/* ================= 品牌档案 /introduction/ ================= */

.page-about {
  --about-gap: clamp(1rem, 2.4vw, 1.6rem);
  --about-head-w: 60ch;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink);
  padding: calc(var(--header-h) + clamp(2rem, 6vw, 4.2rem)) 0 clamp(3rem, 8vw, 5.5rem);
}

.page-about .about-hero-visual {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .5;
}

.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 82% at 76% 6%, rgba(108, 75, 216, .42), transparent 62%),
    linear-gradient(180deg, rgba(7, 11, 31, .58) 0%, rgba(7, 11, 31, .84) 58%, var(--ink) 100%);
}

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

.page-about .about-hero-body .breadcrumbs {
  margin-bottom: clamp(1.3rem, 4vw, 2.2rem);
  color: var(--mist);
}

.page-about .about-crumb-sep {
  margin: 0 .45rem;
  color: rgba(185, 192, 216, .5);
}

.page-about .about-hero-body h1 {
  margin: .7rem 0 1.1rem;
  max-width: 17ch;
  color: var(--white);
}

.page-about .about-hero-body .lede {
  max-width: 46ch;
  color: var(--body-dark);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .about-hero-note {
  display: none;
}

@media (min-width: 1100px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 5rem);
    padding-bottom: 6.5rem;
  }

  .page-about .about-hero-note {
    display: block;
    position: absolute;
    z-index: 2;
    top: calc(var(--header-h) + 3.2rem);
    right: clamp(1.2rem, calc(50vw - 640px), 7rem);
    color: var(--amber);
    font-size: 12px;
    opacity: .85;
  }
}

/* ---------- 章节通用头部 ---------- */

.page-about .about-section-head {
  max-width: var(--about-head-w);
  margin-bottom: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .about-section-head .lede {
  margin-top: .9rem;
}

.page-about .chapter-num {
  display: block;
  font-size: clamp(3.2rem, 11vw, 7.5rem);
  font-weight: 900;
  line-height: .84;
  letter-spacing: -.05em;
  color: rgba(185, 192, 216, .2);
  font-variant-numeric: tabular-nums;
  margin-bottom: .3rem;
}

/* ---------- 缘起 ---------- */

.page-about .about-origin-inner {
  position: relative;
  display: grid;
  gap: 1.6rem;
}

.page-about .about-origin-copy h2 {
  margin: .9rem 0 1rem;
}

.page-about .about-origin-copy .prose + .prose {
  margin-top: 1rem;
}

.page-about .about-origin-side {
  display: flex;
  flex-direction: column;
  gap: .8rem;
  align-items: flex-start;
}

.page-about .about-side-note {
  margin: 0;
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-origin-inner {
    grid-template-columns: minmax(0, 4.2fr) minmax(0, 1.4fr);
    column-gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-origin-copy {
    grid-column: 1;
  }

  .page-about .about-origin-inner > .chapter-num {
    grid-column: 1;
  }

  .page-about .about-origin-side {
    grid-column: 2;
    grid-row: 1 / span 2;
    padding-top: .6rem;
    border-left: 1px solid var(--line-dark);
    padding-left: clamp(1rem, 2.5vw, 1.8rem);
  }
}

/* ---------- 六大栏目 ---------- */

.page-about .about-columns-layout {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}

.page-about .about-columns-grid {
  list-style: none;
  margin: 0;
  padding: 0 0 .6rem;
  display: grid;
  gap: .9rem;
}

.page-about .about-col-card {
  position: relative;
  padding: 1.3rem 1.9rem 1.3rem 1.3rem;
  border: 1px solid var(--line-dark);
  border-radius: 18px;
  background: linear-gradient(158deg, rgba(16, 27, 68, .88), rgba(7, 11, 31, .62));
  overflow: hidden;
  transition: border-color .35s var(--ease), transform .35s var(--ease);
}

.page-about .about-col-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--neon), var(--amber));
  transform: scaleY(.22);
  transform-origin: top;
  transition: transform .45s var(--ease);
}

.page-about .about-col-card:hover,
.page-about .about-col-card:focus-within {
  border-color: rgba(108, 75, 216, .6);
  transform: translateY(-3px);
}

.page-about .about-col-card:hover::before,
.page-about .about-col-card:focus-within::before {
  transform: scaleY(1);
}

.page-about .about-col-idx {
  display: block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-col-title {
  margin: .45rem 0 .5rem;
  font-size: clamp(1.15rem, 3.2vw, 1.4rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-col-desc {
  margin: 0;
  font-size: .95rem;
  line-height: 1.72;
  color: var(--body-dark);
}

.page-about .about-col-more {
  margin: .5rem 0 0;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--cyan);
}

.page-about .about-col-vname {
  position: absolute;
  right: .62rem;
  top: 1.2rem;
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: .34em;
  color: rgba(185, 192, 216, .38);
  pointer-events: none;
}

@media (min-width: 640px) {
  .page-about .about-columns-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-col-card:nth-child(2n) {
    margin-top: 1.5rem;
  }
}

@media (hover: hover) and (pointer: fine) and (min-width: 640px) {
  .page-about .about-col-more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .4s var(--ease), opacity .3s var(--ease);
  }

  .page-about .about-col-card:hover .about-col-more,
  .page-about .about-col-card:focus-within .about-col-more {
    max-height: 7rem;
    opacity: 1;
  }
}

@media (min-width: 980px) {
  .page-about .about-columns-layout {
    grid-template-columns: minmax(0, 1.75fr) minmax(0, .82fr);
    align-items: start;
  }
}

.page-about .about-columns-media {
  position: relative;
  margin: 0;
  aspect-ratio: 1 / 1;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line-dark);
}

.page-about .about-columns-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s var(--ease);
}

.page-about .about-columns-media:hover img {
  transform: scale(1.04);
}

.page-about .about-columns-media .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 2.6rem 1rem .9rem;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--body-dark);
  background: linear-gradient(180deg, transparent, rgba(7, 11, 31, .92));
}

@media (max-width: 979px) {
  .page-about .about-columns-media {
    aspect-ratio: 16 / 10;
  }
}

/* ---------- 内容生产 ---------- */

.page-about .about-craft-layout {
  display: grid;
  gap: clamp(1.4rem, 3.4vw, 2.6rem);
}

.page-about .about-craft-media {
  position: relative;
  margin: 0;
  aspect-ratio: 7 / 4;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line-dark);
}

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

.page-about .about-craft-media .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 2.6rem 1rem .9rem;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--body-dark);
  background: linear-gradient(180deg, transparent, rgba(7, 11, 31, .92));
}

.page-about .about-craft-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.page-about .about-fact {
  padding: 1.1rem 1rem 1.2rem;
  border-top: 1px solid rgba(240, 169, 59, .45);
  background: linear-gradient(180deg, rgba(43, 27, 77, .38), transparent 78%);
  border-radius: 0 0 12px 12px;
}

.page-about .about-fact-num {
  display: block;
  font-size: clamp(2.1rem, 8.4vw, 3.4rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.035em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact-unit {
  font-size: .42em;
  font-weight: 700;
  letter-spacing: .04em;
  margin-left: .18em;
  color: var(--mist);
}

.page-about .about-fact-label {
  margin: .6rem 0 0;
  font-size: .84rem;
  line-height: 1.62;
  color: var(--mist);
}

.page-about .about-craft-note {
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line-dark);
}

@media (min-width: 900px) {
  .page-about .about-craft-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-craft-facts {
    gap: 1.2rem;
  }
}

/* ---------- 覆盖与合作 ---------- */

.page-about .about-reach-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-reach-card {
  position: relative;
  padding: clamp(1.3rem, 3.6vw, 2rem);
  border: 1px solid var(--line-dark);
  border-radius: 20px;
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(63, 224, 208, .12), transparent 58%),
    linear-gradient(150deg, rgba(16, 27, 68, .92), rgba(43, 27, 77, .72));
  overflow: hidden;
}

.page-about .about-reach-num {
  display: block;
  font-size: clamp(2.8rem, 13vw, 6rem);
  font-weight: 900;
  line-height: .9;
  letter-spacing: -.045em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-reach-card--wide .about-reach-num {
  color: var(--amber);
}

.page-about .about-reach-unit {
  display: block;
  margin-top: .55rem;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .about-reach-card p {
  margin: 1rem 0 0;
  font-size: .96rem;
  line-height: 1.78;
  color: var(--body-dark);
  max-width: 46ch;
}

@media (min-width: 800px) {
  .page-about .about-reach-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .about-reach-card--wide {
    padding-right: clamp(2rem, 5vw, 4rem);
  }
}

/* ---------- 发展阶段时间线 ---------- */

.page-about .about-road-scroller {
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(240, 169, 59, .5) transparent;
}

.page-about .about-road-scroller:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-road-track {
  list-style: none;
  margin: 0;
  padding: .4rem max(1.3rem, calc((100vw - 1240px) / 2 + 1.3rem)) 1.8rem;
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
}

.page-about .about-road-node {
  position: relative;
  flex: 0 0 min(80vw, 340px);
  scroll-snap-align: start;
  padding-top: 2.4rem;
}

.page-about .about-road-node::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  right: calc(-1 * clamp(1rem, 3vw, 2rem));
  height: 1px;
  background: linear-gradient(90deg, rgba(240, 169, 59, .7), rgba(108, 75, 216, .55));
}

.page-about .about-road-node:last-child::before {
  right: 0;
  background: linear-gradient(90deg, rgba(240, 169, 59, .7), transparent);
}

.page-about .about-road-dot {
  position: absolute;
  top: 4px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(240, 169, 59, .16);
}

.page-about .about-road-node h3 {
  margin: .6rem 0 .55rem;
  font-size: clamp(1.15rem, 3.4vw, 1.45rem);
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .about-road-node p:not(.tag) {
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--body-dark);
}

/* ---------- 纸色行动区块 ---------- */

.page-about .about-cta {
  width: var(--shell);
  margin: 0 auto clamp(3rem, 7vw, 5rem);
  position: relative;
  overflow: hidden;
  background: var(--paper);
  color: var(--body-paper);
  border-radius: var(--r-lg);
  padding: clamp(1.8rem, 5vw, 3.4rem);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--neon), var(--amber), var(--ember));
}

.page-about .about-cta-inner {
  width: auto;
  max-width: 100%;
}

.page-about .about-cta .eyebrow {
  color: var(--ember);
}

.page-about .about-cta h2 {
  margin: .5rem 0 1rem;
  max-width: 24ch;
  color: var(--body-paper);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.82;
  color: rgba(42, 31, 26, .84);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.3rem, 3.6vw, 2rem);
}

.page-about .about-cta .btn--paper {
  border-color: rgba(42, 31, 26, .28);
  color: var(--body-paper);
  background: transparent;
}

.page-about .about-cta .btn--paper:hover {
  border-color: var(--body-paper);
  background: rgba(42, 31, 26, .06);
}

.page-about .about-cta-foot {
  margin: 1.2rem 0 0;
  font-size: .88rem;
  line-height: 1.75;
  color: rgba(42, 31, 26, .74);
}

.page-about .about-cta-foot a {
  color: var(--body-paper);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--ember);
}

@media (max-width: 560px) {
  .page-about .about-cta-actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }
}

/* ---------- 细节兜底 ---------- */

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-columns-media img,
.page-about .about-craft-media img {
  height: 100%;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-col-card,
  .page-about .about-col-card::before,
  .page-about .about-columns-media img,
  .page-about .about-col-more {
    transition: none;
  }

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

  .page-about .about-columns-media:hover img {
    transform: none;
  }
}