/* ============================================================
   Learning Lab — Main Stylesheet
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:    #6366f1;
  --primary-dk: #4f46e5;
  --success:    #22c55e;
  --danger:     #ef4444;
  --warning:    #f59e0b;
  --text:       #1e293b;
  --text-muted: #64748b;
  --border:     #e2e8f0;
  --bg:         #f8fafc;
  --card-bg:    #ffffff;
  --radius:     8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Navbar ── */
.navbar {
  display: flex;
  align-items: center;
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  text-decoration: none;
  white-space: nowrap;
  margin-right: 8px;
  display: flex;
  align-items: center;
}

.navbar-logo {
  height: 36px;
  width: auto;
  display: block;
}

.nav-links { display: flex; gap: 4px; flex: 1; }

.nav-link {
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: background .15s, color .15s;
}
.nav-link:hover  { background: var(--bg); color: var(--text); text-decoration: none; }
.nav-link.active { background: #ede9fe; color: var(--primary); }

.nav-user {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
}

.btn-logout {
  padding: 5px 12px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: none;
}
.btn-logout:hover { background: var(--bg); color: var(--text); text-decoration: none; }

/* ── Main content ── */
.main-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 24px 60px;
}

/* ── Page header ── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.page-header h1 { font-size: 20px; font-weight: 700; }

/* ── Cards ── */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

/* ── Stats row ── */
.stats-row { display: flex; gap: 14px; margin-bottom: 24px; flex-wrap: wrap; }
.stat-card {
  flex: 1;
  min-width: 130px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-align: center;
}
.stat-card .stat-number { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label  { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ── Tables ── */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
th {
  background: #f1f5f9;
  text-align: left;
  padding: 10px 14px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8fafc; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: #374151;
  margin-bottom: 5px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: 7px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 90px; }

.form-row { display: flex; gap: 14px; }
.form-row .form-group { flex: 1; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: opacity .15s;
}
.btn:hover { opacity: .88; text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger  { background: var(--danger);  color: #fff; }
.btn-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1.5px solid var(--border);
}
.btn-sm { padding: 5px 10px; font-size: 12px; }

/* ── Badges ── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}
.badge-active   { background: #dcfce7; color: #14532d; }
.badge-inactive { background: #fee2e2; color: #7f1d1d; }
.badge-draft    { background: #f1f5f9; color: #475569; }
.badge-published{ background: #dbeafe; color: #1e3a5f; }
.badge-student  { background: #ede9fe; color: #3b0764; }
.badge-teacher  { background: #fef9c3; color: #713f12; }
.badge-admin    { background: #ffedd5; color: #7c2d12; }

/* ── Progress bar ── */
.progress-bar-wrap {
  background: #e2e8f0;
  border-radius: 20px;
  height: 8px;
  overflow: hidden;
  min-width: 80px;
}
.progress-bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 20px;
  transition: width .4s;
}

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 20px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

/* ── Utilities ── */
.text-muted  { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 16px; }
.mt-4 { margin-top: 24px; }
.mb-3 { margin-bottom: 16px; }
.d-flex { display: flex; }
.gap-2  { gap: 8px; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }