:root {
    --primary: #7341FF;
    --primary-50: #F3F1FF;
    --primary-100: #E9E5FF;
    --primary-200: #D5CFFF;
    --primary-300: #B7A9FF;
    --primary-400: #9478FF;
    --primary-500: #7341FF;
    --primary-600: #631BFF;
    --primary-700: #611BF8;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    --red-100: #FEE2E2;
    --red-300: #FCA5A5;
    --red-500: #EF4444;
    --red-600: #DC2626;
    --blue-50: #EFF6FF;
    --blue-100: #DBEAFE;
}

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

body {
    font-family: 'Open Sans', sans-serif;
    background: linear-gradient(135deg, var(--blue-50) 0%, var(--primary-50) 100%);
    color: var(--gray-700);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.payment-container {
    width: 100%;
    max-width: 520px;
    background: white;
    border-radius: 1.5rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    overflow: hidden;
    position: relative;
}

.payment-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-600) 100%);
    color: white;
    padding: 2rem;
    text-align: center;
    position: relative;
}

    .payment-header::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/><circle cx="10" cy="60" r="0.5" fill="white" opacity="0.1"/><circle cx="90" cy="40" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
        opacity: 0.3;
    }

    .payment-header h1 {
        font-size: 1.875rem;
        font-weight: 700;
        margin-bottom: 0.5rem;
        position: relative;
        z-index: 1;
    }

    .payment-header p {
        opacity: 0.9;
        position: relative;
        z-index: 1;
    }

.payment-content {
    padding: 2rem;
}

.package-selection {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    margin-bottom: 3rem;
    margin-top: 2rem;
}

.package-card {
    border: 2px solid var(--gray-200);
    border-radius: 0.75rem;
    padding: 1.25rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    position: relative;
    background-color: var(--gray-50);
}

    .package-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        border-color: var(--primary-300);
    }

    .package-card.active {
        border-color: var(--primary);
        background-color: var(--primary-50);
        transform: translateY(-3px);
        box-shadow: 0 6px 16px rgba(115, 65, 255, 0.2);
    }

.package-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-600) 100%);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 1rem;
    z-index: 2;
}

.package-name {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.package-price {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.package-credits {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.package-check-icon {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    color: var(--primary);
    font-size: 1.2rem;
    transition: opacity 0.2s;
}

.form-group {
    margin-bottom: 1.25rem;
    position: relative;
}

.form-label {
    display: block;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.validity-notice-wrapper {
    text-align: center;
    margin-top: -1rem;
    margin-bottom: 1.5rem;
}

.validity-notice {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--primary-50);
    color: var(--primary-700);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    border: 1px solid var(--primary-100);
}

    .validity-notice i {
        font-size: 0.9rem;
    }

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-200);
    border-radius: 0.75rem;
    font-size: 0.875rem;
    transition: all 0.2s;
    background-color: var(--gray-50);
}

    .form-input:focus {
        outline: none;
        border-color: var(--primary);
        background-color: white;
        box-shadow: 0 0 0 3px var(--primary-100);
    }

    .form-input:hover {
        border-color: var(--primary-300);
    }

    .form-input.error {
        border-color: var(--red-500);
        background-color: var(--red-100);
    }

        .form-input.error:focus {
            border-color: var(--red-600);
            box-shadow: 0 0 0 3px var(--red-300);
        }

.error-message {
    color: var(--red-600);
    font-size: 0.75rem;
    margin-top: 0.25rem;
    display: none;
}

.input-group {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    transition: color 0.2s;
}

.input-group .form-input {
    padding-left: 2.75rem;
}

.input-group:focus-within .input-icon {
    color: var(--primary);
}

.payment-details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.5rem;
    font-weight: 600;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-size: 1rem;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-600) 100%);
    color: white;
    width: 100%;
    box-shadow: 0 4px 14px 0 rgba(115, 65, 255, 0.3);
}

    .btn-primary:hover {
        transform: translateY(-1px);
        box-shadow: 0 6px 20px 0 rgba(115, 65, 255, 0.4);
    }

    .btn-primary:active {
        transform: translateY(0);
    }

    .btn-primary:disabled {
        opacity: 0.6;
        cursor: not-allowed;
        transform: none !important;
    }

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.75rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.secure-payment-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--gray-500);
    font-size: 0.875rem;
}

    .secure-payment-footer .lock-icon {
        vertical-align: middle;
        margin-right: 0.25rem;
    }

@media (max-width: 640px) {
    .payment-container {
        margin: 0.5rem;
        border-radius: 1rem;
    }

    .payment-header {
        padding: 1.5rem;
    }

        .payment-header h1 {
            font-size: 1.5rem;
        }

    .payment-content {
        padding: 1.5rem;
    }

    .package-selection {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
}