.page-about {
  --about-gap: clamp(30px, 5vw, 64px);
  background: var(--paper);
  color: var(--ink-900);
  font-family: var(--font-body);
  padding-top: clamp(8px, 2vw, 16px);
  padding-bottom: clamp(48px, 8vw, 88px);
  overflow-wrap: break-word;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  margin-top: clamp(16px, 3vw, 28px);
  padding: clamp(24px, 4.6vw, 56px);
  border: 1px solid rgba(55, 226, 194, 0.24);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(55, 226, 194, 0.09), rgba(55, 226, 194, 0) 52%),
    var(--ink-900);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    repeating-linear-gradient(to right, rgba(55, 226, 194, 0.11) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(to bottom, rgba(55, 226, 194, 0.09) 0 1px, transparent 1px 72px);
}

.page-about .about-cover > * {
  position: relative;
  z-index: 1;
}

.page-about .about-cover__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-cover h1 {
  margin: clamp(14px, 2vw, 22px) 0 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 6.4vw, 78px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-cover__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: rgba(244, 246, 243, 0.84);
}

.page-about .about-cover__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cover-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid rgba(55, 226, 194, 0.32);
  border-radius: var(--radius);
  background: rgba(55, 226, 194, 0.07);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mint);
}

.page-about .cover-chip::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--neon);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(216, 225, 226, 0.18);
}

.page-about .about-facts dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(244, 246, 243, 0.6);
}

.page-about .about-facts dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.1;
  color: var(--neon);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: var(--about-gap);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding-top: clamp(24px, 3.5vw, 38px);
  border-top: var(--hair-ink);
}

.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(30px, 5vw, 58px);
}

.page-about .about-chapter__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--fog);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--graphite);
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-chapter:hover .about-chapter__no,
.page-about .about-chapter:focus-within .about-chapter__no {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--neon);
}

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

.page-about .about-chapter__body h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.3vw, 33px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.005em;
  color: var(--ink-900);
}

.page-about .about-chapter__body > p {
  margin: 14px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-800);
}

.page-about .chapter-note {
  margin: 18px 0 0;
  padding: 2px 0 2px 14px;
  max-width: 64ch;
  border-left: 2px solid var(--neon);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-800);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid var(--fog);
  border-radius: var(--radius);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: grayscale(0.55) contrast(1.04);
}

.page-about .about-figure figcaption {
  padding: 9px 14px;
  border-top: 1px solid var(--fog);
  background: #fff;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--graphite);
}

/* ---------- 三层资料清单 ---------- */
.page-about .layer-list {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  border: 1px solid var(--fog);
  border-radius: var(--radius);
  background: var(--fog);
  overflow: hidden;
}

.page-about .layer-list > li {
  background: #fff;
  padding: 18px clamp(16px, 2.6vw, 24px);
  transition: background 0.2s var(--ease);
}

.page-about .layer-list > li:hover {
  background: var(--mint);
}

.page-about .layer-list__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .layer-list__text {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink-800);
}

.page-about .layer-list__meta {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-700);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .team-card {
  padding: 16px 18px 18px;
  border: 1px solid var(--fog);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 1px 0 rgba(8, 24, 38, 0.05);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .team-card:hover {
  border-color: rgba(31, 79, 102, 0.42);
  box-shadow: 0 2px 6px rgba(8, 24, 38, 0.07);
}

.page-about .team-card__head {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .team-card__trigger {
  display: flex;
  align-items: baseline;
  gap: 10px;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-900);
  text-align: left;
  cursor: pointer;
}

.page-about .team-card__trigger:focus-visible {
  outline: 2px solid var(--focus-dark);
  outline-offset: 4px;
}

.page-about .team-card__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--track);
}

.page-about .team-card__panel p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-800);
}

/* ---------- 横向步骤条 ---------- */
.page-about .proof-steps {
  list-style: none;
  display: grid;
  gap: 16px;
  margin: 24px 0 0;
  padding: 22px 20px;
  border: 1px solid rgba(55, 226, 194, 0.18);
  border-radius: var(--radius);
  background: var(--ink-900);
}

.page-about .proof-steps__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--neon);
}

.page-about .proof-steps p {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 246, 243, 0.82);
}

/* ---------- 服务 ---------- */
.page-about .service-grid {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .service-card {
  padding: 18px 20px;
  border: 1px solid var(--fog);
  border-left: 3px solid var(--ink-700);
  border-radius: var(--radius);
  background: #fff;
}

.page-about .service-card__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .service-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-800);
}

.page-about .service-card p + p {
  margin-top: 10px;
}

/* ---------- 合作 ---------- */
.page-about .partner-row {
  display: grid;
  gap: 1px;
  margin-top: 22px;
  border: 1px solid var(--fog);
  border-radius: var(--radius);
  background: var(--fog);
  overflow: hidden;
}

.page-about .partner-item {
  padding: 18px 20px;
  background: #fff;
}

.page-about .partner-item__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1;
  color: var(--ink-900);
}

.page-about .partner-item__label {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-800);
}

.page-about .partner-item__text {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .chapter-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
  padding: 18px 20px;
  border: 1px solid rgba(55, 226, 194, 0.22);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .chapter-cta p {
  flex: 1 1 220px;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 246, 243, 0.86);
}

/* ---------- 第二栏 ---------- */
.page-about .about-aside {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .aside-card {
  padding: 20px;
  border: 1px solid var(--fog);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 1px 0 rgba(8, 24, 38, 0.05);
}

.page-about .aside-card__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--track);
}

.page-about .aside-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .aside-card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-about .aside-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .aside-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  border-top: 1px dashed var(--fog);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-800);
}

.page-about .aside-list li::before {
  content: "—";
  font-family: var(--font-mono);
  color: var(--graphite);
}

.page-about .aside-links {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .aside-links li + li {
  border-top: 1px solid var(--fog);
}

.page-about .aside-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 0;
  font-size: 14.5px;
  color: var(--ink-800);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .aside-links a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--graphite);
  transition: transform 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .aside-links a:hover {
  color: var(--ink-900);
}

.page-about .aside-links a:hover::after {
  color: var(--focus-dark);
  transform: translateX(3px);
}

.page-about .aside-links a:focus-visible {
  outline: 2px solid var(--focus-dark);
  outline-offset: 2px;
}

.page-about .aside-card .btn {
  display: flex;
  justify-content: center;
  width: 100%;
  margin-top: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 760px) {
  .page-about .about-chapter {
    grid-template-columns: 64px minmax(0, 1fr);
    column-gap: 28px;
    align-items: start;
  }

  .page-about .about-chapter__no {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-chapter__body {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .proof-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    padding: 24px 8px;
  }

  .page-about .proof-steps > li {
    padding: 0 18px;
  }

  .page-about .proof-steps > li + li {
    border-left: 1px solid rgba(216, 225, 226, 0.16);
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 330px);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-chapter__no,
  .page-about .team-card,
  .page-about .aside-links a,
  .page-about .aside-links a::after,
  .page-about .layer-list > li {
    transition: none;
  }
}