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

body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
}

.screen {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    min-height: 500px;
}

.hidden {
    display: none !important;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
    margin-bottom: 20px;
}

h2 {
    color: #2c3e50;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"] {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background-color: #2980b9;
}

#logoutBtn, #adminLogoutBtn {
    background-color: #e74c3c;
}

#logoutBtn:hover, #adminLogoutBtn:hover {
    background-color: #c0392b;
}

.error-message {
    color: #e74c3c;
    margin-top: 10px;
    font-weight: bold;
}

.message {
    color: #27ae60;
    margin-top: 10px;
    font-weight: bold;
}

.sale-item {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 4px;
    padding: 10px;
    margin: 10px 0;
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.sale-item h4 {
    color: #2c3e50;
    margin-bottom: 5px;
}

.sale-details {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.sale-detail {
    font-size: 14px;
}