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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #0a0a0a;
    color: #e0e0e0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    max-width: 600px;
    padding: 2rem;
    text-align: center;
}

header {
    margin-bottom: 3rem;
}

h1 {
    font-size: 3rem;
    font-weight: 200;
    letter-spacing: 0.3em;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1rem;
    font-weight: 300;
    color: #888;
    margin-bottom: 1rem;
}

.ornot {
    font-style: italic;
    color: #555;
    font-size: 0.9rem;
}

.intro {
    margin-bottom: 2rem;
    color: #999;
    font-size: 0.95rem;
    line-height: 1.6;
}

.player {
    background: #111;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.transport {
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.play-btn {
    background: #222;
    color: #e0e0e0;
    border: 1px solid #333;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.play-btn:hover {
    background: #2a2a2a;
    border-color: #444;
}

.play-btn.playing {
    background: #1a3a1a;
    border-color: #2a5a2a;
}

#status {
    color: #666;
    font-size: 0.85rem;
}

.tracks {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.track {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #1a1a1a;
    padding: 1rem 1.25rem;
    border-radius: 8px;
    transition: all 0.3s;
}

.track.muted {
    opacity: 0.3;
    background: #0d0d0d;
}

.track-name {
    font-size: 0.95rem;
    font-weight: 400;
}

.track-toggle {
    background: none;
    border: 1px solid #333;
    color: #888;
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.track-toggle:hover {
    border-color: #555;
    color: #aaa;
}

.track.muted .track-toggle {
    border-color: #553333;
    color: #aa6666;
}

.message {
    margin-top: 1.5rem;
    min-height: 3rem;
}

.message p {
    color: #777;
    font-style: italic;
    font-size: 0.9rem;
    line-height: 1.5;
}

.teaching {
    margin-bottom: 2rem;
}

.insight {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.8;
}

.equation {
    color: #444;
    font-size: 0.85rem;
}

.equation p {
    margin-bottom: 0.5rem;
}

.equation .small {
    font-size: 0.75rem;
    color: #333;
}

footer {
    margin-top: 3rem;
}

.epsilon {
    color: #333;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.apple {
    font-size: 1.5rem;
    opacity: 0.5;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message p {
    animation: fadeIn 0.5s ease-out;
}