.page-about {
  --about-pad: clamp(64px, 8vw, 112px);
  --about-radius: 30px;
  position: relative;
  background: var(--ink);
  color: var(--bone);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4vw, 56px) 0 clamp(56px, 7vw, 100px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(760px 380px at 82% 6%, rgba(63, 224, 206, 0.16), transparent 68%),
    radial-gradient(560px 300px at 4% 46%, rgba(255, 107, 53, 0.1), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  align-items: start;
  margin-top: clamp(30px, 4vw, 58px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--bone);
  overflow-wrap: break-word;
}

.page-about .about-hero__title-em {
  display: block;
  color: var(--neon);
}

.page-about .about-lead {
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.88;
  color: rgba(207, 243, 237, 0.84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .about-hero__actions .btn {
  text-decoration: none;
}

/* ---------- Facts rail ---------- */
.page-about .about-facts {
  display: grid;
  gap: 12px;
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(155deg, rgba(15, 59, 56, 0.92), rgba(10, 35, 32, 0.62));
}

.page-about .about-fact__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(26px, 2.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .about-fact__unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--neon);
}

.page-about .about-fact__text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- Chapter frame ---------- */
.page-about .about-chapter {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-chapter--teal {
  background: linear-gradient(180deg, rgba(15, 59, 56, 0.55), rgba(10, 35, 32, 0.2));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter--deep {
  background: var(--ink);
}

.page-about .about-chapter--bone {
  background: var(--bone);
  color: var(--paper);
}

.page-about .about-chapter--indigo {
  background: linear-gradient(180deg, rgba(43, 42, 90, 0.72), rgba(10, 35, 32, 0.5));
  border-top: 1px solid rgba(207, 243, 237, 0.12);
  border-bottom: 1px solid rgba(207, 243, 237, 0.12);
}

.page-about .about-board {
  padding: clamp(24px, 3.6vw, 52px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(165deg, rgba(15, 59, 56, 0.72), rgba(10, 35, 32, 0.46));
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.34);
}

.page-about .chapter-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(24px, 3vw, 40px);
  flex-wrap: wrap;
}

.page-about .chapter-num {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .chapter-rule {
  display: block;
  width: 52px;
  height: 2px;
  border-radius: 2px;
  background: var(--neon);
}

.page-about .chapter-title {
  margin: 0 0 clamp(16px, 2vw, 24px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .chapter-title--dark {
  color: var(--paper);
}

.page-about .about-copy p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.88;
  color: rgba(207, 243, 237, 0.82);
}

.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-copy--dark p {
  color: rgba(20, 32, 30, 0.8);
}

/* ---------- Note block ---------- */
.page-about .about-note {
  padding: 22px 22px 18px;
  border: 1px solid rgba(63, 224, 206, 0.28);
  border-radius: var(--r-lg);
  background: rgba(10, 35, 32, 0.55);
}

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

.page-about .about-note__list li {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(207, 243, 237, 0.76);
  padding-left: 14px;
  border-left: 2px solid rgba(255, 107, 53, 0.5);
}

.page-about .about-note__k {
  display: inline-block;
  min-width: 3.2em;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

/* ---------- Team ---------- */
.page-about .about-team__grid {
  align-items: start;
}

.page-about .about-team__figure {
  margin-top: clamp(20px, 3vw, 44px);
}

.page-about .about-team__media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: var(--r-lg);
}

.page-about .about-team__media {
  border-radius: var(--about-radius);
  background: linear-gradient(150deg, rgba(43, 42, 90, 0.5), rgba(20, 32, 30, 0.9));
}

.page-about .team-lines {
  display: grid;
  gap: 12px;
  margin-top: clamp(36px, 4.6vw, 64px);
}

.page-about .team-line {
  border: 1px solid rgba(20, 32, 30, 0.14);
  border-radius: var(--r-lg);
  background: #ffffff;
  overflow: hidden;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .team-line:hover {
  border-color: var(--neon);
  box-shadow: 0 14px 32px rgba(10, 35, 32, 0.14);
}

.page-about .team-line__trigger {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num hint";
  align-items: center;
  gap: 2px 16px;
  width: 100%;
  padding: 18px 20px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-body);
  color: var(--paper);
}

.page-about .team-line__num {
  grid-area: num;
  font-size: 22px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .team-line__name {
  grid-area: name;
  font-size: 17px;
  font-weight: 700;
}

.page-about .team-line__hint {
  grid-area: hint;
  font-size: 13px;
  color: rgba(20, 32, 30, 0.55);
}

.page-about .team-line__panel {
  padding: 0 20px 18px 58px;
}

.page-about .team-line__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(20, 32, 30, 0.78);
  border-left: 2px solid var(--neon);
  padding-left: 14px;
}

/* ---------- Flow ---------- */
.page-about .about-flow__figure {
  margin-top: clamp(20px, 3vw, 40px);
}

.page-about .about-flow__media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: var(--r-lg);
}

.page-about .flow-list {
  position: relative;
  margin: clamp(34px, 4.4vw, 60px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--neon), rgba(63, 224, 206, 0.08));
}

.page-about .flow-item {
  position: relative;
  padding: 0 0 18px 34px;
}

.page-about .flow-node {
  position: absolute;
  left: 0;
  top: 12px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.18);
}

.page-about .flow-trigger {
  display: flex;
  align-items: baseline;
  gap: 14px;
  width: 100%;
  padding: 8px 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  color: var(--bone);
  font-family: var(--font-body);
}

.page-about .flow-step {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .flow-title {
  font-size: clamp(16px, 1.6vw, 20px);
  font-weight: 700;
}

.page-about .flow-trigger:hover .flow-title,
.page-about .flow-trigger:focus-visible .flow-title {
  color: var(--neon);
}

.page-about .flow-panel {
  padding: 2px 0 10px 0;
}

.page-about .flow-panel p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.82;
  color: rgba(207, 243, 237, 0.78);
}

.page-about .flow-output {
  font-size: 13px;
  color: rgba(207, 243, 237, 0.6);
}

.page-about .flow-output .label-en {
  margin-right: 8px;
  color: var(--orange);
}

.page-about .about-flow__foot {
  display: grid;
  gap: 20px;
  margin-top: clamp(28px, 3.6vw, 48px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--line);
}

.page-about .about-flow__footmedia img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: var(--r-lg);
}

.page-about .about-flow__footnote {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(207, 243, 237, 0.68);
}

/* ---------- Coverage ---------- */
.page-about .about-cover__grid {
  align-items: start;
}

.page-about .about-cover__legend {
  margin-top: clamp(22px, 3vw, 40px);
}

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

.page-about .region-legend__item {
  display: grid;
  grid-template-columns: 14px 1fr;
  grid-template-areas:
    "dot name"
    "dot note";
  gap: 2px 12px;
  align-items: start;
}

.page-about .region-dot {
  grid-area: dot;
  width: 10px;
  height: 10px;
  margin-top: 6px;
  border-radius: 50%;
}

.page-about .region-dot--south {
  background: var(--neon);
}

.page-about .region-dot--east {
  background: var(--orange);
}

.page-about .region-dot--west {
  background: var(--pale);
}

.page-about .region-legend__name {
  grid-area: name;
  font-size: 15px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .region-legend__note {
  grid-area: note;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin-top: clamp(34px, 4.4vw, 58px);
}

.page-about .coverage-cell {
  aspect-ratio: 1 / 1;
  border-radius: 12px;
  border: 1px solid rgba(207, 243, 237, 0.16);
  background: linear-gradient(150deg, rgba(63, 224, 206, 0.16), rgba(43, 42, 90, 0.4));
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .coverage-cell:hover {
  transform: translateY(-4px) scale(1.05);
  border-color: var(--neon);
  background: linear-gradient(150deg, rgba(63, 224, 206, 0.55), rgba(255, 107, 53, 0.35));
}

.page-about .coverage-caption {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- Partners ---------- */
.page-about .about-partners__grid {
  align-items: start;
}

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 2px;
}

.page-about .about-inline-link:hover {
  color: var(--wine);
  border-color: var(--wine);
}

.page-about .about-honors {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 40px);
}

.page-about .honor-card {
  padding: 22px 22px 20px;
  border-radius: var(--r-lg);
  border: 1px solid rgba(20, 32, 30, 0.14);
  background: #ffffff;
}

.page-about .honor-card--accent {
  border-color: rgba(255, 107, 53, 0.4);
  background: linear-gradient(155deg, rgba(255, 107, 53, 0.1), #ffffff 62%);
}

.page-about .honor-card__year {
  margin: 0 0 10px;
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .honor-card__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper);
}

.page-about .honor-card__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(20, 32, 30, 0.55);
}

/* ---------- Readers ---------- */
.page-about .about-readers__lead {
  max-width: 46em;
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-about .reader-gains {
  display: grid;
  gap: 14px;
}

.page-about .gain-card {
  padding: 22px 22px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(15, 59, 56, 0.86), rgba(10, 35, 32, 0.5));
  transition: transform 0.34s var(--ease), border-color 0.34s var(--ease);
}

.page-about .gain-card:hover {
  transform: translateY(-5px);
  border-color: var(--neon);
}

.page-about .gain-card__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .gain-card__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .gain-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(207, 243, 237, 0.76);
}

.page-about .reader-extras {
  margin-top: clamp(26px, 3.2vw, 40px);
  padding-top: clamp(22px, 2.8vw, 32px);
  border-top: 1px solid var(--line);
}

.page-about .reader-extras p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.86;
  color: rgba(207, 243, 237, 0.76);
}

.page-about .reader-extras p:last-child {
  margin-bottom: 0;
}

.page-about .reader-extras a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 206, 0.5);
}

.page-about .reader-extras a:hover {
  border-bottom-color: var(--neon);
}

/* ---------- Tail ---------- */
.page-about .about-tail {
  position: relative;
  padding: clamp(56px, 7vw, 96px) 0 clamp(72px, 8vw, 120px);
  background: var(--ink);
}

.page-about .about-tail__inner {
  padding: clamp(28px, 4vw, 52px);
  border-radius: var(--about-radius);
  border: 1px solid rgba(255, 107, 53, 0.32);
  background:
    radial-gradient(520px 260px at 88% 10%, rgba(255, 107, 53, 0.18), transparent 70%),
    linear-gradient(160deg, rgba(15, 59, 56, 0.9), rgba(10, 35, 32, 0.6));
}

.page-about .about-tail__title {
  margin: 14px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 36px);
  line-height: 1.28;
  color: var(--bone);
}

.page-about .about-tail__text {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 42em;
  font-size: clamp(14px, 1.1vw, 16px);
  line-height: 1.85;
  color: rgba(207, 243, 237, 0.78);
}

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

.page-about .about-tail__actions .btn {
  text-decoration: none;
}

/* ---------- Responsive ---------- */
@media (min-width: 720px) {
  .page-about .coverage-grid {
    grid-template-columns: repeat(7, 1fr);
    gap: 12px;
  }

  .page-about .about-flow__foot {
    grid-template-columns: 5fr 4fr;
    align-items: end;
    gap: 32px;
  }

  .page-about .reader-gains {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__title {
    margin-left: -0.04em;
  }

  .page-about .about-team__figure {
    margin-top: 56px;
  }

  .page-about .about-flow__figure {
    margin-top: 46px;
  }

  .page-about .about-cover__legend {
    margin-top: 72px;
  }

  .page-about .about-honors {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .coverage-cell,
  .page-about .gain-card,
  .page-about .team-line {
    transition: none;
  }

  .page-about .coverage-cell:hover,
  .page-about .gain-card:hover {
    transform: none;
  }
}