.page-about {
  --about-shadow-hard: 8px 8px 0 rgba(212, 175, 55, 0.16);
  --about-violet-glow: radial-gradient(closest-side, rgba(109, 40, 217, 0.26), transparent);
  background: var(--navy-950);
  color: var(--white);
  overflow-x: clip;
}

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

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--gold-400);
}

/* 首屏 */
.about-hero {
  position: relative;
  padding: 32px 0 56px;
  overflow: hidden;
}

.about-hero::before {
  content: "2016";
  position: absolute;
  top: 0;
  right: -30px;
  font-family: var(--font-heading);
  font-size: clamp(90px, 18vw, 210px);
  line-height: 1;
  color: rgba(212, 175, 55, 0.05);
  pointer-events: none;
  z-index: 0;
}

.about-hero::after {
  content: "";
  position: absolute;
  top: -100px;
  right: -60px;
  width: 480px;
  height: 480px;
  background: var(--about-violet-glow);
  pointer-events: none;
  z-index: 0;
}

.about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.about-hero__kicker {
  color: var(--gold-400);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  line-height: 1.16;
  margin-bottom: 22px;
}

.about-hero h1::after {
  content: "";
  display: block;
  width: 70px;
  height: 3px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--gold-400), rgba(212, 175, 55, 0.1));
}

.about-hero__lead {
  color: var(--slate-300);
  font-size: 1.08rem;
  line-height: 1.8;
  max-width: 640px;
  margin-bottom: 20px;
}

.about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.about-hero__figure {
  position: relative;
  margin: 0;
}

.about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 16px -14px -14px 16px;
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 14px;
  z-index: -1;
}

.about-hero__figure img {
  width: 100%;
  height: auto;
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 14px;
  box-shadow: var(--shadow-float);
  object-fit: cover;
}

/* 章节标题 */
.page-about .section__header {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.page-about .section__number {
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 6vw, 4rem);
  line-height: 1;
  color: var(--gold-400);
}

.page-about .section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1.25;
  margin: 0;
}

/* 01 品牌缘起 */
.about-origin {
  padding: 56px 0;
  position: relative;
}

.about-origin__grid {
  display: grid;
  gap: 32px;
}

.about-origin__content p {
  color: var(--slate-300);
  line-height: 1.85;
  margin-bottom: 16px;
}

.about-origin__content blockquote {
  margin: 28px 0 0;
  padding-left: 20px;
  border-left: 3px solid var(--gold-400);
  font-family: var(--font-heading);
  font-size: 1.35rem;
  line-height: 1.6;
  color: var(--gold-300);
}

.about-origin__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.about-origin__fact {
  background: var(--navy-900);
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  box-shadow: var(--about-shadow-hard);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.about-origin__num {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  line-height: 1;
  color: var(--gold-400);
}

.about-origin__label {
  color: var(--slate-300);
  font-size: 0.85rem;
  line-height: 1.4;
}

/* 02 时间轴 */
.about-timeline {
  padding: 64px 0;
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.06), rgba(109, 40, 217, 0.12) 50%, rgba(139, 92, 246, 0.06));
}

.about-timeline__heading .about-timeline__intro {
  color: var(--slate-300);
  line-height: 1.75;
  margin: 12px 0 0;
  max-width: 680px;
}

.about-timeline__rail {
  position: relative;
  max-width: 880px;
  margin-top: 36px;
}

.about-timeline__rail::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold-400), rgba(212, 175, 55, 0.08));
}

.about-timeline__item {
  position: relative;
  margin: 0 0 18px 52px;
  background: var(--navy-900);
  border: 1px solid rgba(212, 175, 55, 0.28);
  border-left: 4px solid var(--gold-400);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.about-timeline__item::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold-400);
  box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.14);
}

.about-timeline__item--v2 {
  border-left-color: var(--violet-500);
}

.about-timeline__item--v2::before {
  background: var(--violet-500);
  box-shadow: 0 0 0 5px rgba(139, 92, 246, 0.14);
}

.about-timeline__item--v3 {
  border-left-color: var(--gold-300);
}

.about-timeline__item--v3::before {
  background: var(--gold-300);
  box-shadow: 0 0 0 5px rgba(235, 203, 107, 0.14);
}

.about-timeline__item--v4 {
  border-left-color: var(--violet-700);
}

.about-timeline__item--v4::before {
  background: var(--violet-700);
  box-shadow: 0 0 0 5px rgba(109, 40, 217, 0.14);
}

.about-timeline__item--v5 {
  border-left-color: var(--gold-400);
}

.about-timeline__item--v5::before {
  background: var(--gold-400);
  box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.14);
}

.about-timeline__item--v6 {
  border-left-color: var(--gold-300);
}

.about-timeline__item--v6::before {
  background: var(--gold-300);
  box-shadow: 0 0 0 5px rgba(235, 203, 107, 0.14);
}

.about-timeline__summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  cursor: pointer;
}

.about-timeline__summary::-webkit-details-marker {
  display: none;
}

.about-timeline__summary:hover .about-timeline__version,
.about-timeline__summary:focus-visible .about-timeline__version {
  background: var(--gold-400);
  color: var(--navy-950);
}

.about-timeline__item[open] .about-timeline__summary {
  border-bottom: 1px solid rgba(212, 175, 55, 0.14);
}

.about-timeline__version {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--gold-400);
  background: rgba(212, 175, 55, 0.1);
  border-radius: 8px;
  padding: 8px 10px;
  min-width: 54px;
  text-align: center;
  transition: background var(--transition), color var(--transition);
}

.about-timeline__title-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.about-timeline__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--white);
  line-height: 1.3;
}

.about-timeline__year {
  font-size: 0.82rem;
  color: var(--slate-300);
}

.about-timeline__arrow {
  margin-left: auto;
  color: var(--gold-400);
  font-size: 1.5rem;
  line-height: 1;
}

.about-timeline__arrow::before {
  content: "\002B";
}

.about-timeline__item[open] .about-timeline__arrow::before {
  content: "\2212";
}

.about-timeline__detail {
  display: grid;
  gap: 14px;
  padding: 16px;
  border-top: 1px solid rgba(212, 175, 55, 0.14);
}

.about-timeline__detail img {
  width: 100%;
  max-width: 180px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 10px;
}

.about-timeline__detail p {
  color: var(--slate-300);
  line-height: 1.8;
  font-size: 0.95rem;
  margin: 0;
}

.about-timeline__more {
  margin: 28px 0 0;
  color: var(--slate-300);
  line-height: 1.7;
}

.about-timeline__more a {
  color: var(--gold-300);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* 03 承诺 */
.about-promise {
  padding: 64px 0;
}

.about-promise__grid {
  display: grid;
  gap: 22px;
}

.about-promise__card {
  padding: 30px 26px;
  border-radius: 14px;
  position: relative;
}

.about-promise__tag {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold-400);
  margin-bottom: 12px;
}

.about-promise__card h3 {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  line-height: 1.3;
  margin: 0 0 6px;
}

.about-promise__card ul {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.about-promise__card li {
  margin-bottom: 10px;
  padding-left: 22px;
  position: relative;
  line-height: 1.6;
}

.about-promise__card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--gold-400);
}

.about-promise__card--safety {
  background: var(--cream-100);
  color: var(--ink-900);
  border: 2px solid var(--gold-400);
  box-shadow: 8px 8px 0 rgba(212, 175, 55, 0.14);
}

.about-promise__card--safety .about-promise__tag {
  color: var(--gold-dark);
}

.about-promise__card--safety h3 {
  color: var(--ink-900);
}

.about-promise__card--safety li {
  color: var(--ink-900);
}

.about-promise__card--safety li::before {
  background: var(--gold-dark);
}

.about-promise__card--stability {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.16), rgba(109, 40, 217, 0.26));
  border: 1px solid rgba(139, 92, 246, 0.42);
  color: var(--white);
}

/* 04 生态与认证 */
.about-ecosystem {
  padding: 64px 0;
  background: linear-gradient(180deg, rgba(212, 175, 55, 0.04), transparent);
}

.about-ecosystem__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.about-ecosystem__content h3 {
  position: relative;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--gold-300);
  margin: 24px 0 8px;
  padding-left: 16px;
}

.about-ecosystem__content h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.16em;
  width: 4px;
  height: 1.05em;
  background: linear-gradient(180deg, var(--gold-400), var(--violet-500));
  border-radius: 2px;
}

.about-ecosystem__content p {
  color: var(--slate-300);
  line-height: 1.8;
  margin: 0 0 8px;
}

.about-ecosystem__figure {
  margin: 0;
}

.about-ecosystem__figure img {
  width: 100%;
  height: auto;
  border-radius: 14px;
  border: 1px solid rgba(212, 175, 55, 0.35);
  box-shadow: var(--shadow-float);
}

/* CTA */
.about-cta {
  padding: 32px 0 72px;
}

.about-cta__box {
  background:
    var(--about-violet-glow),
    var(--navy-900);
  border: 1px solid rgba(212, 175, 55, 0.32);
  border-radius: 20px;
  padding: 48px 26px;
  text-align: center;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  position: relative;
}

.about-cta__box h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  margin: 0;
}

.about-cta__box p {
  color: var(--slate-300);
  max-width: 660px;
  margin: 16px auto 0;
  line-height: 1.75;
}

.about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 28px;
}

/* 锚点到达高亮 */
.page-about section[id]:target .section__title {
  color: var(--gold-300);
  transition: color var(--transition);
}

/* 响应式 */
@media (min-width: 700px) {
  .about-timeline__summary {
    padding: 18px 20px;
  }

  .about-timeline__detail {
    grid-template-columns: 180px 1fr;
    align-items: center;
    gap: 20px;
    padding: 18px 20px;
  }

  .about-promise__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

  .about-hero__figure img {
    aspect-ratio: 7 / 5;
    object-fit: cover;
  }
}

@media (min-width: 900px) {
  .about-hero {
    padding: 48px 0 80px;
  }

  .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 64px;
    align-items: center;
  }

  .page-about .section__header {
    flex-direction: row;
    align-items: baseline;
    gap: 24px;
  }

  .about-origin__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 56px;
    align-items: center;
  }

  .about-timeline__version {
    font-size: 2rem;
    min-width: 64px;
  }

  .about-promise__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 32px;
  }

  .about-ecosystem__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 56px;
  }

  .about-cta__box {
    padding: 64px 48px;
  }
}