body {
    font-family: Arial, sans-serif;
    background: #111827;
    color: white;
    display: flex;
    justify-content: center;
    padding-top: 50px;
}

.container {
    background: #1f2937;
    padding: 30px;
    border-radius: 10px;
    width: 500px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.input-group, .filter-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

input, button {
    padding: 10px;
    border-radius: 5px;
    border: none;
}

button {
    cursor: pointer;
}

button.delete {
    background: #ef4444;
    color: white;
}

button.delete-all {
    background: #b91c1c;
    color: white;
}

#addBtn, #filterBtn {
    background: #6366f1;
    color: white;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px;
    border-bottom: 1px solid #9ca3af;
}

.empty {
    text-align: center;
    color: #9ca3af;
}