.page-about {
  --about-line: rgba(234, 246, 255, 0.14);
  --about-line-dark: rgba(7, 17, 31, 0.12);
  --about-aurora-soft: rgba(45, 226, 196, 0.12);
  background: var(--ink-950);
  color: var(--ice-100);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 5vw, 56px) clamp(34px, 6vw, 76px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 10px;
  background: repeating-linear-gradient(
    90deg,
    var(--ice-16) 0 1px,
    transparent 1px 28px
  );
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-hero__rail {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--aurora-400);
}

.page-about .about-hero__pagenum {
  color: var(--lime-400);
}

.page-about .about-hero__railrule {
  display: block;
  width: 56px;
  height: 1px;
  background: var(--about-line);
}

.page-about .about-hero__raillabel {
  color: var(--ice-50);
  letter-spacing: 0.28em;
  font-size: 10px;
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 12px 0 18px;
}

.page-about .about-hero__lead {
  max-width: 40ch;
  color: var(--ice-70);
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.85;
  margin: 0 0 24px;
}

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

.page-about .about-hero__facts {
  border: 1px solid var(--ice-16);
  background-image: linear-gradient(158deg, var(--about-aurora-soft), rgba(11, 39, 72, 0.72));
  padding: 20px 20px 18px;
  display: grid;
  gap: 14px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-notch)), calc(100% - var(--cut-notch)) 100%, 0 100%);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(234, 246, 255, 0.18);
}

.page-about .about-fact:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-fact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ice-50);
}

.page-about .about-fact__value {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  color: var(--paper-0);
}

.page-about .about-fact__unit {
  font-size: 13px;
  font-family: var(--font-sans);
  font-weight: 400;
  color: var(--aurora-400);
  margin-left: 3px;
}

.page-about .about-hero__factnote {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ice-50);
  border-top: 1px solid var(--ice-16);
  padding-top: 12px;
}

/* ---------- Index rail ---------- */
.page-about .about-index {
  border-bottom: 1px solid var(--about-line);
  background: var(--ink-950);
}

.page-about .about-index__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-block: 12px;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--ice-16);
  color: var(--ice-70);
  text-decoration: none;
  font-size: 13px;
  font-family: var(--font-sans);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__link span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--lime-400);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--aurora-400);
  color: var(--paper-0);
  background: rgba(45, 226, 196, 0.08);
  outline: none;
}

/* ---------- Section shell ---------- */
.page-about .about-sec {
  padding-block: clamp(44px, 7vw, 92px);
}

.page-about .about-sec__head {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1;
  color: var(--aurora-400);
  letter-spacing: 0.04em;
}

.page-about .about-sec__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.3;
  margin: 0 0 12px;
  color: var(--ice-100);
}

.page-about .about-sec__sub {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice-70);
}

/* ---------- Origin ---------- */
.page-about .about-sec--origin {
  border-bottom: 1px solid var(--about-line);
}

.page-about .origin {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .origin__text p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--ice-70);
}

.page-about .origin__text p:first-child {
  color: var(--ice-100);
}

.page-about .origin__figure {
  border: 1px solid var(--ice-16);
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .figure__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ice-50);
  padding: 10px 2px 0;
  line-height: 1.6;
}

/* rhythm svg */
.page-about .rhythm-wrap {
  margin-top: clamp(28px, 5vw, 52px);
  border-top: 1px solid var(--about-line);
  padding-top: 22px;
}

.page-about .rhythm {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .rhythm__track {
  stroke: var(--ice-16);
  stroke-width: 2;
}

.page-about .rhythm__tracklive {
  stroke: var(--aurora-400);
  stroke-width: 2;
  stroke-dasharray: 5 11;
  opacity: 0.85;
}

.page-about .rhythm__node {
  fill: var(--lime-400);
}

.page-about .rhythm__label {
  fill: var(--ice-100);
  font-family: var(--font-sans);
  font-size: 14px;
}

.page-about .rhythm__code {
  fill: var(--ice-50);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .rhythm__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ice-50);
}

/* ---------- Lines (paper) ---------- */
.page-about .about-sec--lines {
  background: var(--paper-0);
  color: var(--ink-950);
}

.page-about .about-sec--lines .about-sec__num {
  color: var(--orange-500);
}

.page-about .about-sec--lines .about-sec__title {
  color: var(--ink-950);
}

.page-about .about-sec--lines .about-sec__sub {
  color: var(--ink-70);
}

.page-about .lines {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .lines__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .line {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .line__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate-600);
  padding-top: 4px;
}

.page-about .line__name {
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--ink-950);
  grid-column: 2;
}

.page-about .line__desc {
  margin: 4px 0 0;
  grid-column: 2;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .lines__aside {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .lines__figure {
  border: 1px solid var(--about-line-dark);
  background: var(--ice-100);
}

.page-about .about-sec--lines .figure__caption {
  color: var(--slate-600);
}

.page-about .lines__meta {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  background: var(--ink-950);
  color: var(--ice-100);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .lines__metanum {
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 0.9;
  color: var(--lime-400);
}

.page-about .lines__metatext {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ice-70);
}

/* ---------- Quality ---------- */
.page-about .about-sec--quality {
  border-bottom: 1px solid var(--about-line);
}

.page-about .quality {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: minmax(0, 1fr);
}

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

.page-about .check {
  border: 1px solid var(--ice-16);
  background-image: linear-gradient(140deg, rgba(11, 39, 72, 0.9), rgba(7, 17, 31, 0.7));
  padding: 18px 18px 20px;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 4px 14px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .check:hover {
  border-color: var(--aurora-400);
  transform: translateX(3px);
}

.page-about .check__mark {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--aurora-400);
  grid-row: span 2;
}

.page-about .check__title {
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.03em;
  color: var(--paper-0);
}

.page-about .check__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ice-70);
}

.page-about .quality__figure {
  border: 1px solid var(--ice-16);
  align-self: start;
}

/* ---------- Team (light) ---------- */
.page-about .about-sec--team {
  background: var(--ice-100);
  color: var(--ink-950);
}

.page-about .about-sec--team .about-sec__num {
  color: var(--orange-500);
}

.page-about .about-sec--team .about-sec__title {
  color: var(--ink-950);
}

.page-about .about-sec--team .about-sec__sub {
  color: var(--ink-70);
}

.page-about .team {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .team__roles {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .role {
  padding: 16px 16px 18px;
  background: var(--paper-0);
  border-left: 3px solid var(--aurora-400);
}

.page-about .role__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate-600);
}

.page-about .role__name {
  margin: 6px 0 8px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--ink-950);
}

.page-about .role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-70);
}

.page-about .team__partners {
  background: var(--ink-950);
  color: var(--ice-100);
  padding: 22px 20px 24px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .team__partnerstitle {
  margin: 0 0 4px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--aurora-400);
}

.page-about .partnerstat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(234, 246, 255, 0.2);
}

.page-about .partnerstat__num {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--lime-400);
}

.page-about .partnerstat__label {
  font-size: 13px;
  color: var(--ice-70);
}

.page-about .team__partnersnote {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ice-70);
}

.page-about .team__partnerslink {
  justify-self: start;
  margin-top: 4px;
  font-size: 13px;
  color: var(--orange-500);
  text-decoration: none;
  border-bottom: 1px solid var(--orange-500);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team__partnerslink:hover,
.page-about .team__partnerslink:focus-visible {
  color: var(--aurora-400);
  border-color: var(--aurora-400);
  outline: none;
}

/* ---------- Scale ---------- */
.page-about .about-sec--scale {
  background: var(--blue-900);
  border-bottom: 1px solid var(--about-line);
}

.page-about .scale {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .scale__stats {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .stat {
  border: 1px solid var(--ice-16);
  padding: 16px 16px 18px;
  display: grid;
  gap: 4px;
  align-content: start;
  background: rgba(7, 17, 31, 0.35);
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 38px);
  line-height: 1;
  color: var(--aurora-400);
}

.page-about .stat__plus {
  font-size: 15px;
  color: var(--lime-400);
  margin-left: 2px;
}

.page-about .stat__unit {
  font-size: 12px;
  color: var(--ice-50);
  letter-spacing: 0.06em;
}

.page-about .stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ice-70);
  margin-top: 4px;
}

.page-about .scale__records {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ice-16);
}

.page-about .record {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ice-16);
}

.page-about .record__term {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--lime-400);
}

.page-about .record__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ice-70);
}

/* ---------- Milestones ---------- */
.page-about .about-filter {
  margin-bottom: 8px;
}

.page-about .about-filter .filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .about-filter__status {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ice-50);
}

.page-about .milestones {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .milestone {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .milestone:hover {
  background: rgba(45, 226, 196, 0.05);
  transform: translateX(4px);
}

.page-about .milestone__serial {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ice-50);
  padding-top: 3px;
}

.page-about .milestone__body {
  grid-column: 2;
}

.page-about .milestone__stage {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--ink-950);
  background: var(--lime-400);
  padding: 3px 8px;
  margin-bottom: 8px;
}

.page-about .milestone__title {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.45;
  color: var(--paper-0);
}

.page-about .milestone__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ice-70);
}

.page-about .milestone__text a {
  color: var(--aurora-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .milestone__text a:hover,
.page-about .milestone__text a:focus-visible {
  color: var(--orange-500);
  outline: none;
}

.page-about .milestone__year {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange-500);
  margin-top: 8px;
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  padding-block: clamp(40px, 6vw, 80px);
  background-image: linear-gradient(120deg, rgba(45, 226, 196, 0.16), rgba(255, 106, 42, 0.12));
  border-top: 1px solid var(--about-line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

.page-about .about-cta__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.32;
  margin: 0 0 12px;
  color: var(--paper-0);
}

.page-about .about-cta__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ice-70);
}

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

/* ---------- Media ---------- */
@media (min-width: 620px) {
  .page-about .team__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .record {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: 56px minmax(0, 1fr) 268px;
    align-items: start;
  }

  .page-about .about-hero__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 8px;
  }

  .page-about .about-hero__railrule {
    width: 1px;
    height: 72px;
  }

  .page-about .about-hero__raillabel {
    writing-mode: vertical-rl;
    letter-spacing: 0.36em;
  }

  .page-about .about-sec__head {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: start;
    gap: clamp(16px, 3vw, 32px);
  }

  .page-about .about-sec__num {
    font-size: 46px;
    padding-top: 4px;
  }

  .page-about .origin {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }

  .page-about .lines {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .quality {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .team {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

  .page-about .scale {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .milestone {
    grid-template-columns: 48px minmax(0, 1fr) 72px;
    gap: 6px 20px;
    align-items: start;
  }

  .page-about .milestone__year {
    grid-column: 3;
    grid-row: 1;
    text-align: right;
    margin-top: 6px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 36px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__title {
    max-width: 18ch;
  }

  .page-about .team__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .check,
  .page-about .milestone,
  .page-about .about-index__link,
  .page-about .team__partnerslink {
    transition: none;
  }

  .page-about .check:hover,
  .page-about .milestone:hover {
    transform: none;
  }
}