/* ==========================================================
   DBC Studio 로그인 화면 스타일 (모던 다크 슬레이트 & 반응형)
   ========================================================== */
:root {
	--c-bg: #0b0f19;
	--c-panel: #1e293b;
	--c-panel-light: #242f44;
	--c-border: #334155;
	--c-border-focus: #38bdf8;
	--c-text: #f8fafc;
	--c-muted: #94a3b8;
	--c-primary: #2563eb;
	--c-primary-hover: #1d4ed8;
	--c-accent: #38bdf8;
	--c-error: #ef4444;
	--c-error-bg: rgba(239, 68, 68, 0.12);
	--radius: 12px;
	--radius-sm: 8px;
	--shadow: 0 20px 40px -8px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(255, 255, 255, 0.05);
	--font: "Pretendard", "Malgun Gothic", "Apple SD Gothic Neo", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

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

html, body {
	margin: 0;
	padding: 0;
	width: 100%;
	height: 100%;
	background-color: var(--c-bg);
	background-image: 
		radial-gradient(ellipse at 50% 15%, rgba(56, 189, 248, 0.08) 0%, transparent 60%),
		radial-gradient(ellipse at 80% 80%, rgba(37, 99, 235, 0.06) 0%, transparent 50%);
	color: var(--c-text);
	font-family: var(--font);
	font-size: 14px;
	line-height: 1.5;
	-webkit-font-smoothing: antialiased;
	display: flex;
	align-items: center;
	justify-content: center;
}

.login-wrapper {
	width: 100%;
	max-width: 420px;
	padding: 20px 16px;
	margin: auto;
}

.login-card {
	background: var(--c-panel);
	border: 1px solid var(--c-border);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
	padding: 36px 32px 30px;
	text-align: left;
	backdrop-filter: blur(10px);
	-webkit-backdrop-filter: blur(10px);
}

/* 브랜드 헤더 */
.login-header {
	text-align: center;
	margin-bottom: 24px;
}

.login-brand {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	margin-bottom: 8px;
	color: #fff;
	font-size: 24px;
	font-weight: 800;
	letter-spacing: -0.5px;
}

.login-brand__icon {
	color: var(--c-accent);
	font-size: 20px;
	filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.5));
}

.login-desc {
	margin: 0;
	color: var(--c-muted);
	font-size: 13px;
	letter-spacing: -0.2px;
}

/* 테스트 계정 안내 배지 (클릭 시 자동 입력) */
.demo-hint {
	display: flex;
	align-items: center;
	justify-content: space-between;
	background: rgba(56, 189, 248, 0.08);
	border: 1px dashed rgba(56, 189, 248, 0.35);
	padding: 8px 12px;
	border-radius: var(--radius-sm);
	margin-bottom: 22px;
	font-size: 12px;
	color: #bae6fd;
	cursor: pointer;
	transition: background .15s, border-color .15s;
}

.demo-hint:hover {
	background: rgba(56, 189, 248, 0.14);
	border-color: var(--c-accent);
}

.demo-hint__badge {
	font-weight: 700;
	background: rgba(56, 189, 248, 0.2);
	color: var(--c-accent);
	padding: 2px 6px;
	border-radius: 4px;
	font-size: 11px;
}

.demo-hint__action {
	font-size: 11px;
	color: var(--c-accent);
	text-decoration: underline;
}

/* 입력 필드 그룹 */
.login-form {
	display: flex;
	flex-direction: column;
	gap: 16px;
}

.login-form [hidden] {
	display: none;
}

.login-mode-btn {
	padding: 6px;
	background: transparent;
	border: 0;
	color: var(--c-accent);
	font: inherit;
	cursor: pointer;
}

.login-mode-btn:disabled {
	opacity: 0.6;
	cursor: not-allowed;
}

.form-group {
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.form-label {
	font-size: 12px;
	font-weight: 600;
	color: #cbd5e1;
	letter-spacing: -0.2px;
}

.input-wrap {
	position: relative;
	width: 100%;
}

.login-input {
	width: 100%;
	height: 44px;
	padding: 0 14px;
	background: #0f172a;
	border: 1px solid var(--c-border);
	border-radius: var(--radius-sm);
	color: #fff;
	font-size: 14px;
	outline: none;
	transition: border-color .15s, box-shadow .15s, background .15s;
	font-family: inherit;
}

.login-input:focus {
	border-color: var(--c-accent);
	box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
	background: #131d31;
}

.login-input::placeholder {
	color: #64748b;
	font-size: 13px;
}

.login-input.is-invalid {
	border-color: var(--c-error);
	box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

/* 비밀번호 보기 토글 버튼 */
.pw-toggle-btn {
	position: absolute;
	right: 10px;
	top: 50%;
	transform: translateY(-50%);
	background: transparent;
	border: none;
	color: var(--c-muted);
	font-size: 11px;
	font-weight: 600;
	cursor: pointer;
	padding: 4px 8px;
	border-radius: 4px;
}

.pw-toggle-btn:hover {
	color: #fff;
	background: #334155;
}

/* 에러 메시지 바 */
.login-error {
	padding: 10px 14px;
	background: var(--c-error-bg);
	border: 1px solid var(--c-error);
	color: #fca5a5;
	border-radius: var(--radius-sm);
	font-size: 12px;
	line-height: 1.4;
	display: none;
	word-break: keep-all;
}

.login-error.is-active {
	display: block;
}

/* 로그인 버튼 */
.login-btn {
	height: 46px;
	background: var(--c-primary);
	border: none;
	border-radius: var(--radius-sm);
	color: #fff;
	font-size: 15px;
	font-weight: 700;
	cursor: pointer;
	margin-top: 6px;
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	transition: background-color .15s, transform .1s, opacity .15s;
	box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.login-btn:hover:not(:disabled) {
	background: var(--c-primary-hover);
}

.login-btn:active:not(:disabled) {
	transform: scale(0.99);
}

.login-btn:disabled {
	opacity: 0.6;
	cursor: not-allowed;
}

/* 로딩 스피너 */
.btn-spinner {
	width: 16px;
	height: 16px;
	border: 2px solid rgba(255, 255, 255, 0.3);
	border-top-color: #fff;
	border-radius: 50%;
	animation: spin 0.8s linear infinite;
	display: none;
}

.login-btn.is-loading .btn-spinner {
	display: inline-block;
}

.login-btn.is-loading .btn-text {
	opacity: 0.8;
}

@keyframes spin {
	to { transform: rotate(360deg); }
}

/* 하단 카피라이트 */
.login-footer {
	text-align: center;
	margin-top: 20px;
	font-size: 12px;
	color: #64748b;
}

/* 모바일 화면 최적화 (<= 480px, 320px 지원) */
@media (max-width: 480px) {
	.login-wrapper {
		padding: 14px 10px;
	}
	.login-card {
		padding: 26px 20px 22px;
		border-radius: 10px;
	}
	.login-brand {
		font-size: 21px;
	}
	.login-desc {
		font-size: 12px;
	}
	.demo-hint {
		padding: 7px 10px;
		font-size: 11px;
	}
	.login-input {
		height: 42px;
		font-size: 13px;
	}
	.login-btn {
		height: 44px;
		font-size: 14px;
	}
}