/* ============================================
   PAGE: about — 品牌故事
   作用域: .page-about
   移动端优先，桌面终版
   ============================================ */

.page-about {
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(0, 194, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 194, 255, .05) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--text);
  font-family: var(--font-body);
  overflow: hidden;
}

.page-about .container {
  width: min(100% - 40px, 1200px);
  margin-inline: auto;
}

.page-about .section {
  padding-block: 56px;
  position: relative;
}

.page-about .section-header {
  display: grid;
  gap: 6px;
  margin-bottom: 28px;
  border-left: 3px solid var(--cyan);
  padding-left: 16px;
}

.page-about .section-header__num {
  font-family: var(--font-num);
  color: var(--cyan);
  letter-spacing: .1em;
}

.page-about .section-title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  line-height: 1.2;
  margin: 0;
}

.page-about .section-desc {
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

.page-about .tag {
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--muted);
  padding: 6px 10px;
  font-size: .82rem;
  line-height: 1.4;
}

/* ===== 首屏：档案框景 ===== */

.page-about .about-hero {
  padding: 40px 0 48px;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 18%;
  height: 4px;
  background: linear-gradient(90deg, var(--green), var(--cyan));
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
}

.page-about .about-hero__kicker {
  font-family: var(--font-num);
  color: var(--green);
  font-size: .85rem;
  letter-spacing: .14em;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: .02em;
}

.page-about .about-hero__subtitle {
  margin: 14px 0 0;
  font-family: var(--font-num);
  color: var(--cyan);
  letter-spacing: .12em;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  color: var(--muted);
  line-height: 1.85;
  max-width: 42em;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__index {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(0, 194, 255, .1), rgba(155, 92, 246, .04));
  padding: 20px;
}

.page-about .about-hero__index::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(0, 194, 255, .2);
  pointer-events: none;
}

.page-about .about-hero__index-label {
  display: block;
  font-family: var(--font-num);
  font-size: .82rem;
  color: var(--cyan);
  letter-spacing: .1em;
}

.page-about .about-hero__index-nav {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-hero__index-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: rgba(17, 24, 39, .7);
  color: var(--text);
  text-decoration: none;
  font-size: .95rem;
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .about-hero__index-nav a:hover {
  border-color: var(--cyan);
  background: rgba(0, 194, 255, .08);
}

.page-about .about-hero__index-num {
  font-family: var(--font-num);
  color: var(--orange);
  font-size: .85rem;
}

.page-about .about-hero__index-path {
  display: block;
  margin-top: 16px;
  font-family: var(--font-num);
  font-size: .8rem;
  color: var(--muted);
  text-align: right;
}

/* ===== 01 品牌起源 ===== */

.page-about .about-origin__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-origin__text p {
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 16px;
}

.page-about .about-origin__quote {
  margin: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--purple);
  background: rgba(17, 24, 39, .7);
}

.page-about .about-origin__quote p {
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.8;
  margin: 0;
}

.page-about .about-origin__facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 14px;
}

.page-about .about-origin__facts .data-card {
  border: 1px solid var(--line);
  background: var(--bg-2);
  padding: 16px;
}

/* ===== 02 发展里程碑 ===== */

.page-about .milestone-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  row-gap: 26px;
  margin-top: 36px;
}

.page-about .milestone-grid::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--green), var(--cyan) 50%, var(--purple));
  opacity: .55;
}

.page-about .milestone-item {
  position: relative;
  padding-left: 28px;
}

.page-about .milestone-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(57, 255, 20, .12);
}

.page-about .milestone-card {
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  background: var(--bg-2);
  box-shadow: var(--shadow);
}

.page-about .milestone-card__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
  user-select: none;
}

.page-about .milestone-card__head::-webkit-details-marker {
  display: none;
}

.page-about .milestone-card__year {
  font-family: var(--font-num);
  font-weight: 700;
  color: var(--orange);
}

.page-about .milestone-card__title {
  flex: 1;
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .milestone-card__toggle {
  font-family: var(--font-num);
  font-size: .82rem;
  color: var(--muted);
}

.page-about .milestone-card__toggle::before {
  content: "收起详情";
}

.page-about details:not([open]) .milestone-card__toggle::before {
  content: "展开详情";
}

.page-about .milestone-card__desc {
  margin: 0;
  padding: 0 16px 16px;
  color: var(--muted);
  line-height: 1.75;
}

.page-about .milestone-card--now {
  border-left-color: var(--cyan);
  background: linear-gradient(135deg, rgba(0, 194, 255, .08), rgba(17, 24, 39, 1) 70%);
}

.page-about .about-milestones__figure {
  margin: 32px 0 0;
  max-width: 440px;
}

/* ===== 03 数据积累 ===== */

.page-about .about-data__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 28px;
}

.page-about .about-data__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.page-about .about-data__stats .data-card {
  border: 1px solid var(--line);
  background: var(--bg-2);
  padding: 18px 16px;
}

.page-about .data-card__note {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: .8rem;
  line-height: 1.5;
}

.page-about .about-data__filter {
  margin-top: 32px;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.page-about .about-data__filter-label {
  font-family: var(--font-num);
  color: var(--green);
  font-size: .9rem;
  letter-spacing: .08em;
  margin: 0 0 14px;
}

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

.page-about .filter-btn {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 8px 16px;
  cursor: pointer;
  transition: border-color .2s var(--ease), background .2s var(--ease), color .2s var(--ease);
}

.page-about .filter-btn:hover {
  border-color: var(--cyan);
}

.page-about .filter-btn[aria-pressed="true"],
.page-about .filter-btn.is-active {
  background: rgba(0, 194, 255, .15);
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-data__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 20px;
}

.page-about .about-data__card {
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  background: var(--bg-2);
  padding: 18px;
  margin: 0;
}

.page-about .about-data__card h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  margin: 0 0 8px;
}

.page-about .about-data__card p {
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 12px;
}

/* ===== 04 团队与价值观 ===== */

.page-about .about-team__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-team__copy p {
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 16px;
}

.page-about .about-team__copy strong {
  color: var(--text);
  font-weight: 700;
}

/* ===== 图片框通用 ===== */

.page-about .figure-frame {
  border: 1px solid var(--line);
  background: var(--bg-2);
  padding: 8px;
}

.page-about .figure-frame img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .figure-frame figcaption {
  padding: 12px 8px 6px;
  color: var(--muted);
  font-family: var(--font-num);
  font-size: .8rem;
  line-height: 1.6;
}

/* ===== CTA ===== */

.page-about .about-cta__panel {
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(155, 92, 246, .14), rgba(0, 194, 255, .06) 55%, rgba(57, 255, 20, .04)),
    var(--bg-2);
  padding: 32px 24px;
  position: relative;
}

.page-about .about-cta__panel::before {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  top: -3px;
  height: 3px;
  background: linear-gradient(90deg, var(--green), var(--cyan), var(--purple));
}

.page-about .about-cta__panel h2 {
  font-family: var(--font-head);
  margin: 0;
  font-size: clamp(1.4rem, 4vw, 2rem);
}

.page-about .about-cta__panel p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.8;
  max-width: 48em;
}

.page-about .about-cta__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

/* ===== 桌面端适配 ===== */

@media (min-width: 720px) {
  .page-about .about-data__top {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

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

@media (min-width: 960px) {
  .page-about .section {
    padding-block: 72px;
  }

  .page-about .about-hero {
    padding: 48px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 48px;
  }

  .page-about .about-origin__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 480px);
    gap: 56px;
  }

  .page-about .milestone-grid {
    row-gap: 36px;
  }

  .page-about .milestone-grid::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .milestone-item {
    width: 50%;
    padding-left: 0;
    padding-right: 44px;
    text-align: right;
  }

  .page-about .milestone-item::before {
    left: auto;
    right: -6px;
  }

  .page-about .milestone-item--right {
    width: 50%;
    margin-left: 50%;
    padding-right: 0;
    padding-left: 44px;
    text-align: left;
  }

  .page-about .milestone-item--right::before {
    left: -6px;
    right: auto;
  }

  .page-about .about-milestones__figure {
    margin-top: 48px;
    margin-left: 0;
  }

  .page-about .about-data__top {
    grid-template-columns: minmax(0, 480px) minmax(0, 1fr);
    gap: 48px;
  }

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

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 560px);
    gap: 48px;
  }

  .page-about .about-cta__panel {
    padding: 48px 56px;
  }
}