/**
 * TuerSmart v2.3 - Base Styles
 * =============================
 * CSS Reset, Variables, Grid System
 * 
 * @author IBKuehne
 * @date 2025-11-24 05:04:00 UTC
 */

/* ========================================
   CSS RESET
   ======================================== */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ========================================
   CSS VARIABLES
   ======================================== */

:root {
    /* Primary Colors */
    --primary: #667eea;
    --primary-dark: #5568d3;
    --primary-light: #7c93f0;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* Status Colors */
    --success: #22c55e;
    --success-light: #d1fae5;
    --error: #ef4444;
    --error-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --info: #3b82f6;
    --info-light: #dbeafe;
    
    /* Neutral Colors */
    --white: #ffffff;
    --black: #000000;
    --text: #1e293b;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --background: #f8fafc;
    --background-alt: #ffffff;
    
    /* Device Status Colors */
    --status-online: #22c55e;
    --status-warning: #f59e0b;
    --status-offline: #ef4444;
    --status-never: #94a3b8;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.3);
    
    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    
    /* Border Radius */
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 15px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Font Sizes */
    --text-xs: 12px;
    --text-sm: 14px;
    --text-base: 16px;
    --text-lg: 18px;
    --text-xl: 20px;
    --text-2xl: 24px;
    --text-3xl: 32px;
    --text-4xl: 40px;
    
    /* Z-Index Layers */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text);
}

h1 { font-size: var(--text-3xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--text-2xl); margin-bottom: var(--space-5); }
h3 { font-size: var(--text-xl); margin-bottom: var(--space-4); }
h4 { font-size: var(--text-lg); margin-bottom: var(--space-3); }
h5 { font-size: var(--text-base); margin-bottom: var(--space-3); }
h6 { font-size: var(--text-sm); margin-bottom: var(--space-2); }

p {
    margin-bottom: var(--space-4);
    color: var(--text);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

strong, b {
    font-weight: 600;
}

small {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* ========================================
   LAYOUT UTILITIES
   ======================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.container-sm {
    max-width: 600px;
}

.container-lg {
    max-width: 1400px;
}

/* Flexbox Utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* Grid Utilities */
.grid {
    display: grid;
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Spacing Utilities */
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

/* Text Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-muted { color: var(--text-muted); }
.text-error { color: var(--error); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }

.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }

.font-normal { font-weight: 400; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* Display Utilities */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* ========================================
   RESPONSIVE BREAKPOINTS
   ======================================== */

/* Mobile: 320px - 767px (default) */

/* Tablet: 768px+ */
@media (min-width: 768px) {
    .grid-cols-md-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-cols-md-3 { grid-template-columns: repeat(3, 1fr); }
    
    h1 { font-size: var(--text-4xl); }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
    .grid-cols-lg-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-cols-lg-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Large Desktop: 1440px+ */
@media (min-width: 1440px) {
    .container {
        padding: 0 var(--space-8);
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* Focus Styles */
:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Skip to Content Link (for screen readers) */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary);
    color: white;
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    z-index: 100;
}

.skip-to-content:focus {
    top: 0;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}