/* --- Global & Reset --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
	--sidebar-bg: #2c3e50;
	--sidebar-text: #ecf0f1;
	--sidebar-active-bg: #3498db;
	--main-bg: #f4f6f9;
	--content-bg: #ffffff;
	--primary-color: #3498db;
	--border-color: #e0e0e0;
	--text-color: #333;
	--text-light-color: #777;
	--color-green: #2ecc71;
	--color-blue: #3498db;
	--color-red: #e74c3c;
	--color-yellow: #f1c40f;
	--color-gray: #95a5a6;
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	font-family: 'Noto Sans KR', sans-serif;
	background-color: var(--main-bg);
	color: var(--text-color);
	font-size: 14px;
}

/* --- Layout --- */
.app-container {
	display: flex;
	min-height: 100vh;
}

.sidebar {
	width: 240px;
	background-color: var(--sidebar-bg);
	color: var(--sidebar-text);
	flex-shrink: 0;
}

.content {
	flex-grow: 1;
	padding: 24px;
}

/* --- Sidebar --- */
.sidebar-header {
	padding: 20px;
	text-align: center;
	border-bottom: 1px solid #34495e;
}

.sidebar-header h1 {
	font-size: 20px;
	font-weight: 700;
}

.sidebar-nav ul {
	list-style: none;
	padding: 15px 0;
}
.sidebar-nav .nav-category {
	padding: 10px 20px;
	font-size: 12px;
	color: #95a5a6;
	text-transform: uppercase;
	font-weight: 700;
	margin-top: 10px;
}

.sidebar-nav a {
	display: block;
	padding: 12px 20px;
	color: var(--sidebar-text);
	text-decoration: none;
	transition: background-color 0.2s;
	font-size: 14px;
}
.sidebar-nav a:hover {
	background-color: #34495e;
}
.sidebar-nav a.active {
	background-color: var(--primary-color);
	font-weight: 500;
}
.sidebar-nav a i {
	margin-right: 12px;
	width: 20px;
	text-align: center;
}

/* --- Content Area --- */
.content-header {
	margin-bottom: 24px;
}
.content-header h2 {
	font-size: 24px;
	font-weight: 500;
}

.content-body {
	background-color: var(--content-bg);
	border: 1px solid var(--border-color);
	border-radius: 8px;
	padding: 24px;
}

/* --- Monitoring Page --- */
.floor-selector select {
	padding: 8px 12px;
	border-radius: 4px;
	border: 1px solid var(--border-color);
	min-width: 200px;
	font-size: 14px;
}

.locker-section {
	margin-top: 24px;
}
.section-title {
	font-size: 18px;
	margin-bottom: 16px;
	font-weight: 500;
}
.section-title i {
	color: var(--text-light-color);
	font-size: 14px;
	margin-left: 5px;
}

.locker-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
	gap: 20px;
}

.locker-card {
	background-color: var(--content-bg);
	border: 1px solid var(--border-color);
	border-radius: 8px;
	overflow: hidden;
	display: flex;
	flex-direction: column;
	transition: transform 0.2s, box-shadow 0.2s;
}
.locker-card:hover {
	transform: translateY(-5px);
	box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.locker-card .card-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 12px 16px;
	color: white;
}

.locker-card .locker-number {
	font-size: 18px;
	font-weight: 700;
}

.locker-card .locker-status {
	font-size: 14px;
	font-weight: 500;
}

.locker-card .card-body {
	flex-grow: 1;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	padding: 20px;
	text-align: center;
}

.locker-card .card-body > i {
	font-size: 48px;
	margin-bottom: 12px;
}

.locker-card .user-info p {
	margin: 4px 0;
	font-size: 13px;
	color: var(--text-color);
	display: flex;
	align-items: center;
}
.locker-card .user-info p i {
	margin-right: 8px;
	width: 16px;
	color: var(--text-light-color);
}

.locker-card .error-msg {
	font-size: 14px;
	font-weight: 500;
	color: var(--color-red);
}

.locker-card .card-footer {
	display: flex;
	justify-content: space-around;
	background-color: #f8f9fa;
	padding: 10px;
	font-size: 12px;
	color: var(--text-light-color);
	border-top: 1px solid var(--border-color);
}

.locker-card .card-footer .footer-item {
	display: flex;
	align-items: center;
	gap: 6px;
}

/* Card Status: Available */
.locker-card.available .card-header {
	background-color: var(--color-green);
}
.locker-card.available .card-body > i {
	color: var(--color-green);
}

/* Card Status: In Use */
.locker-card.in-use .card-header {
	background-color: var(--color-blue);
}
.locker-card.in-use .card-body {
	align-items: flex-start;
}

/* Card Status: Error */
.locker-card.error .card-header {
	background-color: var(--color-red);
}
.locker-card.error .card-body > i {
	color: var(--color-red);
}
.locker-card.error .card-footer {
	background-color: #fff0f0;
}

/* Card Status: Maintenance */
.locker-card.maintenance .card-header {
	background-color: var(--color-gray);
}
.locker-card.maintenance .card-body > i {
	color: var(--color-gray);
}
.locker-card.maintenance .card-footer {
	background-color: #f5f5f5;
}

/* --- Forms (Tenant, Locker etc.) --- */
.form-container {
	max-width: 600px;
}
.form-group {
	margin-bottom: 16px;
}
.form-group label {
	display: block;
	font-weight: 500;
	margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
	width: 100%;
	padding: 10px;
	border: 1px solid var(--border-color);
	border-radius: 4px;
	font-size: 14px;
}
.form-group textarea {
	min-height: 100px;
	resize: vertical;
}

/* --- Tables (Sensor Management) --- */
.data-table {
	width: 100%;
	border-collapse: collapse;
}
.data-table th,
.data-table td {
	border: 1px solid var(--border-color);
	padding: 12px;
	text-align: left;
}
.data-table thead {
	background-color: #f8f9fa;
}
.data-table th {
	font-weight: 500;
}

/* --- Buttons --- */
.btn {
	padding: 10px 20px;
	border: none;
	border-radius: 4px;
	cursor: pointer;
	font-size: 14px;
	font-weight: 500;
}
.btn-primary {
	background-color: var(--primary-color);
	color: white;
}
.btn-secondary {
	background-color: #6c757d;
	color: white;
}
.form-actions {
	margin-top: 24px;
	display: flex;
	gap: 10px;
	justify-content: flex-end;
}

/* --- Gateway Page --- */
.gateway-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
	gap: 16px;
}
.gateway-card {
	border: 1px solid var(--border-color);
	border-radius: 8px;
	padding: 20px;
	text-align: center;
}
.gateway-card i {
	font-size: 48px;
	color: var(--text-light-color);
	margin-bottom: 12px;
}
.gateway-card span {
	font-weight: 500;
}

/* --- Locker Page Specific --- */
.locker-management-container {
	display: flex;
	gap: 24px;
}
.locker-tree-panel {
	width: 300px;
	border: 1px solid var(--border-color);
	border-radius: 8px;
	padding: 16px;
	flex-shrink: 0;
}
.locker-details-panel {
	flex-grow: 1;
	border: 1px solid var(--border-color);
	border-radius: 8px;
	padding: 16px;
}
.panel-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding-bottom: 10px;
	margin-bottom: 10px;
	border-bottom: 1px solid var(--border-color);
}
.panel-header h3 {
	font-size: 16px;
	font-weight: 500;
}
.panel-actions button {
	background: none;
	border: 1px solid var(--border-color);
	padding: 5px 8px;
	border-radius: 4px;
	cursor: pointer;
}
.locker-tree ul {
	list-style: none;
	padding-left: 20px;
}
.locker-tree li {
	padding: 8px 0;
}
.locker-tree a {
	text-decoration: none;
	color: var(--text-color);
}
.locker-tree a.active {
	font-weight: 700;
	color: var(--primary-color);
}
.locker-tree i {
	margin-right: 8px;
}

/* --- Action Bar --- */
.action-bar {
	margin-bottom: 20px;
}

/* --- Modal Styles --- */
.modal-overlay {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-color: rgba(0, 0, 0, 0.5);
	display: none; /* Initially hidden */
	justify-content: center;
	align-items: center;
	z-index: 1000;
}
.modal-content {
	background-color: white;
	padding: 24px;
	border-radius: 8px;
	width: 90%;
	max-width: 500px;
	box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}
.modal-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 16px;
}
.modal-header h3 {
	font-size: 18px;
	font-weight: 500;
}
.close-button {
	background: none;
	border: none;
	font-size: 24px;
	cursor: pointer;
	color: #777;
}
.modal-body ol {
	padding-left: 20px;
	line-height: 1.8;
}
.modal-body li {
	margin-bottom: 8px;
}
.modal-footer {
	margin-top: 24px;
	text-align: right;
}

/* --- Tenant Page Specific --- */
.tenant-management-container {
	display: flex;
	gap: 24px;
	height: calc(100vh - 150px); /* Adjust height as needed */
}

.tenant-list-panel {
	width: 320px;
	flex-shrink: 0;
	background-color: var(--content-bg);
	border: 1px solid var(--border-color);
	border-radius: 8px;
	display: flex;
	flex-direction: column;
}

.tenant-details-panel {
	flex-grow: 1;
	background-color: var(--content-bg);
	border: 1px solid var(--border-color);
	border-radius: 8px;
}

.panel-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 16px;
	border-bottom: 1px solid var(--border-color);
	flex-shrink: 0;
}

.panel-header h3 {
	font-size: 16px;
	font-weight: 700;
}

.panel-actions .btn {
	margin-left: 8px;
}

.btn-sm {
	padding: 5px 10px;
	font-size: 12px;
}

.btn-danger {
	background-color: #e74c3c;
	color: white;
}

.btn-outline {
	background-color: transparent;
	border: 1px solid var(--border-color);
	color: var(--text-color);
}

.search-bar {
	position: relative;
	padding: 16px;
	border-bottom: 1px solid var(--border-color);
}

.search-bar input {
	width: 100%;
	padding: 10px 10px 10px 35px; /* Add padding for icon */
	border: 1px solid var(--border-color);
	border-radius: 4px;
}

.search-bar i {
	position: absolute;
	left: 30px;
	top: 50%;
	transform: translateY(-50%);
	color: var(--text-light-color);
}

.tenant-list {
	list-style: none;
	overflow-y: auto;
	flex-grow: 1;
}

.tenant-list li a {
	display: block;
	padding: 16px;
	text-decoration: none;
	color: var(--text-color);
	border-bottom: 1px solid var(--border-color);
}

.tenant-list li:last-child a {
	border-bottom: none;
}

.tenant-list li.active a {
	background-color: #eaf5ff;
}
.tenant-list li.active {
	border-right: 3px solid var(--primary-color);
}

.tenant-list li a:hover {
	background-color: #f8f9fa;
}

.tenant-list .tenant-name {
	font-weight: 500;
	display: block;
	font-size: 15px;
}

.tenant-list .tenant-id {
	font-size: 13px;
	color: var(--text-light-color);
}

.details-content {
	padding: 24px;
}

.form-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 20px;
}

.form-group.full-width {
	grid-column: 1 / -1;
}

.form-group input[readonly] {
	background-color: #f8f9fa;
	cursor: not-allowed;
}

.users-section {
	margin-top: 30px;
	padding-top: 20px;
	border-top: 1px solid var(--border-color);
}

.users-section h4 {
	font-size: 16px;
	font-weight: 700;
	margin-bottom: 16px;
}

.status-active {
	color: #27ae60;
	font-weight: 700;
}

.content-header p {
	color: var(--text-light-color);
	margin-top: 4px;
}

.data-table .btn-group {
	display: flex;
	gap: 8px;
}

.status-inactive {
	color: var(--text-light-color);
}

.modal-body .form-group small {
	font-size: 12px;
	color: var(--text-light-color);
	margin-top: 4px;
}

/* --- Tooltip Styles --- */
.tooltip {
	position: relative;
	display: inline-block;
	cursor: pointer;
}

.tooltip .tooltiptext {
	visibility: hidden;
	width: 160px;
	background-color: #555;
	color: #fff;
	font-size: 24px;
	font-weight: bold;
	border-radius: 6px;
	padding: 5px 0;
	position: absolute;
	z-index: 1;
	bottom: 125%;
	left: 50%;
	margin-left: -60px;
	opacity: 0;
	transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
	visibility: visible;
	opacity: 1;
}

/* --- Loading Overlay --- */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1001; /* Higher than modal */
    display: flex;
    justify-content: center;
    align-items: center;
}

.spinner {
    border: 8px solid #f3f3f3;
    border-top: 8px solid #3498db;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}