* {
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    margin: 0;
    background: #f0f0f0;
    color: #000;
    font-size: 18px;
}

/* HEADER */
header {
    background: #111;
    color: white;
    padding: 1rem;
    text-align: center;
}

header a {
    color: #fff;
    font-size: 18px;
    display: inline-block;
    margin-top: 0.5rem;
}

/* LAYOUT */
.container {
    padding: 1rem;
}

/* FORM */
form {
    background: white;
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 6px;
}

form h3 {
    margin-top: 0;
    font-size: 22px;
}

input,
button {
    width: 100%;
    font-size: 18px;
    padding: 14px;
    margin-top: 10px;
}

input[type="checkbox"] {
    width: 24px;
    height: 24px;
}

label {
    font-size: 18px;
}

button {
    background: #007aff;
    color: white;
    border: none;
    border-radius: 6px;
}

/* ITEMS */
.item {
    background: white;
    margin-bottom: 1.5rem;
    border-radius: 6px;
    overflow: hidden;
}

.item img {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
}

.item-content {
    padding: 1rem;
}

.item-content h3 {
    font-size: 22px;
    margin: 0 0 0.5rem 0;
}

.status {
    font-size: 18px;
    margin-bottom: 0.8rem;
}

.available {
    color: green;
}

.unavailable {
    color: red;
}

.actions a {
    display: block;
    background: #eee;
    padding: 14px;
    margin-top: 10px;
    text-align: center;
    border-radius: 6px;
    font-size: 18px;
    color: black;
}

/* DESKTOP */
@media (min-width: 800px) {
    .container {
        max-width: 900px;
        margin: auto;
    }
}

.status.sold {
    color: darkred;
    font-weight: bold;
}

.error {
    color: red;
    font-weight: bold;
    margin-top: 1rem;
    font-size: 22px;
    text-align: center;
}