* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background: #f0f2f5;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 30px auto;
    padding: 20px;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 24px;
}

h2 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 20px;
}

.kart {
    background: white;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

input[type="text"],
input[type="number"],
input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 12px;
}

button, .btn {
    width: 100%;
    padding: 14px;
    background: #27ae60;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    text-decoration: none;
    display: block;
    text-align: center;
    margin-bottom: 10px;
}

button:hover, .btn:hover {
    background: #219a52;
}

.btn-mavi {
    background: #2980b9;
}

.btn-mavi:hover {
    background: #2471a3;
}

.btn-kirmizi {
    background: #e74c3c;
}

.btn-kirmizi:hover {
    background: #c0392b;
}

.urun-satir {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-bottom: 1px solid #eee;
    font-size: 16px;
}

.urun-satir:last-child {
    border-bottom: none;
}

.ucuz {
    background: #d5f5e3;
    border-radius: 8px;
    padding: 2px 8px;
    color: #1e8449;
    font-weight: bold;
}

.pahal {
    color: #999;
}

.hata {
    background: #fde8e8;
    color: #e74c3c;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 12px;
    text-align: center;
}

.basari {
    background: #d5f5e3;
    color: #1e8449;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 12px;
    text-align: center;
}

.etiket {
    font-size: 14px;
    color: #666;
    margin-bottom: 5px;
}