* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background: #0f0f0f;
    color: #e8e8e8;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

button {
    background: #1e1e1e;
    color: #ccc;
    border: 1px solid #333;
    padding: 7px 14px;
    border-radius: 6px;
    font-size: 0.8125rem;
    cursor: pointer;
    transition: background 0.15s;
}

button:hover { background: #2a2a2a; }

button.primary {
    background: #2563eb;
    color: white;
    border-color: #2563eb;
}

button.primary:hover { background: #1d4ed8; }

button.active {
    background: #2563eb;
    color: white;
    border-color: #2563eb;
}

button.danger {
    background: #dc2626;
    color: white;
    border-color: #dc2626;
}

button.danger:hover { background: #b91c1c; }