/* ===== 当前页面专属 CSS：page-about ===== */
.page-about {
  position: relative;
  background:
    radial-gradient(ellipse at 82% 6%, rgba(157, 0, 255, 0.14) 0%, transparent 48%),
    radial-gradient(ellipse at 8% 22%, rgba(0, 229, 255, 0.1) 0%, transparent 44%),
    linear-gradient(180deg, #081527 0%, #0B1D3A 45%, #071224 100%);
  color: var(--text-primary);
  font-family: var(--font-body);
  overflow: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-heading);
}

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

/* ===== Hero 区块 ===== */
.about-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid rgba(0, 229, 255, 0.25);
}

.about-hero__content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.about-hero .eyebrow {
  color: var(--accent-blue);
}

.about-hero h1 {
  margin: 0.5rem 0 0.6rem;
  font-size: clamp(2.2rem, 6.2vw, 3.9rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.about-hero__lead {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.02rem;
  max-width: 56ch;
  margin: 0 0 1.5rem;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.about-hero__stat {
  position: relative;
  z-index: 0;
  text-align: right;
  margin-top: 0.5rem;
  pointer-events: none;
  user-select: none;
  opacity: 0.95;
}

.about-hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(3.2rem, 10vw, 6.4rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(57, 255, 20, 0.55);
  text-shadow: 0 0 28px rgba(57, 255, 20, 0.25);
}

.about-hero__stat-desc {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

@media (min-width: 768px) {
  .about-hero {
    grid-template-columns: 1fr 240px;
    align-items: center;
    padding: 5rem 0 4rem;
  }

  .about-hero__stat {
    grid-column: 2;
    grid-row: 1;
    margin-top: 0;
  }
}

/* ===== 布局：档案索引 + 主内容 ===== */
.about-layout {
  display: block;
}

.about-main {
  min-width: 0;
}

/* ===== 侧边档案索引 ===== */
.about-index {
  position: static;
  z-index: 2;
  padding: 1.4rem 1.2rem;
  margin-bottom: 2rem;
  background: rgba(13, 28, 52, 0.86);
  border: 1px solid rgba(0, 229, 255, 0.22);
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.08);
}

.about-index__eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 0.6rem;
}

.about-index__list {
  list-style: none;
  margin: 0.5rem 0 1.25rem;
  padding: 0;
}

.about-index__list a {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.7rem 0.2rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.about-index__list a:hover,
.about-index__list a:focus-visible {
  color: var(--accent-blue);
  padding-left: 0.4rem;
}

.about-index__list a span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-green);
}

.about-index__fact {
  padding-top: 1rem;
  margin-top: 1rem;
  border-top: 1px solid rgba(0, 229, 255, 0.25);
}

.about-index__fact-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.about-index__fact-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.3rem 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}

.about-index__fact-row .stat {
  font-size: 1rem;
}

.about-index__fact-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.about-index__cta {
  margin-top: 1.25rem;
  width: 100%;
  text-align: center;
}

@media (min-width: 1024px) {
  .about-layout {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .about-index {
    position: sticky;
    top: 7rem;
    margin-bottom: 0;
  }
}

/* ===== 章节通用表头 ===== */
.about-section {
  padding: 3.5rem 0;
  scroll-margin-top: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.about-section:first-of-type {
  padding-top: 1.5rem;
}

.about-section__head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.about-section__num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--accent-green);
  color: var(--accent-green);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.2);
  flex: 0 0 auto;
}

.about-section__heading h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin: 0;
}

/* ===== 品牌故事 ===== */
.about-story {
  display: grid;
  gap: 1.75rem;
}

.about-story__content p {
  color: var(--text-secondary);
  line-height: 1.9;
  margin: 0 0 1em;
}

.about-story__checklist {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: 1px solid rgba(0, 229, 255, 0.2);
}

.about-story__checklist li {
  position: relative;
  padding: 0.75rem 0 0.75rem 1.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

.about-story__checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.7);
  transform: rotate(45deg);
}

.about-story__figure {
  margin: 0;
}

.about-story__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid rgba(0, 229, 255, 0.3);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

@media (min-width: 768px) {
  .about-story {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: center;
  }
}

/* ===== 发展里程碑：时间线 ===== */
.about-milestone__hero {
  margin: 1rem 0 0;
}

.about-milestone__hero img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 5;
  object-fit: cover;
  border: 1px solid rgba(0, 229, 255, 0.18);
}

.about-timeline {
  position: relative;
  list-style: none;
  margin: 2rem 0 0;
  padding: 0 0 0 1.8rem;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-green) 0%, var(--accent-blue) 60%, var(--accent-purple) 100%);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.4);
}

.about-timeline__item {
  position: relative;
  margin-bottom: 2.2rem;
}

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

.about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.8rem;
  top: 0.35rem;
  width: 10px;
  height: 10px;
  margin-left: -4px;
  background: var(--bg-primary);
  border: 2px solid var(--accent-green);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.7);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.about-timeline__item:hover::before {
  background: var(--accent-green);
  border-color: var(--accent-blue);
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.9);
}

.about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-green);
  margin-right: 0.6rem;
}

.about-timeline__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue);
  padding: 0.1rem 0.45rem;
  letter-spacing: 0.06em;
}

.about-timeline__body {
  margin-top: 0.45rem;
  padding: 1.1rem 1.2rem;
  background: rgba(26, 58, 92, 0.5);
  border-left: 2px solid var(--accent-blue);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.about-timeline__item:hover .about-timeline__body {
  transform: translateX(6px);
  border-left-color: var(--accent-green);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
}

.about-timeline__body h3 {
  font-size: 1.15rem;
  margin: 0 0 0.4rem;
}

.about-timeline__body p {
  color: var(--text-secondary);
  line-height: 1.75;
  margin: 0;
  font-size: 0.94rem;
}

/* 时间线滚动渐显级联 */
.js-reveal .page-about #milestones[data-reveal] .about-timeline__item {
  opacity: 0;
  transform: translateY(18px);
}

.js-reveal .page-about #milestones[data-reveal][data-revealed] .about-timeline__item {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.js-reveal .page-about #milestones[data-reveal][data-revealed] .about-timeline__item:nth-child(1) { transition-delay: 0s; }
.js-reveal .page-about #milestones[data-reveal][data-revealed] .about-timeline__item:nth-child(2) { transition-delay: 0.07s; }
.js-reveal .page-about #milestones[data-reveal][data-revealed] .about-timeline__item:nth-child(3) { transition-delay: 0.14s; }
.js-reveal .page-about #milestones[data-reveal][data-revealed] .about-timeline__item:nth-child(4) { transition-delay: 0.21s; }
.js-reveal .page-about #milestones[data-reveal][data-revealed] .about-timeline__item:nth-child(5) { transition-delay: 0.28s; }
.js-reveal .page-about #milestones[data-reveal][data-revealed] .about-timeline__item:nth-child(6) { transition-delay: 0.35s; }
.js-reveal .page-about #milestones[data-reveal][data-revealed] .about-timeline__item:nth-child(7) { transition-delay: 0.42s; }

/* ===== 团队与规模 ===== */
.page-about #team-scale {
  background: radial-gradient(ellipse at 95% 40%, rgba(0, 229, 255, 0.08) 0%, transparent 45%);
}

.about-team__intro {
  color: var(--text-secondary);
  line-height: 1.9;
  max-width: 72ch;
  margin-bottom: 1.75rem;
}

.about-team__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.about-stat-card {
  position: relative;
  padding: 1.6rem 1rem;
  background: var(--bg-card);
  border: 1px solid rgba(0, 229, 255, 0.2);
  text-align: center;
  overflow: hidden;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.about-stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-green);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.12);
}

.about-stat-card::after {
  content: "";
  position: absolute;
  right: -8px;
  bottom: -8px;
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, transparent 50%, var(--accent-orange) 50%);
}

.about-stat-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--accent-green);
  text-shadow: 0 0 16px rgba(57, 255, 20, 0.35);
}

.about-stat-card__label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.about-team__note {
  color: var(--text-secondary);
  line-height: 1.9;
  font-size: 0.96rem;
  border-left: 3px solid var(--accent-blue);
  padding-left: 1rem;
  margin-top: 1.5rem;
}

.about-team__note p {
  margin: 0;
}

@media (min-width: 768px) {
  .about-team__stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== 合作与生态 ===== */
.page-about #ecosystem {
  background: radial-gradient(ellipse at 85% 60%, rgba(157, 0, 255, 0.1) 0%, transparent 55%);
}

.about-eco__intro {
  color: var(--text-secondary);
  line-height: 1.9;
  max-width: 72ch;
  margin-bottom: 1.5rem;
}

.about-eco__intro p {
  margin: 0;
}

.about-eco__figure {
  margin: 0 0 1.75rem;
}

.about-eco__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid rgba(157, 0, 255, 0.3);
}

.about-eco__points {
  display: grid;
  gap: 1rem;
}

.about-eco__card {
  padding: 1.4rem 1.2rem;
  background: rgba(26, 58, 92, 0.52);
  border-top: 2px solid var(--accent-blue);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.about-eco__card:hover {
  background: rgba(26, 58, 92, 0.8);
  border-color: var(--accent-green);
}

.about-eco__icon {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-green);
  border: 1px solid rgba(57, 255, 20, 0.5);
  padding: 0.3rem 0.7rem;
  margin-bottom: 0.8rem;
  box-shadow: 0 0 14px rgba(57, 255, 20, 0.18);
}

.about-eco__card h3 {
  font-size: 1.15rem;
  margin: 0 0 0.45rem;
}

.about-eco__card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  margin: 0;
}

@media (min-width: 768px) {
  .about-eco__points {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 资质与荣誉 ===== */
.about-qual__list {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.about-qual__item {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem 1rem;
  padding: 1.4rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-left: 3px solid var(--accent-green);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.about-qual__item:hover {
  background: rgba(26, 58, 92, 0.8);
  border-left-color: var(--accent-orange);
}

.about-qual__badge {
  grid-row: span 2;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-orange);
  border: 1px solid rgba(255, 107, 0, 0.4);
  padding: 0.25rem 0.55rem;
  background: rgba(255, 107, 0, 0.1);
}

.about-qual__item h3 {
  margin: 0;
  font-size: 1.1rem;
}

.about-qual__item p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.75;
  font-size: 0.92rem;
}

@media (min-width: 768px) {
  .about-qual__list {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== 文末行动号召 ===== */
.about-cta {
  position: relative;
  margin: 3.5rem 0 0;
  padding: 2.4rem 1.5rem;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(255, 107, 0, 0.16) 0%, transparent 60%),
    var(--bg-secondary);
  border: 1px solid rgba(255, 107, 0, 0.25);
  overflow: hidden;
}

.about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-orange), var(--accent-blue), var(--accent-green));
}

.about-cta .eyebrow {
  color: var(--accent-orange);
}

.about-cta h2 {
  margin: 0.5em 0 0.3em;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.about-cta p {
  color: var(--text-secondary);
  margin-bottom: 1.6rem;
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
}