/* 后台登录 — 简洁居中 */
:root {
	--login-primary: #0d47a1;
	--login-primary-light: #1976d2;
	--login-accent: #00838f;
	--login-text: #1a2332;
	--login-muted: #64748b;
	--login-border: #e2e8f0;
	--login-card: #ffffff;
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

html, body {
	margin: 0;
	padding: 0;
	height: 100%;
}

.login-body {
	min-height: 100vh;
	font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
	color: var(--login-text);
	position: relative;
}

.login-bg {
	position: fixed;
	inset: 0;
	z-index: 0;
	background:
		radial-gradient(circle at 15% 20%, rgba(0, 131, 143, 0.12) 0%, transparent 42%),
		radial-gradient(circle at 85% 80%, rgba(13, 71, 161, 0.15) 0%, transparent 45%),
		linear-gradient(160deg, #0a1628 0%, #0d47a1 45%, #004d40 100%);
}

.login-bg::after {
	content: "";
	position: absolute;
	inset: 0;
	background-image:
		linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
		linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
	background-size: 40px 40px;
	opacity: 0.5;
}

.login-main {
	position: relative;
	z-index: 1;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 32px 20px 24px;
}

.login-card {
	width: 100%;
	max-width: 420px;
	background: var(--login-card);
	border-radius: 16px;
	padding: 40px 36px 36px;
	box-shadow:
		0 0 0 1px rgba(255, 255, 255, 0.08),
		0 24px 48px rgba(0, 0, 0, 0.22),
		0 8px 16px rgba(13, 71, 161, 0.08);
	animation: loginFadeUp 0.5s ease-out;
}

@keyframes loginFadeUp {
	from {
		opacity: 0;
		transform: translateY(16px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

.login-brand {
	text-align: center;
	margin-bottom: 32px;
	padding-bottom: 28px;
	border-bottom: 1px solid var(--login-border);
}

.login-brand-icon {
	width: 56px;
	height: 56px;
	margin: 0 auto 16px;
	border-radius: 14px;
	background: linear-gradient(145deg, var(--login-primary), var(--login-accent));
	color: #fff;
	font-size: 26px;
	font-weight: 800;
	line-height: 56px;
	box-shadow: 0 8px 20px rgba(13, 71, 161, 0.25);
}

.login-brand-title {
	margin: 0;
	font-size: 18px;
	font-weight: 600;
	line-height: 1.5;
	color: var(--login-text);
	letter-spacing: 0.02em;
}

.login-alert {
	display: flex;
	align-items: center;
	gap: 8px;
	padding: 10px 14px;
	margin-bottom: 20px;
	border-radius: 8px;
	background: #fef2f2;
	border: 1px solid #fecaca;
	color: #b91c1c;
	font-size: 13px;
	line-height: 1.4;
}

.login-alert i {
	flex-shrink: 0;
	font-size: 14px;
}

.login-field {
	margin-bottom: 18px;
}

.login-field label {
	display: block;
	font-size: 13px;
	font-weight: 500;
	color: #334155;
	margin-bottom: 6px;
}

.login-input-wrap {
	position: relative;
}

.login-input-wrap i {
	position: absolute;
	left: 13px;
	top: 50%;
	transform: translateY(-50%);
	color: #94a3b8;
	font-size: 14px;
	pointer-events: none;
}

.login-input-wrap:focus-within i {
	color: var(--login-primary);
}

.login-input {
	width: 100%;
	height: 44px;
	padding: 0 12px 0 38px;
	border: 1px solid var(--login-border);
	border-radius: 8px;
	font-size: 14px;
	color: var(--login-text);
	background: #f8fafc;
	outline: none;
	transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.login-input:focus {
	border-color: var(--login-primary-light);
	background: #fff;
	box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.12);
}

.login-input::placeholder {
	color: #94a3b8;
}

.login-captcha-row {
	display: flex;
	gap: 10px;
}

.login-captcha-row .login-input-wrap {
	flex: 1;
	min-width: 0;
}

.login-captcha-btn {
	flex-shrink: 0;
	width: 120px;
	height: 44px;
	padding: 0;
	border: 1px solid var(--login-border);
	border-radius: 8px;
	background: #f8fafc;
	cursor: pointer;
	overflow: hidden;
	transition: border-color 0.15s;
}

.login-captcha-btn:hover {
	border-color: var(--login-primary-light);
}

.login-captcha-btn img {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;
}

.login-submit {
	width: 100%;
	height: 46px;
	margin-top: 6px;
	border: none;
	border-radius: 8px;
	font-size: 15px;
	font-weight: 600;
	letter-spacing: 0.2em;
	color: #fff;
	cursor: pointer;
	background: linear-gradient(135deg, var(--login-primary) 0%, var(--login-primary-light) 100%);
	box-shadow: 0 4px 14px rgba(13, 71, 161, 0.35);
	transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
}

.login-submit:hover {
	transform: translateY(-1px);
	box-shadow: 0 6px 20px rgba(13, 71, 161, 0.4);
}

.login-submit:active {
	transform: translateY(0);
}

.login-submit.is-loading {
	opacity: 0.75;
	pointer-events: none;
}

.login-foot {
	margin: 24px 0 0;
	font-size: 12px;
	color: rgba(255, 255, 255, 0.45);
	text-align: center;
}

@media (max-width: 480px) {
	.login-card {
		padding: 32px 24px 28px;
		border-radius: 14px;
	}

	.login-brand-title {
		font-size: 16px;
	}

	.login-captcha-row {
		flex-direction: column;
	}

	.login-captcha-btn {
		width: 100%;
		height: 44px;
	}
}