:root {
    /* Primary Colors */
    --primary-color: #1e88e5;
    --primary-dark: #1565c0;
    --primary-light: #42a5f5;
    --secondary-color: #f8f9fa;

    /* Status/Semantic Colors */
    --danger-color: #e53935;
    --warning-color: #ffa000;
    --success-color: #43a047;
    --info-color: #039be5;

    /* Base Colors */
    --dark-color: #212121;
    --light-color: #f8f9fa;

    /* Gray Scale */
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;

    /* Theme-aware colors (Light Mode defaults) */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-tertiary: #6c757d;
    --border-color: #e9ecef;
    --border-color-strong: #dee2e6;

    /* Alert backgrounds */
    --alert-danger-bg: #fef2f2;
    --alert-danger-border: #fee2e2;
    --alert-danger-text: #991b1b;
    --alert-warning-bg: #fffbeb;
    --alert-warning-border: #fef3c7;
    --alert-warning-text: #92400e;
    --alert-success-bg: #f0fdf4;
    --alert-success-border: #dcfce7;
    --alert-success-text: #166534;
    --alert-info-bg: #f0f7ff;
    --alert-info-border: #dbeafe;
    --alert-info-text: #1e3a8a;

    /* Status badge backgrounds */
    --status-online-bg: rgba(67, 160, 71, 0.1);
    --status-offline-bg: rgba(229, 57, 53, 0.1);
    --status-unknown-bg: rgba(255, 160, 0, 0.1);

    /* Control button colors */
    --control-btn-bg: #e0e0e0;
    --control-btn-color: #333333;
    --control-btn-disabled-bg: #f0f0f0;
    --control-btn-disabled-color: #aaaaaa;

    /* Header gradient */
    --header-gradient-start: #1e88e5;
    --header-gradient-end: #1565c0;
    --header-text-color: #ffffff;
    --header-glass-bg: rgba(255, 255, 255, 0.15);
    --header-glass-bg-hover: rgba(255, 255, 255, 0.25);

    /* Shadows */
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-header: 0 4px 20px rgba(0, 0, 0, 0.15);
}

/* Dark Mode Theme */
:root[data-theme="dark"] {
    /* Theme-aware colors (Dark Mode) */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #334155;
    --border-color-strong: #475569;

    /* Adjust semantic colors for dark mode */
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --success-color: #22c55e;
    --info-color: #3b82f6;
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;

    /* Gray scale inverted for dark mode */
    --gray-100: #1e293b;
    --gray-200: #334155;
    --gray-300: #475569;
    --gray-400: #64748b;
    --gray-500: #94a3b8;
    --gray-600: #cbd5e1;
    --gray-700: #e2e8f0;
    --gray-800: #f1f5f9;
    --gray-900: #f8fafc;

    /* Alert backgrounds for dark mode */
    --alert-danger-bg: rgba(239, 68, 68, 0.1);
    --alert-danger-border: rgba(239, 68, 68, 0.2);
    --alert-danger-text: #fca5a5;
    --alert-warning-bg: rgba(245, 158, 11, 0.1);
    --alert-warning-border: rgba(245, 158, 11, 0.2);
    --alert-warning-text: #fcd34d;
    --alert-success-bg: rgba(34, 197, 94, 0.1);
    --alert-success-border: rgba(34, 197, 94, 0.2);
    --alert-success-text: #86efac;
    --alert-info-bg: rgba(59, 130, 246, 0.1);
    --alert-info-border: rgba(59, 130, 246, 0.2);
    --alert-info-text: #93c5fd;

    /* Status badge backgrounds for dark mode */
    --status-online-bg: rgba(34, 197, 94, 0.15);
    --status-offline-bg: rgba(239, 68, 68, 0.15);
    --status-unknown-bg: rgba(245, 158, 11, 0.15);

    /* Control button colors for dark mode */
    --control-btn-bg: #334155;
    --control-btn-color: #e2e8f0;
    --control-btn-disabled-bg: #1e293b;
    --control-btn-disabled-color: #64748b;

    /* Header gradient for dark mode */
    --header-gradient-start: #1e3a8a;
    --header-gradient-end: #1e40af;
    --header-text-color: #f1f5f9;
    --header-glass-bg: rgba(255, 255, 255, 0.1);
    --header-glass-bg-hover: rgba(255, 255, 255, 0.15);

    /* Shadows for dark mode */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-header: 0 4px 20px rgba(0, 0, 0, 0.6);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}