:root {
  --bg: #eef1f8;
  --panel: rgba(255, 255, 255, 0.72);
  --border: rgba(226, 230, 239, 0.9);
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #4f6ef7;
  --accent-hover: #3b57d6;
  --danger: #ef4444;
  --success: #22c55e;
  --shadow: 0 8px 24px rgba(31, 41, 55, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  color: var(--text);
  line-height: 1.6;
  background-color: var(--bg);
  /* 複数のソフトなグラデーションを重ねた洗練された背景 */
  background-image:
    radial-gradient(circle at 15% 15%, rgba(16, 185, 129, 0.22), transparent 45%),
    radial-gradient(circle at 85% 20%, rgba(52, 211, 153, 0.20), transparent 45%),
    radial-gradient(circle at 75% 85%, rgba(45, 212, 191, 0.18), transparent 45%),
    radial-gradient(circle at 25% 90%, rgba(132, 204, 22, 0.15), transparent 45%),
    linear-gradient(135deg, #f2fbf6 0%, #e7f6ee 100%);
  background-attachment: fixed;
}

.app-header {
  background: linear-gradient(135deg, #059669 0%, #10b981 55%, #34d399 100%);
  color: #fff;
  padding: 18px 24px;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.28);
}

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

.container {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 16px;
}

/* ダッシュボード */
.dashboard {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--panel);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 16px;
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(31, 41, 55, 0.12);
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  color: var(--muted);
  font-size: 0.9rem;
}

/* 最新の振り返り */
.latest-review {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(45, 212, 191, 0.10));
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: 16px;
  padding: 16px 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.latest-review-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.latest-review-icon {
  font-size: 1.1rem;
}

.latest-review-title {
  font-weight: 700;
  color: #047857;
}

.latest-review-week {
  margin-left: auto;
  font-size: 0.82rem;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.7);
  padding: 2px 10px;
  border-radius: 999px;
}

.latest-review-comment {
  margin: 0;
  white-space: pre-wrap;
  color: #1f2937;
}

/* 2カラムレイアウト */
.columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.panel {
  background: var(--panel);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.panel h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

/* フォーム */
.form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.form input,
.form textarea {
  padding: 10px;
  border: 1px solid rgba(210, 216, 230, 0.9);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
  background: rgba(255, 255, 255, 0.9);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form input:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.18);
}

.form button {
  align-self: flex-start;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s;
}

.form button:hover {
  background: var(--accent-hover);
}

/* リスト */
.list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.list li {
  border: 1px solid rgba(226, 230, 239, 0.8);
  border-radius: 10px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.85);
}

.memo-title {
  font-weight: 600;
  margin: 0 0 4px;
}

.memo-content {
  margin: 0 0 6px;
  white-space: pre-wrap;
  color: #374151;
}

.meta {
  font-size: 0.78rem;
  color: var(--muted);
}

/* タスク */
.task-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.task-main {
  flex: 1;
}

.task-title {
  margin: 0 0 4px;
}

.task-item.done .task-title {
  text-decoration: line-through;
  color: var(--muted);
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  margin-left: 6px;
}

.badge.open {
  background: #fef3c7;
  color: #92400e;
}

.badge.done {
  background: #d1fae5;
  color: #065f46;
}

.task-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.btn-sm {
  border: none;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
}

.btn-complete {
  background: var(--success);
  color: #fff;
}

.btn-delete {
  background: var(--danger);
  color: #fff;
}

.btn-sm:hover {
  opacity: 0.88;
}

.empty {
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 12px;
}

/* 週次振り返り */
.review-panel {
  margin-top: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field-label {
  font-size: 0.82rem;
  color: var(--muted);
}

.review-form .hint {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.review-week {
  font-weight: 600;
  margin: 0 0 4px;
  color: #047857;
}

@media (max-width: 720px) {
  .columns {
    grid-template-columns: 1fr;
  }
  .dashboard {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .stat-card {
    padding: 14px 8px;
  }
  .stat-value {
    font-size: 1.6rem;
  }
  .stat-label {
    font-size: 0.72rem;
    word-break: keep-all;
  }
}