:root {
    --primary-color: #3498db;
    --secondary-color: #2980b9;
    --background-color: #f0f3f5;
    --text-color: #34495e;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --message-bg-user: #3498db;
    --message-bg-assistant: #ecf0f1;
}

body {
    font-family: 'Vazirmatn', 'Tahoma', Arial, sans-serif;
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: var(--text-color);
}

#chat-container {
    width: 95%;
    max-width: 1200px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 90vh;
}

#chat-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    font-size: 28px;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px var(--shadow-color);
    text-align: center;
}

.header-title {
    flex-grow: 1;
    text-align: center;
}

.header-icons {
    display: flex;
    gap: 15px;
}

.header-icon {
    cursor: pointer;
    font-size: 24px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.header-icon:hover {
    transform: scale(1.1);
    opacity: 0.8;
}

#chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.message {
    max-width: 75%;
    padding: 15px 20px;
    border-radius: 20px;
    box-shadow: 0 3px 15px var(--shadow-color);
    font-size: 16px;
    line-height: 1.6;
    transition: transform 0.3s ease;
}

.message:hover {
    transform: translateY(-2px);
}

.user-message {
    align-self: flex-end;
    background-color: var(--message-bg-user);
    color: white;
}

.assistant-message {
    align-self: flex-start;
    background-color: var(--message-bg-assistant);
    border: 1px solid var(--secondary-color);
    color: var(--text-color);
}

#input-container {
    display: flex;
    padding: 20px;
    background: white;
    border-top: 1px solid var(--secondary-color);
    gap: 10px;
}

#user-input {
    flex-grow: 1;
    padding: 15px 25px;
    border: 2px solid var(--secondary-color);
    border-radius: 30px;
    font-size: 16px;
    font-family: 'Vazirmatn', 'Tahoma', Arial, sans-serif;
    background: white;
    transition: all 0.3s ease;
}

#user-input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.3);
}

.input-button {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 55px;
    height: 55px;
    font-size: 22px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
    box-shadow: 0 3px 15px var(--shadow-color);
}

.input-button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

@media (max-width: 768px) {
    #chat-container {
        width: 100%;
        height: 100vh;
        border-radius: 0;
    }

    #chat-header {
        font-size: 24px;
        padding: 15px;
    }

    .message {
        max-width: 85%;
    }
}