body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #f5f5f5;
}
header, footer {
    padding: 10px 20px;
    background: #222;
    color: #fff;
}
main {
    padding: 20px;
}
.login-box {
    max-width: 360px;
    margin: 60px auto;
    padding: 24px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.login-box h2 {
    margin-top: 0;
    margin-bottom: 16px;
}
.form-group {
    margin-bottom: 12px;
}
.form-group label {
    display: block;
    margin-bottom: 4px;
}
.form-group input {
    width: 100%;
    box-sizing: border-box;
    padding: 6px 8px;
}
.captcha-group {
    display: flex;
    align-items: center;
    gap: 8px;
}
#captcha-img {
    cursor: pointer;
    border: 1px solid #ddd;
}
.btn-primary {
    width: 100%;
    padding: 8px 0;
    border: none;
    border-radius: 4px;
    background: #007bff;
    color: #fff;
    font-size: 14px;
    cursor: pointer;
}
.btn-primary:hover {
    background: #0069d9;
}
.alert-error {
    margin-bottom: 12px;
    padding: 8px 10px;
    background: #ffe6e6;
    color: #b00020;
    border-radius: 4px;
}

/* 后台整体布局 */
.admin-body {
	margin: 0;
}

.admin-layout {
	display: flex;
	min-height: 100vh;
}

.admin-sidebar {
	width: 220px;
	background: #111827;
	color: #e5e7eb;
}

.admin-logo {
	padding: 16px;
	font-size: 16px;
	font-weight: 600;
	border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.admin-menu {
	font-size: 14px;
}

.admin-menu ul {
	list-style: none;
	margin: 0;
	padding: 0;
}

.admin-menu a {
	display: block;
	padding: 8px 16px;
	color: #d1d5db;
	text-decoration: none;
}

.admin-menu a:hover {
	background: #1f2937;
	color: #fff;
}

.admin-menu-group-title {
	padding: 10px 16px 6px;
	font-size: 12px;
	letter-spacing: 0.04em;
	text-transform: uppercase;
	color: #6b7280;
}

.admin-sub-menu li.is-active > a {
	background: #2563eb;
	color: #fff;
}

.admin-menu-empty {
	padding: 12px 16px;
	font-size: 13px;
	color: #9ca3af;
}

.admin-main {
	flex: 1;
	display: flex;
	flex-direction: column;
}

.admin-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 12px 20px;
	background: #ffffff;
	border-bottom: 1px solid #e5e7eb;
}

.admin-header-title {
	font-size: 16px;
	font-weight: 500;
}

.admin-header-user {
	font-size: 13px;
	color: #6b7280;
}

.admin-header-user a {
	margin-left: 8px;
	color: #2563eb;
	text-decoration: none;
}

.admin-header-user a:hover {
	text-decoration: underline;
}

.admin-content {
	flex: 1;
	padding: 20px;
}

.admin-footer {
	padding: 10px 20px;
	font-size: 12px;
	color: #9ca3af;
	text-align: center;
	border-top: 1px solid #e5e7eb;
}

@media (max-width: 768px) {
	.admin-layout {
		flex-direction: column;
	}

	.admin-sidebar {
		width: 100%;
	}
}