/* ============================================
   品牌档案 · page-about 页面专属样式
   ============================================ */

.page-about {
  --dot-size: 12px;
  --rail-x: 7px;
  --timeline-gap: clamp(2rem, 4vw, 3.25rem);
  background-color: var(--deep-blue);
  color: var(--light-gray);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */

.page-about .crumb {
  margin: 0;
  padding: 1.25rem 0 0;
}

/* ---------- 首屏档案头 ---------- */

.page-about__masthead {
  position: relative;
  padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(2rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--glass);
}

.page-about__masthead::after {
  content: "ARCHIVE";
  position: absolute;
  right: 0;
  bottom: clamp(1.25rem, 3vw, 2.5rem);
  z-index: 0;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: clamp(3.5rem, 11vw, 8.5rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.035);
}

.page-about__masthead > * {
  position: relative;
  z-index: 1;
}

.page-about__masthead-index {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.5rem;
  font-size: var(--font-caption);
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--electric-green);
}

.page-about__masthead-index::before {
  content: "";
  width: 2.25rem;
  height: 2px;
  background: var(--electric-green);
}

.page-about__masthead-title {
  margin: 0;
  max-width: 17ch;
  font-size: clamp(2.5rem, 6.5vw, 4.75rem);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about__masthead-title span {
  display: block;
  color: var(--electric-green);
}

.page-about__masthead-lead {
  max-width: 60ch;
  margin: 2rem 0 0;
  font-size: var(--font-body);
  line-height: var(--leading-body);
  color: var(--light-gray);
}

.page-about__masthead-lead strong {
  color: var(--white);
  font-weight: 500;
}

.page-about__masthead-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 880px;
  margin-top: 2.25rem;
  background: var(--glass);
  border: 1px solid var(--glass);
}

.page-about__masthead-meta > div {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  background: rgba(10, 25, 47, 0.85);
}

.page-about__masthead-meta dt {
  font-family: var(--font-mono);
  font-size: var(--font-caption);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(230, 237, 245, 0.55);
}

.page-about__masthead-meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--electric-green);
}

.page-about__masthead-status {
  display: inline-flex;
  margin-top: 1.5rem;
}

@media (min-width: 700px) {
  .page-about__masthead-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 外壳：目录 + 内容 ---------- */

.page-about__shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about__content {
  min-width: 0;
}

/* 目录（移动端为横向索引条） */

.page-about__toc {
  margin: 0;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--glass);
}

.page-about__toc-title {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--font-caption);
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about__toc ol {
  display: flex;
  gap: 0.625rem;
  margin: 0;
  padding: 0 0 0.25rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about__toc a {
  display: block;
  white-space: nowrap;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--glass);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
  color: var(--light-gray);
  text-decoration: none;
  font-size: 0.8125rem;
  transition: color 0.3s var(--ease-out), border-color 0.3s var(--ease-out), background 0.3s var(--ease-out);
}

.page-about__toc a:hover,
.page-about__toc a.is-spy-active {
  border-color: var(--electric-green);
  color: var(--electric-green);
  background: rgba(57, 255, 20, 0.06);
}

.page-about__toc-foot {
  margin: 0.75rem 0 0;
  font-size: var(--font-caption);
  letter-spacing: 0.1em;
  color: rgba(230, 237, 245, 0.5);
}

/* ---------- 区块通用 ---------- */

.page-about__section {
  position: relative;
  padding: clamp(3rem, 7vw, 6rem) 0;
}

.page-about__section--plate {
  margin: 0;
  padding: clamp(1.75rem, 4vw, 3.5rem);
  background-color: var(--midnight-blue);
  background-image:
    linear-gradient(rgba(57, 255, 20, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.04) 1px, transparent 1px);
  background-size: 34px 34px;
  border: 1px solid var(--glass);
  border-radius: var(--radius);
}

.page-about__section-head {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--glass);
}

.page-about__section-no {
  flex-shrink: 0;
  padding-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 300;
  line-height: 1;
  color: rgba(57, 255, 20, 0.4);
}

.page-about__section-caption {
  margin: 0.35rem 0 0.5rem;
  font-size: var(--font-caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--electric-green);
}

.page-about__section-title {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .lead {
  max-width: 64ch;
  color: var(--light-gray);
}

.page-about figure {
  margin: 0;
}

.page-about .img-frame {
  border: 1px solid var(--glass);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--slate);
}

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

.page-about .media-index {
  margin-top: 0.75rem;
  font-size: var(--font-caption);
  letter-spacing: 0.06em;
  color: rgba(230, 237, 245, 0.55);
}

/* ---------- 品牌定位 ---------- */

.page-about__positioning {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  align-items: center;
}

.page-about__positioning-copy p {
  margin: 0 0 1.25rem;
  line-height: var(--leading-body);
  color: var(--light-gray);
}

.page-about__positioning-list {
  display: grid;
  gap: 0.875rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about__positioning-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9375rem;
  line-height: 1.65;
}

.page-about__positioning-list .status-dot {
  flex-shrink: 0;
  margin-top: 0.5rem;
}

@media (min-width: 900px) {
  .page-about__positioning {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 5rem);
  }
}

/* ---------- 数据能力信号板 ---------- */

.page-about__signal-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.875rem;
}

.page-about__signal {
  position: relative;
  padding: 1.5rem 1.25rem;
  overflow: hidden;
  border: 1px solid var(--glass);
  border-radius: var(--radius);
  background: rgba(10, 25, 47, 0.72);
  transition: transform 0.35s var(--ease-out), border-color 0.35s var(--ease-out);
}

.page-about__signal::after {
  content: "";
  position: absolute;
  right: -1.25rem;
  top: -1.25rem;
  width: 4.5rem;
  height: 4.5rem;
  border-radius: 50%;
  background: rgba(57, 255, 20, 0.06);
  pointer-events: none;
}

.page-about__signal:hover {
  transform: translateY(-3px);
  border-color: rgba(57, 255, 20, 0.5);
}

.page-about__signal-no {
  display: block;
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
  font-size: var(--font-caption);
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about__signal .data-num {
  display: block;
  margin-bottom: 0.75rem;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.1;
  color: var(--electric-green);
}

.page-about__signal h3 {
  margin: 0 0 0.5rem;
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--white);
}

.page-about__signal p:last-child {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: rgba(230, 237, 245, 0.82);
}

@media (min-width: 700px) {
  .page-about__signal-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about__signal-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 数据能力清单 ---------- */

.page-about__capability {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  margin-top: clamp(2rem, 4vw, 3.5rem);
}

.page-about__capability-figure {
  max-width: 300px;
  margin-inline: auto;
}

.page-about__capability-title {
  margin: 0 0 1.25rem;
  font-size: 1.375rem;
  font-weight: 300;
  color: var(--white);
}

.page-about__capability-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--glass);
}

.page-about__capability-list li {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--glass);
}

.page-about__capability-list .mono {
  font-size: var(--font-data);
  line-height: 1.7;
  color: var(--orange);
}

.page-about__capability-list h4 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--white);
}

.page-about__capability-list p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: rgba(230, 237, 245, 0.82);
}

@media (min-width: 900px) {
  .page-about__capability {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }

  .page-about__capability-figure {
    margin-inline: 0;
  }
}

/* ---------- 团队与组织 ---------- */

.page-about__team-lead {
  margin: 0 0 2rem;
}

.page-about__team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.875rem;
}

.page-about__team-card {
  padding: 1.5rem 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(6px);
  transition: border-color 0.35s var(--ease-out), background 0.35s var(--ease-out);
}

.page-about__team-card:hover {
  border-color: rgba(57, 255, 20, 0.45);
  background: rgba(255, 255, 255, 0.13);
}

.page-about__team-count {
  margin: 0 0 1.25rem;
  font-size: var(--font-data);
  letter-spacing: 0.08em;
  color: var(--electric-green);
}

.page-about__team-card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--white);
}

.page-about__team-card p:last-child {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: rgba(230, 237, 245, 0.82);
}

.page-about__team-figure {
  margin-top: 2rem;
}

@media (min-width: 760px) {
  .page-about__team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about__team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 发展里程碑时间线 ---------- */

.page-about__milestones-lead {
  margin: 0 0 3rem;
}

.page-about__timeline-list {
  position: relative;
  display: grid;
  justify-items: start;
  gap: 2.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about__timeline-list::before {
  content: "";
  position: absolute;
  left: calc(var(--rail-x) - 1px);
  top: 0.3rem;
  bottom: 0.3rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--electric-green), rgba(57, 255, 20, 0.15));
  opacity: 0.75;
}

.page-about__timeline-item {
  position: relative;
  width: 100%;
  padding-left: 2.5rem;
  transition: transform 0.35s var(--ease-out);
}

.page-about__timeline-item:hover {
  transform: translateY(-2px);
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: calc(var(--rail-x) - var(--dot-size) / 2);
  top: 0.3rem;
  width: var(--dot-size);
  height: var(--dot-size);
  border-radius: 50%;
  background: var(--deep-blue);
  border: 2px solid var(--electric-green);
  box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.4);
  transition: box-shadow 0.35s var(--ease-out), background 0.35s var(--ease-out);
}

.page-about__timeline-item::after {
  content: "";
  position: absolute;
  left: var(--rail-x);
  top: calc(0.3rem + var(--dot-size) / 2 - 0.5px);
  width: calc(2.5rem - var(--rail-x));
  height: 1px;
  background: rgba(57, 255, 20, 0.35);
}

.page-about__timeline-item:hover::before,
.page-about__timeline-item:focus-within::before {
  background: var(--electric-green);
  box-shadow: 0 0 18px 2px rgba(57, 255, 20, 0.55);
}

.page-about__timeline-year {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--electric-green);
}

.page-about__timeline-item h3 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--white);
}

.page-about__timeline-item p:last-child {
  max-width: 52ch;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(230, 237, 245, 0.82);
}

.page-about__timeline-item--now::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 16px 2px rgba(255, 107, 53, 0.5);
}

.page-about__timeline-item--now:hover::before,
.page-about__timeline-item--now:focus-within::before {
  background: var(--orange);
  box-shadow: 0 0 22px 4px rgba(255, 107, 53, 0.65);
}

.page-about__timeline-item--now .page-about__timeline-year {
  color: var(--orange);
}

/* ---------- 资质与认可 ---------- */

.page-about__recognition-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about__honor {
  position: relative;
  padding: 2rem 1.75rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about__honor::before {
  content: "";
  position: absolute;
  inset: 0;
  border-top: 2px solid var(--electric-green);
  border-radius: var(--radius) var(--radius) 0 0;
  pointer-events: none;
}

.page-about__honor .caption {
  display: block;
  margin: 0 0 1rem;
  font-size: var(--font-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--electric-green);
}

.page-about__honor h3 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.375rem, 3vw, 1.75rem);
  font-weight: 300;
  line-height: 1.3;
  color: var(--white);
}

.page-about__honor p:last-child {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(230, 237, 245, 0.82);
}

.page-about__honor-side {
  padding: 1.5rem 1.5rem 1.75rem;
  border: 1px solid var(--glass);
  border-radius: var(--radius);
  background: rgba(10, 25, 47, 0.6);
}

.page-about__honor-side h3 {
  margin: 0 0 1.25rem;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--white);
}

.page-about__honor-side ul {
  display: grid;
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about__honor-side li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: rgba(230, 237, 245, 0.88);
}

.page-about__honor-side li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 0.8rem;
  height: 0.8rem;
  background: rgba(57, 255, 20, 0.14);
  border: 1px solid var(--electric-green);
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0, 43% 62%);
}

.page-about__trust-note {
  margin: 2.5rem 0 0;
  padding: 2rem 1.75rem;
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(135deg, rgba(17, 34, 64, 0.92), rgba(10, 25, 47, 0.92));
}

.page-about__trust-note p {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--light-gray);
}

.page-about__trust-note footer {
  font-family: var(--font-mono);
  font-size: var(--font-caption);
  letter-spacing: 0.12em;
  color: var(--orange);
}

@media (min-width: 900px) {
  .page-about__recognition-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 3rem);
    align-items: stretch;
  }
}

/* ---------- 继续探索 ---------- */

.page-about__explore {
  display: grid;
  gap: 1.5rem;
  margin-top: clamp(3rem, 6vw, 5rem);
  padding: 2.5rem 0;
  border-top: 1px solid var(--glass);
}

.page-about__explore-title {
  margin: 0;
  font-size: var(--font-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--electric-green);
}

.page-about__explore-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  align-items: center;
}

/* ---------- 桌面端布局：固定目录 + 交错时间线 ---------- */

@media (min-width: 1024px) {
  .page-about__shell {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4.5rem);
    align-items: start;
  }

  .page-about__toc {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    padding: 0;
    border: 0;
  }

  .page-about__toc ol {
    display: grid;
    gap: 0;
    overflow: visible;
  }

  .page-about__toc a {
    padding: 0.65rem 0 0.65rem 1.1rem;
    border: 0;
    border-left: 2px solid var(--glass);
    border-radius: 0;
    background: transparent;
    white-space: normal;
  }

  .page-about__toc a:hover,
  .page-about__toc a.is-spy-active {
    border-left-color: var(--electric-green);
    background: transparent;
    color: var(--electric-green);
  }

  .page-about__timeline-list::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__timeline-item {
    width: calc(50% - var(--timeline-gap));
    padding-left: 0;
  }

  .page-about__timeline-item:nth-child(odd) {
    justify-self: start;
    text-align: right;
  }

  .page-about__timeline-item:nth-child(even) {
    justify-self: end;
    text-align: left;
  }

  .page-about__timeline-item::before {
    left: auto;
    right: calc(-1 * var(--timeline-gap) - var(--dot-size) / 2);
    top: 0.2rem;
  }

  .page-about__timeline-item:nth-child(even)::before {
    right: auto;
    left: calc(-1 * var(--timeline-gap) - var(--dot-size) / 2);
  }

  .page-about__timeline-item::after {
    left: auto;
    right: calc(-1 * var(--timeline-gap));
    top: calc(0.2rem + var(--dot-size) / 2 - 0.5px);
    width: var(--timeline-gap);
  }

  .page-about__timeline-item:nth-child(even)::after {
    right: auto;
    left: calc(-1 * var(--timeline-gap));
  }

  .page-about__timeline-item p:last-child {
    max-width: 46ch;
  }

  .page-about__timeline-item:nth-child(odd) p:last-child,
  .page-about__timeline-item:nth-child(odd) h3,
  .page-about__timeline-item:nth-child(odd) .page-about__timeline-year {
    margin-left: auto;
  }
}