/* ===== 品牌故事页专属样式 ===== */
.page-about {
  background: var(--c-light);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  margin-bottom: var(--space-3);
}

.page-about .breadcrumbs__link {
  color: var(--c-txt-gray);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus {
  color: var(--c-green);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  background: var(--c-deep);
  color: var(--c-txt-light);
  padding: 3rem 0 4.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -6rem;
  top: -5rem;
  width: 18rem;
  height: 24rem;
  background: var(--c-green);
  opacity: 0.06;
  transform: rotate(16deg);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--c-txt-gray);
  text-transform: uppercase;
  margin: 0 0 var(--space-2);
  padding-left: 1rem;
  border-left: 3px solid var(--c-green);
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 0.95;
  margin: 0 0 var(--space-3);
  letter-spacing: 0.01em;
}

.page-about .ab-hero__title-sub {
  display: block;
  font-size: 0.52em;
  line-height: 1.2;
  color: var(--c-txt-gray);
  margin-top: 0.55em;
  font-family: var(--font-body);
  font-weight: 700;
  max-width: 19em;
}

.page-about .ab-hero__lead {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--c-txt-gray);
  max-width: 34rem;
  margin: 0 0 var(--space-3);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-about .ab-hero__panel {
  margin-top: var(--space-3);
  background: var(--c-glass);
  border: 1px solid var(--c-divider);
  padding: var(--space-3);
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.4rem), calc(100% - 1.4rem) 100%, 0 100%);
}

.page-about .ab-hero__panel-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--c-divider);
  margin-bottom: var(--space-2);
}

.page-about .ab-hero__panel-dot {
  width: 0.6rem;
  height: 0.6rem;
  background: var(--c-green);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(198, 255, 0, 0.6);
  flex-shrink: 0;
}

.page-about .ab-hero__panel-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-txt-light);
}

.page-about .ab-hero__panel-status {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--c-green);
  letter-spacing: 0.1em;
}

.page-about .ab-hero__stats {
  display: grid;
  gap: var(--space-1);
}

.page-about .ab-hero__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-1) 0;
  border-bottom: 1px solid rgba(44, 58, 82, 0.5);
}

.page-about .ab-hero__stat:last-child {
  border-bottom: 0;
}

.page-about .ab-hero__stat .stat-num {
  text-align: left;
  font-size: 1.6rem;
}

.page-about .ab-hero__stat .stat-label {
  text-align: right;
  font-size: 0.8rem;
}

.page-about .ab-hero__panel-note {
  margin: var(--space-2) 0 0;
  font-size: 0.85rem;
  color: var(--c-txt-gray);
  border-left: 3px solid var(--c-orange);
  padding-left: 0.75rem;
}

/* ---------- 品牌缘起 ---------- */
.page-about .ab-origin {
  background: var(--c-light);
  padding: var(--space-4) 0;
}

.page-about .ab-origin__grid {
  display: grid;
  gap: var(--space-3);
}

.page-about .ab-origin__side {
  display: flex;
  align-items: flex-start;
}

.page-about .ab-origin__num-block {
  background: var(--c-deep);
  padding: 1.6rem 1.8rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.2rem), calc(100% - 1.2rem) 100%, 0 100%);
}

.page-about .ab-origin__big-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(3.8rem, 10vw, 6.4rem);
  line-height: 0.85;
  color: var(--c-green);
}

.page-about .ab-origin__side-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--c-txt-gray);
  margin-top: var(--space-1);
}

.page-about .ab-origin__content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--c-deep);
  margin: var(--space-1) 0 var(--space-2);
  line-height: 1.12;
}

.page-about .ab-origin__content h2 span {
  color: var(--c-orange);
}

.page-about .ab-origin__lead {
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--c-deep);
  font-weight: 600;
}

.page-about .ab-origin__content > p:not(.ab-origin__lead) {
  color: var(--c-body-text);
  line-height: 1.7;
  margin: 0 0 var(--space-2);
}

.page-about .ab-origin__points {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  border-top: 1px solid rgba(44, 58, 82, 0.3);
}

.page-about .ab-origin__points li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: 1px solid rgba(44, 58, 82, 0.3);
}

.page-about .ab-origin__points li > span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-orange);
  padding-top: 0.2em;
  flex-shrink: 0;
}

.page-about .ab-origin__points p {
  margin: 0;
  color: var(--c-body-text);
  line-height: 1.6;
}

.page-about .ab-origin__points strong {
  color: var(--c-deep);
  font-weight: 700;
  margin-right: 0.35em;
}

.page-about .ab-origin__link {
  display: inline-block;
  margin-top: var(--space-3);
  color: var(--c-deep);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--c-green);
  padding-bottom: 0.2rem;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .ab-origin__link:hover,
.page-about .ab-origin__link:focus {
  color: var(--c-orange);
  border-color: var(--c-orange);
}

/* ---------- 五年数据积累 ---------- */
.page-about .ab-data {
  background: var(--c-dark);
  color: var(--c-txt-light);
  padding: var(--space-4) 0;
}

.page-about .ab-data__head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.page-about .ab-data__head h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  color: var(--c-green);
  margin: var(--space-1) 0 0;
  line-height: 1.1;
}

.page-about .ab-data__lead {
  color: var(--c-txt-gray);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 32rem;
}

.page-about .ab-data__grid {
  display: grid;
  gap: var(--space-3);
}

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

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 1.1rem;
  top: 0.6rem;
  bottom: 2.4rem;
  width: 2px;
  background: var(--c-divider);
}

.page-about .ab-timeline__item {
  position: relative;
  padding-left: 3.4rem;
  padding-bottom: var(--space-2);
}

.page-about .ab-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-timeline__year {
  position: absolute;
  left: 0;
  top: 0;
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  background: var(--c-deep);
  border: 1px solid var(--c-green);
  color: var(--c-green);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  z-index: 1;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-timeline__body {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid transparent;
  border-left-color: var(--c-divider);
  padding: var(--space-2);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-timeline__body h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  color: var(--c-txt-light);
}

.page-about .ab-timeline__brief {
  margin: 0;
  color: var(--c-txt-gray);
  font-size: 0.95rem;
  line-height: 1.55;
}

.page-about .ab-timeline__detail {
  margin: 0.5rem 0 0;
  color: var(--c-txt-light);
  font-size: 0.9rem;
  line-height: 1.6;
  max-height: none;
  opacity: 1;
}

.page-about .ab-data__aside {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.page-about .ab-data__figure {
  margin: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--c-deep);
}

.page-about .ab-data__figure .figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-data__panel {
  margin: 0;
  background: var(--c-glass);
  border: 1px solid var(--c-divider);
}

.page-about .ab-data__panel-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--c-txt-gray);
  text-transform: uppercase;
  margin: 0 0 var(--space-2);
}

.page-about .ab-data__panel-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
}

.page-about .ab-data__panel-grid > div {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  border-left: 2px solid var(--c-green);
  padding-left: 0.75rem;
}

.page-about .ab-data__panel-grid .stat-num {
  font-size: 1.8rem;
  line-height: 1;
}

.page-about .ab-data__panel-grid .stat-label {
  font-size: 0.8rem;
}

/* ---------- 产品理念 ---------- */
.page-about .ab-idea {
  background: var(--c-light);
  padding: var(--space-4) 0;
  position: relative;
}

.page-about .ab-idea::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0.6rem;
  background: linear-gradient(90deg, var(--c-green) 0 70%, var(--c-orange) 70% 100%);
}

.page-about .ab-idea__grid {
  display: grid;
  gap: var(--space-3);
}

.page-about .ab-idea__figure {
  margin: 0;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--c-deep);
}

.page-about .ab-idea__figure .figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-idea__content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--c-deep);
  margin: var(--space-1) 0 var(--space-2);
  line-height: 1.12;
}

.page-about .ab-idea__lead {
  color: var(--c-deep);
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.6;
}

.page-about .ab-idea__content > p:not(.ab-idea__lead) {
  color: var(--c-body-text);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.page-about .ab-idea__modules {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.page-about .ab-idea__module {
  background: #fff;
  border: 1px solid rgba(44, 58, 82, 0.2);
  padding: var(--space-2);
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-idea__module:hover,
.page-about .ab-idea__module:focus-within {
  border-color: var(--c-green);
  box-shadow: 0 4px 14px rgba(11, 29, 58, 0.08);
}

.page-about .ab-idea__module-num {
  font-family: var(--font-mono);
  color: var(--c-orange);
  font-weight: 700;
  font-size: 0.85rem;
  padding-top: 0.1rem;
  flex-shrink: 0;
}

.page-about .ab-idea__module strong {
  display: block;
  color: var(--c-deep);
  font-size: 0.95rem;
}

.page-about .ab-idea__module div > span {
  color: var(--c-txt-gray);
  font-size: 0.8rem;
  line-height: 1.45;
}

/* ---------- 产品进化 ---------- */
.page-about .ab-evolve {
  background: var(--c-deep);
  color: var(--c-txt-light);
  padding: var(--space-4) 0;
}

.page-about .ab-evolve__head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  color: var(--c-green);
  margin: var(--space-1) 0 var(--space-2);
  line-height: 1.12;
}

.page-about .ab-evolve__lead {
  color: var(--c-txt-gray);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 34rem;
}

.page-about .ab-evolve__grid {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.page-about .ab-evolve__figure {
  margin: 0;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: var(--c-dark);
  max-width: 24rem;
}

.page-about .ab-evolve__figure .figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-evolve__versions {
  display: grid;
  gap: var(--space-2);
}

.page-about .ab-evolve__ver {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--c-divider);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .ab-evolve__ver[open] {
  border-color: var(--c-green);
  background: rgba(198, 255, 0, 0.06);
}

.page-about .ab-evolve__ver summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  font-weight: 700;
  color: var(--c-txt-light);
  transition: color 0.2s ease;
}

.page-about .ab-evolve__ver summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-evolve__ver summary:hover,
.page-about .ab-evolve__ver summary:focus {
  color: var(--c-green);
}

.page-about .ab-ver__tag {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--c-orange);
  background: rgba(255, 107, 0, 0.12);
  padding: 0.2rem 0.5rem;
  flex-shrink: 0;
}

.page-about .ab-evolve__ver p {
  margin: 0;
  padding: 0 var(--space-2) var(--space-2) calc(var(--space-2) + 2.4rem);
  color: var(--c-txt-gray);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ---------- 服务承诺 ---------- */
.page-about .ab-promise {
  background: var(--c-dark);
  color: var(--c-txt-light);
  padding: var(--space-4) 0;
}

.page-about .ab-promise__panel {
  background: var(--c-deep);
  border: 1px solid var(--c-divider);
  border-top: 4px solid var(--c-green);
  padding: var(--space-3) var(--space-2);
  position: relative;
}

.page-about .ab-promise__panel::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 5rem;
  height: 0.35rem;
  background: var(--c-orange);
}

.page-about .ab-promise__panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  color: var(--c-green);
  margin: var(--space-1) 0 var(--space-2);
  line-height: 1.15;
}

.page-about .ab-promise__lead {
  color: var(--c-txt-gray);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 36rem;
}

.page-about .ab-promise__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
  margin: var(--space-3) 0;
}

.page-about .ab-promise__item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--c-divider);
  padding: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .ab-promise__item .stat-num {
  font-size: 1.6rem;
  line-height: 1;
}

.page-about .ab-promise__item .stat-label {
  font-size: 0.8rem;
}

.page-about .ab-promise__statement {
  border-left: 4px solid var(--c-orange);
  padding-left: var(--space-2);
  color: var(--c-txt-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

.page-about .ab-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* ---------- 桌面端布局 ---------- */
@media (min-width: 48rem) {
  .page-about .ab-hero {
    padding: 4.5rem 0 6rem;
  }

  .page-about .ab-hero__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: var(--space-4);
    align-items: center;
  }

  .page-about .ab-hero__panel {
    margin-top: 0;
  }

  .page-about .ab-origin__grid {
    grid-template-columns: minmax(12rem, 0.8fr) minmax(0, 1.4fr);
    gap: var(--space-4);
    align-items: start;
  }

  .page-about .ab-origin__side {
    position: sticky;
    top: calc(var(--header-h) + var(--space-3));
  }

  .page-about .ab-data__head {
    grid-template-columns: 1fr 1fr;
    align-items: end;
    margin-bottom: var(--space-4);
  }

  .page-about .ab-data__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--space-4);
  }

  .page-about .ab-idea__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: center;
  }

  .page-about .ab-idea__modules {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .ab-evolve__grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: var(--space-4);
    align-items: start;
  }

  .page-about .ab-evolve__figure {
    position: sticky;
    top: calc(var(--header-h) + var(--space-3));
  }

  .page-about .ab-promise__panel {
    padding: var(--space-4);
  }

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

/* 桌面端带hover能力时，时间线细节收起并随节点展开 */
@media (hover: hover) and (min-width: 48rem) {
  .page-about .ab-timeline__detail {
    max-height: 0;
    opacity: 0;
    margin: 0;
    overflow: hidden;
    transition: max-height 0.25s ease, opacity 0.25s ease, margin 0.25s ease;
  }

  .page-about .ab-timeline__item:hover .ab-timeline__detail,
  .page-about .ab-timeline__item:focus-within .ab-timeline__detail {
    max-height: 12rem;
    opacity: 1;
    margin-top: 0.5rem;
  }

  .page-about .ab-timeline__item:hover .ab-timeline__year,
  .page-about .ab-timeline__item:focus-within .ab-timeline__year {
    background: var(--c-green);
    color: var(--c-dark);
    box-shadow: var(--shadow-green);
  }

  .page-about .ab-timeline__item:hover .ab-timeline__body,
  .page-about .ab-timeline__item:focus-within .ab-timeline__body {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--c-green);
  }
}