.page-about {
  --about-rail-w: 196px;
  --about-sec-gap: clamp(36px, 5vw, 64px);
}

.page-about .about-crumbs {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: clamp(30px, 6vw, 74px) 0 clamp(36px, 6vw, 64px);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.3;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(115% 85% at 10% 0%, rgba(255, 106, 43, 0.16), transparent 58%),
    radial-gradient(95% 75% at 92% 12%, rgba(46, 230, 168, 0.1), transparent 62%),
    linear-gradient(180deg, rgba(6, 19, 31, 0.55) 0%, rgba(6, 19, 31, 0.9) 62%, var(--ink-900) 100%);
}

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

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 12px 0 18px;
  max-width: 12em;
  text-wrap: balance;
}

.page-about .about-hl {
  color: var(--orange);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 30em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 数据带 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}

.page-about .about-stat {
  background: rgba(11, 29, 44, 0.92);
  padding: 16px 16px 18px;
  display: grid;
  gap: 7px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-stat__num span {
  font-size: 13px;
  font-weight: 500;
  margin-left: 3px;
  color: var(--orange);
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  padding-top: clamp(40px, 6vw, 76px);
  padding-bottom: clamp(48px, 8vw, 100px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-body {
  min-width: 0;
}

/* ---------- 左侧时间轴 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail__cap {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
}

.page-about .about-rail__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--mint-deep) 100%);
  opacity: 0.75;
}

.page-about .about-rail__list li {
  position: relative;
  padding-left: 26px;
}

.page-about .about-rail__list li::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--line);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-rail__list li:hover::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-rail__link {
  display: flex;
  gap: 9px;
  align-items: baseline;
  text-decoration: none;
  color: var(--text-dim);
  font-size: 13.5px;
  line-height: 1.45;
  transition: color 0.18s var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--text);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--orange);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-bottom: var(--about-sec-gap);
  margin-bottom: var(--about-sec-gap);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 92px;
}

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

.page-about .about-sec__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2.5vw, 20px);
  margin-bottom: 18px;
}

.page-about .about-idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.1em;
  color: var(--orange);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 5px 7px;
  margin-top: 4px;
}

.page-about .about-sec h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 4.4vw, 32px);
  line-height: 1.26;
  letter-spacing: -0.005em;
  margin: 0;
  color: var(--text);
  text-wrap: balance;
}

.page-about .about-sec p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-sec p.about-sec__key {
  color: var(--text);
  font-size: 16.5px;
  border-left: 2px solid var(--orange);
  padding-left: 16px;
  margin-bottom: 18px;
}

/* ---------- 三条能力 ---------- */
.page-about .about-pillars {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-pillars li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 15px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-pillars__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mint);
}

/* ---------- 使用场景 ---------- */
.page-about .about-scenes {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-scenes li {
  padding: 16px 0 18px 18px;
  border-left: 2px solid var(--line);
}

.page-about .about-scenes li:nth-child(1) {
  border-left-color: var(--orange);
}

.page-about .about-scenes li:nth-child(2) {
  border-left-color: var(--mint);
}

.page-about .about-scenes li:nth-child(3) {
  border-left-color: var(--orange-soft);
}

.page-about .about-scenes li:first-child {
  padding-top: 2px;
}

.page-about .about-scenes li:last-child {
  padding-bottom: 2px;
}

.page-about .about-scenes__tag {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--text);
}

.page-about .about-scenes p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 24px 0 4px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--ink-800);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 版本里程碑 ---------- */
.page-about .about-miles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-mile {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px dashed var(--line);
}

.page-about .about-mile:last-child {
  border-bottom: 1px dashed var(--line);
}

.page-about .about-mile__ver {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.page-about .about-mile__ver::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.65;
}

.page-about .about-mile h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-sec .about-mile p {
  margin: 0;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 折叠说明 ---------- */
.page-about .about-fold {
  margin-top: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-fold summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-fold[open] summary::before {
  content: "–";
}

.page-about .about-fold__defs {
  margin: 0;
  padding: 0 16px 16px;
  display: grid;
  gap: 13px;
}

.page-about .about-fold__defs div {
  display: grid;
  gap: 3px;
}

.page-about .about-fold__defs dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mint);
}

.page-about .about-fold__defs dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 字段说明 ---------- */
.page-about .about-fields {
  list-style: none;
  margin: 22px 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

.page-about .about-fields li {
  display: grid;
  gap: 7px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--ink-800);
  min-width: 0;
}

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

.page-about .about-fields__v {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 价值条目 ---------- */
.page-about .about-values {
  margin: 22px 0 0;
  display: grid;
  gap: 14px;
}

.page-about .about-values > div {
  padding: 16px 18px;
  background: var(--ink-800);
  border-left: 3px solid var(--orange);
  border-radius: 0 5px 5px 0;
}

.page-about .about-values > div:nth-child(2) {
  border-left-color: var(--mint);
}

.page-about .about-values > div:nth-child(3) {
  border-left-color: var(--orange-soft);
}

.page-about .about-values dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 6px;
}

.page-about .about-values dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 28px;
  padding: clamp(20px, 3.5vw, 30px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 106, 43, 0.1), rgba(46, 230, 168, 0.07) 72%, transparent);
  display: grid;
  gap: 18px;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-sec p {
    font-size: 16.5px;
  }

  .page-about .about-sec .about-mile p {
    font-size: 15px;
  }

  .page-about .about-scenes p {
    font-size: 15.5px;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 84px;
  }

  .page-about .about-sec {
    scroll-margin-top: 96px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-values {
    gap: 16px;
  }
}
<<<END>>>