.chat-thread-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    background-color: #f8f9fa;
}

.chat-header {
    background: white;
    border-bottom: 1px solid #e9ecef;
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.chat-thread-container .header-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.back-button {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.back-button:hover {
    background-color: #f8f9fa;
}

.back-icon {
    color: #6c757d;
}

.chat-title h2 {
    margin: 0;
    color: #333;
    font-size: 1.25rem;
    font-weight: 600;
}

.participants-container {
    margin-top: 0.5rem;
}

.participants-list {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.participant-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.participant-letter {
    font-weight: bold;
    font-size: 1rem;
}

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

.chat-thread-container .loading-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #6c757d;
}

.chat-thread-container .spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.no-messages {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: #6c757d;
    padding: 2rem;
}

.messages-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-thread-container .message-item {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.message-item.own-message {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.message-letter {
    font-weight: bold;
    font-size: 1rem;
}

.chat-thread-container .message-content {
    background: white;
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    max-width: 70%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.message-text {
    color: #333;
    margin-bottom: 0.25rem;
    word-wrap: break-word;
}

.message-time {
    font-size: 0.75rem;
    color: #6c757d;
}

.input-container {
    background: white;
    border-top: 1px solid #e9ecef;
    padding: 1rem;
}

.chat-input-container {
    width: 100%;
}

.chat-input-frame {
    background: #f8f9fa;
    border-radius: 25px;
    padding: 0.75rem 1rem;
    border: 1px solid #e9ecef;
}

.chat-input-grid {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.chat-text-input {
    flex: 1;
    border: none;
    background: transparent;
    outline: none;
    font-size: 1rem;
    color: #333;
}

.chat-text-input::placeholder {
    color: #6c757d;
}

.chat-send-button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: #007bff;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.chat-send-button:hover:not(:disabled) {
    background: #0056b3;
}

.chat-send-button:disabled {
    background: #6c757d;
    cursor: not-allowed;
}

.send-icon {
    font-size: 1rem;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .chat-header {
        padding: 0.75rem;
    }
    
    .chat-thread-container .header-content {
        gap: 0.75rem;
        margin-bottom: 0.75rem;
    }

    .chat-title h2 {
        font-size: 1.1rem;
    }

    .chat-thread-container .messages-container {
        padding: 0.75rem;
    }

    .chat-thread-container .message-content {
        max-width: 85%;
    }
    
    .input-container {
        padding: 0.75rem;
    }
    
    .chat-input-frame {
        padding: 0.5rem 0.75rem;
    }
}

@media (max-width: 480px) {
    .chat-header {
        padding: 0.5rem;
    }
    
    .chat-thread-container .header-content {
        gap: 0.5rem;
        margin-bottom: 0.5rem;
    }

    .chat-title h2 {
        font-size: 1rem;
    }

    .chat-thread-container .messages-container {
        padding: 0.5rem;
    }

    .chat-thread-container .message-content {
        max-width: 90%;
        padding: 0.5rem 0.75rem;
    }
    
    .input-container {
        padding: 0.5rem;
    }
    
    .chat-input-frame {
        padding: 0.5rem;
    }
    
    .participant-avatar,
    .message-avatar {
        width: 35px;
        height: 35px;
    }
    
    .participant-letter,
    .message-letter {
        font-size: 0.9rem;
    }
}

/* Message Loading Indicator */
.message-loading-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    color: #6c757d;
    font-size: 0.9rem;
    font-weight: 500;
    background-color: #f8f9fa;
    border-radius: 8px;
    margin: 0.5rem 1rem;
    border: 1px solid #e9ecef;
}

/* Message Sending Indicator */
.message-sending-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    color: #007bff;
    font-size: 0.85rem;
    font-weight: 500;
    background-color: #e3f2fd;
    border-radius: 8px;
    margin: 0.5rem 1rem;
    border: 1px solid #bbdefb;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

.message-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid #e9ecef;
    border-top: 2px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}