:root {
    --bg-dark: #2d2d2d;
    --bg-panel: #f5f5f5;
    --bg-card: #ffffff;
    --text-dark: #333333;
    --text-light: #ffffff;
    --text-muted: #666666;
    --accent: #4a90e2;
    --accent-hover: #357abd;
    --success: #28a745;
    --success-hover: #218838;
    --warning: #ffc107;
    --error: #dc3545;
    --error-hover: #c82333;
    --border: #dee2e6;
    --radius: 6px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-dark);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 15px 20px;
    background: var(--bg-panel);
    border-radius: var(--radius);
    border-left: 4px solid var(--accent);
}

header h1 {
    font-size: 20px;
    color: var(--accent);
    font-weight: bold;
}

.header-controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

.lang-select {
    background: white;
    color: var(--text-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 12px;
    cursor: pointer;
    font-size: 13px;
}

.status-badge {
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
}

.status-badge.connected {
    background: rgba(40, 167, 69, 0.15);
    color: var(--success);
    border: 1px solid var(--success);
}

.status-badge.disconnected {
    background: rgba(220, 53, 69, 0.15);
    color: var(--error);
    border: 1px solid var(--error);
}

.status-badge.busy {
    background: rgba(255, 193, 7, 0.15);
    color: #856404;
    border: 1px solid var(--warning);
}

/* Panels */
.panel {
    background: var(--bg-panel);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    transition: all 0.2s;
}

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

.panel h2 {
    font-size: 16px;
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
    color: var(--text-dark);
}

.panel h3 {
    font-size: 14px;
    margin-bottom: 10px;
    color: var(--text-muted);
}

/* Connection */
.auto-connect-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: white;
    border-radius: var(--radius);
    margin-top: 10px;
    font-size: 13px;
}

.connect-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--error);
    animation: pulse 1.5s infinite;
}

.connect-indicator.connected {
    background: var(--success);
    animation: none;
}

.connect-indicator.disconnected {
    background: var(--error);
    animation: pulse 1.5s infinite;
}

.connection-info {
    margin-bottom: 10px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 12px;
    background: white;
    border-radius: 4px;
    margin-bottom: 4px;
}

.info-row .label {
    color: var(--text-muted);
    font-size: 13px;
}

.info-row .value {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 13px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.tab {
    padding: 10px 18px;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s;
}

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

.tab.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    font-weight: bold;
}

.tab:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.tab-panel.hidden {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* Forms */
.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
}

.form-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 180px;
}

.form-control {
    width: 100%;
    padding: 8px 12px;
    background: white;
    color: var(--text-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.15);
}

select.form-control {
    cursor: pointer;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--accent);
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 4px;
}

.validation-hint {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
    opacity: 0.7;
}

.form-control:invalid {
    border-color: var(--error);
    box-shadow: 0 0 0 2px rgba(220, 53, 69, 0.15);
}

/* Buttons */
.button-group {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #3498db);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-hover), #2980b9);
    transform: translateY(-1px);
}

.btn-secondary {
    background: white;
    color: var(--text-dark);
    border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background: #e9ecef;
    border-color: var(--accent);
}

.btn-auto {
    background: white;
    color: var(--accent);
    border: 2px solid var(--accent);
    font-weight: bold;
}

.btn-auto:hover {
    background: var(--accent);
    color: white;
}

.btn-auto.active {
    background: var(--accent);
    color: white;
}

.btn-small {
    padding: 5px 14px;
    font-size: 11px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Section divider */
.section-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 20px 0;
}

/* Auto mode */
.auto-mode-section {
    margin-top: 20px;
    padding: 15px;
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.auto-mode-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.auto-mode-status {
    margin-top: 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
}

.auto-mode-status.active {
    color: var(--accent);
}

/* Statistics */
.stats-section {
    margin-top: 20px;
    padding: 15px;
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.stats-container {
    background: #f8f9fa;
    border-radius: var(--radius);
    padding: 10px;
    margin-top: 8px;
    max-height: 200px;
    overflow-y: auto;
}

.stats-container pre {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 12px;
    margin: 0;
    white-space: pre-wrap;
}

/* Sensors Monitor */
.sensors-monitor {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
}

.sensor-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 14px;
    background: white;
    border-radius: 4px;
    border: 1px solid var(--border);
}

.sensor-row .label {
    color: var(--text-muted);
    font-size: 13px;
}

.sensor-row .value {
    font-weight: 600;
    color: var(--accent);
    font-size: 14px;
}

/* Log */
.log-section {
    margin-top: 16px;
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
}

.log-header h3 {
    margin-bottom: 0;
}

.log-toggle-icon {
    font-size: 0.8em;
    margin-left: 10px;
}

.log-container {
    background: #1a1a1a;
    border-radius: var(--radius);
    padding: 12px;
    max-height: 300px;
    overflow-y: auto;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 11px;
}

.log-entry {
    padding: 4px 8px;
    margin: 2px 0;
    border-radius: 3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 0;
}

.log-entry.info {
    background: #3a3a3a;
    color: #d4d4d4;
}

.log-entry.warning {
    background: #665500;
    color: #ffd700;
}

.log-entry.error {
    background: #662222;
    color: #ff6b6b;
}

.log-entry.success {
    background: #1a3a1a;
    color: #4caf50;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.log-entry:last-child {
    animation: fadeIn 0.3s ease-out;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.3; }
    100% { opacity: 1; }
}

/* Footer */
.footer {
    margin-top: 20px;
    padding: 20px;
    background: var(--bg-panel);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
}

.footer-link:hover {
    color: var(--accent);
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--text-muted);
    font-size: 12px;
}

.footer-copy {
    font-weight: 500;
}

.footer-desc {
    opacity: 0.7;
}

.subsection {
    margin-bottom: 16px;
}

/* Responsive */
@media (max-width: 700px) {
    .container { padding: 10px; }
    header { flex-direction: column; gap: 10px; text-align: center; }
    .header-controls { flex-direction: column; gap: 8px; }
    .button-group { flex-direction: column; }
    .btn { width: 100%; }
    .form-row { flex-direction: column; }
    .tabs { justify-content: center; }
    .tab { font-size: 12px; padding: 8px 12px; }
    .sensors-monitor { grid-template-columns: 1fr 1fr; }
    .log-entry { white-space: normal; word-break: break-all; }
}