.page-about {
  --about-violet: #1A1233;
  --about-teal: #0F2A2E;
  --about-ink: #0B0E14;
  --about-line: #2A3A4A;
  background: var(--about-ink);
}

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

/* ========== HERO / 收录范围 ========== */

.page-about .about-hero {
  position: relative;
  background: var(--about-violet);
  overflow: hidden;
}

.page-about .about-hero-media {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.32;
}

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

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.page-about .about-hero-kicker {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin: 0 0 8px;
}

.page-about .about-hero h1 {
  font-size: 28px;
  line-height: 1.3;
  margin: 0 0 16px;
  font-weight: 800;
  max-width: 720px;
  color: var(--text-strong);
}

.page-about .about-hero-lead {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-weak);
  max-width: 760px;
  margin: 0 0 28px;
}

.page-about .about-hero-lead strong {
  color: var(--green);
  font-family: var(--font-data);
  font-weight: 600;
  font-size: 15px;
}

.page-about .about-index-strip {
  margin-bottom: 28px;
}

.page-about .about-stat-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 32px;
}

.page-about .about-stat-primary {
  background: rgba(0, 26, 39, 0.55);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 16px;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.page-about .about-stat-num {
  font-family: var(--font-data);
  font-size: 56px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  letter-spacing: -0.02em;
}

.page-about .about-stat-caption {
  font-size: 13px;
  color: var(--text-weak);
  margin-top: 10px;
  letter-spacing: 0.04em;
}

.page-about .about-stat-side {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .about-stat-cell {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--about-line);
  border-radius: 12px;
  padding: 14px 8px;
  text-align: center;
}

.page-about .about-stat-cell-num {
  display: block;
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-stat-cell-label {
  display: block;
  font-size: 12px;
  color: var(--text-weak);
  margin-top: 4px;
}

.page-about .about-scope-grid {
  display: grid;
  gap: 16px;
  margin-bottom: 24px;
}

.page-about .about-scope-card {
  border-radius: 16px;
  padding: 20px;
  border: 1px solid var(--about-line);
}

.page-about .about-scope-card--include {
  background: rgba(16, 26, 38, 0.72);
  border-left: 4px solid var(--green);
}

.page-about .about-scope-card--exclude {
  background: rgba(23, 16, 34, 0.68);
  border-left: 4px solid var(--red);
}

.page-about .about-scope-card h2 {
  font-size: 18px;
  margin: 0 0 8px;
  font-weight: 700;
  color: var(--text-strong);
}

.page-about .about-scope-desc {
  font-size: 13px;
  color: var(--text-weak);
  line-height: 1.7;
  margin-bottom: 14px;
}

.page-about .about-scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-scope-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--about-line);
  font-size: 14px;
  color: var(--text-main);
}

.page-about .about-scope-list li:last-child {
  border-bottom: none;
}

.page-about .about-scope-list b {
  font-family: var(--font-data);
  color: var(--cyan);
  font-weight: 600;
  margin-left: auto;
}

.page-about .about-scope-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
  box-shadow: 0 0 8px currentColor;
}

.page-about .about-scope-dot--green { background: var(--green); color: var(--green); }
.page-about .about-scope-dot--cyan { background: var(--cyan); color: var(--cyan); }
.page-about .about-scope-dot--yellow { background: var(--yellow); color: var(--yellow); }
.page-about .about-scope-dot--orange { background: var(--status-new); color: var(--status-new); }
.page-about .about-scope-dot--purple { background: #9C27B0; color: #9C27B0; }

.page-about .about-scope-x {
  width: 18px;
  height: 18px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(244, 67, 54, 0.14);
  color: var(--red);
  border-radius: 4px;
  font-size: 12px;
  line-height: 1;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ========== 分类体系 ========== */

.page-about .about-cat {
  background: var(--about-ink);
  padding: 48px 0;
}

.page-about .about-cat-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 16px;
}

.page-about .about-cat-layout {
  margin-top: 24px;
}

.page-about .about-cat-lead,
.page-about .about-update-lead,
.page-about .about-version-lead {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-weak);
  margin: 10px 0 0;
  max-width: 820px;
}

.page-about .about-cat-tree {
  position: relative;
}

.page-about .about-cat-nest {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid rgba(0, 212, 255, 0.22);
  margin-left: 14px;
}

.page-about .about-cat-branch {
  position: relative;
}

.page-about .about-cat-branch-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--card-bg);
  border: 1px solid var(--about-line);
  border-radius: 10px;
  margin: 6px 0;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-cat-branch-head:hover {
  border-color: rgba(0, 212, 255, 0.5);
  background: var(--card-highlight);
}

.page-about .about-cat-branch--root > .about-cat-branch-head {
  background: rgba(16, 26, 38, 0.85);
  border-color: rgba(0, 212, 255, 0.35);
  margin-bottom: 10px;
  padding: 14px 16px;
}

.page-about .about-cat-branch--root > .about-cat-branch-head .about-cat-name {
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-cat-caret {
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 5px 0 5px 7px;
  border-color: transparent transparent transparent var(--cyan);
  flex: none;
  display: inline-block;
}

.page-about .about-cat-branch--root > .about-cat-branch-head .about-cat-caret {
  border-color: transparent transparent transparent var(--green);
}

.page-about .about-cat-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-strong);
  flex: 1;
}

.page-about .about-cat-badge {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.08);
  border-radius: 20px;
  padding: 3px 10px;
  white-space: nowrap;
}

.page-about .about-cat-branch--root .about-cat-badge {
  color: var(--green);
  background: rgba(57, 255, 20, 0.1);
}

.page-about .about-cat-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 8px 6px 6px;
  margin-bottom: 4px;
}

.page-about .about-cat-tag-label {
  font-size: 12px;
  color: var(--text-weak);
  margin-right: 2px;
  flex: none;
}

.page-about .about-cat-note {
  font-size: 13px;
  color: var(--text-weak);
  line-height: 1.7;
  padding: 6px 6px 12px;
  border-left: 2px solid rgba(255, 215, 0, 0.4);
  margin: 2px 0 8px 6px;
}

.page-about .about-cat-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  object-fit: cover;
  border-radius: 16px;
  margin: 24px auto 0;
  display: block;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

/* ========== 更新机制 ========== */

.page-about .about-update {
  background: linear-gradient(180deg, var(--about-ink) 0%, var(--about-teal) 120%);
  padding: 48px 0;
}

.page-about .about-update-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 16px;
}

.page-about .about-update-layout {
  margin-top: 24px;
  display: grid;
  gap: 24px;
}

.page-about .table-wrap {
  overflow-x: auto;
  border-radius: 14px;
  border: 1px solid var(--about-line);
  background: rgba(11, 14, 20, 0.72);
}

.page-about .about-batch-panel {
  background: rgba(15, 42, 46, 0.72);
  border: 1px solid rgba(0, 255, 127, 0.25);
  border-radius: 14px;
  padding: 18px 16px;
}

.page-about .about-batch-panel h3 {
  font-size: 16px;
  margin: 0 0 16px;
  color: var(--text-strong);
}

.page-about .about-batch-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-batch-row {
  display: grid;
  grid-template-columns: 52px 1fr 48px;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .about-batch-row:last-child {
  margin-bottom: 0;
}

.page-about .about-batch-idx {
  font-family: var(--font-data);
  color: var(--cyan);
  font-size: 13px;
  white-space: nowrap;
}

.page-about .about-batch-track {
  background: rgba(255, 255, 255, 0.07);
  border-radius: 10px;
  height: 8px;
  overflow: hidden;
}

.page-about .about-batch-fill {
  display: block;
  height: 100%;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--cyan), var(--green));
}

.page-about .about-batch-num {
  font-family: var(--font-data);
  color: var(--green);
  font-size: 15px;
  text-align: right;
  font-weight: 600;
}

.page-about .about-update-link {
  margin-top: 16px;
}

/* ========== 版本历程 ========== */

.page-about .about-version {
  position: relative;
  background: var(--about-violet);
  padding: 48px 0 56px;
  overflow: hidden;
}

.page-about .about-version-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 220px;
  object-fit: cover;
  opacity: 0.18;
  z-index: 0;
  display: block;
}

.page-about .about-version-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 16px;
}

.page-about .about-timeline {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  list-style: none;
  padding: 0;
}

.page-about .about-timeline-item {
  background: rgba(22, 27, 34, 0.78);
  border: 1px solid var(--about-line);
  border-radius: 14px;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}

.page-about .about-timeline-item:hover {
  border-color: var(--cyan);
  transform: translateX(4px);
  box-shadow: 0 6px 20px rgba(0, 212, 255, 0.15);
}

.page-about .about-timeline-item--current {
  border-color: rgba(57, 255, 20, 0.5);
}

.page-about .about-timeline-item--current:hover {
  border-color: var(--green);
  box-shadow: 0 6px 20px rgba(57, 255, 20, 0.15);
}

.page-about .about-timeline-item--current::before {
  content: "当前版本";
  position: absolute;
  top: -10px;
  right: 14px;
  background: var(--green);
  color: #0B0E14;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  letter-spacing: 0.04em;
}

.page-about .about-timeline-version {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 18px;
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.08);
  border-radius: 8px;
  padding: 4px 10px;
  flex: none;
}

.page-about .about-timeline-item--current .about-timeline-version {
  color: var(--green);
  background: rgba(57, 255, 20, 0.1);
}

.page-about .about-timeline-desc {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.5;
}

.page-about .about-version-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

/* ========== 平板 / 桌面端 ========== */

@media (min-width: 480px) {
  .page-about .about-hero-inner {
    padding: 32px 24px 44px;
  }

  .page-about .about-stat-band {
    grid-template-columns: 220px 1fr;
    align-items: stretch;
  }

  .page-about .about-stat-primary {
    padding: 20px 16px;
  }

  .page-about .about-stat-side {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    align-content: stretch;
  }

  .page-about .about-stat-cell {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}

@media (min-width: 768px) {
  .page-about .about-hero-inner {
    padding: 36px 32px 56px;
  }

  .page-about .about-hero h1 {
    font-size: 36px;
    line-height: 1.25;
    max-width: 760px;
  }

  .page-about .about-hero-lead {
    font-size: 15px;
    max-width: 840px;
  }

  .page-about .about-scope-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .about-scope-card {
    padding: 24px;
  }

  .page-about .about-cat,
  .page-about .about-update,
  .page-about .about-version {
    padding: 64px 0;
  }

  .page-about .about-cat-inner,
  .page-about .about-update-inner,
  .page-about .about-version-inner {
    padding: 0 32px;
  }

  .page-about .about-cat-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 28px;
    align-items: start;
    margin-top: 28px;
  }

  .page-about .about-cat-img {
    margin: 0;
    width: 100%;
    position: sticky;
    top: 110px;
  }

  .page-about .about-update-layout {
    grid-template-columns: 1fr 320px;
    gap: 28px;
    align-items: start;
  }

  .page-about .about-batch-panel {
    padding: 22px 20px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 32px;
  }

  .page-about .about-timeline-item {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 12px;
    min-height: 120px;
  }

  .page-about .about-timeline-item:hover {
    transform: translateY(-6px);
  }

  .page-about .about-version-actions {
    margin-top: 32px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-inner,
  .page-about .about-cat-inner,
  .page-about .about-update-inner,
  .page-about .about-version-inner {
    padding-left: 48px;
    padding-right: 48px;
  }

  .page-about .about-stat-num {
    font-size: 68px;
  }

  .page-about .about-stat-cell-num {
    font-size: 30px;
  }

  .page-about .about-cat-layout {
    grid-template-columns: 1fr 320px;
  }
}