:root {
  --bg: #0a0a14;
  --bg-card: #161625;
  --bg-sidebar: #0f0f1a;
  --border: #1e1e35;
  --text: #e2e8f0;
  --text-muted: #9ca3af;
  --primary: #6366f1;
  --primary-light: #818cf8;
  --accent: #a78bfa;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.5;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.flex-1 { flex: 1 1 0%; }
.min-w-0 { min-width: 0; }
.h-screen { height: 100vh; }
.h-full { height: 100%; }
.w-full { width: 100%; }
.w-64 { width: 16rem; }
.overflow-hidden { overflow: hidden; }
.overflow-y-auto { overflow-y: auto; }

.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-5 { padding-left: 1.25rem; padding-right: 1.25rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-5 { padding-top: 1.25rem; padding-bottom: 1.25rem; }
.m-0 { margin: 0; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mr-2 { margin-right: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.text-white { color: #fff; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary-light); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}
.card-hover:hover { border-color: rgba(99, 102, 241, 0.4); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  border-radius: 8px;
  border: none;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  color: white;
}
.btn-primary:hover { opacity: 0.9; }
.btn-secondary {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: rgba(255,255,255,0.1); }
.btn-danger { background: rgba(239,68,68,0.15); color: var(--danger); border: 1px solid rgba(239,68,68,0.3); }
.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.875rem; }

.input {
  width: 100%;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.625rem 0.875rem;
  color: white;
  font-size: 0.9375rem;
}
.input:focus { outline: none; border-color: var(--primary); }
.input::placeholder { color: #64748b; }

.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
}
.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.sidebar-link:hover { background: rgba(99,102,241,0.1); color: white; }
.sidebar-link.active { background: rgba(99,102,241,0.15); color: white; border-left: 3px solid var(--primary); }

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}
.badge-draft { background: rgba(148,163,184,0.15); color: #94a3b8; }
.badge-progress { background: rgba(99,102,241,0.15); color: var(--primary-light); }
.badge-review { background: rgba(245,158,11,0.15); color: var(--warning); }
.badge-completed { background: rgba(34,197,94,0.15); color: var(--success); }

.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .lg\:ml-64 { margin-left: 16rem; }
  .lg\:block { display: block; }
  .lg\:hidden { display: none; }
}

.hidden { display: none; }
.block { display: block; }

.divider { height: 1px; background: var(--border); margin: 0.75rem 0; }

/* Login page */
.login-bg {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: radial-gradient(circle at top right, rgba(99,102,241,0.15), transparent 40%), var(--bg);
}
.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
}

/* Module editor */
.editor-section {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 0.75rem;
}
.editor-section:hover { border-color: rgba(99,102,241,0.3); }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-sidebar); }
::-webkit-scrollbar-thumb { background: #334155; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #475569; }

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  padding: 0.875rem 1.25rem;
  border-radius: 10px;
  color: white;
  font-size: 0.875rem;
  z-index: 100;
  animation: slideIn 0.2s ease;
}
.toast.success { background: rgba(34,197,94,0.9); }
.toast.error { background: rgba(239,68,68,0.9); }
@keyframes slideIn {
  from { transform: translateY(10px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Loading spinner */
.spinner {
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }