:root {
  --bg: #0f1115;
  --panel: #1a1f29;
  --text: #e5e7eb;
  --muted: #9aa3b2;
  --accent: #7c3aed;
  --accent-2: #06b6d4;
  --danger: #ef4444;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

.app-header {
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-icon { border-radius: 8px; }
.subtitle { color: var(--muted); margin: 0; }

.app-main {
  max-width: 760px;
  margin: 0 auto;
  padding: 12px 16px 40px;
}

.new-todo { display: flex; gap: 8px; }
.new-todo input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid #2a3441;
  background: var(--panel);
  color: var(--text);
}
.new-todo button {
  padding: 12px 16px;
  border-radius: 10px;
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  cursor: pointer;
}
.new-todo button:hover { opacity: 0.95; }

.controls { display: flex; align-items: center; justify-content: space-between; margin-top: 12px; }
.filters { display: flex; gap: 6px; }
.filter-btn {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid #2a3441;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.filter-btn.active { border-color: var(--accent); color: #fff; }

#clear-completed {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid #2a3441;
  background: #1f2937;
  color: var(--danger);
  cursor: pointer;
}

.todo-list { list-style: none; padding: 0; margin: 16px 0 0; }
.todo-item {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #2a3441;
  background: var(--panel);
  margin-bottom: 8px;
}
.todo-title { margin: 0; }
.todo-title.completed { color: var(--muted); text-decoration: line-through; }
.todo-actions { display: flex; gap: 6px; }
.todo-actions button {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid #2a3441;
  background: #1f2937;
  color: var(--text);
  cursor: pointer;
}
.todo-actions button.danger { color: var(--danger); border-color: #3b1d1d; }

.app-footer { text-align: center; color: var(--muted); padding: 20px; }