:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --panel-2: #111827;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --danger: #f87171;
  --ok: #4ade80;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 250px;
  background: var(--panel);
  border-right: 1px solid #334155;
  padding: 1rem;
  transition: transform 0.25s ease;
}
.logo { font-size: 1rem; margin: 0 0 1rem; }
.sidebar ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.nav-btn {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--text);
  border: 1px solid #334155;
  border-radius: 10px;
  padding: 0.7rem 0.9rem;
  cursor: pointer;
}
.nav-btn.active,
.nav-btn:hover { border-color: var(--accent); color: var(--accent); }

.main-content { flex: 1; padding: 1.4rem; }
.card {
  background: var(--panel-2);
  border: 1px solid #334155;
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}
h2 { margin-top: 0; }

textarea, input[type="text"] {
  width: 100%;
  background: #0b1220;
  border: 1px solid #334155;
  color: var(--text);
  border-radius: 8px;
  padding: 0.6rem;
}

button.primary, button.danger {
  border: 0;
  border-radius: 8px;
  padding: 0.55rem 0.8rem;
  color: #0b1220;
  cursor: pointer;
  margin-top: 0.5rem;
}
button.primary { background: var(--accent); }
button.danger { background: var(--danger); }

.list { display: grid; gap: 0.5rem; }
.item {
  background: #0b1220;
  border: 1px solid #334155;
  border-radius: 10px;
  padding: 0.7rem;
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
}
.item.done .item-text { text-decoration: line-through; color: var(--muted); }
.item-actions { display: flex; gap: 0.4rem; }
.small { font-size: 0.9rem; color: var(--muted); }

.menu-toggle {
  display: none;
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 1000;
  background: var(--panel);
  color: var(--text);
  border: 1px solid #334155;
  border-radius: 8px;
  padding: 0.5rem 0.6rem;
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .sidebar {
    position: fixed;
    height: 100vh;
    z-index: 999;
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .main-content { padding-top: 4rem; }
}