.payment-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999999999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.payment-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
}

.payment-modal-content {
    position: relative;
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    max-width: 90vw;
    max-height: 90vh;
    width: 800px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    will-change: transform;
}

.payment-modal-drag-indicator {
    display: none;
}

.payment-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid #e5e7eb;
}

.payment-modal-title {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: #111827;
}

.payment-modal-close {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: background-color 0.2s;
    color: #6b7280;
}

.payment-modal-close:hover {
    background-color: #f3f4f6;
    color: #111827;
}

.payment-modal-body {
    flex: 1;
    overflow: auto;
    padding: 0;
    position: relative;
}

#payment-iframe-container {
    width: 100%;
    height: 100%;
    min-height: 500px;
}

#payment-iframe-container iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* Mobile: Fullscreen */
@media (max-width: 768px) {
    .payment-modal {
        align-items: flex-end;
    }

    .payment-modal-overlay {
        top: 0;
        will-change: background-color;
    }

    .payment-modal-content {
        max-width: 100vw;
        max-height: 100vh;
        max-height: calc(100vh - env(safe-area-inset-top));
        max-height: calc(100dvh - env(safe-area-inset-top));
        width: 100vw;
        height: 100vh;
        height: calc(100vh - env(safe-area-inset-top));
        height: calc(100dvh - env(safe-area-inset-top));
        border-radius: 12px 12px 0 0;
        padding-bottom: env(safe-area-inset-bottom);
        transform: translate3d(0, 0, 0);
        -webkit-transform: translate3d(0, 0, 0);
        backface-visibility: hidden;
        -webkit-backface-visibility: hidden;
    }

    .payment-modal-content.dragging {
        transition: none;
    }

    .payment-modal-content:not(.dragging) {
        transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
    }

    .payment-modal-drag-indicator {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        cursor: grab;
        padding: 1rem 0;
        touch-action: none;
        -webkit-user-select: none;
        user-select: none;
        flex-shrink: 0;
    }

    .payment-modal-drag-indicator::before {
        content: '';
        display: block;
        width: 40px;
        height: 4px;
        background: #d1d5db;
        border-radius: 2px;
    }

    .payment-modal-drag-indicator:active {
        cursor: grabbing;
    }

    .payment-modal-header {
        display: none;
    }

    .payment-modal-body {
        padding: 0;
        flex: 1;
        overflow: auto;
        min-height: 0;
        -webkit-overflow-scrolling: touch;
    }

    #payment-iframe-container {
        min-height: 100%;
        height: 100%;
    }
}

/* Animation */
.payment-modal.show {
    animation: fadeIn 0.2s ease-out;
}

.payment-modal.show .payment-modal-content {
    animation: slideUp 0.3s ease-out;
}

.disabled-overlay {
    pointer-events: none;
    opacity: 0.5;
    cursor: progress;
    user-select: none;
    -webkit-user-drag: none;
    transition: opacity 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}