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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: linear-gradient(135deg, #007acc, #005a99);
    color: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.panel {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 25px;
    overflow: hidden;
}

.panel-header {
    background: #007acc;
    color: white;
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
}

.panel-header h2 {
    font-size: 1.5rem;
    font-weight: 500;
}

.panel-body {
    padding: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 200px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

textarea, select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
}

textarea {
    min-height: 120px;
    resize: vertical;
}

#codeEditor {
    min-height: 300px;
    font-family: 'Courier New', monospace;
    background-color: #f8f8f8;
}

/* CodeMirror styling */
.CodeMirror {
    height: auto;
    min-height: 300px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.CodeMirror-scroll {
    min-height: 300px;
}

.serial-output, .error-output {
    min-height: 150px;
    max-height: 300px;
    overflow-y: auto;
    padding: 15px;
    background-color: #f8f8f8;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    white-space: pre-wrap;
}

.error-output {
    background-color: #fff5f5;
    border-color: #fcc;
    color: #c33;
}

.btn-primary, .btn-secondary, .btn-danger {
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.3s;
    min-width: 120px;
}

.btn-primary {
    background-color: #007acc;
    color: white;
}

.btn-primary:hover {
    background-color: #005a99;
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-danger {
    background-color: #dc3545;
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
}

.device-connection {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.device-connection button {
    flex: 1;
    min-width: 120px;
}

.editor-actions, .serial-actions, .error-actions {
    margin-top: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.editor-actions button, .serial-actions button, .error-actions button {
    flex: 1;
    min-width: 100px;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
        gap: 15px;
    }
    
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    .panel-body {
        padding: 15px;
    }
    
    .btn-primary, .btn-secondary, .btn-danger {
        padding: 10px 15px;
        font-size: 0.9rem;
        min-width: 100px;
    }
    
    .device-connection {
        flex-direction: column;
    }
    
    .device-connection button {
        width: 100%;
    }
    
    .editor-actions, .serial-actions, .error-actions {
        flex-direction: column;
    }
    
    .editor-actions button, .serial-actions button, .error-actions button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    header {
        padding: 15px 10px;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .panel-header h2 {
        font-size: 1.2rem;
    }
    
    .panel-body {
        padding: 10px;
    }
    
    label {
        font-size: 0.9rem;
    }
    
    textarea, select {
        font-size: 0.9rem;
        padding: 10px;
    }
}