.page-about {
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-crumb {
  padding: clamp(14px, 3vw, 24px) 0 clamp(10px, 2vw, 16px);
  font-family: var(--pt-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}

/* ---------- 首屏叙事面板 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: flex-end;
  min-height: 520px;
  overflow: hidden;
  border: 1px solid var(--pt-line);
  border-radius: var(--pt-radius);
  background: var(--pt-green-deep);
  box-shadow: var(--pt-shadow);
}

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

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

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(200deg, rgba(75, 30, 111, 0.88) 0%, rgba(7, 28, 24, 0.93) 52%, var(--pt-green-deep) 100%);
}

.page-about .about-hero__body {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: clamp(24px, 5vw, 56px);
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  max-width: 20em;
  font-family: var(--pt-sans);
  font-weight: 800;
  font-size: clamp(28px, 5.2vw, 50px);
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--pt-cream);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--pt-mist);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .about-fact {
  border-left: 2px solid var(--pt-gold-deep);
  padding-left: 12px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--pt-mono);
  font-size: clamp(19px, 2.6vw, 25px);
  color: var(--pt-gold);
  letter-spacing: 0.02em;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--pt-mist);
}

.page-about .about-index {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3.4vw, 30px) 0 0;
  padding: 0;
}

.page-about .about-index__link {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--pt-line-strong);
  border-radius: 999px;
  font-size: 14px;
  color: var(--pt-cream);
  text-decoration: none;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--pt-mint);
  color: var(--pt-mint);
  background: rgba(78, 240, 200, 0.08);
}

/* ---------- 通用章节 ---------- */
.page-about .about-block {
  margin-top: clamp(52px, 8vw, 96px);
  scroll-margin-top: 96px;
}

.page-about .about-sec-head {
  max-width: 60ch;
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-lede {
  margin: 14px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--pt-mist);
}

.page-about .about-figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
  border: 1px solid var(--pt-line);
  border-radius: var(--pt-radius);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(75, 30, 111, 0.4), rgba(12, 42, 36, 0.7));
}

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

.page-about .about-figure figcaption {
  padding: 12px 18px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--pt-slate);
  border-top: 1px solid var(--pt-line);
}

/* ---------- 时间线 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-stage {
  display: grid;
  gap: 12px;
}

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

.page-about .about-stage__num {
  font-family: var(--pt-mono);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--pt-gold);
}

.page-about .about-stage__year {
  font-family: var(--pt-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--pt-slate);
}

.page-about .about-stage__card {
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--pt-line);
  border-radius: var(--pt-radius-sm);
  background: linear-gradient(160deg, rgba(75, 30, 111, 0.44), rgba(12, 42, 36, 0.74));
  box-shadow: var(--pt-shadow);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-stage__card:hover,
.page-about .about-stage__card:focus-within {
  border-color: rgba(78, 240, 200, 0.45);
  box-shadow: 0 30px 62px -44px #000;
}

.page-about .about-stage__card h3 {
  margin: 0 0 10px;
  font-family: var(--pt-serif);
  font-weight: 600;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.35;
  color: var(--pt-cream);
}

.page-about .about-stage__card p {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.8;
  color: var(--pt-body);
}

.page-about .about-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-tags li {
  padding: 4px 11px;
  border: 1px solid var(--pt-line-strong);
  border-radius: 999px;
  font-family: var(--pt-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--pt-mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-role {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--pt-line);
  border-radius: var(--pt-radius-sm);
  background: linear-gradient(165deg, rgba(23, 11, 38, 0.92), rgba(12, 42, 36, 0.78));
  transition: border-color 0.3s ease;
}

.page-about .about-role:hover {
  border-color: rgba(78, 240, 200, 0.38);
}

.page-about .about-role__icon {
  display: inline-flex;
  color: var(--pt-mint);
  margin-bottom: 12px;
}

.page-about .about-role__title {
  margin: 0 0 10px;
  font-family: var(--pt-serif);
  font-weight: 600;
  font-size: 20px;
  color: var(--pt-cream);
}

.page-about .about-role__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--pt-body);
}

.page-about .about-role__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--pt-line);
  font-family: var(--pt-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--pt-gold);
}

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

/* ---------- 服务原则 ---------- */
.page-about .about-principles__head {
  max-width: 58ch;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-principle {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--pt-line);
}

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

.page-about .about-principle__key {
  font-family: var(--pt-sans);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 20px);
  letter-spacing: 0.02em;
  color: var(--pt-cream);
}

.page-about .about-principle__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--pt-mist);
}

/* ---------- 视觉理念 ---------- */
.page-about .about-visual {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-visual__text p:not(.pt-eyebrow) {
  margin: 14px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--pt-body);
  max-width: 56ch;
}

.page-about .about-visual__aside {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--pt-line-strong);
  border-radius: var(--pt-radius-sm);
  background: linear-gradient(170deg, rgba(75, 30, 111, 0.5), rgba(4, 17, 14, 0.85));
}

.page-about .about-visual__aside .pt-note__label {
  color: var(--pt-gold);
}

.page-about .about-swatches {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-swatch {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  grid-template-areas: "chip name" "chip use";
  gap: 2px 12px;
  align-items: center;
}

.page-about .about-swatch__chip {
  grid-area: chip;
  width: 14px;
  height: 34px;
  border-radius: 4px;
  border: 1px solid var(--pt-line-strong);
}

.page-about .about-swatch__chip--green { background: #071C18; }
.page-about .about-swatch__chip--purple { background: #4B1E6F; }
.page-about .about-swatch__chip--gold { background: #F2C66D; }
.page-about .about-swatch__chip--mint { background: #4EF0C8; }

.page-about .about-swatch__name {
  grid-area: name;
  font-size: 14px;
  color: var(--pt-cream);
}

.page-about .about-swatch__use {
  grid-area: use;
  font-family: var(--pt-mono);
  font-size: 12px;
  color: var(--pt-slate);
}

.page-about .about-aside-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--pt-line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--pt-mist);
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  margin-top: clamp(52px, 8vw, 96px);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--pt-line-strong);
  border-radius: var(--pt-radius);
  background: radial-gradient(120% 140% at 0% 0%, rgba(75, 30, 111, 0.55), rgba(7, 28, 24, 0.95) 62%);
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-family: var(--pt-serif);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 30px);
  color: var(--pt-cream);
}

.page-about .about-next__text {
  margin: 0 0 22px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--pt-mist);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stage {
    grid-template-columns: 118px minmax(0, 1fr);
    column-gap: 28px;
    align-items: start;
  }

  .page-about .about-stage__mark {
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding-top: 16px;
    background: var(--pt-green);
    position: sticky;
    top: 96px;
  }

  .page-about .about-stage__num {
    font-size: 26px;
  }

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

  .page-about .about-stages::before {
    content: "";
    position: absolute;
    left: 58px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(180deg, var(--pt-mint), var(--pt-mist) 45%, transparent);
    opacity: 0.5;
  }

  .page-about .about-principle {
    grid-template-columns: 216px minmax(0, 1fr);
    column-gap: 28px;
    align-items: baseline;
  }
}

@media (min-width: 820px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    min-height: 600px;
  }

  .page-about .about-visual {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-about .about-visual__aside {
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-stage:nth-child(even) .about-stage__card {
    margin-inline-start: 7%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage__card,
  .page-about .about-role,
  .page-about .about-index__link {
    transition: none;
  }
}
<<<END>>>