.page-about {
  --about-cut: 20px;
  position: relative;
  overflow-x: clip;
  background: var(--bg-deep);
  color: var(--white);
}

.page-about .about-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 56px) 0 88px;
  background:
    linear-gradient(115deg, rgba(230, 0, 18, 0.10) 0%, transparent 45%),
    radial-gradient(1000px 520px at 85% 15%, rgba(212, 175, 55, 0.08), transparent 65%),
    var(--bg-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 56px), 0 100%);
}

.page-about .about-field-pattern {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.5;
}

.page-about .about-hero-bg-num {
  position: absolute;
  top: 16vh;
  right: -24px;
  font-family: var(--font-heavy);
  font-size: clamp(150px, 24vw, 420px);
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px rgba(212, 175, 55, 0.16);
  user-select: none;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-crumbs {
  margin-bottom: 36px;
}

.page-about .about-hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 18px;
}

.page-about .about-hero-rule {
  display: inline-block;
  width: 42px;
  height: 2px;
  background: linear-gradient(90deg, var(--red), var(--gold));
  flex: 0 0 auto;
}

.page-about .about-hero-title {
  font-family: var(--font-heavy);
  font-size: clamp(34px, 5.6vw, 78px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--white);
  margin: 0 0 26px;
  max-width: 980px;
}

.page-about .about-hero-title-red {
  color: var(--red);
  display: inline-block;
  margin-right: 0.12em;
  background: linear-gradient(180deg, rgba(230, 0, 18, 0.1) 0%, transparent 100%);
  padding: 0 0.08em;
}

.page-about .about-hero-sub {
  font-size: 17px;
  line-height: 1.7;
  color: var(--gray);
  max-width: 560px;
  margin: 0 0 36px;
}

.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.page-about .about-stat {
  background: rgba(27, 31, 42, 0.75);
  border-left: 3px solid var(--red);
  padding: 16px 20px;
  min-width: 130px;
  backdrop-filter: blur(6px);
}

.page-about .about-stat-num {
  display: block;
  font-size: 34px;
  font-family: var(--font-mono);
  color: var(--green);
  line-height: 1.1;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-hero-scroll {
  max-width: 260px;
}

.page-about .section-title {
  font-family: var(--font-heavy);
  font-weight: 900;
  line-height: 1.15;
  margin: 14px 0 0;
  letter-spacing: -0.02em;
}

.page-about .section-title--line {
  padding-left: 0;
  position: relative;
}

.page-about .section-title--line::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 0.9em;
  background: var(--red);
  margin-right: 12px;
  vertical-align: -0.08em;
  border-radius: 2px;
}

.page-about .about-section-head {
  margin-bottom: 44px;
  max-width: 860px;
}

.page-about .about-head-row {
  display: flex;
  align-items: flex-start;
  gap: 18px;
}

.page-about .about-chapter-num {
  flex: 0 0 auto;
  font-size: 18px;
  line-height: 1.6;
  color: var(--gold);
  margin-top: 4px;
}

.page-about .about-kicker {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--gray);
  text-transform: uppercase;
  margin: 0;
}

.page-about .about-origin {
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .about-origin-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .about-origin-text p {
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.88);
  margin: 0 0 18px;
}

.page-about .about-origin-quote {
  margin: 30px 0 0;
  padding: 24px 26px;
  background: var(--bg-card);
  border-left: 4px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .about-origin-quote p {
  font-family: var(--font-heavy);
  font-size: 18px;
  line-height: 1.5;
  color: var(--white);
  margin-bottom: 8px;
}

.page-about .about-origin-quote cite {
  font-style: normal;
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-origin-figure {
  margin: 0;
}

.page-about .about-origin-img,
.page-about .about-milestone-figure img,
.page-about .about-flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .image-caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-milestones {
  background:
    radial-gradient(900px 420px at 85% 0%, rgba(230, 0, 18, 0.14), transparent 60%),
    linear-gradient(180deg, var(--bg-card) 0%, var(--bg-deep) 100%);
  border-top: 1px solid rgba(230, 0, 18, 0.2);
  border-bottom: 1px solid rgba(230, 0, 18, 0.2);
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .about-version-filter {
  margin-bottom: 40px;
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-timeline {
  position: relative;
  margin: 0 0 56px;
  padding-left: 46px;
}

.page-about .about-timeline-line {
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 15px;
  width: 0;
  border-left: 2px dashed rgba(230, 0, 18, 0.55);
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.page-about .about-timeline-node {
  position: absolute;
  top: 14px;
  left: -46px;
  width: 34px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.page-about .about-timeline-node-link {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: transform var(--t-base), box-shadow var(--t-base);
}

.page-about .about-timeline-node-link:hover,
.page-about .about-timeline-node-link:focus-visible {
  transform: scale(1.2);
  box-shadow: 0 0 0 8px rgba(212, 175, 55, 0.12);
  outline: none;
}

.page-about .about-timeline-node svg {
  display: block;
}

.page-about .about-timeline-node--v3 .about-timeline-node-link:hover,
.page-about .about-timeline-node--v3 .about-timeline-node-link:focus-visible {
  box-shadow: 0 0 0 8px rgba(57, 255, 20, 0.14);
}

.page-about .about-timeline-node-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gray);
}

.page-about .about-timeline-card {
  position: relative;
  background: var(--bg-card);
  padding: 26px 22px 22px;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: transform var(--t-base), box-shadow var(--t-base);
}

.page-about .about-timeline-card:hover,
.page-about .about-timeline-card:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.28);
}

.page-about .about-version-card--v2 {
  background:
    linear-gradient(135deg, rgba(212, 175, 55, 0.06) 0%, transparent 40%),
    var(--bg-card);
}

.page-about .about-version-card--v3 {
  background:
    linear-gradient(135deg, rgba(57, 255, 20, 0.1) 0%, transparent 45%),
    var(--bg-card);
  box-shadow: inset 0 0 0 1px rgba(57, 255, 20, 0.4);
  padding: 30px 26px 26px;
}

.page-about .about-version-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.page-about .about-version-code {
  font-size: 12px;
  color: var(--gray);
}

.page-about .about-timeline-card h3 {
  font-family: var(--font-heavy);
  font-size: 20px;
  font-weight: 900;
  margin: 0 0 12px;
  color: var(--white);
}

.page-about .about-version-card--v3 h3 {
  font-size: 24px;
}

.page-about .about-timeline-card p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 247, 250, 0.82);
  margin: 0 0 14px;
}

.page-about .about-version-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-version-list li {
  padding: 2px 0;
}

.page-about .about-version-list .data-mono {
  color: var(--gold);
  margin-right: 6px;
}

.page-about .about-version-hover-note {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--gray);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  transition: max-height 0.45s var(--ease-out), opacity 0.3s var(--ease-out), margin 0.3s var(--ease-out);
}

.page-about .about-timeline-card:hover .about-version-hover-note,
.page-about .about-timeline-card:focus-within .about-version-hover-note {
  max-height: 140px;
  opacity: 1;
  margin-top: 14px;
  padding-top: 10px;
}

.page-about .about-milestone-figure {
  margin: 0;
}

.page-about .about-milestone-figure img {
  max-height: 480px;
}

.page-about .about-process {
  background: var(--bg-blue);
  border-top: 1px solid rgba(57, 255, 20, 0.08);
  border-bottom: 1px solid rgba(57, 255, 20, 0.08);
}

.page-about .about-process .section-title::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 0.85em;
  background: var(--green);
  margin-right: 12px;
  vertical-align: -0.08em;
}

.page-about .about-process-flow {
  display: grid;
  gap: 12px;
  margin-bottom: 48px;
}

.page-about .about-process-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: rgba(11, 15, 25, 0.55);
  padding: 18px 20px;
  border-left: 2px solid rgba(57, 255, 20, 0.5);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about .about-process-index {
  flex: 0 0 auto;
  font-size: 16px;
  color: var(--green);
  line-height: 1.4;
}

.page-about .about-process-step h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--white);
}

.page-about .about-process-step p {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(245, 247, 250, 0.72);
  margin: 0;
}

.page-about .about-process-team {
  display: grid;
  gap: 20px;
  align-items: start;
  background: var(--bg-card);
  border-left: 4px solid var(--gold);
  padding: 26px 24px;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-process-team-num {
  font-size: 64px;
  line-height: 0.9;
  color: var(--green);
  font-family: var(--font-mono);
}

.page-about .about-process-team-copy h3 {
  font-size: 18px;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .about-process-team-copy p {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.78);
  margin: 0 0 12px;
}

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

.page-about .about-expansion {
  background:
    linear-gradient(165deg, rgba(138, 13, 22, 0.22) 0%, transparent 50%),
    var(--bg-deep);
  border-top: 1px solid rgba(212, 175, 55, 0.12);
}

.page-about .about-expansion .section-title {
  color: var(--white);
}

.page-about .about-expansion-grid {
  display: grid;
  gap: 20px;
}

.page-about .about-expansion-card {
  position: relative;
  background: var(--bg-card);
  padding: 28px 24px 24px;
  border-top: 3px solid var(--red);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: transform var(--t-base), box-shadow var(--t-base);
}

.page-about .about-expansion-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.3);
}

.page-about .about-expansion-index {
  position: absolute;
  top: 16px;
  right: 22px;
  font-size: 20px;
  color: rgba(212, 175, 55, 0.65);
}

.page-about .about-expansion-card .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-expansion-card h3 {
  font-family: var(--font-heavy);
  font-size: 19px;
  font-weight: 900;
  color: var(--white);
  margin: 0 0 10px;
  line-height: 1.35;
}

.page-about .about-expansion-card p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 247, 250, 0.76);
  margin: 0 0 20px;
}

.page-about .about-expansion-card .btn {
  font-size: 13px;
  padding: 9px 16px;
}

.page-about .about-quote-block {
  margin: 60px auto 0;
  max-width: 760px;
  text-align: center;
  position: relative;
  padding: 40px 28px;
  background: var(--bg-card);
  border-top: 3px solid var(--gold);
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-quote-block p {
  font-family: var(--font-heavy);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 900;
  line-height: 1.5;
  color: var(--white);
  margin: 0 0 16px;
}

.page-about .about-quote-block cite {
  font-style: normal;
  font-size: 13px;
  color: var(--gray);
  letter-spacing: 0.04em;
}

.page-about .about-flow-section {
  background:
    radial-gradient(800px 360px at 15% 0%, rgba(57, 255, 20, 0.06), transparent 60%),
    var(--bg-deep);
}

.page-about .about-flow-section .section-title::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 0.85em;
  background: var(--green);
  margin-right: 12px;
  vertical-align: -0.08em;
}

.page-about .about-flow-figure {
  margin: 0 0 44px;
}

.page-about .about-flow-figure img {
  max-height: 520px;
}

.page-about .about-flow-steps {
  display: grid;
  gap: 14px;
}

.page-about .about-flow-step {
  position: relative;
  background: var(--bg-card);
  border-left: 3px solid var(--red);
  padding: 22px 20px 18px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: background var(--t-base), transform var(--t-base);
}

.page-about .about-flow-step:hover,
.page-about .about-flow-step:focus-within {
  background: #232838;
  transform: translateY(-2px);
}

.page-about .about-flow-step-index {
  font-size: 14px;
  color: var(--green);
}

.page-about .about-flow-step h3 {
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
  margin: 8px 0 6px;
}

.page-about .about-flow-step-detail {
  max-height: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(245, 247, 250, 0.7);
  margin: 0;
  transition: max-height 0.4s var(--ease-out), opacity 0.3s var(--ease-out), margin 0.3s var(--ease-out);
  opacity: 0;
}

@media (max-width: 760px) {
  .page-about .about-flow-step-detail {
    max-height: 140px;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (min-width: 761px) {
  .page-about .about-flow-step:hover .about-flow-step-detail,
  .page-about .about-flow-step:focus-within .about-flow-step-detail {
    max-height: 160px;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (min-width: 600px) {
  .page-about .about-hero-stats {
    gap: 16px;
  }

  .page-about .about-process-flow {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-process-step {
    min-height: 96px;
  }

  .page-about .about-expansion-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-flow-steps {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 64px;
  }

  .page-about .about-process-team {
    grid-template-columns: 140px 1fr;
    gap: 32px;
    padding: 32px;
  }

  .page-about .about-expansion-grid {
    grid-template-columns: 1fr 1fr;
    gap: 26px;
  }

  .page-about .about-flow-steps {
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-timeline {
    padding-left: 0;
  }

  .page-about .about-timeline-line {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-item {
    width: calc(50% - 40px);
    margin-bottom: 56px;
  }

  .page-about .about-timeline-item:nth-child(even) {
    margin-left: auto;
    margin-right: 0;
    text-align: left;
    padding-left: 48px;
  }

  .page-about .about-timeline-item:nth-child(odd) {
    margin-right: auto;
    margin-left: 0;
    text-align: right;
    padding-right: 48px;
  }

  .page-about .about-timeline-item:nth-child(odd) .about-version-head {
    justify-content: flex-end;
  }

  .page-about .about-timeline-node {
    left: auto;
    right: -58px;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-node {
    right: auto;
    left: -58px;
  }

  .page-about .about-timeline-item:nth-child(odd) .about-timeline-node {
    right: -58px;
    left: auto;
  }

  .page-about .about-timeline-card {
    padding: 28px 26px 24px;
  }

  .page-about .about-section-head {
    margin-bottom: 56px;
  }

  .page-about .about-flow-steps {
    gap: 20px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-expansion-card {
    padding: 34px 30px 28px;
  }

  .page-about .about-expansion-card h3 {
    font-size: 21px;
  }

  .page-about .about-quote-block {
    padding: 52px 64px;
  }

  .page-about .about-flow-step {
    padding: 28px 22px 20px;
  }
}