body {
    background-color: #f8f9fa;
    font-family: 'Vazirmatn', 'Tahoma', sans-serif; /* اضافه کردن فونت‌های جایگزین */
}
.container {
    max-width: 1000px;
}
.alert {
    text-align: center;
}
form {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.chat-container {
    display: flex;
    flex-direction: row;
    gap: 20px;
}
.chat-list {
    flex: 1;
    max-height: 500px;
    overflow-y: auto;
    padding: 10px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.chat-form {
    flex: 1;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.message {
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 5px;
    background: #f1f1f1;
}
.message.sent {
    background: #d4edda;
}
.message.received {
    background: #e9ecef;
}
.navbar {
    background: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 50px 20px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}
.hero-section h1 {
    font-size: 3rem;
    font-weight: bold;
    color: #2c3e50;
}
.hero-section p {
    font-size: 1.2rem;
    color: #34495e;
    margin: 20px 0;
}
.btn-cta {
    padding: 12px 30px;
    font-size: 1.1rem;
    border-radius: 25px;
}
.navbar-brand img {
    height: 40px;
}
.features {
    padding: 50px 0;
    background: #fff;
}
.feature-card {
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}
.feature-card:hover {
    transform: translateY(-5px);
}
footer {
    background: #2c3e50;
    color: #fff;
    padding: 20px 0;
    text-align: center;
}
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    .hero-section p {
        font-size: 1rem;
    }
    .chat-container {
        flex-direction: column;
    }
}