.page-about {
  --about-navy: var(--color-primary);
  --about-neon: var(--color-accent);
  --about-orange: var(--color-accent-alt);
  --about-light: var(--color-bg-light);
  --about-muted: var(--color-text-muted);
  background: var(--color-bg-light);
  color: var(--color-text-dark);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

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

.about-breadcrumb {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 16px var(--container-pad) 0;
  font-size: 12px;
  color: var(--color-text-muted);
}

.about-breadcrumb .site-breadcrumb__link {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.about-breadcrumb .site-breadcrumb__link:hover,
.about-breadcrumb .site-breadcrumb__link:focus-visible {
  color: var(--color-accent-alt);
}

.about-breadcrumb .site-breadcrumb__current {
  color: var(--color-text-dark);
  font-weight: 700;
}

/* ---------- Hero 品牌叙事 ---------- */
.about-hero {
  position: relative;
  padding: 8px var(--container-pad) 56px;
  background-color: var(--color-primary);
  background-image:
    linear-gradient(rgba(57, 255, 20, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  overflow: hidden;
}

.about-hero__frame {
  position: relative;
  max-width: var(--container-max);
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(10, 31, 68, 0.86);
  padding: 36px 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.about-hero__frame::before,
.about-hero__frame::after {
  content: "";
  position: absolute;
  width: 28px;
  height: 28px;
  border-color: var(--color-accent);
  border-style: solid;
  pointer-events: none;
  z-index: 2;
}

.about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-width: 3px 0 0 3px;
}

.about-hero__frame::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 3px 3px 0;
}

.about-hero__decor {
  display: none;
}

.about-hero__content .eyebrow {
  color: var(--color-accent);
  letter-spacing: 0.18em;
  margin-bottom: 8px;
}

.about-hero__content h1 {
  font-family: var(--font-title);
  font-size: clamp(40px, 8vw, 76px);
  line-height: 0.96;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  color: var(--color-bg-light);
  margin: 0 0 10px;
}

.about-hero__sub {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent-alt);
  margin: 0 0 16px;
}

.about-hero__lead {
  max-width: 56ch;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.78);
  margin: 0 0 20px;
}

.about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.about-hero__meta span {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  padding: 4px 12px;
  letter-spacing: 0.04em;
}

.about-hero__figure {
  margin: 0;
}

.about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.14);
}

/* ---------- Concept 理念区 ---------- */
.about-concept {
  padding: 64px 0 56px;
  background: var(--color-bg-light);
}

.about-section-head {
  max-width: var(--container-max);
  margin: 0 auto 40px;
  padding: 0 var(--container-pad);
}

.about-section-head h2 {
  font-family: var(--font-title);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.08;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 8px 0 10px;
}

.about-section-head p:not(.eyebrow) {
  color: var(--color-text-muted);
  font-size: 14px;
  max-width: 48ch;
}

.about-section-head .eyebrow {
  color: var(--color-accent-alt);
  font-size: 12px;
  letter-spacing: 0.16em;
  font-weight: 700;
}

.about-concept__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.about-concept__card {
  position: relative;
  background: #fff;
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  padding: 28px 24px 24px;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.about-concept__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(10, 31, 68, 0.12);
  border-color: var(--color-primary);
}

.about-concept__num {
  position: absolute;
  top: 16px;
  right: 18px;
  font-family: var(--font-title);
  font-size: 28px;
  color: var(--color-border);
}

.about-concept__card h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 10px;
  padding-right: 40px;
  color: var(--color-text-dark);
}

.about-concept__card p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ---------- Milestones 时间线 ---------- */
.about-milestones {
  position: relative;
  padding: 72px 0 56px;
  background: var(--color-primary);
  color: #fff;
}

.about-milestones::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-alt));
}

.about-section-head--light h2 {
  color: var(--color-bg-light);
}

.about-section-head--light p:not(.eyebrow) {
  color: rgba(255, 255, 255, 0.68);
}

.about-timeline {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 0 8px;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--color-accent) 0%,
    rgba(57, 255, 20, 0.5) 45%,
    var(--color-accent-alt) 100%
  );
}

.about-timeline__item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 40px;
}

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

.about-timeline__meta {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 48px;
  text-align: center;
}

.about-timeline__dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent-alt);
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-accent);
  margin-bottom: 10px;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.about-timeline__year {
  font-family: var(--font-title);
  font-size: 22px;
  line-height: 1;
  color: var(--color-accent);
}

.about-timeline__version {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-alt);
  margin-top: 4px;
}

.about-timeline__card {
  background: rgba(255, 255, 255, 0.07);
  border-left: 3px solid var(--color-accent-alt);
  border-radius: 0 10px 10px 0;
  padding: 20px 20px;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.about-timeline__card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
  color: #fff;
  line-height: 1.4;
}

.about-timeline__card p {
  margin: 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.8;
}

.about-timeline__item:hover .about-timeline__card {
  background: rgba(255, 255, 255, 0.13);
  border-color: var(--color-accent);
  transform: translateX(4px);
}

.about-timeline__item:hover .about-timeline__dot {
  background: var(--color-accent);
  transform: scale(1.18);
}

.about-versions {
  max-width: 960px;
  margin: 48px auto 0;
  padding: 0 var(--container-pad);
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.about-versions__label {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.66);
  margin: 0;
}

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

.about-versions__chip {
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-body);
  color: #fff;
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  padding: 6px 16px;
  letter-spacing: 0.03em;
}

/* ---------- Status 数据带 ---------- */
.about-status {
  padding: 56px 0;
  background: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
}

.about-status__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.about-status__stat {
  background: var(--color-data-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 20px 16px;
  text-align: center;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.about-status__stat:hover {
  border-color: var(--color-accent);
  background: #fff;
}

.about-status__num {
  display: block;
  font-family: var(--font-title);
  font-size: 32px;
  line-height: 1;
  color: var(--color-primary);
  letter-spacing: 0.01em;
}

.about-status__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 8px;
}

.about-status__note {
  max-width: var(--container-max);
  margin: 24px auto 0;
  padding: 0 var(--container-pad);
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ---------- Tech 技术能力 ---------- */
.about-tech {
  padding: 64px 0 56px;
  background: var(--color-bg-light);
}

.about-tech__grid {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.about-tech__content h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--color-text-dark);
}

.about-tech__pipeline {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  counter-reset: pipe;
}

.about-tech__pipeline li {
  position: relative;
  padding: 12px 0 12px 44px;
  border-bottom: 1px dashed var(--color-border);
  font-size: 14px;
  color: var(--color-text-dark);
  counter-increment: pipe;
}

.about-tech__pipeline li:last-child {
  border-bottom: 0;
}

.about-tech__pipeline li::before {
  content: counter(pipe, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  background: var(--color-primary);
  color: var(--color-accent);
  border-radius: 50%;
}

.about-tech__pipeline li span {
  display: inline-block;
  min-width: 64px;
  font-weight: 700;
  color: var(--color-accent-alt);
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 0.06em;
  margin-right: 8px;
}

.about-tech__note {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
  border-left: 3px solid var(--color-accent);
  padding-left: 14px;
  margin: 16px 0 0;
}

.about-tech__figure {
  margin: 0;
}

.about-tech__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--color-border);
}

/* ---------- Credentials 资质荣誉 ---------- */
.about-credentials {
  position: relative;
  padding: 72px 0 64px;
  background: var(--color-primary);
  color: #fff;
}

.about-credentials::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-alt), var(--color-accent));
}

.about-credentials__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.about-cred {
  position: relative;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-left: 4px solid var(--color-accent-alt);
  padding: 28px 24px;
  overflow: hidden;
  transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.about-cred::before {
  content: "";
  position: absolute;
  right: -20px;
  top: -20px;
  width: 80px;
  height: 80px;
  background: var(--color-accent);
  opacity: 0.12;
  border-radius: 50%;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.about-cred:hover {
  border-left-color: var(--color-accent);
  background: rgba(255, 255, 255, 0.13);
  transform: translateY(-4px);
}

.about-cred:hover::before {
  opacity: 0.26;
  transform: scale(1.3);
}

.about-cred__num {
  display: block;
  font-family: var(--font-title);
  font-size: 44px;
  line-height: 1;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.about-cred__badge {
  display: inline-block;
  font-family: var(--font-title);
  font-size: 26px;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
  padding: 6px 14px;
  margin-bottom: 14px;
  border-radius: 4px;
}

.about-cred h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 10px;
  color: #fff;
  line-height: 1.4;
}

.about-cred p {
  margin: 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

/* ---------- Team 团队与生态 ---------- */
.about-team {
  padding: 64px 0 56px;
  background: var(--color-bg-light);
}

.about-team__grid {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.about-team__lead {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-dark);
  margin: 0 0 20px;
  line-height: 1.8;
}

.about-team__roles {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}

.about-team__roles li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.about-team__roles li:last-child {
  border-bottom: 0;
}

.about-team__roles strong {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 15px;
}

.about-team__roles span {
  color: var(--color-text-muted);
  line-height: 1.6;
}

.about-team__partners {
  margin: 16px 0 0;
  padding: 16px 18px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.about-team__figure {
  margin: 0;
}

.about-team__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--color-border);
}

/* ---------- Next 引导区 ---------- */
.about-next {
  padding: 24px 0 72px;
  background: var(--color-bg-light);
}

.about-next__inner {
  position: relative;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 56px var(--container-pad);
  background:
    linear-gradient(rgba(57, 255, 20, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.06) 1px, transparent 1px),
    var(--color-primary);
  background-size: 32px 32px, 32px 32px, auto;
  color: #fff;
  overflow: hidden;
}

.about-next__inner::after {
  content: "BW // DATA POD";
  position: absolute;
  right: 16px;
  bottom: 12px;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.26);
}

.about-next__inner .eyebrow {
  color: var(--color-accent);
  letter-spacing: 0.16em;
}

.about-next__inner h2 {
  font-family: var(--font-title);
  font-size: clamp(28px, 4vw, 40px);
  text-transform: uppercase;
  color: var(--color-bg-light);
  margin: 8px 0 12px;
}

.about-next__inner > p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  max-width: 44ch;
  margin: 0 0 28px;
}

.about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .btn--ghost {
  border-color: rgba(255, 255, 255, 0.46);
  color: #fff;
  background: transparent;
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---------- 平板端 ---------- */
@media (min-width: 640px) {
  .about-hero {
    padding-left: var(--container-pad);
    padding-right: var(--container-pad);
  }

  .about-hero__frame {
    padding: 44px 40px;
  }

  .about-hero__meta {
    gap: 12px;
  }

  .about-concept__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-concept__card {
    padding: 32px 24px 26px;
  }

  .about-status__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-credentials__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-tech__grid,
  .about-team__grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .about-team__copy {
    order: 1;
  }

  .about-team__figure {
    order: 2;
  }

  .about-timeline__card {
    padding: 24px 28px;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 1080px) {
  .about-hero {
    padding-top: 0;
  }

  .about-hero__frame {
    flex-direction: row;
    align-items: center;
    gap: 48px;
    padding: 56px 64px 56px 84px;
  }

  .about-hero__content {
    flex: 0 0 42%;
  }

  .about-hero__figure {
    flex: 0 0 58%;
  }

  .about-hero__decor {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    position: absolute;
    left: 32px;
    top: 0;
    bottom: 0;
    width: 20px;
    padding: 16px 0;
    border-left: 1px solid rgba(255, 255, 255, 0.2);
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 10px;
    font-family: var(--font-body);
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.12em;
  }

  .about-hero__decor span:first-child {
    font-weight: 700;
    color: var(--color-accent);
  }

  .about-status__grid {
    grid-template-columns: repeat(5, 1fr);
  }

  /* 时间线左右交替 */
  .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .about-timeline__item {
    width: 50%;
    padding-left: 0;
    padding-right: 52px;
    margin-bottom: 48px;
    text-align: right;
  }

  .about-timeline__item:nth-child(even) {
    margin-left: 50%;
    padding-left: 52px;
    padding-right: 0;
    text-align: left;
  }

  .about-timeline__meta {
    width: auto;
    left: auto;
    right: -28px;
    top: 8px;
  }

  .about-timeline__item:nth-child(even) .about-timeline__meta {
    left: -28px;
    right: auto;
  }

  .about-timeline__dot {
    width: 20px;
    height: 20px;
    margin-bottom: 10px;
  }

  .about-timeline__card {
    border-left: 0;
    border-right: 3px solid var(--color-accent-alt);
    border-radius: 10px 0 0 10px;
    text-align: left;
  }

  .about-timeline__item:nth-child(even) .about-timeline__card {
    border-left: 3px solid var(--color-accent-alt);
    border-right: 0;
    border-radius: 0 10px 10px 0;
  }

  .about-timeline__item:hover .about-timeline__card {
    transform: translateX(-4px);
  }

  .about-timeline__item:nth-child(even):hover .about-timeline__card {
    transform: translateX(4px);
  }
}