var(--color-cloud);
}

.page-about .about-origin__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  padding: 20px;
  border: 2px solid rgba(212, 175, 55, 0.5);
  background: rgba(5, 12, 26, 0.4);
  box-shadow: var(--shadow-hard);
  transform: rotate(-1.2deg);
}

.page-about .about-origin__fact {
  padding: 14px;
  border: 1px solid rgba(212, 175, 55, 0.18);
  background: rgba(10, 31, 68, 0.38);
}

.page-about .about-origin__fact:nth-child(2) {
  transform: translateY(8px);
}

.page-about .about-origin__num {
  margin: 0 0 8px;
  font-family: var(--font-headings);
  font-size: var(--text-section);
  color: var(--color-gold);
}

.page-about .about-origin__note {
  margin: 0;
  font-size: var(--text-small);
  line-height: 1.6;
  color: var(--color-frost);
  border-top: 1px solid rgba(212, 175, 55, 0.24);
  padding-top: 8px;
}

/* Timeline */
.page-about .about-timeline {
  position: relative;
  padding: 96px var(--page-gutter);
  background: var(--color-deep);
}

.page-about .about-timeline__header {
  max-width: var(--content-width);
  margin: 0 auto 64px;
}

.page-about .about-timeline__header p {
  max-width: 760px;
  margin: 0;
  font-size: var(--text-body);
  line-height: 1.8;
  color: var(--color-frost);
}

.page-about .about-timeline__rail {
  position: relative;
  display: grid;
  gap: 28px;
  max-width: 820px;
  margin: 0 auto;
}

.page-about .about-timeline__rail::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 10px;
  bottom: 10px;
  width: 4px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-neon) 100%);
  box-shadow: 0 0 16px rgba(212, 175, 55, 0.28);
}

.page-about .about-version {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 0;
  position: relative;
}

.page-about .about-version::before {
  content: "";
  justify-self: center;
  align-self: start;
  margin-top: 24px;
  width: 18px;
  height: 18px;
  transform: rotate(45deg);
  background: var(--color-deep);
  border: 3px solid var(--color-gold);
  box-shadow: 0 0 12px rgba(255, 107, 53, 0.38);
  z-index: 1;
}

.page-about .about-version__box {
  min-width: 0;
  border: 2px solid rgba(212, 175, 55, 0.42);
  border-radius: var(--radius);
  background: var(--color-midnight);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.2s ease;
}

.page-about .about-version__box[open] {
  border-color: rgba(255, 107, 53, 0.7);
}

.page-about .about-version__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius);
  transition: background 0.2s ease;
}

.page-about .about-version__head::-webkit-details-marker {
  display: none;
}

.page-about .about-version__box[open] .about-version__head {
  border-bottom: 1px solid rgba(212, 175, 55, 0.18);
  border-radius: var(--radius) var(--radius) 0 0;
}

.page-about .about-version__head:hover {
  background: rgba(212, 175, 55, 0.05);
}

.page-about .about-version__tag {
  font-family: var(--font-headings);
  font-size: 1.05rem;
  color: var(--color-gold);
  white-space: nowrap;
  padding: 4px 10px;
  border: 1px solid rgba(212, 175, 55, 0.45);
  border-radius: 4px;
  background: rgba(212, 175, 55, 0.1);
}

.page-about .about-version__name {
  flex: 1;
  font-family: var(--font-headings);
  font-size: clamp(1rem, 2vw, 1.2rem);
  letter-spacing: 0.04em;
  color: var(--color-cloud);
}

.page-about .about-version__plus::before {
  content: "+";
  display: block;
  width: 28px;
  height: 28px;
  line-height: 24px;
  text-align: center;
  border: 1px solid var(--color-neon);
  border-radius: 50%;
  color: var(--color-neon);
  font-weight: 700;
}

.page-about .about-version__box[open] .about-version__plus::before {
  content: "−";
}

.page-about .about-version__body {
  padding: 16px 22px 22px;
}

.page-about .about-version__body p {
  margin: 0;
  font-size: var(--text-body);
  line-height: 1.8;
  color: var(--color-frost);
}

.page-about .about-timeline__figure {
  max-width: 1000px;
  margin: 72px auto 0;
  border: 2px solid rgba(212, 175, 55, 0.4);
  border-radius: var(--radius);
  background: var(--color-deep);
  box-shadow: var(--shadow-slab);
  overflow: hidden;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-timeline__figure figcaption {
  padding: 14px 18px;
  font-size: var(--text-small);
  color: var(--color-frost);
  border-top: 1px solid rgba(212, 175, 55, 0.2);
}

/* System */
.page-about .about-system {
  padding: 96px var(--page-gutter);
  background: var(--color-space);
}

.page-about .about-system__head {
  max-width: var(--content-width);
  margin: 0 auto 48px;
}

.page-about .about-system__head p {
  max-width: 720px;
  margin: 0;
  font-size: var(--text-body);
  line-height: 1.8;
  color: var(--color-frost);
}

.page-about .about-system__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  max-width: var(--content-width);
  margin: 0 auto;
}

.page-about .about-system__card {
  position: relative;
  padding: 28px;
  border: 2px solid rgba(212, 175, 55, 0.32);
  border-radius: var(--radius);
  background: var(--color-midnight);
  box-shadow: var(--shadow-hard);
}

.page-about .about-system__card:nth-child(3) {
  transform: rotate(0.6deg);
}

.page-about .about-system__card:nth-child(5) {
  transform: rotate(-0.8deg);
}

.page-about .about-system__num {
  display: inline-block;
  margin-bottom: 18px;
  font-family: var(--font-headings);
  font-size: 1.3rem;
  color: var(--color-neon);
  border-bottom: 2px solid var(--color-neon);
  padding-bottom: 4px;
}

.page-about .about-system__card h3 {
  margin: 0 0 12px;
  font-size: 1.3rem;
  color: var(--color-gold);
}

.page-about .about-system__card p {
  margin: 0;
  font-size: var(--text-body);
  line-height: 1.75;
  color: var(--color-frost);
}

.page-about .about-system__address {
  margin-top: 16px !important;
  padding-top: 14px;
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  font-size: var(--text-small);
  color: var(--color-frost);
}

/* Mission */
.page-about .about-mission {
  display: grid;
  gap: 44px;
  padding: 96px var(--page-gutter);
  background: linear-gradient(135deg, var(--color-midnight) 0%, var(--color-space) 100%);
}

.page-about .about-mission__visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid rgba(212, 175, 55, 0.4);
  border-radius: var(--radius);
  box-shadow: var(--shadow-slab);
}

.page-about .about-mission__content .legend {
  padding: 16px 0;
  border-bottom: 1px solid rgba(212, 175, 55, 0.22);
}

.page-about .about-mission__content .legend:last-child {
  border-bottom: 0;
}

.page-about .about-mission__content .legend__title {
  margin: 0 0 10px;
  font-family: var(--font-headings);
  font-size: 1.35rem;
  color: var(--color-gold);
}

.page-about .about-mission__content .legend__row {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
}

.page-about .about-mission__content .legend__key {
  font-family: var(--font-headings);
  font-size: 0.94rem;
  color: var(--color-neon);
}

.page-about .about-mission__content .legend__row p {
  margin: 0;
  font-size: var(--text-body);
  line-height: 1.7;
  color: var(--color-frost);
}

/* Cert */
.page-about .about-cert {
  position: relative;
  padding: 96px var(--page-gutter);
  background: radial-gradient(ellipse at 82% 0%, rgba(212, 175, 55, 0.2), transparent 48%), var(--color-deep);
  border-top: 2px solid rgba(212, 175, 55, 0.45);
  border-bottom: 2px solid rgba(212, 175, 55, 0.25);
}

.page-about .about-cert__inner {
  display: grid;
  gap: 40px;
  max-width: var(--content-width);
  margin: 0 auto;
}

.page-about .about-cert h2 {
  color: var(--color-gold);
}

.page-about .about-cert__text p {
  font-size: var(--text-body);
  line-height: 1.8;
  color: var(--color-cloud);
}

.page-about .about-cert__list {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cert__list li {
  position: relative;
  padding-left: 24px;
  font-size: var(--text-body);
  line-height: 1.7;
  color: var(--color-frost);
}

.page-about .about-cert__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  background: var(--color-neon);
}

.page-about .about-cert__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.page-about .about-cert__seal {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: min(230px, 72vw);
  aspect-ratio: 1;
  border: 2px solid var(--color-gold);
  border-radius: 50%;
  padding: 18px;
  text-align: center;
  background: radial-gradient(circle at 35% 28%, rgba(212, 175, 55, 0.24), rgba(5, 12, 26, 0.92) 72%);
  box-shadow: var(--shadow-slab), 0 0 36px rgba(212, 175, 55, 0.16);
  margin: 0 auto;
}

.page-about .about-cert__seal-mark {
  font-family: var(--font-headings);
  font-size: 4rem;
  line-height: 1;
  color: var(--color-gold);
}

.page-about .about-cert__seal-label {
  margin: 8px 0 4px;
  font-size: var(--text-small);
  letter-spacing: 0.16em;
  color: var(--color-cloud);
}

.page-about .about-cert__seal-id {
  font-size: var(--text-small);
  color: var(--color-neon);
  word-break: break-word;
  max-width: 160px;
}

/* Explore */
.page-about .about-explore {
  padding: 96px var(--page-gutter);
  background: var(--color-space);
}

.page-about .about-explore__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  text-align: center;
}

.page-about .about-explore__inner h2 {
  margin-bottom: 12px;
}

.page-about .about-explore__inner > p {
  margin: 0 auto;
  max-width: 640px;
  font-size: var(--text-body);
  line-height: 1.8;
  color: var(--color-frost);
}

.page-about .about-explore__index {
  justify-content: center;
  margin-top: 30px;
}

.page-about .about-explore__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: 36px;
}

/* Tablet */
@media (min-width: 720px) {
  .page-about .about-origin__shell {
    grid-template-columns: 1fr 0.9fr;
    align-items: center;
    gap: 48px;
  }

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

  .page-about .about-version__tag {
    font-size: 1.2rem;
  }

  .page-about .about-system__grid {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }

  .page-about .about-system__card--wide {
    grid-column: span 4;
  }

  .page-about .about-system__card--spot {
    grid-column: span 2;
  }

  .page-about .about-system__card--half {
    grid-column: span 4;
  }

  .page-about .about-mission {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .about-cert__inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

  .page-about .about-cert__seal {
    margin: 0;
    justify-self: end;
  }
}

/* Desktop */
@media (min-width: 1080px) {
  .page-about .about-hero__content {
    padding-top: 220px;
  }

  .page-about .about-origin {
    padding-top: 110px;
    padding-bottom: 110px;
  }

  .page-about .about-origin__intro p {
    font-size: var(--text-sub);
  }

  .page-about .about-origin__facts {
    padding: 28px;
  }

  .page-about .about-timeline__rail {
    margin-left: calc(50% - 410px);
    margin-right: calc(50% - 410px);
  }

  .page-about .about-system__card {
    padding: 34px;
  }

  .page-about .about-mission {
    padding-top: 120px;
    padding-bottom: 120px;
  }

  .page-about .about-cert {
    padding-top: 120px;
    padding-bottom: 120px;
  }

  .page-about .about-explore {
    padding-top: 120px;
    padding-bottom: 120px;
  }
}