/* Vanilla CSS for modern, premium look */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --success-hover: #059669;
    --surface: #ffffff;
    --background: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    margin: 0;
    padding: 2rem;
    line-height: 1.5;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.header-controls {
    display: flex; 
    gap: 1rem; 
    align-items: center;
}

h1 { 
    margin: 0; 
    font-weight: 600; 
    letter-spacing: -0.025em;
    color: #0f172a;
}

/* Table Styles */
.card {
    background: var(--surface);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th, td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

th {
    background-color: #f8fafc;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

tr:last-child td { border-bottom: none; }
tr:hover { background-color: #f8fafc; }

/* Button Styles */
.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    transition: opacity 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover { opacity: 0.9; }
.btn-danger { background: var(--danger); }
.btn-success { background: var(--success); }
.btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border);
}
.btn-outline:hover { background: #f1f5f9; opacity: 1; }

.action-group {
    display: flex;
    gap: 0.5rem;
}

/* Form Styles */
.form-group {
    margin-bottom: 1rem;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
}
.form-group input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 1rem;
}
.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.modal-overlay.active { 
    display: flex; 
    opacity: 1;
}

.modal-content {
    background: var(--surface);
    border-radius: 12px;
    width: 90vw;
    height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    transform: scale(0.95);
    transition: transform 0.2s ease;
}

.modal-content.small-modal {
    width: 400px;
    height: auto;
    max-height: 90vh;
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

.modal-title { 
    font-weight: 600; 
    font-size: 1.125rem; 
    color: var(--text-main);
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.2s;
}
.close-btn:hover { color: var(--text-main); }

iframe {
    flex-grow: 1;
    border: none;
    width: 100%;
    height: 100%;
    background: #f1f5f9;
}

/* Search Input */
.search-input {
    padding: 0.5rem 2rem 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    width: 250px;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}
.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.clear-search-btn {
    position: absolute;
    right: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}
.clear-search-btn:hover {
    color: var(--text-main);
}

/* Status Indicator */
.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}
.status-indicator.checking {
    background-color: #cbd5e1;
    animation: pulse 1.5s infinite;
}
@keyframes beaconPulse {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}
.status-indicator.online {
    background-color: var(--success);
    animation: beaconPulse 2s infinite;
}
.status-indicator.offline {
    background-color: var(--danger);
    box-shadow: 0 0 8px var(--danger);
}

@keyframes pulse {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

/* Dropdown Styles */
.dropdown {
    position: relative;
    display: inline-block;
}
.dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    background-color: var(--surface);
    min-width: 180px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    z-index: 10;
    border-radius: 6px;
    border: 1px solid var(--border);
    overflow: hidden;
}
.dropdown.show .dropdown-menu {
    display: block;
}
.dropdown-menu a {
    color: var(--text-main);
    padding: 0.75rem 1rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    transition: background-color 0.2s;
}
.dropdown-menu a:hover {
    background-color: var(--background);
}
.dropdown-menu a.text-danger {
    color: var(--danger);
}
.dropdown-menu a.text-danger:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

.device-link:hover {
    color: var(--primary) !important;
}
.device-link:hover i {
    opacity: 1 !important;
}

/* --- DARK THEME --- */
:root.dark {
    --surface: #1e293b;
    --background: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
}

:root.dark h1 { color: #f8fafc; }
:root.dark th { background-color: #0f172a; }
:root.dark tr:hover { background-color: #334155; }
:root.dark .modal-header { background: #1e293b; }
:root.dark iframe { background: #0f172a; }

:root.dark .search-input,
:root.dark .form-group input { 
    background: #0f172a; 
    color: #f8fafc; 
}
:root.dark .btn-outline { 
    border-color: #475569; 
    color: #f8fafc; 
}
:root.dark .btn-outline:hover { 
    background: #334155; 
}

/* --- RESPONSIVE / MOBILE --- */
@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    
    .header-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .header-controls {
        flex-wrap: wrap;
        justify-content: space-between;
    }
    
    .search-input {
        width: 100%;
        order: -1; /* Puts search bar at the top on mobile */
    }
    
    .card {
        overflow-x: auto; /* Enables horizontal scrolling for the table */
        -webkit-overflow-scrolling: touch;
    }
    
    .btn span {
        display: none; /* Hide button text on small screens if you decide to add text later */
    }
}