:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e2e5ea;
  --accent: #3457d5;
  --accent-hover: #2a44ab;
  --danger: #d64545;
  --high: #d64545;
  --medium: #d68a2d;
  --low: #3a8a4c;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.view { max-width: 720px; margin: 0 auto; padding: 20px 16px 80px; }

/* ログイン画面 */
#login-view { display: flex; align-items: center; justify-content: center; min-height: 100vh; max-width: none; }
.login-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px 28px;
  width: min(360px, 90vw);
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  text-align: center;
}
.login-card h1 { margin: 0 0 4px; font-size: 1.4rem; }
.login-card .sub { color: var(--muted); margin: 0 0 20px; font-size: 0.9rem; }
#login-form { display: flex; flex-direction: column; gap: 10px; }

input, select, textarea, button {
  font: inherit;
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 10px 12px;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  font-weight: 600;
}
button:hover { background: var(--accent-hover); }
.ghost-btn { background: transparent; color: var(--muted); border: 1px solid var(--border); font-weight: 500; }
.ghost-btn:hover { background: #eee; color: var(--text); }

.error { color: var(--danger); font-size: 0.85rem; margin-top: 12px; }

/* アプリ画面 */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.app-header h1 { font-size: 1.3rem; margin: 0; }

.add-task-card, .controls {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  border: 1px solid var(--border);
}

#add-form { display: flex; flex-direction: column; gap: 10px; }
.add-form-row { display: flex; gap: 8px; flex-wrap: wrap; }
.add-form-row > * { flex: 1 1 120px; }
#task-title { font-size: 1rem; }
#add-form button { align-self: flex-end; padding: 8px 20px; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.controls label { display: flex; flex-direction: column; gap: 4px; font-size: 0.8rem; color: var(--muted); flex: 1 1 120px; }

.task-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }

.task-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.task-item.done .task-title { text-decoration: line-through; color: var(--muted); }

.task-item input[type="checkbox"] { margin-top: 4px; width: 18px; height: 18px; flex-shrink: 0; }

.task-body { flex: 1; min-width: 0; }
.task-title { font-weight: 600; word-break: break-word; }
.task-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; font-size: 0.78rem; }
.task-desc { margin: 6px 0 0; color: var(--muted); font-size: 0.85rem; white-space: pre-wrap; word-break: break-word; }

.badge { border-radius: 999px; padding: 2px 9px; font-weight: 600; color: #fff; }
.badge.priority-high { background: var(--high); }
.badge.priority-medium { background: var(--medium); }
.badge.priority-low { background: var(--low); }
.badge.category { background: var(--border); color: var(--text); }
.badge.due { background: #eef1fb; color: var(--accent); }
.badge.due.overdue { background: #fbeaea; color: var(--danger); }

.task-actions { display: flex; gap: 6px; flex-shrink: 0; }
.task-actions button { padding: 6px 10px; font-size: 0.8rem; }
.task-actions .delete-btn { background: var(--danger); }
.task-actions .delete-btn:hover { background: #a83232; }
.task-actions .edit-btn { background: var(--muted); }
.task-actions .edit-btn:hover { background: #4b5261; }

.edit-form { display: flex; flex-direction: column; gap: 8px; width: 100%; }
.edit-form .row { display: flex; gap: 8px; flex-wrap: wrap; }
.edit-form .row > * { flex: 1 1 100px; }
.edit-form .actions { display: flex; gap: 8px; justify-content: flex-end; }
.edit-form .actions .save-btn { background: var(--accent); }
.edit-form .actions .cancel-btn { background: var(--muted); }

.empty-message { text-align: center; color: var(--muted); padding: 40px 0; }

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: #fff;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.85rem;
  box-shadow: 0 4px 14px rgba(0,0,0,0.2);
}

@media (max-width: 480px) {
  .app-header h1 { font-size: 1.1rem; }
  .controls { gap: 10px; }
}