:root {
  --bg: #f4f6fa;
  --panel: #ffffff;
  --text: #1f2733;
  --muted: #6b7684;
  --border: #e2e6ee;
  --primary: #2f5fd0;
  --primary-dark: #23499f;
  --danger: #d9534f;
  --accent: #c26a12;
  --done: #16714a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.6;
}

.page-header {
  background: linear-gradient(135deg, #2f5fd0, #5a3fb8);
  color: #fff;
  padding: 24px 20px;
  text-align: center;
}
.page-header h1 { margin: 0; font-size: 1.6rem; }
.subtitle { margin: 4px 0 0; opacity: .85; font-size: .9rem; }

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
}

/* ダッシュボード */
.dashboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}
.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
  box-shadow: 0 1px 3px rgba(20, 30, 60, .06);
}
.stat-card--accent { border-color: var(--accent); }
.stat-label { font-size: .85rem; color: var(--muted); }
.stat-value { font-size: 2rem; font-weight: 700; }
.stat-card--accent .stat-value { color: var(--accent); }

/* 保存先の表示 */
.storage-mode {
  margin: 0 0 12px;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: .85rem;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
}
.storage-mode--local {
  border-color: #e3d4b4;
  background: #fdf7ea;
  color: #7a5c1e;
}

/* メッセージ */
.message {
  margin: 0 0 16px;
  padding: 10px 14px;
  border-radius: 8px;
  background: #fdecea;
  color: #a3312d;
  border: 1px solid #f5c6c3;
  font-size: .9rem;
}

/* パネル */
.columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: start;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  box-shadow: 0 1px 3px rgba(20, 30, 60, .06);
}
.panel h2 {
  margin: 0 0 14px;
  font-size: 1.15rem;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary);
}

/* フォーム */
.form { display: flex; flex-direction: column; gap: 10px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field > span { font-size: .85rem; color: var(--muted); }
input[type="text"], textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  background: #fbfcfe;
}
input[type="text"]:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
}
textarea { resize: vertical; }

.btn {
  font: inherit;
  border: none;
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
}
.btn--primary { background: var(--primary); color: #fff; }
.btn--primary:hover { background: var(--primary-dark); }
.btn--small { padding: 4px 10px; font-size: .8rem; }
.btn--toggle { background: #eef2fb; color: var(--primary-dark); }
.btn--toggle:hover { background: #dfe7fa; }
.btn--danger { background: #fbeceb; color: var(--danger); }
.btn--danger:hover { background: #f7dbd9; }

/* 一覧 */
.list-heading {
  margin: 20px 0 8px;
  font-size: .95rem;
  color: var(--muted);
}
.count { font-weight: 400; }

.list { list-style: none; margin: 0; padding: 0; }
.list li {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: #fdfdff;
}
.item-title { font-weight: 600; word-break: break-word; }
.item-body {
  margin: 4px 0 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: .92rem;
}
.item-meta {
  margin-top: 6px;
  font-size: .78rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: .75rem;
  border: 1px solid currentColor;
}
.badge--done { color: var(--done); }
.badge--open { color: var(--accent); }

.task-row { display: flex; align-items: flex-start; gap: 10px; }
.task-row .task-main { flex: 1; min-width: 0; }
.task-actions { display: flex; gap: 6px; flex-shrink: 0; }

li.is-done { background: #f5f7f5; }
li.is-done .item-title { text-decoration: line-through; color: var(--muted); }

.empty {
  color: var(--muted);
  font-size: .9rem;
  padding: 12px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 8px;
}

@media (max-width: 760px) {
  .columns { grid-template-columns: 1fr; }
  .dashboard { grid-template-columns: 1fr; }
}