.page-about {
  --about-num-size: clamp(2.8rem, 6.4vw, 4.8rem);
  --about-chapter-gap: clamp(36px, 5vw, 64px);
  --about-line: rgba(232, 237, 242, 0.14);
  background: var(--ink);
  color: var(--mist);
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: 6px;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(36px, 5.5vw, 72px);
  border-bottom: 1px solid var(--about-line);
  background:
    radial-gradient(120% 100% at 84% 0%, rgba(56, 242, 232, 0.10), transparent 58%),
    radial-gradient(90% 90% at 0% 100%, rgba(26, 15, 46, 0.85), transparent 62%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(112deg, rgba(26, 15, 46, 0.94) 0 38%, rgba(26, 15, 46, 0) 38.2%),
    linear-gradient(112deg, rgba(91, 113, 134, 0.18) 0 64%, rgba(91, 113, 134, 0) 64.2%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero-copy .eyebrow {
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-hero-title {
  font-family: var(--font-body);
  font-size: clamp(1.75rem, 4.2vw, 3.2rem);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -0.005em;
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  max-width: 20em;
  color: var(--mist);
}

.page-about .about-hero-copy .lede {
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.86;
  color: var(--mist-70);
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 40em;
}

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

.page-about .about-hero-media {
  margin: 0;
  align-self: end;
  border: 2px solid var(--hair-strong);
  box-shadow: var(--hard-shadow);
}

.page-about .about-hero-media img,
.page-about .about-flow-media img,
.page-about .about-team-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* 主体网格 */
.page-about .about-body {
  padding-top: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
  align-items: start;
}

/* 左侧索引 */
.page-about .about-index {
  align-self: start;
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--panel-blue);
  background: var(--graphite);
  padding: clamp(16px, 2vw, 22px);
}

.page-about .about-index .eyebrow {
  letter-spacing: 0.2em;
  color: var(--lavender);
  margin: 0 0 14px;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 6px;
  text-decoration: none;
  color: var(--mist-70);
  border-left: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index-link .mono {
  color: var(--lavender);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(56, 242, 232, 0.06);
}

.page-about .about-index-foot {
  display: grid;
  gap: 2px;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-index-num {
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  line-height: 1;
  color: var(--cyan);
  text-shadow: 0 0 18px rgba(56, 242, 232, 0.32);
}

.page-about .about-index-cap {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist-55);
}

/* 右窄注释列 */
.page-about .about-notes {
  display: none;
}

/* 章节 */
.page-about .about-chapter {
  padding-top: var(--about-chapter-gap);
  border-top: 1px solid var(--about-line);
}

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

.page-about .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(14px, 2vw, 22px);
  row-gap: 4px;
  align-items: start;
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .section-num {
  grid-row: 1 / span 3;
  font-family: var(--font-mono);
  font-size: var(--about-num-size);
  line-height: 0.82;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px var(--lavender);
  opacity: 0.72;
}

.page-about .section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  opacity: 0.85;
  margin: 0;
}

.page-about .section-title {
  font-family: var(--font-body);
  font-size: clamp(1.3rem, 2.4vw, 1.85rem);
  line-height: 1.28;
  font-weight: 700;
  margin: 0;
  color: var(--mist);
}

.page-about .section-rule {
  grid-column: 1 / -1;
  height: 1px;
  margin-top: 10px;
  background: linear-gradient(90deg, var(--hair-strong), transparent);
}

/* 正文 */
.page-about .about-lead {
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.86;
  color: var(--mist-70);
  border-left: 3px solid var(--gold);
  padding-left: clamp(14px, 2vw, 20px);
  margin: 0 0 clamp(16px, 2vw, 22px);
}

.page-about .about-prose p {
  margin: 0 0 14px;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist-70);
}

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

.page-about .about-prose--after {
  margin-top: clamp(18px, 2.4vw, 26px);
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 1px dashed var(--about-line);
}

/* 拉页注释 */
.page-about .about-callout {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: clamp(16px, 2vw, 22px);
  background: var(--archive);
  border: 1px solid var(--hair-strong);
  border-left: 4px solid var(--orange);
  box-shadow: var(--hard-shadow);
}

.page-about .about-callout p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist-70);
}

.page-about .about-callout .about-callout-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 8px;
}

/* 流程配图 */
.page-about .about-flow-media {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  border: 2px solid var(--hair-strong);
  background: var(--graphite);
}

.page-about .about-flow-media .media-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist-55);
  padding: 10px 12px;
  border-top: 1px solid var(--about-line);
}

/* 四步 */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--hair-strong);
}

.page-about .about-step {
  position: relative;
  background: var(--graphite);
  padding: clamp(16px, 2vw, 24px);
  display: grid;
  gap: 8px;
  align-content: start;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-step::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur) var(--ease);
}

.page-about .about-step:hover {
  transform: translate(-2px, -2px);
  background: var(--archive);
}

.page-about .about-step:hover::after {
  transform: scaleY(1);
}

.page-about .about-step-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-step-title {
  font-family: var(--font-body);
  font-size: 1.02rem;
  font-weight: 700;
  margin: 0;
  color: var(--mist);
}

.page-about .about-step-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--mist-55);
}

/* 六类资料 */
.page-about .about-cats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--hair-strong);
}

.page-about .about-cat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(12px, 1.6vw, 18px);
  row-gap: 6px;
  align-items: baseline;
  background: var(--graphite);
  border-left: 3px solid var(--panel-blue);
  padding: clamp(14px, 1.8vw, 20px);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-cat:nth-child(2) { border-left-color: rgba(91, 113, 134, 0.85); }
.page-about .about-cat:nth-child(3) { border-left-color: rgba(91, 113, 134, 0.7); }
.page-about .about-cat:nth-child(4) { border-left-color: rgba(91, 113, 134, 0.58); }
.page-about .about-cat:nth-child(5) { border-left-color: rgba(91, 113, 134, 0.46); }
.page-about .about-cat:nth-child(6) { border-left-color: var(--gold); }

.page-about .about-cat:hover {
  background: var(--archive);
}

.page-about .about-cat-idx {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lavender);
}

.page-about .about-cat-name {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  margin: 0;
  color: var(--mist);
}

.page-about .about-cat-text {
  grid-column: 2;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--mist-55);
}

/* 数据条 */
.page-about .about-stats {
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--hair-strong);
}

.page-about .about-stat {
  background: var(--graphite);
  padding: clamp(14px, 2vw, 20px);
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  line-height: 1;
  color: var(--cyan);
  text-shadow: 0 0 18px rgba(56, 242, 232, 0.3);
}

.page-about .about-stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist-55);
}

/* 团队 */
.page-about .about-team-media {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  border: 2px solid var(--hair-strong);
  background: var(--graphite);
}

.page-about .about-team-media .media-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist-55);
  padding: 10px 12px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .about-role {
  border: 1px solid var(--hair-strong);
  border-top: 3px solid var(--panel-blue);
  background: var(--graphite);
  padding: clamp(14px, 1.8vw, 20px);
  transition: transform var(--dur) var(--ease), border-top-color var(--dur) var(--ease);
}

.page-about .about-role:hover {
  transform: translate(-2px, -2px);
  border-top-color: var(--cyan);
}

.page-about .about-role-name {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--mist);
}

.page-about .about-role-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--mist-55);
}

/* 原则卡片 */
.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-principle {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--archive);
  border: 2px solid var(--hair-strong);
  box-shadow: var(--hard-shadow);
  overflow: hidden;
}

.page-about .about-principle::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 22px;
  height: 22px;
  background: linear-gradient(225deg, var(--gold) 0 50%, transparent 50%);
  opacity: 0.75;
}

.page-about .about-principle-idx {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-principle-name {
  font-family: var(--font-body);
  font-size: 1.08rem;
  font-weight: 700;
  margin: 10px 0 8px;
  color: var(--mist);
}

.page-about .about-principle-text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist-70);
}

/* 收尾 */
.page-about .about-cta {
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  background:
    radial-gradient(90% 120% at 10% 0%, rgba(56, 242, 232, 0.08), transparent 60%),
    var(--archive);
  padding: clamp(32px, 5vw, 64px) 0;
}

.page-about .about-cta-inner {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: center;
}

.page-about .about-cta-copy .eyebrow {
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin: 0 0 12px;
}

.page-about .about-cta-title {
  font-family: var(--font-body);
  font-size: clamp(1.35rem, 2.6vw, 2.05rem);
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--mist);
}

.page-about .about-cta-text {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--mist-70);
  max-width: 40em;
}

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

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

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

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

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 1080px) {
  .page-about .about-grid {
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr) minmax(64px, 104px);
    gap: clamp(24px, 3vw, 44px);
  }

  .page-about .about-index {
    position: sticky;
    top: var(--sticky-top);
  }

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

  .page-about .about-notes {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 22px;
    padding: 8px 0 0 10px;
    border-left: 1px solid var(--about-line);
    min-height: 320px;
  }

  .page-about .about-note-line {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--lavender);
    opacity: 0.7;
  }
}

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

  .page-about .about-step:hover,
  .page-about .about-role:hover {
    transform: none;
  }
}