/* =====================================================
   Class Planner — Summit Homework style
   ===================================================== */
:root {
  --cp-primary: #2563EB;
  --cp-primary-dark: #1D4ED8;
  --cp-primary-light: #DBEAFE;
  --cp-bg: #F8FAFC;
  --cp-surface: #FFFFFF;
  --cp-text: #111827;
  --cp-text-secondary: #6B7280;
  --cp-text-muted: #9CA3AF;
  --cp-border: #E5E7EB;
  --cp-border-dark: #D1D5DB;
  --cp-success: #16A34A;
  --cp-success-light: #DCFCE7;
  --cp-warning: #F59E0B;
  --cp-warning-light: #FEF3C7;
  --cp-danger: #DC2626;
  --cp-danger-light: #FEE2E2;
  --cp-radius-sm: 8px;
  --cp-radius: 14px;
  --cp-radius-pill: 9999px;
  --cp-shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.05);
  --cp-shadow-md: 0 4px 8px rgba(0,0,0,0.08), 0 8px 24px rgba(0,0,0,0.06);
  --cp-shadow-lg: 0 8px 16px rgba(0,0,0,0.10), 0 16px 48px rgba(0,0,0,0.08);
  --cp-nav-height: 64px;
}

html { overflow-y: scroll; }

body {
  font-family: Arial, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--cp-bg);
  color: var(--cp-text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  font-weight: 400;
  font-size: 16px;
}

h1, h2, h3, h4, h5, h6 { font-weight: 700; letter-spacing: -0.02em; color: var(--cp-text); }
h1 { font-size: 40px; } h2 { font-size: 28px; } h3 { font-size: 22px; }
h4 { font-size: 18px; } h5 { font-size: 16px; } h6 { font-size: 14px; }
p { font-size: 16px; color: var(--cp-text-secondary); }

/* Container */
.cp-container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 24px;
  width: 100%;
}

/* Navbar override */
.navbar.bg-dark {
  background: #1E293B !important;
  height: var(--cp-nav-height);
  box-shadow: 0 1px 3px rgba(0,0,0,0.12);
  padding: 0 24px;
}
.navbar.bg-dark > .container-fluid {
  padding: 0;
  height: 100%;
  display: flex;
  align-items: center;
}
.navbar-dark .navbar-nav { align-items: center; gap: 2px; }
.navbar-dark .navbar-nav .nav-link {
  font-weight: 500;
  font-size: 15px;
  padding: 10px 16px !important;
  border-radius: var(--cp-radius-sm);
  transition: all 0.2s ease;
  color: rgba(255,255,255,0.8) !important;
  position: relative;
}
.navbar-dark .navbar-nav .nav-link:hover {
  background: rgba(255,255,255,0.08) !important;
  color: #fff !important;
}
.navbar-dark .navbar-nav .nav-link.active {
  color: #fff !important;
  background: rgba(255,255,255,0.10) !important;
}
.navbar-dark .navbar-nav .nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 16px;
  right: 16px;
  height: 3px;
  background: #fff;
  border-radius: 3px;
}

/* User dropdown */
.navbar .dropdown-toggle { display: flex; align-items: center; font-weight: 500; }
.navbar .dropdown-menu {
  border: none;
  box-shadow: var(--cp-shadow-md);
  border-radius: var(--cp-radius-sm);
  padding: 4px;
  margin-top: 8px;
  min-width: 180px;
}
.navbar .dropdown-item {
  border-radius: 6px;
  padding: 8px 12px;
  font-weight: 500;
  font-size: 14px;
  transition: background 0.15s ease;
}
.navbar .dropdown-item:hover {
  background: var(--cp-primary-light);
  color: var(--cp-primary);
}

/* Cards */
.card {
  background: var(--cp-surface);
  border-radius: var(--cp-radius);
  border: 1px solid var(--cp-border);
  box-shadow: var(--cp-shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--cp-shadow-md); }
.card-header {
  background: transparent;
  border-bottom: 1px solid var(--cp-border);
  padding: 16px 24px;
  font-weight: 700;
  font-size: 16px;
}
.card-body { padding: 24px; }

/* Buttons */
.btn {
  font-weight: 600;
  border-radius: var(--cp-radius-sm);
  padding: 12px 20px;
  transition: all 0.15s ease;
  font-size: 14px;
  line-height: 1.2;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 8px rgba(0,0,0,0.10); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--cp-primary); border-color: var(--cp-primary); color: #fff; }
.btn-primary:hover { background: var(--cp-primary-dark); border-color: var(--cp-primary-dark); color: #fff; }
.btn-success { background: var(--cp-success); border-color: var(--cp-success); color: #fff; }
.btn-success:hover { background: #15803D; border-color: #15803D; color: #fff; }
.btn-danger { background: var(--cp-danger); border-color: var(--cp-danger); color: #fff; }
.btn-danger:hover { background: #B91C1C; border-color: #B91C1C; color: #fff; }
.btn-outline-primary { color: var(--cp-primary); border: 1px solid var(--cp-primary); background: transparent; }
.btn-outline-primary:hover { background: var(--cp-primary); color: #fff; }
.btn-outline-secondary { color: var(--cp-text-secondary); border: 1px solid var(--cp-border-dark); background: transparent; }
.btn-outline-secondary:hover { background: #F3F4F6; border-color: var(--cp-border-dark); color: var(--cp-text); }
.btn-outline-success { color: var(--cp-success); border: 1px solid var(--cp-success); background: transparent; }
.btn-outline-success:hover { background: var(--cp-success); color: #fff; }
.btn-sm { padding: 8px 16px; font-size: 13px; }

/* Forms */
.form-control, .form-select {
  height: 44px;
  border-radius: var(--cp-radius-sm);
  padding: 12px;
  border: 1px solid var(--cp-border-dark);
  font-size: 14px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  background: var(--cp-surface);
  color: var(--cp-text);
}
.form-control:focus, .form-select:focus {
  border-color: var(--cp-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
  outline: none;
}
.form-control::placeholder { color: var(--cp-text-muted); }
.form-label { font-weight: 600; font-size: 14px; color: var(--cp-text); margin-bottom: 6px; }
textarea.form-control { height: auto; min-height: 100px; }

/* Alerts */
.alert {
  border: none;
  border-radius: var(--cp-radius-sm);
  padding: 16px 20px;
  font-weight: 500;
  font-size: 14px;
}
.alert-success { background: var(--cp-success-light); color: #166534; }
.alert-danger { background: var(--cp-danger-light); color: #991B1B; }
.alert-warning { background: var(--cp-warning-light); color: #92400E; }
.alert-info { background: var(--cp-primary-light); color: var(--cp-primary-dark); }

/* Badges */
.badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: var(--cp-radius-pill);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.3;
  white-space: nowrap;
}
.badge-success { background: var(--cp-success-light); color: #166534; }
.badge-warning { background: var(--cp-warning-light); color: #92400E; }
.badge-danger { background: var(--cp-danger-light); color: #991B1B; }
.badge-info { background: var(--cp-primary-light); color: var(--cp-primary-dark); }

/* Modals */
.modal-content {
  border: none;
  border-radius: var(--cp-radius);
  box-shadow: var(--cp-shadow-lg);
}
.modal-header {
  border-bottom: 1px solid var(--cp-border);
  background: #FAFAFA;
  border-radius: var(--cp-radius) var(--cp-radius) 0 0;
  padding: 16px 24px;
}
.modal-body { padding: 24px; }
.modal-footer { border-top: 1px solid var(--cp-border); padding: 16px 24px; }

/* Tables */
.table { font-size: 14px; }
.table thead th {
  background: #F8FAFC;
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--cp-text-secondary);
  padding: 16px 12px;
  border-bottom: 2px solid var(--cp-border);
  white-space: nowrap;
}
.table tbody tr { transition: background 0.15s ease; }
.table tbody tr:nth-child(even) { background: #FAFAFA; }
.table tbody tr:hover { background: #F3F4F6; }
.table tbody td { padding: 12px; vertical-align: middle; border-bottom: 1px solid var(--cp-border); }

/* List group */
.list-group-item {
  border: none;
  border-bottom: 1px solid var(--cp-border);
  padding: 12px 16px;
  transition: background 0.15s ease;
}
.list-group-item:first-child { border-radius: var(--cp-radius-sm) var(--cp-radius-sm) 0 0; }
.list-group-item:last-child { border-bottom: none; border-radius: 0 0 var(--cp-radius-sm) var(--cp-radius-sm); }
.list-group-item:hover { background: #F9FAFB; }
.list-group-item.active { background: var(--cp-primary); border-color: var(--cp-primary); }

/* Links */
a { color: var(--cp-primary); transition: color 0.15s ease; }
a:hover { color: var(--cp-primary-dark); }

/* Dropdowns */
.dropdown-menu {
  border: none;
  box-shadow: var(--cp-shadow-md);
  border-radius: var(--cp-radius-sm);
  padding: 4px;
}
.dropdown-item {
  border-radius: 6px;
  padding: 8px 12px;
  font-weight: 500;
  font-size: 14px;
  transition: background 0.15s ease;
}
.dropdown-item:hover { background: var(--cp-primary-light); color: var(--cp-primary); }

/* Topic items */
.topic-item { cursor: grab; }
.topic-item:active { cursor: grabbing; }

/* Session note input */
.session-note-input { height: 36px !important; font-size: 13px !important; }

/* Color picker buttons */
.color-choice { cursor: pointer; }

/* Responsive */
@media (max-width: 768px) {
  .cp-container { padding: 16px; }
  h1 { font-size: 28px; }
  h2 { font-size: 22px; }
  h3 { font-size: 18px; }
  h4 { font-size: 16px; }
  .navbar.bg-dark { height: auto; min-height: var(--cp-nav-height); }
  .navbar-dark .navbar-nav .nav-link.active::after { display: none; }
}