/* ===== 品牌档案 · page-about ===== */
.page-about {
  --ab-pad: clamp(1.25rem, 4vw, 3rem);
  --ab-col-gap: clamp(1.5rem, 3vw, 3rem);
  background:
    radial-gradient(ellipse at 85% 8%, rgba(191, 0, 255, .12) 0%, transparent 55%),
    radial-gradient(ellipse at 8% 65%, rgba(57, 255, 20, .07) 0%, transparent 45%);
  color: var(--c-slate);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

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

/* 面包屑 */
.page-about .leyu-breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1rem var(--ab-pad) 0;
  font-size: var(--fs-caption);
  letter-spacing: .06em;
  color: var(--c-slate);
}

.page-about .leyu-breadcrumb a {
  color: var(--c-frost);
  text-decoration: none;
  transition: color .2s ease;
}

.page-about .leyu-breadcrumb a:hover {
  color: var(--c-neon);
}

/* Hero */
.page-about__hero {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(2.5rem, 7vw, 5.5rem) var(--ab-pad) clamp(2rem, 5vw, 4rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: -6%;
  top: 4%;
  width: 44vw;
  height: 44vw;
  max-width: 380px;
  max-height: 380px;
  background: radial-gradient(circle, rgba(191, 0, 255, .2) 0%, transparent 68%);
  pointer-events: none;
}

.page-about__hero-copy {
  position: relative;
  z-index: 1;
}

.page-about__hero-copy .leyu-code-tag {
  display: inline-block;
  color: var(--c-neon);
  border-color: var(--line-neon);
}

.page-about__hero-copy h1 {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--c-frost);
  margin: 1rem 0 1.25rem;
  transform: skew(-4deg);
}

.page-about__hero-copy > p {
  max-width: 58ch;
  margin: 0 0 2rem;
  font-size: 1.125rem;
  color: var(--c-slate);
}

.page-about__hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about__hero-stats div {
  padding: .8rem 1.1rem;
  border: 1px solid var(--line);
  background: rgba(10, 25, 47, .55);
  font-size: var(--fs-caption);
  color: var(--c-slate);
  letter-spacing: .08em;
  transform: skew(-4deg);
  backdrop-filter: blur(4px);
}

.page-about__hero-stats span {
  display: block;
  margin-bottom: .25rem;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1;
  color: var(--c-neon);
}

.page-about__hero-visual {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
}

.page-about__hero-visual svg {
  width: 100%;
  max-width: 520px;
  height: auto;
  filter: drop-shadow(0 24px 44px rgba(0, 0, 0, .45));
}

/* 章节通用 */
.page-about__section {
  max-width: calc(var(--container) + 3rem);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5rem) var(--ab-pad);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about__section-index {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--c-slate);
}

.page-about__section-index span {
  font-family: var(--font-body);
  font-size: var(--fs-caption);
  font-weight: 500;
  letter-spacing: .35em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.page-about__section-body {
  min-width: 0;
}

/* 共享章节标题微调 */
.page-about .leyu-section-head {
  padding-bottom: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.page-about .leyu-section-kicker {
  display: block;
  margin-bottom: .5rem;
  font-size: var(--fs-caption);
  letter-spacing: .5em;
  text-transform: uppercase;
  color: var(--c-purple);
}

.page-about .leyu-section-title {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1;
  color: var(--c-frost);
  transform: skew(-5deg);
}

/* 导语 */
.page-about__lead {
  margin: 0 0 1.25rem;
  padding-inline-start: 1rem;
  border-inline-start: 3px solid var(--c-neon);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--c-frost);
}

/* 暖纸卡片 */
.page-about__paper-card {
  position: relative;
  padding: 1.5rem;
  border: 1px solid rgba(10, 25, 47, .25);
  background: var(--c-paper);
  color: var(--c-ink);
  box-shadow: 8px 8px 0 rgba(191, 0, 255, .18);
}

.page-about__paper-card::after {
  content: "";
  position: absolute;
  top: 6px;
  right: -6px;
  bottom: -6px;
  left: 6px;
  border: 1px solid rgba(191, 0, 255, .3);
  pointer-events: none;
}

.page-about__paper-card .leyu-badge {
  background: var(--c-purple);
  color: #fff;
}

.page-about__paper-card h3 {
  margin: 1rem 0 .5rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 800;
  color: var(--c-ink);
  transform: skew(-3deg);
}

.page-about__paper-card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.7;
  color: rgba(13, 17, 23, .8);
}

.page-about__paper-card ul {
  list-style: none;
  margin: 1rem 0 0;
  padding: .75rem 0 0;
  border-top: 1px dashed rgba(13, 17, 23, .3);
}

.page-about__paper-card li {
  position: relative;
  padding: .3rem 0 .3rem 1.25rem;
  font-size: .9rem;
}

.page-about__paper-card li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--c-purple);
  font-weight: 700;
}

/* 01 我们是谁 */
.page-about__story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-col-gap);
}

.page-about__story-main p {
  margin-bottom: 1.1rem;
}

.page-about__figure {
  margin: 1.75rem 0 0;
  padding: .5rem;
  border: 1px solid var(--line);
  background: rgba(10, 25, 47, .4);
}

.page-about__figure img {
  border-radius: var(--radius);
}

.page-about__figure figcaption {
  padding: .6rem .4rem .2rem;
  font-size: var(--fs-caption);
  color: var(--c-slate);
}

/* 02 发展里程碑 */
.page-about__timeline-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-col-gap);
}

.page-about__timeline {
  list-style: none;
  display: grid;
  margin: 0;
  padding: .5rem 0 0;
  border-inline-start: 2px solid var(--line);
}

.page-about__timeline-item {
  position: relative;
  padding: 0 0 2.25rem 1.75rem;
}

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

.page-about__timeline-dot {
  position: absolute;
  top: .45rem;
  inset-inline-start: -7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 0 4px rgba(57, 255, 20, .14);
  transition: transform .4s ease, box-shadow .4s ease;
}

.page-about__timeline-card {
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--line);
  background: rgba(10, 25, 47, .5);
  transition: border-color .4s ease, background-color .4s ease, box-shadow .4s ease;
}

.page-about__timeline-card .leyu-code-tag {
  display: inline-block;
  margin-bottom: .5rem;
}

.page-about__timeline-card h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-frost);
}

.page-about__timeline-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--c-slate);
}

/* 滚动显现高亮 */
.page-about [data-reveal] {
  transition: transform .5s ease, border-color .5s ease, box-shadow .5s ease;
}

.page-about__timeline-item.leyu-reveal--active .page-about__timeline-card {
  border-color: var(--line-neon);
  background-color: rgba(16, 31, 56, .85);
  box-shadow: 0 0 24px rgba(57, 255, 20, .08);
}

.page-about__timeline-item.leyu-reveal--active .page-about__timeline-dot {
  transform: scale(1.35);
  box-shadow: 0 0 0 8px rgba(57, 255, 20, .18), 0 0 18px rgba(57, 255, 20, .5);
}

.page-about__timeline-figure {
  margin: 1.5rem 0 0;
  padding: .5rem;
  border: 1px solid var(--line);
  background: rgba(10, 25, 47, .4);
}

.page-about__timeline-figure img {
  width: 100%;
  border-radius: var(--radius);
}

/* 03 资质与荣誉 */
.page-about__awards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about__award {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(10, 25, 47, .9) 0%, rgba(13, 17, 23, .7) 100%);
  transition: border-color .3s ease, transform .3s ease, box-shadow .3s ease;
}

.page-about__award:hover {
  border-color: var(--line-neon);
  box-shadow: 0 12px 28px rgba(0, 0, 0, .35);
  transform: translateY(-4px);
}

.page-about__award-inner {
  text-align: center;
}

.page-about__award-seal {
  display: block;
  width: 74px;
  height: 74px;
  margin: 0 auto .75rem;
}

.page-about__award-inner .leyu-code-tag {
  display: inline-block;
}

.page-about__award-inner h3 {
  margin: .5rem 0 .15rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--c-frost);
  transform: skew(-3deg);
}

.page-about__award-title {
  margin: 0;
  font-size: var(--fs-caption);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--c-slate);
}

.page-about__award-detail {
  margin-top: auto;
  padding-top: .5rem;
  border-top: 1px solid var(--line);
}

.page-about__award-detail summary {
  display: flex;
  align-items: center;
  gap: .4rem;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-caption);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-neon);
}

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

.page-about__award-detail summary::before {
  content: "+";
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line-neon);
  border-radius: 50%;
  font-size: 1rem;
  line-height: 1;
  transition: transform .3s ease;
}

.page-about__award-detail[open] summary::before {
  transform: rotate(45deg);
}

.page-about__award-detail p {
  margin: .75rem 0 0;
  padding-inline-start: .75rem;
  border-inline-start: 2px solid var(--c-purple);
  font-size: .85rem;
  line-height: 1.7;
  color: var(--c-slate);
}

.page-about__awards-figure {
  margin: 2.25rem 0 0;
  padding: .5rem;
  border: 1px solid var(--line);
  background: rgba(10, 25, 47, .4);
}

.page-about__awards-figure img {
  width: 100%;
  max-height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about__awards-figure figcaption {
  padding: .6rem .4rem .2rem;
  font-size: var(--fs-caption);
  color: var(--c-slate);
}

/* 04 团队与组织 */
.page-about__team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about__team-card {
  position: relative;
  overflow: hidden;
  padding: 1.75rem 1.5rem 1.5rem;
  border: 1px solid var(--line);
  background: rgba(10, 25, 47, .45);
  transition: border-color .3s ease, background-color .3s ease, transform .3s ease;
}

.page-about__team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-progress);
  opacity: .6;
}

.page-about__team-card:hover {
  border-color: var(--line-purple);
  background-color: rgba(16, 31, 56, .75);
  transform: translateY(-3px);
}

.page-about__team-num {
  display: block;
  margin-bottom: .75rem;
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-purple);
}

.page-about__team-card h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--c-frost);
  transform: skew(-3deg);
}

.page-about__team-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--c-slate);
}

/* 05 合作生态 */
.page-about__partners-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about__partner-card h3 {
  margin: 1rem 0 .6rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 800;
  color: var(--c-ink);
  transform: skew(-3deg);
}

.page-about__partners-note {
  max-width: 68ch;
  margin: 2.5rem 0 0;
  padding-inline-start: 1rem;
  border-inline-start: 3px solid var(--c-purple);
  font-size: var(--fs-caption);
  color: var(--c-slate);
}

/* 延伸入口 */
.page-about__next {
  position: relative;
  overflow: hidden;
  border-block: 1px solid var(--line);
  background: var(--c-ink);
}

.page-about__next::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -8%;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(191, 0, 255, .25) 0%, transparent 70%);
  pointer-events: none;
}

.page-about__next-inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--ab-pad);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .5rem;
}

.page-about__next-inner .leyu-section-kicker {
  margin-bottom: 0;
}

.page-about__next-inner h2 {
  margin: 0 0 1.5rem;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 800;
  color: var(--c-frost);
  transform: skew(-4deg);
}

.page-about__next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .leyu-btn--outline {
  border-color: var(--line-purple);
  color: var(--c-frost);
}

.page-about .leyu-btn--outline:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

/* ===== 响应式 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    grid-template-columns: 1.1fr .9fr;
    min-height: 520px;
  }

  .page-about__section {
    grid-template-columns: 90px minmax(0, 1fr);
    gap: var(--ab-col-gap);
  }

  .page-about__section-index {
    display: block;
    padding-left: .75rem;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 2px solid var(--line-neon);
    font-size: 2.5rem;
    writing-mode: vertical-rl;
  }

  .page-about__section-index span {
    display: inline-block;
    margin-top: 1rem;
    letter-spacing: .45em;
  }

  .page-about__team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
  }
}

@media (min-width: 900px) {
  .page-about__story-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
    align-items: start;
  }

  .page-about__timeline-wrap {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
  }

  .page-about__awards-grid,
  .page-about__partners-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }
}