* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-image: url('backgroundindex.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
    color: #333;
}

/* Background animasi dinonaktifkan */
.background {
    display: none;
}

.lab-elements {
    display: none;
}

.simulasi-header {
    background: rgba(255, 255, 255, 0.8); /* dari 0.95 jadi 0.8 (lebih transparan) */
    padding: 15px 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(5px);
}

.simulasi-header .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.back-btn {
    background: #74b9ff;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 10px;
    cursor: pointer;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    font-size: 1em;
}

.back-btn:hover {
    background: #0984e3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(116, 185, 255, 0.4);
}

.title h1 {
    color: #2d3436;
    font-size: 2em;
    text-align: center;
    margin-bottom: 5px;
}

.title p {
    color: #636e72;
    text-align: center;
    font-size: 1.1em;
}

.lab-container {
    max-width: 1400px;
    margin: 30px auto;
    padding: 0 20px;
}

.lab-bench {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 30px;
    min-height: 600px;
}

.simulation-area {
    background: rgba(255, 255, 255, 0.8); /* dari 0.95 jadi 0.8 (lebih transparan) */
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
}

.control-panel {
    background: rgba(255, 255, 255, 0.8); /* dari 0.95 jadi 0.8 (lebih transparan) */
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
}

.simulation-canvas-container {
    background: rgba(248, 249, 250, 0.8);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 25px;
    border: 3px solid #dfe6e9;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#simulationCanvas {
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

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

.control-group label {
    font-weight: bold;
    color: #2d3436;
    font-size: 0.95em;
}

.control-group input {
    padding: 12px;
    border: 2px solid #b2bec3;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s ease;
}

.control-group input:focus {
    outline: none;
    border-color: #74b9ff;
}

.buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.btn {
    padding: 15px;
    border: none;
    border-radius: 10px;
    font-size: 1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: #74b9ff;
    color: white;
}

.btn-primary:hover {
    background: #0984e3;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #636e72;
    color: white;
}

.btn-secondary:hover {
    background: #2d3436;
    transform: translateY(-2px);
}

.btn-success {
    background: #00b894;
    color: white;
}

.btn-success:hover {
    background: #00a085;
    transform: translateY(-2px);
}

.btn-danger {
    background: #d63031;
    color: white;
}

.btn-danger:hover {
    background: #c23616;
    transform: translateY(-2px);
}

.data-display {
    background: rgba(248, 249, 250, 0.8);
    border-radius: 15px;
    padding: 20px;
    margin-top: 20px;
}

.data-display h3 {
    color: #2d3436;
    margin-bottom: 15px;
    text-align: center;
    font-size: 1.2em;
}

.data-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #dfe6e9;
}

.data-label {
    font-weight: 600;
    color: #636e72;
}

.data-value {
    font-weight: bold;
    color: #0984e3;
    font-family: 'Courier New', monospace;
}

.unit {
    color: #636e72;
    font-size: 0.9em;
    margin-left: 5px;
}

.instruction-card {
    background: rgba(255, 255, 255, 0.75); /* dari 0.9 jadi 0.75 (lebih transparan) */
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    margin-top: 30px;
    border-left: 4px solid #74b9ff;
    backdrop-filter: blur(5px);
}

.instruction-card h3 {
    color: #2d3436;
    margin-bottom: 15px;
    text-align: center;
    font-size: 1.3em;
}

.instruction-card ol {
    text-align: left;
    padding-left: 20px;
}

.instruction-card li {
    margin-bottom: 12px;
    line-height: 1.5;
    color: #2d3436;
}

.instruction-card strong {
    color: #0984e3;
}

@media (max-width: 1024px) {
    .lab-bench {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .control-panel {
        order: -1;
    }
}

@media (max-width: 768px) {
    .simulasi-header .header-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .controls {
        grid-template-columns: 1fr;
    }
    
    .buttons {
        grid-template-columns: 1fr;
    }
    
    .lab-container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .simulation-canvas-container {
        padding: 15px;
        min-height: 300px;
    }
    
    .control-panel, .simulation-area {
        padding: 20px;
    }
    
    .title h1 {
        font-size: 1.6em;
    }
}