/* ===== 品牌介绍页 · page-about ===== */

.page-about {
  --about-rail: 132px;
  --about-measure: 66ch;
  background: var(--field);
  color: var(--white);
  padding-bottom: clamp(48px, 7vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(32px, 6vw, 80px) 0 clamp(28px, 4vw, 48px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -60%;
  left: 0;
  right: 0;
  height: min(680px, 120vw);
  background:
    radial-gradient(56% 66% at 18% 0%, rgba(44, 242, 200, 0.20), transparent 70%),
    radial-gradient(46% 60% at 88% 8%, rgba(138, 107, 255, 0.17), transparent 72%);
  z-index: -1;
  pointer-events: none;
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(28px, 5.8vw, 46px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.022em;
  color: var(--white);
  max-width: 19ch;
}

.page-about .about-lede {
  margin-top: clamp(18px, 2.6vw, 28px);
  max-width: 62ch;
}

.page-about .about-lede p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-lede p:first-child {
  font-size: clamp(16px, 1.6vw, 18px);
  font-weight: 500;
  line-height: 1.8;
  color: var(--white);
}

.page-about .about-lede p:last-child {
  margin-bottom: 0;
}

.page-about .about-marks {
  list-style: none;
  margin: clamp(22px, 3.2vw, 34px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-marks li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(18, 59, 49, 0.58);
  font-size: 13px;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-marks .mono {
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan);
}

/* ---------- 章节锚点条 ---------- */
.page-about .about-toc {
  border-top: 1px solid rgba(30, 90, 72, 0.55);
  border-bottom: 1px solid rgba(30, 90, 72, 0.55);
  background: rgba(11, 42, 34, 0.62);
}

.page-about .about-toc__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 12px;
  padding-bottom: 12px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__inner::-webkit-scrollbar {
  height: 3px;
}

.page-about .about-toc__inner::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 3px;
}

.page-about .about-toc .toc-link {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link[aria-current="true"] {
  color: var(--field);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(42px, 6.5vw, 82px) 0;
}

.page-about .chapter--band {
  background: linear-gradient(172deg, var(--turf) 0%, var(--field) 74%);
  border-top: 1px solid rgba(30, 90, 72, 0.45);
  border-bottom: 1px solid rgba(30, 90, 72, 0.45);
}

.page-about .chapter-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 28px);
}

.page-about .chapter-rail {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 18px;
}

.page-about .chapter-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(44, 242, 200, 0.13);
}

.page-about .chapter-num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .chapter-year {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .chapter-body {
  min-width: 0;
}

.page-about .chapter-body .section-title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.016em;
  color: var(--white);
}

.page-about .chapter-prose {
  max-width: var(--about-measure);
}

.page-about .chapter-prose p {
  margin: 0 0 15px;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(234, 253, 247, 0.8);
}

.page-about .chapter-prose p:last-child {
  margin-bottom: 0;
}

.page-about .chapter-statement {
  max-width: 30ch;
  margin: clamp(24px, 3.6vw, 38px) 0;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 32px);
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(100deg, rgba(44, 242, 200, 0.14), rgba(44, 242, 200, 0) 78%);
  font-size: clamp(17px, 2.4vw, 23px);
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -0.012em;
  color: var(--white);
}

/* ---------- 图框 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.2vw, 34px) 0 0;
  max-width: var(--about-measure);
}

.page-about .about-figure .figure-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--turf);
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--full .figure-frame {
  aspect-ratio: 10 / 7;
}

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

.page-about .about-figure .figure-cap {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 数据流四步 ---------- */
.page-about .data-flow {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
  max-width: var(--about-measure);
}

.page-about .flow-step {
  padding: 15px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--turf);
}

.page-about .flow-num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--violet);
  margin-bottom: 9px;
}

.page-about .flow-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .flow-note {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  position: relative;
  max-width: var(--about-measure);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(44, 242, 200, 0.06));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 30px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--field);
  border: 2px solid var(--cyan);
}

.page-about .tl-stage {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .tl-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(234, 253, 247, 0.78);
}

/* ---------- 规模数字 ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .scale-card {
  position: relative;
  padding: 18px 15px 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, var(--glass) 0%, var(--turf) 100%);
  overflow: hidden;
}

.page-about .scale-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), rgba(44, 242, 200, 0.15));
}

.page-about .scale-card:nth-child(2n)::before {
  background: linear-gradient(180deg, var(--violet), rgba(138, 107, 255, 0.15));
}

.page-about .scale-value {
  display: inline-block;
  font-size: clamp(28px, 5.2vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--cyan);
}

.page-about .scale-card:nth-child(2n) .scale-value {
  color: var(--violet);
}

.page-about .scale-unit {
  margin-left: 5px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .scale-label {
  display: block;
  margin-top: 11px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(234, 253, 247, 0.8);
}

/* ---------- 合作与安全卡片 ---------- */
.page-about .partner-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
  max-width: var(--about-measure);
}

.page-about .partner-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--turf);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .partner-card:hover {
  transform: translateY(-3px);
  border-color: rgba(44, 242, 200, 0.55);
}

.page-about .partner-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(234, 253, 247, 0.76);
}

/* ---------- 内容取向 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 13px;
  max-width: var(--about-measure);
}

.page-about .principle {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.2vw, 22px);
  border: 1px solid rgba(30, 90, 72, 0.85);
  border-radius: var(--radius);
  background: rgba(18, 59, 49, 0.5);
}

.page-about .principle-num {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: rgba(44, 242, 200, 0.6);
}

.page-about .principle h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(234, 253, 247, 0.78);
}

/* ---------- 收束区 ---------- */
.page-about .about-next {
  margin-top: clamp(20px, 3vw, 36px);
  padding: clamp(34px, 5.5vw, 64px) 0 clamp(12px, 2vw, 24px);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(58% 82% at 10% 100%, rgba(138, 107, 255, 0.16), transparent 72%),
    radial-gradient(52% 70% at 92% 0%, rgba(44, 242, 200, 0.13), transparent 74%);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-next__text > p:not(.eyebrow) {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-next h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.016em;
  color: var(--white);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .partner-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .chapter-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 3.6vw, 56px);
  }

  .page-about .chapter-rail {
    display: block;
    padding-left: 26px;
    padding-top: 6px;
  }

  .page-about .chapter-rail::before {
    left: 5px;
    top: 12px;
  }

  .page-about .chapter-rail::after {
    content: "";
    position: absolute;
    left: 8px;
    top: 28px;
    bottom: -140px;
    width: 1px;
    background: linear-gradient(180deg, var(--line), rgba(30, 90, 72, 0));
  }

  .page-about .about-chapter:last-of-type .chapter-rail::after {
    display: none;
  }

  .page-about .chapter-num {
    display: block;
    font-size: clamp(54px, 6vw, 78px);
    line-height: 0.88;
    color: rgba(44, 242, 200, 0.3);
  }

  .page-about .chapter-year {
    display: block;
    margin-top: 10px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-figure--full {
    max-width: 100%;
  }
}

@media (min-width: 1180px) {
  .page-about .chapter-body .section-title {
    max-width: 24ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc .toc-link,
  .page-about .partner-card {
    transition: none;
  }

  .page-about .partner-card:hover {
    transform: none;
  }
}