/* 学習用のシンプルなスタイル。外部CDNには依存していない。 */
:root {
	--fg: #1f2933;
	--muted: #6b7280;
	--border: #d7dce3;
	--bg: #f5f7fa;
	--primary: #2563eb;
	--danger: #dc2626;
	--success: #15803d;
}

* {
	box-sizing: border-box;
}

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

.site-header {
	background: #fff;
	border-bottom: 1px solid var(--border);
}

.header-inner {
	max-width: 960px;
	margin: 0 auto;
	padding: 0.75rem 1rem;
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
}

.brand {
	font-weight: 700;
	font-size: 1.1rem;
	color: var(--fg);
	text-decoration: none;
}

.header-right {
	display: flex;
	align-items: center;
	gap: 0.75rem;
}

.user-name {
	color: var(--muted);
	font-size: 0.9rem;
}

.container {
	max-width: 960px;
	margin: 0 auto;
	padding: 1.5rem 1rem 3rem;
}

.container.narrow {
	max-width: 640px;
}

h1 {
	font-size: 1.4rem;
	margin: 0 0 1rem;
}

.page-head {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	margin-bottom: 1rem;
}

.page-head h1 {
	margin: 0;
}

.card {
	background: #fff;
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 1.25rem;
}

.field {
	margin-bottom: 1rem;
	display: flex;
	flex-direction: column;
	gap: 0.35rem;
}

label {
	font-size: 0.9rem;
	font-weight: 600;
}

input[type="text"],
input[type="password"],
input[type="date"],
input[type="file"],
textarea,
select {
	padding: 0.5rem;
	border: 1px solid var(--border);
	border-radius: 6px;
	font: inherit;
	background: #fff;
}

textarea {
	resize: vertical;
}

.required {
	color: var(--danger);
	font-size: 0.75rem;
	font-weight: 400;
}

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

.hint {
	color: var(--muted);
	font-size: 0.85rem;
}

.checkbox {
	font-weight: 400;
	margin-left: 0.5rem;
}

.actions {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	margin-top: 1rem;
	flex-wrap: wrap;
}

.btn {
	display: inline-block;
	padding: 0.45rem 0.9rem;
	border: 1px solid transparent;
	border-radius: 6px;
	font: inherit;
	cursor: pointer;
	text-decoration: none;
	background: #fff;
	color: var(--fg);
	border-color: var(--border);
}

.btn-primary {
	background: var(--primary);
	color: #fff;
	border-color: var(--primary);
}

.btn-secondary {
	background: #fff;
}

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

.btn-link {
	background: none;
	border: none;
	color: var(--primary);
	padding: 0.25rem;
	text-decoration: underline;
}

.btn-small {
	padding: 0.25rem 0.6rem;
	font-size: 0.85rem;
}

.inline-form {
	display: inline;
}

.search-form {
	display: flex;
	gap: 0.5rem;
	margin-bottom: 1rem;
	align-items: center;
}

.table {
	width: 100%;
	border-collapse: collapse;
	background: #fff;
	border: 1px solid var(--border);
	border-radius: 8px;
	overflow: hidden;
}

.table th,
.table td {
	padding: 0.6rem 0.75rem;
	border-bottom: 1px solid var(--border);
	text-align: left;
	font-size: 0.92rem;
	vertical-align: middle;
}

.table thead th {
	background: #eef2f7;
	font-size: 0.85rem;
}

.table tbody tr:last-child td {
	border-bottom: none;
}

.row-actions {
	display: flex;
	gap: 0.4rem;
	align-items: center;
}

.badge {
	display: inline-block;
	padding: 0.1rem 0.5rem;
	border-radius: 999px;
	font-size: 0.8rem;
	border: 1px solid var(--border);
	background: #eef2f7;
}

.badge-doing {
	background: #e0edff;
	border-color: #b6d3ff;
}

.badge-done {
	background: #e3f5e8;
	border-color: #b7e0c4;
	color: var(--success);
}

.overdue-mark {
	color: var(--danger);
	font-size: 0.75rem;
	margin-left: 0.25rem;
}

.alert {
	padding: 0.6rem 0.9rem;
	border-radius: 6px;
	margin: 0 0 1rem;
	font-size: 0.9rem;
}

.alert-success {
	background: #e3f5e8;
	color: var(--success);
}

.alert-error {
	background: #fdeaea;
	color: var(--danger);
}

.empty {
	color: var(--muted);
}

.detail {
	display: grid;
	grid-template-columns: 7rem 1fr;
	gap: 0.5rem 1rem;
	margin: 0 0 1rem;
}

.detail dt {
	color: var(--muted);
	font-size: 0.9rem;
}

.detail dd {
	margin: 0;
}

.pre-wrap {
	white-space: pre-wrap;
}

.site-footer {
	border-top: 1px solid var(--border);
	padding: 1rem;
	text-align: center;
	color: var(--muted);
	background: #fff;
}