/* ===== 品牌中心 /brand/ ===== */
.page-about {
  --about-sticky: 58px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: 26px;
  padding-bottom: 34px;
}

.page-about .about-hero::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: 34px;
  background: linear-gradient(90deg, var(--c-gold), rgba(201, 162, 75, 0) 68%);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 7.2vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-about .about-hero .lede {
  margin-top: 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-facts li {
  padding-top: 10px;
  border-top: 1px solid rgba(201, 162, 75, 0.45);
}

.page-about .hero-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-pulse);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-facts__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-bottom: 56px;
}

/* ---------- 左侧品牌索引（移动端为吸顶胶囊带） ---------- */
.page-about .brand-index {
  position: sticky;
  top: 0;
  z-index: 6;
  margin: 0;
  padding: 9px 0;
  background: rgba(6, 26, 46, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(22, 73, 122, 0.65);
}

.page-about .brand-index__label {
  margin: 0 0 7px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-about .brand-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 3px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .brand-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .brand-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--c-mist);
  text-decoration: none;
  background: rgba(22, 73, 122, 0.32);
  border: 1px solid rgba(22, 73, 122, 0.7);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
  transition: color var(--speed) var(--ease), background var(--speed) var(--ease),
    border-color var(--speed) var(--ease);
}

.page-about .brand-index__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--c-gold);
}

.page-about .brand-index__link:hover,
.page-about .brand-index__link:focus-visible {
  color: var(--c-white);
  background: rgba(22, 73, 122, 0.6);
  border-color: rgba(180, 255, 61, 0.6);
}

/* ---------- 右侧堆叠面板序列 ---------- */
.page-about .about-panels {
  display: flex;
  flex-direction: column;
  gap: 26px;
  min-width: 0;
}

.page-about .about-panel {
  position: relative;
  scroll-margin-top: 120px;
  padding: 20px 16px 24px;
  background: linear-gradient(180deg, rgba(14, 44, 74, 0.78), rgba(6, 26, 46, 0.58));
  border-top: 1px solid rgba(22, 73, 122, 0.9);
  border-bottom: 1px solid rgba(22, 73, 122, 0.4);
}

/* 面板右缘的短刻度线 */
.page-about .about-panel::after {
  content: "";
  position: absolute;
  top: 22px;
  right: 0;
  width: 4px;
  height: 86px;
  background-image: linear-gradient(180deg, var(--c-gold) 0 1px, transparent 1px 12px);
  background-size: 4px 12px;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding-bottom: 13px;
  margin-bottom: 20px;
  border-bottom: 1px dashed rgba(22, 73, 122, 0.75);
}

.page-about .about-panel__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-gold);
  border: 1px solid rgba(201, 162, 75, 0.5);
  padding: 3px 7px;
  line-height: 1;
}

.page-about .about-panel__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 4.6vw, 29px);
  line-height: 1.25;
  color: var(--c-white);
}

.page-about .about-panel__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-mist);
}

.page-about .about-panel__body > p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-subtitle {
  margin: 28px 0 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
  padding-left: 10px;
  border-left: 2px solid var(--c-orange);
}

/* ---------- 主张：不对称分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-split__main > p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .stance-list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stance-item {
  padding: 2px 0 2px 15px;
  border-left: 2px solid var(--c-orange);
}

.page-about .stance-item:nth-child(2) {
  border-left-color: var(--c-pulse);
}

.page-about .stance-item:nth-child(3) {
  border-left-color: var(--c-gold);
}

.page-about .stance-item h3 {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .stance-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  background: var(--c-tactical);
  border: 1px solid rgba(22, 73, 122, 0.85);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--banner img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--wide {
  margin: 0 0 22px;
}

/* ---------- 发展历程时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid rgba(22, 73, 122, 0.85);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-pulse);
  box-shadow: 0 0 0 3px rgba(180, 255, 61, 0.16);
}

.page-about .timeline__item:last-child::before {
  background: var(--c-orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 26, 0.2);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--c-gold);
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .timeline__more {
  margin-top: 9px;
  padding-top: 8px;
  border-top: 1px dashed rgba(22, 73, 122, 0.7);
}

.page-about .timeline__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-pulse);
}

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

.page-about .timeline__more summary::after {
  content: " +";
}

.page-about .timeline__more[open] summary::after {
  content: " −";
}

.page-about .timeline__more summary:focus-visible {
  outline: 2px solid var(--c-pulse);
  outline-offset: 3px;
}

.page-about .timeline__more p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 团队 ---------- */
.page-about .team-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .team-stat {
  padding: 16px 14px 18px;
  background: rgba(22, 73, 122, 0.3);
  border-top: 2px solid var(--c-float);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 13px), calc(100% - 13px) 100%, 0 100%);
}

.page-about .team-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-white);
  font-variant-numeric: tabular-nums;
}

.page-about .team-stat__role {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-pulse);
}

.page-about .team-stat:nth-child(2) .team-stat__role {
  color: var(--c-orange);
}

.page-about .team-stat:nth-child(3) .team-stat__role {
  color: var(--c-gold);
}

.page-about .team-stat__desc {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .flow-steps {
  counter-reset: flow;
  display: grid;
  gap: 1px;
  margin: 14px 0 0;
  padding: 1px;
  list-style: none;
  background: rgba(22, 73, 122, 0.55);
  border: 1px solid rgba(22, 73, 122, 0.55);
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 10px;
  padding: 12px 13px;
  background: rgba(6, 26, 46, 0.94);
}

.page-about .flow-step::before {
  counter-increment: flow;
  content: counter(flow, decimal-leading-zero);
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
  padding-top: 2px;
}

.page-about .flow-step strong {
  grid-column: 2;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .flow-step span {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .flow-steps + .about-figure {
  margin-top: 24px;
}

/* ---------- 数据协作与生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .eco-card {
  padding: 3px 0 3px 16px;
  border-left: 3px solid var(--c-orange);
}

.page-about .eco-card:nth-child(2) {
  border-left-color: var(--c-pulse);
}

.page-about .eco-card:nth-child(3) {
  border-left-color: var(--c-float);
}

.page-about .eco-card:nth-child(4) {
  border-left-color: var(--c-gold);
}

.page-about .eco-card h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .eco-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 内容质量 ---------- */
.page-about .quality-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 4px;
}

.page-about .q-card {
  padding: 16px 15px 18px;
  background: rgba(14, 44, 74, 0.62);
  border-left: 3px solid var(--c-orange);
}

.page-about .q-card--pulse {
  border-left-color: var(--c-pulse);
}

.page-about .q-card--gold {
  border-left-color: var(--c-gold);
}

.page-about .q-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .q-card--pulse .q-card__num {
  color: var(--c-pulse);
}

.page-about .q-card--gold .q-card__num {
  color: var(--c-gold);
}

.page-about .q-card__num em {
  margin-left: 5px;
  font-family: var(--font-body);
  font-style: normal;
  font-size: 14px;
  font-weight: 400;
  color: var(--c-mist);
}

.page-about .q-card h3 {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .q-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .quality-note {
  margin-top: 20px;
  padding: 16px 16px 18px;
  background: rgba(22, 73, 122, 0.24);
  border: 1px solid rgba(22, 73, 122, 0.7);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .quality-note h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .quality-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 表达规范 ---------- */
.page-about .spec-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .spec-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .spec-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .spec-swatch {
  display: block;
  width: 54px;
  height: 5px;
  margin-bottom: 11px;
}

.page-about .spec-swatch--abyss {
  background: linear-gradient(90deg, var(--c-abyss-deep, #04121F), var(--c-float));
}

.page-about .spec-swatch--orange {
  background: linear-gradient(90deg, var(--c-orange), var(--c-orange-soft));
}

.page-about .spec-swatch--pulse {
  background: linear-gradient(90deg, var(--c-pulse), rgba(180, 255, 61, 0.25));
}

.page-about .spec-swatch--gold {
  background: linear-gradient(90deg, var(--c-gold), rgba(201, 162, 75, 0.2));
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  position: relative;
  padding: 24px 18px 26px;
  background: linear-gradient(135deg, rgba(255, 106, 26, 0.14), rgba(14, 44, 74, 0.7) 46%, rgba(6, 26, 46, 0.6));
  border: 1px solid rgba(255, 106, 26, 0.42);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 4.6vw, 26px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--c-white);
}

.page-about .about-cta p {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 640px) {
  .page-about .team-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .spec-grid,
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 24px;
  }

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

  .page-about .q-card--gold {
    grid-column: 1 / -1;
  }
}

@media (min-width: 780px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .about-panel {
    padding: 24px 24px 28px;
  }
}

/* ---------- 桌面：左索引 + 右面板 ---------- */
@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .brand-index {
    position: sticky;
    top: 104px;
    z-index: 1;
    padding: 2px 0 2px 16px;
    background: none;
    backdrop-filter: none;
    border-bottom: 0;
    border-left: 1px solid rgba(201, 162, 75, 0.38);
  }

  .page-about .brand-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .brand-index__link {
    display: flex;
    width: 100%;
    padding: 8px 10px 8px 0;
    background: none;
    border: 0;
    border-left: 2px solid transparent;
    clip-path: none;
    margin-left: -2px;
    padding-left: 12px;
  }

  .page-about .brand-index__link:hover,
  .page-about .brand-index__link:focus-visible {
    background: rgba(22, 73, 122, 0.32);
    border-left-color: var(--c-pulse);
    color: var(--c-white);
  }

  .page-about .about-hero {
    padding-top: 36px;
    padding-bottom: 44px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-panels {
    gap: 30px;
  }

  .page-about .about-panel:nth-child(even) {
    margin-left: 42px;
  }

  .page-about .quality-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .q-card--gold {
    grid-column: auto;
  }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .brand-index__link,
  .page-about .q-card,
  .page-about .team-stat {
    transition: none;
  }
}