:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #e2e4e9;
  --color-text: #1f2328;
  --color-muted: #6b7280;
  --color-primary: #3b6fe0;
  --color-primary-hover: #2f5bc0;
  --color-danger: #e0473b;
  --color-danger-hover: #c23b30;
  --color-success: #2f9e58;
}

* { box-sizing: border-box; }

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

header {
  background: var(--color-primary);
  color: #fff;
  padding: 16px 24px;
}

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

.dashboard {
  display: flex;
  gap: 16px;
  padding: 20px 24px 0;
  flex-wrap: wrap;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px 24px;
  min-width: 140px;
  text-align: center;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.card-value {
  font-size: 2rem;
  font-weight: bold;
  color: var(--color-primary);
}

.card-label {
  margin-top: 4px;
  color: var(--color-muted);
  font-size: 0.85rem;
}

main {
  display: flex;
  gap: 20px;
  padding: 20px 24px;
  flex-wrap: wrap;
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 20px;
  flex: 1 1 400px;
  min-width: 320px;
}

.panel h2 {
  font-size: 1.05rem;
  margin: 0 0 12px;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 8px;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.form input,
.form textarea {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
}

.form button {
  align-self: flex-start;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 18px;
  cursor: pointer;
  font-size: 0.95rem;
}

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

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 480px;
  overflow-y: auto;
}

.item {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 10px 12px;
}

.item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.item-title {
  font-weight: 600;
  word-break: break-word;
}

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

.item-body {
  margin-top: 6px;
  color: var(--color-text);
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.9rem;
}

.item-meta {
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--color-muted);
}

.item-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.item-actions button {
  border: none;
  border-radius: 4px;
  padding: 4px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  color: #fff;
}

.btn-done {
  background: var(--color-success);
}

.btn-undo {
  background: var(--color-muted);
}

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

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

.empty {
  color: var(--color-muted);
  font-size: 0.9rem;
  padding: 8px 0;
}

.status-badge {
  display: inline-block;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: 6px;
}

.status-badge.pending {
  background: #fff3cd;
  color: #8a6300;
}

.status-badge.done {
  background: #d7f3e1;
  color: #1f7a3f;
}