/* =============================================
   Katzen-Monitoring – Stylesheet
   Komplett responsive, rem-basiert, CSS Custom Properties
   ============================================= */

/* --- CSS Custom Properties --- */
:root {
    /* Farben – Hell */
    --color-primary: #4A90D9;
    --color-primary-dark: #357ABD;
    --color-primary-light: #E8F0FE;
    --color-secondary: #6C5CE7;
    --color-success: #00B894;
    --color-warning: #FDCB6E;
    --color-danger: #E17055;
    --color-info: #74B9FF;

    --color-bg: #F0F2F5;
    --color-surface: #FFFFFF;
    --color-surface-hover: #F8F9FA;
    --color-text: #2D3436;
    --color-text-secondary: #636E72;
    --color-text-muted: #B2BEC3;
    --color-border: #DFE6E9;
    --color-shadow: rgba(0, 0, 0, 0.08);

    --sidebar-bg: #2D3436;
    --sidebar-text: #DFE6E9;
    --sidebar-active: #4A90D9;
    --sidebar-width: 16rem;

    /* Schriftgroessen (ueberschreibbar per DB) */
    --font-size-base: 1rem;
    --font-size-h1: 2.25rem;
    --font-size-h2: 1.85rem;
    --font-size-h3: 1.5rem;
    --font-size-body: 1rem;
    --font-size-small: 0.875rem;

    /* Abstände */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Rundungen */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 50%;

    /* Uebergaenge */
    --transition: 0.2s ease;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
    --color-bg: #1A1A2E;
    --color-surface: #16213E;
    --color-surface-hover: #1A2744;
    --color-text: #E8E8E8;
    --color-text-secondary: #A0A0B0;
    --color-text-muted: #6C6C80;
    --color-border: #2A2A4A;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --sidebar-bg: #0F3460;
    --sidebar-text: #C0C0D0;
    --color-primary-light: #1A2744;
}

/* --- Reset & Basis --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: var(--font-size-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

h1 { font-size: var(--font-size-h1); font-weight: 700; line-height: 1.2; }
h2 { font-size: var(--font-size-h2); font-weight: 600; line-height: 1.3; }
h3 { font-size: var(--font-size-h3); font-weight: 600; line-height: 1.4; }
small, .text-small { font-size: var(--font-size-small); }
p { margin-bottom: var(--spacing-md); }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }

/* --- Login-Seite --- */
.page-login {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--spacing-md);
}

.login-container {
    width: 100%;
    max-width: 26rem;
}

.login-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: 0 1.25rem 3.75rem rgba(0,0,0,0.2);
    overflow: hidden;
}

.login-header {
    background: linear-gradient(135deg, #4A90D9, #6C5CE7);
    color: #fff;
    padding: var(--spacing-xl);
    text-align: center;
}

.login-header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.3rem;
    color: #fff;
}

.login-header p {
    opacity: 0.9;
    font-size: var(--font-size-small);
    margin: 0;
}

.login-logo {
    width: 4rem;
    height: 4rem;
    margin-bottom: var(--spacing-md);
}

.login-form {
    padding: var(--spacing-xl);
}

/* --- App Layout --- */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition);
    overflow-y: auto;
}

.sidebar-header {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo {
    width: 2.2rem;
    height: 2.2rem;
    flex-shrink: 0;
}

.sidebar-title {
    font-weight: 700;
    font-size: 1.1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-close {
    display: none;
    background: none;
    border: none;
    color: var(--sidebar-text);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: auto;
    padding: 0.3rem;
}

.sidebar-nav {
    list-style: none;
    padding: var(--spacing-md) 0;
    flex: 1;
}

.sidebar-nav li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem var(--spacing-lg);
    color: var(--sidebar-text);
    font-size: var(--font-size-body);
    font-weight: 500;
    transition: all var(--transition);
    border-left: 3px solid transparent;
}

.sidebar-nav li a:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
}

.sidebar-nav li a.active {
    background: rgba(74, 144, 217, 0.15);
    color: #fff;
    border-left-color: var(--sidebar-active);
}

.nav-icon {
    font-size: 1.2rem;
    width: 1.5rem;
    text-align: center;
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* --- Main Content --- */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- Topbar --- */
.topbar {
    background: var(--color-surface);
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 1px 3px var(--color-shadow);
}

.topbar-title {
    font-size: var(--font-size-h3);
    flex: 1;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.3rem;
    flex-direction: column;
    gap: 0.3rem;
}

.hamburger span {
    display: block;
    width: 1.5rem;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: var(--transition);
}

.user-badge {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    white-space: nowrap;
}

/* --- Content Area --- */
.content-area {
    padding: var(--spacing-xl);
    flex: 1;
}

/* --- Cards --- */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--color-shadow);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    transition: box-shadow var(--transition);
}

.card:hover {
    box-shadow: 0 4px 16px var(--color-shadow);
}

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

.card-header h3 {
    font-size: 1.1rem;
    margin: 0;
}

.card-body {
    padding: var(--spacing-lg);
}

.card-body-row {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.card-highlight {
    border-left: 4px solid var(--color-primary);
}

.card-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-small);
    font-weight: 600;
    background: var(--color-success);
    color: #fff;
}

/* --- Dashboard Grid --- */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
    gap: var(--spacing-lg);
}

.card-wide {
    grid-column: 1 / -1;
}

.card-small {
    min-width: 0;
}

/* --- Metriken --- */
.metric-large {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.1;
    margin-bottom: var(--spacing-xs);
}

.metric-medium {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.2;
    margin-bottom: var(--spacing-xs);
}

.metric-sub {
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
}

.label {
    font-weight: 600;
    color: var(--color-text-secondary);
}

/* --- Device Tabs --- */
.device-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: var(--spacing-xs);
}

.device-tab {
    padding: 0.5rem 1.2rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: var(--font-size-small);
    font-weight: 500;
    white-space: nowrap;
    transition: all var(--transition);
}

.device-tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.device-tab.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

/* Online-Status-Dot in den Geräte-Tabs */
.status-dot {
    display: inline-block;
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    margin-left: 0.4rem;
    vertical-align: middle;
    background: #636E72; /* default: unbekannt */
    flex-shrink: 0;
}
.status-dot[data-status="online"]  { background: #00B894; box-shadow: 0 0 4px #00B89480; }
.status-dot[data-status="delayed"] { background: #FDCB6E; }
.status-dot[data-status="offline"] { background: #E17055; }

/* --- Chart --- */
.chart-container {
    position: relative;
    width: 100%;
    height: 20rem;
}

.chart-controls {
    display: flex;
    gap: var(--spacing-sm);
}

/* --- Tabellen --- */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-small);
}

.data-table th,
.data-table td {
    padding: 0.75rem var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.data-table th {
    font-weight: 600;
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03rem;
    background: var(--color-surface-hover);
}

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

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }

/* --- Formulare --- */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.3rem;
    font-size: var(--font-size-small);
    color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.65rem 0.9rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-body);
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-group input:disabled {
    background: var(--color-surface-hover);
    cursor: not-allowed;
    opacity: 0.7;
}

.form-group small {
    display: block;
    margin-top: 0.2rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
    gap: var(--spacing-md);
}

.input-mono {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-small);
}

.input-copy-group {
    display: flex;
    gap: var(--spacing-sm);
}

.input-copy-group input {
    flex: 1;
}

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500 !important;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 1.1rem;
    height: 1.1rem;
    accent-color: var(--color-primary);
}

.select-small {
    padding: 0.35rem 0.6rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-small);
    background: var(--color-surface);
    color: var(--color-text);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.6rem 1.4rem;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-body);
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; }

.btn-success { background: var(--color-success); color: #fff; }
.btn-success:hover { background: #00a381; color: #fff; }

.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover { background: #c0392b; color: #fff; }

.btn-warning { background: var(--color-warning); color: #2D3436; }
.btn-warning:hover { background: #f0b93a; }

.btn-outline {
    background: transparent;
    border-color: var(--color-border);
    color: var(--color-text);
}
.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-block { display: flex; width: 100%; }
.btn-lg { padding: 0.8rem 2rem; font-size: 1.05rem; }
.btn-sm { padding: 0.35rem 0.8rem; font-size: var(--font-size-small); }

/* --- Alerts --- */
.alert {
    padding: 0.8rem var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-small);
    border: 1px solid;
}

.alert-danger { background: #ffeef0; color: #c0392b; border-color: #fab1ba; }
.alert-success { background: #e6fff8; color: #00a381; border-color: #b2f2e0; }
.alert-warning { background: #fff8e1; color: #8B6914; border-color: #ffe082; }
.alert-info { background: #e8f4fd; color: #2171b5; border-color: #90caf9; }

[data-theme="dark"] .alert-danger { background: #3a1520; color: #ff7675; }
[data-theme="dark"] .alert-success { background: #0a3020; color: #55efc4; }
[data-theme="dark"] .alert-warning { background: #3a3010; color: #ffeaa7; }
[data-theme="dark"] .alert-info { background: #102a40; color: #74b9ff; }

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: var(--spacing-md);
    backdrop-filter: blur(4px);
}

.modal {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 32rem;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 1.5rem 3rem rgba(0,0,0,0.2);
}

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

.modal-header h3 { margin: 0; }

.modal-close {
    background: none;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 0.2rem;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* --- Status & Badges --- */
.status-text {
    font-size: var(--font-size-small);
    margin-left: var(--spacing-sm);
    animation: fadeIn 0.3s ease;
}

.status-success { color: var(--color-success); }
.status-error { color: var(--color-danger); }

.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success { background: #e6fff8; color: #00a381; }
.badge-danger { background: #ffeef0; color: #c0392b; }
.badge-info { background: #e8f4fd; color: #2171b5; }

[data-theme="dark"] .badge-success { background: #0a3020; }
[data-theme="dark"] .badge-danger { background: #3a1520; }
[data-theme="dark"] .badge-info { background: #102a40; }

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.empty-state h2 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.empty-state p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

/* --- Settings & Profile --- */
.settings-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) 0;
}

.page-actions {
    display: flex;
    justify-content: flex-end;
    margin-bottom: var(--spacing-lg);
}

.font-preview {
    margin-top: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-surface-hover);
    border-radius: var(--radius-md);
    border: 1px dashed var(--color-border);
}

/* --- Sidebar Overlay (Mobile) --- */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
    display: none;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
    display: block;
}

/* --- Animations --- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

/* --- Toast Notifications --- */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-small);
    animation: slideInRight 0.3s ease;
    max-width: 24rem;
    border-left: 4px solid var(--color-primary);
}

.toast-success { border-left-color: var(--color-success); }
.toast-error { border-left-color: var(--color-danger); }
.toast-warning { border-left-color: var(--color-warning); }

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(2rem); }
    to { opacity: 1; transform: translateX(0); }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 0.5rem;
    height: 0.5rem;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-text-muted);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

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

/* Tablet */
@media (max-width: 64rem) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-close {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .hamburger {
        display: flex;
    }

    .dashboard-grid {
        grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
    }
}

/* Mobile */
@media (max-width: 40rem) {
    .content-area {
        padding: var(--spacing-md);
    }

    .topbar {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .topbar-title {
        font-size: 1.1rem;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .metric-large {
        font-size: 2.2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .chart-container {
        height: 15rem;
    }

    .modal {
        max-width: 100%;
        margin: var(--spacing-md);
    }

    .settings-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .page-actions {
        justify-content: stretch;
    }

    .page-actions .btn {
        width: 100%;
    }

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
    }

    .toast {
        max-width: 100%;
    }

    .user-badge {
        display: none;
    }

    .device-tabs {
        gap: 0.3rem;
    }

    .device-tab {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }

    .input-copy-group {
        flex-direction: column;
    }
}

/* Kleines Mobile */
@media (max-width: 22rem) {
    html {
        font-size: 14px;
    }
}

/* Print */
@media print {
    .sidebar, .topbar, .sidebar-overlay, .toast-container {
        display: none !important;
    }
    .main-content {
        margin-left: 0;
    }
}

/* ─── Kalibrierung ──────────────────────────────────────────── */
.modal-lg {
    max-width: 46rem;
}

.calibration-step h4 {
    margin: 0 0 0.6rem;
    font-size: 1rem;
    font-weight: 600;
}

.calibration-divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 1.2rem 0;
}

.calibration-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.info-block {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.6rem 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.info-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.info-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

@media (max-width: 30rem) {
    .calibration-info-grid { grid-template-columns: 1fr; }
    .modal-lg { max-width: 100%; }
}