:root {
    --vale-color: #880e4f; /* Koyu Bordo */
    --background-light: #f9f9f9;
    --primary-text: #333;
    --secondary-text: #666;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    background-color: #e6edf2;
}

.app-container {
    width: 100%;
    max-width: 450px; /* Mobil ekran genişliği */
    min-height: 100vh;
    background-color: #fff;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
}

header {
    display: flex;
    align-items: center;
    padding: 15px;
    background-color: var(--vale-color);
    color: white;
}

header h1 {
    font-size: 18px;
    margin: 0 auto; /* Başlığı ortalar */
    font-weight: bold;
}

.menu-icon {
    font-size: 24px;
}

.vale-focus {
    padding: 20px;
    flex-grow: 1;
}

.form-title {
    text-align: center;
    color: var(--vale-color);
    margin-bottom: 25px;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 5px;
    color: var(--primary-text);
}

.input-group input {
    width: calc(100% - 20px);
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
}

.result-area {
    background-color: var(--background-light);
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    margin-bottom: 20px;
}

.result-area p {
    margin: 5px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--secondary-text);
}

#ucret_gosterim {
    font-size: 20px;
    color: var(--vale-color);
    font-weight: bold;
    margin-top: 10px;
}

button {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    margin-bottom: 10px;
    transition: background-color 0.3s;
}

#hesapla_butonu {
    background-color: var(--vale-color);
    color: white;
}

#hesapla_butonu:hover {
    background-color: #b71c1c;
}

#odeme_yap_butonu {
    background-color: #008000; /* Yeşil */
    color: white;
}

#odeme_yap_butonu:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

footer {
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    background-color: #f0f0f0;
    border-top: 1px solid #eee;
}

.footer-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 12px;
    color: var(--secondary-text);
    padding: 5px;
}

.footer-item.active {
    color: var(--vale-color);
    font-weight: bold;
}

.footer-item i {
    font-size: 20px;
    margin-bottom: 3px;
}