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

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* Container Styles */
.container {
    width: 100%;
    max-width: 500px;
}

.login-box,
.payment-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 100%;
}

/* Typography */
h2 {
    color: #0066cc;
    text-align: center;
    margin-bottom: 15px;
}

/* Input Styles */
.input-group {
    margin-bottom: 15px;
    position: relative;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    color: #333;
    font-size: 0.9em;
}

.input-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
}

.toggle-password {
    position: absolute;
    right: 10px;
    top: 35px;
    cursor: pointer;
}

/* Button Styles */
.login-btn,
.pay-button {
    width: 100%;
    padding: 12px;
    background-color: #0066cc;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1em;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.login-btn:hover,
.pay-button:hover {
    background-color: #0052a3;
}

/* Login Page Specific Styles */
.login-options {
    display: flex;
    margin-bottom: 20px;
}

.tab-btn {
    flex: 1;
    padding: 10px;
    background-color: #f4f4f4;
    border: none;
    color: #666;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background-color: #0066cc;
    color: white;
}

.links {
    display: flex;
    justify-content: space-between;
    margin-top: 15px;
}

.links a {
    color: #0066cc;
    text-decoration: none;
    font-size: 0.9em;
}

/* QR Code Section */
.qr-section {
    text-align: center;
    margin-top: 20px;
    border-top: 1px solid #eee;
    padding-top: 20px;
}

.qr-placeholder {
    width: 150px;
    height: 150px;
    background-color: #f4f4f4;
    margin: 20px auto;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 10px;
}

.qr-info span {
    color: #666;
    font-size: 0.9em;
}

/* Payment Page Styles */
.payment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 15px;
}

.payment-header img {
    max-height: 40px;
}

.payment-amount {
    font-size: 1.5em;
    font-weight: bold;
    color: #0066cc;
}

.card-brands {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.card-brands img {
    height: 30px;
    opacity: 0.6;
}

.card-brands img.active {
    opacity: 1;
}

.card-details {
    display: flex;
    gap: 10px;
}

.save-card-option {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.save-card-option input {
    margin-right: 10px;
}

.payment-note {
    text-align: center;
    color: #666;
    font-size: 0.8em;
    margin-top: 15px;
}

.back-link {
    display: block;
    text-align: center;
    color: #0066cc;
    text-decoration: none;
    margin-top: 15px;
}

/* Responsive Adjustments */
@media (max-width: 480px) {
    .login-box,
    .payment-container {
        padding: 20px;
    }

    .card-details {
        flex-direction: column;
    }

    .login-options {
        flex-direction: column;
    }

    .tab-btn {
        margin-bottom: 10px;
    }
}

/* Accessibility and Focus States */
input:focus,
button:focus {
    outline: 2px solid #0066cc;
    outline-offset: 2px;
}

/* Error and Validation Styles */
input:invalid {
    border-color: #ff4136;
}