.page-about {
  background: var(--kok-fog);
  color: var(--kok-gray);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  max-width: var(--container);
  margin-inline: auto;
  padding: 1.1rem clamp(1.25rem, 4vw, 4rem) 0;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-serif);
  line-height: 1.2;
}

.page-about h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 900;
  margin: 0.35rem 0 1rem;
  letter-spacing: 0.02em;
}

.page-about h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  color: var(--kok-navy);
  margin: 0 0 1rem;
  padding-bottom: 0.75rem;
  position: relative;
}

.page-about h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 4px;
  background: var(--kok-gold);
}

.page-about h3 {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  color: var(--kok-navy);
  margin: 0 0 0.5rem;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--kok-red);
  margin: 0 0 0.6rem;
}

.page-about .about-kicker--light {
  color: var(--kok-gold);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(132deg, #0B1B3A 0%, #102A55 62%, #16356b 100%);
  color: var(--kok-fog);
  padding: clamp(3.5rem, 8vw, 6rem) clamp(1.25rem, 4vw, 4rem);
  margin-top: 1.5rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -80px;
  width: 320px;
  height: 320px;
  border: 3px solid rgba(201, 169, 110, 0.35);
  transform: rotate(22deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 6px;
  background: repeating-linear-gradient(90deg, #C9A96E 0 14px, transparent 14px 30px);
}

.page-about .about-hero__angle {
  position: absolute;
  top: 18%;
  right: -12%;
  width: 220px;
  height: 220px;
  background: rgba(201, 169, 110, 0.1);
  transform: rotate(42deg);
  border: 2px solid rgba(201, 169, 110, 0.28);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.2rem;
  max-width: var(--container);
  margin-inline: auto;
}

.page-about .about-hero__lead {
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  max-width: 34em;
  color: rgba(245, 242, 235, 0.88);
  line-height: 1.65;
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.6rem;
}

.page-about .about-hero .btn--primary {
  background: var(--kok-gold);
  border-color: var(--kok-gold);
  color: var(--kok-navy);
}

.page-about .about-hero .btn--ghost {
  border-color: var(--kok-gold);
  color: var(--kok-gold);
}

.page-about .about-hero__right {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
}

.page-about .about-hero__stat {
  border: var(--border-w) solid var(--kok-gold);
  background: rgba(201, 169, 110, 0.08);
  padding: 1.15rem 1.2rem;
  box-shadow: 8px 8px 0 rgba(201, 169, 110, 0.16);
}

.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 700;
  color: var(--kok-gold);
  line-height: 1.1;
  margin-bottom: 0.25rem;
}

.page-about .about-hero__stat-label {
  font-size: 0.85rem;
  color: rgba(245, 242, 235, 0.72);
}

/* ---------- 团队区 ---------- */
.page-about .about-team,
.page-about .about-split,
.page-about .about-experts,
.page-about .about-legacy {
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(3.5rem, 7vw, 5.5rem) clamp(1.25rem, 4vw, 4rem);
}

.page-about .about-team__grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-team__intro p {
  margin-bottom: 1rem;
  max-width: 42em;
}

.page-about .about-trust {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-trust__item {
  position: relative;
  border: var(--border-w) solid var(--kok-navy);
  background: #fff;
  padding: 1.5rem;
  box-shadow: var(--shadow-navy);
}

.page-about .about-trust__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--kok-red);
  margin-bottom: 0.5rem;
  letter-spacing: 0.12em;
}

/* ---------- 左右分屏：时间线 + 信息架构 ---------- */
.page-about .about-split__layout {
  display: grid;
  gap: 3.2rem;
}

.page-about .about-timeline__img,
.page-about .about-arch__img {
  display: block;
  width: 100%;
  border: var(--border-w) solid var(--kok-navy);
  box-shadow: var(--shadow-hard);
  margin: 1.5rem 0 1rem;
}

.page-about .about-timeline {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 6px;
  width: 3px;
  background: var(--kok-gold);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 1.75rem 2.5rem;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -1px;
  top: 0.3rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--kok-gold);
  border: 3px solid var(--kok-navy);
  box-shadow: 0 0 0 3px var(--kok-fog);
}

.page-about .about-timeline__content h3 {
  color: var(--kok-navy);
}

.page-about .about-timeline__content p {
  margin: 0.25rem 0 0;
  font-size: 0.95rem;
  max-width: 34em;
}

.page-about .about-arch__lead {
  max-width: 46em;
  margin-bottom: 0.5rem;
}

.page-about .about-arch__tree {
  margin: 1.25rem 0 1.5rem;
  overflow-x: auto;
  border: var(--border-w) solid var(--kok-navy);
  background: #fff;
  padding: 1rem 0.75rem;
  box-shadow: var(--shadow-navy);
}

.page-about .arch-svg {
  min-width: 520px;
  width: 100%;
  height: auto;
  display: block;
}

.page-about .arch-svg text {
  font-family: var(--font-sans);
}

.page-about .about-arch__tree figcaption {
  font-size: 0.82rem;
  color: var(--kok-gray);
  padding: 0.75rem 0.5rem 0;
  text-align: center;
}

.page-about .arch-details__item {
  border: var(--border-w) solid var(--kok-navy);
  background: #fff;
  margin-bottom: 0.85rem;
  box-shadow: var(--shadow-navy);
}

.page-about .arch-details__item summary {
  cursor: pointer;
  padding: 1rem 1.25rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1rem;
  color: var(--kok-navy);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.page-about .arch-details__item summary::-webkit-details-marker {
  display: none;
}

.page-about .arch-details__item summary::after {
  content: "＋";
  color: var(--kok-red);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1;
}

.page-about .arch-details__item[open] summary {
  border-bottom: 2px solid var(--kok-gold);
}

.page-about .arch-details__item[open] summary::after {
  content: "－";
}

.page-about .arch-details__item p {
  margin: 0;
  padding: 1rem 1.25rem 1.25rem;
  font-size: 0.95rem;
}

/* ---------- 数据存档 ---------- */
.page-about .about-archive {
  background: var(--kok-navy);
  padding: clamp(3.5rem, 7vw, 5.5rem) 0;
}

.page-about .about-archive__grid {
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 clamp(1.25rem, 4vw, 4rem);
  display: grid;
  gap: 2.5rem;
  color: var(--kok-fog);
}

.page-about .about-archive h2,
.page-about .about-legacy h2 {
  color: var(--kok-fog);
}

.page-about .about-archive__intro p {
  opacity: 0.88;
  max-width: 42em;
}

.page-about .about-archive__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .about-stat {
  border: 2px solid rgba(201, 169, 110, 0.55);
  background: rgba(255, 255, 255, 0.04);
  padding: 1.15rem 1.25rem;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  font-weight: 700;
  color: var(--kok-gold);
  line-height: 1.1;
}

.page-about .about-stat__label {
  font-size: 0.85rem;
  opacity: 0.8;
  display: block;
  margin-top: 0.25rem;
}

.page-about .about-archive__features {
  max-width: var(--container);
  margin-inline: auto;
  padding: 2rem clamp(1.25rem, 4vw, 4rem) 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-archive__feature {
  border: var(--border-w) solid var(--kok-light);
  background: rgba(255, 255, 255, 0.06);
  padding: 1.5rem;
}

.page-about .about-archive__feature h3 {
  color: var(--kok-fog);
}

.page-about .about-archive__feature p {
  margin: 0;
  font-size: 0.95rem;
  opacity: 0.82;
}

/* ---------- 专家专栏 ---------- */
.page-about .about-experts__head {
  max-width: 46em;
}

.page-about .about-experts__head p:not(.about-kicker) {
  margin-bottom: 1.4rem;
}

.page-about .about-experts__grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about .about-experts__card {
  border: var(--border-w) solid var(--kok-navy);
  border-top: 6px solid var(--kok-gold);
  background: #fff;
  padding: 1.5rem;
  box-shadow: var(--shadow-navy);
}

.page-about .about-experts__card p {
  margin: 0.75rem 0 0;
  font-size: 0.95rem;
}

.page-about .about-experts__card .tag {
  display: inline-block;
  margin-bottom: 0.85rem;
}

/* ---------- 旧版入口承诺 ---------- */
.page-about .about-legacy__content {
  position: relative;
  background: var(--kok-navy);
  color: var(--kok-fog);
  padding: clamp(2.4rem, 5vw, 3.6rem);
  box-shadow: var(--shadow-hard);
  border: 3px solid var(--kok-navy);
}

.page-about .about-legacy__content > p:not(.about-kicker) {
  max-width: 46em;
  opacity: 0.9;
}

.page-about .about-legacy__promises {
  list-style: none;
  margin: 1.6rem 0;
  padding: 0;
}

.page-about .about-legacy__promises li {
  position: relative;
  padding-left: 1.8rem;
  margin-bottom: 0.8rem;
  font-family: var(--font-serif);
  font-weight: 600;
}

.page-about .about-legacy__promises li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--kok-gold);
  font-weight: 700;
}

.page-about .about-legacy__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.page-about .about-legacy .btn--ghost {
  border-color: var(--kok-gold);
  color: var(--kok-gold);
}

.page-about .about-legacy__banner {
  margin: 1.5rem 0 0;
  border: var(--border-w) solid var(--kok-navy);
  background: var(--kok-navy);
}

.page-about .about-legacy__banner img {
  display: block;
  width: 100%;
  object-fit: cover;
}

.page-about .about-legacy__banner figcaption {
  background: var(--kok-gold);
  color: var(--kok-navy);
  padding: 0.9rem 1.25rem;
  font-family: var(--font-serif);
  font-weight: 700;
  text-align: center;
}

/* ---------- 桌面端增强 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.35fr 1fr;
    align-items: end;
    gap: 3rem;
  }

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

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

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

@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
    gap: 3.5rem;
  }

  .page-about .about-archive__grid {
    grid-template-columns: 1fr 1.1fr;
    align-items: center;
    gap: 3.5rem;
  }

  .page-about .about-legacy__content {
    padding: clamp(2.8rem, 6vw, 4.2rem);
  }
}

@media (min-width: 1080px) {
  .page-about .about-split__layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 4.5rem;
  }

  .page-about .about-legacy__content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: end;
  }

  .page-about .about-legacy__promises {
    margin: 1.6rem 0 0;
  }

  .page-about .about-legacy__links {
    justify-content: flex-end;
  }
}

/* ---------- 动效与减弱运动 ---------- */
.page-about .about-timeline__item,
.page-about .about-stat,
.page-about .about-archive__feature,
.page-about .about-experts__card,
.page-about .about-trust__item,
.page-about .arch-details__item {
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-trust__item:hover,
.page-about .about-archive__feature:hover,
.page-about .about-experts__card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-hard);
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}