body {
    font-family: system-ui, sans-serif;
    margin: 0;
    padding: 1.25rem;
    background: #f0f0f0;
    color: #333;
}

.container {
    max-width: 50rem;
    margin: 0 auto;
    background: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,0.1);
}

header {
    margin: 0 0 1.5rem 0;
    border-bottom: 1px solid #eee;
}

h1 {
    margin: 0 0 0.5rem 0;
}

header p {
    margin: 0 0 1rem 0;
    color: #666;
}

section {
    margin: 0 0 1.5rem 0;
    padding: 1.25rem;
    border: 1px solid #ddd;
    border-radius: 0.25rem;
}

h2 {
    margin: 0 0 1rem 0;
}

.controls-row {
    margin: 0 0 1rem 0;
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

input[type="text"], button {
    font: inherit;
}

input[type="text"] {
    flex-grow: 1;
    padding: 0.5em;
    border: 1px solid #ccc;
    border-radius: 0.25rem;
}

button {
    padding: 0.5em 1em;
    cursor: pointer;
    background: #007bff;
    color: white;
    border: 1px solid #007bff;
    border-radius: 0.25rem;
}

button:hover {
    background: #0056b3;
    border-color: #0056b3;
}

button:disabled {
    background: #ccc;
    border-color: #ccc;
    cursor: not-allowed;
}

/* Chapter 3 Specific */
#audio-status {
    font-size: 0.875rem;
    padding: 0.25em 0.75em;
    border-radius: 1.25rem;
    background: #ffeeba;
    color: #856404;
    border: 1px solid #ffeeba;
}

#audio-status.active {
    background: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}

.terminal {
    background: #000;
    color: #0f0;
    padding: 1rem;
    border-radius: 0.25rem;
    font-family: monospace;
    min-height: 10rem;
    max-height: 20rem;
    overflow-y: auto;
    word-break: break-all;
    white-space: pre-wrap;
    line-height: 1.4;
    margin: 0 0 1rem 0;
}

.visualizer-box {
    width: 100%;
    height: 6rem;
    background: #000;
    border: 1px solid #555;
    border-radius: 0.25rem;
    overflow: hidden;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}