/* Shared styles for the Learning Library */
:root {
  --bg: #f5f8fc;
  --card: #ffffff;
  --ink: #1f2937;
  --muted: #64748b;
  --accent: #0f4c81;
  --accent-2: #1e6bb8;
  --accent-soft: #dbeafe;
  --pink: #db2777;
  --pink-soft: #fce7f3;
  --teal: #0d9488;
  --teal-soft: #ccfbf1;
  --amber: #d97706;
  --amber-soft: #fef3c7;
  --violet: #7c3aed;
  --violet-soft: #ede9fe;
  --green: #16a34a;
  --green-soft: #dcfce7;
  --red: #dc2626;
  --red-soft: #fee2e2;
  --border: #e2e8f0;
  --shadow: 0 4px 14px rgba(15,76,129,.08);
  --shadow-lg: 0 12px 32px rgba(15,76,129,.12);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.wrap { max-width: 960px; margin: 0 auto; padding: 24px 18px 80px; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: white;
  padding: 32px 26px;
  border-radius: 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}
.hero h1 { margin: 0 0 6px; font-size: 28px; font-weight: 700; }
.hero .sub { font-size: 14px; opacity: .9; }
.crumbs { font-size: 13px; margin-bottom: 12px; opacity: .9; }
.crumbs a { color: rgba(255,255,255,.85); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; color: white; }

/* Cards & grids */
.grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 600px) { .grid.cols-2 { grid-template-columns: 1fr 1fr; } }
@media (min-width: 900px) { .grid.cols-3 { grid-template-columns: 1fr 1fr 1fr; } }

.card {
  background: var(--card);
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform .15s ease, box-shadow .15s ease;
}
a.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.card h2 { margin: 0 0 6px; color: var(--accent); font-size: 22px; }
.card h3 { margin: 0 0 4px; color: var(--accent); font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: .5px;
  margin-bottom: 8px;
}
.badge.accent { background: var(--accent-soft); color: var(--accent); }
.badge.pink   { background: var(--pink-soft);   color: var(--pink); }
.badge.teal   { background: var(--teal-soft);   color: var(--teal); }
.badge.amber  { background: var(--amber-soft);  color: var(--amber); }
.badge.violet { background: var(--violet-soft); color: var(--violet); }
.badge.green  { background: var(--green-soft);  color: var(--green); }
.badge.red    { background: var(--red-soft);    color: var(--red); }

.subj-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  margin-bottom: 10px;
}

.section-title {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--muted);
  font-weight: 700;
  margin: 22px 0 10px;
}

.muted { color: var(--muted); }
.kbd { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; background: #eef2f7; padding: 2px 6px; border-radius: 6px; font-size: 13px; }

.empty {
  border: 2px dashed var(--border);
  border-radius: 14px;
  padding: 26px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  background: white;
}

/* Topic card states */
.topic-status {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .6px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
}
.topic-status.ready { background: var(--green-soft); color: var(--green); }
.topic-status.draft { background: var(--amber-soft); color: var(--amber); }
.topic-status.todo  { background: var(--border);     color: var(--muted); }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
}
.btn:hover { background: var(--accent-2); }
.btn.ghost { background: white; color: var(--accent); border: 2px solid var(--accent); }

footer.foot { text-align: center; color: var(--muted); font-size: 12px; margin-top: 30px; }