.app-modal {
    display: none;
}

.modal-content {
    opacity: 0;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1),
                0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    transform: translateY(50px);
    transition-duration: 0.4s;
    transition-timing-function: cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.app-modal.active .modal-content {
    opacity: 1;
    transform: translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.close-btn {
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 50%;
    background: #f1f5f9;
    color: #64748b;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background: #e2e8f0;
    transform: rotate(90deg);
}

.app-intro {
    color: #475569;
    line-height: 1.6;
}

.app-intro h3 {
    margin: 0 0 1rem;
    color: #1e293b;
    font-size: 1.1rem;
    font-weight: 600;
}

.app-intro ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.app-intro li {
    margin-bottom: 0.5rem;
    color: #475569;
}

@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: 20px;
    }
}