/* ═══════════ about-page.css — "关于我们"页面样式 ═══════════ */

.about-page {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text);
  max-width: 820px;
  margin: 0 auto;
  padding: 0;
}

/* Hero */
.ab-hero {
  text-align: center;
  padding: 32px 20px 24px;
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
}
.ab-hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--c-accent);
  background: rgba(37,99,235,.08);
  padding: 3px 12px;
  border-radius: 4px;
  margin-bottom: 12px;
}
.ab-hero-name {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 4px;
}
.ab-hero-latin {
  font-size: 14px;
  font-weight: 400;
  color: var(--c-text-muted);
  margin-left: 6px;
}
.ab-hero-tagline {
  font-size: 14px;
  color: var(--c-text-secondary);
  margin-bottom: 12px;
}
.ab-hero-desc {
  font-size: 13px;
  color: var(--c-text-secondary);
  max-width: 560px;
  margin: 0 auto 16px;
  line-height: 1.7;
}
.ab-version-pill {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(37,99,235,.08);
  color: var(--c-accent);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  margin-bottom: 20px;
}
.ab-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  max-width: 480px;
  margin: 0 auto;
}
.ab-stat {
  text-align: center;
  padding: 10px 4px;
  background: var(--c-bg-subtle);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
}
.ab-stat-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-accent);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}
.ab-stat-label {
  font-size: 10px;
  color: var(--c-text-muted);
  margin-top: 2px;
}

/* Sub-nav */
.ab-subnav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 2px;
  padding: 0 16px;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-border);
}
.ab-subnav a {
  flex-shrink: 0;
  padding: 10px 12px;
  font-size: 12.5px;
  color: var(--c-text-secondary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
  white-space: nowrap;
  cursor: pointer;
}
.ab-subnav a:hover { color: var(--c-accent); }
.ab-subnav a.active { color: var(--c-accent); border-bottom-color: var(--c-accent); }

/* Body */
.ab-body {
  padding: 24px 20px 40px;
}
.ab-section {
  margin-bottom: 36px;
}
.ab-section-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--c-text);
}

/* Conventions */
.ab-conventions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.ab-conv-card {
  display: flex;
  gap: 14px;
  padding: 16px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
}
.ab-conv-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-accent);
  color: #fff;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
}
.ab-conv-body h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}
.ab-conv-body p {
  font-size: 13px;
  color: var(--c-text-secondary);
  line-height: 1.65;
  margin: 0;
}

/* Eras */
.ab-era {
  margin-bottom: 32px;
}
.ab-era-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
}
.ab-era-tag {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--c-accent);
  background: rgba(37,99,235,.08);
  padding: 2px 8px;
  border-radius: 4px;
  flex-shrink: 0;
}
.ab-era-title {
  font-size: 15px;
  font-weight: 700;
}
.ab-era-date {
  font-size: 12px;
  color: var(--c-text-muted);
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* Timeline */
.ab-timeline {
  position: relative;
  padding-left: 22px;
}
.ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--c-border);
}
.ab-tl-item {
  position: relative;
  margin-bottom: 16px;
}
.ab-tl-item:last-child { margin-bottom: 0; }
.ab-tl-dot {
  position: absolute;
  left: -22px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 2px solid var(--c-border);
  z-index: 1;
}
.ab-tl-item.major .ab-tl-dot {
  border-color: var(--c-accent);
  background: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.ab-tl-item.hotfix .ab-tl-dot {
  border-color: #f59e0b;
  background: #f59e0b;
}
.ab-tl-item.deprecated .ab-tl-dot {
  border-color: var(--c-text-muted);
  background: var(--c-bg-sunken);
}
.ab-tl-date {
  font-size: 11px;
  color: var(--c-text-muted);
  font-variant-numeric: tabular-nums;
  margin-bottom: 1px;
}
.ab-tl-title {
  font-size: 13.5px;
  font-weight: 600;
}
.ab-tl-item.major .ab-tl-title { color: var(--c-accent); }
.ab-tl-desc {
  font-size: 12.5px;
  color: var(--c-text-secondary);
  margin-top: 3px;
  line-height: 1.6;
}
.ab-tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}
.ab-tl-tag {
  font-size: 10px;
  padding: 1px 7px;
  border-radius: 3px;
  background: var(--c-bg-sunken);
  color: var(--c-text-secondary);
}

/* Changelog */
.ab-changelog {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.ab-cl-card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 16px;
}
.ab-cl-card.current {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 1px var(--c-accent);
}
.ab-cl-card.planned {
  opacity: 0.7;
}
.ab-cl-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.ab-cl-version {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.ab-cl-num {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.ab-cl-num.current { color: var(--c-accent); }
.ab-cl-num.future { color: var(--c-text-muted); }
.ab-cl-name {
  font-size: 14px;
  font-weight: 500;
}
.ab-cl-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}
.ab-cl-date {
  font-size: 11.5px;
  color: var(--c-text-muted);
  font-variant-numeric: tabular-nums;
}
.ab-cl-group {
  margin-bottom: 10px;
}
.ab-cl-group:last-child { margin-bottom: 0; }
.ab-cl-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 3px;
  margin-bottom: 6px;
}
.ab-cl-label.added {
  background: rgba(37,99,235,.08);
  color: var(--c-accent);
}
.ab-cl-label.fixed {
  background: rgba(245,158,11,.1);
  color: #b45309;
}
.ab-cl-list {
  margin: 0;
  padding-left: 18px;
  font-size: 12.5px;
  color: var(--c-text-secondary);
  line-height: 1.7;
}
.ab-cl-list li {
  margin-bottom: 2px;
}
.ab-cl-list li:last-child { margin-bottom: 0; }

.ab-va-status {
  font-size: 10px;
  padding: 2px 9px;
  border-radius: 20px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.ab-va-status.live { background: #dcfce7; color: #166534; }
.ab-va-status.testing { background: #fef9c3; color: #854d0e; }
.ab-va-status.planned { background: var(--c-bg-sunken); color: var(--c-text-muted); }

/* Contact */
.ab-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}
.ab-contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
}
.ab-contact-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-text-muted);
  min-width: 40px;
}
.ab-contact-value {
  font-size: 13px;
  color: var(--c-text);
}
a.ab-contact-value {
  color: var(--c-accent);
  text-decoration: none;
}
a.ab-contact-value:hover { text-decoration: underline; }
.ab-cta {
  text-align: center;
}
.ab-cta-btn {
  display: inline-block;
  padding: 10px 28px;
  background: var(--c-accent);
  color: #fff;
  border: none;
  border-radius: var(--r-md);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
}
.ab-cta-btn:hover { background: var(--c-accent-hover); }

/* Footer */
.ab-footer {
  text-align: center;
  padding: 20px;
  font-size: 11px;
  color: var(--c-text-muted);
  border-top: 1px solid var(--c-border);
}

/* Mobile */
@media (max-width: 640px) {
  .ab-hero { padding: 24px 14px 20px; }
  .ab-hero-name { font-size: 20px; }
  .ab-stats { grid-template-columns: repeat(2, 1fr); }
  .ab-body { padding: 18px 12px 32px; }
  .ab-era-header { flex-wrap: wrap; gap: 6px; }
  .ab-era-date { margin-left: 0; width: 100%; }
  .ab-timeline { padding-left: 18px; }
  .ab-tl-dot { left: -18px; width: 10px; height: 10px; }
  .ab-conv-card { padding: 12px; gap: 10px; }
  .ab-cl-card { padding: 12px; }
  .ab-cl-head { gap: 6px; }
}