/* 算数·驾校 — 三端统一门户导航 */
.jx-portal-bar {
  position: sticky;
  top: 0;
  z-index: 200;
  background: linear-gradient(90deg, #0a3d38 0%, #0d4a44 50%, #0a3d38 100%);
  border-bottom: 1px solid rgba(255, 255, 255, .12);
  box-shadow: 0 4px 16px rgba(10, 40, 38, .18);
}
.jx-portal-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
  height: 48px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.jx-portal-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #e8f8f6;
  font-weight: 800;
  font-size: .92rem;
  white-space: nowrap;
  flex-shrink: 0;
}
.jx-portal-brand:hover { color: #fff; }
.jx-portal-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: #0abab5;
  color: #062;
  display: grid;
  place-items: center;
  font-size: .75rem;
  font-weight: 900;
}
.jx-portal-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 0;
}
.jx-portal-nav a {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 600;
  color: rgba(232, 248, 246, .88);
  border: 1px solid transparent;
  transition: background .15s, color .15s, border-color .15s;
}
.jx-portal-nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, .1);
}
.jx-portal-nav a.is-active {
  background: #fff;
  color: #0a3d38;
  border-color: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .12);
}
.jx-portal-tag {
  font-size: .72rem;
  color: rgba(232, 248, 246, .65);
  white-space: nowrap;
  flex-shrink: 0;
}
@media (max-width: 640px) {
  .jx-portal-inner { gap: 10px; padding: 0 12px; }
  .jx-portal-brand span:not(.jx-portal-mark) { font-size: .85rem; }
  .jx-portal-nav a { padding: 5px 10px; font-size: .78rem; }
  .jx-portal-tag { display: none; }
}

/* 官网三端入口卡片 */
.portal-trio-section {
  padding: 48px 0;
  background: linear-gradient(180deg, #f0faf9, #fff);
  border-bottom: 1px solid var(--line, #e2e8f0);
}
.portal-trio-section .sec-desc { margin-bottom: 24px; }
.portal-trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.portal-trio-card {
  display: block;
  background: #fff;
  border: 1px solid var(--line, #e2e8f0);
  border-radius: 16px;
  padding: 20px 18px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .06);
  transition: border-color .15s, transform .12s, box-shadow .15s;
}
.portal-trio-card:hover {
  border-color: var(--brand, #38bdf8);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(56, 189, 248, .12);
}
.portal-trio-card.is-current {
  border-color: #0abab5;
  background: linear-gradient(165deg, #fff, #eefaf8);
  box-shadow: 0 8px 28px rgba(10, 186, 181, .15);
}
.portal-trio-card .portal-trio-badge {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: #067a76;
  background: rgba(10, 186, 181, .12);
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.portal-trio-card h3 { margin: 0 0 6px; font-size: 1.1rem; }
.portal-trio-card p { margin: 0; font-size: .88rem; color: var(--muted, #64748b); line-height: 1.5; }
.portal-trio-card .portal-trio-go {
  display: inline-block;
  margin-top: 14px;
  font-size: .82rem;
  font-weight: 700;
  color: var(--brand-deep, #0284c7);
}
.portal-trio-card.is-current .portal-trio-go { color: #067a76; }

.dock-portal { gap: 6px; }
.dock-portal a.is-active {
  border-color: #0abab5;
  color: #067a76;
  background: #eefaf8;
}
@media (max-width: 768px) {
  .portal-trio { grid-template-columns: 1fr; }
}