.page-about {
  --about-gap: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 130% at 92% 0%, rgba(34, 224, 208, 0.12), transparent 58%),
    linear-gradient(180deg, rgba(15, 27, 51, 0.7), rgba(7, 13, 26, 0) 72%);
}

.page-about .about-hero-inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-block: clamp(32px, 5vw, 76px);
}

.page-about .about-crumb {
  margin-bottom: 18px;
  font-size: 12.5px;
}

.page-about .about-kicker {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(34px, 7vw, 58px);
  line-height: 1.04;
  letter-spacing: -0.005em;
  color: var(--white);
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero-media {
  margin: 0;
}

.page-about .about-hero-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.08);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), 0 100%);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 8px;
  padding-top: clamp(28px, 5vw, 64px);
}

.page-about .about-toc {
  padding-block: 4px;
}

.page-about .about-toc-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

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

.page-about .about-toc ol::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc a {
  display: block;
  white-space: nowrap;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  border-top: 1px solid var(--line);
  padding-block: clamp(30px, 5vw, 58px);
}

.page-about .about-sections > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec-head {
  display: grid;
  gap: 4px;
  margin-bottom: 20px;
}

.page-about .about-no {
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--cyan);
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(24px, 4.2vw, 34px);
  line-height: 1.15;
  color: var(--white);
}

.page-about .about-sub {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-sec p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 01 数字带 ---------- */
.page-about .facts-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 22px;
  margin: 26px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .facts-row .fact {
  border-left: 2px solid var(--cyan);
  padding-left: 12px;
}

.page-about .facts-row .fact-num {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 32px);
  line-height: 1;
  color: var(--white);
}

.page-about .facts-row .fact-num small {
  display: inline-block;
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--cyan);
  vertical-align: 2px;
}

.page-about .facts-row .fact-label {
  margin: 8px 0 0;
  max-width: none;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 02 流程 ---------- */
.page-about .flow-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-item {
  position: relative;
  padding: 18px 0 18px 26px;
  border-top: 1px solid var(--line);
}

.page-about .flow-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .flow-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--bg-deep);
}

.page-about .flow-no {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .flow-item h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .flow-item p {
  margin: 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-figure--wide img {
  aspect-ratio: 12 / 7;
}

/* ---------- 03 团队 ---------- */
.page-about .team-lines {
  display: grid;
  gap: 14px;
  margin: 24px 0 22px;
}

.page-about .team-line {
  padding: 14px 16px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .team-line:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .team-line-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .team-count {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  color: var(--white);
}

.page-about .team-name {
  font-size: 14px;
  color: var(--white);
}

.page-about .team-pct {
  margin-left: auto;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .team-track {
  height: 6px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--bg-deep);
  overflow: hidden;
}

.page-about .team-fill {
  display: block;
  width: var(--w, 30%);
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 224, 208, 0.3));
  transition: background 0.18s var(--ease);
}

.page-about .team-line--tech .team-fill { --w: 42%; }
.page-about .team-line--edit .team-fill { --w: 32%; }
.page-about .team-line--ops .team-fill { --w: 26%; }

.page-about .team-line:hover .team-fill {
  background: linear-gradient(90deg, var(--flame), rgba(255, 90, 45, 0.35));
}

.page-about .team-role {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.68;
  color: var(--muted);
  transition: color 0.18s var(--ease);
}

.page-about .team-line:hover .team-role {
  color: var(--white);
}

/* ---------- 04 版本演进 ---------- */
.page-about .ver-axis {
  display: block;
  width: 100%;
  height: auto;
  margin: 26px 0 6px;
  overflow: visible;
}

.page-about .ver-axis .ver-line {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .ver-axis .ver-dot {
  fill: var(--cyan);
}

.page-about .ver-axis .ver-dot--now {
  fill: var(--flame);
}

.page-about .ver-axis .ver-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .ver-list {
  position: relative;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ver-list::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: var(--line);
}

.page-about .ver-item {
  position: relative;
  padding: 0 0 24px 24px;
}

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

.page-about .ver-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 224, 208, 0.14);
}

.page-about .ver-item:last-child::before {
  background: var(--flame);
  box-shadow: 0 0 0 3px rgba(255, 90, 45, 0.16);
}

.page-about .ver-node {
  display: inline-block;
  margin-bottom: 4px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .ver-item h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .ver-item p {
  margin: 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 05 坚持 ---------- */
.page-about .about-sec .about-quote {
  margin: 0 0 24px;
  padding: 4px 0 4px 18px;
  max-width: 40ch;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-narrow);
  font-size: clamp(17px, 2.6vw, 21px);
  line-height: 1.62;
  color: var(--white);
}

.page-about .keep-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .keep-item {
  padding: 18px 18px 20px;
  background: var(--bg-deep);
  border-left: 3px solid transparent;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .keep-item:hover {
  background: var(--bg-panel);
  border-left-color: var(--flame);
}

.page-about .keep-item h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .keep-item p {
  margin: 0;
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(135deg, rgba(34, 224, 208, 0.1), rgba(255, 90, 45, 0.06) 62%, transparent),
    var(--bg-panel);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  color: var(--white);
}

.page-about .about-cta p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .facts-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-hero-media {
    align-self: stretch;
  }

  .page-about .about-hero-img {
    height: 100%;
    aspect-ratio: auto;
    min-height: 340px;
  }

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

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 186px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
  }

  .page-about .about-toc ol {
    flex-direction: column;
    gap: 0;
    border-left: 1px solid var(--line);
    overflow: visible;
  }

  .page-about .about-toc a {
    position: relative;
    padding: 11px 0 11px 16px;
    border: 0;
    border-radius: 0;
    font-size: 13.5px;
  }

  .page-about .about-toc a::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 9px;
    bottom: 9px;
    width: 2px;
    background: transparent;
    transition: background 0.18s var(--ease);
  }

  .page-about .about-toc a:hover::before,
  .page-about .about-toc a:focus-visible::before {
    background: var(--cyan);
  }

  .page-about .flow-item {
    padding-left: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-line,
  .page-about .team-fill,
  .page-about .team-role,
  .page-about .keep-item,
  .page-about .about-toc a,
  .page-about .about-toc a::before {
    transition: none;
  }

  .page-about .team-line:hover {
    transform: none;
  }
}