/* Learning Hub — 深青绿工程风，与 RL Demo 教学站气质对齐 */

:root {
  --hub-accent: #3dcf9a;
  --hub-accent2: #e8b86d;
}

[data-md-color-scheme="slate"] {
  --md-default-bg-color: #0c1412;
  --md-default-bg-color--light: #13201c;
  --md-default-fg-color: #e8f0ec;
  --md-default-fg-color--light: #9bb5aa;
  --md-primary-fg-color: #1a2e28;
  --md-accent-fg-color: var(--hub-accent);
  --md-typeset-a-color: var(--hub-accent);
}

.md-header {
  background: rgba(12, 20, 18, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(61, 207, 154, 0.22);
}

.md-typeset h1 {
  font-weight: 600;
  letter-spacing: 0.01em;
}

.md-typeset .hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 2rem;
}

.md-typeset .hub-card {
  display: block;
  padding: 1.25rem 1.35rem;
  border: 1px solid rgba(61, 207, 154, 0.25);
  border-radius: 10px;
  background: rgba(19, 32, 28, 0.55);
  color: inherit !important;
  text-decoration: none !important;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.md-typeset .hub-card:hover {
  border-color: var(--hub-accent);
  transform: translateY(-2px);
}

.md-typeset .hub-card h3 {
  margin: 0 0 0.4rem;
  color: var(--hub-accent);
}

.md-typeset .hub-card p {
  margin: 0;
  color: #9bb5aa;
  font-size: 0.92em;
}

.md-typeset .hub-section-title {
  margin-top: 2.5rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid rgba(61, 207, 154, 0.25);
}

.md-typeset .hub-cta {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  background: rgba(61, 207, 154, 0.15);
  border: 1px solid rgba(61, 207, 154, 0.35);
  color: var(--hub-accent) !important;
  text-decoration: none !important;
  font-weight: 500;
}

.md-typeset .hub-cta:hover {
  background: rgba(61, 207, 154, 0.25);
}