/* ===== 页面专用样式：page-about ===== */
.page-about {
  --about-bg-1: #0A1F44;
  --about-bg-2: #0E2A5A;
  --about-bg-3: #12356E;
  --about-accent: #00E676;
  --about-hot: #FF6D00;
  --about-hot-2: #FF9E00;
  --about-text: #F5F7FA;
  --about-muted: #B0BEC5;
  --about-border: 3px solid rgba(0, 230, 118, 0.7);
  --about-shadow: 8px 8px 0 rgba(0, 0, 0, 0.25);
  color-scheme: dark;
  background-color: var(--about-bg-1);
  color: var(--about-text);
  font-family: var(--font-body, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif);
  position: relative;
  overflow-x: hidden;
  line-height: 1.75;
}

/* ---- 布局骨架 ---- */
.page-about .about-main {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-block {
  padding: 3.5rem 0 2rem;
  position: relative;
  scroll-margin-top: 4.5rem;
}

.page-about .about-block + .about-block {
  border-top: 1px solid rgba(176, 190, 197, 0.25);
}

.page-about .about-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.25rem;
}

.page-about .about-head .kicker,
.page-about .rail-label,
.page-about .stamp-year,
.page-about .svg-coord-note {
  font-family: var(--font-mono, "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about .about-head .kicker {
  color: var(--about-accent);
  font-size: 0.75rem;
  font-weight: 500;
}

.page-about .about-head .section-title {
  font-size: 1.9rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.25;
  position: relative;
  padding-left: 1rem;
  border-left: var(--about-border);
  margin: 0.5rem 0 1.25rem;
}

.page-about .mono {
  font-family: var(--font-mono, "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace);
}

.page-about .btn {
  display: inline-block;
  border-radius: 0;
  font-weight: 700;
  padding: 0.75rem 1.4rem;
  border: 2px solid var(--about-accent);
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  line-height: 1.2;
}

.page-about .btn-ghost {
  color: var(--about-text);
  background: transparent;
  box-shadow: 4px 4px 0 rgba(0, 230, 118, 0.15);
}

.page-about .btn-ghost:hover,
.page-about .btn-ghost:focus-visible {
  background: var(--about-accent);
  color: var(--about-bg-1);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.3);
  outline: none;
}

.page-about .btn-primary {
  background: var(--about-accent);
  color: #0A1F44;
  border-color: var(--about-accent);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.25);
}

.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background: var(--about-hot-2);
  border-color: var(--about-hot-2);
  transform: translate(2px, 2px);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.25);
  outline: none;
}

.page-about .btn-arrow {
  font-style: normal;
  margin-left: 0.5rem;
  display: inline-block;
}

.page-about .card {
  background: var(--about-bg-2);
  border: 1px solid rgba(0, 230, 118, 0.2);
  box-shadow: var(--about-shadow);
  padding: 1.5rem;
}

.page-about .media-frame {
  position: relative;
  background: var(--about-bg-2);
  border: 2px solid var(--about-bg-3);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

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

/* ---- 页头（面包屑） ---- */
.page-about .about-masthead {
  padding: 2rem 0 2.5rem;
  border-bottom: 2px solid rgba(0, 230, 118, 0.3);
  position: relative;
}

.page-about .about-breadcrumb {
  font-family: var(--font-mono, "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace);
  font-size: 0.8rem;
  color: var(--about-muted);
  margin: 0 0 1.5rem;
}

.page-about .about-breadcrumb a {
  color: var(--about-accent);
  text-decoration: none;
}

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  text-decoration: underline;
  outline: none;
}

.page-about .about-breadcrumb .crumb-sep {
  color: var(--about-hot-2);
  margin: 0 0.35rem;
}

.page-about .about-h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 1.25rem;
  max-width: 15ch;
}

.page-about .about-lead {
  font-size: 1rem;
  color: var(--about-muted);
  max-width: 46rem;
  margin: 0 0 1.5rem;
}

.page-about .about-stamp {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--about-hot);
  color: #0A1F44;
  padding: 0.5rem 1rem;
  font-weight: 700;
  transform: rotate(-2deg);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.25);
}

.page-about .stamp-year {
  font-size: 1.4rem;
  font-weight: 700;
}

.page-about .stamp-text {
  font-size: 0.9rem;
}

/* ---- 我们是谁 ---- */
.page-about .about-who-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  align-items: start;
}

.page-about .who-copy p {
  margin: 0 0 1rem;
  max-width: 54rem;
  color: rgba(245, 247, 250, 0.92);
}

.page-about .who-copy p:first-child {
  font-size: 1.05rem;
}

.page-about .about-link-btn {
  margin-top: 0.5rem;
}

.page-about .who-facts {
  border-left: 4px solid var(--about-accent);
  margin-top: 0.5rem;
}

.page-about .facts-title {
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  color: var(--about-white, #FFFFFF);
}

.page-about .data-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin: 0;
}

.page-about .data-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px dashed rgba(176, 190, 197, 0.2);
  padding-bottom: 0.5rem;
}

.page-about .data-label {
  font-size: 0.8rem;
  color: var(--about-muted);
  font-family: var(--font-mono, "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace);
}

.page-about .data-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--about-accent);
}

/* ---- 数据版图 ---- */
.page-about .coverage-intro {
  max-width: 46rem;
  margin: 0 0 1.5rem;
  color: rgba(245, 247, 250, 0.85);
}

.page-about .coverage-visual {
  position: relative;
  background: var(--about-bg-2);
  border: 2px solid var(--about-bg-3);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.3);
  padding: 1rem 0.5rem;
  overflow: hidden;
}

.page-about .coverage-visual::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--about-accent) 0%, var(--about-accent) 40%, var(--about-hot) 40%, var(--about-hot) 100%);
}

.page-about .coverage-svg {
  display: block;
  width: 100%;
  height: auto;
  min-height: 280px;
  overflow: visible;
}

.page-about .svg-coord-note {
  position: absolute;
  bottom: 0.6rem;
  right: 0.8rem;
  font-size: 0.7rem;
  color: var(--about-muted);
  letter-spacing: 0.12em;
}

.page-about .coverage-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .stat-card {
  flex: 1 1 100%;
  border-left: 4px solid var(--about-accent);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.2);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .stat-card:hover,
.page-about .stat-card:focus-within {
  transform: translateY(-3px);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.25);
}

.page-about .stat-num {
  display: block;
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--about-accent);
  font-family: var(--font-mono, "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace);
  line-height: 1.1;
}

.page-about .stat-num.stat-orange {
  color: var(--about-hot);
}

.page-about .stat-caption {
  display: block;
  font-size: 1rem;
  font-weight: 900;
  margin-top: 0.3rem;
}

.page-about .stat-desc {
  color: var(--about-muted);
  font-size: 0.88rem;
  margin: 0.35rem 0 0;
}

/* ---- 里程碑时间线 ---- */
.page-about .milestone-media {
  margin: 0 0 2.25rem;
}

.page-about .milestone-img {
  object-fit: cover;
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 1.2rem;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--about-accent) 0%, #00C853 45%, var(--about-hot) 100%);
  opacity: 0.6;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 3.4rem;
  margin-bottom: 2rem;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0.65rem;
  top: 0.65rem;
  width: 1.1rem;
  height: 1.1rem;
  background: var(--about-accent);
  border: 2px solid var(--about-bg-1);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.35);
  z-index: 2;
}

.page-about .timeline-item:nth-child(3n)::before {
  background: var(--about-hot);
}

.page-about .timeline-item:nth-child(3n+1)::before {
  background: var(--about-accent);
}

.page-about .timeline-item:nth-child(3n+2)::before {
  background: var(--about-hot-2);
}

.page-about .tl-year {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--about-accent);
  display: block;
  margin-bottom: 0.3rem;
}

.page-about .tl-card {
  background: var(--about-bg-2);
  border-left: 3px solid var(--about-accent);
  padding: 1rem 1.25rem;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.18);
}

.page-about .tl-card h3 {
  font-size: 1.05rem;
  font-weight: 900;
  margin: 0 0 0.35rem;
}

.page-about .tl-card p {
  margin: 0;
  color: rgba(245, 247, 250, 0.75);
  font-size: 0.92rem;
}

.page-about .timeline-cta {
  margin: 1rem 0 0;
}

/* ---- 技术团队 ---- */
.page-about .team-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .team-intro,
.page-about .tech-note p {
  color: rgba(245, 247, 250, 0.85);
  margin: 0;
}

.page-about .team-media {
  order: -1;
}

.page-about .team-img {
  width: 100%;
}

.page-about .team-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin: 0;
}

.page-about .team-item {
  background: var(--about-bg-2);
  border: 1px solid rgba(0, 230, 118, 0.15);
  padding: 1rem 1.1rem;
}

.page-about .team-item dt {
  color: var(--about-accent);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}

.page-about .team-item dd {
  margin: 0;
  color: rgba(245, 247, 250, 0.8);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about .tech-note {
  margin-top: 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  border-left: 4px solid var(--about-hot);
  background: var(--about-bg-3);
}

.page-about .tech-note-label {
  color: var(--about-hot);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  flex-shrink: 0;
}

/* ---- 认可与合作 ---- */
.page-about .recog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1rem 0 0;
}

.page-about .recog-card {
  border-top: 4px solid var(--about-accent);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.2);
  padding: 1.25rem;
}

.page-about .recog-card:nth-child(2n) {
  border-top-color: var(--about-hot);
}

.page-about .recog-card:nth-child(3n) {
  border-left: 3px solid rgba(0, 230, 118, 0.15);
}

.page-about .recog-type {
  font-size: 0.7rem;
  color: var(--about-muted);
  letter-spacing: 0.12em;
  display: block;
  margin-bottom: 0.5rem;
}

.page-about .recog-card h3 {
  font-size: 1.1rem;
  font-weight: 900;
  margin: 0 0 0.4rem;
  color: #FFFFFF;
}

.page-about .recog-card p {
  margin: 0;
  color: rgba(245, 247, 250, 0.75);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about .eco-system {
  margin-top: 2.25rem;
  background: var(--about-bg-3);
  border: 1px solid rgba(0, 230, 118, 0.2);
  padding: 1.5rem;
  box-shadow: var(--about-shadow);
}

.page-about .eco-title {
  font-size: 1.2rem;
  font-weight: 900;
  margin: 0 0 0.6rem;
}

.page-about .eco-system p {
  color: rgba(245, 247, 250, 0.85);
  max-width: 50rem;
}

.page-about .eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.page-about .tag {
  background: var(--about-bg-1);
  border: 1px solid var(--about-accent);
  color: var(--about-accent);
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
  font-family: var(--font-mono, "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace);
}

.page-about .trust-note {
  margin-top: 1.75rem;
  padding: 1.25rem;
  border-left: 4px solid var(--about-hot-2);
  background: rgba(255, 109, 0, 0.08);
}

.page-about .trust-note .trust-text {
  color: rgba(245, 247, 250, 0.85);
  font-size: 0.92rem;
  max-width: 48rem;
}

.page-about .trust-note strong {
  color: var(--about-hot-2);
}

.page-about .trust-note .btn {
  margin-top: 0.75rem;
}

/* ---- 联系入口 ---- */
.page-about .about-contact-nudge {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-top: 2.5rem;
  border-left: 5px solid var(--about-accent);
  background: var(--about-bg-3);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.25);
}

.page-about .nudge-content {
  flex: 1 1 60%;
}

.page-about .nudge-kicker {
  color: var(--about-accent);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
}

.page-about .nudge-content h3 {
  font-size: 1.2rem;
  font-weight: 900;
  margin: 0.25rem 0 0.35rem;
}

.page-about .nudge-content p {
  margin: 0;
  color: rgba(245, 247, 250, 0.8);
  font-size: 0.9rem;
}

/* ---- 桌面端 ≥ 980px ---- */
@media (min-width: 980px) {
  .page-about .about-main {
    display: grid;
    grid-template-columns: 1fr;
    padding-left: 6rem;
    padding-right: 2.5rem;
    position: relative;
  }

  /* 左侧固定索引条 */
  .page-about .about-rail {
    display: block;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 5rem;
    background: var(--about-bg-2);
    border-right: 2px solid var(--about-accent);
    z-index: 50;
    overflow-y: auto;
  }

  .page-about .rail-inner {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 6rem 0.75rem 2rem;
    gap: 0.5rem;
    writing-mode: horizontal-tb;
  }

  .page-about .rail-label {
    color: var(--about-muted);
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(0, 230, 118, 0.3);
    width: 100%;
  }

  .page-about .rail-link {
    display: block;
    color: var(--about-text);
    text-decoration: none;
    font-size: 0.63rem;
    letter-spacing: 0.1em;
    line-height: 1.3;
    padding: 0.35rem 0.25rem;
    border-left: 2px solid transparent;
    transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
    width: 100%;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-left-color: var(--about-accent);
    color: var(--about-accent);
    background: rgba(0, 230, 118, 0.05);
    outline: none;
  }

  .page-about .about-masthead {
    padding: 3.5rem 0 3rem;
  }

  .page-about .about-h1 {
    font-size: 3.4rem;
    max-width: 13ch;
  }

  .page-about .about-lead {
    font-size: 1.15rem;
    max-width: 44rem;
  }

  .page-about .about-block {
    padding: 4rem 0 2.5rem;
  }

  .page-about .about-who-grid {
    grid-template-columns: minmax(0, 3fr) minmax(260px, 2fr);
    gap: 2.5rem;
  }

  .page-about .who-copy p:first-child {
    font-size: 1.15rem;
  }

  .page-about .coverage-stats {
    flex-wrap: nowrap;
    gap: 1.25rem;
  }

  .page-about .stat-card {
    flex: 1;
  }

  .page-about .timeline {
    max-width: 760px;
    margin: 0 auto 0 2rem;
  }

  .page-about .timeline-item {
    padding-left: 4rem;
  }

  .page-about .team-wrap {
    grid-template-columns: minmax(0, 1.6fr) minmax(300px, 1fr);
    grid-template-areas: "intro intro" "media media" "team team";
    gap: 2rem;
  }

  .page-about .team-intro {
    grid-area: intro;
    max-width: 52rem;
  }

  .page-about .team-intro p {
    font-size: 1.08rem;
  }

  .page-about .team-media {
    grid-area: media;
  }

  .page-about .team-list {
    grid-area: team;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .page-about .recog-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .page-about .about-contact-nudge {
    flex-wrap: nowrap;
  }

  .page-about .about-contact-nudge .btn {
    flex-shrink: 0;
  }
}

/* ---- 超宽屏 ≥ 1280px 微调 ---- */
@media (min-width: 1280px) {
  .page-about .about-main {
    max-width: 1360px;
    padding-left: 7rem;
    padding-right: 3rem;
  }

  .page-about .about-h1 {
    font-size: 4rem;
  }

  .page-about .about-rail {
    width: 6rem;
  }

  .page-about .rail-inner {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

/* ---- 无障碍：焦点可见 ---- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 3px solid var(--about-hot);
  outline-offset: 2px;
}

.page-about .about-rail a:focus-visible {
  background: rgba(0, 230, 118, 0.12);
}

/* ---- 印刷感知的等宽文本高亮 ---- */
.page-about .about-head .section-title::after {
  content: "";
  position: absolute;
  left: 1rem;
  bottom: -0.35rem;
  width: 34px;
  height: 4px;
  background: var(--about-hot);
}

/* ---- 首屏独有：倾斜标签 ---- */
.page-about .about-masthead::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 120px;
  height: 24px;
  background: linear-gradient(135deg, transparent 0%, transparent 45%, var(--about-hot) 45%, var(--about-hot) 100%);
  opacity: 0.8;
  z-index: 1;
}

/* ---- 数据版图内的移动端细节 ---- */
@media (max-width: 640px) {
  .page-about .coverage-svg {
    min-height: 240px;
  }

  .page-about .about-head .section-title {
    font-size: 1.55rem;
  }

  .page-about .about-h1 {
    font-size: 2rem;
  }

  .page-about .about-stamp {
    transform: none;
  }

  .page-about .timeline::before {
    left: 0.9rem;
  }

  .page-about .timeline-item {
    padding-left: 2.9rem;
  }
}

.page-about {
  --about-white: currentColor;
}