.page-about {
  --about-axis-w: 64px;
  background: var(--mist);
  color: var(--graphite);
}

@media (min-width: 768px) {
  .page-about {
    --about-axis-w: 118px;
  }
}

/* ---------- Hero ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(72px, 13vh, 132px) 0 clamp(48px, 8vh, 92px);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(56, 189, 248, 0.18), transparent 62%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-2) 62%, #0d3157 100%);
  color: var(--white);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: 62%;
  aspect-ratio: 1;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb a,
.page-about .about-hero .breadcrumb li {
  color: rgba(255, 255, 255, 0.68);
}

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

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  margin-top: clamp(24px, 4vw, 48px);
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

.page-about .about-hero__copy .eyebrow {
  color: var(--mint);
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, var(--fs-72));
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero .lead {
  max-width: 46ch;
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .about-hero__actions .btn--ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.34);
}

.page-about .about-hero__actions .btn--ghost:hover {
  border-color: var(--mint);
  color: var(--mint);
}

.page-about .about-hero__visual {
  display: flex;
  justify-content: center;
}

.page-about .about-orbit {
  width: 100%;
  max-width: 420px;
  height: auto;
  overflow: visible;
}

/* ---------- Timeline chapters ---------- */

.page-about .about-chapter {
  padding-block: clamp(56px, 9vw, 104px);
}

.page-about .about-timeline {
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 7vw, 88px);
}

.page-about .about-node {
  display: grid;
  grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
  gap: clamp(14px, 3vw, 34px);
  position: relative;
}

.page-about .about-node__axis {
  position: relative;
  padding-top: 8px;
}

.page-about .about-node__axis::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 30px;
  bottom: -70px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), rgba(11, 42, 74, 0.02));
}

.page-about .about-node:last-child .about-node__axis::before {
  display: none;
}

.page-about .about-node__pip {
  display: block;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--line-strong);
  transition: background 0.45s ease, border-color 0.45s ease, box-shadow 0.45s ease;
}

.page-about .about-node.is-visible .about-node__pip {
  background: var(--mint);
  border-color: var(--mint);
  box-shadow: 0 0 0 7px rgba(46, 196, 182, 0.14);
}

.page-about .about-node__label {
  display: block;
  margin-top: 12px;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mint-ink);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

@media (min-width: 768px) {
  .page-about .about-node__label {
    writing-mode: horizontal-tb;
    font-size: var(--fs-14);
  }
}

.page-about .about-node__body h2 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, var(--fs-36));
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-node__body .prose {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.9;
  color: var(--graphite);
}

.page-about .about-node__body .prose a {
  color: var(--mint-ink);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-about .about-node__body .prose a:hover {
  color: var(--orange-deep);
}

/* ---------- Media ---------- */

.page-about .media {
  margin: clamp(24px, 4vw, 40px) 0 0;
  background: linear-gradient(135deg, rgba(11, 42, 74, 0.05) 0 12px, transparent 12px 24px);
}

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-map .media__img {
  aspect-ratio: 2 / 1;
}

.page-about .about-node__body .media--tall .media__img {
  aspect-ratio: 4 / 3;
}

.page-about .media__caption {
  margin-top: 10px;
  font-family: var(--font-ui);
  font-size: var(--fs-14);
  color: var(--grey);
}

/* ---------- Network band ---------- */

.page-about .about-network {
  position: relative;
  padding-block: clamp(56px, 9vw, 104px);
  background: linear-gradient(120deg, var(--ink) 0%, var(--ink-2) 58%, #123a63 100%);
  color: rgba(255, 255, 255, 0.86);
}

.page-about .about-network::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: clamp(6px, 1vw, 12px);
  background: linear-gradient(180deg, var(--mint), var(--electric) 55%, var(--orange));
}

.page-about .about-network__head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-network__head .coord {
  color: var(--mint);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-network__head h2 {
  margin: 14px 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.8vw, var(--fs-36));
  line-height: 1.28;
  color: var(--white);
}

.page-about .about-network__head .lead {
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-network .filter-bar {
  flex-wrap: wrap;
}

.page-about .about-network .filter-chip {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.24);
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-network .filter-chip[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--white);
}

.page-about .about-region-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 32px);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 700px) {
  .page-about .about-region-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-region-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-region {
  padding: 20px 22px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.04);
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
}

.page-about .about-region:hover {
  border-color: rgba(46, 196, 182, 0.6);
  background: rgba(46, 196, 182, 0.08);
  transform: translateY(-3px);
}

.page-about .about-region__name {
  margin: 0 0 8px;
  font-size: var(--fs-14);
  letter-spacing: 0.16em;
  color: var(--electric);
}

.page-about .about-region__meta {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-map {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .about-map .media__caption {
  color: rgba(255, 255, 255, 0.62);
}

/* ---------- Closing ---------- */

.page-about .about-close {
  padding-block: clamp(56px, 10vw, 120px);
  background: var(--mist);
  text-align: left;
}

.page-about .slant-band {
  width: 76px;
  height: 8px;
  margin-bottom: clamp(20px, 3vw, 32px);
  background: repeating-linear-gradient(
    115deg,
    var(--orange) 0 10px,
    transparent 10px 20px
  );
}

.page-about .about-quote {
  margin: 0;
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, var(--fs-52));
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-quote p::before {
  content: "「";
  color: var(--mint);
}

.page-about .about-quote p::after {
  content: "」";
  color: var(--mint);
}

.page-about .about-close__note {
  margin-top: clamp(22px, 3vw, 34px);
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.9;
  color: var(--grey);
}

.page-about .about-close__note a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-close__note a:hover {
  color: var(--orange-deep);
}