.page-about {
  --about-band-1: #1B3526;
  --about-band-2: #142A1D;
  --about-band-3: #0E1F16;
  --about-gap: clamp(18px, 3vw, 30px);

  display: block;
  background: var(--deep-night);
  color: var(--cool-white);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  padding-bottom: clamp(48px, 7vw, 88px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-block: clamp(16px, 2.6vw, 26px) 10px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  align-items: center;
  padding-block: clamp(16px, 3vw, 32px) clamp(6px, 1.5vw, 14px);
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: var(--fs-label);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neon-lime);
}

.page-about .about-kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: currentColor;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  max-width: 20em;
  font-size: var(--fs-h1);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .about-lead {
  margin: 0 0 14px;
  max-width: 34em;
  color: var(--cool-white);
}

.page-about .about-hero__note {
  margin: 0 0 22px;
  max-width: 34em;
  font-size: var(--fs-note);
  color: var(--grey-green);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--deep-line);
  border-radius: var(--radius-pill);
  background: var(--panel-green);
  font-size: var(--fs-note);
}

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--neon-lime);
}

.page-about .about-hero__facts em {
  font-style: normal;
  color: var(--grey-green);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-panel);
  overflow: hidden;
  background: var(--panel-green);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 画板 ---------- */

.page-about .about-board {
  position: relative;
  padding: clamp(24px, 4vw, 48px) clamp(20px, 3.4vw, 40px);
  border: 1px solid transparent;
  border-radius: var(--radius-panel);
  background: var(--panel-green);
  transition: border-color 240ms ease;
  scroll-margin-top: 90px;
}

.page-about .about-board.is-active {
  border-color: var(--neon-dim);
}

.page-about .about-board__head {
  max-width: 46em;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-board__head h2 {
  margin: 8px 0 12px;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-board__head p {
  margin: 0;
  color: var(--grey-green);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-version::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image:
    linear-gradient(to right, var(--deep-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--deep-line) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.22;
  pointer-events: none;
}

.page-about .about-version > * {
  position: relative;
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--neon-dim), var(--deep-line) 35%, var(--deep-line));
}

.page-about .about-tl__item {
  position: relative;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 17px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border: 3px solid var(--neon-dim);
  border-radius: 50%;
  background: var(--deep-night);
  transition: background-color 240ms ease, border-color 240ms ease;
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:has(details[open])::before {
  background: var(--neon-lime);
  border-color: var(--neon-lime);
}

.page-about .about-tl__item--current::before {
  border-color: var(--neon-lime);
}

.page-about .about-tl__details {
  border: 1px solid var(--deep-line);
  border-radius: var(--radius-lg);
  background: var(--deep-night);
  transition: border-color 240ms ease;
}

.page-about .about-tl__details:hover,
.page-about .about-tl__details[open] {
  border-color: var(--neon-dim);
}

.page-about .about-tl__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  list-style: none;
  cursor: pointer;
}

.page-about .about-tl__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl__summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--neon-dim);
}

.page-about .about-tl__details[open] .about-tl__summary::after {
  content: "–";
}

.page-about .about-tl__num {
  flex: none;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--neon-lime);
}

.page-about .about-tl__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cool-white);
}

.page-about .about-tl__detail {
  padding: 0 18px 16px;
  font-size: var(--fs-note);
  color: var(--grey-green);
}

.page-about .about-tl__detail p {
  margin: 0;
  max-width: 46em;
}

/* ---------- 团队色带 ---------- */

.page-about .about-team {
  display: grid;
  gap: 10px;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  list-style: none;
}

@media (min-width: 820px) {
  .page-about .about-team {
    grid-template-columns: 1.25fr 1fr 0.82fr;
    align-items: stretch;
  }
}

.page-about .about-team__band {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 208px;
  padding: clamp(20px, 2.8vw, 30px);
  border: 1px solid var(--deep-line);
  border-radius: var(--radius-lg);
  background: var(--about-band-1);
}

.page-about .about-team__band--2 {
  background: var(--about-band-2);
  min-height: 194px;
}

.page-about .about-team__band--3 {
  background: var(--about-band-3);
  min-height: 180px;
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon-lime);
}

.page-about .about-team__num small {
  margin-left: 6px;
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0;
  color: var(--grey-green);
}

.page-about .about-team__text {
  margin-top: auto;
  padding-top: 18px;
}

.page-about .about-team__role {
  margin: 0 0 8px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: var(--fs-note);
  color: var(--grey-green);
}

.page-about .about-shot {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--deep-night);
  border: 1px solid var(--deep-line);
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-shot figcaption {
  padding: 12px 18px;
  border-top: 1px solid var(--deep-line);
  font-size: var(--fs-note);
  color: var(--grey-green);
}

/* ---------- 标注流程 ---------- */

.page-about .about-flow-wrap {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

@media (min-width: 940px) {
  .page-about .about-flow-wrap {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-flow {
  display: grid;
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__node {
  position: relative;
  padding-top: 20px;
}

.page-about .about-flow__node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--deep-line) 0 6px, transparent 6px 14px);
}

.page-about .about-flow__node::after {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon-dim);
}

.page-about .about-flow__details {
  border: 1px solid var(--deep-line);
  border-radius: var(--radius-lg);
  background: var(--deep-night);
  transition: border-color 240ms ease;
}

.page-about .about-flow__details:hover,
.page-about .about-flow__details[open] {
  border-color: var(--neon-dim);
}

.page-about .about-flow__summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
}

.page-about .about-flow__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-flow__time {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1;
  color: var(--neon-lime);
}

.page-about .about-flow__time small {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--grey-green);
}

.page-about .about-flow__name {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--cool-white);
}

.page-about .about-flow__checks {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0 18px 18px;
  list-style: none;
  font-size: var(--fs-note);
  color: var(--grey-green);
}

.page-about .about-flow__checks li {
  position: relative;
  padding-left: 18px;
}

.page-about .about-flow__checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.82em;
  width: 8px;
  height: 2px;
  background: var(--neon-dim);
}

.page-about .about-flow__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--deep-night);
  border: 1px solid var(--deep-line);
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 620;
  object-fit: cover;
}

.page-about .about-flow__figure figcaption {
  padding: 12px 18px;
  border-top: 1px solid var(--deep-line);
  font-size: var(--fs-note);
  color: var(--grey-green);
}

/* ---------- 地域与合规 ---------- */

.page-about .about-legal__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 38px);
}

@media (min-width: 900px) {
  .page-about .about-legal__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

.page-about .about-legal__main h2 {
  margin: 8px 0 14px;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-legal__main p {
  margin: 0 0 12px;
  max-width: 34em;
  color: var(--cool-white);
}

.page-about .about-legal__main p:last-child {
  margin-bottom: 0;
  color: var(--grey-green);
  font-size: var(--fs-note);
}

.page-about .about-legal__list {
  margin: 0;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--deep-line);
  border-radius: var(--radius-lg);
  background: var(--deep-night);
  display: grid;
  gap: 14px;
}

.page-about .about-legal__row {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--deep-line);
}

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

.page-about .about-legal__row dt {
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neon-dim);
}

.page-about .about-legal__row dd {
  margin: 0;
  font-size: var(--fs-note);
  color: var(--cool-white);
}

.page-about .about-legal__row .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 章节跳转 ---------- */

.page-about .about-jump {
  padding-block: clamp(20px, 3.4vw, 36px) 0;
}

.page-about .about-jump__title {
  margin: 0 0 18px;
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-jump__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .about-jump__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-jump__list a {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--deep-line);
  border-radius: var(--radius-lg);
  background: var(--panel-green);
  color: inherit;
  text-decoration: none;
  transition: border-color 200ms ease, background-color 200ms ease;
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible {
  border-color: var(--neon-lime);
  background: var(--about-band-1);
}

.page-about .about-jump__name {
  display: block;
  margin-bottom: 4px;
  font-weight: 700;
}

.page-about .about-jump__desc {
  display: block;
  font-size: var(--fs-note);
  color: var(--grey-green);
}

@media (max-width: 520px) {
  .page-about .about-board {
    border-radius: var(--radius-lg);
  }

  .page-about .about-tl {
    padding-left: 24px;
  }

  .page-about .about-tl::before {
    left: 6px;
  }

  .page-about .about-tl__item::before {
    left: -24px;
    top: 16px;
    width: 12px;
    height: 12px;
    border-width: 2px;
  }

  .page-about .about-tl__summary {
    gap: 10px;
    padding: 13px 14px;
  }

  .page-about .about-tl__detail {
    padding-inline: 14px;
  }
}