/* ===== VARIABLEN ===== */
:root {
    /* Farbpalette */
    --primary-color: #4a90e2;
    --primary-dark: #3a7bc8;
    --secondary-color: #7ed321;
    --secondary-dark: #6bc200;
    --danger-color: #e74c3c;
    --danger-dark: #c0392b;
    --warning-color: #f39c12;
    --warning-dark: #e67e22;
    --info-color: #3498db;
    
    /* Hintergründe */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    
    /* Text */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    /* Border */
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    
    /* Schatten */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    
    /* Abstände */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Animation */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ===== DARK MODE ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --border-color: #475569;
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.3);
    }
}

.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #475569;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.3);
}

/* ===== BASIS STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-normal);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== HEADER ===== */
header {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.connection-status {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: flex-end;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 2rem;
    border: 2px solid var(--border-color);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--danger-color);
    animation: pulse 2s infinite;
}

.status-dot.connected {
    background-color: var(--secondary-color);
    animation: none;
}

.status-text {
    font-weight: 600;
    font-size: 0.9rem;
}

.device-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: monospace;
    background-color: var(--bg-tertiary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-sm);
}

/* ===== MAIN CONTENT ===== */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ===== DASHBOARD GRID ===== */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

/* ===== SENSOR CARD ===== */
.sensor-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.sensor-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.card-header h2 {
    font-size: 1.4rem;
    color: var(--text-primary);
}

.btn-icon {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
}

/* ===== TEMPERATURE DISPLAY ===== */
.temperature-display {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin: var(--spacing-md) 0;
    gap: 0.5rem;
}

.temp-value {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
}

.temp-unit {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.temp-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.temp-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.temp-info .label {
    color: var(--text-muted);
}

.temp-info .value {
    font-weight: 600;
    color: var(--primary-color);
}

.temp-diff {
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
}

/* ===== LED STATUS ===== */
.led-status {
    display: flex;
    justify-content: space-around;
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.led-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.led-indicator {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    opacity: 0.3;
    transition: all var(--transition-fast);
    box-shadow: 0 0 0 rgba(0, 0, 0, 0);
}

.led-indicator.active {
    opacity: 1;
    box-shadow: 0 0 12px currentColor;
}

.led-indicator.green {
    background-color: var(--secondary-color);
}

.led-indicator.red {
    background-color: var(--danger-color);
}

.led-indicator.yellow {
    background-color: var(--warning-color);
}

.led-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ===== HEATER STATUS ===== */
.heater-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    border: 2px solid var(--border-color);
}

.heater-icon {
    font-size: 1.2rem;
}

.heater-text {
    font-weight: 600;
    font-size: 1rem;
}

/* ===== CONTROL SECTION ===== */
.control-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.control-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.control-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ===== CONTROL GROUP ===== */
.control-group {
    margin-bottom: var(--spacing-lg);
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.slider-value {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.1rem;
}

/* ===== SLIDER ===== */
.slider-container {
    position: relative;
    margin-bottom: var(--spacing-sm);
}

input[type="range"] {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    background: linear-gradient(to right, var(--danger-color), var(--warning-color), var(--secondary-color));
    border-radius: 4px;
    outline: none;
    margin: var(--spacing-sm) 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.slider-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ===== HYSTERESIS EXPLANATION ===== */
.hysteresis-explanation {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.hyst-visual {
    position: relative;
    height: 60px;
    margin: var(--spacing-md) 0;
}

.temp-scale {
    position: relative;
    height: 20px;
    background: linear-gradient(to right, var(--danger-color), var(--warning-color), var(--secondary-color));
    border-radius: 4px;
    margin-bottom: 30px;
}

.scale-mark {
    position: absolute;
    top: 25px;
    transform: translateX(-50%);
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.hyst-range {
    position: absolute;
    top: -5px;
    height: 30px;
    background-color: rgba(74, 144, 226, 0.2);
    border: 2px solid var(--primary-color);
    border-radius: 6px;
    transition: all var(--transition-normal);
}

.hyst-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--primary-color);
    color: white;
    padding: 0.1rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.hyst-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
}

.hyst-label-left, .hyst-label-right {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
}

.hyst-list {
    list-style: none;
    padding-left: 0;
}

.hyst-list li {
    padding: 0.3rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.hyst-list li strong {
    color: var(--text-primary);
}

/* ===== RADIO GROUP ===== */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
}

.radio-option {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.radio-option:hover {
    border-color: var(--primary-color);
    background-color: rgba(74, 144, 226, 0.05);
}

.radio-option input[type="radio"] {
    margin-right: var(--spacing-sm);
}

.radio-content {
    flex: 1;
}

.radio-title {
    font-weight: 600;
    color: var(--text-primary);
}

.radio-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.radio-option input[type="radio"]:checked + .radio-content .radio-title {
    color: var(--primary-color);
}

.priority-info {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.info-icon {
    font-size: 1rem;
}

/* ===== CONNECTION SECTION ===== */
.connection-section {
    grid-column: 1 / -1;
}

.connection-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.connection-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-primary);
    border-color: var(--primary-color);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-icon {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
}

/* ===== CONNECTION STATS ===== */
.connection-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.stat-value {
    font-weight: 600;
    font-family: monospace;
    color: var(--text-primary);
}

.connection-hint {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: rgba(52, 152, 219, 0.1);
    border: 1px solid var(--info-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
}

.hint-icon {
    font-size: 1.2rem;
}

.hint-text {
    color: var(--text-secondary);
}

.hint-text strong {
    color: var(--text-primary);
}

/* ===== LOG SECTION ===== */
.log-section {
    grid-column: 1 / -1;
}

.log-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

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

.log-output {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-md);
    height: 300px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    border: 2px solid var(--border-color);
}

.log-entry {
    padding: 0.5rem;
    margin-bottom: 0.25rem;
    border-radius: 4px;
    border-left: 4px solid transparent;
}

.log-entry.info {
    border-left-color: var(--info-color);
    background-color: rgba(52, 152, 219, 0.05);
}

.log-entry.success {
    border-left-color: var(--secondary-color);
    background-color: rgba(126, 211, 33, 0.05);
}

.log-entry.warning {
    border-left-color: var(--warning-color);
    background-color: rgba(243, 156, 18, 0.05);
}

.log-entry.error {
    border-left-color: var(--danger-color);
    background-color: rgba(231, 76, 60, 0.05);
}

.log-time {
    color: var(--text-muted);
    font-weight: 600;
    margin-right: 0.5rem;
}

.log-message {
    color: var(--text-primary);
}

.log-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--border-color);
}

.log-filter {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.log-stats {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===== FOOTER ===== */
footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.version {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 600;
}

.copyright {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: var(--spacing-sm);
}

.footer-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary-color);
    background-color: var(--bg-tertiary);
}

/* ===== MODALS ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.5rem;
    line-height: 1;
    border-radius: var(--border-radius-sm);
}

.modal-close:hover {
    background-color: var(--bg-tertiary);
    color: var(--danger-color);
}

/* ===== SHORTCUTS ===== */
.shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.shortcut-key {
    font-family: monospace;
    background-color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-weight: 600;
    color: var(--primary-color);
}

.shortcut-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== ANIMATIONS ===== */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .header-content {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .connection-status {
        align-items: center;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .control-section {
        grid-template-columns: 1fr;
    }
    
    .connection-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .temp-value {
        font-size: 2.5rem;
    }
    
    .led-status {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .connection-stats {
        grid-template-columns: 1fr;
    }
}

/* ===== UTILITY CLASSES ===== */
.hidden {
    display: none !important;
}

.text-success {
    color: var(--secondary-color);
}

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

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

.text-info {
    color: var(--info-color);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success {
    background-color: rgba(126, 211, 33, 0.2);
    color: var(--secondary-color);
}

.badge-warning {
    background-color: rgba(243, 156, 18, 0.2);
    color: var(--warning-color);
}

.badge-error {
    background-color: rgba(231, 76, 60, 0.2);
    color: var(--danger-color);
}

/* ===== LOADING STATES ===== */
.loading {
    position: relative;
    color: transparent !important;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}