.page-about {
  --about-hair: rgba(242, 237, 228, .16);
  --about-soft: rgba(242, 237, 228, .06);
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(40px, 6vw, 96px);
}

.page-about .breadcrumb {
  padding: clamp(16px, 2.4vw, 30px) 0 0;
}

/* ---------- hero ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding: clamp(26px, 4vw, 56px) 0 clamp(38px, 5vw, 74px);
  border-bottom: 2px solid var(--about-hair);
}

.page-about .about-hero__title {
  margin: clamp(14px, 1.8vw, 22px) 0 0;
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2vw, 26px) 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.08vw, 19px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .82);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: clamp(24px, 3vw, 40px) 0 0;
  padding: 2px;
  list-style: none;
  background: var(--about-hair);
  border: 2px solid var(--about-hair);
}

.page-about .about-stats > li {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-about .about-stat__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-stat__k {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cool);
}

.page-about .about-status {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--ink-2);
  border: 2px solid var(--about-hair);
  box-shadow: var(--shadow-hard);
}

.page-about .about-status__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-status__list > li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-status__k {
  font-size: 13px;
  color: var(--cool);
}

.page-about .about-status__v {
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-status__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .about-status__link {
  justify-self: start;
  padding-bottom: 2px;
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-status__link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- section shell ---------- */

.page-about .about-section {
  padding: clamp(44px, 6vw, 88px) 0;
}

.page-about .about-section__head {
  display: grid;
  gap: 10px;
  padding-bottom: clamp(16px, 2.4vw, 26px);
  margin-bottom: clamp(26px, 4vw, 46px);
  border-bottom: 2px solid var(--about-hair);
}

.page-about .about-section__head--inner {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-h2 {
  margin: 0;
  font-size: clamp(28px, 3.8vw, 52px);
  font-weight: 200;
  letter-spacing: -.01em;
  line-height: 1.16;
}

.page-about .about-lede {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 1vw, 17px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .76);
}

/* ---------- timeline ---------- */

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 10px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, rgba(107, 122, 75, .9), rgba(107, 122, 75, .08));
}

.page-about .tl-node {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  column-gap: 14px;
  padding-bottom: clamp(20px, 3vw, 34px);
}

.page-about .tl-node::before {
  content: "";
  grid-column: 1;
  grid-row: 1 / span 2;
  align-self: start;
  width: 11px;
  height: 11px;
  margin: 8px auto 0;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 5px rgba(107, 122, 75, .16);
  z-index: 1;
}

.page-about .tl-year {
  grid-column: 2;
  grid-row: 1;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--moss);
}

.page-about .tl-body {
  grid-column: 2;
  grid-row: 2;
}

.page-about .tl-detail summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 4px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-title {
  font-size: clamp(17px, 1.9vw, 23px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-detail summary::after {
  content: "展开";
  margin-left: auto;
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--rock);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-detail[open] summary::after {
  content: "收起";
  color: var(--cyan);
}

.page-about .tl-detail summary:hover .tl-title {
  color: var(--cyan);
}

.page-about .tl-detail p {
  margin: 10px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1vw, 16px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .76);
}

/* ---------- figures ---------- */

.page-about .about-figure {
  margin: 0 0 clamp(24px, 3.4vw, 42px);
  border: 2px solid var(--about-hair);
}

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

.page-about .about-figure .media-frame__cap {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--rock);
  border-top: 2px solid var(--about-hair);
}

/* ---------- roles ---------- */

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

.page-about .role-card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--ink-2);
  border: 2px solid var(--rock);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  border-color: var(--cyan);
  box-shadow: var(--shadow-cyan);
  transform: translate(-3px, -3px);
}

.page-about .role-card__no {
  color: var(--rock);
}

.page-about .role-card__name {
  margin: 0;
  font-size: clamp(19px, 1.7vw, 22px);
  font-weight: 600;
}

.page-about .role-card__num {
  margin: 0;
  font-size: clamp(30px, 3.2vw, 42px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .role-card__num span {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--cool);
}

.page-about .role-card__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 237, 228, .78);
}

.page-about .role-card__duty {
  display: grid;
  gap: 6px;
  margin: 4px 0 0;
  padding: 12px 0 0;
  list-style: none;
  border-top: 1px solid var(--about-soft);
}

.page-about .role-card__duty li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  color: var(--cool);
}

.page-about .role-card__duty li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--moss);
}

/* ---------- workflow ---------- */

.page-about .about-flow-wrap {
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--about-hair);
}

.page-about .about-flow {
  display: block;
  width: 100%;
  min-width: 700px;
  height: auto;
}

.page-about .about-flow text {
  font-family: var(--font-body);
}

.page-about .about-flow .flow-no {
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: .12em;
  fill: var(--rock);
}

.page-about .about-flow .flow-name {
  font-size: 34px;
  font-weight: 600;
  fill: #F2EDE4;
}

.page-about .about-flow .flow-desc {
  font-size: 19px;
  fill: #9AA3AD;
}

.page-about .about-workflow-notes {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-workflow-notes p {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1vw, 16px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .78);
}

/* ---------- split blocks ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .about-split__media .about-figure {
  margin-bottom: 0;
}

.page-about .about-points {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--about-hair);
}

.page-about .about-points > li {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 2vw, 22px) 0;
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-points__k {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-points p {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1vw, 16px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .78);
}

/* ---------- paper band ---------- */

.page-about .about-band--paper {
  background: var(--paper);
  color: var(--ink);
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}

.page-about .about-band--paper .about-section__head {
  border-bottom-color: rgba(14, 17, 22, .28);
}

.page-about .about-band--paper .about-lede {
  color: rgba(14, 17, 22, .74);
}

.page-about .about-scenes {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .scene-card {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--paper);
  border: 2px solid var(--ink);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .scene-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 rgba(14, 17, 22, .9);
  border-color: var(--blue);
}

.page-about .scene-card__tag {
  justify-self: start;
}

.page-about .scene-card__name {
  margin: 0;
  font-size: clamp(19px, 1.8vw, 23px);
  font-weight: 600;
  line-height: 1.4;
}

.page-about .scene-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(14, 17, 22, .78);
}

.page-about .scene-card__link a {
  display: inline-block;
  padding-bottom: 2px;
  color: var(--blue);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 2px solid var(--blue);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .scene-card__link a:hover {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- releases ---------- */

.page-about .about-versions {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--about-hair);
}

.page-about .ver-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(14px, 1.8vw, 20px) 0;
  border-bottom: 1px solid var(--about-soft);
  transition: background-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .ver-row:hover {
  background: rgba(0, 229, 255, .05);
  padding-left: 10px;
}

.page-about .ver-year {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--moss);
}

.page-about .ver-name {
  font-size: clamp(16px, 1.5vw, 19px);
  font-weight: 600;
  color: var(--paper);
}

.page-about .ver-desc {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 237, 228, .74);
}

/* ---------- cta ---------- */

.page-about .about-section--cta {
  padding-bottom: clamp(30px, 4vw, 56px);
}

.page-about .about-cta {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  padding: clamp(26px, 3.6vw, 54px);
  background: var(--blue);
  border: 2px solid var(--paper);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta .about-h2 {
  max-width: 22ch;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(15px, 1vw, 17px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .86);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-cta .btn {
  background: transparent;
  color: var(--paper);
  border-color: rgba(242, 237, 228, .6);
}

.page-about .about-cta .btn--accent {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .about-cta .btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, .55);
}

/* ---------- responsive ---------- */

@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(300px, 4fr);
    align-items: start;
  }

  .page-about .tl-node {
    grid-template-columns: 108px 24px minmax(0, 1fr);
    column-gap: 18px;
  }

  .page-about .tl-year {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    padding-top: 8px;
  }

  .page-about .tl-body {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about .tl-node::before {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-timeline::before {
    left: 135px;
  }

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

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-split--reverse .about-split__body {
    order: 1;
  }

  .page-about .about-split--reverse .about-split__media {
    order: 2;
  }

  .page-about .ver-row {
    grid-template-columns: 92px 210px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 20px;
  }

  .page-about .ver-year {
    padding-top: 0;
  }
}

@media (min-width: 1120px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}