/**
 * PaxIoT - Stylesheet
 * 
 * Modernes, schlichtes Design für PAX IoT Dashboard
 * Ellwangen 2026
 */

/* ============================================
   Google Fonts Import
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Primärfarben - Elegantes Blau */
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-primary-bg: rgba(59, 130, 246, 0.08);
    
    /* Akzentfarben */
    --color-success: #10b981;
    --color-success-light: rgba(16, 185, 129, 0.1);
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-purple: #8b5cf6;
    
    /* Neutralfarben */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    
    /* Typografie */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;
    
    /* Abstände */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Radien */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-full: 9999px;
    
    /* Schatten */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.05);
    --shadow-xl: 0 20px 40px -10px rgb(0 0 0 / 0.15);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.15);
    
    /* Übergänge */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ============================================
   Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-gray-700);
    background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--spacing-md) 0;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-gray-800);
    letter-spacing: -0.02em;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.25rem; font-weight: 600; }
h3 { font-size: 1.125rem; }

p {
    margin: 0 0 var(--spacing-md) 0;
}

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

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

/* ============================================
   Layout
   ============================================ */
.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================
   Header
   ============================================ */
.header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-gray-900);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header h1 .logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-md);
    position: relative;
}

.header h1 .logo-icon::after {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-white);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.85); }
}

.header h1 .logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.header h1 .logo-text .title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-gray-900);
}

.header h1 .logo-text .subtitle {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-gray-400);
    letter-spacing: 0.05em;
}

.header nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header nav a {
    color: var(--color-gray-500);
    font-weight: 500;
    font-size: 0.875rem;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.header nav a:hover {
    color: var(--color-primary);
    background: var(--color-primary-bg);
}

.header nav a.active {
    color: var(--color-primary);
    background: var(--color-primary-bg);
}

.nav-separator {
    color: var(--color-gray-300);
    font-weight: 300;
}

/* ============================================
   Main Content
   ============================================ */
main.container {
    padding-top: var(--spacing-2xl);
    padding-bottom: var(--spacing-3xl);
}

/* ============================================
   Page Title
   ============================================ */
.page-intro {
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.page-intro h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.page-intro p {
    color: var(--color-gray-500);
    margin: 0;
    font-size: 1rem;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border: 1px solid rgba(226, 232, 240, 0.6);
    transition: all var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-100);
}

.card-header h2 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-800);
}

/* ============================================
   Stats Grid
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    border: 1px solid rgba(226, 232, 240, 0.6);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

/* Aktiv (24h) - Lila */
.stat-card:nth-child(2)::before {
    background: linear-gradient(90deg, var(--color-purple) 0%, #a78bfa 100%);
}

/* Aktuelle Besucher (PAX) - Grün */
.stat-card:nth-child(3)::before {
    background: linear-gradient(90deg, var(--color-success) 0%, #34d399 100%);
}

.stat-card:nth-child(4)::before {
    background: linear-gradient(90deg, var(--color-warning) 0%, #fbbf24 100%);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    background: var(--color-primary-bg);
}

.stat-value {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--color-gray-900);
    line-height: 1;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   Tables
   ============================================ */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 calc(var(--spacing-xl) * -1);
    padding: 0 var(--spacing-xl);
}

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.875rem;
}

.data-table th,
.data-table td {
    padding: var(--spacing-md) var(--spacing-md);
    text-align: left;
}

.data-table th {
    font-weight: 600;
    font-size: 0.6875rem;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: var(--color-gray-50);
    border-top: 1px solid var(--color-gray-100);
    border-bottom: 1px solid var(--color-gray-100);
    white-space: nowrap;
}

.data-table th:first-child {
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    border-left: 1px solid var(--color-gray-100);
}

.data-table th:last-child {
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    border-right: 1px solid var(--color-gray-100);
}

.data-table td {
    border-bottom: 1px solid var(--color-gray-100);
    color: var(--color-gray-700);
}

.data-table tbody tr {
    transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
    background: var(--color-gray-50);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table .text-right {
    text-align: right;
}

.data-table strong {
    color: var(--color-gray-900);
    font-weight: 600;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8125rem;
    border-radius: var(--radius-md);
    box-shadow: none;
}

.btn-small:not(.active) {
    background: transparent;
    color: var(--color-gray-600);
}

.btn-small:not(.active):hover {
    background: var(--color-gray-100);
    transform: none;
}

.btn-small.active {
    background: var(--color-white);
    color: var(--color-gray-900);
    box-shadow: var(--shadow-sm);
}

.period-selector {
    display: flex;
    gap: 2px;
    background: var(--color-gray-100);
    padding: 4px;
    border-radius: var(--radius-lg);
}

.period-selector .btn-small {
    border-radius: var(--radius-md);
}

/* ============================================
   Status Indicators
   ============================================ */
.status-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: var(--spacing-sm);
    position: relative;
}

.status-dot.active {
    background: var(--color-success);
    box-shadow: 0 0 0 3px var(--color-success-light);
}

.status-dot.active::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 2px solid var(--color-success);
    animation: ripple 2s ease-out infinite;
    opacity: 0.6;
}

@keyframes ripple {
    0% { transform: scale(0.8); opacity: 0.6; }
    100% { transform: scale(1.6); opacity: 0; }
}

.status-dot.inactive {
    background: var(--color-gray-300);
}

.battery {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    background: var(--color-success-light);
    color: var(--color-success);
}

.battery.low {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
}

/* ============================================
   Charts
   ============================================ */
.chart-container {
    position: relative;
    height: 300px;
    margin-top: var(--spacing-md);
}

.chart-container.chart-large {
    height: 400px;
}

/* ============================================
   Sensor Detail
   ============================================ */
.sensor-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.sensor-header h2 {
    margin: 0;
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    color: var(--color-gray-900);
}

.sensor-header .text-muted {
    margin-top: var(--spacing-sm);
}

.sensor-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-xl);
    color: var(--color-gray-400);
}

.empty-state::before {
    content: '📡';
    display: block;
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    filter: grayscale(0.5);
}

.empty-state small {
    display: block;
    margin-top: var(--spacing-sm);
    color: var(--color-gray-400);
}

/* ============================================
   Utilities
   ============================================ */
.text-muted {
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

.text-right {
    text-align: right;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-white);
    border-top: 1px solid var(--color-gray-200);
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-top: auto;
}

.footer p {
    margin: 0;
    font-size: 0.75rem;
    color: var(--color-gray-400);
}

.footer a {
    color: var(--color-gray-500);
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--color-primary);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .header nav {
        width: 100%;
        justify-content: flex-start;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .stat-card {
        padding: var(--spacing-lg);
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .card {
        padding: var(--spacing-lg);
        border-radius: var(--radius-xl);
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .sensor-header {
        flex-direction: column;
    }
    
    .chart-container,
    .chart-container.chart-large {
        height: 250px;
    }
    
    .table-responsive {
        margin: 0 calc(var(--spacing-lg) * -1);
        padding: 0 var(--spacing-lg);
    }
    
    .page-intro h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .header h1 .logo-text .title {
        font-size: 0.9375rem;
    }
    
    .stat-value {
        font-size: 1.75rem;
    }
    
    main.container {
        padding-top: var(--spacing-xl);
    }
}