:root {
    /* New Inviting Palette - Modern Teal/Cyan */
    --primary-color: #00897b; /* A warm, inviting teal */
    --primary-dark: #005b4f;  /* Darker shade for contrast/hover */
    --primary-light: #e0f2f1; /* Very light teal for accents */
    
    --bg-color: #f0f4f3; /* Slightly warmer light grey background */
    --text-color: #2c3e50; /* Dark slate for softer text than pure black */
    --white: #ffffff;
    --border-color: #e1e8e6;
    
    /* Status Colors - Kept standard for clarity, tweaked slightly */
    --status-ok-bg: #c8e6c9;
    --status-ok-text: #256029;
    --status-warn-bg: #fff3cd;
    --status-warn-text: #856404;
    --status-crit-bg: #ffcdd2;
    --status-crit-text: #c62828;
}

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

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header - Updated with gradient and modern feel */
.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 1.5rem 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.app-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.app-header p {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Controls Section - Card style */
.controls-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 30px 0 20px;
    background: var(--white);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.filter-group label {
    font-weight: 600;
    margin-right: 12px;
    color: var(--primary-dark);
}

.filter-group select {
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-color);
    outline: none;
    transition: border-color 0.3s;
}

.filter-group select:focus {
    border-color: var(--primary-color);
}

.legend {
    display: flex;
    gap: 12px;
}

.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Table Styling - Cleaner and more modern */
.table-responsive {
    overflow-x: auto;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: separate; /* Required for border-radius on rows/headers */
    border-spacing: 0;
    min-width: 900px;
}

th, td {
    padding: 16px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    /* Using light accent color for headers */
    background-color: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

/* Subtle hover effect on rows */
tr:hover td {
    background-color: #f8fcfb;
}

/* Make device name stand out */
td strong {
    color: var(--primary-dark);
    font-weight: 600;
}

/* Action Button Styling */
.btn-inspect {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
    transition: all 0.3s ease;
}

.btn-inspect:hover {
    background-color: var(--primary-dark);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transform: translateY(-1px);
}

.btn-inspect:active {
    transform: translateY(0);
    box-shadow: 0 2px 3px rgba(0,0,0,0.15);
}

/* Status Classes */
.ok-status {
    background-color: var(--status-ok-bg);
    color: var(--status-ok-text);
}

.due-soon {
    background-color: var(--status-warn-bg);
    color: var(--status-warn-text);
}

.overdue {
    background-color: var(--status-crit-bg);
    color: var(--status-crit-text);
    /* Add a subtle border to pop overdue items */
    border: 2px solid rgba(198, 40, 40, 0.3); 
    animation: pulse-red 2s infinite;
}

/* Footer */
.app-footer {
    margin-top: 40px;
    text-align: center;
    padding: 30px 20px;
    color: #888;
    font-size: 0.9rem;
}

/* Animation Keyframes (unchanged but effective) */
@keyframes pulse-red {
    0% {
        box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.5);
    }
    70% {
        box-shadow: 0 0 0 8px rgba(220, 53, 69, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(220, 53, 69, 0);
    }
}