.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏档案头 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background: var(--refract);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 84% 14%, rgba(230, 59, 90, 0.20), transparent 46%),
    radial-gradient(circle at 8% 92%, rgba(217, 162, 75, 0.14), transparent 52%),
    radial-gradient(circle at 60% 60%, rgba(31, 138, 91, 0.08), transparent 58%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: end;
}

.page-about .page-head__index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 1rem;
}

.page-about .page-head__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.1rem, 6vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .page-head__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.1vw, 1.06rem);
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.9rem;
}

.page-about .about-hero__meta {
  border-top: 1px solid rgba(201, 206, 214, 0.24);
  padding-top: 1.1rem;
}

.page-about .about-hero__meta .data-list {
  display: grid;
  gap: 0;
}

.page-about .about-hero__meta .data-list__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.62rem 0;
  border-bottom: 1px dashed rgba(201, 206, 214, 0.18);
}

.page-about .about-hero__meta .data-list__key {
  font-size: 0.86rem;
  color: var(--graphite);
  letter-spacing: 0.02em;
}

.page-about .about-hero__meta .data-list__val {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--white);
}

.page-about .about-hero__meta .data-list__val--ruby {
  color: var(--ruby-soft);
}

.page-about .about-hero__meta .data-list__val--emerald {
  color: #5FD3A0;
}

/* ---------- 档案目录 ---------- */
.page-about .about-toc {
  margin-top: clamp(2rem, 5vw, 3.25rem);
  padding-top: 1.25rem;
  border-top: 1px solid rgba(201, 206, 214, 0.22);
}

.page-about .about-toc__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--graphite);
  margin-bottom: 0.85rem;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.15rem;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.6rem 0.55rem 0;
  color: rgba(244, 241, 234, 0.78);
  text-decoration: none;
  font-size: 0.92rem;
  border-bottom: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease, padding-left 0.25s ease;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--ruby);
  padding-left: 0.35rem;
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--amber);
  letter-spacing: 0.08em;
}

/* ---------- 章节框架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(2.75rem, 7vw, 5.5rem) 0;
  border-bottom: 1px solid rgba(201, 206, 214, 0.14);
}

.page-about .about-chapter--sea {
  background: linear-gradient(160deg, rgba(16, 42, 67, 0.55) 0%, rgba(11, 15, 20, 0) 72%);
}

.page-about .about-chapter--paper {
  background: linear-gradient(180deg, rgba(16, 42, 67, 0.42) 0%, rgba(42, 18, 48, 0.30) 100%);
}

.page-about .chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.page-about .chapter__rail {
  position: relative;
  padding-top: 0.25rem;
  border-top: 2px solid var(--ruby);
}

.page-about .chapter__num {
  margin: 0.85rem 0 0.5rem;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--amber);
  letter-spacing: -0.02em;
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
  letter-spacing: 0.01em;
}

.page-about .chapter__lede {
  margin: 0 0 1.15rem;
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
  line-height: 1.85;
  color: var(--paper);
}

.page-about .chapter__body p {
  margin: 0 0 1.1rem;
  max-width: 72ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.76);
}

.page-about .chapter__note {
  font-size: 0.9rem !important;
  color: rgba(244, 241, 234, 0.62) !important;
}

.page-about .chapter__note a {
  color: var(--ruby-soft);
}

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 1.75rem 0 0;
  background: rgba(18, 26, 35, 0.6);
  border: 1px solid rgba(201, 206, 214, 0.16);
}

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

.page-about .figure__caption {
  margin: 0;
  padding: 0.85rem 1rem 0.95rem;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--graphite);
  border-top: 1px solid rgba(201, 206, 214, 0.14);
}

/* ---------- 高亮块 ---------- */
.page-about .callout {
  margin-top: 1.5rem;
  border-left: 3px solid var(--amber);
}

.page-about .callout p {
  margin: 0 !important;
  font-size: 0.95rem !important;
  color: var(--paper) !important;
}

/* ---------- 用户场景卡 ---------- */
.page-about .audience-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .audience-card {
  position: relative;
  padding: 1.4rem 1.4rem 1.5rem;
  background: rgba(244, 241, 234, 0.05);
  border: 1px solid rgba(201, 206, 214, 0.18);
  border-top: 2px solid var(--sea);
  transition: border-color 0.28s ease, transform 0.28s ease, background 0.28s ease;
}

.page-about .audience-card:hover {
  border-top-color: var(--ruby);
  background: rgba(244, 241, 234, 0.08);
  transform: translateY(-3px);
}

.page-about .audience-card h3 {
  margin: 0.85rem 0 0.6rem;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .audience-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.72);
}

/* ---------- 团队卡 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.page-about .team-card {
  position: relative;
  padding: 1.3rem 1.15rem 1.35rem;
  background: var(--paper);
  color: var(--ink);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
  transition: background 0.3s ease, transform 0.3s ease;
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  background: var(--white);
  transform: translateY(-3px);
  outline: none;
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ruby);
  letter-spacing: -0.02em;
}

.page-about .team-card__role {
  margin: 0.5rem 0 0;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-card__note {
  margin: 0.7rem 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--graphite);
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.3s ease, margin-top 0.3s ease;
  max-height: 12rem;
  opacity: 1;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0 0 0 2rem;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0.42rem;
  top: 0.85rem;
  bottom: 0.85rem;
  width: 2px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--emerald) 55%, var(--ruby) 100%);
  opacity: 0.75;
}

.page-about .timeline__item {
  position: relative;
  margin-bottom: 0.7rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.72rem;
  top: 1.05rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--amber);
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.page-about .timeline__item:has(details[open])::before {
  background: var(--ruby);
  border-color: var(--ruby);
  transform: scale(1.25);
}

.page-about .timeline__node {
  border: 1px solid rgba(201, 206, 214, 0.18);
  background: rgba(18, 26, 35, 0.55);
  transition: border-color 0.28s ease, background 0.28s ease;
}

.page-about .timeline__node:hover {
  border-color: rgba(217, 162, 75, 0.6);
  background: rgba(18, 26, 35, 0.85);
}

.page-about .timeline__node[open] {
  border-color: rgba(230, 59, 90, 0.55);
  background: rgba(16, 42, 67, 0.6);
}

.page-about .timeline__node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.95rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline__node > summary:focus-visible {
  outline: 2px solid var(--ruby);
  outline-offset: 2px;
}

.page-about .timeline__phase {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .timeline__name {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .timeline__name::after {
  content: "＋";
  margin-left: 0.6rem;
  font-weight: 400;
  color: var(--graphite);
  font-size: 0.9rem;
}

.page-about .timeline__node[open] .timeline__name::after {
  content: "－";
  color: var(--ruby);
}

.page-about .timeline__body {
  padding: 0 1.1rem 1.05rem;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.74);
}

/* ---------- 服务数据表 ---------- */
.page-about .data-list--wide {
  margin-top: 1.5rem;
  border-top: 1px solid rgba(201, 206, 214, 0.2);
}

.page-about .data-list--wide .data-list__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(201, 206, 214, 0.14);
}

.page-about .data-list--wide .data-list__key {
  font-size: 0.88rem;
  color: var(--graphite);
}

.page-about .data-list--wide .data-list__val {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--white);
}

.page-about .data-list--wide .data-list__val--emerald {
  color: #5FD3A0;
}

/* ---------- 五步流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  counter-reset: flowstep;
}

.page-about .flow__step {
  position: relative;
  padding: 1.15rem 0 1.2rem 3.2rem;
  border-top: 1px solid rgba(201, 206, 214, 0.16);
}

.page-about .flow__step:last-child {
  border-bottom: 1px solid rgba(201, 206, 214, 0.16);
}

.page-about .flow__num {
  position: absolute;
  left: 0;
  top: 1.15rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .flow__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .flow__step p {
  margin: 0 !important;
  font-size: 0.9rem !important;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.7) !important;
}

/* ---------- 品牌引用块 ---------- */
.page-about .quote-block {
  margin-top: 2.25rem;
  padding: 1.6rem 1.4rem 1.5rem;
  background: linear-gradient(135deg, rgba(230, 59, 90, 0.14) 0%, rgba(16, 42, 67, 0.55) 100%);
  border-left: 3px solid var(--ruby);
}

.page-about .quote-block__text {
  margin: 0 0 0.85rem !important;
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 2vw, 1.28rem) !important;
  font-weight: 700;
  line-height: 1.7;
  color: var(--white) !important;
  max-width: 40ch;
}

.page-about .quote-block__sign {
  margin: 0 !important;
  font-family: var(--font-mono);
  font-size: 0.75rem !important;
  letter-spacing: 0.12em;
  color: var(--amber) !important;
}

/* ---------- 结尾链接 ---------- */
.page-about .closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  margin-top: 2rem;
  padding-top: 1.4rem;
  border-top: 1px solid rgba(201, 206, 214, 0.18);
}

.page-about .closing-links .link-arrow {
  font-size: 0.92rem;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(230, 59, 90, 0.5);
  padding-bottom: 2px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .closing-links .link-arrow:hover,
.page-about .closing-links .link-arrow:focus-visible {
  color: var(--ruby-soft);
  border-bottom-color: var(--ruby-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-toc__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 1.75rem;
  }

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

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 2.25rem;
  }

  .page-about .flow__step:last-child {
    border-bottom: 1px solid rgba(201, 206, 214, 0.16);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }

  .page-about .chapter {
    grid-template-columns: minmax(0, 0.32fr) minmax(0, 0.68fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .chapter__rail {
    position: sticky;
    top: 6.5rem;
    align-self: start;
  }

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

  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-card__note {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
  }

  .page-about .team-card:hover .team-card__note,
  .page-about .team-card:focus-within .team-card__note,
  .page-about .team-card:focus-visible .team-card__note {
    max-height: 12rem;
    opacity: 1;
    margin-top: 0.7rem;
  }

  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 1.25rem;
  }

  .page-about .flow__step {
    padding: 2.65rem 0 1.2rem 0;
    border-top: 1px solid rgba(201, 206, 214, 0.16);
    border-bottom: 1px solid rgba(201, 206, 214, 0.16);
  }

  .page-about .flow__num {
    top: 1.15rem;
    left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .audience-card,
  .page-about .team-card,
  .page-about .team-card__note,
  .page-about .timeline__item::before,
  .page-about .about-toc__list a {
    transition: none;
  }

  .page-about .audience-card:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}