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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #06d6a0;
    --accent: #f59e0b;
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #10b981;
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --dark-border: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --gradient-card: linear-gradient(145deg, #1e293b, #0f172a);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: var(--dark-card);
    padding: 25px;
    border-radius: 20px;
    margin-bottom: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--dark-border);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.header h1 {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 2.5rem;
    font-weight: 700;
}

.status {
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 600;
    background: var(--danger);
    color: white;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
    transition: all 0.3s ease;
}

.status.connected {
    background: var(--success);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

/* Dashboard */
.dashboard {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

/* Statistics */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--gradient-card);
    padding: 25px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--dark-border);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary);
}

.stat-card h3 {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.95rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons - Modern Attractive */
.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 140px;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: white;
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-success:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.6);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #dc2626);
    color: white;
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

.btn-danger:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.6);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning), #d97706);
    color: white;
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

.btn-warning:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.6);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.6);
}

/* Controls */
.controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Panels */
.tuning-panel,
.motor-control-panel,
.stress-test-panel,
.chart-container {
    background: var(--gradient-card);
    padding: 25px;
    border-radius: 16px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--dark-border);
    transition: all 0.3s ease;
    position: relative;
}

.tuning-panel:hover,
.motor-control-panel:hover,
.stress-test-panel:hover,
.chart-container:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.tuning-panel::before,
.motor-control-panel::before,
.stress-test-panel::before,
.chart-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 16px 16px 0 0;
}

.tuning-panel h3,
.motor-control-panel h3,
.stress-test-panel h3,
.chart-container h3 {
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.4rem;
    font-weight: 600;
}

/* Input Groups */
.input-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding: 10px 0;
}

.input-group label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.input-group input {
    width: 120px;
    padding: 12px;
    border: 2px solid var(--dark-border);
    border-radius: 8px;
    text-align: center;
    font-size: 1rem;
    background: var(--dark-bg);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.input-group input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Radio and Checkbox Groups */
.radio-group {
    display: flex;
    gap: 20px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.radio-group label:hover {
    color: var(--text-primary);
}

.radio-group input[type="radio"] {
    accent-color: var(--primary);
    transform: scale(1.2);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s ease;
    padding: 8px 12px;
    border-radius: 8px;
    background: rgba(30, 41, 59, 0.5);
}

.checkbox-group label:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.1);
}

.checkbox-group input[type="checkbox"] {
    accent-color: var(--primary);
    transform: scale(1.2);
}

/* Chart */
#errorChart {
    width: 100%;
    height: 200px;
    background: var(--dark-bg);
    border-radius: 12px;
    border: 1px solid var(--dark-border);
}

/* Stress Test Specific Styles */
.stress-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
    margin: 20px 0;
    padding: 20px;
    background: var(--dark-bg);
    border-radius: 12px;
    border: 1px solid var(--dark-border);
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.info-item span:first-child {
    font-weight: 600;
    color: var(--text-secondary);
}

.info-item span:last-child {
    font-weight: bold;
    color: var(--primary);
    font-size: 1.1rem;
}

.stress-controls {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.stress-progress {
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 24px;
    background: var(--dark-bg);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 12px;
    border: 1px solid var(--dark-border);
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    width: 0%;
    transition: width 0.5s ease;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

#stressStatus {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-align: center;
    display: block;
}

/* Test Results */
.test-results {
    margin-top: 20px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(6, 214, 160, 0.1));
    border-radius: 12px;
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-left: 4px solid var(--success);
}

.test-results h4 {
    margin-bottom: 15px;
    color: var(--success);
    font-size: 1.2rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid rgba(16, 185, 129, 0.2);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item span:first-child {
    color: var(--text-secondary);
    font-weight: 500;
}

.result-item span:last-child {
    color: var(--success);
    font-weight: 600;
    font-size: 1.1rem;
}

/* Active Test Button */
.btn-test-active {
    background: linear-gradient(135deg, var(--danger), #dc2626) !important;
    animation: pulse-glow 1.5s infinite;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.6) !important;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(239, 68, 68, 0.6);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 30px rgba(239, 68, 68, 0.8);
        transform: scale(1.02);
    }
}

/* Countdown Animation */
.countdown-animation {
    animation: countdown-pulse 1s infinite;
    color: var(--danger) !important;
    font-weight: 700;
}

@keyframes countdown-pulse {
    0%, 100% {
        transform: scale(1);
        text-shadow: 0 0 10px rgba(239, 68, 68, 0.5);
    }
    50% {
        transform: scale(1.1);
        text-shadow: 0 0 20px rgba(239, 68, 68, 0.8);
    }
}

/* Progress Bar States */
.progress-fill.test-running {
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.progress-fill.test-complete {
    background: linear-gradient(90deg, var(--success), #059669);
}

.progress-fill.test-error {
    background: linear-gradient(90deg, var(--danger), #dc2626);
}

/* Configuration Panel */
.config-panel {
    background: var(--gradient-card);
    padding: 25px;
    border-radius: 16px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--dark-border);
    margin-bottom: 25px;
    position: relative;
}

.config-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--warning));
    border-radius: 16px 16px 0 0;
}

.config-panel h3 {
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--accent), var(--warning));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.4rem;
    font-weight: 600;
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.config-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.config-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.config-select {
    padding: 12px;
    border: 2px solid var(--dark-border);
    border-radius: 8px;
    background: var(--dark-bg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.config-select:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.config-select:hover {
    border-color: var(--primary-light);
}

/* Custom Radio and Checkbox */
.radio-custom {
    width: 18px;
    height: 18px;
    border: 2px solid var(--dark-border);
    border-radius: 50%;
    display: inline-block;
    position: relative;
    margin-right: 8px;
    transition: all 0.3s ease;
}

input[type="radio"]:checked + .radio-custom {
    border-color: var(--primary);
    background: var(--primary);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

input[type="radio"]:checked + .radio-custom::after {
    content: '';
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.checkbox-custom {
    width: 18px;
    height: 18px;
    border: 2px solid var(--dark-border);
    border-radius: 4px;
    display: inline-block;
    position: relative;
    margin-right: 8px;
    transition: all 0.3s ease;
}

input[type="checkbox"]:checked + .checkbox-custom {
    border-color: var(--primary);
    background: var(--primary);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

input[type="checkbox"]:checked + .checkbox-custom::after {
    content: '✓';
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
    font-weight: bold;
}

/* Sliders */
.speed-slider {
    width: 150px;
    height: 6px;
    border-radius: 3px;
    background: var(--dark-border);
    outline: none;
    -webkit-appearance: none;
}

.speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
    transition: all 0.3s ease;
}

.speed-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.8);
}

.pid-slider-container {
    margin-top: 8px;
}

.pid-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--dark-border);
    outline: none;
    -webkit-appearance: none;
}

.pid-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--secondary);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(6, 214, 160, 0.5);
    transition: all 0.3s ease;
}

.pid-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 12px rgba(6, 214, 160, 0.8);
}

/* PID Controls */
.pid-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.pid-group {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 10px;
    background: rgba(30, 41, 59, 0.5);
    border-radius: 8px;
    border: 1px solid var(--dark-border);
}

.pid-group label {
    min-width: 80px;
    font-weight: 600;
    color: var(--text-secondary);
}

.pid-group input[type="number"] {
    width: 80px;
    padding: 8px;
    border: 2px solid var(--dark-border);
    border-radius: 6px;
    text-align: center;
    background: var(--dark-bg);
    color: var(--text-primary);
}

/* Additional Stats */
.stat-card:nth-child(4) .value {
    background: linear-gradient(135deg, var(--accent), var(--warning));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Enhanced Info Items */
.info-item span:last-child {
    font-weight: bold;
    color: var(--primary);
    font-size: 1.1rem;
}

.info-item:nth-child(3) span:last-child {
    color: var(--accent);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
        padding: 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .stats {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .controls {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 250px;
    }
    
    .radio-group {
        flex-direction: column;
        gap: 12px;
    }
    
    .stress-controls {
        flex-direction: column;
    }
    
    .stress-info {
        grid-template-columns: 1fr;
    }
    
    .input-group {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }
    
    .input-group input {
        width: 100%;
        max-width: 200px;
    }
    
    .config-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .pid-group {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }
    
    .pid-group label {
        min-width: auto;
    }
    
    .speed-slider {
        width: 100%;
        max-width: 200px;
    }
}

/* Smooth Animations */
@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes slideIn {
    from { 
        transform: translateX(100%); 
        opacity: 0; 
    }
    to { 
        transform: translateX(0); 
        opacity: 1; 
    }
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 25px;
    right: 25px;
    padding: 18px 24px;
    border-radius: 12px;
    color: white;
    font-weight: 600;
    z-index: 1000;
    animation: slideIn 0.4s ease-out;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    border-left: 4px solid;
    backdrop-filter: blur(10px);
}

.notification.success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.9), rgba(6, 214, 160, 0.9));
    border-left-color: var(--success);
}

.notification.error {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.9), rgba(220, 38, 38, 0.9));
    border-left-color: var(--danger);
}

.notification.warning {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.9), rgba(217, 119, 6, 0.9));
    border-left-color: var(--warning);
}

.notification.info {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.9), rgba(79, 70, 229, 0.9));
    border-left-color: var(--primary);
}

/* Animation for configuration changes */
.config-select:focus {
    animation: pulse-select 0.5s ease-in-out;
}

@keyframes pulse-select {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* Status indicators for configuration */
.config-status {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-left: 8px;
    background: var(--success);
    animation: pulse 2s infinite;
}

.config-status.pending {
    background: var(--warning);
}

.config-status.error {
    background: var(--danger);
}