.page-about {
  --about-teal: #0E3B3A;
  --about-wine: #7A2740;
  --about-gap: clamp(1.5rem, 3vw, 2.5rem);
  --about-card-bg: rgba(7, 11, 20, 0.48);
  background: var(--c-void);
  color: var(--c-text);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--c-line);
  background: var(--c-night);
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 11, 20, 0.3) 0%, rgba(7, 11, 20, 0.82) 58%, var(--c-void) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(2.5rem, 8vw, 5.5rem) clamp(2rem, 6vw, 4.5rem);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5.4vw, 3.25rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--c-text);
  margin: 0.6rem 0 1rem;
  max-width: 17em;
}

.page-about .about-hero__lede {
  max-width: 40em;
  color: var(--c-muted);
  line-height: 1.85;
  font-size: var(--fs-16);
  margin: 0;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.6rem;
  margin-top: 1.6rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--c-line);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  padding-block: clamp(2rem, 5vw, 4rem) clamp(3rem, 7vw, 6rem);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: start;
}

.page-about .about-rail__sticky {
  display: block;
}

.page-about .about-index {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0 0 0.4rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.4rem 0.8rem;
  white-space: nowrap;
  font-size: var(--fs-14);
  color: var(--c-muted);
  text-decoration: none;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__num {
  font-size: var(--fs-12);
  color: var(--c-cyan);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-text);
  border-color: var(--c-cyan);
  background: rgba(69, 224, 224, 0.08);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 24px);
  margin-bottom: var(--about-gap);
  padding: clamp(1.35rem, 4vw, 2.75rem);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
}

.page-about .about-chapter--teal {
  background:
    linear-gradient(158deg, rgba(14, 59, 58, 0.9) 0%, rgba(11, 18, 32, 0.94) 58%, rgba(7, 11, 20, 0.96) 100%);
  border-color: rgba(69, 224, 224, 0.22);
}

.page-about .about-chapter--wine {
  background:
    linear-gradient(158deg, rgba(122, 39, 64, 0.82) 0%, rgba(43, 22, 38, 0.92) 46%, rgba(7, 11, 20, 0.96) 100%);
  border-color: rgba(240, 178, 60, 0.22);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(0.7rem, 2.4vw, 1.6rem);
  padding-bottom: 0.9rem;
  margin-bottom: clamp(1rem, 2.6vw, 1.6rem);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-chapter__num {
  flex: none;
  font-size: clamp(2.2rem, 7vw, 4rem);
  line-height: 0.82;
  font-weight: 300;
  letter-spacing: -0.04em;
  color: rgba(69, 224, 224, 0.18);
  -webkit-text-stroke: 1px rgba(69, 224, 224, 0.62);
}

.page-about .about-chapter--wine .about-chapter__num {
  color: rgba(240, 178, 60, 0.16);
  -webkit-text-stroke: 1px rgba(240, 178, 60, 0.6);
}

.page-about .about-chapter__title {
  font-size: clamp(1.25rem, 3.4vw, 1.95rem);
  font-weight: 800;
  line-height: 1.3;
  margin: 0.3rem 0 0;
  color: var(--c-text);
}

.page-about .about-chapter__body p {
  max-width: 42em;
  margin: 0 0 0.9rem;
  color: var(--c-muted);
  line-height: 1.85;
  font-size: var(--fs-16);
}

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

.page-about .about-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(69, 224, 224, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-link:hover {
  color: var(--c-text);
  border-color: var(--c-text);
}

/* ---------- 数据条 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin-top: 1.4rem;
}

.page-about .about-stat {
  padding: 0.85rem 1rem;
  background: rgba(7, 11, 20, 0.55);
  border-left: 2px solid var(--c-cyan);
  border-radius: 0 10px 10px 0;
}

.page-about .about-chapter--wine .about-stat {
  border-left-color: var(--c-amber);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(1.35rem, 3.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-cyan);
}

.page-about .about-chapter--wine .about-stat__num {
  color: var(--c-amber);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--fs-12);
  color: var(--c-muted);
  letter-spacing: 0.03em;
}

/* ---------- 三组分工 ---------- */
.page-about .about-crews {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin: 1.4rem 0;
}

.page-about .about-crew {
  padding: 1rem 1.1rem;
  background: var(--about-card-bg);
  border: 1px solid var(--c-line);
  border-top: 2px solid var(--c-cyan);
  border-radius: 0 0 12px 12px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crew:hover {
  transform: translateY(-2px);
  border-color: rgba(69, 224, 224, 0.5);
}

.page-about .about-crew__name {
  margin: 0 0 0.5rem;
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--c-text);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------- 插图 ---------- */
.page-about .about-figure {
  margin: 1.4rem 0;
  border: 1px solid var(--c-line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--c-panel);
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0 0 0 1.4rem;
  border-left: 1px solid var(--c-line);
  display: grid;
  gap: 1.35rem;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.4rem - 5px);
  top: 0.55rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-amber);
  box-shadow: 0 0 0 3px rgba(240, 178, 60, 0.16);
}

.page-about .about-timeline__item:nth-child(even)::before {
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(69, 224, 224, 0.15);
}

.page-about .about-timeline__mark {
  margin: 0 0 0.3rem;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 折叠问答 ---------- */
.page-about .fold {
  margin-top: 1.3rem;
  display: grid;
  gap: 0.6rem;
}

.page-about .fold__item {
  border: 1px solid var(--c-line);
  border-radius: 10px;
  background: rgba(7, 11, 20, 0.5);
  overflow: hidden;
}

.page-about .fold__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 0.9rem 1rem;
  background: none;
  border: 0;
  text-align: left;
  font-family: var(--font-body);
  font-size: var(--fs-16);
  font-weight: 600;
  color: var(--c-text);
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.page-about .fold__trigger:hover {
  color: var(--c-cyan);
}

.page-about .fold__icon {
  flex: none;
  width: 12px;
  height: 12px;
  border-right: 1.5px solid var(--c-cyan);
  border-bottom: 1.5px solid var(--c-cyan);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}

.page-about .fold__trigger[aria-expanded="true"] .fold__icon {
  transform: rotate(-135deg);
}

.page-about .fold__panel {
  padding: 0 1rem 1rem;
}

.page-about .fold__panel p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.4rem, 4vw, 2.5rem);
  border: 1px solid rgba(69, 224, 224, 0.25);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(43, 35, 80, 0.85), rgba(11, 18, 32, 0.95));
}

.page-about .about-cta__title {
  margin: 0.35rem 0 0.7rem;
  font-size: clamp(1.2rem, 3.2vw, 1.6rem);
  font-weight: 800;
  line-height: 1.35;
  color: var(--c-text);
}

.page-about .about-cta__text p {
  max-width: 40em;
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-crews {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .page-about .about-rail__sticky {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-index {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    margin-top: 0.9rem;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-bottom: 1px solid var(--c-line);
    border-radius: 0;
    padding: 0.6rem 0;
    white-space: normal;
    background: none;
    font-size: var(--fs-14);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: none;
    color: var(--c-cyan);
    border-bottom-color: var(--c-cyan);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew,
  .page-about .fold__icon,
  .page-about .about-index__link,
  .page-about .about-link {
    transition: none;
  }

  .page-about .about-crew:hover {
    transform: none;
  }
}