/* style.css — mobile-first, clean, dark mode aware */
:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --danger: #dc2626;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --card-bg: #1e1e1e;
    --text: #f0f0f0;
    --text-muted: #9ca3af;
    --border: #333333;
    --accent: #60a5fa;
    --danger: #f87171;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-bottom: 5rem;
}

.app-header {
  max-width: 600px;
  margin: 0 auto;
  padding: 1.25rem 1rem 0.5rem;
}

.app-header h1 {
  font-size: 1.4rem;
  margin: 0;
}

#app {
  max-width: 600px;
  margin: 0 auto;
  padding: 0.5rem 1rem 1rem;
}

.status-msg {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  color: var(--text-muted);
}

.group-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 1rem 1rem;
  margin-bottom: 1rem;
}

.group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.group-name {
  font-size: 1.05rem;
  margin: 0;
  word-break: break-word;
}

.group-actions {
  display: flex;
  gap: 0.25rem;
  flex-shrink: 0;
}

.icon-btn {
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 1rem;
  padding: 0.25rem 0.4rem;
  border-radius: 6px;
  color: var(--text-muted);
}

.icon-btn:hover {
  background: var(--bg);
}

.delete-group-btn, .remove-todo-btn {
  color: var(--danger);
}

.todo-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.todo-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}

.todo-item:last-child {
  border-bottom: none;
}

.todo-checkbox {
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
  accent-color: var(--accent);
}

.todo-text {
  flex: 1;
  word-break: break-word;
}

/* marcado: risco + opacidade reduzida (classe .done, com fallback :has para navegadores modernos) */
.todo-item.done .todo-text,
.todo-item:has(.todo-checkbox:checked) .todo-text {
  text-decoration: line-through;
  opacity: 0.55;
}

.add-todo-form {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.add-todo-input {
  flex: 1;
  padding: 0.5rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

.add-todo-btn {
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 0.9rem;
  cursor: pointer;
}

.fab {
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  z-index: 10;
}

@media (min-width: 640px) {
  .fab {
    left: auto;
    right: calc(50% - 300px + 1rem);
    transform: none;
  }
}