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

:root {
    --primary-color: #3b82f6;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-bg: #0f172a;
    --darker-bg: #020617;
    --card-bg: #1e293b;
    --border-color: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --success-color: #22c55e;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.transformer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 20px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border-radius: 15px;
    border: 1px solid var(--border-color);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header .subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.visualization-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

@media (max-width: 1024px) {
    .visualization-layout {
        grid-template-columns: 1fr;
    }
}

.transformer-panel,
.analysis-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.transformer-display,
.flux-display,
.waveform-display,
.power-display {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.transformer-display h3,
.flux-display h3,
.waveform-display h3,
.power-display h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

canvas {
    width: 100%;
    height: 300px;
    background: var(--darker-bg);
    border-radius: 8px;
    display: block;
}

.transformer-info,
.flux-info,
.power-info {
    display: flex;
    justify-content: space-around;
    margin-top: 15px;
    padding: 15px;
    background: rgba(59, 130, 246, 0.05);
    border-radius: 8px;
}

.info-item {
    text-align: center;
}

.info-item span:first-child {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.waveform-legend {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 15px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.legend-color {
    width: 20px;
    height: 4px;
    border-radius: 2px;
}

.controls-panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.controls-panel h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 25px;
}

.control-group {
    background: rgba(59, 130, 246, 0.03);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.control-group h4 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--secondary-color);
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    margin-bottom: 15px;
    -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid var(--card-bg);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid var(--card-bg);
}

.control-group select {
    width: 100%;
    padding: 10px;
    background: var(--darker-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 15px;
    cursor: pointer;
}

.checkbox-input {
    margin-right: 8px;
    cursor: pointer;
}

.checkbox-input:checked {
    accent-color: var(--primary-color);
}

.button-group {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.control-button {
    flex: 1;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.control-button.start {
    background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
    color: white;
}

.control-button.start:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.control-button.pause {
    background: linear-gradient(135deg, var(--warning-color), #d97706);
    color: white;
}

.control-button.pause:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.control-button.reset {
    background: linear-gradient(135deg, var(--danger-color), #dc2626);
    color: white;
}

.control-button.reset:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.preset-btn {
    width: 100%;
    padding: 10px;
    margin-bottom: 8px;
    background: var(--primary-color);
    border: none;
    border-radius: 6px;
    color: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.preset-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
}

.formulas-section {
    background: rgba(59, 130, 246, 0.05);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.formulas-section h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.formula-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 12px;
}

.formula-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

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

.formula {
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    color: var(--text-primary);
    background: var(--darker-bg);
    padding: 8px 12px;
    border-radius: 4px;
    border-left: 3px solid var(--primary-color);
}

.losses-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.losses-section h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.losses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.loss-item {
    background: rgba(239, 68, 68, 0.05);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.loss-item h4 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--danger-color);
}

.loss-item canvas {
    height: 150px;
    margin-bottom: 15px;
}

.loss-value {
    text-align: center;
    padding: 10px;
    background: var(--darker-bg);
    border-radius: 6px;
}

.loss-value span:first-child {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.loss-value span:last-child {
    color: var(--danger-color);
    font-weight: bold;
    font-size: 1.1rem;
}

.explanation {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    border: 1px solid var(--border-color);
}

.explanation h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.explanation h3 {
    font-size: 1.3rem;
    margin: 25px 0 15px 0;
    color: var(--secondary-color);
}

.explanation p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 15px;
}

.explanation strong {
    color: var(--text-primary);
    font-weight: 600;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    header .subtitle {
        font-size: 1rem;
    }

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

    .button-group {
        flex-direction: column;
    }

    .formula-list {
        grid-template-columns: 1fr;
    }

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

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 5px rgba(59, 130, 246, 0.5);
    }
    50% {
        box-shadow: 0 0 20px rgba(59, 130, 246, 0.8);
    }
}

/* Status indicators */
.status-active {
    animation: pulse 2s ease-in-out infinite;
}

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

.status-inefficient {
    color: var(--warning-color);
}

/* Canvas responsiveness */
@media (max-width: 768px) {
    canvas {
        height: 200px;
    }
}