.page-about {
  --about-num-col: clamp(78px, 8.6vw, 124px);
  --about-aside-col: clamp(150px, 15vw, 208px);
  --about-chapter-gap: clamp(20px, 3.4vw, 44px);
  background: var(--ink);
  color: var(--paper-soft);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .about-crumb {
  padding-top: clamp(16px, 2.6vw, 28px);
}

.page-about .breadcrumb {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb a {
  color: var(--paper-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold-bright);
  border-bottom-color: var(--line-gold-strong);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-gold-strong);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.6vw, 58px) 0 clamp(30px, 5vw, 62px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -6%;
  right: -12%;
  width: 66%;
  height: 112%;
  background: linear-gradient(152deg, rgba(31, 92, 74, 0.55), rgba(31, 92, 74, 0) 72%);
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(29px, 5.2vw, 54px);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 14px 0 0;
  max-width: 17em;
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.95;
  color: var(--paper-soft);
}

.page-about .about-hero__meta {
  margin: 0;
  padding: 16px 0 0;
  display: grid;
  gap: 14px;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-hero__meta div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-hero__meta dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-hero__meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1;
  color: var(--gold-bright);
}

/* ---------- 索引条 ---------- */

.page-about .about-main {
  padding-top: clamp(16px, 2.6vw, 30px);
}

.page-about .about-index {
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-soft);
  padding: 12px 0;
}

.page-about .about-index ol {
  display: flex;
  gap: clamp(14px, 2.6vw, 34px);
  list-style: none;
  margin: 0;
  padding: 0 2px 4px;
  overflow-x: auto;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding: 6px 0;
  font-size: 13px;
  color: var(--paper-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
  min-height: 44px;
  align-items: center;
}

.page-about .about-index a .num {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--line-gold-strong);
}

.page-about .about-index a.is-active {
  color: var(--gold-bright);
  border-bottom-color: var(--gold);
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 22px);
  padding: clamp(30px, 5vw, 56px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: clamp(80px, 12vh, 128px);
}

.page-about .about-chapters .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(24px, 4vw, 44px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 11vw, 62px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-chapter__cn {
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--mist);
}

.page-about .about-chapter__body {
  display: flow-root;
  min-width: 0;
  max-width: 64ch;
}

.page-about .about-chapter__body > h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 3.1vw, 33px);
  line-height: 1.32;
  color: var(--paper);
  margin: 0 0 0.72em;
}

.page-about .about-chapter__body > p {
  margin: 0 0 1.15em;
  font-size: clamp(15px, 1.08vw, 16.5px);
  line-height: 1.95;
  color: var(--paper-soft);
}

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

/* ---------- 旁注 ---------- */

.page-about .about-note {
  border-left: 1px solid var(--line-gold);
  padding-left: 14px;
}

.page-about .about-note summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  padding: 6px 0;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

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

.page-about .about-note summary::after {
  content: "＋";
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--mist);
  transition: color 0.18s ease;
}

.page-about .about-note[open] summary::after {
  content: "－";
  color: var(--clay);
}

.page-about .about-note summary:hover {
  color: var(--gold-bright);
}

.page-about .about-note p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--paper-dim);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-timeline li {
  position: relative;
  padding: 20px 0 20px 22px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-timeline li:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line-gold-strong), rgba(198, 161, 91, 0));
}

.page-about .about-timeline li::after {
  content: "";
  position: absolute;
  left: -3px;
  top: 27px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(63, 208, 201, 0.7);
}

.page-about .about-timeline__ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
  border: 1px solid var(--line-gold-strong);
  border-radius: var(--radius);
  padding: 2px 9px;
  margin-bottom: 9px;
}

.page-about .about-timeline h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 6px;
}

.page-about .about-timeline p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--paper-dim);
}

/* ---------- 图 ---------- */

.page-about .about-figure {
  margin: 26px 0 4px;
  max-width: 100%;
}

.page-about .about-figure--narrow {
  max-width: 420px;
}

.page-about .about-figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--celadon), var(--ink-deep));
  box-shadow: var(--shadow-paper);
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__media--square {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure__media--tall {
  aspect-ratio: 4 / 5;
}

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

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 适用人群 ---------- */

.page-about .about-audience {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-audience li {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(165deg, rgba(31, 92, 74, 0.24), rgba(11, 42, 34, 0.94));
}

.page-about .about-audience__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--clay);
}

.page-about .about-audience h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.4;
  color: var(--paper);
  margin: 0;
}

.page-about .about-audience p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--paper-dim);
}

.page-about .about-audience a {
  align-self: flex-start;
  margin-top: auto;
  padding-bottom: 2px;
  font-size: 13px;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold-strong);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-audience a:hover,
.page-about .about-audience a:focus-visible {
  color: var(--gold-bright);
  border-bottom-color: var(--gold-bright);
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(22px, 3.4vw, 36px);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(31, 92, 74, 0.4), rgba(6, 26, 21, 0.92));
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 44ch;
  font-family: var(--font-display);
  font-size: clamp(16px, 1.7vw, 20px);
  line-height: 1.7;
  color: var(--paper);
}

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

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(220px, 0.55fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: end;
  }

  .page-about .about-hero__meta {
    padding-top: 4px;
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-num-col) minmax(0, 1fr) var(--about-aside-col);
    gap: var(--about-chapter-gap);
    align-items: start;
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .page-about .about-chapter__num {
    font-size: clamp(48px, 5.4vw, 78px);
  }

  .page-about .about-chapter__cn {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.34em;
    font-size: 11px;
    line-height: 1;
  }

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

  .page-about .about-figure--right {
    float: right;
    width: 38%;
    max-width: 300px;
    margin: 6px 0 18px 28px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about .about-chapter__body {
    max-width: 62ch;
  }
}

@media (max-width: 520px) {
  .page-about .about-hero__meta dd {
    font-size: 22px;
  }

  .page-about .about-cta__actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}

页面已完成。