body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f0f2f5;
    color: #333;
}

.navbar {
    background: #2c3e50;
    color: white;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.navbar strong { font-size: 18px; }
.navbar a { color: #ccc; text-decoration: none; font-size: 14px; }
.navbar a:hover { color: white; }
.navbar .nav-right { margin-left: auto; font-size: 14px; }

.container {
    max-width: 960px;
    margin: 24px auto;
    background: white;
    padding: 24px;
    border-radius: 6px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

h2 { margin-top: 0; color: #2c3e50; }
h3 { color: #2c3e50; }

table { width: 100%; border-collapse: collapse; margin-top: 10px; }
th, td { border: 1px solid #ddd; padding: 9px 12px; text-align: left; font-size: 14px; }
th { background: #2c3e50; color: white; }
tr:nth-child(even) { background: #f9f9f9; }

.btn {
    display: inline-block;
    padding: 8px 18px;
    background: #2c3e50;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    font-size: 14px;
    text-decoration: none;
}
.btn:hover { background: #3d5166; }
.btn-danger { background: #c0392b; }
.btn-danger:hover { background: #e74c3c; }
.btn-sm { padding: 4px 10px; font-size: 12px; }

input[type=text],
input[type=password],
input[type=number],
input[type=email],
select {
    padding: 7px 10px;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 14px;
    margin-bottom: 12px;
}

label { font-size: 14px; font-weight: bold; display: block; margin-bottom: 4px; }
.form-row { margin-bottom: 8px; }

.msg-success { color: green; font-weight: bold; }
.msg-error   { color: #c0392b; font-weight: bold; }
.msg-info    { color: #2980b9; }

.nav-links { margin-bottom: 16px; }
.nav-links a { margin-right: 12px; color: #2c3e50; text-decoration: none; font-size: 14px; }
.nav-links a:hover { text-decoration: underline; }

.receipt-box {
    border: 1px solid #ccc;
    padding: 16px;
    border-radius: 4px;
    background: #fafafa;
    margin-top: 16px;
}