/* ============================================
   品牌介绍 /about/ — 作用域 .page-about
   ============================================ */

.page-about {
  --ab-rail: 196px;
  --ab-rail-gap: 36px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: 28px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -40px 0 auto 0;
  height: 380px;
  background:
    radial-gradient(58% 100% at 20% 0%, rgba(124, 77, 255, 0.26), transparent 68%),
    radial-gradient(46% 92% at 74% 10%, rgba(63, 216, 210, 0.13), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(33px, 6.4vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  max-width: 62ch;
  margin: 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-hero-facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--deep);
}

.page-about .about-hero-facts .mono {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--gold);
}

.page-about .about-fact-label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--dust);
}

.page-about .about-hero-figure {
  margin: 34px 0 0;
  position: relative;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(120deg, #0A1024 0%, #121A33 58%, #0A1024 100%);
  overflow: hidden;
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1600 / 640;
  object-fit: cover;
  opacity: 0.92;
}

/* ---------- 竖直轨道 + 节点 ---------- */
.page-about .about-flow-section {
  padding-top: 58px;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  row-gap: 0;
}

.page-about .about-rail {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 0 12px;
}

.page-about .about-rail::before {
  display: none;
}

.page-about .about-tick {
  position: static;
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--void);
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-about .about-index {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--dust);
  transition: color 0.35s var(--ease);
}

.page-about .about-rail-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper-dim);
}

.page-about .about-rail.is-visible .about-tick {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 180, 84, 0.14);
}

.page-about .about-rail.is-visible .about-index {
  color: var(--gold);
}

.page-about .about-node {
  padding-bottom: 46px;
}

.page-about .about-node-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 5.4vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-node p {
  max-width: 68ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper-dim);
}

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

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 4px;
  color: var(--cyan);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 216, 210, 0.4);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--gold);
  border-bottom-color: rgba(255, 180, 84, 0.6);
}

/* 图文分栏节点 */
.page-about .about-node--split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-node--split .about-node-main p:last-child {
  margin-bottom: 0;
}

.page-about .about-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--deep);
  overflow: hidden;
}

.page-about .about-node .about-media {
  margin-top: 22px;
}

.page-about .about-node--split .about-media {
  margin-top: 0;
}

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

.page-about .about-media--tall img {
  aspect-ratio: 1200 / 900;
}

.page-about .about-media--wide img {
  aspect-ratio: 1200 / 800;
}

/* ---------- 可折叠处理路径 ---------- */
.page-about .about-details {
  margin-top: 26px;
}

.page-about .about-detail {
  margin: 0 0 10px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.25s var(--ease);
}

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

.page-about .about-detail[open] {
  border-color: rgba(255, 180, 84, 0.42);
}

.page-about .about-detail summary {
  position: relative;
  padding: 15px 18px 15px 42px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
  transition: color 0.25s var(--ease);
}

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

.page-about .about-detail summary::before {
  content: "+";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan);
  transition: color 0.25s var(--ease);
}

.page-about .about-detail[open] summary::before {
  content: "\2212";
  color: var(--gold);
}

.page-about .about-detail summary:hover,
.page-about .about-detail summary:focus-visible {
  color: var(--gold);
}

.page-about .about-detail p {
  max-width: none;
  margin: 0;
  padding: 0 18px 16px 42px;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--dust);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding: 6px 0 76px;
}

.page-about .about-cta-inner {
  position: relative;
  padding: 32px 24px 38px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background:
    radial-gradient(118% 160% at 88% 0%, rgba(124, 77, 255, 0.22), transparent 62%),
    radial-gradient(80% 140% at 4% 100%, rgba(63, 216, 210, 0.14), transparent 66%),
    var(--deep);
  overflow: hidden;
}

.page-about .about-cta-inner::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 3px, transparent 3px 9px);
}

.page-about .about-cta-inner .eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
}

.page-about .about-cta-title {
  margin: 0 0 14px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .about-cta-text {
  max-width: 58ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.76;
  color: var(--paper-dim);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ============================================
   响应式
   ============================================ */
@media (min-width: 600px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-node--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-cta-inner {
    padding: 46px 48px 52px;
  }

  .page-about .about-hero-figure {
    margin-top: 42px;
  }
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: var(--ab-rail-gap);
  }

  .page-about .about-rail {
    display: block;
    padding: 6px 0 68px 34px;
  }

  .page-about .about-rail::before {
    content: "";
    display: block;
    position: absolute;
    left: 11px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--line);
  }

  .page-about .about-tick {
    position: absolute;
    left: 6px;
    top: 12px;
    width: 11px;
    height: 11px;
  }

  .page-about .about-index {
    margin-bottom: 5px;
  }

  .page-about .about-rail-label {
    font-size: 14px;
  }

  .page-about .about-node {
    padding-bottom: 72px;
  }

  .page-about .about-flow-section {
    padding-top: 74px;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero .lead,
  .page-about .about-node p,
  .page-about .about-cta-text {
    font-size: 15.5px;
  }

  .page-about .about-detail summary {
    padding-left: 38px;
  }

  .page-about .about-detail p {
    padding-left: 38px;
  }
}