.page-about {
  --about-grad: linear-gradient(90deg, var(--red-deep) 0%, var(--red) 58%, rgba(255, 46, 63, 0) 100%);
  --about-ghost: rgba(242, 244, 248, 0.055);
  --about-soft: rgba(35, 43, 58, 0.72);
  position: relative;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(112px, 13vw, 168px) 0 clamp(48px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 100% at 86% 6%, rgba(255, 46, 63, 0.16), transparent 58%),
    radial-gradient(90% 90% at 4% 96%, rgba(27, 77, 228, 0.16), transparent 60%),
    var(--ink);
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 30px;
}

.page-about .about-kicker {
  margin: 0 0 22px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-h1 {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 200;
  font-size: clamp(34px, 6.6vw, 86px);
  line-height: 1.06;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .about-h1-line {
  display: inline-block;
  color: var(--paper);
  border-bottom: 2px solid var(--red);
  padding-bottom: 0.08em;
}

.page-about .about-hero-foot {
  margin-top: clamp(34px, 5vw, 58px);
  padding-top: clamp(24px, 3vw, 34px);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 36px 48px;
  align-items: start;
}

.page-about .about-lede {
  margin: 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper-2);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 24px;
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.2vw, 34px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fog);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-band {
  height: 2px;
  width: min(100% - 40px, 1280px);
  margin: 0 auto;
  background: var(--about-grad);
}

.page-about .about-chapter {
  position: relative;
  padding: clamp(56px, 7vw, 100px) 0;
}

.page-about .about-head {
  position: relative;
  margin-bottom: clamp(34px, 4.4vw, 58px);
  padding-left: clamp(0px, 5vw, 76px);
}

.page-about .about-num-ghost {
  position: absolute;
  top: -0.14em;
  left: 0;
  z-index: 0;
  font-size: clamp(84px, 13vw, 186px);
  font-weight: 200;
  line-height: 1;
  color: var(--about-ghost);
  pointer-events: none;
  user-select: none;
}

.page-about .about-title {
  position: relative;
  z-index: 1;
  margin: 0 0 18px;
  font-family: var(--font-title);
  font-weight: 200;
  font-size: clamp(25px, 4vw, 50px);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.page-about .about-sub-lede {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--fog);
}

.page-about .about-row {
  row-gap: 40px;
  align-items: start;
}

.page-about .a-col-3 { grid-column: span 3; }
.page-about .a-col-4 { grid-column: span 4; }
.page-about .a-col-5 { grid-column: span 5; }
.page-about .a-col-6 { grid-column: span 6; }
.page-about .a-col-7 { grid-column: span 7; }
.page-about .a-col-12 { grid-column: span 12; }
.page-about .a-start-6 { grid-column-start: 6; }
.page-about .a-start-7 { grid-column-start: 7; }
.page-about .a-start-8 { grid-column-start: 8; }
.page-about .a-start-10 { grid-column-start: 10; }

.page-about .about-sub {
  margin: 0 0 18px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

/* ---------- 正文与图 ---------- */
.page-about .about-prose p {
  margin: 0 0 1.15em;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--paper-2);
}

.page-about .about-prose p:first-child {
  font-size: 17.5px;
  color: var(--paper);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

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

.page-about .about-figure .about-shot {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-top: 2px solid var(--red);
}

.page-about .media-caption {
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-about .about-wide {
  margin: clamp(36px, 4.5vw, 58px) 0 0;
}

.page-about .about-wide img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-top: 2px solid var(--red);
  border-bottom: 1px solid var(--line);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line);
}

.page-about .about-tl-node {
  position: relative;
  padding-bottom: clamp(28px, 3.6vw, 46px);
}

.page-about .about-tl-node:last-child {
  padding-bottom: 0;
}

.page-about .about-tl-dot {
  position: absolute;
  left: -30px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(255, 46, 63, 0.14);
}

.page-about .about-tl-when {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-tl-title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .about-tl-body p {
  margin: 0;
  max-width: 72ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper-2);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .about-flow li {
  position: relative;
  padding: 0 0 24px 48px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}

.page-about .about-flow li:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-flow li::before {
  counter-increment: flow;
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .about-flow h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper-2);
}

/* ---------- 边注 ---------- */
.page-about .about-aside {
  border-top: 2px solid var(--red);
  padding-top: 20px;
}

.page-about .about-aside-title {
  margin: 0 0 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.page-about .about-aside-list {
  margin: 0;
}

.page-about .about-aside-list dt {
  margin: 0 0 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-about .about-aside-list dd {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  color: var(--gold);
}

.page-about .about-aside-note {
  margin: 4px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--fog);
}

/* ---------- 团队条形 ---------- */
.page-about .about-bars {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .about-bars li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 12px;
  margin-bottom: 15px;
}

.page-about .about-bar-label {
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--paper-2);
}

.page-about .about-bar {
  position: relative;
  display: block;
  height: 10px;
  background: var(--about-soft);
  overflow: hidden;
}

.page-about .about-bar i {
  display: block;
  height: 100%;
  background: var(--red);
  transition: width 0.6s var(--ease);
}

.page-about .about-bars li:nth-child(1) .about-bar i { width: 36%; }
.page-about .about-bars li:nth-child(2) .about-bar i { width: 26%; background: var(--blue); }
.page-about .about-bars li:nth-child(3) .about-bar i { width: 21%; background: var(--blue-text); }
.page-about .about-bars li:nth-child(4) .about-bar i { width: 17%; background: var(--fog); }

.page-about .about-bar-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  text-align: right;
  color: var(--paper);
}

.page-about .about-note {
  margin: 0;
  padding: 16px 18px;
  border-left: 2px solid var(--blue);
  background: rgba(27, 77, 228, 0.08);
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-2);
}

/* ---------- 手册与术语 ---------- */
.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-list li {
  position: relative;
  padding: 14px 0 14px 22px;
  border-bottom: 1px solid var(--line);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--paper-2);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 10px;
  height: 2px;
  background: var(--red);
}

.page-about .about-doc p {
  margin: 0 0 1.1em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-2);
}

.page-about .about-doc-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 里程碑 ---------- */
.page-about .about-mile-figure {
  margin: 0;
}

.page-about .about-mile-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 7%, 100% 100%, 0 93%);
}

.page-about .about-mile {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.page-about .about-mile li {
  position: relative;
  padding: 28px 22px 32px;
  background: var(--panel);
}

.page-about .about-mile li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--red);
}

.page-about .about-mile li:nth-child(2)::before { background: var(--blue-text); }
.page-about .about-mile li:nth-child(3)::before { background: var(--gold); }

.page-about .about-mile-year {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 4.4vw, 50px);
  font-weight: 200;
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-mile h3 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .about-mile p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-2);
}

.page-about .about-honor {
  margin: 28px 0 0;
  padding: 18px 22px;
  border-left: 2px solid var(--gold);
  background: rgba(232, 179, 74, 0.07);
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-2);
}

/* ---------- 下一步与收束 ---------- */
.page-about .about-next {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.page-about .about-next li {
  padding-top: 20px;
  border-top: 2px solid var(--red);
}

.page-about .about-next li:nth-child(2) { border-top-color: var(--blue); }
.page-about .about-next li:nth-child(3) { border-top-color: var(--gold); }

.page-about .about-next h3 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .about-next p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper-2);
}

.page-about .about-cta-band {
  margin-top: clamp(36px, 4.5vw, 58px);
  padding: 28px 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px 24px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--red);
  background: linear-gradient(100deg, rgba(140, 20, 32, 0.34), rgba(27, 77, 228, 0.16) 68%, rgba(7, 8, 12, 0) 100%);
}

.page-about .about-cta-band p:first-child {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

/* ---------- 右侧索引 ---------- */
.page-about .about-index {
  display: none;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fog);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .about-index-list a .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--line);
  transition: color 0.2s var(--ease);
}

.page-about .about-index-list a:hover {
  color: var(--paper);
}

.page-about .about-index-list a.is-current {
  color: var(--red);
}

.page-about .about-index-list a.is-current .mono {
  color: var(--red);
}

@media (min-width: 1240px) {
  .page-about .about-index {
    display: block;
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .page-about .about-hero-foot {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

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

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

@media (max-width: 860px) {
  .page-about .grid12 {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

  .page-about .a-col-3,
  .page-about .a-col-4,
  .page-about .a-col-5,
  .page-about .a-col-6,
  .page-about .a-col-7,
  .page-about .a-col-12 {
    grid-column: 1 / -1;
  }

  .page-about .a-start-6,
  .page-about .a-start-7,
  .page-about .a-start-8,
  .page-about .a-start-10 {
    grid-column-start: auto;
  }

  .page-about .about-head {
    padding-left: 0;
  }

  .page-about .about-num-ghost {
    font-size: 76px;
    top: -0.32em;
    opacity: 0.85;
  }

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

  .page-about .about-next {
    gap: 24px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-bars li {
    grid-template-columns: 84px minmax(0, 1fr) 30px;
    gap: 10px;
  }

  .page-about .about-cta-band {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 520px) {
  .page-about .about-hero {
    padding-top: 100px;
  }

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

  .page-about .about-bars li {
    grid-template-columns: 76px minmax(0, 1fr) 28px;
  }

  .page-about .about-bar-label {
    font-size: 12.5px;
  }

  .page-about .about-cta-actions {
    width: 100%;
  }

  .page-about .about-cta-actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}