.page-about {
  --about-rail: 190px;
  position: relative;
  isolation: isolate;
  background: var(--bg);
  color: var(--bone);
  padding-bottom: clamp(48px, 8vw, 104px);
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(47, 74, 64, 0.22) 0 1px, transparent 1px 112px),
    repeating-linear-gradient(0deg, rgba(47, 74, 64, 0.13) 0 1px, transparent 1px 112px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0.12) 72%, transparent);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0.12) 72%, transparent);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.6vw, 38px) 0 clamp(34px, 6vw, 74px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -1px;
  width: 46%;
  height: clamp(60px, 12vw, 140px);
  background: var(--panel);
  opacity: 0.55;
  clip-path: polygon(22% 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-about .breadcrumb-current {
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 54px);
  align-items: end;
  margin-top: clamp(22px, 4vw, 44px);
}

.page-about h1 {
  margin: 0.28em 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 7.4vw, 5.2rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--bone);
  text-wrap: balance;
}

.page-about .lede {
  max-width: 54ch;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .figure-item {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: clamp(14px, 2vw, 20px);
  background: var(--bg-deep);
}

.page-about .figure-num {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3vw, 2.05rem);
  font-weight: 600;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-about .figure-label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- Body grid ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 60px);
  padding-top: clamp(34px, 6vw, 70px);
}

.page-about .about-rail {
  position: relative;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-list > li {
  flex: 0 0 auto;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 11px;
  font-size: 13.5px;
  line-height: 1.2;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  background: transparent;
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--accent);
  background: var(--panel);
  border-color: var(--line);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}

/* ---------- Chapter shell ---------- */
.page-about .chapter + .chapter {
  position: relative;
  margin-top: clamp(38px, 6vw, 82px);
  padding-top: clamp(32px, 5vw, 58px);
  border-top: 1px solid var(--line);
}

.page-about .chapter + .chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 58px;
  height: 1px;
  background: var(--accent);
}

.page-about .chapter-head {
  margin-bottom: clamp(16px, 2.8vw, 28px);
}

.page-about .chapter-tag {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 5px 12px 5px 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  font-family: var(--font-serif);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 11px 100%, 0 calc(100% - 11px));
}

.page-about .chapter-tag-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-about .chapter h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4vw, 2.85rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--bone);
  text-wrap: balance;
}

.page-about .chapter-lede {
  max-width: 62ch;
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .chapter-foot {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-serif);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--dim);
}

/* ---------- 01 origin ---------- */
.page-about .chapter-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

.page-about .chapter-text p {
  margin: 0 0 1em;
  font-size: 15.5px;
  line-height: 1.92;
  color: var(--mist);
}

.page-about .chapter-text p:last-of-type {
  margin-bottom: 0;
}

.page-about .pull {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--accent);
  font-family: var(--font-serif);
  font-size: clamp(15px, 2vw, 17.5px);
  line-height: 1.85;
  color: var(--bone);
}

.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-figure figcaption {
  padding: 10px 14px 13px;
  font-family: var(--font-serif);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--dim);
}

.page-about .about-figure--wide {
  margin-top: clamp(22px, 3.4vw, 34px);
}

/* ---------- 02 audience ---------- */
.page-about .audience-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .audience-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  align-content: start;
  padding: clamp(17px, 2.6vw, 26px);
  background: var(--bg-deep);
  transition: background var(--dur) var(--ease);
}

.page-about .audience-item:hover {
  background: var(--panel);
}

.page-about .audience-key {
  grid-row: span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-about .audience-item h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.3;
  color: var(--bone);
}

.page-about .audience-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 03 process ---------- */
.page-about .flow-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 2.2vw, 18px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-item {
  position: relative;
  padding: clamp(17px, 2.4vw, 24px);
  background: var(--panel);
  border-top: 2px solid var(--accent);
}

.page-about .flow-step {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-about .flow-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.14rem;
  color: var(--bone);
}

.page-about .flow-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 04 synergy ---------- */
.page-about .track-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(10px, 1.8vw, 16px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .track-item {
  padding: 16px 15px 18px;
  background: var(--bg-deep);
  border-left: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .track-item:hover {
  border-left-color: var(--accent);
  background: var(--panel);
}

.page-about .track-code {
  display: inline-block;
  margin-bottom: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.page-about .track-item h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--bone);
}

.page-about .track-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .dayline {
  margin-top: clamp(20px, 3.2vw, 30px);
  padding: clamp(18px, 2.6vw, 26px);
  background: linear-gradient(120deg, rgba(100, 245, 178, 0.09), rgba(100, 245, 178, 0) 62%), var(--bg-deep);
  border-left: 2px solid var(--accent);
}

.page-about .dayline-title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-about .dayline p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .inline-link {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(100, 245, 178, 0.45);
  padding-bottom: 2px;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  border-bottom-color: var(--accent);
}

/* ---------- 05 team ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: clamp(22px, 3.4vw, 32px);
  background: var(--line);
}

.page-about .team-stat {
  padding: clamp(15px, 2.4vw, 24px);
  background: var(--bg-deep);
}

.page-about .team-stat strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 600;
  line-height: 1.05;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-about .team-stat span {
  display: block;
  margin-top: 9px;
  font-size: 12.8px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .team-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.4vw, 36px);
  align-items: start;
}

.page-about .team-roles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
}

.page-about .team-roles li {
  padding: 14px 16px;
  background: var(--panel);
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .team-roles strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--bone);
}

/* ---------- 06 milestone ---------- */
.page-about .milestones {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .milestone {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: clamp(12px, 2.2vw, 24px);
  padding-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .milestone:last-child {
  padding-bottom: 0;
}

.page-about .milestone-year {
  padding-top: 1px;
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-about .milestone-body {
  position: relative;
  padding: 0 0 2px clamp(13px, 2.2vw, 22px);
  border-left: 1px solid var(--line);
}

.page-about .milestone-body::before {
  content: "";
  position: absolute;
  left: -3.5px;
  top: 7px;
  width: 6px;
  height: 6px;
  background: var(--bg);
  border: 1px solid var(--accent);
  border-radius: 50%;
}

.page-about .milestone-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 1.9vw, 1.18rem);
  line-height: 1.35;
  color: var(--bone);
}

.page-about .milestone-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 07 support ---------- */
.page-about .support-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .support-col {
  padding: clamp(17px, 2.6vw, 26px);
  background: var(--bg-deep);
}

.page-about .support-label {
  display: block;
  margin-bottom: 9px;
  font-family: var(--font-serif);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--dim);
}

.page-about .support-value {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 2.1vw, 1.12rem);
  line-height: 1.55;
  color: var(--accent);
  word-break: break-word;
}

.page-about .support-note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 32px);
}

/* ---------- Responsive ---------- */
@media (min-width: 600px) {
  .page-about .support-panel {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .audience-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .team-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }

  .page-about .chapter-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.04fr);
  }

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

  .page-about .flow-item::after {
    content: "";
    position: absolute;
    top: -2px;
    left: -18px;
    width: 18px;
    height: 2px;
    background: var(--line);
  }

  .page-about .flow-item:first-child::after {
    display: none;
  }

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

@media (min-width: 900px) {
  .page-about .track-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-link {
    display: flex;
    width: 100%;
    padding: 9px 10px;
    border-color: transparent;
    border-left: 2px solid transparent;
    white-space: normal;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-color: transparent;
    border-left-color: var(--accent);
    background: var(--panel);
  }
}
<<<END>>>