.page-about {
  --about-face-line: rgba(201, 162, 74, .28);
  --about-face-line-hover: rgba(201, 162, 74, .62);
  --about-face-bg: rgba(255, 255, 255, .025);
  --about-face-bg-hover: rgba(255, 255, 255, .055);
  --about-body-soft: rgba(247, 241, 228, .74);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(1.4rem, 3.6vw, 2.2rem);
  padding-bottom: clamp(2.4rem, 6vw, 4rem);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3.2rem);
  align-items: end;
}

.page-about .about-hero__title {
  margin: .5rem 0 1.1rem;
  font-size: clamp(2.6rem, 10vw, 5.6rem);
  line-height: .95;
  letter-spacing: -.035em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-hero__lede {
  max-width: 42ch;
  color: var(--muted);
  line-height: 1.85;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
}

.page-about .about-hero__actions {
  margin-top: 1.6rem;
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

/* ---------- 共用小节头 ---------- */

.page-about .about-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(1rem, 3vw, 1.8rem);
  margin-bottom: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-head__text {
  padding-top: .4rem;
}

.page-about .about-head .chapter-num {
  flex: 0 0 auto;
  line-height: 1;
}

/* ---------- 01 顺序 ---------- */

.page-about .about-order__intro {
  max-width: 62ch;
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-order__list {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(.9rem, 3vw, 2rem);
  padding: clamp(1.2rem, 3vw, 1.75rem) clamp(.4rem, 1vw, .9rem);
  border-bottom: 1px solid var(--line);
  transition: background-color .35s var(--ease);
}

.page-about .about-step:hover {
  background-color: rgba(201, 162, 74, .07);
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--gold-deep);
  padding-top: .4rem;
  min-width: 2.2rem;
}

.page-about .about-step__title {
  margin: 0 0 .5rem;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  letter-spacing: -.012em;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  line-height: 1.85;
}

/* ---------- 02 三种读法（深色） ---------- */

.page-about .about-audience {
  color: var(--cream);
}

.page-about .about-audience .kicker {
  color: var(--gold-soft);
}

.page-about .about-audience__title {
  color: var(--cream);
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .about-audience__figure {
  margin: 0 0 clamp(1.8rem, 5vw, 2.8rem);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-audience__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .9;
}

.page-about .about-audience__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.2rem, 3.5vw, 1.8rem);
}

.page-about .about-face {
  padding: clamp(1.2rem, 3vw, 1.6rem);
  border: 1px solid var(--about-face-line);
  background: var(--about-face-bg);
  border-radius: var(--radius);
  transition: border-color .35s var(--ease), background-color .35s var(--ease),
    transform .35s var(--ease);
}

.page-about .about-face:hover {
  border-color: var(--about-face-line-hover);
  background: var(--about-face-bg-hover);
  transform: translateY(-2px);
}

.page-about .about-face h3 {
  margin: .9rem 0 .55rem;
  font-size: clamp(1.08rem, 2.2vw, 1.28rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-face p {
  margin: 0;
  color: var(--about-body-soft);
  font-size: .95rem;
  line-height: 1.8;
}

/* ---------- 03 细节 ---------- */

.page-about .about-practice__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3rem);
  align-items: center;
}

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

.page-about .about-practice__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-about .about-practice__copy p {
  max-width: 58ch;
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 1.1rem;
}

.page-about .about-practice__copy .btn-row {
  margin-top: 1.6rem;
}

/* ---------- 收尾 ---------- */

.page-about .about-close__inner {
  text-align: left;
}

.page-about .about-close__title {
  margin: .9rem 0 1rem;
  font-size: clamp(1.7rem, 5vw, 2.7rem);
  letter-spacing: -.025em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-close__inner p {
  max-width: 52ch;
  margin: 0 0 1.5rem;
  color: var(--muted);
  line-height: 1.85;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-audience__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr .95fr;
  }

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

  .page-about .about-practice__grid {
    grid-template-columns: .88fr 1.12fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-face {
    transition: none;
  }
}