body {
    font-family: Arial, sans-serif;
    background: #f7f7f7;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 700px;
    margin: 40px auto;
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
}

h1,
h2 {
    margin-top: 0;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"] {
    width: 100%;
    padding: 8px;
    margin: 8px 0;
    box-sizing: border-box;
}

button,
.btn {
    display: inline-block;
    padding: 10px 15px;
    background: #000;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    margin-top: 10px;
}

button:hover,
.btn:hover {
    opacity: 0.9;
}

.error {
    color: #c00;
}

.warning {
    color: #c60;
}

.list {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.list th,
.list td {
    border: 1px solid #ddd;
    padding: 8px;
}

.items {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.items th,
.items td {
    border: 1px solid #eee;
    padding: 6px;
}

.small-btn {
    padding: 4px 8px;
    font-size: 12px;
    background: #999;
}

.total {
    margin-top: 15px;
    font-weight: bold;
}

.footer-link {
    margin-top: 20px;
}

footer {
    margin-top: 40px;
    padding: 20px;
    color: white;
    background: #0f0f0f;
    text-align: center;
}