.page-about {
  --ab-line: rgba(99, 230, 222, 0.16);
  --ab-soft: rgba(183, 198, 217, 0.95);
  color: var(--paper);
  background:
    radial-gradient(70rem 34rem at 92% -6%, rgba(99, 230, 222, 0.12), transparent 62%),
    radial-gradient(52rem 28rem at 0% 4%, rgba(255, 90, 42, 0.14), transparent 64%),
    var(--bg);
  overflow-x: clip;
}

.page-about .ab-crumb-wrap {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .ab-crumb-wrap .breadcrumb li,
.page-about .ab-crumb-wrap .breadcrumb a {
  color: var(--mist);
}

/* ---------- hero ---------- */
.page-about .ab-hero {
  position: relative;
  padding-bottom: clamp(28px, 5vw, 64px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, var(--lava), var(--gold) 42%, transparent 88%);
  opacity: 0.75;
}

.page-about .ab-hero-grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(20px, 4vw, 40px);
}

.page-about .ab-hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-hero-lead {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--ab-soft);
  max-width: 54ch;
}

.page-about .ab-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-hero-stats li {
  padding: 12px 14px;
  background: var(--slate);
  border: var(--edge);
  box-shadow: var(--hard-sm);
}

.page-about .ab-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--ice);
}

.page-about .ab-hero-stats li:nth-child(2) .ab-stat-num {
  color: var(--gold);
}

.page-about .ab-hero-stats li:nth-child(4) .ab-stat-num {
  color: var(--lava);
}

.page-about .ab-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero-visual {
  display: grid;
  gap: 12px;
}

.page-about .ab-stamp-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  margin: 0;
  padding-left: 2px;
}

.page-about .ab-stamp-note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- .page-about layout ---------- */
.page-about .ab-body {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(28px, 5vw, 60px) 0 clamp(48px, 8vw, 96px);
}

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

/* ---------- side index ---------- */
.page-about .ab-index {
  border: var(--edge);
  background: var(--bg-2);
  box-shadow: var(--hard-sm);
  padding: 12px 14px;
}

.page-about .ab-index-head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .ab-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-index-list li {
  flex: 0 0 auto;
}

.page-about .ab-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  font-size: 13px;
  color: var(--paper);
  text-decoration: none;
  background: var(--slate);
  border: 2px solid var(--ink);
  white-space: nowrap;
}

.page-about .ab-index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ice);
}

.page-about .ab-index-list a:hover,
.page-about .ab-index-list a:focus-visible {
  border-color: var(--lava);
  color: var(--gold);
}

.page-about .ab-index-tip {
  display: none;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 2px solid var(--ink);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .ab-index-tip p {
  margin: 0 0 6px;
}

.page-about .ab-index-tip .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  color: var(--lava);
}

.page-about .ab-index-tip a {
  color: var(--ice);
  font-size: 12.5px;
}

/* ---------- sections ---------- */
.page-about .ab-sec {
  padding: clamp(26px, 4.4vw, 46px) 0 0;
  border-top: 2px solid var(--ink);
}

.page-about .ab-sec + .ab-sec {
  margin-top: clamp(26px, 4.4vw, 46px);
}

.page-about .ab-sec .section-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3.8vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-sec p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ab-soft);
}

.page-about .ab-sec p a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-sec h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
  margin: 0;
}

.page-about .ab-quote {
  margin: 22px 0 0;
  padding: 16px 18px;
  background: var(--bg-2);
  border: var(--edge);
  border-left: 6px solid var(--gold);
  box-shadow: var(--hard-sm);
}

.page-about .ab-quote p {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.6;
  color: var(--gold);
}

.page-about .ab-quote cite {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .ab-after {
  margin-top: 20px !important;
  padding: 14px 16px;
  background: rgba(255, 90, 42, 0.1);
  border-left: 4px solid var(--lava);
  font-size: 14.5px !important;
  color: var(--paper) !important;
}

/* ---------- method ---------- */
.page-about .ab-method {
  display: grid;
  gap: 22px;
  margin-top: 20px;
}

.page-about .ab-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .ab-steps li {
  position: relative;
  padding: 14px 16px 16px 54px;
  background: var(--bg-2);
  border: var(--edge);
  box-shadow: var(--hard-sm);
}

.page-about .ab-steps li::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 46px;
  bottom: -14px;
  width: 2px;
  background: linear-gradient(180deg, var(--ice-deep), transparent);
}

.page-about .ab-steps li:last-child::before {
  display: none;
}

.page-about .ab-step-num {
  position: absolute;
  left: 12px;
  top: 14px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--lava);
}

.page-about .ab-steps p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .ab-method-visual {
  display: grid;
  gap: 14px;
  align-content: start;
}

/* ---------- code grid ---------- */
.page-about .ab-codes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-codes li {
  padding: 12px 13px 14px;
  background: var(--slate);
  border: 2px solid var(--ink);
  box-shadow: var(--hard-sm);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .ab-codes li:hover {
  transform: translate(-2px, -2px);
  border-color: var(--lava);
}

.page-about .ab-code-letter {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  color: var(--lava);
}

.page-about .ab-codes li:nth-child(4) .ab-code-letter,
.page-about .ab-codes li:nth-child(8) .ab-code-letter {
  color: var(--gold);
}

.page-about .ab-codes h3 {
  margin-top: 8px;
  font-size: 15px;
}

.page-about .ab-codes p {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .ab-code-meta {
  margin-top: 16px;
  padding: 12px 14px;
  border: 2px dashed var(--ice-deep);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-code-meta strong {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--ice);
  margin-right: 2px;
}

/* ---------- team ---------- */
.page-about .ab-team-visual {
  margin-top: 20px;
}

.page-about .ab-tabs {
  margin-top: 18px;
}

.page-about .ab-tabs .tab-panel h3 {
  color: var(--gold);
  font-size: 16px;
}

.page-about .ab-tabs .tab-panel p {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- timeline ---------- */
.page-about .ab-tl {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-about .ab-tl-item {
  background: var(--bg-2);
  border: var(--edge);
  box-shadow: var(--hard-sm);
}

.page-about .ab-tl-item[open] {
  border-left: 6px solid var(--lava);
}

.page-about .ab-tl-item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 13px 14px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-tl-item summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-tl-item summary:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
}

.page-about .ab-tl-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--gold);
  padding-right: 12px;
  border-right: 2px solid var(--ink);
}

.page-about .ab-tl-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15.5px;
  color: var(--paper);
}

.page-about .ab-tl-flag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ice);
  padding: 3px 8px;
  border: 1px solid var(--ice-deep);
  background: rgba(30, 127, 123, 0.22);
}

.page-about .ab-tl-body {
  padding: 0 14px 14px;
  border-top: 2px solid var(--ink);
}

.page-about .ab-tl-body p {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.78;
}

/* ---------- partners ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .ab-partner h3 {
  font-size: 16px;
  color: var(--gold);
}

.page-about .ab-partner p:not(.card-meta) {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- contact ---------- */
.page-about .ab-contact-panel {
  display: grid;
  gap: 14px;
  margin-top: 20px;
  padding: 18px;
  background: var(--bg-2);
  border: var(--edge);
  box-shadow: var(--hard);
}

.page-about .ab-contact-col p {
  margin: 0;
}

.page-about .ab-contact-col .footer-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ice);
  margin-top: 10px;
}

.page-about .ab-contact-col .footer-label:first-child {
  margin-top: 0;
}

.page-about .ab-contact-col .footer-value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  font-weight: 700;
  word-break: break-word;
}

.page-about .ab-contact-note {
  padding-top: 14px;
  border-top: 2px solid var(--ink);
}

.page-about .ab-contact-note p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-contact-note .btn {
  margin-top: 14px;
}

.page-about .ab-icp {
  margin-top: 16px !important;
  font-family: var(--font-mono);
  font-size: 12px !important;
  color: var(--mist) !important;
  letter-spacing: 0.03em;
}

/* ---------- reveal ---------- */
.page-about [data-reveal] {
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.page-about [data-reveal]:not(.is-revealed) {
  opacity: 0;
  transform: translateY(14px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .ab-codes li {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ---------- tablet / desktop ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-codes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-method {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 26px;
  }

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

  .page-about .ab-contact-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 24px;
  }

  .page-about .ab-contact-note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 980px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }

  .page-about .ab-body {
    grid-template-columns: minmax(0, 1fr) 232px;
    align-items: start;
    gap: 52px;
  }

  .page-about .ab-index {
    position: sticky;
    top: 96px;
    padding: 16px;
  }

  .page-about .ab-index-list {
    display: grid;
    gap: 6px;
    overflow: visible;
  }

  .page-about .ab-index-list a {
    width: 100%;
    justify-content: flex-start;
    white-space: normal;
    background: transparent;
    border: 2px solid transparent;
    border-left: 2px solid var(--ink);
    padding: 8px 8px 8px 10px;
  }

  .page-about .ab-index-list a:hover,
  .page-about .ab-index-list a:focus-visible {
    background: var(--slate);
    border-color: var(--ink);
    border-left-color: var(--lava);
  }

  .page-about .ab-index-tip {
    display: block;
  }

  .page-about .ab-tl-item summary {
    padding: 15px 18px;
  }

  .page-about .ab-tl-body {
    padding: 0 18px 18px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero-copy h1 {
    max-width: 15ch;
  }
}