:root {
    --primary-color: #4a6bff;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --chat-bg: #ffffff;
    --message-bg: #e9ecef;
    --own-message-bg: #4a6bff;
    --text-color: #212529;
    --own-text-color: #ffffff;
    --border-radius: 12px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background-color);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.chat-container {
    width: 100%;
    max-width: 800px;
    height: 90vh;
    background-color: var(--chat-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #ff4444;
}

.status-indicator.connected {
    background-color: #00ff00;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 70%;
    padding: 1rem;
    border-radius: var(--border-radius);
    word-wrap: break-word;
}

.message.received {
    background-color: var(--message-bg);
    color: var(--text-color);
    align-self: flex-start;
}

.message.sent {
    background-color: var(--own-message-bg);
    color: var(--own-text-color);
    align-self: flex-end;
}

.chat-input-container {
    padding: 1rem;
    background-color: var(--chat-bg);
    border-top: 1px solid #dee2e6;
}

.typing-indicator {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    display: none;
}

.input-wrapper {
    display: flex;
    gap: 0.5rem;
}

input[type="text"] {
    flex: 1;
    padding: 0.8rem;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    outline: none;
    font-size: 1rem;
}

input[type="text"]:focus {
    border-color: var(--primary-color);
}

button {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #3a5bef;
}

button:disabled {
    background-color: var(--secondary-color);
    cursor: not-allowed;
}

.chat-controls {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--chat-bg);
    border-top: 1px solid #dee2e6;
}

.control-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--chat-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.start-btn {
    margin-top: 1rem;
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

@media (max-width: 600px) {
    .chat-container {
        height: 100vh;
        border-radius: 0;
    }
    
    .message {
        max-width: 85%;
    }
}